Index: frontend/node_modules/esquery/README.md
===================================================================
--- frontend/node_modules/esquery/README.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/README.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,27 @@
+ESQuery is a library for querying the AST output by Esprima for patterns of syntax using a CSS style selector system. Check out the demo:
+
+[demo](https://estools.github.io/esquery/)
+
+The following selectors are supported:
+* AST node type: `ForStatement`
+* [wildcard](http://dev.w3.org/csswg/selectors4/#universal-selector): `*`
+* [attribute existence](http://dev.w3.org/csswg/selectors4/#attribute-selectors): `[attr]`
+* [attribute value](http://dev.w3.org/csswg/selectors4/#attribute-selectors): `[attr="foo"]` or `[attr=123]`
+* attribute regex: `[attr=/foo.*/]` or (with flags) `[attr=/foo.*/is]`
+* attribute conditions: `[attr!="foo"]`, `[attr>2]`, `[attr<3]`, `[attr>=2]`, or `[attr<=3]`
+* nested attribute: `[attr.level2="foo"]`
+* field: `FunctionDeclaration > Identifier.id`
+* [First](http://dev.w3.org/csswg/selectors4/#the-first-child-pseudo) or [last](http://dev.w3.org/csswg/selectors4/#the-last-child-pseudo) child: `:first-child` or `:last-child`
+* [nth-child](http://dev.w3.org/csswg/selectors4/#the-nth-child-pseudo) (no ax+b support): `:nth-child(2)`
+* [nth-last-child](http://dev.w3.org/csswg/selectors4/#the-nth-last-child-pseudo) (no ax+b support): `:nth-last-child(1)`
+* [descendant](http://dev.w3.org/csswg/selectors4/#descendant-combinators): `ancestor descendant`
+* [child](http://dev.w3.org/csswg/selectors4/#child-combinators): `parent > child`
+* [following sibling](http://dev.w3.org/csswg/selectors4/#general-sibling-combinators): `node ~ sibling`
+* [adjacent sibling](http://dev.w3.org/csswg/selectors4/#adjacent-sibling-combinators): `node + adjacent`
+* [negation](http://dev.w3.org/csswg/selectors4/#negation-pseudo): `:not(ForStatement)`
+* [has](https://drafts.csswg.org/selectors-4/#has-pseudo): `:has(ForStatement)`, `:has(> ForStatement)`
+* [matches-any](http://dev.w3.org/csswg/selectors4/#matches): `:is([attr] > :first-child, :last-child)`
+* [subject indicator](http://dev.w3.org/csswg/selectors4/#subject): `!IfStatement > [name="foo"]`
+* class of AST node: `:statement`, `:expression`, `:declaration`, `:function`, or `:pattern`
+
+[![Build Status](https://travis-ci.org/estools/esquery.png?branch=master)](https://travis-ci.org/estools/esquery)
Index: frontend/node_modules/esquery/dist/esquery.esm.js
===================================================================
--- frontend/node_modules/esquery/dist/esquery.esm.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/dist/esquery.esm.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,4418 @@
+function _arrayLikeToArray(r, a) {
+  (null == a || a > r.length) && (a = r.length);
+  for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e];
+  return n;
+}
+function _arrayWithHoles(r) {
+  if (Array.isArray(r)) return r;
+}
+function _arrayWithoutHoles(r) {
+  if (Array.isArray(r)) return _arrayLikeToArray(r);
+}
+function _iterableToArray(r) {
+  if ("undefined" != typeof Symbol && null != r[Symbol.iterator] || null != r["@@iterator"]) return Array.from(r);
+}
+function _iterableToArrayLimit(r, l) {
+  var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"];
+  if (null != t) {
+    var e,
+      n,
+      i,
+      u,
+      a = [],
+      f = !0,
+      o = !1;
+    try {
+      if (i = (t = t.call(r)).next, 0 === l) {
+        if (Object(t) !== t) return;
+        f = !1;
+      } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0);
+    } catch (r) {
+      o = !0, n = r;
+    } finally {
+      try {
+        if (!f && null != t.return && (u = t.return(), Object(u) !== u)) return;
+      } finally {
+        if (o) throw n;
+      }
+    }
+    return a;
+  }
+}
+function _nonIterableRest() {
+  throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+}
+function _nonIterableSpread() {
+  throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+}
+function _slicedToArray(r, e) {
+  return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _nonIterableRest();
+}
+function _toConsumableArray(r) {
+  return _arrayWithoutHoles(r) || _iterableToArray(r) || _unsupportedIterableToArray(r) || _nonIterableSpread();
+}
+function _typeof(o) {
+  "@babel/helpers - typeof";
+
+  return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) {
+    return typeof o;
+  } : function (o) {
+    return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o;
+  }, _typeof(o);
+}
+function _unsupportedIterableToArray(r, a) {
+  if (r) {
+    if ("string" == typeof r) return _arrayLikeToArray(r, a);
+    var t = {}.toString.call(r).slice(8, -1);
+    return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0;
+  }
+}
+
+var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};
+
+function createCommonjsModule(fn, module) {
+	return module = { exports: {} }, fn(module, module.exports), module.exports;
+}
+
+var estraverse = createCommonjsModule(function (module, exports) {
+  /*
+    Copyright (C) 2012-2013 Yusuke Suzuki <utatane.tea@gmail.com>
+    Copyright (C) 2012 Ariya Hidayat <ariya.hidayat@gmail.com>
+  
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+  
+      * Redistributions of source code must retain the above copyright
+        notice, this list of conditions and the following disclaimer.
+      * Redistributions in binary form must reproduce the above copyright
+        notice, this list of conditions and the following disclaimer in the
+        documentation and/or other materials provided with the distribution.
+  
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+    ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  */
+  /*jslint vars:false, bitwise:true*/
+  /*jshint indent:4*/
+  /*global exports:true*/
+  (function clone(exports) {
+
+    var Syntax, VisitorOption, VisitorKeys, BREAK, SKIP, REMOVE;
+    function deepCopy(obj) {
+      var ret = {},
+        key,
+        val;
+      for (key in obj) {
+        if (obj.hasOwnProperty(key)) {
+          val = obj[key];
+          if (typeof val === 'object' && val !== null) {
+            ret[key] = deepCopy(val);
+          } else {
+            ret[key] = val;
+          }
+        }
+      }
+      return ret;
+    }
+
+    // based on LLVM libc++ upper_bound / lower_bound
+    // MIT License
+
+    function upperBound(array, func) {
+      var diff, len, i, current;
+      len = array.length;
+      i = 0;
+      while (len) {
+        diff = len >>> 1;
+        current = i + diff;
+        if (func(array[current])) {
+          len = diff;
+        } else {
+          i = current + 1;
+          len -= diff + 1;
+        }
+      }
+      return i;
+    }
+    Syntax = {
+      AssignmentExpression: 'AssignmentExpression',
+      AssignmentPattern: 'AssignmentPattern',
+      ArrayExpression: 'ArrayExpression',
+      ArrayPattern: 'ArrayPattern',
+      ArrowFunctionExpression: 'ArrowFunctionExpression',
+      AwaitExpression: 'AwaitExpression',
+      // CAUTION: It's deferred to ES7.
+      BlockStatement: 'BlockStatement',
+      BinaryExpression: 'BinaryExpression',
+      BreakStatement: 'BreakStatement',
+      CallExpression: 'CallExpression',
+      CatchClause: 'CatchClause',
+      ChainExpression: 'ChainExpression',
+      ClassBody: 'ClassBody',
+      ClassDeclaration: 'ClassDeclaration',
+      ClassExpression: 'ClassExpression',
+      ComprehensionBlock: 'ComprehensionBlock',
+      // CAUTION: It's deferred to ES7.
+      ComprehensionExpression: 'ComprehensionExpression',
+      // CAUTION: It's deferred to ES7.
+      ConditionalExpression: 'ConditionalExpression',
+      ContinueStatement: 'ContinueStatement',
+      DebuggerStatement: 'DebuggerStatement',
+      DirectiveStatement: 'DirectiveStatement',
+      DoWhileStatement: 'DoWhileStatement',
+      EmptyStatement: 'EmptyStatement',
+      ExportAllDeclaration: 'ExportAllDeclaration',
+      ExportDefaultDeclaration: 'ExportDefaultDeclaration',
+      ExportNamedDeclaration: 'ExportNamedDeclaration',
+      ExportSpecifier: 'ExportSpecifier',
+      ExpressionStatement: 'ExpressionStatement',
+      ForStatement: 'ForStatement',
+      ForInStatement: 'ForInStatement',
+      ForOfStatement: 'ForOfStatement',
+      FunctionDeclaration: 'FunctionDeclaration',
+      FunctionExpression: 'FunctionExpression',
+      GeneratorExpression: 'GeneratorExpression',
+      // CAUTION: It's deferred to ES7.
+      Identifier: 'Identifier',
+      IfStatement: 'IfStatement',
+      ImportExpression: 'ImportExpression',
+      ImportDeclaration: 'ImportDeclaration',
+      ImportDefaultSpecifier: 'ImportDefaultSpecifier',
+      ImportNamespaceSpecifier: 'ImportNamespaceSpecifier',
+      ImportSpecifier: 'ImportSpecifier',
+      Literal: 'Literal',
+      LabeledStatement: 'LabeledStatement',
+      LogicalExpression: 'LogicalExpression',
+      MemberExpression: 'MemberExpression',
+      MetaProperty: 'MetaProperty',
+      MethodDefinition: 'MethodDefinition',
+      ModuleSpecifier: 'ModuleSpecifier',
+      NewExpression: 'NewExpression',
+      ObjectExpression: 'ObjectExpression',
+      ObjectPattern: 'ObjectPattern',
+      PrivateIdentifier: 'PrivateIdentifier',
+      Program: 'Program',
+      Property: 'Property',
+      PropertyDefinition: 'PropertyDefinition',
+      RestElement: 'RestElement',
+      ReturnStatement: 'ReturnStatement',
+      SequenceExpression: 'SequenceExpression',
+      SpreadElement: 'SpreadElement',
+      Super: 'Super',
+      SwitchStatement: 'SwitchStatement',
+      SwitchCase: 'SwitchCase',
+      TaggedTemplateExpression: 'TaggedTemplateExpression',
+      TemplateElement: 'TemplateElement',
+      TemplateLiteral: 'TemplateLiteral',
+      ThisExpression: 'ThisExpression',
+      ThrowStatement: 'ThrowStatement',
+      TryStatement: 'TryStatement',
+      UnaryExpression: 'UnaryExpression',
+      UpdateExpression: 'UpdateExpression',
+      VariableDeclaration: 'VariableDeclaration',
+      VariableDeclarator: 'VariableDeclarator',
+      WhileStatement: 'WhileStatement',
+      WithStatement: 'WithStatement',
+      YieldExpression: 'YieldExpression'
+    };
+    VisitorKeys = {
+      AssignmentExpression: ['left', 'right'],
+      AssignmentPattern: ['left', 'right'],
+      ArrayExpression: ['elements'],
+      ArrayPattern: ['elements'],
+      ArrowFunctionExpression: ['params', 'body'],
+      AwaitExpression: ['argument'],
+      // CAUTION: It's deferred to ES7.
+      BlockStatement: ['body'],
+      BinaryExpression: ['left', 'right'],
+      BreakStatement: ['label'],
+      CallExpression: ['callee', 'arguments'],
+      CatchClause: ['param', 'body'],
+      ChainExpression: ['expression'],
+      ClassBody: ['body'],
+      ClassDeclaration: ['id', 'superClass', 'body'],
+      ClassExpression: ['id', 'superClass', 'body'],
+      ComprehensionBlock: ['left', 'right'],
+      // CAUTION: It's deferred to ES7.
+      ComprehensionExpression: ['blocks', 'filter', 'body'],
+      // CAUTION: It's deferred to ES7.
+      ConditionalExpression: ['test', 'consequent', 'alternate'],
+      ContinueStatement: ['label'],
+      DebuggerStatement: [],
+      DirectiveStatement: [],
+      DoWhileStatement: ['body', 'test'],
+      EmptyStatement: [],
+      ExportAllDeclaration: ['source'],
+      ExportDefaultDeclaration: ['declaration'],
+      ExportNamedDeclaration: ['declaration', 'specifiers', 'source'],
+      ExportSpecifier: ['exported', 'local'],
+      ExpressionStatement: ['expression'],
+      ForStatement: ['init', 'test', 'update', 'body'],
+      ForInStatement: ['left', 'right', 'body'],
+      ForOfStatement: ['left', 'right', 'body'],
+      FunctionDeclaration: ['id', 'params', 'body'],
+      FunctionExpression: ['id', 'params', 'body'],
+      GeneratorExpression: ['blocks', 'filter', 'body'],
+      // CAUTION: It's deferred to ES7.
+      Identifier: [],
+      IfStatement: ['test', 'consequent', 'alternate'],
+      ImportExpression: ['source'],
+      ImportDeclaration: ['specifiers', 'source'],
+      ImportDefaultSpecifier: ['local'],
+      ImportNamespaceSpecifier: ['local'],
+      ImportSpecifier: ['imported', 'local'],
+      Literal: [],
+      LabeledStatement: ['label', 'body'],
+      LogicalExpression: ['left', 'right'],
+      MemberExpression: ['object', 'property'],
+      MetaProperty: ['meta', 'property'],
+      MethodDefinition: ['key', 'value'],
+      ModuleSpecifier: [],
+      NewExpression: ['callee', 'arguments'],
+      ObjectExpression: ['properties'],
+      ObjectPattern: ['properties'],
+      PrivateIdentifier: [],
+      Program: ['body'],
+      Property: ['key', 'value'],
+      PropertyDefinition: ['key', 'value'],
+      RestElement: ['argument'],
+      ReturnStatement: ['argument'],
+      SequenceExpression: ['expressions'],
+      SpreadElement: ['argument'],
+      Super: [],
+      SwitchStatement: ['discriminant', 'cases'],
+      SwitchCase: ['test', 'consequent'],
+      TaggedTemplateExpression: ['tag', 'quasi'],
+      TemplateElement: [],
+      TemplateLiteral: ['quasis', 'expressions'],
+      ThisExpression: [],
+      ThrowStatement: ['argument'],
+      TryStatement: ['block', 'handler', 'finalizer'],
+      UnaryExpression: ['argument'],
+      UpdateExpression: ['argument'],
+      VariableDeclaration: ['declarations'],
+      VariableDeclarator: ['id', 'init'],
+      WhileStatement: ['test', 'body'],
+      WithStatement: ['object', 'body'],
+      YieldExpression: ['argument']
+    };
+
+    // unique id
+    BREAK = {};
+    SKIP = {};
+    REMOVE = {};
+    VisitorOption = {
+      Break: BREAK,
+      Skip: SKIP,
+      Remove: REMOVE
+    };
+    function Reference(parent, key) {
+      this.parent = parent;
+      this.key = key;
+    }
+    Reference.prototype.replace = function replace(node) {
+      this.parent[this.key] = node;
+    };
+    Reference.prototype.remove = function remove() {
+      if (Array.isArray(this.parent)) {
+        this.parent.splice(this.key, 1);
+        return true;
+      } else {
+        this.replace(null);
+        return false;
+      }
+    };
+    function Element(node, path, wrap, ref) {
+      this.node = node;
+      this.path = path;
+      this.wrap = wrap;
+      this.ref = ref;
+    }
+    function Controller() {}
+
+    // API:
+    // return property path array from root to current node
+    Controller.prototype.path = function path() {
+      var i, iz, j, jz, result, element;
+      function addToPath(result, path) {
+        if (Array.isArray(path)) {
+          for (j = 0, jz = path.length; j < jz; ++j) {
+            result.push(path[j]);
+          }
+        } else {
+          result.push(path);
+        }
+      }
+
+      // root node
+      if (!this.__current.path) {
+        return null;
+      }
+
+      // first node is sentinel, second node is root element
+      result = [];
+      for (i = 2, iz = this.__leavelist.length; i < iz; ++i) {
+        element = this.__leavelist[i];
+        addToPath(result, element.path);
+      }
+      addToPath(result, this.__current.path);
+      return result;
+    };
+
+    // API:
+    // return type of current node
+    Controller.prototype.type = function () {
+      var node = this.current();
+      return node.type || this.__current.wrap;
+    };
+
+    // API:
+    // return array of parent elements
+    Controller.prototype.parents = function parents() {
+      var i, iz, result;
+
+      // first node is sentinel
+      result = [];
+      for (i = 1, iz = this.__leavelist.length; i < iz; ++i) {
+        result.push(this.__leavelist[i].node);
+      }
+      return result;
+    };
+
+    // API:
+    // return current node
+    Controller.prototype.current = function current() {
+      return this.__current.node;
+    };
+    Controller.prototype.__execute = function __execute(callback, element) {
+      var previous, result;
+      result = undefined;
+      previous = this.__current;
+      this.__current = element;
+      this.__state = null;
+      if (callback) {
+        result = callback.call(this, element.node, this.__leavelist[this.__leavelist.length - 1].node);
+      }
+      this.__current = previous;
+      return result;
+    };
+
+    // API:
+    // notify control skip / break
+    Controller.prototype.notify = function notify(flag) {
+      this.__state = flag;
+    };
+
+    // API:
+    // skip child nodes of current node
+    Controller.prototype.skip = function () {
+      this.notify(SKIP);
+    };
+
+    // API:
+    // break traversals
+    Controller.prototype['break'] = function () {
+      this.notify(BREAK);
+    };
+
+    // API:
+    // remove node
+    Controller.prototype.remove = function () {
+      this.notify(REMOVE);
+    };
+    Controller.prototype.__initialize = function (root, visitor) {
+      this.visitor = visitor;
+      this.root = root;
+      this.__worklist = [];
+      this.__leavelist = [];
+      this.__current = null;
+      this.__state = null;
+      this.__fallback = null;
+      if (visitor.fallback === 'iteration') {
+        this.__fallback = Object.keys;
+      } else if (typeof visitor.fallback === 'function') {
+        this.__fallback = visitor.fallback;
+      }
+      this.__keys = VisitorKeys;
+      if (visitor.keys) {
+        this.__keys = Object.assign(Object.create(this.__keys), visitor.keys);
+      }
+    };
+    function isNode(node) {
+      if (node == null) {
+        return false;
+      }
+      return typeof node === 'object' && typeof node.type === 'string';
+    }
+    function isProperty(nodeType, key) {
+      return (nodeType === Syntax.ObjectExpression || nodeType === Syntax.ObjectPattern) && 'properties' === key;
+    }
+    function candidateExistsInLeaveList(leavelist, candidate) {
+      for (var i = leavelist.length - 1; i >= 0; --i) {
+        if (leavelist[i].node === candidate) {
+          return true;
+        }
+      }
+      return false;
+    }
+    Controller.prototype.traverse = function traverse(root, visitor) {
+      var worklist, leavelist, element, node, nodeType, ret, key, current, current2, candidates, candidate, sentinel;
+      this.__initialize(root, visitor);
+      sentinel = {};
+
+      // reference
+      worklist = this.__worklist;
+      leavelist = this.__leavelist;
+
+      // initialize
+      worklist.push(new Element(root, null, null, null));
+      leavelist.push(new Element(null, null, null, null));
+      while (worklist.length) {
+        element = worklist.pop();
+        if (element === sentinel) {
+          element = leavelist.pop();
+          ret = this.__execute(visitor.leave, element);
+          if (this.__state === BREAK || ret === BREAK) {
+            return;
+          }
+          continue;
+        }
+        if (element.node) {
+          ret = this.__execute(visitor.enter, element);
+          if (this.__state === BREAK || ret === BREAK) {
+            return;
+          }
+          worklist.push(sentinel);
+          leavelist.push(element);
+          if (this.__state === SKIP || ret === SKIP) {
+            continue;
+          }
+          node = element.node;
+          nodeType = node.type || element.wrap;
+          candidates = this.__keys[nodeType];
+          if (!candidates) {
+            if (this.__fallback) {
+              candidates = this.__fallback(node);
+            } else {
+              throw new Error('Unknown node type ' + nodeType + '.');
+            }
+          }
+          current = candidates.length;
+          while ((current -= 1) >= 0) {
+            key = candidates[current];
+            candidate = node[key];
+            if (!candidate) {
+              continue;
+            }
+            if (Array.isArray(candidate)) {
+              current2 = candidate.length;
+              while ((current2 -= 1) >= 0) {
+                if (!candidate[current2]) {
+                  continue;
+                }
+                if (candidateExistsInLeaveList(leavelist, candidate[current2])) {
+                  continue;
+                }
+                if (isProperty(nodeType, candidates[current])) {
+                  element = new Element(candidate[current2], [key, current2], 'Property', null);
+                } else if (isNode(candidate[current2])) {
+                  element = new Element(candidate[current2], [key, current2], null, null);
+                } else {
+                  continue;
+                }
+                worklist.push(element);
+              }
+            } else if (isNode(candidate)) {
+              if (candidateExistsInLeaveList(leavelist, candidate)) {
+                continue;
+              }
+              worklist.push(new Element(candidate, key, null, null));
+            }
+          }
+        }
+      }
+    };
+    Controller.prototype.replace = function replace(root, visitor) {
+      var worklist, leavelist, node, nodeType, target, element, current, current2, candidates, candidate, sentinel, outer, key;
+      function removeElem(element) {
+        var i, key, nextElem, parent;
+        if (element.ref.remove()) {
+          // When the reference is an element of an array.
+          key = element.ref.key;
+          parent = element.ref.parent;
+
+          // If removed from array, then decrease following items' keys.
+          i = worklist.length;
+          while (i--) {
+            nextElem = worklist[i];
+            if (nextElem.ref && nextElem.ref.parent === parent) {
+              if (nextElem.ref.key < key) {
+                break;
+              }
+              --nextElem.ref.key;
+            }
+          }
+        }
+      }
+      this.__initialize(root, visitor);
+      sentinel = {};
+
+      // reference
+      worklist = this.__worklist;
+      leavelist = this.__leavelist;
+
+      // initialize
+      outer = {
+        root: root
+      };
+      element = new Element(root, null, null, new Reference(outer, 'root'));
+      worklist.push(element);
+      leavelist.push(element);
+      while (worklist.length) {
+        element = worklist.pop();
+        if (element === sentinel) {
+          element = leavelist.pop();
+          target = this.__execute(visitor.leave, element);
+
+          // node may be replaced with null,
+          // so distinguish between undefined and null in this place
+          if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {
+            // replace
+            element.ref.replace(target);
+          }
+          if (this.__state === REMOVE || target === REMOVE) {
+            removeElem(element);
+          }
+          if (this.__state === BREAK || target === BREAK) {
+            return outer.root;
+          }
+          continue;
+        }
+        target = this.__execute(visitor.enter, element);
+
+        // node may be replaced with null,
+        // so distinguish between undefined and null in this place
+        if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {
+          // replace
+          element.ref.replace(target);
+          element.node = target;
+        }
+        if (this.__state === REMOVE || target === REMOVE) {
+          removeElem(element);
+          element.node = null;
+        }
+        if (this.__state === BREAK || target === BREAK) {
+          return outer.root;
+        }
+
+        // node may be null
+        node = element.node;
+        if (!node) {
+          continue;
+        }
+        worklist.push(sentinel);
+        leavelist.push(element);
+        if (this.__state === SKIP || target === SKIP) {
+          continue;
+        }
+        nodeType = node.type || element.wrap;
+        candidates = this.__keys[nodeType];
+        if (!candidates) {
+          if (this.__fallback) {
+            candidates = this.__fallback(node);
+          } else {
+            throw new Error('Unknown node type ' + nodeType + '.');
+          }
+        }
+        current = candidates.length;
+        while ((current -= 1) >= 0) {
+          key = candidates[current];
+          candidate = node[key];
+          if (!candidate) {
+            continue;
+          }
+          if (Array.isArray(candidate)) {
+            current2 = candidate.length;
+            while ((current2 -= 1) >= 0) {
+              if (!candidate[current2]) {
+                continue;
+              }
+              if (isProperty(nodeType, candidates[current])) {
+                element = new Element(candidate[current2], [key, current2], 'Property', new Reference(candidate, current2));
+              } else if (isNode(candidate[current2])) {
+                element = new Element(candidate[current2], [key, current2], null, new Reference(candidate, current2));
+              } else {
+                continue;
+              }
+              worklist.push(element);
+            }
+          } else if (isNode(candidate)) {
+            worklist.push(new Element(candidate, key, null, new Reference(node, key)));
+          }
+        }
+      }
+      return outer.root;
+    };
+    function traverse(root, visitor) {
+      var controller = new Controller();
+      return controller.traverse(root, visitor);
+    }
+    function replace(root, visitor) {
+      var controller = new Controller();
+      return controller.replace(root, visitor);
+    }
+    function extendCommentRange(comment, tokens) {
+      var target;
+      target = upperBound(tokens, function search(token) {
+        return token.range[0] > comment.range[0];
+      });
+      comment.extendedRange = [comment.range[0], comment.range[1]];
+      if (target !== tokens.length) {
+        comment.extendedRange[1] = tokens[target].range[0];
+      }
+      target -= 1;
+      if (target >= 0) {
+        comment.extendedRange[0] = tokens[target].range[1];
+      }
+      return comment;
+    }
+    function attachComments(tree, providedComments, tokens) {
+      // At first, we should calculate extended comment ranges.
+      var comments = [],
+        comment,
+        len,
+        i,
+        cursor;
+      if (!tree.range) {
+        throw new Error('attachComments needs range information');
+      }
+
+      // tokens array is empty, we attach comments to tree as 'leadingComments'
+      if (!tokens.length) {
+        if (providedComments.length) {
+          for (i = 0, len = providedComments.length; i < len; i += 1) {
+            comment = deepCopy(providedComments[i]);
+            comment.extendedRange = [0, tree.range[0]];
+            comments.push(comment);
+          }
+          tree.leadingComments = comments;
+        }
+        return tree;
+      }
+      for (i = 0, len = providedComments.length; i < len; i += 1) {
+        comments.push(extendCommentRange(deepCopy(providedComments[i]), tokens));
+      }
+
+      // This is based on John Freeman's implementation.
+      cursor = 0;
+      traverse(tree, {
+        enter: function (node) {
+          var comment;
+          while (cursor < comments.length) {
+            comment = comments[cursor];
+            if (comment.extendedRange[1] > node.range[0]) {
+              break;
+            }
+            if (comment.extendedRange[1] === node.range[0]) {
+              if (!node.leadingComments) {
+                node.leadingComments = [];
+              }
+              node.leadingComments.push(comment);
+              comments.splice(cursor, 1);
+            } else {
+              cursor += 1;
+            }
+          }
+
+          // already out of owned node
+          if (cursor === comments.length) {
+            return VisitorOption.Break;
+          }
+          if (comments[cursor].extendedRange[0] > node.range[1]) {
+            return VisitorOption.Skip;
+          }
+        }
+      });
+      cursor = 0;
+      traverse(tree, {
+        leave: function (node) {
+          var comment;
+          while (cursor < comments.length) {
+            comment = comments[cursor];
+            if (node.range[1] < comment.extendedRange[0]) {
+              break;
+            }
+            if (node.range[1] === comment.extendedRange[0]) {
+              if (!node.trailingComments) {
+                node.trailingComments = [];
+              }
+              node.trailingComments.push(comment);
+              comments.splice(cursor, 1);
+            } else {
+              cursor += 1;
+            }
+          }
+
+          // already out of owned node
+          if (cursor === comments.length) {
+            return VisitorOption.Break;
+          }
+          if (comments[cursor].extendedRange[0] > node.range[1]) {
+            return VisitorOption.Skip;
+          }
+        }
+      });
+      return tree;
+    }
+    exports.Syntax = Syntax;
+    exports.traverse = traverse;
+    exports.replace = replace;
+    exports.attachComments = attachComments;
+    exports.VisitorKeys = VisitorKeys;
+    exports.VisitorOption = VisitorOption;
+    exports.Controller = Controller;
+    exports.cloneEnvironment = function () {
+      return clone({});
+    };
+    return exports;
+  })(exports);
+  /* vim: set sw=4 ts=4 et tw=80 : */
+});
+
+var parser = createCommonjsModule(function (module) {
+  /*
+   * Generated by PEG.js 0.10.0.
+   *
+   * http://pegjs.org/
+   */
+  (function (root, factory) {
+    if ( module.exports) {
+      module.exports = factory();
+    }
+  })(commonjsGlobal, function () {
+
+    function peg$subclass(child, parent) {
+      function ctor() {
+        this.constructor = child;
+      }
+      ctor.prototype = parent.prototype;
+      child.prototype = new ctor();
+    }
+    function peg$SyntaxError(message, expected, found, location) {
+      this.message = message;
+      this.expected = expected;
+      this.found = found;
+      this.location = location;
+      this.name = "SyntaxError";
+      if (typeof Error.captureStackTrace === "function") {
+        Error.captureStackTrace(this, peg$SyntaxError);
+      }
+    }
+    peg$subclass(peg$SyntaxError, Error);
+    peg$SyntaxError.buildMessage = function (expected, found) {
+      var DESCRIBE_EXPECTATION_FNS = {
+        literal: function literal(expectation) {
+          return "\"" + literalEscape(expectation.text) + "\"";
+        },
+        "class": function _class(expectation) {
+          var escapedParts = "",
+            i;
+          for (i = 0; i < expectation.parts.length; i++) {
+            escapedParts += expectation.parts[i] instanceof Array ? classEscape(expectation.parts[i][0]) + "-" + classEscape(expectation.parts[i][1]) : classEscape(expectation.parts[i]);
+          }
+          return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
+        },
+        any: function any(expectation) {
+          return "any character";
+        },
+        end: function end(expectation) {
+          return "end of input";
+        },
+        other: function other(expectation) {
+          return expectation.description;
+        }
+      };
+      function hex(ch) {
+        return ch.charCodeAt(0).toString(16).toUpperCase();
+      }
+      function literalEscape(s) {
+        return s.replace(/\\/g, '\\\\').replace(/"/g, '\\"').replace(/\0/g, '\\0').replace(/\t/g, '\\t').replace(/\n/g, '\\n').replace(/\r/g, '\\r').replace(/[\x00-\x0F]/g, function (ch) {
+          return '\\x0' + hex(ch);
+        }).replace(/[\x10-\x1F\x7F-\x9F]/g, function (ch) {
+          return '\\x' + hex(ch);
+        });
+      }
+      function classEscape(s) {
+        return s.replace(/\\/g, '\\\\').replace(/\]/g, '\\]').replace(/\^/g, '\\^').replace(/-/g, '\\-').replace(/\0/g, '\\0').replace(/\t/g, '\\t').replace(/\n/g, '\\n').replace(/\r/g, '\\r').replace(/[\x00-\x0F]/g, function (ch) {
+          return '\\x0' + hex(ch);
+        }).replace(/[\x10-\x1F\x7F-\x9F]/g, function (ch) {
+          return '\\x' + hex(ch);
+        });
+      }
+      function describeExpectation(expectation) {
+        return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
+      }
+      function describeExpected(expected) {
+        var descriptions = new Array(expected.length),
+          i,
+          j;
+        for (i = 0; i < expected.length; i++) {
+          descriptions[i] = describeExpectation(expected[i]);
+        }
+        descriptions.sort();
+        if (descriptions.length > 0) {
+          for (i = 1, j = 1; i < descriptions.length; i++) {
+            if (descriptions[i - 1] !== descriptions[i]) {
+              descriptions[j] = descriptions[i];
+              j++;
+            }
+          }
+          descriptions.length = j;
+        }
+        switch (descriptions.length) {
+          case 1:
+            return descriptions[0];
+          case 2:
+            return descriptions[0] + " or " + descriptions[1];
+          default:
+            return descriptions.slice(0, -1).join(", ") + ", or " + descriptions[descriptions.length - 1];
+        }
+      }
+      function describeFound(found) {
+        return found ? "\"" + literalEscape(found) + "\"" : "end of input";
+      }
+      return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
+    };
+    function peg$parse(input, options) {
+      options = options !== void 0 ? options : {};
+      var peg$FAILED = {},
+        peg$startRuleFunctions = {
+          start: peg$parsestart
+        },
+        peg$startRuleFunction = peg$parsestart,
+        peg$c0 = function peg$c0(ss) {
+          return ss.length === 1 ? ss[0] : {
+            type: 'matches',
+            selectors: ss
+          };
+        },
+        peg$c1 = function peg$c1() {
+          return void 0;
+        },
+        peg$c2 = " ",
+        peg$c3 = peg$literalExpectation(" ", false),
+        peg$c4 = /^[^ [\],():#!=><~+.]/,
+        peg$c5 = peg$classExpectation([" ", "[", "]", ",", "(", ")", ":", "#", "!", "=", ">", "<", "~", "+", "."], true, false),
+        peg$c6 = function peg$c6(i) {
+          return i.join('');
+        },
+        peg$c7 = ">",
+        peg$c8 = peg$literalExpectation(">", false),
+        peg$c9 = function peg$c9() {
+          return 'child';
+        },
+        peg$c10 = "~",
+        peg$c11 = peg$literalExpectation("~", false),
+        peg$c12 = function peg$c12() {
+          return 'sibling';
+        },
+        peg$c13 = "+",
+        peg$c14 = peg$literalExpectation("+", false),
+        peg$c15 = function peg$c15() {
+          return 'adjacent';
+        },
+        peg$c16 = function peg$c16() {
+          return 'descendant';
+        },
+        peg$c17 = ",",
+        peg$c18 = peg$literalExpectation(",", false),
+        peg$c19 = function peg$c19(s, ss) {
+          return [s].concat(ss.map(function (s) {
+            return s[3];
+          }));
+        },
+        peg$c20 = function peg$c20(op, s) {
+          if (!op) return s;
+          return {
+            type: op,
+            left: {
+              type: 'exactNode'
+            },
+            right: s
+          };
+        },
+        peg$c21 = function peg$c21(a, ops) {
+          return ops.reduce(function (memo, rhs) {
+            return {
+              type: rhs[0],
+              left: memo,
+              right: rhs[1]
+            };
+          }, a);
+        },
+        peg$c22 = "!",
+        peg$c23 = peg$literalExpectation("!", false),
+        peg$c24 = function peg$c24(subject, as) {
+          var b = as.length === 1 ? as[0] : {
+            type: 'compound',
+            selectors: as
+          };
+          if (subject) b.subject = true;
+          return b;
+        },
+        peg$c25 = "*",
+        peg$c26 = peg$literalExpectation("*", false),
+        peg$c27 = function peg$c27(a) {
+          return {
+            type: 'wildcard',
+            value: a
+          };
+        },
+        peg$c28 = "#",
+        peg$c29 = peg$literalExpectation("#", false),
+        peg$c30 = function peg$c30(i) {
+          return {
+            type: 'identifier',
+            value: i
+          };
+        },
+        peg$c31 = "[",
+        peg$c32 = peg$literalExpectation("[", false),
+        peg$c33 = "]",
+        peg$c34 = peg$literalExpectation("]", false),
+        peg$c35 = function peg$c35(v) {
+          return v;
+        },
+        peg$c36 = /^[><!]/,
+        peg$c37 = peg$classExpectation([">", "<", "!"], false, false),
+        peg$c38 = "=",
+        peg$c39 = peg$literalExpectation("=", false),
+        peg$c40 = function peg$c40(a) {
+          return (a || '') + '=';
+        },
+        peg$c41 = /^[><]/,
+        peg$c42 = peg$classExpectation([">", "<"], false, false),
+        peg$c43 = ".",
+        peg$c44 = peg$literalExpectation(".", false),
+        peg$c45 = function peg$c45(a, as) {
+          return [].concat.apply([a], as).join('');
+        },
+        peg$c46 = function peg$c46(name, op, value) {
+          return {
+            type: 'attribute',
+            name: name,
+            operator: op,
+            value: value
+          };
+        },
+        peg$c47 = function peg$c47(name) {
+          return {
+            type: 'attribute',
+            name: name
+          };
+        },
+        peg$c48 = "\"",
+        peg$c49 = peg$literalExpectation("\"", false),
+        peg$c50 = /^[^\\"]/,
+        peg$c51 = peg$classExpectation(["\\", "\""], true, false),
+        peg$c52 = "\\",
+        peg$c53 = peg$literalExpectation("\\", false),
+        peg$c54 = peg$anyExpectation(),
+        peg$c55 = function peg$c55(a, b) {
+          return a + b;
+        },
+        peg$c56 = function peg$c56(d) {
+          return {
+            type: 'literal',
+            value: strUnescape(d.join(''))
+          };
+        },
+        peg$c57 = "'",
+        peg$c58 = peg$literalExpectation("'", false),
+        peg$c59 = /^[^\\']/,
+        peg$c60 = peg$classExpectation(["\\", "'"], true, false),
+        peg$c61 = /^[0-9]/,
+        peg$c62 = peg$classExpectation([["0", "9"]], false, false),
+        peg$c63 = function peg$c63(a, b) {
+          // Can use `a.flat().join('')` once supported
+          var leadingDecimals = a ? [].concat.apply([], a).join('') : '';
+          return {
+            type: 'literal',
+            value: parseFloat(leadingDecimals + b.join(''))
+          };
+        },
+        peg$c64 = function peg$c64(i) {
+          return {
+            type: 'literal',
+            value: i
+          };
+        },
+        peg$c65 = "type(",
+        peg$c66 = peg$literalExpectation("type(", false),
+        peg$c67 = /^[^ )]/,
+        peg$c68 = peg$classExpectation([" ", ")"], true, false),
+        peg$c69 = ")",
+        peg$c70 = peg$literalExpectation(")", false),
+        peg$c71 = function peg$c71(t) {
+          return {
+            type: 'type',
+            value: t.join('')
+          };
+        },
+        peg$c72 = /^[imsu]/,
+        peg$c73 = peg$classExpectation(["i", "m", "s", "u"], false, false),
+        peg$c74 = "/",
+        peg$c75 = peg$literalExpectation("/", false),
+        peg$c76 = function peg$c76(pattern, flgs) {
+          return {
+            type: 'regexp',
+            value: new RegExp(pattern.join(''), flgs ? flgs.join('') : '')
+          };
+        },
+        peg$c77 = /^[^\]\\]/,
+        peg$c78 = peg$classExpectation(["]", "\\"], true, false),
+        peg$c79 = function peg$c79(cs) {
+          return '[' + cs.join('') + ']';
+        },
+        peg$c80 = function peg$c80(a) {
+          return '\\' + a;
+        },
+        peg$c81 = /^[^\/\\[]/,
+        peg$c82 = peg$classExpectation(["/", "\\", "["], true, false),
+        peg$c83 = function peg$c83(cs) {
+          return cs.join('');
+        },
+        peg$c84 = function peg$c84(i, is) {
+          return {
+            type: 'field',
+            name: is.reduce(function (memo, p) {
+              return memo + p[0] + p[1];
+            }, i)
+          };
+        },
+        peg$c85 = ":not(",
+        peg$c86 = peg$literalExpectation(":not(", false),
+        peg$c87 = function peg$c87(ss) {
+          return {
+            type: 'not',
+            selectors: ss
+          };
+        },
+        peg$c88 = ":matches(",
+        peg$c89 = peg$literalExpectation(":matches(", false),
+        peg$c90 = function peg$c90(ss) {
+          return {
+            type: 'matches',
+            selectors: ss
+          };
+        },
+        peg$c91 = ":is(",
+        peg$c92 = peg$literalExpectation(":is(", false),
+        peg$c93 = ":has(",
+        peg$c94 = peg$literalExpectation(":has(", false),
+        peg$c95 = function peg$c95(ss) {
+          return {
+            type: 'has',
+            selectors: ss
+          };
+        },
+        peg$c96 = ":first-child",
+        peg$c97 = peg$literalExpectation(":first-child", false),
+        peg$c98 = function peg$c98() {
+          return nth(1);
+        },
+        peg$c99 = ":last-child",
+        peg$c100 = peg$literalExpectation(":last-child", false),
+        peg$c101 = function peg$c101() {
+          return nthLast(1);
+        },
+        peg$c102 = ":nth-child(",
+        peg$c103 = peg$literalExpectation(":nth-child(", false),
+        peg$c104 = function peg$c104(n) {
+          return nth(parseInt(n.join(''), 10));
+        },
+        peg$c105 = ":nth-last-child(",
+        peg$c106 = peg$literalExpectation(":nth-last-child(", false),
+        peg$c107 = function peg$c107(n) {
+          return nthLast(parseInt(n.join(''), 10));
+        },
+        peg$c108 = ":",
+        peg$c109 = peg$literalExpectation(":", false),
+        peg$c110 = function peg$c110(c) {
+          return {
+            type: 'class',
+            name: c
+          };
+        },
+        peg$currPos = 0,
+        peg$posDetailsCache = [{
+          line: 1,
+          column: 1
+        }],
+        peg$maxFailPos = 0,
+        peg$maxFailExpected = [],
+        peg$resultsCache = {},
+        peg$result;
+      if ("startRule" in options) {
+        if (!(options.startRule in peg$startRuleFunctions)) {
+          throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
+        }
+        peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
+      }
+      function peg$literalExpectation(text, ignoreCase) {
+        return {
+          type: "literal",
+          text: text,
+          ignoreCase: ignoreCase
+        };
+      }
+      function peg$classExpectation(parts, inverted, ignoreCase) {
+        return {
+          type: "class",
+          parts: parts,
+          inverted: inverted,
+          ignoreCase: ignoreCase
+        };
+      }
+      function peg$anyExpectation() {
+        return {
+          type: "any"
+        };
+      }
+      function peg$endExpectation() {
+        return {
+          type: "end"
+        };
+      }
+      function peg$computePosDetails(pos) {
+        var details = peg$posDetailsCache[pos],
+          p;
+        if (details) {
+          return details;
+        } else {
+          p = pos - 1;
+          while (!peg$posDetailsCache[p]) {
+            p--;
+          }
+          details = peg$posDetailsCache[p];
+          details = {
+            line: details.line,
+            column: details.column
+          };
+          while (p < pos) {
+            if (input.charCodeAt(p) === 10) {
+              details.line++;
+              details.column = 1;
+            } else {
+              details.column++;
+            }
+            p++;
+          }
+          peg$posDetailsCache[pos] = details;
+          return details;
+        }
+      }
+      function peg$computeLocation(startPos, endPos) {
+        var startPosDetails = peg$computePosDetails(startPos),
+          endPosDetails = peg$computePosDetails(endPos);
+        return {
+          start: {
+            offset: startPos,
+            line: startPosDetails.line,
+            column: startPosDetails.column
+          },
+          end: {
+            offset: endPos,
+            line: endPosDetails.line,
+            column: endPosDetails.column
+          }
+        };
+      }
+      function peg$fail(expected) {
+        if (peg$currPos < peg$maxFailPos) {
+          return;
+        }
+        if (peg$currPos > peg$maxFailPos) {
+          peg$maxFailPos = peg$currPos;
+          peg$maxFailExpected = [];
+        }
+        peg$maxFailExpected.push(expected);
+      }
+      function peg$buildStructuredError(expected, found, location) {
+        return new peg$SyntaxError(peg$SyntaxError.buildMessage(expected, found), expected, found, location);
+      }
+      function peg$parsestart() {
+        var s0, s1, s2, s3;
+        var key = peg$currPos * 36 + 0,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        s1 = peg$parse_();
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parseselectors();
+          if (s2 !== peg$FAILED) {
+            s3 = peg$parse_();
+            if (s3 !== peg$FAILED) {
+              s1 = peg$c0(s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        if (s0 === peg$FAILED) {
+          s0 = peg$currPos;
+          s1 = peg$parse_();
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c1();
+          }
+          s0 = s1;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parse_() {
+        var s0, s1;
+        var key = peg$currPos * 36 + 1,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = [];
+        if (input.charCodeAt(peg$currPos) === 32) {
+          s1 = peg$c2;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c3);
+          }
+        }
+        while (s1 !== peg$FAILED) {
+          s0.push(s1);
+          if (input.charCodeAt(peg$currPos) === 32) {
+            s1 = peg$c2;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c3);
+            }
+          }
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseidentifierName() {
+        var s0, s1, s2;
+        var key = peg$currPos * 36 + 2,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        s1 = [];
+        if (peg$c4.test(input.charAt(peg$currPos))) {
+          s2 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          {
+            peg$fail(peg$c5);
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          while (s2 !== peg$FAILED) {
+            s1.push(s2);
+            if (peg$c4.test(input.charAt(peg$currPos))) {
+              s2 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s2 = peg$FAILED;
+              {
+                peg$fail(peg$c5);
+              }
+            }
+          }
+        } else {
+          s1 = peg$FAILED;
+        }
+        if (s1 !== peg$FAILED) {
+          s1 = peg$c6(s1);
+        }
+        s0 = s1;
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsebinaryOp() {
+        var s0, s1, s2, s3;
+        var key = peg$currPos * 36 + 3,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        s1 = peg$parse_();
+        if (s1 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 62) {
+            s2 = peg$c7;
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            {
+              peg$fail(peg$c8);
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            s3 = peg$parse_();
+            if (s3 !== peg$FAILED) {
+              s1 = peg$c9();
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        if (s0 === peg$FAILED) {
+          s0 = peg$currPos;
+          s1 = peg$parse_();
+          if (s1 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 126) {
+              s2 = peg$c10;
+              peg$currPos++;
+            } else {
+              s2 = peg$FAILED;
+              {
+                peg$fail(peg$c11);
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parse_();
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c12();
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            s1 = peg$parse_();
+            if (s1 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 43) {
+                s2 = peg$c13;
+                peg$currPos++;
+              } else {
+                s2 = peg$FAILED;
+                {
+                  peg$fail(peg$c14);
+                }
+              }
+              if (s2 !== peg$FAILED) {
+                s3 = peg$parse_();
+                if (s3 !== peg$FAILED) {
+                  s1 = peg$c15();
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+            if (s0 === peg$FAILED) {
+              s0 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 32) {
+                s1 = peg$c2;
+                peg$currPos++;
+              } else {
+                s1 = peg$FAILED;
+                {
+                  peg$fail(peg$c3);
+                }
+              }
+              if (s1 !== peg$FAILED) {
+                s2 = peg$parse_();
+                if (s2 !== peg$FAILED) {
+                  s1 = peg$c16();
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            }
+          }
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsehasSelectors() {
+        var s0, s1, s2, s3, s4, s5, s6, s7;
+        var key = peg$currPos * 36 + 4,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        s1 = peg$parsehasSelector();
+        if (s1 !== peg$FAILED) {
+          s2 = [];
+          s3 = peg$currPos;
+          s4 = peg$parse_();
+          if (s4 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 44) {
+              s5 = peg$c17;
+              peg$currPos++;
+            } else {
+              s5 = peg$FAILED;
+              {
+                peg$fail(peg$c18);
+              }
+            }
+            if (s5 !== peg$FAILED) {
+              s6 = peg$parse_();
+              if (s6 !== peg$FAILED) {
+                s7 = peg$parsehasSelector();
+                if (s7 !== peg$FAILED) {
+                  s4 = [s4, s5, s6, s7];
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            s3 = peg$currPos;
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 44) {
+                s5 = peg$c17;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                {
+                  peg$fail(peg$c18);
+                }
+              }
+              if (s5 !== peg$FAILED) {
+                s6 = peg$parse_();
+                if (s6 !== peg$FAILED) {
+                  s7 = peg$parsehasSelector();
+                  if (s7 !== peg$FAILED) {
+                    s4 = [s4, s5, s6, s7];
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            s1 = peg$c19(s1, s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseselectors() {
+        var s0, s1, s2, s3, s4, s5, s6, s7;
+        var key = peg$currPos * 36 + 5,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        s1 = peg$parseselector();
+        if (s1 !== peg$FAILED) {
+          s2 = [];
+          s3 = peg$currPos;
+          s4 = peg$parse_();
+          if (s4 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 44) {
+              s5 = peg$c17;
+              peg$currPos++;
+            } else {
+              s5 = peg$FAILED;
+              {
+                peg$fail(peg$c18);
+              }
+            }
+            if (s5 !== peg$FAILED) {
+              s6 = peg$parse_();
+              if (s6 !== peg$FAILED) {
+                s7 = peg$parseselector();
+                if (s7 !== peg$FAILED) {
+                  s4 = [s4, s5, s6, s7];
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            s3 = peg$currPos;
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 44) {
+                s5 = peg$c17;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                {
+                  peg$fail(peg$c18);
+                }
+              }
+              if (s5 !== peg$FAILED) {
+                s6 = peg$parse_();
+                if (s6 !== peg$FAILED) {
+                  s7 = peg$parseselector();
+                  if (s7 !== peg$FAILED) {
+                    s4 = [s4, s5, s6, s7];
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            s1 = peg$c19(s1, s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsehasSelector() {
+        var s0, s1, s2;
+        var key = peg$currPos * 36 + 6,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        s1 = peg$parsebinaryOp();
+        if (s1 === peg$FAILED) {
+          s1 = null;
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parseselector();
+          if (s2 !== peg$FAILED) {
+            s1 = peg$c20(s1, s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseselector() {
+        var s0, s1, s2, s3, s4, s5;
+        var key = peg$currPos * 36 + 7,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        s1 = peg$parsesequence();
+        if (s1 !== peg$FAILED) {
+          s2 = [];
+          s3 = peg$currPos;
+          s4 = peg$parsebinaryOp();
+          if (s4 !== peg$FAILED) {
+            s5 = peg$parsesequence();
+            if (s5 !== peg$FAILED) {
+              s4 = [s4, s5];
+              s3 = s4;
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            s3 = peg$currPos;
+            s4 = peg$parsebinaryOp();
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parsesequence();
+              if (s5 !== peg$FAILED) {
+                s4 = [s4, s5];
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            s1 = peg$c21(s1, s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsesequence() {
+        var s0, s1, s2, s3;
+        var key = peg$currPos * 36 + 8,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 33) {
+          s1 = peg$c22;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c23);
+          }
+        }
+        if (s1 === peg$FAILED) {
+          s1 = null;
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = [];
+          s3 = peg$parseatom();
+          if (s3 !== peg$FAILED) {
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              s3 = peg$parseatom();
+            }
+          } else {
+            s2 = peg$FAILED;
+          }
+          if (s2 !== peg$FAILED) {
+            s1 = peg$c24(s1, s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseatom() {
+        var s0;
+        var key = peg$currPos * 36 + 9,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$parsewildcard();
+        if (s0 === peg$FAILED) {
+          s0 = peg$parseidentifier();
+          if (s0 === peg$FAILED) {
+            s0 = peg$parseattr();
+            if (s0 === peg$FAILED) {
+              s0 = peg$parsefield();
+              if (s0 === peg$FAILED) {
+                s0 = peg$parsenegation();
+                if (s0 === peg$FAILED) {
+                  s0 = peg$parsematches();
+                  if (s0 === peg$FAILED) {
+                    s0 = peg$parseis();
+                    if (s0 === peg$FAILED) {
+                      s0 = peg$parsehas();
+                      if (s0 === peg$FAILED) {
+                        s0 = peg$parsefirstChild();
+                        if (s0 === peg$FAILED) {
+                          s0 = peg$parselastChild();
+                          if (s0 === peg$FAILED) {
+                            s0 = peg$parsenthChild();
+                            if (s0 === peg$FAILED) {
+                              s0 = peg$parsenthLastChild();
+                              if (s0 === peg$FAILED) {
+                                s0 = peg$parseclass();
+                              }
+                            }
+                          }
+                        }
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsewildcard() {
+        var s0, s1;
+        var key = peg$currPos * 36 + 10,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 42) {
+          s1 = peg$c25;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c26);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s1 = peg$c27(s1);
+        }
+        s0 = s1;
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseidentifier() {
+        var s0, s1, s2;
+        var key = peg$currPos * 36 + 11,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 35) {
+          s1 = peg$c28;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c29);
+          }
+        }
+        if (s1 === peg$FAILED) {
+          s1 = null;
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parseidentifierName();
+          if (s2 !== peg$FAILED) {
+            s1 = peg$c30(s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseattr() {
+        var s0, s1, s2, s3, s4, s5;
+        var key = peg$currPos * 36 + 12,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 91) {
+          s1 = peg$c31;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c32);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parse_();
+          if (s2 !== peg$FAILED) {
+            s3 = peg$parseattrValue();
+            if (s3 !== peg$FAILED) {
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 93) {
+                  s5 = peg$c33;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c34);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s1 = peg$c35(s3);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseattrOps() {
+        var s0, s1, s2;
+        var key = peg$currPos * 36 + 13,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (peg$c36.test(input.charAt(peg$currPos))) {
+          s1 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c37);
+          }
+        }
+        if (s1 === peg$FAILED) {
+          s1 = null;
+        }
+        if (s1 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 61) {
+            s2 = peg$c38;
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            {
+              peg$fail(peg$c39);
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            s1 = peg$c40(s1);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        if (s0 === peg$FAILED) {
+          if (peg$c41.test(input.charAt(peg$currPos))) {
+            s0 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s0 = peg$FAILED;
+            {
+              peg$fail(peg$c42);
+            }
+          }
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseattrEqOps() {
+        var s0, s1, s2;
+        var key = peg$currPos * 36 + 14,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 33) {
+          s1 = peg$c22;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c23);
+          }
+        }
+        if (s1 === peg$FAILED) {
+          s1 = null;
+        }
+        if (s1 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 61) {
+            s2 = peg$c38;
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            {
+              peg$fail(peg$c39);
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            s1 = peg$c40(s1);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseattrName() {
+        var s0, s1, s2, s3, s4, s5;
+        var key = peg$currPos * 36 + 15,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        s1 = peg$parseidentifierName();
+        if (s1 !== peg$FAILED) {
+          s2 = [];
+          s3 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 46) {
+            s4 = peg$c43;
+            peg$currPos++;
+          } else {
+            s4 = peg$FAILED;
+            {
+              peg$fail(peg$c44);
+            }
+          }
+          if (s4 !== peg$FAILED) {
+            s5 = peg$parseidentifierName();
+            if (s5 !== peg$FAILED) {
+              s4 = [s4, s5];
+              s3 = s4;
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            s3 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 46) {
+              s4 = peg$c43;
+              peg$currPos++;
+            } else {
+              s4 = peg$FAILED;
+              {
+                peg$fail(peg$c44);
+              }
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseidentifierName();
+              if (s5 !== peg$FAILED) {
+                s4 = [s4, s5];
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            s1 = peg$c45(s1, s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseattrValue() {
+        var s0, s1, s2, s3, s4, s5;
+        var key = peg$currPos * 36 + 16,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        s1 = peg$parseattrName();
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parse_();
+          if (s2 !== peg$FAILED) {
+            s3 = peg$parseattrEqOps();
+            if (s3 !== peg$FAILED) {
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                s5 = peg$parsetype();
+                if (s5 === peg$FAILED) {
+                  s5 = peg$parseregex();
+                }
+                if (s5 !== peg$FAILED) {
+                  s1 = peg$c46(s1, s3, s5);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        if (s0 === peg$FAILED) {
+          s0 = peg$currPos;
+          s1 = peg$parseattrName();
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parseattrOps();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  s5 = peg$parsestring();
+                  if (s5 === peg$FAILED) {
+                    s5 = peg$parsenumber();
+                    if (s5 === peg$FAILED) {
+                      s5 = peg$parsepath();
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c46(s1, s3, s5);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            s1 = peg$parseattrName();
+            if (s1 !== peg$FAILED) {
+              s1 = peg$c47(s1);
+            }
+            s0 = s1;
+          }
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsestring() {
+        var s0, s1, s2, s3, s4, s5;
+        var key = peg$currPos * 36 + 17,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 34) {
+          s1 = peg$c48;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c49);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = [];
+          if (peg$c50.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            {
+              peg$fail(peg$c51);
+            }
+          }
+          if (s3 === peg$FAILED) {
+            s3 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 92) {
+              s4 = peg$c52;
+              peg$currPos++;
+            } else {
+              s4 = peg$FAILED;
+              {
+                peg$fail(peg$c53);
+              }
+            }
+            if (s4 !== peg$FAILED) {
+              if (input.length > peg$currPos) {
+                s5 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                {
+                  peg$fail(peg$c54);
+                }
+              }
+              if (s5 !== peg$FAILED) {
+                s4 = peg$c55(s4, s5);
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          }
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            if (peg$c50.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c51);
+              }
+            }
+            if (s3 === peg$FAILED) {
+              s3 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 92) {
+                s4 = peg$c52;
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                {
+                  peg$fail(peg$c53);
+                }
+              }
+              if (s4 !== peg$FAILED) {
+                if (input.length > peg$currPos) {
+                  s5 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c54);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s4 = peg$c55(s4, s5);
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 34) {
+              s3 = peg$c48;
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c49);
+              }
+            }
+            if (s3 !== peg$FAILED) {
+              s1 = peg$c56(s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        if (s0 === peg$FAILED) {
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 39) {
+            s1 = peg$c57;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c58);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            if (peg$c59.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c60);
+              }
+            }
+            if (s3 === peg$FAILED) {
+              s3 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 92) {
+                s4 = peg$c52;
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                {
+                  peg$fail(peg$c53);
+                }
+              }
+              if (s4 !== peg$FAILED) {
+                if (input.length > peg$currPos) {
+                  s5 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c54);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s4 = peg$c55(s4, s5);
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              if (peg$c59.test(input.charAt(peg$currPos))) {
+                s3 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c60);
+                }
+              }
+              if (s3 === peg$FAILED) {
+                s3 = peg$currPos;
+                if (input.charCodeAt(peg$currPos) === 92) {
+                  s4 = peg$c52;
+                  peg$currPos++;
+                } else {
+                  s4 = peg$FAILED;
+                  {
+                    peg$fail(peg$c53);
+                  }
+                }
+                if (s4 !== peg$FAILED) {
+                  if (input.length > peg$currPos) {
+                    s5 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c54);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s4 = peg$c55(s4, s5);
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 39) {
+                s3 = peg$c57;
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c58);
+                }
+              }
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c56(s2);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsenumber() {
+        var s0, s1, s2, s3;
+        var key = peg$currPos * 36 + 18,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        s1 = peg$currPos;
+        s2 = [];
+        if (peg$c61.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          {
+            peg$fail(peg$c62);
+          }
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          if (peg$c61.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            {
+              peg$fail(peg$c62);
+            }
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 46) {
+            s3 = peg$c43;
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            {
+              peg$fail(peg$c44);
+            }
+          }
+          if (s3 !== peg$FAILED) {
+            s2 = [s2, s3];
+            s1 = s2;
+          } else {
+            peg$currPos = s1;
+            s1 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s1;
+          s1 = peg$FAILED;
+        }
+        if (s1 === peg$FAILED) {
+          s1 = null;
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = [];
+          if (peg$c61.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            {
+              peg$fail(peg$c62);
+            }
+          }
+          if (s3 !== peg$FAILED) {
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              if (peg$c61.test(input.charAt(peg$currPos))) {
+                s3 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c62);
+                }
+              }
+            }
+          } else {
+            s2 = peg$FAILED;
+          }
+          if (s2 !== peg$FAILED) {
+            s1 = peg$c63(s1, s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsepath() {
+        var s0, s1;
+        var key = peg$currPos * 36 + 19,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        s1 = peg$parseidentifierName();
+        if (s1 !== peg$FAILED) {
+          s1 = peg$c64(s1);
+        }
+        s0 = s1;
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsetype() {
+        var s0, s1, s2, s3, s4, s5;
+        var key = peg$currPos * 36 + 20,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.substr(peg$currPos, 5) === peg$c65) {
+          s1 = peg$c65;
+          peg$currPos += 5;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c66);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parse_();
+          if (s2 !== peg$FAILED) {
+            s3 = [];
+            if (peg$c67.test(input.charAt(peg$currPos))) {
+              s4 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s4 = peg$FAILED;
+              {
+                peg$fail(peg$c68);
+              }
+            }
+            if (s4 !== peg$FAILED) {
+              while (s4 !== peg$FAILED) {
+                s3.push(s4);
+                if (peg$c67.test(input.charAt(peg$currPos))) {
+                  s4 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s4 = peg$FAILED;
+                  {
+                    peg$fail(peg$c68);
+                  }
+                }
+              }
+            } else {
+              s3 = peg$FAILED;
+            }
+            if (s3 !== peg$FAILED) {
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 41) {
+                  s5 = peg$c69;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c70);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s1 = peg$c71(s3);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseflags() {
+        var s0, s1;
+        var key = peg$currPos * 36 + 21,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = [];
+        if (peg$c72.test(input.charAt(peg$currPos))) {
+          s1 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c73);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          while (s1 !== peg$FAILED) {
+            s0.push(s1);
+            if (peg$c72.test(input.charAt(peg$currPos))) {
+              s1 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s1 = peg$FAILED;
+              {
+                peg$fail(peg$c73);
+              }
+            }
+          }
+        } else {
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseregex() {
+        var s0, s1, s2, s3, s4;
+        var key = peg$currPos * 36 + 22,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 47) {
+          s1 = peg$c74;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c75);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = [];
+          s3 = peg$parsere_character_class();
+          if (s3 === peg$FAILED) {
+            s3 = peg$parsere_escape();
+            if (s3 === peg$FAILED) {
+              s3 = peg$parsere_chars();
+            }
+          }
+          if (s3 !== peg$FAILED) {
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              s3 = peg$parsere_character_class();
+              if (s3 === peg$FAILED) {
+                s3 = peg$parsere_escape();
+                if (s3 === peg$FAILED) {
+                  s3 = peg$parsere_chars();
+                }
+              }
+            }
+          } else {
+            s2 = peg$FAILED;
+          }
+          if (s2 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 47) {
+              s3 = peg$c74;
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c75);
+              }
+            }
+            if (s3 !== peg$FAILED) {
+              s4 = peg$parseflags();
+              if (s4 === peg$FAILED) {
+                s4 = null;
+              }
+              if (s4 !== peg$FAILED) {
+                s1 = peg$c76(s2, s4);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsere_character_class() {
+        var s0, s1, s2, s3;
+        var key = peg$currPos * 36 + 23,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 91) {
+          s1 = peg$c31;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c32);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = [];
+          if (peg$c77.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            {
+              peg$fail(peg$c78);
+            }
+          }
+          if (s3 === peg$FAILED) {
+            s3 = peg$parsere_escape();
+          }
+          if (s3 !== peg$FAILED) {
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              if (peg$c77.test(input.charAt(peg$currPos))) {
+                s3 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c78);
+                }
+              }
+              if (s3 === peg$FAILED) {
+                s3 = peg$parsere_escape();
+              }
+            }
+          } else {
+            s2 = peg$FAILED;
+          }
+          if (s2 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 93) {
+              s3 = peg$c33;
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c34);
+              }
+            }
+            if (s3 !== peg$FAILED) {
+              s1 = peg$c79(s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsere_escape() {
+        var s0, s1, s2;
+        var key = peg$currPos * 36 + 24,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 92) {
+          s1 = peg$c52;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c53);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          if (input.length > peg$currPos) {
+            s2 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            {
+              peg$fail(peg$c54);
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            s1 = peg$c80(s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsere_chars() {
+        var s0, s1, s2;
+        var key = peg$currPos * 36 + 25,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        s1 = [];
+        if (peg$c81.test(input.charAt(peg$currPos))) {
+          s2 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          {
+            peg$fail(peg$c82);
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          while (s2 !== peg$FAILED) {
+            s1.push(s2);
+            if (peg$c81.test(input.charAt(peg$currPos))) {
+              s2 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s2 = peg$FAILED;
+              {
+                peg$fail(peg$c82);
+              }
+            }
+          }
+        } else {
+          s1 = peg$FAILED;
+        }
+        if (s1 !== peg$FAILED) {
+          s1 = peg$c83(s1);
+        }
+        s0 = s1;
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsefield() {
+        var s0, s1, s2, s3, s4, s5, s6;
+        var key = peg$currPos * 36 + 26,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 46) {
+          s1 = peg$c43;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c44);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parseidentifierName();
+          if (s2 !== peg$FAILED) {
+            s3 = [];
+            s4 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 46) {
+              s5 = peg$c43;
+              peg$currPos++;
+            } else {
+              s5 = peg$FAILED;
+              {
+                peg$fail(peg$c44);
+              }
+            }
+            if (s5 !== peg$FAILED) {
+              s6 = peg$parseidentifierName();
+              if (s6 !== peg$FAILED) {
+                s5 = [s5, s6];
+                s4 = s5;
+              } else {
+                peg$currPos = s4;
+                s4 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s4;
+              s4 = peg$FAILED;
+            }
+            while (s4 !== peg$FAILED) {
+              s3.push(s4);
+              s4 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 46) {
+                s5 = peg$c43;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                {
+                  peg$fail(peg$c44);
+                }
+              }
+              if (s5 !== peg$FAILED) {
+                s6 = peg$parseidentifierName();
+                if (s6 !== peg$FAILED) {
+                  s5 = [s5, s6];
+                  s4 = s5;
+                } else {
+                  peg$currPos = s4;
+                  s4 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s4;
+                s4 = peg$FAILED;
+              }
+            }
+            if (s3 !== peg$FAILED) {
+              s1 = peg$c84(s2, s3);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsenegation() {
+        var s0, s1, s2, s3, s4, s5;
+        var key = peg$currPos * 36 + 27,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.substr(peg$currPos, 5) === peg$c85) {
+          s1 = peg$c85;
+          peg$currPos += 5;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c86);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parse_();
+          if (s2 !== peg$FAILED) {
+            s3 = peg$parseselectors();
+            if (s3 !== peg$FAILED) {
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 41) {
+                  s5 = peg$c69;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c70);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s1 = peg$c87(s3);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsematches() {
+        var s0, s1, s2, s3, s4, s5;
+        var key = peg$currPos * 36 + 28,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.substr(peg$currPos, 9) === peg$c88) {
+          s1 = peg$c88;
+          peg$currPos += 9;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c89);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parse_();
+          if (s2 !== peg$FAILED) {
+            s3 = peg$parseselectors();
+            if (s3 !== peg$FAILED) {
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 41) {
+                  s5 = peg$c69;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c70);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s1 = peg$c90(s3);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseis() {
+        var s0, s1, s2, s3, s4, s5;
+        var key = peg$currPos * 36 + 29,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.substr(peg$currPos, 4) === peg$c91) {
+          s1 = peg$c91;
+          peg$currPos += 4;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c92);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parse_();
+          if (s2 !== peg$FAILED) {
+            s3 = peg$parseselectors();
+            if (s3 !== peg$FAILED) {
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 41) {
+                  s5 = peg$c69;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c70);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s1 = peg$c90(s3);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsehas() {
+        var s0, s1, s2, s3, s4, s5;
+        var key = peg$currPos * 36 + 30,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.substr(peg$currPos, 5) === peg$c93) {
+          s1 = peg$c93;
+          peg$currPos += 5;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c94);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parse_();
+          if (s2 !== peg$FAILED) {
+            s3 = peg$parsehasSelectors();
+            if (s3 !== peg$FAILED) {
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 41) {
+                  s5 = peg$c69;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c70);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s1 = peg$c95(s3);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsefirstChild() {
+        var s0, s1;
+        var key = peg$currPos * 36 + 31,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.substr(peg$currPos, 12) === peg$c96) {
+          s1 = peg$c96;
+          peg$currPos += 12;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c97);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s1 = peg$c98();
+        }
+        s0 = s1;
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parselastChild() {
+        var s0, s1;
+        var key = peg$currPos * 36 + 32,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.substr(peg$currPos, 11) === peg$c99) {
+          s1 = peg$c99;
+          peg$currPos += 11;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c100);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s1 = peg$c101();
+        }
+        s0 = s1;
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsenthChild() {
+        var s0, s1, s2, s3, s4, s5;
+        var key = peg$currPos * 36 + 33,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.substr(peg$currPos, 11) === peg$c102) {
+          s1 = peg$c102;
+          peg$currPos += 11;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c103);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parse_();
+          if (s2 !== peg$FAILED) {
+            s3 = [];
+            if (peg$c61.test(input.charAt(peg$currPos))) {
+              s4 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s4 = peg$FAILED;
+              {
+                peg$fail(peg$c62);
+              }
+            }
+            if (s4 !== peg$FAILED) {
+              while (s4 !== peg$FAILED) {
+                s3.push(s4);
+                if (peg$c61.test(input.charAt(peg$currPos))) {
+                  s4 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s4 = peg$FAILED;
+                  {
+                    peg$fail(peg$c62);
+                  }
+                }
+              }
+            } else {
+              s3 = peg$FAILED;
+            }
+            if (s3 !== peg$FAILED) {
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 41) {
+                  s5 = peg$c69;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c70);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s1 = peg$c104(s3);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parsenthLastChild() {
+        var s0, s1, s2, s3, s4, s5;
+        var key = peg$currPos * 36 + 34,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.substr(peg$currPos, 16) === peg$c105) {
+          s1 = peg$c105;
+          peg$currPos += 16;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c106);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parse_();
+          if (s2 !== peg$FAILED) {
+            s3 = [];
+            if (peg$c61.test(input.charAt(peg$currPos))) {
+              s4 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s4 = peg$FAILED;
+              {
+                peg$fail(peg$c62);
+              }
+            }
+            if (s4 !== peg$FAILED) {
+              while (s4 !== peg$FAILED) {
+                s3.push(s4);
+                if (peg$c61.test(input.charAt(peg$currPos))) {
+                  s4 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s4 = peg$FAILED;
+                  {
+                    peg$fail(peg$c62);
+                  }
+                }
+              }
+            } else {
+              s3 = peg$FAILED;
+            }
+            if (s3 !== peg$FAILED) {
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 41) {
+                  s5 = peg$c69;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c70);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s1 = peg$c107(s3);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function peg$parseclass() {
+        var s0, s1, s2;
+        var key = peg$currPos * 36 + 35,
+          cached = peg$resultsCache[key];
+        if (cached) {
+          peg$currPos = cached.nextPos;
+          return cached.result;
+        }
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 58) {
+          s1 = peg$c108;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          {
+            peg$fail(peg$c109);
+          }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parseidentifierName();
+          if (s2 !== peg$FAILED) {
+            s1 = peg$c110(s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        peg$resultsCache[key] = {
+          nextPos: peg$currPos,
+          result: s0
+        };
+        return s0;
+      }
+      function nth(n) {
+        return {
+          type: 'nth-child',
+          index: {
+            type: 'literal',
+            value: n
+          }
+        };
+      }
+      function nthLast(n) {
+        return {
+          type: 'nth-last-child',
+          index: {
+            type: 'literal',
+            value: n
+          }
+        };
+      }
+      function strUnescape(s) {
+        return s.replace(/\\(.)/g, function (match, ch) {
+          switch (ch) {
+            case 'b':
+              return '\b';
+            case 'f':
+              return '\f';
+            case 'n':
+              return '\n';
+            case 'r':
+              return '\r';
+            case 't':
+              return '\t';
+            case 'v':
+              return '\v';
+            default:
+              return ch;
+          }
+        });
+      }
+      peg$result = peg$startRuleFunction();
+      if (peg$result !== peg$FAILED && peg$currPos === input.length) {
+        return peg$result;
+      } else {
+        if (peg$result !== peg$FAILED && peg$currPos < input.length) {
+          peg$fail(peg$endExpectation());
+        }
+        throw peg$buildStructuredError(peg$maxFailExpected, peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null, peg$maxFailPos < input.length ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1) : peg$computeLocation(peg$maxFailPos, peg$maxFailPos));
+      }
+    }
+    return {
+      SyntaxError: peg$SyntaxError,
+      parse: peg$parse
+    };
+  });
+});
+
+/**
+* @typedef {"LEFT_SIDE"|"RIGHT_SIDE"} Side
+*/
+
+var LEFT_SIDE = 'LEFT_SIDE';
+var RIGHT_SIDE = 'RIGHT_SIDE';
+
+/**
+ * @external AST
+ * @see https://esprima.readthedocs.io/en/latest/syntax-tree-format.html
+ */
+
+/**
+ * One of the rules of `grammar.pegjs`
+ * @typedef {PlainObject} SelectorAST
+ * @see grammar.pegjs
+*/
+
+/**
+ * The `sequence` production of `grammar.pegjs`
+ * @typedef {PlainObject} SelectorSequenceAST
+*/
+
+/**
+ * Get the value of a property which may be multiple levels down
+ * in the object.
+ * @param {?PlainObject} obj
+ * @param {string[]} keys
+ * @returns {undefined|boolean|string|number|external:AST}
+ */
+function getPath(obj, keys) {
+  for (var i = 0; i < keys.length; ++i) {
+    if (obj == null) {
+      return obj;
+    }
+    obj = obj[keys[i]];
+  }
+  return obj;
+}
+
+/**
+ * Determine whether `node` can be reached by following `path`,
+ * starting at `ancestor`.
+ * @param {?external:AST} node
+ * @param {?external:AST} ancestor
+ * @param {string[]} path
+ * @param {Integer} fromPathIndex
+ * @returns {boolean}
+ */
+function inPath(node, ancestor, path, fromPathIndex) {
+  var current = ancestor;
+  for (var i = fromPathIndex; i < path.length; ++i) {
+    if (current == null) {
+      return false;
+    }
+    var field = current[path[i]];
+    if (Array.isArray(field)) {
+      for (var k = 0; k < field.length; ++k) {
+        if (inPath(node, field[k], path, i + 1)) {
+          return true;
+        }
+      }
+      return false;
+    }
+    current = field;
+  }
+  return node === current;
+}
+
+/**
+ * A generated matcher function for a selector.
+ * @callback SelectorMatcher
+ * @param {?SelectorAST} selector
+ * @param {external:AST[]} [ancestry=[]]
+ * @param {ESQueryOptions} [options]
+ * @returns {void}
+*/
+
+/**
+ * A WeakMap for holding cached matcher functions for selectors.
+ * @type {WeakMap<SelectorAST, SelectorMatcher>}
+*/
+var MATCHER_CACHE = typeof WeakMap === 'function' ? new WeakMap() : null;
+
+/**
+ * Look up a matcher function for `selector` in the cache.
+ * If it does not exist, generate it with `generateMatcher` and add it to the cache.
+ * In engines without WeakMap, the caching is skipped and matchers are generated with every call.
+ * @param {?SelectorAST} selector
+ * @returns {SelectorMatcher}
+ */
+function getMatcher(selector) {
+  if (selector == null) {
+    return function () {
+      return true;
+    };
+  }
+  if (MATCHER_CACHE != null) {
+    var matcher = MATCHER_CACHE.get(selector);
+    if (matcher != null) {
+      return matcher;
+    }
+    matcher = generateMatcher(selector);
+    MATCHER_CACHE.set(selector, matcher);
+    return matcher;
+  }
+  return generateMatcher(selector);
+}
+
+/**
+ * Create a matcher function for `selector`,
+ * @param {?SelectorAST} selector
+ * @returns {SelectorMatcher}
+ */
+function generateMatcher(selector) {
+  switch (selector.type) {
+    case 'wildcard':
+      return function () {
+        return true;
+      };
+    case 'identifier':
+      {
+        var value = selector.value.toLowerCase();
+        return function (node, ancestry, options) {
+          var nodeTypeKey = options && options.nodeTypeKey || 'type';
+          return value === node[nodeTypeKey].toLowerCase();
+        };
+      }
+    case 'exactNode':
+      return function (node, ancestry) {
+        return ancestry.length === 0;
+      };
+    case 'field':
+      {
+        var path = selector.name.split('.');
+        return function (node, ancestry) {
+          var ancestor = ancestry[path.length - 1];
+          return inPath(node, ancestor, path, 0);
+        };
+      }
+    case 'matches':
+      {
+        var matchers = selector.selectors.map(getMatcher);
+        return function (node, ancestry, options) {
+          for (var i = 0; i < matchers.length; ++i) {
+            if (matchers[i](node, ancestry, options)) {
+              return true;
+            }
+          }
+          return false;
+        };
+      }
+    case 'compound':
+      {
+        var _matchers = selector.selectors.map(getMatcher);
+        return function (node, ancestry, options) {
+          for (var i = 0; i < _matchers.length; ++i) {
+            if (!_matchers[i](node, ancestry, options)) {
+              return false;
+            }
+          }
+          return true;
+        };
+      }
+    case 'not':
+      {
+        var _matchers2 = selector.selectors.map(getMatcher);
+        return function (node, ancestry, options) {
+          for (var i = 0; i < _matchers2.length; ++i) {
+            if (_matchers2[i](node, ancestry, options)) {
+              return false;
+            }
+          }
+          return true;
+        };
+      }
+    case 'has':
+      {
+        var _matchers3 = selector.selectors.map(getMatcher);
+        return function (node, ancestry, options) {
+          var result = false;
+          var a = [];
+          estraverse.traverse(node, {
+            enter: function enter(node, parent) {
+              if (parent != null) {
+                a.unshift(parent);
+              }
+              for (var i = 0; i < _matchers3.length; ++i) {
+                if (_matchers3[i](node, a, options)) {
+                  result = true;
+                  this["break"]();
+                  return;
+                }
+              }
+            },
+            leave: function leave() {
+              a.shift();
+            },
+            keys: options && options.visitorKeys,
+            fallback: options && options.fallback || 'iteration'
+          });
+          return result;
+        };
+      }
+    case 'child':
+      {
+        var left = getMatcher(selector.left);
+        var right = getMatcher(selector.right);
+        return function (node, ancestry, options) {
+          if (ancestry.length > 0 && right(node, ancestry, options)) {
+            return left(ancestry[0], ancestry.slice(1), options);
+          }
+          return false;
+        };
+      }
+    case 'descendant':
+      {
+        var _left = getMatcher(selector.left);
+        var _right = getMatcher(selector.right);
+        return function (node, ancestry, options) {
+          if (_right(node, ancestry, options)) {
+            for (var i = 0, l = ancestry.length; i < l; ++i) {
+              if (_left(ancestry[i], ancestry.slice(i + 1), options)) {
+                return true;
+              }
+            }
+          }
+          return false;
+        };
+      }
+    case 'attribute':
+      {
+        var _path = selector.name.split('.');
+        switch (selector.operator) {
+          case void 0:
+            return function (node) {
+              return getPath(node, _path) != null;
+            };
+          case '=':
+            switch (selector.value.type) {
+              case 'regexp':
+                return function (node) {
+                  var p = getPath(node, _path);
+                  return typeof p === 'string' && selector.value.value.test(p);
+                };
+              case 'literal':
+                {
+                  var literal = "".concat(selector.value.value);
+                  return function (node) {
+                    return literal === "".concat(getPath(node, _path));
+                  };
+                }
+              case 'type':
+                return function (node) {
+                  return selector.value.value === _typeof(getPath(node, _path));
+                };
+            }
+            throw new Error("Unknown selector value type: ".concat(selector.value.type));
+          case '!=':
+            switch (selector.value.type) {
+              case 'regexp':
+                return function (node) {
+                  return !selector.value.value.test(getPath(node, _path));
+                };
+              case 'literal':
+                {
+                  var _literal = "".concat(selector.value.value);
+                  return function (node) {
+                    return _literal !== "".concat(getPath(node, _path));
+                  };
+                }
+              case 'type':
+                return function (node) {
+                  return selector.value.value !== _typeof(getPath(node, _path));
+                };
+            }
+            throw new Error("Unknown selector value type: ".concat(selector.value.type));
+          case '<=':
+            return function (node) {
+              return getPath(node, _path) <= selector.value.value;
+            };
+          case '<':
+            return function (node) {
+              return getPath(node, _path) < selector.value.value;
+            };
+          case '>':
+            return function (node) {
+              return getPath(node, _path) > selector.value.value;
+            };
+          case '>=':
+            return function (node) {
+              return getPath(node, _path) >= selector.value.value;
+            };
+        }
+        throw new Error("Unknown operator: ".concat(selector.operator));
+      }
+    case 'sibling':
+      {
+        var _left2 = getMatcher(selector.left);
+        var _right2 = getMatcher(selector.right);
+        return function (node, ancestry, options) {
+          return _right2(node, ancestry, options) && sibling(node, _left2, ancestry, LEFT_SIDE, options) || selector.left.subject && _left2(node, ancestry, options) && sibling(node, _right2, ancestry, RIGHT_SIDE, options);
+        };
+      }
+    case 'adjacent':
+      {
+        var _left3 = getMatcher(selector.left);
+        var _right3 = getMatcher(selector.right);
+        return function (node, ancestry, options) {
+          return _right3(node, ancestry, options) && adjacent(node, _left3, ancestry, LEFT_SIDE, options) || selector.right.subject && _left3(node, ancestry, options) && adjacent(node, _right3, ancestry, RIGHT_SIDE, options);
+        };
+      }
+    case 'nth-child':
+      {
+        var nth = selector.index.value;
+        var _right4 = getMatcher(selector.right);
+        return function (node, ancestry, options) {
+          return _right4(node, ancestry, options) && nthChild(node, ancestry, nth, options);
+        };
+      }
+    case 'nth-last-child':
+      {
+        var _nth = -selector.index.value;
+        var _right5 = getMatcher(selector.right);
+        return function (node, ancestry, options) {
+          return _right5(node, ancestry, options) && nthChild(node, ancestry, _nth, options);
+        };
+      }
+    case 'class':
+      {
+        var name = selector.name.toLowerCase();
+        return function (node, ancestry, options) {
+          if (options && options.matchClass) {
+            return options.matchClass(selector.name, node, ancestry);
+          }
+          if (options && options.nodeTypeKey) return false;
+          switch (name) {
+            case 'statement':
+              if (node.type.slice(-9) === 'Statement') return true;
+            // fallthrough: interface Declaration <: Statement { }
+            case 'declaration':
+              return node.type.slice(-11) === 'Declaration';
+            case 'pattern':
+              if (node.type.slice(-7) === 'Pattern') return true;
+            // fallthrough: interface Expression <: Node, Pattern { }
+            case 'expression':
+              return node.type.slice(-10) === 'Expression' || node.type.slice(-7) === 'Literal' || node.type === 'Identifier' && (ancestry.length === 0 || ancestry[0].type !== 'MetaProperty') || node.type === 'MetaProperty';
+            case 'function':
+              return node.type === 'FunctionDeclaration' || node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression';
+          }
+          throw new Error("Unknown class name: ".concat(selector.name));
+        };
+      }
+  }
+  throw new Error("Unknown selector type: ".concat(selector.type));
+}
+
+/**
+ * @callback TraverseOptionFallback
+ * @param {external:AST} node The given node.
+ * @returns {string[]} An array of visitor keys for the given node.
+ */
+
+/**
+ * @callback ClassMatcher
+ * @param {string} className The name of the class to match.
+ * @param {external:AST} node The node to match against.
+ * @param {Array<external:AST>} ancestry The ancestry of the node.
+ * @returns {boolean} True if the node matches the class, false if not.
+ */
+
+/**
+ * @typedef {object} ESQueryOptions
+ * @property {string} [nodeTypeKey="type"] By passing `nodeTypeKey`, we can allow other ASTs to use ESQuery.
+ * @property { { [nodeType: string]: string[] } } [visitorKeys] By passing `visitorKeys` mapping, we can extend the properties of the nodes that traverse the node.
+ * @property {TraverseOptionFallback} [fallback] By passing `fallback` option, we can control the properties of traversing nodes when encountering unknown nodes.
+ * @property {ClassMatcher} [matchClass] By passing `matchClass` option, we can customize the interpretation of classes.
+ */
+
+/**
+ * Given a `node` and its ancestors, determine if `node` is matched
+ * by `selector`.
+ * @param {?external:AST} node
+ * @param {?SelectorAST} selector
+ * @param {external:AST[]} [ancestry=[]]
+ * @param {ESQueryOptions} [options]
+ * @throws {Error} Unknowns (operator, class name, selector type, or
+ * selector value type)
+ * @returns {boolean}
+ */
+function matches(node, selector, ancestry, options) {
+  if (!selector) {
+    return true;
+  }
+  if (!node) {
+    return false;
+  }
+  if (!ancestry) {
+    ancestry = [];
+  }
+  return getMatcher(selector)(node, ancestry, options);
+}
+
+/**
+ * Get visitor keys of a given node.
+ * @param {external:AST} node The AST node to get keys.
+ * @param {ESQueryOptions|undefined} options
+ * @returns {string[]} Visitor keys of the node.
+ */
+function getVisitorKeys(node, options) {
+  var nodeTypeKey = options && options.nodeTypeKey || 'type';
+  var nodeType = node[nodeTypeKey];
+  if (options && options.visitorKeys && options.visitorKeys[nodeType]) {
+    return options.visitorKeys[nodeType];
+  }
+  if (estraverse.VisitorKeys[nodeType]) {
+    return estraverse.VisitorKeys[nodeType];
+  }
+  if (options && typeof options.fallback === 'function') {
+    return options.fallback(node);
+  }
+  // 'iteration' fallback
+  return Object.keys(node).filter(function (key) {
+    return key !== nodeTypeKey;
+  });
+}
+
+/**
+ * Check whether the given value is an ASTNode or not.
+ * @param {any} node The value to check.
+ * @param {ESQueryOptions|undefined} options The options to use.
+ * @returns {boolean} `true` if the value is an ASTNode.
+ */
+function isNode(node, options) {
+  var nodeTypeKey = options && options.nodeTypeKey || 'type';
+  return node !== null && _typeof(node) === 'object' && typeof node[nodeTypeKey] === 'string';
+}
+
+/**
+ * Determines if the given node has a sibling that matches the
+ * given selector matcher.
+ * @param {external:AST} node
+ * @param {SelectorMatcher} matcher
+ * @param {external:AST[]} ancestry
+ * @param {Side} side
+ * @param {ESQueryOptions|undefined} options
+ * @returns {boolean}
+ */
+function sibling(node, matcher, ancestry, side, options) {
+  var _ancestry = _slicedToArray(ancestry, 1),
+    parent = _ancestry[0];
+  if (!parent) {
+    return false;
+  }
+  var keys = getVisitorKeys(parent, options);
+  for (var i = 0; i < keys.length; ++i) {
+    var listProp = parent[keys[i]];
+    if (Array.isArray(listProp)) {
+      var startIndex = listProp.indexOf(node);
+      if (startIndex < 0) {
+        continue;
+      }
+      var lowerBound = void 0,
+        upperBound = void 0;
+      if (side === LEFT_SIDE) {
+        lowerBound = 0;
+        upperBound = startIndex;
+      } else {
+        lowerBound = startIndex + 1;
+        upperBound = listProp.length;
+      }
+      for (var k = lowerBound; k < upperBound; ++k) {
+        if (isNode(listProp[k], options) && matcher(listProp[k], ancestry, options)) {
+          return true;
+        }
+      }
+    }
+  }
+  return false;
+}
+
+/**
+ * Determines if the given node has an adjacent sibling that matches
+ * the given selector matcher.
+ * @param {external:AST} node
+ * @param {SelectorMatcher} matcher
+ * @param {external:AST[]} ancestry
+ * @param {Side} side
+ * @param {ESQueryOptions|undefined} options
+ * @returns {boolean}
+ */
+function adjacent(node, matcher, ancestry, side, options) {
+  var _ancestry2 = _slicedToArray(ancestry, 1),
+    parent = _ancestry2[0];
+  if (!parent) {
+    return false;
+  }
+  var keys = getVisitorKeys(parent, options);
+  for (var i = 0; i < keys.length; ++i) {
+    var listProp = parent[keys[i]];
+    if (Array.isArray(listProp)) {
+      var idx = listProp.indexOf(node);
+      if (idx < 0) {
+        continue;
+      }
+      if (side === LEFT_SIDE && idx > 0 && isNode(listProp[idx - 1], options) && matcher(listProp[idx - 1], ancestry, options)) {
+        return true;
+      }
+      if (side === RIGHT_SIDE && idx < listProp.length - 1 && isNode(listProp[idx + 1], options) && matcher(listProp[idx + 1], ancestry, options)) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+/**
+ * Determines if the given node is the `nth` child.
+ * If `nth` is negative then the position is counted
+ * from the end of the list of children.
+ * @param {external:AST} node
+ * @param {external:AST[]} ancestry
+ * @param {Integer} nth
+ * @param {ESQueryOptions|undefined} options
+ * @returns {boolean}
+ */
+function nthChild(node, ancestry, nth, options) {
+  if (nth === 0) {
+    return false;
+  }
+  var _ancestry3 = _slicedToArray(ancestry, 1),
+    parent = _ancestry3[0];
+  if (!parent) {
+    return false;
+  }
+  var keys = getVisitorKeys(parent, options);
+  for (var i = 0; i < keys.length; ++i) {
+    var listProp = parent[keys[i]];
+    if (Array.isArray(listProp)) {
+      var idx = nth < 0 ? listProp.length + nth : nth - 1;
+      if (idx >= 0 && idx < listProp.length && listProp[idx] === node) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+/**
+ * For each selector node marked as a subject, find the portion of the
+ * selector that the subject must match.
+ * @param {SelectorAST} selector
+ * @param {SelectorAST} [ancestor] Defaults to `selector`
+ * @returns {SelectorAST[]}
+ */
+function subjects(selector, ancestor) {
+  if (selector == null || _typeof(selector) != 'object') {
+    return [];
+  }
+  if (ancestor == null) {
+    ancestor = selector;
+  }
+  var results = selector.subject ? [ancestor] : [];
+  var keys = Object.keys(selector);
+  for (var i = 0; i < keys.length; ++i) {
+    var p = keys[i];
+    var sel = selector[p];
+    results.push.apply(results, _toConsumableArray(subjects(sel, p === 'left' ? sel : ancestor)));
+  }
+  return results;
+}
+
+/**
+* @callback TraverseVisitor
+* @param {?external:AST} node
+* @param {?external:AST} parent
+* @param {external:AST[]} ancestry
+*/
+
+/**
+ * From a JS AST and a selector AST, collect all JS AST nodes that
+ * match the selector.
+ * @param {external:AST} ast
+ * @param {?SelectorAST} selector
+ * @param {TraverseVisitor} visitor
+ * @param {ESQueryOptions} [options]
+ * @returns {external:AST[]}
+ */
+function traverse(ast, selector, visitor, options) {
+  if (!selector) {
+    return;
+  }
+  var ancestry = [];
+  var matcher = getMatcher(selector);
+  var altSubjects = subjects(selector).map(getMatcher);
+  estraverse.traverse(ast, {
+    enter: function enter(node, parent) {
+      if (parent != null) {
+        ancestry.unshift(parent);
+      }
+      if (matcher(node, ancestry, options)) {
+        if (altSubjects.length) {
+          for (var i = 0, l = altSubjects.length; i < l; ++i) {
+            if (altSubjects[i](node, ancestry, options)) {
+              visitor(node, parent, ancestry);
+            }
+            for (var k = 0, m = ancestry.length; k < m; ++k) {
+              var succeedingAncestry = ancestry.slice(k + 1);
+              if (altSubjects[i](ancestry[k], succeedingAncestry, options)) {
+                visitor(ancestry[k], parent, succeedingAncestry);
+              }
+            }
+          }
+        } else {
+          visitor(node, parent, ancestry);
+        }
+      }
+    },
+    leave: function leave() {
+      ancestry.shift();
+    },
+    keys: options && options.visitorKeys,
+    fallback: options && options.fallback || 'iteration'
+  });
+}
+
+/**
+ * From a JS AST and a selector AST, collect all JS AST nodes that
+ * match the selector.
+ * @param {external:AST} ast
+ * @param {?SelectorAST} selector
+ * @param {ESQueryOptions} [options]
+ * @returns {external:AST[]}
+ */
+function match(ast, selector, options) {
+  var results = [];
+  traverse(ast, selector, function (node) {
+    results.push(node);
+  }, options);
+  return results;
+}
+
+/**
+ * Parse a selector string and return its AST.
+ * @param {string} selector
+ * @returns {SelectorAST}
+ */
+function parse(selector) {
+  return parser.parse(selector);
+}
+
+/**
+ * Query the code AST using the selector string.
+ * @param {external:AST} ast
+ * @param {string} selector
+ * @param {ESQueryOptions} [options]
+ * @returns {external:AST[]}
+ */
+function query(ast, selector, options) {
+  return match(ast, parse(selector), options);
+}
+query.parse = parse;
+query.match = match;
+query.traverse = traverse;
+query.matches = matches;
+query.query = query;
+
+export default query;
Index: frontend/node_modules/esquery/dist/esquery.esm.min.js
===================================================================
--- frontend/node_modules/esquery/dist/esquery.esm.min.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/dist/esquery.esm.min.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,2 @@
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c(e){if(null==e)return function(){return!0};if(null!=l){var t=l.get(e);return null!=t||(t=f(e),l.set(e,t)),t}return f(e)}function f(e){switch(e.type){case"wildcard":return function(){return!0};case"identifier":var t=e.value.toLowerCase();return function(e,r,n){var o=n&&n.nodeTypeKey||"type";return t===e[o].toLowerCase()};case"exactNode":return function(e,t){return 0===t.length};case"field":var r=e.name.split(".");return function(e,t){return function e(t,r,n,o){for(var a=r,i=o;i<n.length;++i){if(null==a)return!1;var s=a[n[i]];if(Array.isArray(s)){for(var u=0;u<s.length;++u)if(e(t,s[u],n,i+1))return!0;return!1}a=s}return t===a}(e,t[r.length-1],r,0)};case"matches":var o=e.selectors.map(c);return function(e,t,r){for(var n=0;n<o.length;++n)if(o[n](e,t,r))return!0;return!1};case"compound":var a=e.selectors.map(c);return function(e,t,r){for(var n=0;n<a.length;++n)if(!a[n](e,t,r))return!1;return!0};case"not":var s=e.selectors.map(c);return function(e,t,r){for(var n=0;n<s.length;++n)if(s[n](e,t,r))return!1;return!0};case"has":var l=e.selectors.map(c);return function(e,t,r){var n=!1,o=[];return i.traverse(e,{enter:function(e,t){null!=t&&o.unshift(t);for(var a=0;a<l.length;++a)if(l[a](e,o,r))return n=!0,void this.break()},leave:function(){o.shift()},keys:r&&r.visitorKeys,fallback:r&&r.fallback||"iteration"}),n};case"child":var f=c(e.left),p=c(e.right);return function(e,t,r){return!!(t.length>0&&p(e,t,r))&&f(t[0],t.slice(1),r)};case"descendant":var h=c(e.left),x=c(e.right);return function(e,t,r){if(x(e,t,r))for(var n=0,o=t.length;n<o;++n)if(h(t[n],t.slice(n+1),r))return!0;return!1};case"attribute":var v=e.name.split(".");switch(e.operator){case void 0:return function(e){return null!=u(e,v)};case"=":switch(e.value.type){case"regexp":return function(t){var r=u(t,v);return"string"==typeof r&&e.value.value.test(r)};case"literal":var g="".concat(e.value.value);return function(e){return g==="".concat(u(e,v))};case"type":return function(t){return e.value.value===n(u(t,v))}}throw new Error("Unknown selector value type: ".concat(e.value.type));case"!=":switch(e.value.type){case"regexp":return function(t){return!e.value.value.test(u(t,v))};case"literal":var A="".concat(e.value.value);return function(e){return A!=="".concat(u(e,v))};case"type":return function(t){return e.value.value!==n(u(t,v))}}throw new Error("Unknown selector value type: ".concat(e.value.type));case"<=":return function(t){return u(t,v)<=e.value.value};case"<":return function(t){return u(t,v)<e.value.value};case">":return function(t){return u(t,v)>e.value.value};case">=":return function(t){return u(t,v)>=e.value.value}}throw new Error("Unknown operator: ".concat(e.operator));case"sibling":var E=c(e.left),b=c(e.right);return function(t,r,n){return b(t,r,n)&&y(t,E,r,"LEFT_SIDE",n)||e.left.subject&&E(t,r,n)&&y(t,b,r,"RIGHT_SIDE",n)};case"adjacent":var S=c(e.left),_=c(e.right);return function(t,r,n){return _(t,r,n)&&d(t,S,r,"LEFT_SIDE",n)||e.right.subject&&S(t,r,n)&&d(t,_,r,"RIGHT_SIDE",n)};case"nth-child":var C=e.index.value,P=c(e.right);return function(e,t,r){return P(e,t,r)&&m(e,t,C,r)};case"nth-last-child":var w=-e.index.value,k=c(e.right);return function(e,t,r){return k(e,t,r)&&m(e,t,w,r)};case"class":var D=e.name.toLowerCase();return function(t,r,n){if(n&&n.matchClass)return n.matchClass(e.name,t,r);if(n&&n.nodeTypeKey)return!1;switch(D){case"statement":if("Statement"===t.type.slice(-9))return!0;case"declaration":return"Declaration"===t.type.slice(-11);case"pattern":if("Pattern"===t.type.slice(-7))return!0;case"expression":return"Expression"===t.type.slice(-10)||"Literal"===t.type.slice(-7)||"Identifier"===t.type&&(0===r.length||"MetaProperty"!==r[0].type)||"MetaProperty"===t.type;case"function":return"FunctionDeclaration"===t.type||"FunctionExpression"===t.type||"ArrowFunctionExpression"===t.type}throw new Error("Unknown class name: ".concat(e.name))}}throw new Error("Unknown selector type: ".concat(e.type))}function p(e,t){var r=t&&t.nodeTypeKey||"type",n=e[r];return t&&t.visitorKeys&&t.visitorKeys[n]?t.visitorKeys[n]:i.VisitorKeys[n]?i.VisitorKeys[n]:t&&"function"==typeof t.fallback?t.fallback(e):Object.keys(e).filter((function(e){return e!==r}))}function h(e,t){var r=t&&t.nodeTypeKey||"type";return null!==e&&"object"===n(e)&&"string"==typeof e[r]}function y(e,r,n,o,a){var i=t(n,1)[0];if(!i)return!1;for(var s=p(i,a),u=0;u<s.length;++u){var l=i[s[u]];if(Array.isArray(l)){var c=l.indexOf(e);if(c<0)continue;var f=void 0,y=void 0;"LEFT_SIDE"===o?(f=0,y=c):(f=c+1,y=l.length);for(var d=f;d<y;++d)if(h(l[d],a)&&r(l[d],n,a))return!0}}return!1}function d(e,r,n,o,a){var i=t(n,1)[0];if(!i)return!1;for(var s=p(i,a),u=0;u<s.length;++u){var l=i[s[u]];if(Array.isArray(l)){var c=l.indexOf(e);if(c<0)continue;if("LEFT_SIDE"===o&&c>0&&h(l[c-1],a)&&r(l[c-1],n,a))return!0;if("RIGHT_SIDE"===o&&c<l.length-1&&h(l[c+1],a)&&r(l[c+1],n,a))return!0}}return!1}function m(e,r,n,o){if(0===n)return!1;var a=t(r,1)[0];if(!a)return!1;for(var i=p(a,o),s=0;s<i.length;++s){var u=a[i[s]];if(Array.isArray(u)){var l=n<0?u.length+n:n-1;if(l>=0&&l<u.length&&u[l]===e)return!0}}return!1}function x(e,t,o,a){if(t){var s=[],u=c(t),l=function e(t,o){if(null==t||"object"!=n(t))return[];null==o&&(o=t);for(var a=t.subject?[o]:[],i=Object.keys(t),s=0;s<i.length;++s){var u=i[s],l=t[u];a.push.apply(a,r(e(l,"left"===u?l:o)))}return a}(t).map(c);i.traverse(e,{enter:function(e,t){if(null!=t&&s.unshift(t),u(e,s,a))if(l.length)for(var r=0,n=l.length;r<n;++r){l[r](e,s,a)&&o(e,t,s);for(var i=0,c=s.length;i<c;++i){var f=s.slice(i+1);l[r](s[i],f,a)&&o(s[i],t,f)}}else o(e,t,s)},leave:function(){s.shift()},keys:a&&a.visitorKeys,fallback:a&&a.fallback||"iteration"})}}function v(e,t,r){var n=[];return x(e,t,(function(e){n.push(e)}),r),n}function g(e){return s.parse(e)}function A(e,t,r){return v(e,g(t),r)}A.parse=g,A.match=v,A.traverse=x,A.matches=function(e,t,r,n){return!t||!!e&&(r||(r=[]),c(t)(e,r,n))},A.query=A;export default A;
+//# sourceMappingURL=esquery.esm.min.js.map
Index: frontend/node_modules/esquery/dist/esquery.esm.min.js.map
===================================================================
--- frontend/node_modules/esquery/dist/esquery.esm.min.js.map	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/dist/esquery.esm.min.js.map	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+{"version":3,"file":"esquery.esm.min.js","sources":["../node_modules/estraverse/estraverse.js","../parser.js","../esquery.js"],"sourcesContent":["/*\n  Copyright (C) 2012-2013 Yusuke Suzuki <utatane.tea@gmail.com>\n  Copyright (C) 2012 Ariya Hidayat <ariya.hidayat@gmail.com>\n\n  Redistribution and use in source and binary forms, with or without\n  modification, are permitted provided that the following conditions are met:\n\n    * Redistributions of source code must retain the above copyright\n      notice, this list of conditions and the following disclaimer.\n    * Redistributions in binary form must reproduce the above copyright\n      notice, this list of conditions and the following disclaimer in the\n      documentation and/or other materials provided with the distribution.\n\n  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\"\n  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\n  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\n  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY\n  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\n  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND\n  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF\n  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n*/\n/*jslint vars:false, bitwise:true*/\n/*jshint indent:4*/\n/*global exports:true*/\n(function clone(exports) {\n    'use strict';\n\n    var Syntax,\n        VisitorOption,\n        VisitorKeys,\n        BREAK,\n        SKIP,\n        REMOVE;\n\n    function deepCopy(obj) {\n        var ret = {}, key, val;\n        for (key in obj) {\n            if (obj.hasOwnProperty(key)) {\n                val = obj[key];\n                if (typeof val === 'object' && val !== null) {\n                    ret[key] = deepCopy(val);\n                } else {\n                    ret[key] = val;\n                }\n            }\n        }\n        return ret;\n    }\n\n    // based on LLVM libc++ upper_bound / lower_bound\n    // MIT License\n\n    function upperBound(array, func) {\n        var diff, len, i, current;\n\n        len = array.length;\n        i = 0;\n\n        while (len) {\n            diff = len >>> 1;\n            current = i + diff;\n            if (func(array[current])) {\n                len = diff;\n            } else {\n                i = current + 1;\n                len -= diff + 1;\n            }\n        }\n        return i;\n    }\n\n    Syntax = {\n        AssignmentExpression: 'AssignmentExpression',\n        AssignmentPattern: 'AssignmentPattern',\n        ArrayExpression: 'ArrayExpression',\n        ArrayPattern: 'ArrayPattern',\n        ArrowFunctionExpression: 'ArrowFunctionExpression',\n        AwaitExpression: 'AwaitExpression', // CAUTION: It's deferred to ES7.\n        BlockStatement: 'BlockStatement',\n        BinaryExpression: 'BinaryExpression',\n        BreakStatement: 'BreakStatement',\n        CallExpression: 'CallExpression',\n        CatchClause: 'CatchClause',\n        ChainExpression: 'ChainExpression',\n        ClassBody: 'ClassBody',\n        ClassDeclaration: 'ClassDeclaration',\n        ClassExpression: 'ClassExpression',\n        ComprehensionBlock: 'ComprehensionBlock',  // CAUTION: It's deferred to ES7.\n        ComprehensionExpression: 'ComprehensionExpression',  // CAUTION: It's deferred to ES7.\n        ConditionalExpression: 'ConditionalExpression',\n        ContinueStatement: 'ContinueStatement',\n        DebuggerStatement: 'DebuggerStatement',\n        DirectiveStatement: 'DirectiveStatement',\n        DoWhileStatement: 'DoWhileStatement',\n        EmptyStatement: 'EmptyStatement',\n        ExportAllDeclaration: 'ExportAllDeclaration',\n        ExportDefaultDeclaration: 'ExportDefaultDeclaration',\n        ExportNamedDeclaration: 'ExportNamedDeclaration',\n        ExportSpecifier: 'ExportSpecifier',\n        ExpressionStatement: 'ExpressionStatement',\n        ForStatement: 'ForStatement',\n        ForInStatement: 'ForInStatement',\n        ForOfStatement: 'ForOfStatement',\n        FunctionDeclaration: 'FunctionDeclaration',\n        FunctionExpression: 'FunctionExpression',\n        GeneratorExpression: 'GeneratorExpression',  // CAUTION: It's deferred to ES7.\n        Identifier: 'Identifier',\n        IfStatement: 'IfStatement',\n        ImportExpression: 'ImportExpression',\n        ImportDeclaration: 'ImportDeclaration',\n        ImportDefaultSpecifier: 'ImportDefaultSpecifier',\n        ImportNamespaceSpecifier: 'ImportNamespaceSpecifier',\n        ImportSpecifier: 'ImportSpecifier',\n        Literal: 'Literal',\n        LabeledStatement: 'LabeledStatement',\n        LogicalExpression: 'LogicalExpression',\n        MemberExpression: 'MemberExpression',\n        MetaProperty: 'MetaProperty',\n        MethodDefinition: 'MethodDefinition',\n        ModuleSpecifier: 'ModuleSpecifier',\n        NewExpression: 'NewExpression',\n        ObjectExpression: 'ObjectExpression',\n        ObjectPattern: 'ObjectPattern',\n        PrivateIdentifier: 'PrivateIdentifier',\n        Program: 'Program',\n        Property: 'Property',\n        PropertyDefinition: 'PropertyDefinition',\n        RestElement: 'RestElement',\n        ReturnStatement: 'ReturnStatement',\n        SequenceExpression: 'SequenceExpression',\n        SpreadElement: 'SpreadElement',\n        Super: 'Super',\n        SwitchStatement: 'SwitchStatement',\n        SwitchCase: 'SwitchCase',\n        TaggedTemplateExpression: 'TaggedTemplateExpression',\n        TemplateElement: 'TemplateElement',\n        TemplateLiteral: 'TemplateLiteral',\n        ThisExpression: 'ThisExpression',\n        ThrowStatement: 'ThrowStatement',\n        TryStatement: 'TryStatement',\n        UnaryExpression: 'UnaryExpression',\n        UpdateExpression: 'UpdateExpression',\n        VariableDeclaration: 'VariableDeclaration',\n        VariableDeclarator: 'VariableDeclarator',\n        WhileStatement: 'WhileStatement',\n        WithStatement: 'WithStatement',\n        YieldExpression: 'YieldExpression'\n    };\n\n    VisitorKeys = {\n        AssignmentExpression: ['left', 'right'],\n        AssignmentPattern: ['left', 'right'],\n        ArrayExpression: ['elements'],\n        ArrayPattern: ['elements'],\n        ArrowFunctionExpression: ['params', 'body'],\n        AwaitExpression: ['argument'], // CAUTION: It's deferred to ES7.\n        BlockStatement: ['body'],\n        BinaryExpression: ['left', 'right'],\n        BreakStatement: ['label'],\n        CallExpression: ['callee', 'arguments'],\n        CatchClause: ['param', 'body'],\n        ChainExpression: ['expression'],\n        ClassBody: ['body'],\n        ClassDeclaration: ['id', 'superClass', 'body'],\n        ClassExpression: ['id', 'superClass', 'body'],\n        ComprehensionBlock: ['left', 'right'],  // CAUTION: It's deferred to ES7.\n        ComprehensionExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.\n        ConditionalExpression: ['test', 'consequent', 'alternate'],\n        ContinueStatement: ['label'],\n        DebuggerStatement: [],\n        DirectiveStatement: [],\n        DoWhileStatement: ['body', 'test'],\n        EmptyStatement: [],\n        ExportAllDeclaration: ['source'],\n        ExportDefaultDeclaration: ['declaration'],\n        ExportNamedDeclaration: ['declaration', 'specifiers', 'source'],\n        ExportSpecifier: ['exported', 'local'],\n        ExpressionStatement: ['expression'],\n        ForStatement: ['init', 'test', 'update', 'body'],\n        ForInStatement: ['left', 'right', 'body'],\n        ForOfStatement: ['left', 'right', 'body'],\n        FunctionDeclaration: ['id', 'params', 'body'],\n        FunctionExpression: ['id', 'params', 'body'],\n        GeneratorExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.\n        Identifier: [],\n        IfStatement: ['test', 'consequent', 'alternate'],\n        ImportExpression: ['source'],\n        ImportDeclaration: ['specifiers', 'source'],\n        ImportDefaultSpecifier: ['local'],\n        ImportNamespaceSpecifier: ['local'],\n        ImportSpecifier: ['imported', 'local'],\n        Literal: [],\n        LabeledStatement: ['label', 'body'],\n        LogicalExpression: ['left', 'right'],\n        MemberExpression: ['object', 'property'],\n        MetaProperty: ['meta', 'property'],\n        MethodDefinition: ['key', 'value'],\n        ModuleSpecifier: [],\n        NewExpression: ['callee', 'arguments'],\n        ObjectExpression: ['properties'],\n        ObjectPattern: ['properties'],\n        PrivateIdentifier: [],\n        Program: ['body'],\n        Property: ['key', 'value'],\n        PropertyDefinition: ['key', 'value'],\n        RestElement: [ 'argument' ],\n        ReturnStatement: ['argument'],\n        SequenceExpression: ['expressions'],\n        SpreadElement: ['argument'],\n        Super: [],\n        SwitchStatement: ['discriminant', 'cases'],\n        SwitchCase: ['test', 'consequent'],\n        TaggedTemplateExpression: ['tag', 'quasi'],\n        TemplateElement: [],\n        TemplateLiteral: ['quasis', 'expressions'],\n        ThisExpression: [],\n        ThrowStatement: ['argument'],\n        TryStatement: ['block', 'handler', 'finalizer'],\n        UnaryExpression: ['argument'],\n        UpdateExpression: ['argument'],\n        VariableDeclaration: ['declarations'],\n        VariableDeclarator: ['id', 'init'],\n        WhileStatement: ['test', 'body'],\n        WithStatement: ['object', 'body'],\n        YieldExpression: ['argument']\n    };\n\n    // unique id\n    BREAK = {};\n    SKIP = {};\n    REMOVE = {};\n\n    VisitorOption = {\n        Break: BREAK,\n        Skip: SKIP,\n        Remove: REMOVE\n    };\n\n    function Reference(parent, key) {\n        this.parent = parent;\n        this.key = key;\n    }\n\n    Reference.prototype.replace = function replace(node) {\n        this.parent[this.key] = node;\n    };\n\n    Reference.prototype.remove = function remove() {\n        if (Array.isArray(this.parent)) {\n            this.parent.splice(this.key, 1);\n            return true;\n        } else {\n            this.replace(null);\n            return false;\n        }\n    };\n\n    function Element(node, path, wrap, ref) {\n        this.node = node;\n        this.path = path;\n        this.wrap = wrap;\n        this.ref = ref;\n    }\n\n    function Controller() { }\n\n    // API:\n    // return property path array from root to current node\n    Controller.prototype.path = function path() {\n        var i, iz, j, jz, result, element;\n\n        function addToPath(result, path) {\n            if (Array.isArray(path)) {\n                for (j = 0, jz = path.length; j < jz; ++j) {\n                    result.push(path[j]);\n                }\n            } else {\n                result.push(path);\n            }\n        }\n\n        // root node\n        if (!this.__current.path) {\n            return null;\n        }\n\n        // first node is sentinel, second node is root element\n        result = [];\n        for (i = 2, iz = this.__leavelist.length; i < iz; ++i) {\n            element = this.__leavelist[i];\n            addToPath(result, element.path);\n        }\n        addToPath(result, this.__current.path);\n        return result;\n    };\n\n    // API:\n    // return type of current node\n    Controller.prototype.type = function () {\n        var node = this.current();\n        return node.type || this.__current.wrap;\n    };\n\n    // API:\n    // return array of parent elements\n    Controller.prototype.parents = function parents() {\n        var i, iz, result;\n\n        // first node is sentinel\n        result = [];\n        for (i = 1, iz = this.__leavelist.length; i < iz; ++i) {\n            result.push(this.__leavelist[i].node);\n        }\n\n        return result;\n    };\n\n    // API:\n    // return current node\n    Controller.prototype.current = function current() {\n        return this.__current.node;\n    };\n\n    Controller.prototype.__execute = function __execute(callback, element) {\n        var previous, result;\n\n        result = undefined;\n\n        previous  = this.__current;\n        this.__current = element;\n        this.__state = null;\n        if (callback) {\n            result = callback.call(this, element.node, this.__leavelist[this.__leavelist.length - 1].node);\n        }\n        this.__current = previous;\n\n        return result;\n    };\n\n    // API:\n    // notify control skip / break\n    Controller.prototype.notify = function notify(flag) {\n        this.__state = flag;\n    };\n\n    // API:\n    // skip child nodes of current node\n    Controller.prototype.skip = function () {\n        this.notify(SKIP);\n    };\n\n    // API:\n    // break traversals\n    Controller.prototype['break'] = function () {\n        this.notify(BREAK);\n    };\n\n    // API:\n    // remove node\n    Controller.prototype.remove = function () {\n        this.notify(REMOVE);\n    };\n\n    Controller.prototype.__initialize = function(root, visitor) {\n        this.visitor = visitor;\n        this.root = root;\n        this.__worklist = [];\n        this.__leavelist = [];\n        this.__current = null;\n        this.__state = null;\n        this.__fallback = null;\n        if (visitor.fallback === 'iteration') {\n            this.__fallback = Object.keys;\n        } else if (typeof visitor.fallback === 'function') {\n            this.__fallback = visitor.fallback;\n        }\n\n        this.__keys = VisitorKeys;\n        if (visitor.keys) {\n            this.__keys = Object.assign(Object.create(this.__keys), visitor.keys);\n        }\n    };\n\n    function isNode(node) {\n        if (node == null) {\n            return false;\n        }\n        return typeof node === 'object' && typeof node.type === 'string';\n    }\n\n    function isProperty(nodeType, key) {\n        return (nodeType === Syntax.ObjectExpression || nodeType === Syntax.ObjectPattern) && 'properties' === key;\n    }\n  \n    function candidateExistsInLeaveList(leavelist, candidate) {\n        for (var i = leavelist.length - 1; i >= 0; --i) {\n            if (leavelist[i].node === candidate) {\n                return true;\n            }\n        }\n        return false;\n    }\n\n    Controller.prototype.traverse = function traverse(root, visitor) {\n        var worklist,\n            leavelist,\n            element,\n            node,\n            nodeType,\n            ret,\n            key,\n            current,\n            current2,\n            candidates,\n            candidate,\n            sentinel;\n\n        this.__initialize(root, visitor);\n\n        sentinel = {};\n\n        // reference\n        worklist = this.__worklist;\n        leavelist = this.__leavelist;\n\n        // initialize\n        worklist.push(new Element(root, null, null, null));\n        leavelist.push(new Element(null, null, null, null));\n\n        while (worklist.length) {\n            element = worklist.pop();\n\n            if (element === sentinel) {\n                element = leavelist.pop();\n\n                ret = this.__execute(visitor.leave, element);\n\n                if (this.__state === BREAK || ret === BREAK) {\n                    return;\n                }\n                continue;\n            }\n\n            if (element.node) {\n\n                ret = this.__execute(visitor.enter, element);\n\n                if (this.__state === BREAK || ret === BREAK) {\n                    return;\n                }\n\n                worklist.push(sentinel);\n                leavelist.push(element);\n\n                if (this.__state === SKIP || ret === SKIP) {\n                    continue;\n                }\n\n                node = element.node;\n                nodeType = node.type || element.wrap;\n                candidates = this.__keys[nodeType];\n                if (!candidates) {\n                    if (this.__fallback) {\n                        candidates = this.__fallback(node);\n                    } else {\n                        throw new Error('Unknown node type ' + nodeType + '.');\n                    }\n                }\n\n                current = candidates.length;\n                while ((current -= 1) >= 0) {\n                    key = candidates[current];\n                    candidate = node[key];\n                    if (!candidate) {\n                        continue;\n                    }\n\n                    if (Array.isArray(candidate)) {\n                        current2 = candidate.length;\n                        while ((current2 -= 1) >= 0) {\n                            if (!candidate[current2]) {\n                                continue;\n                            }\n\n                            if (candidateExistsInLeaveList(leavelist, candidate[current2])) {\n                              continue;\n                            }\n\n                            if (isProperty(nodeType, candidates[current])) {\n                                element = new Element(candidate[current2], [key, current2], 'Property', null);\n                            } else if (isNode(candidate[current2])) {\n                                element = new Element(candidate[current2], [key, current2], null, null);\n                            } else {\n                                continue;\n                            }\n                            worklist.push(element);\n                        }\n                    } else if (isNode(candidate)) {\n                        if (candidateExistsInLeaveList(leavelist, candidate)) {\n                          continue;\n                        }\n\n                        worklist.push(new Element(candidate, key, null, null));\n                    }\n                }\n            }\n        }\n    };\n\n    Controller.prototype.replace = function replace(root, visitor) {\n        var worklist,\n            leavelist,\n            node,\n            nodeType,\n            target,\n            element,\n            current,\n            current2,\n            candidates,\n            candidate,\n            sentinel,\n            outer,\n            key;\n\n        function removeElem(element) {\n            var i,\n                key,\n                nextElem,\n                parent;\n\n            if (element.ref.remove()) {\n                // When the reference is an element of an array.\n                key = element.ref.key;\n                parent = element.ref.parent;\n\n                // If removed from array, then decrease following items' keys.\n                i = worklist.length;\n                while (i--) {\n                    nextElem = worklist[i];\n                    if (nextElem.ref && nextElem.ref.parent === parent) {\n                        if  (nextElem.ref.key < key) {\n                            break;\n                        }\n                        --nextElem.ref.key;\n                    }\n                }\n            }\n        }\n\n        this.__initialize(root, visitor);\n\n        sentinel = {};\n\n        // reference\n        worklist = this.__worklist;\n        leavelist = this.__leavelist;\n\n        // initialize\n        outer = {\n            root: root\n        };\n        element = new Element(root, null, null, new Reference(outer, 'root'));\n        worklist.push(element);\n        leavelist.push(element);\n\n        while (worklist.length) {\n            element = worklist.pop();\n\n            if (element === sentinel) {\n                element = leavelist.pop();\n\n                target = this.__execute(visitor.leave, element);\n\n                // node may be replaced with null,\n                // so distinguish between undefined and null in this place\n                if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {\n                    // replace\n                    element.ref.replace(target);\n                }\n\n                if (this.__state === REMOVE || target === REMOVE) {\n                    removeElem(element);\n                }\n\n                if (this.__state === BREAK || target === BREAK) {\n                    return outer.root;\n                }\n                continue;\n            }\n\n            target = this.__execute(visitor.enter, element);\n\n            // node may be replaced with null,\n            // so distinguish between undefined and null in this place\n            if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {\n                // replace\n                element.ref.replace(target);\n                element.node = target;\n            }\n\n            if (this.__state === REMOVE || target === REMOVE) {\n                removeElem(element);\n                element.node = null;\n            }\n\n            if (this.__state === BREAK || target === BREAK) {\n                return outer.root;\n            }\n\n            // node may be null\n            node = element.node;\n            if (!node) {\n                continue;\n            }\n\n            worklist.push(sentinel);\n            leavelist.push(element);\n\n            if (this.__state === SKIP || target === SKIP) {\n                continue;\n            }\n\n            nodeType = node.type || element.wrap;\n            candidates = this.__keys[nodeType];\n            if (!candidates) {\n                if (this.__fallback) {\n                    candidates = this.__fallback(node);\n                } else {\n                    throw new Error('Unknown node type ' + nodeType + '.');\n                }\n            }\n\n            current = candidates.length;\n            while ((current -= 1) >= 0) {\n                key = candidates[current];\n                candidate = node[key];\n                if (!candidate) {\n                    continue;\n                }\n\n                if (Array.isArray(candidate)) {\n                    current2 = candidate.length;\n                    while ((current2 -= 1) >= 0) {\n                        if (!candidate[current2]) {\n                            continue;\n                        }\n                        if (isProperty(nodeType, candidates[current])) {\n                            element = new Element(candidate[current2], [key, current2], 'Property', new Reference(candidate, current2));\n                        } else if (isNode(candidate[current2])) {\n                            element = new Element(candidate[current2], [key, current2], null, new Reference(candidate, current2));\n                        } else {\n                            continue;\n                        }\n                        worklist.push(element);\n                    }\n                } else if (isNode(candidate)) {\n                    worklist.push(new Element(candidate, key, null, new Reference(node, key)));\n                }\n            }\n        }\n\n        return outer.root;\n    };\n\n    function traverse(root, visitor) {\n        var controller = new Controller();\n        return controller.traverse(root, visitor);\n    }\n\n    function replace(root, visitor) {\n        var controller = new Controller();\n        return controller.replace(root, visitor);\n    }\n\n    function extendCommentRange(comment, tokens) {\n        var target;\n\n        target = upperBound(tokens, function search(token) {\n            return token.range[0] > comment.range[0];\n        });\n\n        comment.extendedRange = [comment.range[0], comment.range[1]];\n\n        if (target !== tokens.length) {\n            comment.extendedRange[1] = tokens[target].range[0];\n        }\n\n        target -= 1;\n        if (target >= 0) {\n            comment.extendedRange[0] = tokens[target].range[1];\n        }\n\n        return comment;\n    }\n\n    function attachComments(tree, providedComments, tokens) {\n        // At first, we should calculate extended comment ranges.\n        var comments = [], comment, len, i, cursor;\n\n        if (!tree.range) {\n            throw new Error('attachComments needs range information');\n        }\n\n        // tokens array is empty, we attach comments to tree as 'leadingComments'\n        if (!tokens.length) {\n            if (providedComments.length) {\n                for (i = 0, len = providedComments.length; i < len; i += 1) {\n                    comment = deepCopy(providedComments[i]);\n                    comment.extendedRange = [0, tree.range[0]];\n                    comments.push(comment);\n                }\n                tree.leadingComments = comments;\n            }\n            return tree;\n        }\n\n        for (i = 0, len = providedComments.length; i < len; i += 1) {\n            comments.push(extendCommentRange(deepCopy(providedComments[i]), tokens));\n        }\n\n        // This is based on John Freeman's implementation.\n        cursor = 0;\n        traverse(tree, {\n            enter: function (node) {\n                var comment;\n\n                while (cursor < comments.length) {\n                    comment = comments[cursor];\n                    if (comment.extendedRange[1] > node.range[0]) {\n                        break;\n                    }\n\n                    if (comment.extendedRange[1] === node.range[0]) {\n                        if (!node.leadingComments) {\n                            node.leadingComments = [];\n                        }\n                        node.leadingComments.push(comment);\n                        comments.splice(cursor, 1);\n                    } else {\n                        cursor += 1;\n                    }\n                }\n\n                // already out of owned node\n                if (cursor === comments.length) {\n                    return VisitorOption.Break;\n                }\n\n                if (comments[cursor].extendedRange[0] > node.range[1]) {\n                    return VisitorOption.Skip;\n                }\n            }\n        });\n\n        cursor = 0;\n        traverse(tree, {\n            leave: function (node) {\n                var comment;\n\n                while (cursor < comments.length) {\n                    comment = comments[cursor];\n                    if (node.range[1] < comment.extendedRange[0]) {\n                        break;\n                    }\n\n                    if (node.range[1] === comment.extendedRange[0]) {\n                        if (!node.trailingComments) {\n                            node.trailingComments = [];\n                        }\n                        node.trailingComments.push(comment);\n                        comments.splice(cursor, 1);\n                    } else {\n                        cursor += 1;\n                    }\n                }\n\n                // already out of owned node\n                if (cursor === comments.length) {\n                    return VisitorOption.Break;\n                }\n\n                if (comments[cursor].extendedRange[0] > node.range[1]) {\n                    return VisitorOption.Skip;\n                }\n            }\n        });\n\n        return tree;\n    }\n\n    exports.Syntax = Syntax;\n    exports.traverse = traverse;\n    exports.replace = replace;\n    exports.attachComments = attachComments;\n    exports.VisitorKeys = VisitorKeys;\n    exports.VisitorOption = VisitorOption;\n    exports.Controller = Controller;\n    exports.cloneEnvironment = function () { return clone({}); };\n\n    return exports;\n}(exports));\n/* vim: set sw=4 ts=4 et tw=80 : */\n","/*\n * Generated by PEG.js 0.10.0.\n *\n * http://pegjs.org/\n */\n(function(root, factory) {\n  if (typeof define === \"function\" && define.amd) {\n    define([], factory);\n  } else if (typeof module === \"object\" && module.exports) {\n    module.exports = factory();\n  }\n})(this, function() {\n  \"use strict\";\n\n  function peg$subclass(child, parent) {\n    function ctor() { this.constructor = child; }\n    ctor.prototype = parent.prototype;\n    child.prototype = new ctor();\n  }\n\n  function peg$SyntaxError(message, expected, found, location) {\n    this.message  = message;\n    this.expected = expected;\n    this.found    = found;\n    this.location = location;\n    this.name     = \"SyntaxError\";\n\n    if (typeof Error.captureStackTrace === \"function\") {\n      Error.captureStackTrace(this, peg$SyntaxError);\n    }\n  }\n\n  peg$subclass(peg$SyntaxError, Error);\n\n  peg$SyntaxError.buildMessage = function(expected, found) {\n    var DESCRIBE_EXPECTATION_FNS = {\n          literal: function(expectation) {\n            return \"\\\"\" + literalEscape(expectation.text) + \"\\\"\";\n          },\n\n          \"class\": function(expectation) {\n            var escapedParts = \"\",\n                i;\n\n            for (i = 0; i < expectation.parts.length; i++) {\n              escapedParts += expectation.parts[i] instanceof Array\n                ? classEscape(expectation.parts[i][0]) + \"-\" + classEscape(expectation.parts[i][1])\n                : classEscape(expectation.parts[i]);\n            }\n\n            return \"[\" + (expectation.inverted ? \"^\" : \"\") + escapedParts + \"]\";\n          },\n\n          any: function(expectation) {\n            return \"any character\";\n          },\n\n          end: function(expectation) {\n            return \"end of input\";\n          },\n\n          other: function(expectation) {\n            return expectation.description;\n          }\n        };\n\n    function hex(ch) {\n      return ch.charCodeAt(0).toString(16).toUpperCase();\n    }\n\n    function literalEscape(s) {\n      return s\n        .replace(/\\\\/g, '\\\\\\\\')\n        .replace(/\"/g,  '\\\\\"')\n        .replace(/\\0/g, '\\\\0')\n        .replace(/\\t/g, '\\\\t')\n        .replace(/\\n/g, '\\\\n')\n        .replace(/\\r/g, '\\\\r')\n        .replace(/[\\x00-\\x0F]/g,          function(ch) { return '\\\\x0' + hex(ch); })\n        .replace(/[\\x10-\\x1F\\x7F-\\x9F]/g, function(ch) { return '\\\\x'  + hex(ch); });\n    }\n\n    function classEscape(s) {\n      return s\n        .replace(/\\\\/g, '\\\\\\\\')\n        .replace(/\\]/g, '\\\\]')\n        .replace(/\\^/g, '\\\\^')\n        .replace(/-/g,  '\\\\-')\n        .replace(/\\0/g, '\\\\0')\n        .replace(/\\t/g, '\\\\t')\n        .replace(/\\n/g, '\\\\n')\n        .replace(/\\r/g, '\\\\r')\n        .replace(/[\\x00-\\x0F]/g,          function(ch) { return '\\\\x0' + hex(ch); })\n        .replace(/[\\x10-\\x1F\\x7F-\\x9F]/g, function(ch) { return '\\\\x'  + hex(ch); });\n    }\n\n    function describeExpectation(expectation) {\n      return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);\n    }\n\n    function describeExpected(expected) {\n      var descriptions = new Array(expected.length),\n          i, j;\n\n      for (i = 0; i < expected.length; i++) {\n        descriptions[i] = describeExpectation(expected[i]);\n      }\n\n      descriptions.sort();\n\n      if (descriptions.length > 0) {\n        for (i = 1, j = 1; i < descriptions.length; i++) {\n          if (descriptions[i - 1] !== descriptions[i]) {\n            descriptions[j] = descriptions[i];\n            j++;\n          }\n        }\n        descriptions.length = j;\n      }\n\n      switch (descriptions.length) {\n        case 1:\n          return descriptions[0];\n\n        case 2:\n          return descriptions[0] + \" or \" + descriptions[1];\n\n        default:\n          return descriptions.slice(0, -1).join(\", \")\n            + \", or \"\n            + descriptions[descriptions.length - 1];\n      }\n    }\n\n    function describeFound(found) {\n      return found ? \"\\\"\" + literalEscape(found) + \"\\\"\" : \"end of input\";\n    }\n\n    return \"Expected \" + describeExpected(expected) + \" but \" + describeFound(found) + \" found.\";\n  };\n\n  function peg$parse(input, options) {\n    options = options !== void 0 ? options : {};\n\n    var peg$FAILED = {},\n\n        peg$startRuleFunctions = { start: peg$parsestart },\n        peg$startRuleFunction  = peg$parsestart,\n\n        peg$c0 = function(ss) {\n            return ss.length === 1 ? ss[0] : { type: 'matches', selectors: ss };\n          },\n        peg$c1 = function() { return void 0; },\n        peg$c2 = \" \",\n        peg$c3 = peg$literalExpectation(\" \", false),\n        peg$c4 = /^[^ [\\],():#!=><~+.]/,\n        peg$c5 = peg$classExpectation([\" \", \"[\", \"]\", \",\", \"(\", \")\", \":\", \"#\", \"!\", \"=\", \">\", \"<\", \"~\", \"+\", \".\"], true, false),\n        peg$c6 = function(i) { return i.join(''); },\n        peg$c7 = \">\",\n        peg$c8 = peg$literalExpectation(\">\", false),\n        peg$c9 = function() { return 'child'; },\n        peg$c10 = \"~\",\n        peg$c11 = peg$literalExpectation(\"~\", false),\n        peg$c12 = function() { return 'sibling'; },\n        peg$c13 = \"+\",\n        peg$c14 = peg$literalExpectation(\"+\", false),\n        peg$c15 = function() { return 'adjacent'; },\n        peg$c16 = function() { return 'descendant'; },\n        peg$c17 = \",\",\n        peg$c18 = peg$literalExpectation(\",\", false),\n        peg$c19 = function(s, ss) {\n          return [s].concat(ss.map(function (s) { return s[3]; }));\n        },\n        peg$c20 = function(op, s) {\n            if (!op) return s;\n            return { type: op, left: { type: 'exactNode' }, right: s };\n          },\n        peg$c21 = function(a, ops) {\n            return ops.reduce(function (memo, rhs) {\n              return { type: rhs[0], left: memo, right: rhs[1] };\n            }, a);\n          },\n        peg$c22 = \"!\",\n        peg$c23 = peg$literalExpectation(\"!\", false),\n        peg$c24 = function(subject, as) {\n            const b = as.length === 1 ? as[0] : { type: 'compound', selectors: as };\n            if(subject) b.subject = true;\n            return b;\n          },\n        peg$c25 = \"*\",\n        peg$c26 = peg$literalExpectation(\"*\", false),\n        peg$c27 = function(a) { return { type: 'wildcard', value: a }; },\n        peg$c28 = \"#\",\n        peg$c29 = peg$literalExpectation(\"#\", false),\n        peg$c30 = function(i) { return { type: 'identifier', value: i }; },\n        peg$c31 = \"[\",\n        peg$c32 = peg$literalExpectation(\"[\", false),\n        peg$c33 = \"]\",\n        peg$c34 = peg$literalExpectation(\"]\", false),\n        peg$c35 = function(v) { return v; },\n        peg$c36 = /^[><!]/,\n        peg$c37 = peg$classExpectation([\">\", \"<\", \"!\"], false, false),\n        peg$c38 = \"=\",\n        peg$c39 = peg$literalExpectation(\"=\", false),\n        peg$c40 = function(a) { return (a || '') + '='; },\n        peg$c41 = /^[><]/,\n        peg$c42 = peg$classExpectation([\">\", \"<\"], false, false),\n        peg$c43 = \".\",\n        peg$c44 = peg$literalExpectation(\".\", false),\n        peg$c45 = function(a, as) {\n            return [].concat.apply([a], as).join('');\n          },\n        peg$c46 = function(name, op, value) {\n              return { type: 'attribute', name: name, operator: op, value: value };\n            },\n        peg$c47 = function(name) { return { type: 'attribute', name: name }; },\n        peg$c48 = \"\\\"\",\n        peg$c49 = peg$literalExpectation(\"\\\"\", false),\n        peg$c50 = /^[^\\\\\"]/,\n        peg$c51 = peg$classExpectation([\"\\\\\", \"\\\"\"], true, false),\n        peg$c52 = \"\\\\\",\n        peg$c53 = peg$literalExpectation(\"\\\\\", false),\n        peg$c54 = peg$anyExpectation(),\n        peg$c55 = function(a, b) { return a + b; },\n        peg$c56 = function(d) {\n                return { type: 'literal', value: strUnescape(d.join('')) };\n              },\n        peg$c57 = \"'\",\n        peg$c58 = peg$literalExpectation(\"'\", false),\n        peg$c59 = /^[^\\\\']/,\n        peg$c60 = peg$classExpectation([\"\\\\\", \"'\"], true, false),\n        peg$c61 = /^[0-9]/,\n        peg$c62 = peg$classExpectation([[\"0\", \"9\"]], false, false),\n        peg$c63 = function(a, b) {\n                // Can use `a.flat().join('')` once supported\n                const leadingDecimals = a ? [].concat.apply([], a).join('') : '';\n                return { type: 'literal', value: parseFloat(leadingDecimals + b.join('')) };\n              },\n        peg$c64 = function(i) { return { type: 'literal', value: i }; },\n        peg$c65 = \"type(\",\n        peg$c66 = peg$literalExpectation(\"type(\", false),\n        peg$c67 = /^[^ )]/,\n        peg$c68 = peg$classExpectation([\" \", \")\"], true, false),\n        peg$c69 = \")\",\n        peg$c70 = peg$literalExpectation(\")\", false),\n        peg$c71 = function(t) { return { type: 'type', value: t.join('') }; },\n        peg$c72 = /^[imsu]/,\n        peg$c73 = peg$classExpectation([\"i\", \"m\", \"s\", \"u\"], false, false),\n        peg$c74 = \"/\",\n        peg$c75 = peg$literalExpectation(\"/\", false),\n        peg$c76 = function(pattern, flgs) {\n              return {\n                type: 'regexp', value: new RegExp(pattern.join(''), flgs ? flgs.join('') : '')\n              };\n            },\n        peg$c77 = /^[^\\]\\\\]/,\n        peg$c78 = peg$classExpectation([\"]\", \"\\\\\"], true, false),\n        peg$c79 = function(cs) { return '[' + cs.join('') + ']'; },\n        peg$c80 = function(a) { return '\\\\' + a; },\n        peg$c81 = /^[^\\/\\\\[]/,\n        peg$c82 = peg$classExpectation([\"/\", \"\\\\\", \"[\"], true, false),\n        peg$c83 = function(cs) { return cs.join(''); },\n        peg$c84 = function(i, is) {\n          return { type: 'field', name: is.reduce(function(memo, p){ return memo + p[0] + p[1]; }, i)};\n        },\n        peg$c85 = \":not(\",\n        peg$c86 = peg$literalExpectation(\":not(\", false),\n        peg$c87 = function(ss) { return { type: 'not', selectors: ss }; },\n        peg$c88 = \":matches(\",\n        peg$c89 = peg$literalExpectation(\":matches(\", false),\n        peg$c90 = function(ss) { return { type: 'matches', selectors: ss }; },\n        peg$c91 = \":is(\",\n        peg$c92 = peg$literalExpectation(\":is(\", false),\n        peg$c93 = \":has(\",\n        peg$c94 = peg$literalExpectation(\":has(\", false),\n        peg$c95 = function(ss) { return { type: 'has', selectors: ss }; },\n        peg$c96 = \":first-child\",\n        peg$c97 = peg$literalExpectation(\":first-child\", false),\n        peg$c98 = function() { return nth(1); },\n        peg$c99 = \":last-child\",\n        peg$c100 = peg$literalExpectation(\":last-child\", false),\n        peg$c101 = function() { return nthLast(1); },\n        peg$c102 = \":nth-child(\",\n        peg$c103 = peg$literalExpectation(\":nth-child(\", false),\n        peg$c104 = function(n) { return nth(parseInt(n.join(''), 10)); },\n        peg$c105 = \":nth-last-child(\",\n        peg$c106 = peg$literalExpectation(\":nth-last-child(\", false),\n        peg$c107 = function(n) { return nthLast(parseInt(n.join(''), 10)); },\n        peg$c108 = \":\",\n        peg$c109 = peg$literalExpectation(\":\", false),\n        peg$c110 = function(c) {\n          return { type: 'class', name: c };\n        },\n\n        peg$currPos          = 0,\n        peg$savedPos         = 0,\n        peg$posDetailsCache  = [{ line: 1, column: 1 }],\n        peg$maxFailPos       = 0,\n        peg$maxFailExpected  = [],\n        peg$silentFails      = 0,\n\n        peg$resultsCache = {},\n\n        peg$result;\n\n    if (\"startRule\" in options) {\n      if (!(options.startRule in peg$startRuleFunctions)) {\n        throw new Error(\"Can't start parsing from rule \\\"\" + options.startRule + \"\\\".\");\n      }\n\n      peg$startRuleFunction = peg$startRuleFunctions[options.startRule];\n    }\n\n    function text() {\n      return input.substring(peg$savedPos, peg$currPos);\n    }\n\n    function location() {\n      return peg$computeLocation(peg$savedPos, peg$currPos);\n    }\n\n    function expected(description, location) {\n      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)\n\n      throw peg$buildStructuredError(\n        [peg$otherExpectation(description)],\n        input.substring(peg$savedPos, peg$currPos),\n        location\n      );\n    }\n\n    function error(message, location) {\n      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)\n\n      throw peg$buildSimpleError(message, location);\n    }\n\n    function peg$literalExpectation(text, ignoreCase) {\n      return { type: \"literal\", text: text, ignoreCase: ignoreCase };\n    }\n\n    function peg$classExpectation(parts, inverted, ignoreCase) {\n      return { type: \"class\", parts: parts, inverted: inverted, ignoreCase: ignoreCase };\n    }\n\n    function peg$anyExpectation() {\n      return { type: \"any\" };\n    }\n\n    function peg$endExpectation() {\n      return { type: \"end\" };\n    }\n\n    function peg$otherExpectation(description) {\n      return { type: \"other\", description: description };\n    }\n\n    function peg$computePosDetails(pos) {\n      var details = peg$posDetailsCache[pos], p;\n\n      if (details) {\n        return details;\n      } else {\n        p = pos - 1;\n        while (!peg$posDetailsCache[p]) {\n          p--;\n        }\n\n        details = peg$posDetailsCache[p];\n        details = {\n          line:   details.line,\n          column: details.column\n        };\n\n        while (p < pos) {\n          if (input.charCodeAt(p) === 10) {\n            details.line++;\n            details.column = 1;\n          } else {\n            details.column++;\n          }\n\n          p++;\n        }\n\n        peg$posDetailsCache[pos] = details;\n        return details;\n      }\n    }\n\n    function peg$computeLocation(startPos, endPos) {\n      var startPosDetails = peg$computePosDetails(startPos),\n          endPosDetails   = peg$computePosDetails(endPos);\n\n      return {\n        start: {\n          offset: startPos,\n          line:   startPosDetails.line,\n          column: startPosDetails.column\n        },\n        end: {\n          offset: endPos,\n          line:   endPosDetails.line,\n          column: endPosDetails.column\n        }\n      };\n    }\n\n    function peg$fail(expected) {\n      if (peg$currPos < peg$maxFailPos) { return; }\n\n      if (peg$currPos > peg$maxFailPos) {\n        peg$maxFailPos = peg$currPos;\n        peg$maxFailExpected = [];\n      }\n\n      peg$maxFailExpected.push(expected);\n    }\n\n    function peg$buildSimpleError(message, location) {\n      return new peg$SyntaxError(message, null, null, location);\n    }\n\n    function peg$buildStructuredError(expected, found, location) {\n      return new peg$SyntaxError(\n        peg$SyntaxError.buildMessage(expected, found),\n        expected,\n        found,\n        location\n      );\n    }\n\n    function peg$parsestart() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 0,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parse_();\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseselectors();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parse_();\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c0(s2);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        s1 = peg$parse_();\n        if (s1 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c1();\n        }\n        s0 = s1;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parse_() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 1,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = [];\n      if (input.charCodeAt(peg$currPos) === 32) {\n        s1 = peg$c2;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c3); }\n      }\n      while (s1 !== peg$FAILED) {\n        s0.push(s1);\n        if (input.charCodeAt(peg$currPos) === 32) {\n          s1 = peg$c2;\n          peg$currPos++;\n        } else {\n          s1 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c3); }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseidentifierName() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 2,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = [];\n      if (peg$c4.test(input.charAt(peg$currPos))) {\n        s2 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s2 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c5); }\n      }\n      if (s2 !== peg$FAILED) {\n        while (s2 !== peg$FAILED) {\n          s1.push(s2);\n          if (peg$c4.test(input.charAt(peg$currPos))) {\n            s2 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s2 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c5); }\n          }\n        }\n      } else {\n        s1 = peg$FAILED;\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c6(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsebinaryOp() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 3,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parse_();\n      if (s1 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 62) {\n          s2 = peg$c7;\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c8); }\n        }\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parse_();\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c9();\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        s1 = peg$parse_();\n        if (s1 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 126) {\n            s2 = peg$c10;\n            peg$currPos++;\n          } else {\n            s2 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c11); }\n          }\n          if (s2 !== peg$FAILED) {\n            s3 = peg$parse_();\n            if (s3 !== peg$FAILED) {\n              peg$savedPos = s0;\n              s1 = peg$c12();\n              s0 = s1;\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n        if (s0 === peg$FAILED) {\n          s0 = peg$currPos;\n          s1 = peg$parse_();\n          if (s1 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 43) {\n              s2 = peg$c13;\n              peg$currPos++;\n            } else {\n              s2 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c14); }\n            }\n            if (s2 !== peg$FAILED) {\n              s3 = peg$parse_();\n              if (s3 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c15();\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n          if (s0 === peg$FAILED) {\n            s0 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 32) {\n              s1 = peg$c2;\n              peg$currPos++;\n            } else {\n              s1 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c3); }\n            }\n            if (s1 !== peg$FAILED) {\n              s2 = peg$parse_();\n              if (s2 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c16();\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsehasSelectors() {\n      var s0, s1, s2, s3, s4, s5, s6, s7;\n\n      var key    = peg$currPos * 36 + 4,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parsehasSelector();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        s4 = peg$parse_();\n        if (s4 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 44) {\n            s5 = peg$c17;\n            peg$currPos++;\n          } else {\n            s5 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c18); }\n          }\n          if (s5 !== peg$FAILED) {\n            s6 = peg$parse_();\n            if (s6 !== peg$FAILED) {\n              s7 = peg$parsehasSelector();\n              if (s7 !== peg$FAILED) {\n                s4 = [s4, s5, s6, s7];\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          s4 = peg$parse_();\n          if (s4 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 44) {\n              s5 = peg$c17;\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c18); }\n            }\n            if (s5 !== peg$FAILED) {\n              s6 = peg$parse_();\n              if (s6 !== peg$FAILED) {\n                s7 = peg$parsehasSelector();\n                if (s7 !== peg$FAILED) {\n                  s4 = [s4, s5, s6, s7];\n                  s3 = s4;\n                } else {\n                  peg$currPos = s3;\n                  s3 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c19(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseselectors() {\n      var s0, s1, s2, s3, s4, s5, s6, s7;\n\n      var key    = peg$currPos * 36 + 5,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseselector();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        s4 = peg$parse_();\n        if (s4 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 44) {\n            s5 = peg$c17;\n            peg$currPos++;\n          } else {\n            s5 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c18); }\n          }\n          if (s5 !== peg$FAILED) {\n            s6 = peg$parse_();\n            if (s6 !== peg$FAILED) {\n              s7 = peg$parseselector();\n              if (s7 !== peg$FAILED) {\n                s4 = [s4, s5, s6, s7];\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          s4 = peg$parse_();\n          if (s4 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 44) {\n              s5 = peg$c17;\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c18); }\n            }\n            if (s5 !== peg$FAILED) {\n              s6 = peg$parse_();\n              if (s6 !== peg$FAILED) {\n                s7 = peg$parseselector();\n                if (s7 !== peg$FAILED) {\n                  s4 = [s4, s5, s6, s7];\n                  s3 = s4;\n                } else {\n                  peg$currPos = s3;\n                  s3 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c19(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsehasSelector() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 6,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parsebinaryOp();\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseselector();\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c20(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseselector() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 7,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parsesequence();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        s4 = peg$parsebinaryOp();\n        if (s4 !== peg$FAILED) {\n          s5 = peg$parsesequence();\n          if (s5 !== peg$FAILED) {\n            s4 = [s4, s5];\n            s3 = s4;\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          s4 = peg$parsebinaryOp();\n          if (s4 !== peg$FAILED) {\n            s5 = peg$parsesequence();\n            if (s5 !== peg$FAILED) {\n              s4 = [s4, s5];\n              s3 = s4;\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c21(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsesequence() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 8,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 33) {\n        s1 = peg$c22;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c23); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$parseatom();\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            s3 = peg$parseatom();\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c24(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseatom() {\n      var s0;\n\n      var key    = peg$currPos * 36 + 9,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$parsewildcard();\n      if (s0 === peg$FAILED) {\n        s0 = peg$parseidentifier();\n        if (s0 === peg$FAILED) {\n          s0 = peg$parseattr();\n          if (s0 === peg$FAILED) {\n            s0 = peg$parsefield();\n            if (s0 === peg$FAILED) {\n              s0 = peg$parsenegation();\n              if (s0 === peg$FAILED) {\n                s0 = peg$parsematches();\n                if (s0 === peg$FAILED) {\n                  s0 = peg$parseis();\n                  if (s0 === peg$FAILED) {\n                    s0 = peg$parsehas();\n                    if (s0 === peg$FAILED) {\n                      s0 = peg$parsefirstChild();\n                      if (s0 === peg$FAILED) {\n                        s0 = peg$parselastChild();\n                        if (s0 === peg$FAILED) {\n                          s0 = peg$parsenthChild();\n                          if (s0 === peg$FAILED) {\n                            s0 = peg$parsenthLastChild();\n                            if (s0 === peg$FAILED) {\n                              s0 = peg$parseclass();\n                            }\n                          }\n                        }\n                      }\n                    }\n                  }\n                }\n              }\n            }\n          }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsewildcard() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 10,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 42) {\n        s1 = peg$c25;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c26); }\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c27(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseidentifier() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 11,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 35) {\n        s1 = peg$c28;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c29); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseidentifierName();\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c30(s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattr() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 12,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 91) {\n        s1 = peg$c31;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c32); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseattrValue();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 93) {\n                s5 = peg$c33;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c34); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c35(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrOps() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 13,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (peg$c36.test(input.charAt(peg$currPos))) {\n        s1 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c37); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 61) {\n          s2 = peg$c38;\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c39); }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c40(s1);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        if (peg$c41.test(input.charAt(peg$currPos))) {\n          s0 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s0 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c42); }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrEqOps() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 14,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 33) {\n        s1 = peg$c22;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c23); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 61) {\n          s2 = peg$c38;\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c39); }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c40(s1);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrName() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 15,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseidentifierName();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        if (input.charCodeAt(peg$currPos) === 46) {\n          s4 = peg$c43;\n          peg$currPos++;\n        } else {\n          s4 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c44); }\n        }\n        if (s4 !== peg$FAILED) {\n          s5 = peg$parseidentifierName();\n          if (s5 !== peg$FAILED) {\n            s4 = [s4, s5];\n            s3 = s4;\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          if (input.charCodeAt(peg$currPos) === 46) {\n            s4 = peg$c43;\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c44); }\n          }\n          if (s4 !== peg$FAILED) {\n            s5 = peg$parseidentifierName();\n            if (s5 !== peg$FAILED) {\n              s4 = [s4, s5];\n              s3 = s4;\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c45(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrValue() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 16,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseattrName();\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseattrEqOps();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              s5 = peg$parsetype();\n              if (s5 === peg$FAILED) {\n                s5 = peg$parseregex();\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c46(s1, s3, s5);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        s1 = peg$parseattrName();\n        if (s1 !== peg$FAILED) {\n          s2 = peg$parse_();\n          if (s2 !== peg$FAILED) {\n            s3 = peg$parseattrOps();\n            if (s3 !== peg$FAILED) {\n              s4 = peg$parse_();\n              if (s4 !== peg$FAILED) {\n                s5 = peg$parsestring();\n                if (s5 === peg$FAILED) {\n                  s5 = peg$parsenumber();\n                  if (s5 === peg$FAILED) {\n                    s5 = peg$parsepath();\n                  }\n                }\n                if (s5 !== peg$FAILED) {\n                  peg$savedPos = s0;\n                  s1 = peg$c46(s1, s3, s5);\n                  s0 = s1;\n                } else {\n                  peg$currPos = s0;\n                  s0 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n        if (s0 === peg$FAILED) {\n          s0 = peg$currPos;\n          s1 = peg$parseattrName();\n          if (s1 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c47(s1);\n          }\n          s0 = s1;\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsestring() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 17,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 34) {\n        s1 = peg$c48;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c49); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        if (peg$c50.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c51); }\n        }\n        if (s3 === peg$FAILED) {\n          s3 = peg$currPos;\n          if (input.charCodeAt(peg$currPos) === 92) {\n            s4 = peg$c52;\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c53); }\n          }\n          if (s4 !== peg$FAILED) {\n            if (input.length > peg$currPos) {\n              s5 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c54); }\n            }\n            if (s5 !== peg$FAILED) {\n              peg$savedPos = s3;\n              s4 = peg$c55(s4, s5);\n              s3 = s4;\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          if (peg$c50.test(input.charAt(peg$currPos))) {\n            s3 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c51); }\n          }\n          if (s3 === peg$FAILED) {\n            s3 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 92) {\n              s4 = peg$c52;\n              peg$currPos++;\n            } else {\n              s4 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c53); }\n            }\n            if (s4 !== peg$FAILED) {\n              if (input.length > peg$currPos) {\n                s5 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c54); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s3;\n                s4 = peg$c55(s4, s5);\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 34) {\n            s3 = peg$c48;\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c49); }\n          }\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c56(s2);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        if (input.charCodeAt(peg$currPos) === 39) {\n          s1 = peg$c57;\n          peg$currPos++;\n        } else {\n          s1 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c58); }\n        }\n        if (s1 !== peg$FAILED) {\n          s2 = [];\n          if (peg$c59.test(input.charAt(peg$currPos))) {\n            s3 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c60); }\n          }\n          if (s3 === peg$FAILED) {\n            s3 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 92) {\n              s4 = peg$c52;\n              peg$currPos++;\n            } else {\n              s4 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c53); }\n            }\n            if (s4 !== peg$FAILED) {\n              if (input.length > peg$currPos) {\n                s5 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c54); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s3;\n                s4 = peg$c55(s4, s5);\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          }\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            if (peg$c59.test(input.charAt(peg$currPos))) {\n              s3 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c60); }\n            }\n            if (s3 === peg$FAILED) {\n              s3 = peg$currPos;\n              if (input.charCodeAt(peg$currPos) === 92) {\n                s4 = peg$c52;\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c53); }\n              }\n              if (s4 !== peg$FAILED) {\n                if (input.length > peg$currPos) {\n                  s5 = input.charAt(peg$currPos);\n                  peg$currPos++;\n                } else {\n                  s5 = peg$FAILED;\n                  if (peg$silentFails === 0) { peg$fail(peg$c54); }\n                }\n                if (s5 !== peg$FAILED) {\n                  peg$savedPos = s3;\n                  s4 = peg$c55(s4, s5);\n                  s3 = s4;\n                } else {\n                  peg$currPos = s3;\n                  s3 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            }\n          }\n          if (s2 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 39) {\n              s3 = peg$c57;\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c58); }\n            }\n            if (s3 !== peg$FAILED) {\n              peg$savedPos = s0;\n              s1 = peg$c56(s2);\n              s0 = s1;\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenumber() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 18,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$currPos;\n      s2 = [];\n      if (peg$c61.test(input.charAt(peg$currPos))) {\n        s3 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s3 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c62); }\n      }\n      while (s3 !== peg$FAILED) {\n        s2.push(s3);\n        if (peg$c61.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c62); }\n        }\n      }\n      if (s2 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 46) {\n          s3 = peg$c43;\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c44); }\n        }\n        if (s3 !== peg$FAILED) {\n          s2 = [s2, s3];\n          s1 = s2;\n        } else {\n          peg$currPos = s1;\n          s1 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s1;\n        s1 = peg$FAILED;\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        if (peg$c61.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c62); }\n        }\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            if (peg$c61.test(input.charAt(peg$currPos))) {\n              s3 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c62); }\n            }\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c63(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsepath() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 19,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseidentifierName();\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c64(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsetype() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 20,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 5) === peg$c65) {\n        s1 = peg$c65;\n        peg$currPos += 5;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c66); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          if (peg$c67.test(input.charAt(peg$currPos))) {\n            s4 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c68); }\n          }\n          if (s4 !== peg$FAILED) {\n            while (s4 !== peg$FAILED) {\n              s3.push(s4);\n              if (peg$c67.test(input.charAt(peg$currPos))) {\n                s4 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c68); }\n              }\n            }\n          } else {\n            s3 = peg$FAILED;\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c71(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseflags() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 21,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = [];\n      if (peg$c72.test(input.charAt(peg$currPos))) {\n        s1 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c73); }\n      }\n      if (s1 !== peg$FAILED) {\n        while (s1 !== peg$FAILED) {\n          s0.push(s1);\n          if (peg$c72.test(input.charAt(peg$currPos))) {\n            s1 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s1 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c73); }\n          }\n        }\n      } else {\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseregex() {\n      var s0, s1, s2, s3, s4;\n\n      var key    = peg$currPos * 36 + 22,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 47) {\n        s1 = peg$c74;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c75); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$parsere_character_class();\n        if (s3 === peg$FAILED) {\n          s3 = peg$parsere_escape();\n          if (s3 === peg$FAILED) {\n            s3 = peg$parsere_chars();\n          }\n        }\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            s3 = peg$parsere_character_class();\n            if (s3 === peg$FAILED) {\n              s3 = peg$parsere_escape();\n              if (s3 === peg$FAILED) {\n                s3 = peg$parsere_chars();\n              }\n            }\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 47) {\n            s3 = peg$c74;\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c75); }\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parseflags();\n            if (s4 === peg$FAILED) {\n              s4 = null;\n            }\n            if (s4 !== peg$FAILED) {\n              peg$savedPos = s0;\n              s1 = peg$c76(s2, s4);\n              s0 = s1;\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsere_character_class() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 23,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 91) {\n        s1 = peg$c31;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c32); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        if (peg$c77.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c78); }\n        }\n        if (s3 === peg$FAILED) {\n          s3 = peg$parsere_escape();\n        }\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            if (peg$c77.test(input.charAt(peg$currPos))) {\n              s3 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c78); }\n            }\n            if (s3 === peg$FAILED) {\n              s3 = peg$parsere_escape();\n            }\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 93) {\n            s3 = peg$c33;\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c34); }\n          }\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c79(s2);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsere_escape() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 24,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 92) {\n        s1 = peg$c52;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c53); }\n      }\n      if (s1 !== peg$FAILED) {\n        if (input.length > peg$currPos) {\n          s2 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c54); }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c80(s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsere_chars() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 25,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = [];\n      if (peg$c81.test(input.charAt(peg$currPos))) {\n        s2 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s2 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c82); }\n      }\n      if (s2 !== peg$FAILED) {\n        while (s2 !== peg$FAILED) {\n          s1.push(s2);\n          if (peg$c81.test(input.charAt(peg$currPos))) {\n            s2 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s2 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c82); }\n          }\n        }\n      } else {\n        s1 = peg$FAILED;\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c83(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsefield() {\n      var s0, s1, s2, s3, s4, s5, s6;\n\n      var key    = peg$currPos * 36 + 26,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 46) {\n        s1 = peg$c43;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c44); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseidentifierName();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          s4 = peg$currPos;\n          if (input.charCodeAt(peg$currPos) === 46) {\n            s5 = peg$c43;\n            peg$currPos++;\n          } else {\n            s5 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c44); }\n          }\n          if (s5 !== peg$FAILED) {\n            s6 = peg$parseidentifierName();\n            if (s6 !== peg$FAILED) {\n              s5 = [s5, s6];\n              s4 = s5;\n            } else {\n              peg$currPos = s4;\n              s4 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s4;\n            s4 = peg$FAILED;\n          }\n          while (s4 !== peg$FAILED) {\n            s3.push(s4);\n            s4 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 46) {\n              s5 = peg$c43;\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c44); }\n            }\n            if (s5 !== peg$FAILED) {\n              s6 = peg$parseidentifierName();\n              if (s6 !== peg$FAILED) {\n                s5 = [s5, s6];\n                s4 = s5;\n              } else {\n                peg$currPos = s4;\n                s4 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s4;\n              s4 = peg$FAILED;\n            }\n          }\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c84(s2, s3);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenegation() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 27,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 5) === peg$c85) {\n        s1 = peg$c85;\n        peg$currPos += 5;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c86); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseselectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c87(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsematches() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 28,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 9) === peg$c88) {\n        s1 = peg$c88;\n        peg$currPos += 9;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c89); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseselectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c90(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseis() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 29,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 4) === peg$c91) {\n        s1 = peg$c91;\n        peg$currPos += 4;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c92); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseselectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c90(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsehas() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 30,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 5) === peg$c93) {\n        s1 = peg$c93;\n        peg$currPos += 5;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c94); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parsehasSelectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c95(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsefirstChild() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 31,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 12) === peg$c96) {\n        s1 = peg$c96;\n        peg$currPos += 12;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c97); }\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c98();\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parselastChild() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 32,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 11) === peg$c99) {\n        s1 = peg$c99;\n        peg$currPos += 11;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c100); }\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c101();\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenthChild() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 33,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 11) === peg$c102) {\n        s1 = peg$c102;\n        peg$currPos += 11;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c103); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          if (peg$c61.test(input.charAt(peg$currPos))) {\n            s4 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c62); }\n          }\n          if (s4 !== peg$FAILED) {\n            while (s4 !== peg$FAILED) {\n              s3.push(s4);\n              if (peg$c61.test(input.charAt(peg$currPos))) {\n                s4 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c62); }\n              }\n            }\n          } else {\n            s3 = peg$FAILED;\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c104(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenthLastChild() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 34,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 16) === peg$c105) {\n        s1 = peg$c105;\n        peg$currPos += 16;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c106); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          if (peg$c61.test(input.charAt(peg$currPos))) {\n            s4 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c62); }\n          }\n          if (s4 !== peg$FAILED) {\n            while (s4 !== peg$FAILED) {\n              s3.push(s4);\n              if (peg$c61.test(input.charAt(peg$currPos))) {\n                s4 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c62); }\n              }\n            }\n          } else {\n            s3 = peg$FAILED;\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c107(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseclass() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 35,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 58) {\n        s1 = peg$c108;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c109); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseidentifierName();\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c110(s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n\n      function nth(n) { return { type: 'nth-child', index: { type: 'literal', value: n } }; }\n      function nthLast(n) { return { type: 'nth-last-child', index: { type: 'literal', value: n } }; }\n      function strUnescape(s) {\n        return s.replace(/\\\\(.)/g, function(match, ch) {\n          switch(ch) {\n            case 'b': return '\\b';\n            case 'f': return '\\f';\n            case 'n': return '\\n';\n            case 'r': return '\\r';\n            case 't': return '\\t';\n            case 'v': return '\\v';\n            default: return ch;\n          }\n        });\n      }\n\n\n    peg$result = peg$startRuleFunction();\n\n    if (peg$result !== peg$FAILED && peg$currPos === input.length) {\n      return peg$result;\n    } else {\n      if (peg$result !== peg$FAILED && peg$currPos < input.length) {\n        peg$fail(peg$endExpectation());\n      }\n\n      throw peg$buildStructuredError(\n        peg$maxFailExpected,\n        peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,\n        peg$maxFailPos < input.length\n          ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)\n          : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)\n      );\n    }\n  }\n\n  return {\n    SyntaxError: peg$SyntaxError,\n    parse:       peg$parse\n  };\n});\n","/* vim: set sw=4 sts=4 : */\nimport estraverse from 'estraverse';\nimport parser from './parser.js';\n\n/**\n* @typedef {\"LEFT_SIDE\"|\"RIGHT_SIDE\"} Side\n*/\n\nconst LEFT_SIDE = 'LEFT_SIDE';\nconst RIGHT_SIDE = 'RIGHT_SIDE';\n\n/**\n * @external AST\n * @see https://esprima.readthedocs.io/en/latest/syntax-tree-format.html\n */\n\n/**\n * One of the rules of `grammar.pegjs`\n * @typedef {PlainObject} SelectorAST\n * @see grammar.pegjs\n*/\n\n/**\n * The `sequence` production of `grammar.pegjs`\n * @typedef {PlainObject} SelectorSequenceAST\n*/\n\n/**\n * Get the value of a property which may be multiple levels down\n * in the object.\n * @param {?PlainObject} obj\n * @param {string[]} keys\n * @returns {undefined|boolean|string|number|external:AST}\n */\nfunction getPath(obj, keys) {\n    for (let i = 0; i < keys.length; ++i) {\n        if (obj == null) { return obj; }\n        obj = obj[keys[i]];\n    }\n    return obj;\n}\n\n/**\n * Determine whether `node` can be reached by following `path`,\n * starting at `ancestor`.\n * @param {?external:AST} node\n * @param {?external:AST} ancestor\n * @param {string[]} path\n * @param {Integer} fromPathIndex\n * @returns {boolean}\n */\nfunction inPath(node, ancestor, path, fromPathIndex) {\n    let current = ancestor;\n    for (let i = fromPathIndex; i < path.length; ++i) {\n        if (current == null) {\n            return false;\n        }\n        const field = current[path[i]];\n        if (Array.isArray(field)) {\n            for (let k = 0; k < field.length; ++k) {\n                if (inPath(node, field[k], path, i + 1)) {\n                    return true;\n                }\n            }\n            return false;\n        }\n        current = field;\n    }\n    return node === current;\n}\n\n/**\n * A generated matcher function for a selector.\n * @callback SelectorMatcher\n * @param {?SelectorAST} selector\n * @param {external:AST[]} [ancestry=[]]\n * @param {ESQueryOptions} [options]\n * @returns {void}\n*/\n\n/**\n * A WeakMap for holding cached matcher functions for selectors.\n * @type {WeakMap<SelectorAST, SelectorMatcher>}\n*/\nconst MATCHER_CACHE = typeof WeakMap === 'function' ? new WeakMap : null;\n\n/**\n * Look up a matcher function for `selector` in the cache.\n * If it does not exist, generate it with `generateMatcher` and add it to the cache.\n * In engines without WeakMap, the caching is skipped and matchers are generated with every call.\n * @param {?SelectorAST} selector\n * @returns {SelectorMatcher}\n */\nfunction getMatcher(selector) {\n    if (selector == null) {\n        return () => true;\n    }\n\n    if (MATCHER_CACHE != null) {\n        let matcher = MATCHER_CACHE.get(selector);\n        if (matcher != null) {\n            return matcher;\n        }\n        matcher = generateMatcher(selector);\n        MATCHER_CACHE.set(selector, matcher);\n        return matcher;\n    }\n\n    return generateMatcher(selector);\n}\n\n/**\n * Create a matcher function for `selector`,\n * @param {?SelectorAST} selector\n * @returns {SelectorMatcher}\n */\nfunction generateMatcher(selector) {\n    switch(selector.type) {\n        case 'wildcard':\n            return () => true;\n\n        case 'identifier': {\n            const value = selector.value.toLowerCase();\n            return (node, ancestry, options) => {\n                const nodeTypeKey = (options && options.nodeTypeKey) || 'type';\n                return value === node[nodeTypeKey].toLowerCase();\n            };\n        }\n\n        case 'exactNode':\n            return (node, ancestry) => {\n                return ancestry.length === 0;\n            };\n\n        case 'field': {\n            const path = selector.name.split('.');\n            return (node, ancestry) => {\n                const ancestor = ancestry[path.length - 1];\n                return inPath(node, ancestor, path, 0);\n            };\n        }\n\n        case 'matches': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                for (let i = 0; i < matchers.length; ++i) {\n                    if (matchers[i](node, ancestry, options)) { return true; }\n                }\n                return false;\n            };\n        }\n\n        case 'compound': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                for (let i = 0; i < matchers.length; ++i) {\n                    if (!matchers[i](node, ancestry, options)) { return false; }\n                }\n                return true;\n            };\n        }\n\n        case 'not': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                for (let i = 0; i < matchers.length; ++i) {\n                    if (matchers[i](node, ancestry, options)) { return false; }\n                }\n                return true;\n            };\n        }\n\n        case 'has': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                let result = false;\n\n                const a = [];\n                estraverse.traverse(node, {\n                    enter (node, parent) {\n                        if (parent != null) { a.unshift(parent); }\n\n                        for (let i = 0; i < matchers.length; ++i) {\n                            if (matchers[i](node, a, options)) {\n                                result = true;\n                                this.break();\n                                return;\n                            }\n                        }\n                    },\n                    leave () { a.shift(); },\n                    keys: options && options.visitorKeys,\n                    fallback: options && options.fallback || 'iteration'\n                });\n\n                return result;\n            };\n        }\n\n        case 'child': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) => {\n                if (ancestry.length > 0 && right(node, ancestry, options)) {\n                    return left(ancestry[0], ancestry.slice(1), options);\n                }\n                return false;\n            };\n        }\n\n        case 'descendant': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) => {\n                if (right(node, ancestry, options)) {\n                    for (let i = 0, l = ancestry.length; i < l; ++i) {\n                        if (left(ancestry[i], ancestry.slice(i + 1), options)) {\n                            return true;\n                        }\n                    }\n                }\n                return false;\n            };\n        }\n\n        case 'attribute': {\n            const path = selector.name.split('.');\n            switch (selector.operator) {\n                case void 0:\n                    return (node) => getPath(node, path) != null;\n                case '=':\n                    switch (selector.value.type) {\n                        case 'regexp':\n                            return (node) => {\n                                const p = getPath(node, path);\n                                return typeof p === 'string' && selector.value.value.test(p);\n                            };\n                        case 'literal': {\n                            const literal = `${selector.value.value}`;\n                            return (node) => literal === `${getPath(node, path)}`;\n                        }\n                        case 'type':\n                            return (node) => selector.value.value === typeof getPath(node, path);\n                    }\n                    throw new Error(`Unknown selector value type: ${selector.value.type}`);\n                case '!=':\n                    switch (selector.value.type) {\n                        case 'regexp':\n                            return (node) => !selector.value.value.test(getPath(node, path));\n                        case 'literal': {\n                            const literal = `${selector.value.value}`;\n                            return (node) => literal !== `${getPath(node, path)}`;\n                        }\n                        case 'type':\n                            return (node) => selector.value.value !== typeof getPath(node, path);\n                    }\n                    throw new Error(`Unknown selector value type: ${selector.value.type}`);\n                case '<=':\n                    return (node) => getPath(node, path) <= selector.value.value;\n                case '<':\n                    return (node) => getPath(node, path) < selector.value.value;\n                case '>':\n                    return (node) => getPath(node, path) > selector.value.value;\n                case '>=':\n                    return (node) => getPath(node, path) >= selector.value.value;\n            }\n            throw new Error(`Unknown operator: ${selector.operator}`);\n        }\n\n        case 'sibling': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    sibling(node, left, ancestry, LEFT_SIDE, options) ||\n                    selector.left.subject &&\n                    left(node, ancestry, options) &&\n                    sibling(node, right, ancestry, RIGHT_SIDE, options);\n        }\n\n        case 'adjacent': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    adjacent(node, left, ancestry, LEFT_SIDE, options) ||\n                    selector.right.subject &&\n                    left(node, ancestry, options) &&\n                    adjacent(node, right, ancestry, RIGHT_SIDE, options);\n        }\n\n        case 'nth-child': {\n            const nth = selector.index.value;\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    nthChild(node, ancestry, nth, options);\n        }\n\n        case 'nth-last-child': {\n            const nth = -selector.index.value;\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    nthChild(node, ancestry, nth, options);\n        }\n\n        case 'class': {\n            \n            const name = selector.name.toLowerCase();\n\n            return (node, ancestry, options) => {\n                \n                if (options && options.matchClass) {\n                    return options.matchClass(selector.name, node, ancestry);\n                }\n                \n                if (options && options.nodeTypeKey) return false;    \n\n                switch(name){\n                    case 'statement':\n                        if(node.type.slice(-9) === 'Statement') return true;\n                        // fallthrough: interface Declaration <: Statement { }\n                    case 'declaration':\n                        return node.type.slice(-11) === 'Declaration';\n                    case 'pattern':\n                        if(node.type.slice(-7) === 'Pattern') return true;\n                        // fallthrough: interface Expression <: Node, Pattern { }\n                    case 'expression':\n                        return node.type.slice(-10) === 'Expression' ||\n                            node.type.slice(-7) === 'Literal' ||\n                            (\n                                node.type === 'Identifier' &&\n                                (ancestry.length === 0 || ancestry[0].type !== 'MetaProperty')\n                            ) ||\n                            node.type === 'MetaProperty';\n                    case 'function':\n                        return node.type === 'FunctionDeclaration' ||\n                            node.type === 'FunctionExpression' ||\n                            node.type === 'ArrowFunctionExpression';\n                }\n                throw new Error(`Unknown class name: ${selector.name}`);\n            };\n        }\n    }\n\n    throw new Error(`Unknown selector type: ${selector.type}`);\n}\n\n/**\n * @callback TraverseOptionFallback\n * @param {external:AST} node The given node.\n * @returns {string[]} An array of visitor keys for the given node.\n */\n\n/**\n * @callback ClassMatcher\n * @param {string} className The name of the class to match.\n * @param {external:AST} node The node to match against.\n * @param {Array<external:AST>} ancestry The ancestry of the node.\n * @returns {boolean} True if the node matches the class, false if not.\n */\n\n/**\n * @typedef {object} ESQueryOptions\n * @property {string} [nodeTypeKey=\"type\"] By passing `nodeTypeKey`, we can allow other ASTs to use ESQuery.\n * @property { { [nodeType: string]: string[] } } [visitorKeys] By passing `visitorKeys` mapping, we can extend the properties of the nodes that traverse the node.\n * @property {TraverseOptionFallback} [fallback] By passing `fallback` option, we can control the properties of traversing nodes when encountering unknown nodes.\n * @property {ClassMatcher} [matchClass] By passing `matchClass` option, we can customize the interpretation of classes.\n */\n\n/**\n * Given a `node` and its ancestors, determine if `node` is matched\n * by `selector`.\n * @param {?external:AST} node\n * @param {?SelectorAST} selector\n * @param {external:AST[]} [ancestry=[]]\n * @param {ESQueryOptions} [options]\n * @throws {Error} Unknowns (operator, class name, selector type, or\n * selector value type)\n * @returns {boolean}\n */\nfunction matches(node, selector, ancestry, options) {\n    if (!selector) { return true; }\n    if (!node) { return false; }\n    if (!ancestry) { ancestry = []; }\n\n    return getMatcher(selector)(node, ancestry, options);\n}\n\n/**\n * Get visitor keys of a given node.\n * @param {external:AST} node The AST node to get keys.\n * @param {ESQueryOptions|undefined} options\n * @returns {string[]} Visitor keys of the node.\n */\nfunction getVisitorKeys(node, options) {\n    const nodeTypeKey = (options && options.nodeTypeKey) || 'type';\n\n    const nodeType = node[nodeTypeKey];\n    if (options && options.visitorKeys && options.visitorKeys[nodeType]) {\n        return options.visitorKeys[nodeType];\n    }\n    if (estraverse.VisitorKeys[nodeType]) {\n        return estraverse.VisitorKeys[nodeType];\n    }\n    if (options && typeof options.fallback === 'function') {\n        return options.fallback(node);\n    }\n    // 'iteration' fallback\n    return Object.keys(node).filter(function (key) {\n        return key !== nodeTypeKey;\n    });\n}\n\n\n/**\n * Check whether the given value is an ASTNode or not.\n * @param {any} node The value to check.\n * @param {ESQueryOptions|undefined} options The options to use.\n * @returns {boolean} `true` if the value is an ASTNode.\n */\nfunction isNode(node, options) {\n    const nodeTypeKey = (options && options.nodeTypeKey) || 'type';\n    return node !== null && typeof node === 'object' && typeof node[nodeTypeKey] === 'string';\n}\n\n/**\n * Determines if the given node has a sibling that matches the\n * given selector matcher.\n * @param {external:AST} node\n * @param {SelectorMatcher} matcher\n * @param {external:AST[]} ancestry\n * @param {Side} side\n * @param {ESQueryOptions|undefined} options\n * @returns {boolean}\n */\nfunction sibling(node, matcher, ancestry, side, options) {\n    const [parent] = ancestry;\n    if (!parent) { return false; }\n    const keys = getVisitorKeys(parent, options);\n    for (let i = 0; i < keys.length; ++i) {\n        const listProp = parent[keys[i]];\n        if (Array.isArray(listProp)) {\n            const startIndex = listProp.indexOf(node);\n            if (startIndex < 0) { continue; }\n            let lowerBound, upperBound;\n            if (side === LEFT_SIDE) {\n                lowerBound = 0;\n                upperBound = startIndex;\n            } else {\n                lowerBound = startIndex + 1;\n                upperBound = listProp.length;\n            }\n            for (let k = lowerBound; k < upperBound; ++k) {\n                if (isNode(listProp[k], options) && matcher(listProp[k], ancestry, options)) {\n                    return true;\n                }\n            }\n        }\n    }\n    return false;\n}\n\n/**\n * Determines if the given node has an adjacent sibling that matches\n * the given selector matcher.\n * @param {external:AST} node\n * @param {SelectorMatcher} matcher\n * @param {external:AST[]} ancestry\n * @param {Side} side\n * @param {ESQueryOptions|undefined} options\n * @returns {boolean}\n */\nfunction adjacent(node, matcher, ancestry, side, options) {\n    const [parent] = ancestry;\n    if (!parent) { return false; }\n    const keys = getVisitorKeys(parent, options);\n    for (let i = 0; i < keys.length; ++i) {\n        const listProp = parent[keys[i]];\n        if (Array.isArray(listProp)) {\n            const idx = listProp.indexOf(node);\n            if (idx < 0) { continue; }\n            if (side === LEFT_SIDE && idx > 0 && isNode(listProp[idx - 1], options) && matcher(listProp[idx - 1], ancestry, options)) {\n                return true;\n            }\n            if (side === RIGHT_SIDE && idx < listProp.length - 1 && isNode(listProp[idx + 1], options) &&  matcher(listProp[idx + 1], ancestry, options)) {\n                return true;\n            }\n        }\n    }\n    return false;\n}\n\n/**\n * Determines if the given node is the `nth` child.\n * If `nth` is negative then the position is counted\n * from the end of the list of children.\n * @param {external:AST} node\n * @param {external:AST[]} ancestry\n * @param {Integer} nth\n * @param {ESQueryOptions|undefined} options\n * @returns {boolean}\n */\nfunction nthChild(node, ancestry, nth, options) {\n    if (nth === 0) { return false; }\n    const [parent] = ancestry;\n    if (!parent) { return false; }\n    const keys = getVisitorKeys(parent, options);\n    for (let i = 0; i < keys.length; ++i) {\n        const listProp = parent[keys[i]];\n        if (Array.isArray(listProp)){\n            const idx = nth < 0 ? listProp.length + nth : nth - 1;\n            if (idx >= 0 && idx < listProp.length && listProp[idx] === node) {\n                return true;\n            }\n        }\n    }\n    return false;\n}\n\n/**\n * For each selector node marked as a subject, find the portion of the\n * selector that the subject must match.\n * @param {SelectorAST} selector\n * @param {SelectorAST} [ancestor] Defaults to `selector`\n * @returns {SelectorAST[]}\n */\nfunction subjects(selector, ancestor) {\n    if (selector == null || typeof selector != 'object') { return []; }\n    if (ancestor == null) { ancestor = selector; }\n    const results = selector.subject ? [ancestor] : [];\n    const keys = Object.keys(selector);\n    for (let i = 0; i < keys.length; ++i) {\n        const p = keys[i];\n        const sel = selector[p];\n        results.push(...subjects(sel, p === 'left' ? sel : ancestor));\n    }\n    return results;\n}\n\n/**\n* @callback TraverseVisitor\n* @param {?external:AST} node\n* @param {?external:AST} parent\n* @param {external:AST[]} ancestry\n*/\n\n/**\n * From a JS AST and a selector AST, collect all JS AST nodes that\n * match the selector.\n * @param {external:AST} ast\n * @param {?SelectorAST} selector\n * @param {TraverseVisitor} visitor\n * @param {ESQueryOptions} [options]\n * @returns {external:AST[]}\n */\nfunction traverse(ast, selector, visitor, options) {\n    if (!selector) { return; }\n    const ancestry = [];\n    const matcher = getMatcher(selector);\n    const altSubjects = subjects(selector).map(getMatcher);\n    estraverse.traverse(ast, {\n        enter (node, parent) {\n            if (parent != null) { ancestry.unshift(parent); }\n            if (matcher(node, ancestry, options)) {\n                if (altSubjects.length) {\n                    for (let i = 0, l = altSubjects.length; i < l; ++i) {\n                        if (altSubjects[i](node, ancestry, options)) {\n                            visitor(node, parent, ancestry);\n                        }\n                        for (let k = 0, m = ancestry.length; k < m; ++k) {\n                            const succeedingAncestry = ancestry.slice(k + 1);\n                            if (altSubjects[i](ancestry[k], succeedingAncestry, options)) {\n                                visitor(ancestry[k], parent, succeedingAncestry);\n                            }\n                        }\n                    }\n                } else {\n                    visitor(node, parent, ancestry);\n                }\n            }\n        },\n        leave () { ancestry.shift(); },\n        keys: options && options.visitorKeys,\n        fallback: options && options.fallback || 'iteration'\n    });\n}\n\n\n/**\n * From a JS AST and a selector AST, collect all JS AST nodes that\n * match the selector.\n * @param {external:AST} ast\n * @param {?SelectorAST} selector\n * @param {ESQueryOptions} [options]\n * @returns {external:AST[]}\n */\nfunction match(ast, selector, options) {\n    const results = [];\n    traverse(ast, selector, function (node) {\n        results.push(node);\n    }, options);\n    return results;\n}\n\n/**\n * Parse a selector string and return its AST.\n * @param {string} selector\n * @returns {SelectorAST}\n */\nfunction parse(selector) {\n    return parser.parse(selector);\n}\n\n/**\n * Query the code AST using the selector string.\n * @param {external:AST} ast\n * @param {string} selector\n * @param {ESQueryOptions} [options]\n * @returns {external:AST[]}\n */\nfunction query(ast, selector, options) {\n    return match(ast, parse(selector), options);\n}\n\nquery.parse = parse;\nquery.match = 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Index: frontend/node_modules/esquery/dist/esquery.js
===================================================================
--- frontend/node_modules/esquery/dist/esquery.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/dist/esquery.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,4426 @@
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+  typeof define === 'function' && define.amd ? define(factory) :
+  (global = global || self, global.esquery = factory());
+}(this, (function () { 'use strict';
+
+  function _arrayLikeToArray(r, a) {
+    (null == a || a > r.length) && (a = r.length);
+    for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e];
+    return n;
+  }
+  function _arrayWithHoles(r) {
+    if (Array.isArray(r)) return r;
+  }
+  function _arrayWithoutHoles(r) {
+    if (Array.isArray(r)) return _arrayLikeToArray(r);
+  }
+  function _iterableToArray(r) {
+    if ("undefined" != typeof Symbol && null != r[Symbol.iterator] || null != r["@@iterator"]) return Array.from(r);
+  }
+  function _iterableToArrayLimit(r, l) {
+    var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"];
+    if (null != t) {
+      var e,
+        n,
+        i,
+        u,
+        a = [],
+        f = !0,
+        o = !1;
+      try {
+        if (i = (t = t.call(r)).next, 0 === l) {
+          if (Object(t) !== t) return;
+          f = !1;
+        } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0);
+      } catch (r) {
+        o = !0, n = r;
+      } finally {
+        try {
+          if (!f && null != t.return && (u = t.return(), Object(u) !== u)) return;
+        } finally {
+          if (o) throw n;
+        }
+      }
+      return a;
+    }
+  }
+  function _nonIterableRest() {
+    throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+  }
+  function _nonIterableSpread() {
+    throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+  }
+  function _slicedToArray(r, e) {
+    return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _nonIterableRest();
+  }
+  function _toConsumableArray(r) {
+    return _arrayWithoutHoles(r) || _iterableToArray(r) || _unsupportedIterableToArray(r) || _nonIterableSpread();
+  }
+  function _typeof(o) {
+    "@babel/helpers - typeof";
+
+    return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) {
+      return typeof o;
+    } : function (o) {
+      return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o;
+    }, _typeof(o);
+  }
+  function _unsupportedIterableToArray(r, a) {
+    if (r) {
+      if ("string" == typeof r) return _arrayLikeToArray(r, a);
+      var t = {}.toString.call(r).slice(8, -1);
+      return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0;
+    }
+  }
+
+  var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};
+
+  function createCommonjsModule(fn, module) {
+  	return module = { exports: {} }, fn(module, module.exports), module.exports;
+  }
+
+  var estraverse = createCommonjsModule(function (module, exports) {
+    /*
+      Copyright (C) 2012-2013 Yusuke Suzuki <utatane.tea@gmail.com>
+      Copyright (C) 2012 Ariya Hidayat <ariya.hidayat@gmail.com>
+    
+      Redistribution and use in source and binary forms, with or without
+      modification, are permitted provided that the following conditions are met:
+    
+        * Redistributions of source code must retain the above copyright
+          notice, this list of conditions and the following disclaimer.
+        * Redistributions in binary form must reproduce the above copyright
+          notice, this list of conditions and the following disclaimer in the
+          documentation and/or other materials provided with the distribution.
+    
+      THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+      AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+      IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+      ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+      DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+      (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+      LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+      ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+      (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+      THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+    */
+    /*jslint vars:false, bitwise:true*/
+    /*jshint indent:4*/
+    /*global exports:true*/
+    (function clone(exports) {
+
+      var Syntax, VisitorOption, VisitorKeys, BREAK, SKIP, REMOVE;
+      function deepCopy(obj) {
+        var ret = {},
+          key,
+          val;
+        for (key in obj) {
+          if (obj.hasOwnProperty(key)) {
+            val = obj[key];
+            if (typeof val === 'object' && val !== null) {
+              ret[key] = deepCopy(val);
+            } else {
+              ret[key] = val;
+            }
+          }
+        }
+        return ret;
+      }
+
+      // based on LLVM libc++ upper_bound / lower_bound
+      // MIT License
+
+      function upperBound(array, func) {
+        var diff, len, i, current;
+        len = array.length;
+        i = 0;
+        while (len) {
+          diff = len >>> 1;
+          current = i + diff;
+          if (func(array[current])) {
+            len = diff;
+          } else {
+            i = current + 1;
+            len -= diff + 1;
+          }
+        }
+        return i;
+      }
+      Syntax = {
+        AssignmentExpression: 'AssignmentExpression',
+        AssignmentPattern: 'AssignmentPattern',
+        ArrayExpression: 'ArrayExpression',
+        ArrayPattern: 'ArrayPattern',
+        ArrowFunctionExpression: 'ArrowFunctionExpression',
+        AwaitExpression: 'AwaitExpression',
+        // CAUTION: It's deferred to ES7.
+        BlockStatement: 'BlockStatement',
+        BinaryExpression: 'BinaryExpression',
+        BreakStatement: 'BreakStatement',
+        CallExpression: 'CallExpression',
+        CatchClause: 'CatchClause',
+        ChainExpression: 'ChainExpression',
+        ClassBody: 'ClassBody',
+        ClassDeclaration: 'ClassDeclaration',
+        ClassExpression: 'ClassExpression',
+        ComprehensionBlock: 'ComprehensionBlock',
+        // CAUTION: It's deferred to ES7.
+        ComprehensionExpression: 'ComprehensionExpression',
+        // CAUTION: It's deferred to ES7.
+        ConditionalExpression: 'ConditionalExpression',
+        ContinueStatement: 'ContinueStatement',
+        DebuggerStatement: 'DebuggerStatement',
+        DirectiveStatement: 'DirectiveStatement',
+        DoWhileStatement: 'DoWhileStatement',
+        EmptyStatement: 'EmptyStatement',
+        ExportAllDeclaration: 'ExportAllDeclaration',
+        ExportDefaultDeclaration: 'ExportDefaultDeclaration',
+        ExportNamedDeclaration: 'ExportNamedDeclaration',
+        ExportSpecifier: 'ExportSpecifier',
+        ExpressionStatement: 'ExpressionStatement',
+        ForStatement: 'ForStatement',
+        ForInStatement: 'ForInStatement',
+        ForOfStatement: 'ForOfStatement',
+        FunctionDeclaration: 'FunctionDeclaration',
+        FunctionExpression: 'FunctionExpression',
+        GeneratorExpression: 'GeneratorExpression',
+        // CAUTION: It's deferred to ES7.
+        Identifier: 'Identifier',
+        IfStatement: 'IfStatement',
+        ImportExpression: 'ImportExpression',
+        ImportDeclaration: 'ImportDeclaration',
+        ImportDefaultSpecifier: 'ImportDefaultSpecifier',
+        ImportNamespaceSpecifier: 'ImportNamespaceSpecifier',
+        ImportSpecifier: 'ImportSpecifier',
+        Literal: 'Literal',
+        LabeledStatement: 'LabeledStatement',
+        LogicalExpression: 'LogicalExpression',
+        MemberExpression: 'MemberExpression',
+        MetaProperty: 'MetaProperty',
+        MethodDefinition: 'MethodDefinition',
+        ModuleSpecifier: 'ModuleSpecifier',
+        NewExpression: 'NewExpression',
+        ObjectExpression: 'ObjectExpression',
+        ObjectPattern: 'ObjectPattern',
+        PrivateIdentifier: 'PrivateIdentifier',
+        Program: 'Program',
+        Property: 'Property',
+        PropertyDefinition: 'PropertyDefinition',
+        RestElement: 'RestElement',
+        ReturnStatement: 'ReturnStatement',
+        SequenceExpression: 'SequenceExpression',
+        SpreadElement: 'SpreadElement',
+        Super: 'Super',
+        SwitchStatement: 'SwitchStatement',
+        SwitchCase: 'SwitchCase',
+        TaggedTemplateExpression: 'TaggedTemplateExpression',
+        TemplateElement: 'TemplateElement',
+        TemplateLiteral: 'TemplateLiteral',
+        ThisExpression: 'ThisExpression',
+        ThrowStatement: 'ThrowStatement',
+        TryStatement: 'TryStatement',
+        UnaryExpression: 'UnaryExpression',
+        UpdateExpression: 'UpdateExpression',
+        VariableDeclaration: 'VariableDeclaration',
+        VariableDeclarator: 'VariableDeclarator',
+        WhileStatement: 'WhileStatement',
+        WithStatement: 'WithStatement',
+        YieldExpression: 'YieldExpression'
+      };
+      VisitorKeys = {
+        AssignmentExpression: ['left', 'right'],
+        AssignmentPattern: ['left', 'right'],
+        ArrayExpression: ['elements'],
+        ArrayPattern: ['elements'],
+        ArrowFunctionExpression: ['params', 'body'],
+        AwaitExpression: ['argument'],
+        // CAUTION: It's deferred to ES7.
+        BlockStatement: ['body'],
+        BinaryExpression: ['left', 'right'],
+        BreakStatement: ['label'],
+        CallExpression: ['callee', 'arguments'],
+        CatchClause: ['param', 'body'],
+        ChainExpression: ['expression'],
+        ClassBody: ['body'],
+        ClassDeclaration: ['id', 'superClass', 'body'],
+        ClassExpression: ['id', 'superClass', 'body'],
+        ComprehensionBlock: ['left', 'right'],
+        // CAUTION: It's deferred to ES7.
+        ComprehensionExpression: ['blocks', 'filter', 'body'],
+        // CAUTION: It's deferred to ES7.
+        ConditionalExpression: ['test', 'consequent', 'alternate'],
+        ContinueStatement: ['label'],
+        DebuggerStatement: [],
+        DirectiveStatement: [],
+        DoWhileStatement: ['body', 'test'],
+        EmptyStatement: [],
+        ExportAllDeclaration: ['source'],
+        ExportDefaultDeclaration: ['declaration'],
+        ExportNamedDeclaration: ['declaration', 'specifiers', 'source'],
+        ExportSpecifier: ['exported', 'local'],
+        ExpressionStatement: ['expression'],
+        ForStatement: ['init', 'test', 'update', 'body'],
+        ForInStatement: ['left', 'right', 'body'],
+        ForOfStatement: ['left', 'right', 'body'],
+        FunctionDeclaration: ['id', 'params', 'body'],
+        FunctionExpression: ['id', 'params', 'body'],
+        GeneratorExpression: ['blocks', 'filter', 'body'],
+        // CAUTION: It's deferred to ES7.
+        Identifier: [],
+        IfStatement: ['test', 'consequent', 'alternate'],
+        ImportExpression: ['source'],
+        ImportDeclaration: ['specifiers', 'source'],
+        ImportDefaultSpecifier: ['local'],
+        ImportNamespaceSpecifier: ['local'],
+        ImportSpecifier: ['imported', 'local'],
+        Literal: [],
+        LabeledStatement: ['label', 'body'],
+        LogicalExpression: ['left', 'right'],
+        MemberExpression: ['object', 'property'],
+        MetaProperty: ['meta', 'property'],
+        MethodDefinition: ['key', 'value'],
+        ModuleSpecifier: [],
+        NewExpression: ['callee', 'arguments'],
+        ObjectExpression: ['properties'],
+        ObjectPattern: ['properties'],
+        PrivateIdentifier: [],
+        Program: ['body'],
+        Property: ['key', 'value'],
+        PropertyDefinition: ['key', 'value'],
+        RestElement: ['argument'],
+        ReturnStatement: ['argument'],
+        SequenceExpression: ['expressions'],
+        SpreadElement: ['argument'],
+        Super: [],
+        SwitchStatement: ['discriminant', 'cases'],
+        SwitchCase: ['test', 'consequent'],
+        TaggedTemplateExpression: ['tag', 'quasi'],
+        TemplateElement: [],
+        TemplateLiteral: ['quasis', 'expressions'],
+        ThisExpression: [],
+        ThrowStatement: ['argument'],
+        TryStatement: ['block', 'handler', 'finalizer'],
+        UnaryExpression: ['argument'],
+        UpdateExpression: ['argument'],
+        VariableDeclaration: ['declarations'],
+        VariableDeclarator: ['id', 'init'],
+        WhileStatement: ['test', 'body'],
+        WithStatement: ['object', 'body'],
+        YieldExpression: ['argument']
+      };
+
+      // unique id
+      BREAK = {};
+      SKIP = {};
+      REMOVE = {};
+      VisitorOption = {
+        Break: BREAK,
+        Skip: SKIP,
+        Remove: REMOVE
+      };
+      function Reference(parent, key) {
+        this.parent = parent;
+        this.key = key;
+      }
+      Reference.prototype.replace = function replace(node) {
+        this.parent[this.key] = node;
+      };
+      Reference.prototype.remove = function remove() {
+        if (Array.isArray(this.parent)) {
+          this.parent.splice(this.key, 1);
+          return true;
+        } else {
+          this.replace(null);
+          return false;
+        }
+      };
+      function Element(node, path, wrap, ref) {
+        this.node = node;
+        this.path = path;
+        this.wrap = wrap;
+        this.ref = ref;
+      }
+      function Controller() {}
+
+      // API:
+      // return property path array from root to current node
+      Controller.prototype.path = function path() {
+        var i, iz, j, jz, result, element;
+        function addToPath(result, path) {
+          if (Array.isArray(path)) {
+            for (j = 0, jz = path.length; j < jz; ++j) {
+              result.push(path[j]);
+            }
+          } else {
+            result.push(path);
+          }
+        }
+
+        // root node
+        if (!this.__current.path) {
+          return null;
+        }
+
+        // first node is sentinel, second node is root element
+        result = [];
+        for (i = 2, iz = this.__leavelist.length; i < iz; ++i) {
+          element = this.__leavelist[i];
+          addToPath(result, element.path);
+        }
+        addToPath(result, this.__current.path);
+        return result;
+      };
+
+      // API:
+      // return type of current node
+      Controller.prototype.type = function () {
+        var node = this.current();
+        return node.type || this.__current.wrap;
+      };
+
+      // API:
+      // return array of parent elements
+      Controller.prototype.parents = function parents() {
+        var i, iz, result;
+
+        // first node is sentinel
+        result = [];
+        for (i = 1, iz = this.__leavelist.length; i < iz; ++i) {
+          result.push(this.__leavelist[i].node);
+        }
+        return result;
+      };
+
+      // API:
+      // return current node
+      Controller.prototype.current = function current() {
+        return this.__current.node;
+      };
+      Controller.prototype.__execute = function __execute(callback, element) {
+        var previous, result;
+        result = undefined;
+        previous = this.__current;
+        this.__current = element;
+        this.__state = null;
+        if (callback) {
+          result = callback.call(this, element.node, this.__leavelist[this.__leavelist.length - 1].node);
+        }
+        this.__current = previous;
+        return result;
+      };
+
+      // API:
+      // notify control skip / break
+      Controller.prototype.notify = function notify(flag) {
+        this.__state = flag;
+      };
+
+      // API:
+      // skip child nodes of current node
+      Controller.prototype.skip = function () {
+        this.notify(SKIP);
+      };
+
+      // API:
+      // break traversals
+      Controller.prototype['break'] = function () {
+        this.notify(BREAK);
+      };
+
+      // API:
+      // remove node
+      Controller.prototype.remove = function () {
+        this.notify(REMOVE);
+      };
+      Controller.prototype.__initialize = function (root, visitor) {
+        this.visitor = visitor;
+        this.root = root;
+        this.__worklist = [];
+        this.__leavelist = [];
+        this.__current = null;
+        this.__state = null;
+        this.__fallback = null;
+        if (visitor.fallback === 'iteration') {
+          this.__fallback = Object.keys;
+        } else if (typeof visitor.fallback === 'function') {
+          this.__fallback = visitor.fallback;
+        }
+        this.__keys = VisitorKeys;
+        if (visitor.keys) {
+          this.__keys = Object.assign(Object.create(this.__keys), visitor.keys);
+        }
+      };
+      function isNode(node) {
+        if (node == null) {
+          return false;
+        }
+        return typeof node === 'object' && typeof node.type === 'string';
+      }
+      function isProperty(nodeType, key) {
+        return (nodeType === Syntax.ObjectExpression || nodeType === Syntax.ObjectPattern) && 'properties' === key;
+      }
+      function candidateExistsInLeaveList(leavelist, candidate) {
+        for (var i = leavelist.length - 1; i >= 0; --i) {
+          if (leavelist[i].node === candidate) {
+            return true;
+          }
+        }
+        return false;
+      }
+      Controller.prototype.traverse = function traverse(root, visitor) {
+        var worklist, leavelist, element, node, nodeType, ret, key, current, current2, candidates, candidate, sentinel;
+        this.__initialize(root, visitor);
+        sentinel = {};
+
+        // reference
+        worklist = this.__worklist;
+        leavelist = this.__leavelist;
+
+        // initialize
+        worklist.push(new Element(root, null, null, null));
+        leavelist.push(new Element(null, null, null, null));
+        while (worklist.length) {
+          element = worklist.pop();
+          if (element === sentinel) {
+            element = leavelist.pop();
+            ret = this.__execute(visitor.leave, element);
+            if (this.__state === BREAK || ret === BREAK) {
+              return;
+            }
+            continue;
+          }
+          if (element.node) {
+            ret = this.__execute(visitor.enter, element);
+            if (this.__state === BREAK || ret === BREAK) {
+              return;
+            }
+            worklist.push(sentinel);
+            leavelist.push(element);
+            if (this.__state === SKIP || ret === SKIP) {
+              continue;
+            }
+            node = element.node;
+            nodeType = node.type || element.wrap;
+            candidates = this.__keys[nodeType];
+            if (!candidates) {
+              if (this.__fallback) {
+                candidates = this.__fallback(node);
+              } else {
+                throw new Error('Unknown node type ' + nodeType + '.');
+              }
+            }
+            current = candidates.length;
+            while ((current -= 1) >= 0) {
+              key = candidates[current];
+              candidate = node[key];
+              if (!candidate) {
+                continue;
+              }
+              if (Array.isArray(candidate)) {
+                current2 = candidate.length;
+                while ((current2 -= 1) >= 0) {
+                  if (!candidate[current2]) {
+                    continue;
+                  }
+                  if (candidateExistsInLeaveList(leavelist, candidate[current2])) {
+                    continue;
+                  }
+                  if (isProperty(nodeType, candidates[current])) {
+                    element = new Element(candidate[current2], [key, current2], 'Property', null);
+                  } else if (isNode(candidate[current2])) {
+                    element = new Element(candidate[current2], [key, current2], null, null);
+                  } else {
+                    continue;
+                  }
+                  worklist.push(element);
+                }
+              } else if (isNode(candidate)) {
+                if (candidateExistsInLeaveList(leavelist, candidate)) {
+                  continue;
+                }
+                worklist.push(new Element(candidate, key, null, null));
+              }
+            }
+          }
+        }
+      };
+      Controller.prototype.replace = function replace(root, visitor) {
+        var worklist, leavelist, node, nodeType, target, element, current, current2, candidates, candidate, sentinel, outer, key;
+        function removeElem(element) {
+          var i, key, nextElem, parent;
+          if (element.ref.remove()) {
+            // When the reference is an element of an array.
+            key = element.ref.key;
+            parent = element.ref.parent;
+
+            // If removed from array, then decrease following items' keys.
+            i = worklist.length;
+            while (i--) {
+              nextElem = worklist[i];
+              if (nextElem.ref && nextElem.ref.parent === parent) {
+                if (nextElem.ref.key < key) {
+                  break;
+                }
+                --nextElem.ref.key;
+              }
+            }
+          }
+        }
+        this.__initialize(root, visitor);
+        sentinel = {};
+
+        // reference
+        worklist = this.__worklist;
+        leavelist = this.__leavelist;
+
+        // initialize
+        outer = {
+          root: root
+        };
+        element = new Element(root, null, null, new Reference(outer, 'root'));
+        worklist.push(element);
+        leavelist.push(element);
+        while (worklist.length) {
+          element = worklist.pop();
+          if (element === sentinel) {
+            element = leavelist.pop();
+            target = this.__execute(visitor.leave, element);
+
+            // node may be replaced with null,
+            // so distinguish between undefined and null in this place
+            if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {
+              // replace
+              element.ref.replace(target);
+            }
+            if (this.__state === REMOVE || target === REMOVE) {
+              removeElem(element);
+            }
+            if (this.__state === BREAK || target === BREAK) {
+              return outer.root;
+            }
+            continue;
+          }
+          target = this.__execute(visitor.enter, element);
+
+          // node may be replaced with null,
+          // so distinguish between undefined and null in this place
+          if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {
+            // replace
+            element.ref.replace(target);
+            element.node = target;
+          }
+          if (this.__state === REMOVE || target === REMOVE) {
+            removeElem(element);
+            element.node = null;
+          }
+          if (this.__state === BREAK || target === BREAK) {
+            return outer.root;
+          }
+
+          // node may be null
+          node = element.node;
+          if (!node) {
+            continue;
+          }
+          worklist.push(sentinel);
+          leavelist.push(element);
+          if (this.__state === SKIP || target === SKIP) {
+            continue;
+          }
+          nodeType = node.type || element.wrap;
+          candidates = this.__keys[nodeType];
+          if (!candidates) {
+            if (this.__fallback) {
+              candidates = this.__fallback(node);
+            } else {
+              throw new Error('Unknown node type ' + nodeType + '.');
+            }
+          }
+          current = candidates.length;
+          while ((current -= 1) >= 0) {
+            key = candidates[current];
+            candidate = node[key];
+            if (!candidate) {
+              continue;
+            }
+            if (Array.isArray(candidate)) {
+              current2 = candidate.length;
+              while ((current2 -= 1) >= 0) {
+                if (!candidate[current2]) {
+                  continue;
+                }
+                if (isProperty(nodeType, candidates[current])) {
+                  element = new Element(candidate[current2], [key, current2], 'Property', new Reference(candidate, current2));
+                } else if (isNode(candidate[current2])) {
+                  element = new Element(candidate[current2], [key, current2], null, new Reference(candidate, current2));
+                } else {
+                  continue;
+                }
+                worklist.push(element);
+              }
+            } else if (isNode(candidate)) {
+              worklist.push(new Element(candidate, key, null, new Reference(node, key)));
+            }
+          }
+        }
+        return outer.root;
+      };
+      function traverse(root, visitor) {
+        var controller = new Controller();
+        return controller.traverse(root, visitor);
+      }
+      function replace(root, visitor) {
+        var controller = new Controller();
+        return controller.replace(root, visitor);
+      }
+      function extendCommentRange(comment, tokens) {
+        var target;
+        target = upperBound(tokens, function search(token) {
+          return token.range[0] > comment.range[0];
+        });
+        comment.extendedRange = [comment.range[0], comment.range[1]];
+        if (target !== tokens.length) {
+          comment.extendedRange[1] = tokens[target].range[0];
+        }
+        target -= 1;
+        if (target >= 0) {
+          comment.extendedRange[0] = tokens[target].range[1];
+        }
+        return comment;
+      }
+      function attachComments(tree, providedComments, tokens) {
+        // At first, we should calculate extended comment ranges.
+        var comments = [],
+          comment,
+          len,
+          i,
+          cursor;
+        if (!tree.range) {
+          throw new Error('attachComments needs range information');
+        }
+
+        // tokens array is empty, we attach comments to tree as 'leadingComments'
+        if (!tokens.length) {
+          if (providedComments.length) {
+            for (i = 0, len = providedComments.length; i < len; i += 1) {
+              comment = deepCopy(providedComments[i]);
+              comment.extendedRange = [0, tree.range[0]];
+              comments.push(comment);
+            }
+            tree.leadingComments = comments;
+          }
+          return tree;
+        }
+        for (i = 0, len = providedComments.length; i < len; i += 1) {
+          comments.push(extendCommentRange(deepCopy(providedComments[i]), tokens));
+        }
+
+        // This is based on John Freeman's implementation.
+        cursor = 0;
+        traverse(tree, {
+          enter: function (node) {
+            var comment;
+            while (cursor < comments.length) {
+              comment = comments[cursor];
+              if (comment.extendedRange[1] > node.range[0]) {
+                break;
+              }
+              if (comment.extendedRange[1] === node.range[0]) {
+                if (!node.leadingComments) {
+                  node.leadingComments = [];
+                }
+                node.leadingComments.push(comment);
+                comments.splice(cursor, 1);
+              } else {
+                cursor += 1;
+              }
+            }
+
+            // already out of owned node
+            if (cursor === comments.length) {
+              return VisitorOption.Break;
+            }
+            if (comments[cursor].extendedRange[0] > node.range[1]) {
+              return VisitorOption.Skip;
+            }
+          }
+        });
+        cursor = 0;
+        traverse(tree, {
+          leave: function (node) {
+            var comment;
+            while (cursor < comments.length) {
+              comment = comments[cursor];
+              if (node.range[1] < comment.extendedRange[0]) {
+                break;
+              }
+              if (node.range[1] === comment.extendedRange[0]) {
+                if (!node.trailingComments) {
+                  node.trailingComments = [];
+                }
+                node.trailingComments.push(comment);
+                comments.splice(cursor, 1);
+              } else {
+                cursor += 1;
+              }
+            }
+
+            // already out of owned node
+            if (cursor === comments.length) {
+              return VisitorOption.Break;
+            }
+            if (comments[cursor].extendedRange[0] > node.range[1]) {
+              return VisitorOption.Skip;
+            }
+          }
+        });
+        return tree;
+      }
+      exports.Syntax = Syntax;
+      exports.traverse = traverse;
+      exports.replace = replace;
+      exports.attachComments = attachComments;
+      exports.VisitorKeys = VisitorKeys;
+      exports.VisitorOption = VisitorOption;
+      exports.Controller = Controller;
+      exports.cloneEnvironment = function () {
+        return clone({});
+      };
+      return exports;
+    })(exports);
+    /* vim: set sw=4 ts=4 et tw=80 : */
+  });
+
+  var parser = createCommonjsModule(function (module) {
+    /*
+     * Generated by PEG.js 0.10.0.
+     *
+     * http://pegjs.org/
+     */
+    (function (root, factory) {
+      if ( module.exports) {
+        module.exports = factory();
+      }
+    })(commonjsGlobal, function () {
+
+      function peg$subclass(child, parent) {
+        function ctor() {
+          this.constructor = child;
+        }
+        ctor.prototype = parent.prototype;
+        child.prototype = new ctor();
+      }
+      function peg$SyntaxError(message, expected, found, location) {
+        this.message = message;
+        this.expected = expected;
+        this.found = found;
+        this.location = location;
+        this.name = "SyntaxError";
+        if (typeof Error.captureStackTrace === "function") {
+          Error.captureStackTrace(this, peg$SyntaxError);
+        }
+      }
+      peg$subclass(peg$SyntaxError, Error);
+      peg$SyntaxError.buildMessage = function (expected, found) {
+        var DESCRIBE_EXPECTATION_FNS = {
+          literal: function literal(expectation) {
+            return "\"" + literalEscape(expectation.text) + "\"";
+          },
+          "class": function _class(expectation) {
+            var escapedParts = "",
+              i;
+            for (i = 0; i < expectation.parts.length; i++) {
+              escapedParts += expectation.parts[i] instanceof Array ? classEscape(expectation.parts[i][0]) + "-" + classEscape(expectation.parts[i][1]) : classEscape(expectation.parts[i]);
+            }
+            return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
+          },
+          any: function any(expectation) {
+            return "any character";
+          },
+          end: function end(expectation) {
+            return "end of input";
+          },
+          other: function other(expectation) {
+            return expectation.description;
+          }
+        };
+        function hex(ch) {
+          return ch.charCodeAt(0).toString(16).toUpperCase();
+        }
+        function literalEscape(s) {
+          return s.replace(/\\/g, '\\\\').replace(/"/g, '\\"').replace(/\0/g, '\\0').replace(/\t/g, '\\t').replace(/\n/g, '\\n').replace(/\r/g, '\\r').replace(/[\x00-\x0F]/g, function (ch) {
+            return '\\x0' + hex(ch);
+          }).replace(/[\x10-\x1F\x7F-\x9F]/g, function (ch) {
+            return '\\x' + hex(ch);
+          });
+        }
+        function classEscape(s) {
+          return s.replace(/\\/g, '\\\\').replace(/\]/g, '\\]').replace(/\^/g, '\\^').replace(/-/g, '\\-').replace(/\0/g, '\\0').replace(/\t/g, '\\t').replace(/\n/g, '\\n').replace(/\r/g, '\\r').replace(/[\x00-\x0F]/g, function (ch) {
+            return '\\x0' + hex(ch);
+          }).replace(/[\x10-\x1F\x7F-\x9F]/g, function (ch) {
+            return '\\x' + hex(ch);
+          });
+        }
+        function describeExpectation(expectation) {
+          return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
+        }
+        function describeExpected(expected) {
+          var descriptions = new Array(expected.length),
+            i,
+            j;
+          for (i = 0; i < expected.length; i++) {
+            descriptions[i] = describeExpectation(expected[i]);
+          }
+          descriptions.sort();
+          if (descriptions.length > 0) {
+            for (i = 1, j = 1; i < descriptions.length; i++) {
+              if (descriptions[i - 1] !== descriptions[i]) {
+                descriptions[j] = descriptions[i];
+                j++;
+              }
+            }
+            descriptions.length = j;
+          }
+          switch (descriptions.length) {
+            case 1:
+              return descriptions[0];
+            case 2:
+              return descriptions[0] + " or " + descriptions[1];
+            default:
+              return descriptions.slice(0, -1).join(", ") + ", or " + descriptions[descriptions.length - 1];
+          }
+        }
+        function describeFound(found) {
+          return found ? "\"" + literalEscape(found) + "\"" : "end of input";
+        }
+        return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
+      };
+      function peg$parse(input, options) {
+        options = options !== void 0 ? options : {};
+        var peg$FAILED = {},
+          peg$startRuleFunctions = {
+            start: peg$parsestart
+          },
+          peg$startRuleFunction = peg$parsestart,
+          peg$c0 = function peg$c0(ss) {
+            return ss.length === 1 ? ss[0] : {
+              type: 'matches',
+              selectors: ss
+            };
+          },
+          peg$c1 = function peg$c1() {
+            return void 0;
+          },
+          peg$c2 = " ",
+          peg$c3 = peg$literalExpectation(" ", false),
+          peg$c4 = /^[^ [\],():#!=><~+.]/,
+          peg$c5 = peg$classExpectation([" ", "[", "]", ",", "(", ")", ":", "#", "!", "=", ">", "<", "~", "+", "."], true, false),
+          peg$c6 = function peg$c6(i) {
+            return i.join('');
+          },
+          peg$c7 = ">",
+          peg$c8 = peg$literalExpectation(">", false),
+          peg$c9 = function peg$c9() {
+            return 'child';
+          },
+          peg$c10 = "~",
+          peg$c11 = peg$literalExpectation("~", false),
+          peg$c12 = function peg$c12() {
+            return 'sibling';
+          },
+          peg$c13 = "+",
+          peg$c14 = peg$literalExpectation("+", false),
+          peg$c15 = function peg$c15() {
+            return 'adjacent';
+          },
+          peg$c16 = function peg$c16() {
+            return 'descendant';
+          },
+          peg$c17 = ",",
+          peg$c18 = peg$literalExpectation(",", false),
+          peg$c19 = function peg$c19(s, ss) {
+            return [s].concat(ss.map(function (s) {
+              return s[3];
+            }));
+          },
+          peg$c20 = function peg$c20(op, s) {
+            if (!op) return s;
+            return {
+              type: op,
+              left: {
+                type: 'exactNode'
+              },
+              right: s
+            };
+          },
+          peg$c21 = function peg$c21(a, ops) {
+            return ops.reduce(function (memo, rhs) {
+              return {
+                type: rhs[0],
+                left: memo,
+                right: rhs[1]
+              };
+            }, a);
+          },
+          peg$c22 = "!",
+          peg$c23 = peg$literalExpectation("!", false),
+          peg$c24 = function peg$c24(subject, as) {
+            var b = as.length === 1 ? as[0] : {
+              type: 'compound',
+              selectors: as
+            };
+            if (subject) b.subject = true;
+            return b;
+          },
+          peg$c25 = "*",
+          peg$c26 = peg$literalExpectation("*", false),
+          peg$c27 = function peg$c27(a) {
+            return {
+              type: 'wildcard',
+              value: a
+            };
+          },
+          peg$c28 = "#",
+          peg$c29 = peg$literalExpectation("#", false),
+          peg$c30 = function peg$c30(i) {
+            return {
+              type: 'identifier',
+              value: i
+            };
+          },
+          peg$c31 = "[",
+          peg$c32 = peg$literalExpectation("[", false),
+          peg$c33 = "]",
+          peg$c34 = peg$literalExpectation("]", false),
+          peg$c35 = function peg$c35(v) {
+            return v;
+          },
+          peg$c36 = /^[><!]/,
+          peg$c37 = peg$classExpectation([">", "<", "!"], false, false),
+          peg$c38 = "=",
+          peg$c39 = peg$literalExpectation("=", false),
+          peg$c40 = function peg$c40(a) {
+            return (a || '') + '=';
+          },
+          peg$c41 = /^[><]/,
+          peg$c42 = peg$classExpectation([">", "<"], false, false),
+          peg$c43 = ".",
+          peg$c44 = peg$literalExpectation(".", false),
+          peg$c45 = function peg$c45(a, as) {
+            return [].concat.apply([a], as).join('');
+          },
+          peg$c46 = function peg$c46(name, op, value) {
+            return {
+              type: 'attribute',
+              name: name,
+              operator: op,
+              value: value
+            };
+          },
+          peg$c47 = function peg$c47(name) {
+            return {
+              type: 'attribute',
+              name: name
+            };
+          },
+          peg$c48 = "\"",
+          peg$c49 = peg$literalExpectation("\"", false),
+          peg$c50 = /^[^\\"]/,
+          peg$c51 = peg$classExpectation(["\\", "\""], true, false),
+          peg$c52 = "\\",
+          peg$c53 = peg$literalExpectation("\\", false),
+          peg$c54 = peg$anyExpectation(),
+          peg$c55 = function peg$c55(a, b) {
+            return a + b;
+          },
+          peg$c56 = function peg$c56(d) {
+            return {
+              type: 'literal',
+              value: strUnescape(d.join(''))
+            };
+          },
+          peg$c57 = "'",
+          peg$c58 = peg$literalExpectation("'", false),
+          peg$c59 = /^[^\\']/,
+          peg$c60 = peg$classExpectation(["\\", "'"], true, false),
+          peg$c61 = /^[0-9]/,
+          peg$c62 = peg$classExpectation([["0", "9"]], false, false),
+          peg$c63 = function peg$c63(a, b) {
+            // Can use `a.flat().join('')` once supported
+            var leadingDecimals = a ? [].concat.apply([], a).join('') : '';
+            return {
+              type: 'literal',
+              value: parseFloat(leadingDecimals + b.join(''))
+            };
+          },
+          peg$c64 = function peg$c64(i) {
+            return {
+              type: 'literal',
+              value: i
+            };
+          },
+          peg$c65 = "type(",
+          peg$c66 = peg$literalExpectation("type(", false),
+          peg$c67 = /^[^ )]/,
+          peg$c68 = peg$classExpectation([" ", ")"], true, false),
+          peg$c69 = ")",
+          peg$c70 = peg$literalExpectation(")", false),
+          peg$c71 = function peg$c71(t) {
+            return {
+              type: 'type',
+              value: t.join('')
+            };
+          },
+          peg$c72 = /^[imsu]/,
+          peg$c73 = peg$classExpectation(["i", "m", "s", "u"], false, false),
+          peg$c74 = "/",
+          peg$c75 = peg$literalExpectation("/", false),
+          peg$c76 = function peg$c76(pattern, flgs) {
+            return {
+              type: 'regexp',
+              value: new RegExp(pattern.join(''), flgs ? flgs.join('') : '')
+            };
+          },
+          peg$c77 = /^[^\]\\]/,
+          peg$c78 = peg$classExpectation(["]", "\\"], true, false),
+          peg$c79 = function peg$c79(cs) {
+            return '[' + cs.join('') + ']';
+          },
+          peg$c80 = function peg$c80(a) {
+            return '\\' + a;
+          },
+          peg$c81 = /^[^\/\\[]/,
+          peg$c82 = peg$classExpectation(["/", "\\", "["], true, false),
+          peg$c83 = function peg$c83(cs) {
+            return cs.join('');
+          },
+          peg$c84 = function peg$c84(i, is) {
+            return {
+              type: 'field',
+              name: is.reduce(function (memo, p) {
+                return memo + p[0] + p[1];
+              }, i)
+            };
+          },
+          peg$c85 = ":not(",
+          peg$c86 = peg$literalExpectation(":not(", false),
+          peg$c87 = function peg$c87(ss) {
+            return {
+              type: 'not',
+              selectors: ss
+            };
+          },
+          peg$c88 = ":matches(",
+          peg$c89 = peg$literalExpectation(":matches(", false),
+          peg$c90 = function peg$c90(ss) {
+            return {
+              type: 'matches',
+              selectors: ss
+            };
+          },
+          peg$c91 = ":is(",
+          peg$c92 = peg$literalExpectation(":is(", false),
+          peg$c93 = ":has(",
+          peg$c94 = peg$literalExpectation(":has(", false),
+          peg$c95 = function peg$c95(ss) {
+            return {
+              type: 'has',
+              selectors: ss
+            };
+          },
+          peg$c96 = ":first-child",
+          peg$c97 = peg$literalExpectation(":first-child", false),
+          peg$c98 = function peg$c98() {
+            return nth(1);
+          },
+          peg$c99 = ":last-child",
+          peg$c100 = peg$literalExpectation(":last-child", false),
+          peg$c101 = function peg$c101() {
+            return nthLast(1);
+          },
+          peg$c102 = ":nth-child(",
+          peg$c103 = peg$literalExpectation(":nth-child(", false),
+          peg$c104 = function peg$c104(n) {
+            return nth(parseInt(n.join(''), 10));
+          },
+          peg$c105 = ":nth-last-child(",
+          peg$c106 = peg$literalExpectation(":nth-last-child(", false),
+          peg$c107 = function peg$c107(n) {
+            return nthLast(parseInt(n.join(''), 10));
+          },
+          peg$c108 = ":",
+          peg$c109 = peg$literalExpectation(":", false),
+          peg$c110 = function peg$c110(c) {
+            return {
+              type: 'class',
+              name: c
+            };
+          },
+          peg$currPos = 0,
+          peg$posDetailsCache = [{
+            line: 1,
+            column: 1
+          }],
+          peg$maxFailPos = 0,
+          peg$maxFailExpected = [],
+          peg$resultsCache = {},
+          peg$result;
+        if ("startRule" in options) {
+          if (!(options.startRule in peg$startRuleFunctions)) {
+            throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
+          }
+          peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
+        }
+        function peg$literalExpectation(text, ignoreCase) {
+          return {
+            type: "literal",
+            text: text,
+            ignoreCase: ignoreCase
+          };
+        }
+        function peg$classExpectation(parts, inverted, ignoreCase) {
+          return {
+            type: "class",
+            parts: parts,
+            inverted: inverted,
+            ignoreCase: ignoreCase
+          };
+        }
+        function peg$anyExpectation() {
+          return {
+            type: "any"
+          };
+        }
+        function peg$endExpectation() {
+          return {
+            type: "end"
+          };
+        }
+        function peg$computePosDetails(pos) {
+          var details = peg$posDetailsCache[pos],
+            p;
+          if (details) {
+            return details;
+          } else {
+            p = pos - 1;
+            while (!peg$posDetailsCache[p]) {
+              p--;
+            }
+            details = peg$posDetailsCache[p];
+            details = {
+              line: details.line,
+              column: details.column
+            };
+            while (p < pos) {
+              if (input.charCodeAt(p) === 10) {
+                details.line++;
+                details.column = 1;
+              } else {
+                details.column++;
+              }
+              p++;
+            }
+            peg$posDetailsCache[pos] = details;
+            return details;
+          }
+        }
+        function peg$computeLocation(startPos, endPos) {
+          var startPosDetails = peg$computePosDetails(startPos),
+            endPosDetails = peg$computePosDetails(endPos);
+          return {
+            start: {
+              offset: startPos,
+              line: startPosDetails.line,
+              column: startPosDetails.column
+            },
+            end: {
+              offset: endPos,
+              line: endPosDetails.line,
+              column: endPosDetails.column
+            }
+          };
+        }
+        function peg$fail(expected) {
+          if (peg$currPos < peg$maxFailPos) {
+            return;
+          }
+          if (peg$currPos > peg$maxFailPos) {
+            peg$maxFailPos = peg$currPos;
+            peg$maxFailExpected = [];
+          }
+          peg$maxFailExpected.push(expected);
+        }
+        function peg$buildStructuredError(expected, found, location) {
+          return new peg$SyntaxError(peg$SyntaxError.buildMessage(expected, found), expected, found, location);
+        }
+        function peg$parsestart() {
+          var s0, s1, s2, s3;
+          var key = peg$currPos * 36 + 0,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parse_();
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parseselectors();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parse_();
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c0(s2);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            s1 = peg$parse_();
+            if (s1 !== peg$FAILED) {
+              s1 = peg$c1();
+            }
+            s0 = s1;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parse_() {
+          var s0, s1;
+          var key = peg$currPos * 36 + 1,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = [];
+          if (input.charCodeAt(peg$currPos) === 32) {
+            s1 = peg$c2;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c3);
+            }
+          }
+          while (s1 !== peg$FAILED) {
+            s0.push(s1);
+            if (input.charCodeAt(peg$currPos) === 32) {
+              s1 = peg$c2;
+              peg$currPos++;
+            } else {
+              s1 = peg$FAILED;
+              {
+                peg$fail(peg$c3);
+              }
+            }
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseidentifierName() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 2,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = [];
+          if (peg$c4.test(input.charAt(peg$currPos))) {
+            s2 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            {
+              peg$fail(peg$c5);
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            while (s2 !== peg$FAILED) {
+              s1.push(s2);
+              if (peg$c4.test(input.charAt(peg$currPos))) {
+                s2 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s2 = peg$FAILED;
+                {
+                  peg$fail(peg$c5);
+                }
+              }
+            }
+          } else {
+            s1 = peg$FAILED;
+          }
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c6(s1);
+          }
+          s0 = s1;
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsebinaryOp() {
+          var s0, s1, s2, s3;
+          var key = peg$currPos * 36 + 3,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parse_();
+          if (s1 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 62) {
+              s2 = peg$c7;
+              peg$currPos++;
+            } else {
+              s2 = peg$FAILED;
+              {
+                peg$fail(peg$c8);
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parse_();
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c9();
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            s1 = peg$parse_();
+            if (s1 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 126) {
+                s2 = peg$c10;
+                peg$currPos++;
+              } else {
+                s2 = peg$FAILED;
+                {
+                  peg$fail(peg$c11);
+                }
+              }
+              if (s2 !== peg$FAILED) {
+                s3 = peg$parse_();
+                if (s3 !== peg$FAILED) {
+                  s1 = peg$c12();
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+            if (s0 === peg$FAILED) {
+              s0 = peg$currPos;
+              s1 = peg$parse_();
+              if (s1 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 43) {
+                  s2 = peg$c13;
+                  peg$currPos++;
+                } else {
+                  s2 = peg$FAILED;
+                  {
+                    peg$fail(peg$c14);
+                  }
+                }
+                if (s2 !== peg$FAILED) {
+                  s3 = peg$parse_();
+                  if (s3 !== peg$FAILED) {
+                    s1 = peg$c15();
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+              if (s0 === peg$FAILED) {
+                s0 = peg$currPos;
+                if (input.charCodeAt(peg$currPos) === 32) {
+                  s1 = peg$c2;
+                  peg$currPos++;
+                } else {
+                  s1 = peg$FAILED;
+                  {
+                    peg$fail(peg$c3);
+                  }
+                }
+                if (s1 !== peg$FAILED) {
+                  s2 = peg$parse_();
+                  if (s2 !== peg$FAILED) {
+                    s1 = peg$c16();
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              }
+            }
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsehasSelectors() {
+          var s0, s1, s2, s3, s4, s5, s6, s7;
+          var key = peg$currPos * 36 + 4,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parsehasSelector();
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            s3 = peg$currPos;
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 44) {
+                s5 = peg$c17;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                {
+                  peg$fail(peg$c18);
+                }
+              }
+              if (s5 !== peg$FAILED) {
+                s6 = peg$parse_();
+                if (s6 !== peg$FAILED) {
+                  s7 = peg$parsehasSelector();
+                  if (s7 !== peg$FAILED) {
+                    s4 = [s4, s5, s6, s7];
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              s3 = peg$currPos;
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 44) {
+                  s5 = peg$c17;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c18);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s6 = peg$parse_();
+                  if (s6 !== peg$FAILED) {
+                    s7 = peg$parsehasSelector();
+                    if (s7 !== peg$FAILED) {
+                      s4 = [s4, s5, s6, s7];
+                      s3 = s4;
+                    } else {
+                      peg$currPos = s3;
+                      s3 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c19(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseselectors() {
+          var s0, s1, s2, s3, s4, s5, s6, s7;
+          var key = peg$currPos * 36 + 5,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parseselector();
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            s3 = peg$currPos;
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 44) {
+                s5 = peg$c17;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                {
+                  peg$fail(peg$c18);
+                }
+              }
+              if (s5 !== peg$FAILED) {
+                s6 = peg$parse_();
+                if (s6 !== peg$FAILED) {
+                  s7 = peg$parseselector();
+                  if (s7 !== peg$FAILED) {
+                    s4 = [s4, s5, s6, s7];
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              s3 = peg$currPos;
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 44) {
+                  s5 = peg$c17;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c18);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s6 = peg$parse_();
+                  if (s6 !== peg$FAILED) {
+                    s7 = peg$parseselector();
+                    if (s7 !== peg$FAILED) {
+                      s4 = [s4, s5, s6, s7];
+                      s3 = s4;
+                    } else {
+                      peg$currPos = s3;
+                      s3 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c19(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsehasSelector() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 6,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parsebinaryOp();
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parseselector();
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c20(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseselector() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 7,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parsesequence();
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            s3 = peg$currPos;
+            s4 = peg$parsebinaryOp();
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parsesequence();
+              if (s5 !== peg$FAILED) {
+                s4 = [s4, s5];
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              s3 = peg$currPos;
+              s4 = peg$parsebinaryOp();
+              if (s4 !== peg$FAILED) {
+                s5 = peg$parsesequence();
+                if (s5 !== peg$FAILED) {
+                  s4 = [s4, s5];
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c21(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsesequence() {
+          var s0, s1, s2, s3;
+          var key = peg$currPos * 36 + 8,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 33) {
+            s1 = peg$c22;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c23);
+            }
+          }
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            s3 = peg$parseatom();
+            if (s3 !== peg$FAILED) {
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                s3 = peg$parseatom();
+              }
+            } else {
+              s2 = peg$FAILED;
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c24(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseatom() {
+          var s0;
+          var key = peg$currPos * 36 + 9,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$parsewildcard();
+          if (s0 === peg$FAILED) {
+            s0 = peg$parseidentifier();
+            if (s0 === peg$FAILED) {
+              s0 = peg$parseattr();
+              if (s0 === peg$FAILED) {
+                s0 = peg$parsefield();
+                if (s0 === peg$FAILED) {
+                  s0 = peg$parsenegation();
+                  if (s0 === peg$FAILED) {
+                    s0 = peg$parsematches();
+                    if (s0 === peg$FAILED) {
+                      s0 = peg$parseis();
+                      if (s0 === peg$FAILED) {
+                        s0 = peg$parsehas();
+                        if (s0 === peg$FAILED) {
+                          s0 = peg$parsefirstChild();
+                          if (s0 === peg$FAILED) {
+                            s0 = peg$parselastChild();
+                            if (s0 === peg$FAILED) {
+                              s0 = peg$parsenthChild();
+                              if (s0 === peg$FAILED) {
+                                s0 = peg$parsenthLastChild();
+                                if (s0 === peg$FAILED) {
+                                  s0 = peg$parseclass();
+                                }
+                              }
+                            }
+                          }
+                        }
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsewildcard() {
+          var s0, s1;
+          var key = peg$currPos * 36 + 10,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 42) {
+            s1 = peg$c25;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c26);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c27(s1);
+          }
+          s0 = s1;
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseidentifier() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 11,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 35) {
+            s1 = peg$c28;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c29);
+            }
+          }
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parseidentifierName();
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c30(s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseattr() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 12,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 91) {
+            s1 = peg$c31;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c32);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parseattrValue();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 93) {
+                    s5 = peg$c33;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c34);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c35(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseattrOps() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 13,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (peg$c36.test(input.charAt(peg$currPos))) {
+            s1 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c37);
+            }
+          }
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 61) {
+              s2 = peg$c38;
+              peg$currPos++;
+            } else {
+              s2 = peg$FAILED;
+              {
+                peg$fail(peg$c39);
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c40(s1);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            if (peg$c41.test(input.charAt(peg$currPos))) {
+              s0 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s0 = peg$FAILED;
+              {
+                peg$fail(peg$c42);
+              }
+            }
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseattrEqOps() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 14,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 33) {
+            s1 = peg$c22;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c23);
+            }
+          }
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 61) {
+              s2 = peg$c38;
+              peg$currPos++;
+            } else {
+              s2 = peg$FAILED;
+              {
+                peg$fail(peg$c39);
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c40(s1);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseattrName() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 15,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parseidentifierName();
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            s3 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 46) {
+              s4 = peg$c43;
+              peg$currPos++;
+            } else {
+              s4 = peg$FAILED;
+              {
+                peg$fail(peg$c44);
+              }
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseidentifierName();
+              if (s5 !== peg$FAILED) {
+                s4 = [s4, s5];
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              s3 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 46) {
+                s4 = peg$c43;
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                {
+                  peg$fail(peg$c44);
+                }
+              }
+              if (s4 !== peg$FAILED) {
+                s5 = peg$parseidentifierName();
+                if (s5 !== peg$FAILED) {
+                  s4 = [s4, s5];
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c45(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseattrValue() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 16,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parseattrName();
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parseattrEqOps();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  s5 = peg$parsetype();
+                  if (s5 === peg$FAILED) {
+                    s5 = peg$parseregex();
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c46(s1, s3, s5);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            s1 = peg$parseattrName();
+            if (s1 !== peg$FAILED) {
+              s2 = peg$parse_();
+              if (s2 !== peg$FAILED) {
+                s3 = peg$parseattrOps();
+                if (s3 !== peg$FAILED) {
+                  s4 = peg$parse_();
+                  if (s4 !== peg$FAILED) {
+                    s5 = peg$parsestring();
+                    if (s5 === peg$FAILED) {
+                      s5 = peg$parsenumber();
+                      if (s5 === peg$FAILED) {
+                        s5 = peg$parsepath();
+                      }
+                    }
+                    if (s5 !== peg$FAILED) {
+                      s1 = peg$c46(s1, s3, s5);
+                      s0 = s1;
+                    } else {
+                      peg$currPos = s0;
+                      s0 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+            if (s0 === peg$FAILED) {
+              s0 = peg$currPos;
+              s1 = peg$parseattrName();
+              if (s1 !== peg$FAILED) {
+                s1 = peg$c47(s1);
+              }
+              s0 = s1;
+            }
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsestring() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 17,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 34) {
+            s1 = peg$c48;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c49);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            if (peg$c50.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c51);
+              }
+            }
+            if (s3 === peg$FAILED) {
+              s3 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 92) {
+                s4 = peg$c52;
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                {
+                  peg$fail(peg$c53);
+                }
+              }
+              if (s4 !== peg$FAILED) {
+                if (input.length > peg$currPos) {
+                  s5 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c54);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s4 = peg$c55(s4, s5);
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              if (peg$c50.test(input.charAt(peg$currPos))) {
+                s3 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c51);
+                }
+              }
+              if (s3 === peg$FAILED) {
+                s3 = peg$currPos;
+                if (input.charCodeAt(peg$currPos) === 92) {
+                  s4 = peg$c52;
+                  peg$currPos++;
+                } else {
+                  s4 = peg$FAILED;
+                  {
+                    peg$fail(peg$c53);
+                  }
+                }
+                if (s4 !== peg$FAILED) {
+                  if (input.length > peg$currPos) {
+                    s5 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c54);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s4 = peg$c55(s4, s5);
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 34) {
+                s3 = peg$c48;
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c49);
+                }
+              }
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c56(s2);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 39) {
+              s1 = peg$c57;
+              peg$currPos++;
+            } else {
+              s1 = peg$FAILED;
+              {
+                peg$fail(peg$c58);
+              }
+            }
+            if (s1 !== peg$FAILED) {
+              s2 = [];
+              if (peg$c59.test(input.charAt(peg$currPos))) {
+                s3 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c60);
+                }
+              }
+              if (s3 === peg$FAILED) {
+                s3 = peg$currPos;
+                if (input.charCodeAt(peg$currPos) === 92) {
+                  s4 = peg$c52;
+                  peg$currPos++;
+                } else {
+                  s4 = peg$FAILED;
+                  {
+                    peg$fail(peg$c53);
+                  }
+                }
+                if (s4 !== peg$FAILED) {
+                  if (input.length > peg$currPos) {
+                    s5 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c54);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s4 = peg$c55(s4, s5);
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              }
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                if (peg$c59.test(input.charAt(peg$currPos))) {
+                  s3 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s3 = peg$FAILED;
+                  {
+                    peg$fail(peg$c60);
+                  }
+                }
+                if (s3 === peg$FAILED) {
+                  s3 = peg$currPos;
+                  if (input.charCodeAt(peg$currPos) === 92) {
+                    s4 = peg$c52;
+                    peg$currPos++;
+                  } else {
+                    s4 = peg$FAILED;
+                    {
+                      peg$fail(peg$c53);
+                    }
+                  }
+                  if (s4 !== peg$FAILED) {
+                    if (input.length > peg$currPos) {
+                      s5 = input.charAt(peg$currPos);
+                      peg$currPos++;
+                    } else {
+                      s5 = peg$FAILED;
+                      {
+                        peg$fail(peg$c54);
+                      }
+                    }
+                    if (s5 !== peg$FAILED) {
+                      s4 = peg$c55(s4, s5);
+                      s3 = s4;
+                    } else {
+                      peg$currPos = s3;
+                      s3 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                }
+              }
+              if (s2 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 39) {
+                  s3 = peg$c57;
+                  peg$currPos++;
+                } else {
+                  s3 = peg$FAILED;
+                  {
+                    peg$fail(peg$c58);
+                  }
+                }
+                if (s3 !== peg$FAILED) {
+                  s1 = peg$c56(s2);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsenumber() {
+          var s0, s1, s2, s3;
+          var key = peg$currPos * 36 + 18,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$currPos;
+          s2 = [];
+          if (peg$c61.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            {
+              peg$fail(peg$c62);
+            }
+          }
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            if (peg$c61.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c62);
+              }
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 46) {
+              s3 = peg$c43;
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c44);
+              }
+            }
+            if (s3 !== peg$FAILED) {
+              s2 = [s2, s3];
+              s1 = s2;
+            } else {
+              peg$currPos = s1;
+              s1 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s1;
+            s1 = peg$FAILED;
+          }
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            if (peg$c61.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c62);
+              }
+            }
+            if (s3 !== peg$FAILED) {
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                if (peg$c61.test(input.charAt(peg$currPos))) {
+                  s3 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s3 = peg$FAILED;
+                  {
+                    peg$fail(peg$c62);
+                  }
+                }
+              }
+            } else {
+              s2 = peg$FAILED;
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c63(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsepath() {
+          var s0, s1;
+          var key = peg$currPos * 36 + 19,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parseidentifierName();
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c64(s1);
+          }
+          s0 = s1;
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsetype() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 20,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 5) === peg$c65) {
+            s1 = peg$c65;
+            peg$currPos += 5;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c66);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = [];
+              if (peg$c67.test(input.charAt(peg$currPos))) {
+                s4 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                {
+                  peg$fail(peg$c68);
+                }
+              }
+              if (s4 !== peg$FAILED) {
+                while (s4 !== peg$FAILED) {
+                  s3.push(s4);
+                  if (peg$c67.test(input.charAt(peg$currPos))) {
+                    s4 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s4 = peg$FAILED;
+                    {
+                      peg$fail(peg$c68);
+                    }
+                  }
+                }
+              } else {
+                s3 = peg$FAILED;
+              }
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c71(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseflags() {
+          var s0, s1;
+          var key = peg$currPos * 36 + 21,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = [];
+          if (peg$c72.test(input.charAt(peg$currPos))) {
+            s1 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c73);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            while (s1 !== peg$FAILED) {
+              s0.push(s1);
+              if (peg$c72.test(input.charAt(peg$currPos))) {
+                s1 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s1 = peg$FAILED;
+                {
+                  peg$fail(peg$c73);
+                }
+              }
+            }
+          } else {
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseregex() {
+          var s0, s1, s2, s3, s4;
+          var key = peg$currPos * 36 + 22,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 47) {
+            s1 = peg$c74;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c75);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            s3 = peg$parsere_character_class();
+            if (s3 === peg$FAILED) {
+              s3 = peg$parsere_escape();
+              if (s3 === peg$FAILED) {
+                s3 = peg$parsere_chars();
+              }
+            }
+            if (s3 !== peg$FAILED) {
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                s3 = peg$parsere_character_class();
+                if (s3 === peg$FAILED) {
+                  s3 = peg$parsere_escape();
+                  if (s3 === peg$FAILED) {
+                    s3 = peg$parsere_chars();
+                  }
+                }
+              }
+            } else {
+              s2 = peg$FAILED;
+            }
+            if (s2 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 47) {
+                s3 = peg$c74;
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c75);
+                }
+              }
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parseflags();
+                if (s4 === peg$FAILED) {
+                  s4 = null;
+                }
+                if (s4 !== peg$FAILED) {
+                  s1 = peg$c76(s2, s4);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsere_character_class() {
+          var s0, s1, s2, s3;
+          var key = peg$currPos * 36 + 23,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 91) {
+            s1 = peg$c31;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c32);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            if (peg$c77.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c78);
+              }
+            }
+            if (s3 === peg$FAILED) {
+              s3 = peg$parsere_escape();
+            }
+            if (s3 !== peg$FAILED) {
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                if (peg$c77.test(input.charAt(peg$currPos))) {
+                  s3 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s3 = peg$FAILED;
+                  {
+                    peg$fail(peg$c78);
+                  }
+                }
+                if (s3 === peg$FAILED) {
+                  s3 = peg$parsere_escape();
+                }
+              }
+            } else {
+              s2 = peg$FAILED;
+            }
+            if (s2 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 93) {
+                s3 = peg$c33;
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c34);
+                }
+              }
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c79(s2);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsere_escape() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 24,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 92) {
+            s1 = peg$c52;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c53);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            if (input.length > peg$currPos) {
+              s2 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s2 = peg$FAILED;
+              {
+                peg$fail(peg$c54);
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c80(s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsere_chars() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 25,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = [];
+          if (peg$c81.test(input.charAt(peg$currPos))) {
+            s2 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            {
+              peg$fail(peg$c82);
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            while (s2 !== peg$FAILED) {
+              s1.push(s2);
+              if (peg$c81.test(input.charAt(peg$currPos))) {
+                s2 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s2 = peg$FAILED;
+                {
+                  peg$fail(peg$c82);
+                }
+              }
+            }
+          } else {
+            s1 = peg$FAILED;
+          }
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c83(s1);
+          }
+          s0 = s1;
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsefield() {
+          var s0, s1, s2, s3, s4, s5, s6;
+          var key = peg$currPos * 36 + 26,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 46) {
+            s1 = peg$c43;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c44);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parseidentifierName();
+            if (s2 !== peg$FAILED) {
+              s3 = [];
+              s4 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 46) {
+                s5 = peg$c43;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                {
+                  peg$fail(peg$c44);
+                }
+              }
+              if (s5 !== peg$FAILED) {
+                s6 = peg$parseidentifierName();
+                if (s6 !== peg$FAILED) {
+                  s5 = [s5, s6];
+                  s4 = s5;
+                } else {
+                  peg$currPos = s4;
+                  s4 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s4;
+                s4 = peg$FAILED;
+              }
+              while (s4 !== peg$FAILED) {
+                s3.push(s4);
+                s4 = peg$currPos;
+                if (input.charCodeAt(peg$currPos) === 46) {
+                  s5 = peg$c43;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c44);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s6 = peg$parseidentifierName();
+                  if (s6 !== peg$FAILED) {
+                    s5 = [s5, s6];
+                    s4 = s5;
+                  } else {
+                    peg$currPos = s4;
+                    s4 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s4;
+                  s4 = peg$FAILED;
+                }
+              }
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c84(s2, s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsenegation() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 27,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 5) === peg$c85) {
+            s1 = peg$c85;
+            peg$currPos += 5;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c86);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parseselectors();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c87(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsematches() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 28,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 9) === peg$c88) {
+            s1 = peg$c88;
+            peg$currPos += 9;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c89);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parseselectors();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c90(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseis() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 29,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 4) === peg$c91) {
+            s1 = peg$c91;
+            peg$currPos += 4;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c92);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parseselectors();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c90(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsehas() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 30,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 5) === peg$c93) {
+            s1 = peg$c93;
+            peg$currPos += 5;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c94);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parsehasSelectors();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c95(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsefirstChild() {
+          var s0, s1;
+          var key = peg$currPos * 36 + 31,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 12) === peg$c96) {
+            s1 = peg$c96;
+            peg$currPos += 12;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c97);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c98();
+          }
+          s0 = s1;
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parselastChild() {
+          var s0, s1;
+          var key = peg$currPos * 36 + 32,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 11) === peg$c99) {
+            s1 = peg$c99;
+            peg$currPos += 11;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c100);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c101();
+          }
+          s0 = s1;
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsenthChild() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 33,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 11) === peg$c102) {
+            s1 = peg$c102;
+            peg$currPos += 11;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c103);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = [];
+              if (peg$c61.test(input.charAt(peg$currPos))) {
+                s4 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                {
+                  peg$fail(peg$c62);
+                }
+              }
+              if (s4 !== peg$FAILED) {
+                while (s4 !== peg$FAILED) {
+                  s3.push(s4);
+                  if (peg$c61.test(input.charAt(peg$currPos))) {
+                    s4 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s4 = peg$FAILED;
+                    {
+                      peg$fail(peg$c62);
+                    }
+                  }
+                }
+              } else {
+                s3 = peg$FAILED;
+              }
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c104(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsenthLastChild() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 34,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 16) === peg$c105) {
+            s1 = peg$c105;
+            peg$currPos += 16;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c106);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = [];
+              if (peg$c61.test(input.charAt(peg$currPos))) {
+                s4 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                {
+                  peg$fail(peg$c62);
+                }
+              }
+              if (s4 !== peg$FAILED) {
+                while (s4 !== peg$FAILED) {
+                  s3.push(s4);
+                  if (peg$c61.test(input.charAt(peg$currPos))) {
+                    s4 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s4 = peg$FAILED;
+                    {
+                      peg$fail(peg$c62);
+                    }
+                  }
+                }
+              } else {
+                s3 = peg$FAILED;
+              }
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c107(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseclass() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 35,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 58) {
+            s1 = peg$c108;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c109);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parseidentifierName();
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c110(s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function nth(n) {
+          return {
+            type: 'nth-child',
+            index: {
+              type: 'literal',
+              value: n
+            }
+          };
+        }
+        function nthLast(n) {
+          return {
+            type: 'nth-last-child',
+            index: {
+              type: 'literal',
+              value: n
+            }
+          };
+        }
+        function strUnescape(s) {
+          return s.replace(/\\(.)/g, function (match, ch) {
+            switch (ch) {
+              case 'b':
+                return '\b';
+              case 'f':
+                return '\f';
+              case 'n':
+                return '\n';
+              case 'r':
+                return '\r';
+              case 't':
+                return '\t';
+              case 'v':
+                return '\v';
+              default:
+                return ch;
+            }
+          });
+        }
+        peg$result = peg$startRuleFunction();
+        if (peg$result !== peg$FAILED && peg$currPos === input.length) {
+          return peg$result;
+        } else {
+          if (peg$result !== peg$FAILED && peg$currPos < input.length) {
+            peg$fail(peg$endExpectation());
+          }
+          throw peg$buildStructuredError(peg$maxFailExpected, peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null, peg$maxFailPos < input.length ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1) : peg$computeLocation(peg$maxFailPos, peg$maxFailPos));
+        }
+      }
+      return {
+        SyntaxError: peg$SyntaxError,
+        parse: peg$parse
+      };
+    });
+  });
+
+  /**
+  * @typedef {"LEFT_SIDE"|"RIGHT_SIDE"} Side
+  */
+
+  var LEFT_SIDE = 'LEFT_SIDE';
+  var RIGHT_SIDE = 'RIGHT_SIDE';
+
+  /**
+   * @external AST
+   * @see https://esprima.readthedocs.io/en/latest/syntax-tree-format.html
+   */
+
+  /**
+   * One of the rules of `grammar.pegjs`
+   * @typedef {PlainObject} SelectorAST
+   * @see grammar.pegjs
+  */
+
+  /**
+   * The `sequence` production of `grammar.pegjs`
+   * @typedef {PlainObject} SelectorSequenceAST
+  */
+
+  /**
+   * Get the value of a property which may be multiple levels down
+   * in the object.
+   * @param {?PlainObject} obj
+   * @param {string[]} keys
+   * @returns {undefined|boolean|string|number|external:AST}
+   */
+  function getPath(obj, keys) {
+    for (var i = 0; i < keys.length; ++i) {
+      if (obj == null) {
+        return obj;
+      }
+      obj = obj[keys[i]];
+    }
+    return obj;
+  }
+
+  /**
+   * Determine whether `node` can be reached by following `path`,
+   * starting at `ancestor`.
+   * @param {?external:AST} node
+   * @param {?external:AST} ancestor
+   * @param {string[]} path
+   * @param {Integer} fromPathIndex
+   * @returns {boolean}
+   */
+  function inPath(node, ancestor, path, fromPathIndex) {
+    var current = ancestor;
+    for (var i = fromPathIndex; i < path.length; ++i) {
+      if (current == null) {
+        return false;
+      }
+      var field = current[path[i]];
+      if (Array.isArray(field)) {
+        for (var k = 0; k < field.length; ++k) {
+          if (inPath(node, field[k], path, i + 1)) {
+            return true;
+          }
+        }
+        return false;
+      }
+      current = field;
+    }
+    return node === current;
+  }
+
+  /**
+   * A generated matcher function for a selector.
+   * @callback SelectorMatcher
+   * @param {?SelectorAST} selector
+   * @param {external:AST[]} [ancestry=[]]
+   * @param {ESQueryOptions} [options]
+   * @returns {void}
+  */
+
+  /**
+   * A WeakMap for holding cached matcher functions for selectors.
+   * @type {WeakMap<SelectorAST, SelectorMatcher>}
+  */
+  var MATCHER_CACHE = typeof WeakMap === 'function' ? new WeakMap() : null;
+
+  /**
+   * Look up a matcher function for `selector` in the cache.
+   * If it does not exist, generate it with `generateMatcher` and add it to the cache.
+   * In engines without WeakMap, the caching is skipped and matchers are generated with every call.
+   * @param {?SelectorAST} selector
+   * @returns {SelectorMatcher}
+   */
+  function getMatcher(selector) {
+    if (selector == null) {
+      return function () {
+        return true;
+      };
+    }
+    if (MATCHER_CACHE != null) {
+      var matcher = MATCHER_CACHE.get(selector);
+      if (matcher != null) {
+        return matcher;
+      }
+      matcher = generateMatcher(selector);
+      MATCHER_CACHE.set(selector, matcher);
+      return matcher;
+    }
+    return generateMatcher(selector);
+  }
+
+  /**
+   * Create a matcher function for `selector`,
+   * @param {?SelectorAST} selector
+   * @returns {SelectorMatcher}
+   */
+  function generateMatcher(selector) {
+    switch (selector.type) {
+      case 'wildcard':
+        return function () {
+          return true;
+        };
+      case 'identifier':
+        {
+          var value = selector.value.toLowerCase();
+          return function (node, ancestry, options) {
+            var nodeTypeKey = options && options.nodeTypeKey || 'type';
+            return value === node[nodeTypeKey].toLowerCase();
+          };
+        }
+      case 'exactNode':
+        return function (node, ancestry) {
+          return ancestry.length === 0;
+        };
+      case 'field':
+        {
+          var path = selector.name.split('.');
+          return function (node, ancestry) {
+            var ancestor = ancestry[path.length - 1];
+            return inPath(node, ancestor, path, 0);
+          };
+        }
+      case 'matches':
+        {
+          var matchers = selector.selectors.map(getMatcher);
+          return function (node, ancestry, options) {
+            for (var i = 0; i < matchers.length; ++i) {
+              if (matchers[i](node, ancestry, options)) {
+                return true;
+              }
+            }
+            return false;
+          };
+        }
+      case 'compound':
+        {
+          var _matchers = selector.selectors.map(getMatcher);
+          return function (node, ancestry, options) {
+            for (var i = 0; i < _matchers.length; ++i) {
+              if (!_matchers[i](node, ancestry, options)) {
+                return false;
+              }
+            }
+            return true;
+          };
+        }
+      case 'not':
+        {
+          var _matchers2 = selector.selectors.map(getMatcher);
+          return function (node, ancestry, options) {
+            for (var i = 0; i < _matchers2.length; ++i) {
+              if (_matchers2[i](node, ancestry, options)) {
+                return false;
+              }
+            }
+            return true;
+          };
+        }
+      case 'has':
+        {
+          var _matchers3 = selector.selectors.map(getMatcher);
+          return function (node, ancestry, options) {
+            var result = false;
+            var a = [];
+            estraverse.traverse(node, {
+              enter: function enter(node, parent) {
+                if (parent != null) {
+                  a.unshift(parent);
+                }
+                for (var i = 0; i < _matchers3.length; ++i) {
+                  if (_matchers3[i](node, a, options)) {
+                    result = true;
+                    this["break"]();
+                    return;
+                  }
+                }
+              },
+              leave: function leave() {
+                a.shift();
+              },
+              keys: options && options.visitorKeys,
+              fallback: options && options.fallback || 'iteration'
+            });
+            return result;
+          };
+        }
+      case 'child':
+        {
+          var left = getMatcher(selector.left);
+          var right = getMatcher(selector.right);
+          return function (node, ancestry, options) {
+            if (ancestry.length > 0 && right(node, ancestry, options)) {
+              return left(ancestry[0], ancestry.slice(1), options);
+            }
+            return false;
+          };
+        }
+      case 'descendant':
+        {
+          var _left = getMatcher(selector.left);
+          var _right = getMatcher(selector.right);
+          return function (node, ancestry, options) {
+            if (_right(node, ancestry, options)) {
+              for (var i = 0, l = ancestry.length; i < l; ++i) {
+                if (_left(ancestry[i], ancestry.slice(i + 1), options)) {
+                  return true;
+                }
+              }
+            }
+            return false;
+          };
+        }
+      case 'attribute':
+        {
+          var _path = selector.name.split('.');
+          switch (selector.operator) {
+            case void 0:
+              return function (node) {
+                return getPath(node, _path) != null;
+              };
+            case '=':
+              switch (selector.value.type) {
+                case 'regexp':
+                  return function (node) {
+                    var p = getPath(node, _path);
+                    return typeof p === 'string' && selector.value.value.test(p);
+                  };
+                case 'literal':
+                  {
+                    var literal = "".concat(selector.value.value);
+                    return function (node) {
+                      return literal === "".concat(getPath(node, _path));
+                    };
+                  }
+                case 'type':
+                  return function (node) {
+                    return selector.value.value === _typeof(getPath(node, _path));
+                  };
+              }
+              throw new Error("Unknown selector value type: ".concat(selector.value.type));
+            case '!=':
+              switch (selector.value.type) {
+                case 'regexp':
+                  return function (node) {
+                    return !selector.value.value.test(getPath(node, _path));
+                  };
+                case 'literal':
+                  {
+                    var _literal = "".concat(selector.value.value);
+                    return function (node) {
+                      return _literal !== "".concat(getPath(node, _path));
+                    };
+                  }
+                case 'type':
+                  return function (node) {
+                    return selector.value.value !== _typeof(getPath(node, _path));
+                  };
+              }
+              throw new Error("Unknown selector value type: ".concat(selector.value.type));
+            case '<=':
+              return function (node) {
+                return getPath(node, _path) <= selector.value.value;
+              };
+            case '<':
+              return function (node) {
+                return getPath(node, _path) < selector.value.value;
+              };
+            case '>':
+              return function (node) {
+                return getPath(node, _path) > selector.value.value;
+              };
+            case '>=':
+              return function (node) {
+                return getPath(node, _path) >= selector.value.value;
+              };
+          }
+          throw new Error("Unknown operator: ".concat(selector.operator));
+        }
+      case 'sibling':
+        {
+          var _left2 = getMatcher(selector.left);
+          var _right2 = getMatcher(selector.right);
+          return function (node, ancestry, options) {
+            return _right2(node, ancestry, options) && sibling(node, _left2, ancestry, LEFT_SIDE, options) || selector.left.subject && _left2(node, ancestry, options) && sibling(node, _right2, ancestry, RIGHT_SIDE, options);
+          };
+        }
+      case 'adjacent':
+        {
+          var _left3 = getMatcher(selector.left);
+          var _right3 = getMatcher(selector.right);
+          return function (node, ancestry, options) {
+            return _right3(node, ancestry, options) && adjacent(node, _left3, ancestry, LEFT_SIDE, options) || selector.right.subject && _left3(node, ancestry, options) && adjacent(node, _right3, ancestry, RIGHT_SIDE, options);
+          };
+        }
+      case 'nth-child':
+        {
+          var nth = selector.index.value;
+          var _right4 = getMatcher(selector.right);
+          return function (node, ancestry, options) {
+            return _right4(node, ancestry, options) && nthChild(node, ancestry, nth, options);
+          };
+        }
+      case 'nth-last-child':
+        {
+          var _nth = -selector.index.value;
+          var _right5 = getMatcher(selector.right);
+          return function (node, ancestry, options) {
+            return _right5(node, ancestry, options) && nthChild(node, ancestry, _nth, options);
+          };
+        }
+      case 'class':
+        {
+          var name = selector.name.toLowerCase();
+          return function (node, ancestry, options) {
+            if (options && options.matchClass) {
+              return options.matchClass(selector.name, node, ancestry);
+            }
+            if (options && options.nodeTypeKey) return false;
+            switch (name) {
+              case 'statement':
+                if (node.type.slice(-9) === 'Statement') return true;
+              // fallthrough: interface Declaration <: Statement { }
+              case 'declaration':
+                return node.type.slice(-11) === 'Declaration';
+              case 'pattern':
+                if (node.type.slice(-7) === 'Pattern') return true;
+              // fallthrough: interface Expression <: Node, Pattern { }
+              case 'expression':
+                return node.type.slice(-10) === 'Expression' || node.type.slice(-7) === 'Literal' || node.type === 'Identifier' && (ancestry.length === 0 || ancestry[0].type !== 'MetaProperty') || node.type === 'MetaProperty';
+              case 'function':
+                return node.type === 'FunctionDeclaration' || node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression';
+            }
+            throw new Error("Unknown class name: ".concat(selector.name));
+          };
+        }
+    }
+    throw new Error("Unknown selector type: ".concat(selector.type));
+  }
+
+  /**
+   * @callback TraverseOptionFallback
+   * @param {external:AST} node The given node.
+   * @returns {string[]} An array of visitor keys for the given node.
+   */
+
+  /**
+   * @callback ClassMatcher
+   * @param {string} className The name of the class to match.
+   * @param {external:AST} node The node to match against.
+   * @param {Array<external:AST>} ancestry The ancestry of the node.
+   * @returns {boolean} True if the node matches the class, false if not.
+   */
+
+  /**
+   * @typedef {object} ESQueryOptions
+   * @property {string} [nodeTypeKey="type"] By passing `nodeTypeKey`, we can allow other ASTs to use ESQuery.
+   * @property { { [nodeType: string]: string[] } } [visitorKeys] By passing `visitorKeys` mapping, we can extend the properties of the nodes that traverse the node.
+   * @property {TraverseOptionFallback} [fallback] By passing `fallback` option, we can control the properties of traversing nodes when encountering unknown nodes.
+   * @property {ClassMatcher} [matchClass] By passing `matchClass` option, we can customize the interpretation of classes.
+   */
+
+  /**
+   * Given a `node` and its ancestors, determine if `node` is matched
+   * by `selector`.
+   * @param {?external:AST} node
+   * @param {?SelectorAST} selector
+   * @param {external:AST[]} [ancestry=[]]
+   * @param {ESQueryOptions} [options]
+   * @throws {Error} Unknowns (operator, class name, selector type, or
+   * selector value type)
+   * @returns {boolean}
+   */
+  function matches(node, selector, ancestry, options) {
+    if (!selector) {
+      return true;
+    }
+    if (!node) {
+      return false;
+    }
+    if (!ancestry) {
+      ancestry = [];
+    }
+    return getMatcher(selector)(node, ancestry, options);
+  }
+
+  /**
+   * Get visitor keys of a given node.
+   * @param {external:AST} node The AST node to get keys.
+   * @param {ESQueryOptions|undefined} options
+   * @returns {string[]} Visitor keys of the node.
+   */
+  function getVisitorKeys(node, options) {
+    var nodeTypeKey = options && options.nodeTypeKey || 'type';
+    var nodeType = node[nodeTypeKey];
+    if (options && options.visitorKeys && options.visitorKeys[nodeType]) {
+      return options.visitorKeys[nodeType];
+    }
+    if (estraverse.VisitorKeys[nodeType]) {
+      return estraverse.VisitorKeys[nodeType];
+    }
+    if (options && typeof options.fallback === 'function') {
+      return options.fallback(node);
+    }
+    // 'iteration' fallback
+    return Object.keys(node).filter(function (key) {
+      return key !== nodeTypeKey;
+    });
+  }
+
+  /**
+   * Check whether the given value is an ASTNode or not.
+   * @param {any} node The value to check.
+   * @param {ESQueryOptions|undefined} options The options to use.
+   * @returns {boolean} `true` if the value is an ASTNode.
+   */
+  function isNode(node, options) {
+    var nodeTypeKey = options && options.nodeTypeKey || 'type';
+    return node !== null && _typeof(node) === 'object' && typeof node[nodeTypeKey] === 'string';
+  }
+
+  /**
+   * Determines if the given node has a sibling that matches the
+   * given selector matcher.
+   * @param {external:AST} node
+   * @param {SelectorMatcher} matcher
+   * @param {external:AST[]} ancestry
+   * @param {Side} side
+   * @param {ESQueryOptions|undefined} options
+   * @returns {boolean}
+   */
+  function sibling(node, matcher, ancestry, side, options) {
+    var _ancestry = _slicedToArray(ancestry, 1),
+      parent = _ancestry[0];
+    if (!parent) {
+      return false;
+    }
+    var keys = getVisitorKeys(parent, options);
+    for (var i = 0; i < keys.length; ++i) {
+      var listProp = parent[keys[i]];
+      if (Array.isArray(listProp)) {
+        var startIndex = listProp.indexOf(node);
+        if (startIndex < 0) {
+          continue;
+        }
+        var lowerBound = void 0,
+          upperBound = void 0;
+        if (side === LEFT_SIDE) {
+          lowerBound = 0;
+          upperBound = startIndex;
+        } else {
+          lowerBound = startIndex + 1;
+          upperBound = listProp.length;
+        }
+        for (var k = lowerBound; k < upperBound; ++k) {
+          if (isNode(listProp[k], options) && matcher(listProp[k], ancestry, options)) {
+            return true;
+          }
+        }
+      }
+    }
+    return false;
+  }
+
+  /**
+   * Determines if the given node has an adjacent sibling that matches
+   * the given selector matcher.
+   * @param {external:AST} node
+   * @param {SelectorMatcher} matcher
+   * @param {external:AST[]} ancestry
+   * @param {Side} side
+   * @param {ESQueryOptions|undefined} options
+   * @returns {boolean}
+   */
+  function adjacent(node, matcher, ancestry, side, options) {
+    var _ancestry2 = _slicedToArray(ancestry, 1),
+      parent = _ancestry2[0];
+    if (!parent) {
+      return false;
+    }
+    var keys = getVisitorKeys(parent, options);
+    for (var i = 0; i < keys.length; ++i) {
+      var listProp = parent[keys[i]];
+      if (Array.isArray(listProp)) {
+        var idx = listProp.indexOf(node);
+        if (idx < 0) {
+          continue;
+        }
+        if (side === LEFT_SIDE && idx > 0 && isNode(listProp[idx - 1], options) && matcher(listProp[idx - 1], ancestry, options)) {
+          return true;
+        }
+        if (side === RIGHT_SIDE && idx < listProp.length - 1 && isNode(listProp[idx + 1], options) && matcher(listProp[idx + 1], ancestry, options)) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
+  /**
+   * Determines if the given node is the `nth` child.
+   * If `nth` is negative then the position is counted
+   * from the end of the list of children.
+   * @param {external:AST} node
+   * @param {external:AST[]} ancestry
+   * @param {Integer} nth
+   * @param {ESQueryOptions|undefined} options
+   * @returns {boolean}
+   */
+  function nthChild(node, ancestry, nth, options) {
+    if (nth === 0) {
+      return false;
+    }
+    var _ancestry3 = _slicedToArray(ancestry, 1),
+      parent = _ancestry3[0];
+    if (!parent) {
+      return false;
+    }
+    var keys = getVisitorKeys(parent, options);
+    for (var i = 0; i < keys.length; ++i) {
+      var listProp = parent[keys[i]];
+      if (Array.isArray(listProp)) {
+        var idx = nth < 0 ? listProp.length + nth : nth - 1;
+        if (idx >= 0 && idx < listProp.length && listProp[idx] === node) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
+  /**
+   * For each selector node marked as a subject, find the portion of the
+   * selector that the subject must match.
+   * @param {SelectorAST} selector
+   * @param {SelectorAST} [ancestor] Defaults to `selector`
+   * @returns {SelectorAST[]}
+   */
+  function subjects(selector, ancestor) {
+    if (selector == null || _typeof(selector) != 'object') {
+      return [];
+    }
+    if (ancestor == null) {
+      ancestor = selector;
+    }
+    var results = selector.subject ? [ancestor] : [];
+    var keys = Object.keys(selector);
+    for (var i = 0; i < keys.length; ++i) {
+      var p = keys[i];
+      var sel = selector[p];
+      results.push.apply(results, _toConsumableArray(subjects(sel, p === 'left' ? sel : ancestor)));
+    }
+    return results;
+  }
+
+  /**
+  * @callback TraverseVisitor
+  * @param {?external:AST} node
+  * @param {?external:AST} parent
+  * @param {external:AST[]} ancestry
+  */
+
+  /**
+   * From a JS AST and a selector AST, collect all JS AST nodes that
+   * match the selector.
+   * @param {external:AST} ast
+   * @param {?SelectorAST} selector
+   * @param {TraverseVisitor} visitor
+   * @param {ESQueryOptions} [options]
+   * @returns {external:AST[]}
+   */
+  function traverse(ast, selector, visitor, options) {
+    if (!selector) {
+      return;
+    }
+    var ancestry = [];
+    var matcher = getMatcher(selector);
+    var altSubjects = subjects(selector).map(getMatcher);
+    estraverse.traverse(ast, {
+      enter: function enter(node, parent) {
+        if (parent != null) {
+          ancestry.unshift(parent);
+        }
+        if (matcher(node, ancestry, options)) {
+          if (altSubjects.length) {
+            for (var i = 0, l = altSubjects.length; i < l; ++i) {
+              if (altSubjects[i](node, ancestry, options)) {
+                visitor(node, parent, ancestry);
+              }
+              for (var k = 0, m = ancestry.length; k < m; ++k) {
+                var succeedingAncestry = ancestry.slice(k + 1);
+                if (altSubjects[i](ancestry[k], succeedingAncestry, options)) {
+                  visitor(ancestry[k], parent, succeedingAncestry);
+                }
+              }
+            }
+          } else {
+            visitor(node, parent, ancestry);
+          }
+        }
+      },
+      leave: function leave() {
+        ancestry.shift();
+      },
+      keys: options && options.visitorKeys,
+      fallback: options && options.fallback || 'iteration'
+    });
+  }
+
+  /**
+   * From a JS AST and a selector AST, collect all JS AST nodes that
+   * match the selector.
+   * @param {external:AST} ast
+   * @param {?SelectorAST} selector
+   * @param {ESQueryOptions} [options]
+   * @returns {external:AST[]}
+   */
+  function match(ast, selector, options) {
+    var results = [];
+    traverse(ast, selector, function (node) {
+      results.push(node);
+    }, options);
+    return results;
+  }
+
+  /**
+   * Parse a selector string and return its AST.
+   * @param {string} selector
+   * @returns {SelectorAST}
+   */
+  function parse(selector) {
+    return parser.parse(selector);
+  }
+
+  /**
+   * Query the code AST using the selector string.
+   * @param {external:AST} ast
+   * @param {string} selector
+   * @param {ESQueryOptions} [options]
+   * @returns {external:AST[]}
+   */
+  function query(ast, selector, options) {
+    return match(ast, parse(selector), options);
+  }
+  query.parse = parse;
+  query.match = match;
+  query.traverse = traverse;
+  query.matches = matches;
+  query.query = query;
+
+  return query;
+
+})));
Index: frontend/node_modules/esquery/dist/esquery.lite.js
===================================================================
--- frontend/node_modules/esquery/dist/esquery.lite.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/dist/esquery.lite.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,3716 @@
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('estraverse')) :
+  typeof define === 'function' && define.amd ? define(['estraverse'], factory) :
+  (global = global || self, global.esquery = factory(global.estraverse));
+}(this, (function (estraverse) { 'use strict';
+
+  estraverse = estraverse && Object.prototype.hasOwnProperty.call(estraverse, 'default') ? estraverse['default'] : estraverse;
+
+  function _arrayLikeToArray(r, a) {
+    (null == a || a > r.length) && (a = r.length);
+    for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e];
+    return n;
+  }
+  function _arrayWithHoles(r) {
+    if (Array.isArray(r)) return r;
+  }
+  function _arrayWithoutHoles(r) {
+    if (Array.isArray(r)) return _arrayLikeToArray(r);
+  }
+  function _iterableToArray(r) {
+    if ("undefined" != typeof Symbol && null != r[Symbol.iterator] || null != r["@@iterator"]) return Array.from(r);
+  }
+  function _iterableToArrayLimit(r, l) {
+    var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"];
+    if (null != t) {
+      var e,
+        n,
+        i,
+        u,
+        a = [],
+        f = !0,
+        o = !1;
+      try {
+        if (i = (t = t.call(r)).next, 0 === l) {
+          if (Object(t) !== t) return;
+          f = !1;
+        } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0);
+      } catch (r) {
+        o = !0, n = r;
+      } finally {
+        try {
+          if (!f && null != t.return && (u = t.return(), Object(u) !== u)) return;
+        } finally {
+          if (o) throw n;
+        }
+      }
+      return a;
+    }
+  }
+  function _nonIterableRest() {
+    throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+  }
+  function _nonIterableSpread() {
+    throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+  }
+  function _slicedToArray(r, e) {
+    return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _nonIterableRest();
+  }
+  function _toConsumableArray(r) {
+    return _arrayWithoutHoles(r) || _iterableToArray(r) || _unsupportedIterableToArray(r) || _nonIterableSpread();
+  }
+  function _typeof(o) {
+    "@babel/helpers - typeof";
+
+    return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) {
+      return typeof o;
+    } : function (o) {
+      return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o;
+    }, _typeof(o);
+  }
+  function _unsupportedIterableToArray(r, a) {
+    if (r) {
+      if ("string" == typeof r) return _arrayLikeToArray(r, a);
+      var t = {}.toString.call(r).slice(8, -1);
+      return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0;
+    }
+  }
+
+  var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};
+
+  function createCommonjsModule(fn, module) {
+  	return module = { exports: {} }, fn(module, module.exports), module.exports;
+  }
+
+  var parser = createCommonjsModule(function (module) {
+    /*
+     * Generated by PEG.js 0.10.0.
+     *
+     * http://pegjs.org/
+     */
+    (function (root, factory) {
+      if ( module.exports) {
+        module.exports = factory();
+      }
+    })(commonjsGlobal, function () {
+
+      function peg$subclass(child, parent) {
+        function ctor() {
+          this.constructor = child;
+        }
+        ctor.prototype = parent.prototype;
+        child.prototype = new ctor();
+      }
+      function peg$SyntaxError(message, expected, found, location) {
+        this.message = message;
+        this.expected = expected;
+        this.found = found;
+        this.location = location;
+        this.name = "SyntaxError";
+        if (typeof Error.captureStackTrace === "function") {
+          Error.captureStackTrace(this, peg$SyntaxError);
+        }
+      }
+      peg$subclass(peg$SyntaxError, Error);
+      peg$SyntaxError.buildMessage = function (expected, found) {
+        var DESCRIBE_EXPECTATION_FNS = {
+          literal: function literal(expectation) {
+            return "\"" + literalEscape(expectation.text) + "\"";
+          },
+          "class": function _class(expectation) {
+            var escapedParts = "",
+              i;
+            for (i = 0; i < expectation.parts.length; i++) {
+              escapedParts += expectation.parts[i] instanceof Array ? classEscape(expectation.parts[i][0]) + "-" + classEscape(expectation.parts[i][1]) : classEscape(expectation.parts[i]);
+            }
+            return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
+          },
+          any: function any(expectation) {
+            return "any character";
+          },
+          end: function end(expectation) {
+            return "end of input";
+          },
+          other: function other(expectation) {
+            return expectation.description;
+          }
+        };
+        function hex(ch) {
+          return ch.charCodeAt(0).toString(16).toUpperCase();
+        }
+        function literalEscape(s) {
+          return s.replace(/\\/g, '\\\\').replace(/"/g, '\\"').replace(/\0/g, '\\0').replace(/\t/g, '\\t').replace(/\n/g, '\\n').replace(/\r/g, '\\r').replace(/[\x00-\x0F]/g, function (ch) {
+            return '\\x0' + hex(ch);
+          }).replace(/[\x10-\x1F\x7F-\x9F]/g, function (ch) {
+            return '\\x' + hex(ch);
+          });
+        }
+        function classEscape(s) {
+          return s.replace(/\\/g, '\\\\').replace(/\]/g, '\\]').replace(/\^/g, '\\^').replace(/-/g, '\\-').replace(/\0/g, '\\0').replace(/\t/g, '\\t').replace(/\n/g, '\\n').replace(/\r/g, '\\r').replace(/[\x00-\x0F]/g, function (ch) {
+            return '\\x0' + hex(ch);
+          }).replace(/[\x10-\x1F\x7F-\x9F]/g, function (ch) {
+            return '\\x' + hex(ch);
+          });
+        }
+        function describeExpectation(expectation) {
+          return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
+        }
+        function describeExpected(expected) {
+          var descriptions = new Array(expected.length),
+            i,
+            j;
+          for (i = 0; i < expected.length; i++) {
+            descriptions[i] = describeExpectation(expected[i]);
+          }
+          descriptions.sort();
+          if (descriptions.length > 0) {
+            for (i = 1, j = 1; i < descriptions.length; i++) {
+              if (descriptions[i - 1] !== descriptions[i]) {
+                descriptions[j] = descriptions[i];
+                j++;
+              }
+            }
+            descriptions.length = j;
+          }
+          switch (descriptions.length) {
+            case 1:
+              return descriptions[0];
+            case 2:
+              return descriptions[0] + " or " + descriptions[1];
+            default:
+              return descriptions.slice(0, -1).join(", ") + ", or " + descriptions[descriptions.length - 1];
+          }
+        }
+        function describeFound(found) {
+          return found ? "\"" + literalEscape(found) + "\"" : "end of input";
+        }
+        return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
+      };
+      function peg$parse(input, options) {
+        options = options !== void 0 ? options : {};
+        var peg$FAILED = {},
+          peg$startRuleFunctions = {
+            start: peg$parsestart
+          },
+          peg$startRuleFunction = peg$parsestart,
+          peg$c0 = function peg$c0(ss) {
+            return ss.length === 1 ? ss[0] : {
+              type: 'matches',
+              selectors: ss
+            };
+          },
+          peg$c1 = function peg$c1() {
+            return void 0;
+          },
+          peg$c2 = " ",
+          peg$c3 = peg$literalExpectation(" ", false),
+          peg$c4 = /^[^ [\],():#!=><~+.]/,
+          peg$c5 = peg$classExpectation([" ", "[", "]", ",", "(", ")", ":", "#", "!", "=", ">", "<", "~", "+", "."], true, false),
+          peg$c6 = function peg$c6(i) {
+            return i.join('');
+          },
+          peg$c7 = ">",
+          peg$c8 = peg$literalExpectation(">", false),
+          peg$c9 = function peg$c9() {
+            return 'child';
+          },
+          peg$c10 = "~",
+          peg$c11 = peg$literalExpectation("~", false),
+          peg$c12 = function peg$c12() {
+            return 'sibling';
+          },
+          peg$c13 = "+",
+          peg$c14 = peg$literalExpectation("+", false),
+          peg$c15 = function peg$c15() {
+            return 'adjacent';
+          },
+          peg$c16 = function peg$c16() {
+            return 'descendant';
+          },
+          peg$c17 = ",",
+          peg$c18 = peg$literalExpectation(",", false),
+          peg$c19 = function peg$c19(s, ss) {
+            return [s].concat(ss.map(function (s) {
+              return s[3];
+            }));
+          },
+          peg$c20 = function peg$c20(op, s) {
+            if (!op) return s;
+            return {
+              type: op,
+              left: {
+                type: 'exactNode'
+              },
+              right: s
+            };
+          },
+          peg$c21 = function peg$c21(a, ops) {
+            return ops.reduce(function (memo, rhs) {
+              return {
+                type: rhs[0],
+                left: memo,
+                right: rhs[1]
+              };
+            }, a);
+          },
+          peg$c22 = "!",
+          peg$c23 = peg$literalExpectation("!", false),
+          peg$c24 = function peg$c24(subject, as) {
+            var b = as.length === 1 ? as[0] : {
+              type: 'compound',
+              selectors: as
+            };
+            if (subject) b.subject = true;
+            return b;
+          },
+          peg$c25 = "*",
+          peg$c26 = peg$literalExpectation("*", false),
+          peg$c27 = function peg$c27(a) {
+            return {
+              type: 'wildcard',
+              value: a
+            };
+          },
+          peg$c28 = "#",
+          peg$c29 = peg$literalExpectation("#", false),
+          peg$c30 = function peg$c30(i) {
+            return {
+              type: 'identifier',
+              value: i
+            };
+          },
+          peg$c31 = "[",
+          peg$c32 = peg$literalExpectation("[", false),
+          peg$c33 = "]",
+          peg$c34 = peg$literalExpectation("]", false),
+          peg$c35 = function peg$c35(v) {
+            return v;
+          },
+          peg$c36 = /^[><!]/,
+          peg$c37 = peg$classExpectation([">", "<", "!"], false, false),
+          peg$c38 = "=",
+          peg$c39 = peg$literalExpectation("=", false),
+          peg$c40 = function peg$c40(a) {
+            return (a || '') + '=';
+          },
+          peg$c41 = /^[><]/,
+          peg$c42 = peg$classExpectation([">", "<"], false, false),
+          peg$c43 = ".",
+          peg$c44 = peg$literalExpectation(".", false),
+          peg$c45 = function peg$c45(a, as) {
+            return [].concat.apply([a], as).join('');
+          },
+          peg$c46 = function peg$c46(name, op, value) {
+            return {
+              type: 'attribute',
+              name: name,
+              operator: op,
+              value: value
+            };
+          },
+          peg$c47 = function peg$c47(name) {
+            return {
+              type: 'attribute',
+              name: name
+            };
+          },
+          peg$c48 = "\"",
+          peg$c49 = peg$literalExpectation("\"", false),
+          peg$c50 = /^[^\\"]/,
+          peg$c51 = peg$classExpectation(["\\", "\""], true, false),
+          peg$c52 = "\\",
+          peg$c53 = peg$literalExpectation("\\", false),
+          peg$c54 = peg$anyExpectation(),
+          peg$c55 = function peg$c55(a, b) {
+            return a + b;
+          },
+          peg$c56 = function peg$c56(d) {
+            return {
+              type: 'literal',
+              value: strUnescape(d.join(''))
+            };
+          },
+          peg$c57 = "'",
+          peg$c58 = peg$literalExpectation("'", false),
+          peg$c59 = /^[^\\']/,
+          peg$c60 = peg$classExpectation(["\\", "'"], true, false),
+          peg$c61 = /^[0-9]/,
+          peg$c62 = peg$classExpectation([["0", "9"]], false, false),
+          peg$c63 = function peg$c63(a, b) {
+            // Can use `a.flat().join('')` once supported
+            var leadingDecimals = a ? [].concat.apply([], a).join('') : '';
+            return {
+              type: 'literal',
+              value: parseFloat(leadingDecimals + b.join(''))
+            };
+          },
+          peg$c64 = function peg$c64(i) {
+            return {
+              type: 'literal',
+              value: i
+            };
+          },
+          peg$c65 = "type(",
+          peg$c66 = peg$literalExpectation("type(", false),
+          peg$c67 = /^[^ )]/,
+          peg$c68 = peg$classExpectation([" ", ")"], true, false),
+          peg$c69 = ")",
+          peg$c70 = peg$literalExpectation(")", false),
+          peg$c71 = function peg$c71(t) {
+            return {
+              type: 'type',
+              value: t.join('')
+            };
+          },
+          peg$c72 = /^[imsu]/,
+          peg$c73 = peg$classExpectation(["i", "m", "s", "u"], false, false),
+          peg$c74 = "/",
+          peg$c75 = peg$literalExpectation("/", false),
+          peg$c76 = function peg$c76(pattern, flgs) {
+            return {
+              type: 'regexp',
+              value: new RegExp(pattern.join(''), flgs ? flgs.join('') : '')
+            };
+          },
+          peg$c77 = /^[^\]\\]/,
+          peg$c78 = peg$classExpectation(["]", "\\"], true, false),
+          peg$c79 = function peg$c79(cs) {
+            return '[' + cs.join('') + ']';
+          },
+          peg$c80 = function peg$c80(a) {
+            return '\\' + a;
+          },
+          peg$c81 = /^[^\/\\[]/,
+          peg$c82 = peg$classExpectation(["/", "\\", "["], true, false),
+          peg$c83 = function peg$c83(cs) {
+            return cs.join('');
+          },
+          peg$c84 = function peg$c84(i, is) {
+            return {
+              type: 'field',
+              name: is.reduce(function (memo, p) {
+                return memo + p[0] + p[1];
+              }, i)
+            };
+          },
+          peg$c85 = ":not(",
+          peg$c86 = peg$literalExpectation(":not(", false),
+          peg$c87 = function peg$c87(ss) {
+            return {
+              type: 'not',
+              selectors: ss
+            };
+          },
+          peg$c88 = ":matches(",
+          peg$c89 = peg$literalExpectation(":matches(", false),
+          peg$c90 = function peg$c90(ss) {
+            return {
+              type: 'matches',
+              selectors: ss
+            };
+          },
+          peg$c91 = ":is(",
+          peg$c92 = peg$literalExpectation(":is(", false),
+          peg$c93 = ":has(",
+          peg$c94 = peg$literalExpectation(":has(", false),
+          peg$c95 = function peg$c95(ss) {
+            return {
+              type: 'has',
+              selectors: ss
+            };
+          },
+          peg$c96 = ":first-child",
+          peg$c97 = peg$literalExpectation(":first-child", false),
+          peg$c98 = function peg$c98() {
+            return nth(1);
+          },
+          peg$c99 = ":last-child",
+          peg$c100 = peg$literalExpectation(":last-child", false),
+          peg$c101 = function peg$c101() {
+            return nthLast(1);
+          },
+          peg$c102 = ":nth-child(",
+          peg$c103 = peg$literalExpectation(":nth-child(", false),
+          peg$c104 = function peg$c104(n) {
+            return nth(parseInt(n.join(''), 10));
+          },
+          peg$c105 = ":nth-last-child(",
+          peg$c106 = peg$literalExpectation(":nth-last-child(", false),
+          peg$c107 = function peg$c107(n) {
+            return nthLast(parseInt(n.join(''), 10));
+          },
+          peg$c108 = ":",
+          peg$c109 = peg$literalExpectation(":", false),
+          peg$c110 = function peg$c110(c) {
+            return {
+              type: 'class',
+              name: c
+            };
+          },
+          peg$currPos = 0,
+          peg$posDetailsCache = [{
+            line: 1,
+            column: 1
+          }],
+          peg$maxFailPos = 0,
+          peg$maxFailExpected = [],
+          peg$resultsCache = {},
+          peg$result;
+        if ("startRule" in options) {
+          if (!(options.startRule in peg$startRuleFunctions)) {
+            throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
+          }
+          peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
+        }
+        function peg$literalExpectation(text, ignoreCase) {
+          return {
+            type: "literal",
+            text: text,
+            ignoreCase: ignoreCase
+          };
+        }
+        function peg$classExpectation(parts, inverted, ignoreCase) {
+          return {
+            type: "class",
+            parts: parts,
+            inverted: inverted,
+            ignoreCase: ignoreCase
+          };
+        }
+        function peg$anyExpectation() {
+          return {
+            type: "any"
+          };
+        }
+        function peg$endExpectation() {
+          return {
+            type: "end"
+          };
+        }
+        function peg$computePosDetails(pos) {
+          var details = peg$posDetailsCache[pos],
+            p;
+          if (details) {
+            return details;
+          } else {
+            p = pos - 1;
+            while (!peg$posDetailsCache[p]) {
+              p--;
+            }
+            details = peg$posDetailsCache[p];
+            details = {
+              line: details.line,
+              column: details.column
+            };
+            while (p < pos) {
+              if (input.charCodeAt(p) === 10) {
+                details.line++;
+                details.column = 1;
+              } else {
+                details.column++;
+              }
+              p++;
+            }
+            peg$posDetailsCache[pos] = details;
+            return details;
+          }
+        }
+        function peg$computeLocation(startPos, endPos) {
+          var startPosDetails = peg$computePosDetails(startPos),
+            endPosDetails = peg$computePosDetails(endPos);
+          return {
+            start: {
+              offset: startPos,
+              line: startPosDetails.line,
+              column: startPosDetails.column
+            },
+            end: {
+              offset: endPos,
+              line: endPosDetails.line,
+              column: endPosDetails.column
+            }
+          };
+        }
+        function peg$fail(expected) {
+          if (peg$currPos < peg$maxFailPos) {
+            return;
+          }
+          if (peg$currPos > peg$maxFailPos) {
+            peg$maxFailPos = peg$currPos;
+            peg$maxFailExpected = [];
+          }
+          peg$maxFailExpected.push(expected);
+        }
+        function peg$buildStructuredError(expected, found, location) {
+          return new peg$SyntaxError(peg$SyntaxError.buildMessage(expected, found), expected, found, location);
+        }
+        function peg$parsestart() {
+          var s0, s1, s2, s3;
+          var key = peg$currPos * 36 + 0,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parse_();
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parseselectors();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parse_();
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c0(s2);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            s1 = peg$parse_();
+            if (s1 !== peg$FAILED) {
+              s1 = peg$c1();
+            }
+            s0 = s1;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parse_() {
+          var s0, s1;
+          var key = peg$currPos * 36 + 1,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = [];
+          if (input.charCodeAt(peg$currPos) === 32) {
+            s1 = peg$c2;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c3);
+            }
+          }
+          while (s1 !== peg$FAILED) {
+            s0.push(s1);
+            if (input.charCodeAt(peg$currPos) === 32) {
+              s1 = peg$c2;
+              peg$currPos++;
+            } else {
+              s1 = peg$FAILED;
+              {
+                peg$fail(peg$c3);
+              }
+            }
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseidentifierName() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 2,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = [];
+          if (peg$c4.test(input.charAt(peg$currPos))) {
+            s2 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            {
+              peg$fail(peg$c5);
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            while (s2 !== peg$FAILED) {
+              s1.push(s2);
+              if (peg$c4.test(input.charAt(peg$currPos))) {
+                s2 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s2 = peg$FAILED;
+                {
+                  peg$fail(peg$c5);
+                }
+              }
+            }
+          } else {
+            s1 = peg$FAILED;
+          }
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c6(s1);
+          }
+          s0 = s1;
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsebinaryOp() {
+          var s0, s1, s2, s3;
+          var key = peg$currPos * 36 + 3,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parse_();
+          if (s1 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 62) {
+              s2 = peg$c7;
+              peg$currPos++;
+            } else {
+              s2 = peg$FAILED;
+              {
+                peg$fail(peg$c8);
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parse_();
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c9();
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            s1 = peg$parse_();
+            if (s1 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 126) {
+                s2 = peg$c10;
+                peg$currPos++;
+              } else {
+                s2 = peg$FAILED;
+                {
+                  peg$fail(peg$c11);
+                }
+              }
+              if (s2 !== peg$FAILED) {
+                s3 = peg$parse_();
+                if (s3 !== peg$FAILED) {
+                  s1 = peg$c12();
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+            if (s0 === peg$FAILED) {
+              s0 = peg$currPos;
+              s1 = peg$parse_();
+              if (s1 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 43) {
+                  s2 = peg$c13;
+                  peg$currPos++;
+                } else {
+                  s2 = peg$FAILED;
+                  {
+                    peg$fail(peg$c14);
+                  }
+                }
+                if (s2 !== peg$FAILED) {
+                  s3 = peg$parse_();
+                  if (s3 !== peg$FAILED) {
+                    s1 = peg$c15();
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+              if (s0 === peg$FAILED) {
+                s0 = peg$currPos;
+                if (input.charCodeAt(peg$currPos) === 32) {
+                  s1 = peg$c2;
+                  peg$currPos++;
+                } else {
+                  s1 = peg$FAILED;
+                  {
+                    peg$fail(peg$c3);
+                  }
+                }
+                if (s1 !== peg$FAILED) {
+                  s2 = peg$parse_();
+                  if (s2 !== peg$FAILED) {
+                    s1 = peg$c16();
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              }
+            }
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsehasSelectors() {
+          var s0, s1, s2, s3, s4, s5, s6, s7;
+          var key = peg$currPos * 36 + 4,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parsehasSelector();
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            s3 = peg$currPos;
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 44) {
+                s5 = peg$c17;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                {
+                  peg$fail(peg$c18);
+                }
+              }
+              if (s5 !== peg$FAILED) {
+                s6 = peg$parse_();
+                if (s6 !== peg$FAILED) {
+                  s7 = peg$parsehasSelector();
+                  if (s7 !== peg$FAILED) {
+                    s4 = [s4, s5, s6, s7];
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              s3 = peg$currPos;
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 44) {
+                  s5 = peg$c17;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c18);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s6 = peg$parse_();
+                  if (s6 !== peg$FAILED) {
+                    s7 = peg$parsehasSelector();
+                    if (s7 !== peg$FAILED) {
+                      s4 = [s4, s5, s6, s7];
+                      s3 = s4;
+                    } else {
+                      peg$currPos = s3;
+                      s3 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c19(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseselectors() {
+          var s0, s1, s2, s3, s4, s5, s6, s7;
+          var key = peg$currPos * 36 + 5,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parseselector();
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            s3 = peg$currPos;
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 44) {
+                s5 = peg$c17;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                {
+                  peg$fail(peg$c18);
+                }
+              }
+              if (s5 !== peg$FAILED) {
+                s6 = peg$parse_();
+                if (s6 !== peg$FAILED) {
+                  s7 = peg$parseselector();
+                  if (s7 !== peg$FAILED) {
+                    s4 = [s4, s5, s6, s7];
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              s3 = peg$currPos;
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 44) {
+                  s5 = peg$c17;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c18);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s6 = peg$parse_();
+                  if (s6 !== peg$FAILED) {
+                    s7 = peg$parseselector();
+                    if (s7 !== peg$FAILED) {
+                      s4 = [s4, s5, s6, s7];
+                      s3 = s4;
+                    } else {
+                      peg$currPos = s3;
+                      s3 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c19(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsehasSelector() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 6,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parsebinaryOp();
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parseselector();
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c20(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseselector() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 7,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parsesequence();
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            s3 = peg$currPos;
+            s4 = peg$parsebinaryOp();
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parsesequence();
+              if (s5 !== peg$FAILED) {
+                s4 = [s4, s5];
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              s3 = peg$currPos;
+              s4 = peg$parsebinaryOp();
+              if (s4 !== peg$FAILED) {
+                s5 = peg$parsesequence();
+                if (s5 !== peg$FAILED) {
+                  s4 = [s4, s5];
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c21(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsesequence() {
+          var s0, s1, s2, s3;
+          var key = peg$currPos * 36 + 8,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 33) {
+            s1 = peg$c22;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c23);
+            }
+          }
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            s3 = peg$parseatom();
+            if (s3 !== peg$FAILED) {
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                s3 = peg$parseatom();
+              }
+            } else {
+              s2 = peg$FAILED;
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c24(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseatom() {
+          var s0;
+          var key = peg$currPos * 36 + 9,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$parsewildcard();
+          if (s0 === peg$FAILED) {
+            s0 = peg$parseidentifier();
+            if (s0 === peg$FAILED) {
+              s0 = peg$parseattr();
+              if (s0 === peg$FAILED) {
+                s0 = peg$parsefield();
+                if (s0 === peg$FAILED) {
+                  s0 = peg$parsenegation();
+                  if (s0 === peg$FAILED) {
+                    s0 = peg$parsematches();
+                    if (s0 === peg$FAILED) {
+                      s0 = peg$parseis();
+                      if (s0 === peg$FAILED) {
+                        s0 = peg$parsehas();
+                        if (s0 === peg$FAILED) {
+                          s0 = peg$parsefirstChild();
+                          if (s0 === peg$FAILED) {
+                            s0 = peg$parselastChild();
+                            if (s0 === peg$FAILED) {
+                              s0 = peg$parsenthChild();
+                              if (s0 === peg$FAILED) {
+                                s0 = peg$parsenthLastChild();
+                                if (s0 === peg$FAILED) {
+                                  s0 = peg$parseclass();
+                                }
+                              }
+                            }
+                          }
+                        }
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsewildcard() {
+          var s0, s1;
+          var key = peg$currPos * 36 + 10,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 42) {
+            s1 = peg$c25;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c26);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c27(s1);
+          }
+          s0 = s1;
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseidentifier() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 11,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 35) {
+            s1 = peg$c28;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c29);
+            }
+          }
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parseidentifierName();
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c30(s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseattr() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 12,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 91) {
+            s1 = peg$c31;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c32);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parseattrValue();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 93) {
+                    s5 = peg$c33;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c34);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c35(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseattrOps() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 13,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (peg$c36.test(input.charAt(peg$currPos))) {
+            s1 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c37);
+            }
+          }
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 61) {
+              s2 = peg$c38;
+              peg$currPos++;
+            } else {
+              s2 = peg$FAILED;
+              {
+                peg$fail(peg$c39);
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c40(s1);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            if (peg$c41.test(input.charAt(peg$currPos))) {
+              s0 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s0 = peg$FAILED;
+              {
+                peg$fail(peg$c42);
+              }
+            }
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseattrEqOps() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 14,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 33) {
+            s1 = peg$c22;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c23);
+            }
+          }
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 61) {
+              s2 = peg$c38;
+              peg$currPos++;
+            } else {
+              s2 = peg$FAILED;
+              {
+                peg$fail(peg$c39);
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c40(s1);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseattrName() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 15,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parseidentifierName();
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            s3 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 46) {
+              s4 = peg$c43;
+              peg$currPos++;
+            } else {
+              s4 = peg$FAILED;
+              {
+                peg$fail(peg$c44);
+              }
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseidentifierName();
+              if (s5 !== peg$FAILED) {
+                s4 = [s4, s5];
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              s3 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 46) {
+                s4 = peg$c43;
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                {
+                  peg$fail(peg$c44);
+                }
+              }
+              if (s4 !== peg$FAILED) {
+                s5 = peg$parseidentifierName();
+                if (s5 !== peg$FAILED) {
+                  s4 = [s4, s5];
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c45(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseattrValue() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 16,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parseattrName();
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parseattrEqOps();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  s5 = peg$parsetype();
+                  if (s5 === peg$FAILED) {
+                    s5 = peg$parseregex();
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c46(s1, s3, s5);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            s1 = peg$parseattrName();
+            if (s1 !== peg$FAILED) {
+              s2 = peg$parse_();
+              if (s2 !== peg$FAILED) {
+                s3 = peg$parseattrOps();
+                if (s3 !== peg$FAILED) {
+                  s4 = peg$parse_();
+                  if (s4 !== peg$FAILED) {
+                    s5 = peg$parsestring();
+                    if (s5 === peg$FAILED) {
+                      s5 = peg$parsenumber();
+                      if (s5 === peg$FAILED) {
+                        s5 = peg$parsepath();
+                      }
+                    }
+                    if (s5 !== peg$FAILED) {
+                      s1 = peg$c46(s1, s3, s5);
+                      s0 = s1;
+                    } else {
+                      peg$currPos = s0;
+                      s0 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+            if (s0 === peg$FAILED) {
+              s0 = peg$currPos;
+              s1 = peg$parseattrName();
+              if (s1 !== peg$FAILED) {
+                s1 = peg$c47(s1);
+              }
+              s0 = s1;
+            }
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsestring() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 17,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 34) {
+            s1 = peg$c48;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c49);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            if (peg$c50.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c51);
+              }
+            }
+            if (s3 === peg$FAILED) {
+              s3 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 92) {
+                s4 = peg$c52;
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                {
+                  peg$fail(peg$c53);
+                }
+              }
+              if (s4 !== peg$FAILED) {
+                if (input.length > peg$currPos) {
+                  s5 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c54);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s4 = peg$c55(s4, s5);
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+            while (s3 !== peg$FAILED) {
+              s2.push(s3);
+              if (peg$c50.test(input.charAt(peg$currPos))) {
+                s3 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c51);
+                }
+              }
+              if (s3 === peg$FAILED) {
+                s3 = peg$currPos;
+                if (input.charCodeAt(peg$currPos) === 92) {
+                  s4 = peg$c52;
+                  peg$currPos++;
+                } else {
+                  s4 = peg$FAILED;
+                  {
+                    peg$fail(peg$c53);
+                  }
+                }
+                if (s4 !== peg$FAILED) {
+                  if (input.length > peg$currPos) {
+                    s5 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c54);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s4 = peg$c55(s4, s5);
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 34) {
+                s3 = peg$c48;
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c49);
+                }
+              }
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c56(s2);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 39) {
+              s1 = peg$c57;
+              peg$currPos++;
+            } else {
+              s1 = peg$FAILED;
+              {
+                peg$fail(peg$c58);
+              }
+            }
+            if (s1 !== peg$FAILED) {
+              s2 = [];
+              if (peg$c59.test(input.charAt(peg$currPos))) {
+                s3 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c60);
+                }
+              }
+              if (s3 === peg$FAILED) {
+                s3 = peg$currPos;
+                if (input.charCodeAt(peg$currPos) === 92) {
+                  s4 = peg$c52;
+                  peg$currPos++;
+                } else {
+                  s4 = peg$FAILED;
+                  {
+                    peg$fail(peg$c53);
+                  }
+                }
+                if (s4 !== peg$FAILED) {
+                  if (input.length > peg$currPos) {
+                    s5 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c54);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s4 = peg$c55(s4, s5);
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              }
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                if (peg$c59.test(input.charAt(peg$currPos))) {
+                  s3 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s3 = peg$FAILED;
+                  {
+                    peg$fail(peg$c60);
+                  }
+                }
+                if (s3 === peg$FAILED) {
+                  s3 = peg$currPos;
+                  if (input.charCodeAt(peg$currPos) === 92) {
+                    s4 = peg$c52;
+                    peg$currPos++;
+                  } else {
+                    s4 = peg$FAILED;
+                    {
+                      peg$fail(peg$c53);
+                    }
+                  }
+                  if (s4 !== peg$FAILED) {
+                    if (input.length > peg$currPos) {
+                      s5 = input.charAt(peg$currPos);
+                      peg$currPos++;
+                    } else {
+                      s5 = peg$FAILED;
+                      {
+                        peg$fail(peg$c54);
+                      }
+                    }
+                    if (s5 !== peg$FAILED) {
+                      s4 = peg$c55(s4, s5);
+                      s3 = s4;
+                    } else {
+                      peg$currPos = s3;
+                      s3 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                }
+              }
+              if (s2 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 39) {
+                  s3 = peg$c57;
+                  peg$currPos++;
+                } else {
+                  s3 = peg$FAILED;
+                  {
+                    peg$fail(peg$c58);
+                  }
+                }
+                if (s3 !== peg$FAILED) {
+                  s1 = peg$c56(s2);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsenumber() {
+          var s0, s1, s2, s3;
+          var key = peg$currPos * 36 + 18,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$currPos;
+          s2 = [];
+          if (peg$c61.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            {
+              peg$fail(peg$c62);
+            }
+          }
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            if (peg$c61.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c62);
+              }
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 46) {
+              s3 = peg$c43;
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c44);
+              }
+            }
+            if (s3 !== peg$FAILED) {
+              s2 = [s2, s3];
+              s1 = s2;
+            } else {
+              peg$currPos = s1;
+              s1 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s1;
+            s1 = peg$FAILED;
+          }
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            if (peg$c61.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c62);
+              }
+            }
+            if (s3 !== peg$FAILED) {
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                if (peg$c61.test(input.charAt(peg$currPos))) {
+                  s3 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s3 = peg$FAILED;
+                  {
+                    peg$fail(peg$c62);
+                  }
+                }
+              }
+            } else {
+              s2 = peg$FAILED;
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c63(s1, s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsepath() {
+          var s0, s1;
+          var key = peg$currPos * 36 + 19,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = peg$parseidentifierName();
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c64(s1);
+          }
+          s0 = s1;
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsetype() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 20,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 5) === peg$c65) {
+            s1 = peg$c65;
+            peg$currPos += 5;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c66);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = [];
+              if (peg$c67.test(input.charAt(peg$currPos))) {
+                s4 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                {
+                  peg$fail(peg$c68);
+                }
+              }
+              if (s4 !== peg$FAILED) {
+                while (s4 !== peg$FAILED) {
+                  s3.push(s4);
+                  if (peg$c67.test(input.charAt(peg$currPos))) {
+                    s4 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s4 = peg$FAILED;
+                    {
+                      peg$fail(peg$c68);
+                    }
+                  }
+                }
+              } else {
+                s3 = peg$FAILED;
+              }
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c71(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseflags() {
+          var s0, s1;
+          var key = peg$currPos * 36 + 21,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = [];
+          if (peg$c72.test(input.charAt(peg$currPos))) {
+            s1 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c73);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            while (s1 !== peg$FAILED) {
+              s0.push(s1);
+              if (peg$c72.test(input.charAt(peg$currPos))) {
+                s1 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s1 = peg$FAILED;
+                {
+                  peg$fail(peg$c73);
+                }
+              }
+            }
+          } else {
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseregex() {
+          var s0, s1, s2, s3, s4;
+          var key = peg$currPos * 36 + 22,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 47) {
+            s1 = peg$c74;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c75);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            s3 = peg$parsere_character_class();
+            if (s3 === peg$FAILED) {
+              s3 = peg$parsere_escape();
+              if (s3 === peg$FAILED) {
+                s3 = peg$parsere_chars();
+              }
+            }
+            if (s3 !== peg$FAILED) {
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                s3 = peg$parsere_character_class();
+                if (s3 === peg$FAILED) {
+                  s3 = peg$parsere_escape();
+                  if (s3 === peg$FAILED) {
+                    s3 = peg$parsere_chars();
+                  }
+                }
+              }
+            } else {
+              s2 = peg$FAILED;
+            }
+            if (s2 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 47) {
+                s3 = peg$c74;
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c75);
+                }
+              }
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parseflags();
+                if (s4 === peg$FAILED) {
+                  s4 = null;
+                }
+                if (s4 !== peg$FAILED) {
+                  s1 = peg$c76(s2, s4);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsere_character_class() {
+          var s0, s1, s2, s3;
+          var key = peg$currPos * 36 + 23,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 91) {
+            s1 = peg$c31;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c32);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            if (peg$c77.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              {
+                peg$fail(peg$c78);
+              }
+            }
+            if (s3 === peg$FAILED) {
+              s3 = peg$parsere_escape();
+            }
+            if (s3 !== peg$FAILED) {
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                if (peg$c77.test(input.charAt(peg$currPos))) {
+                  s3 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s3 = peg$FAILED;
+                  {
+                    peg$fail(peg$c78);
+                  }
+                }
+                if (s3 === peg$FAILED) {
+                  s3 = peg$parsere_escape();
+                }
+              }
+            } else {
+              s2 = peg$FAILED;
+            }
+            if (s2 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 93) {
+                s3 = peg$c33;
+                peg$currPos++;
+              } else {
+                s3 = peg$FAILED;
+                {
+                  peg$fail(peg$c34);
+                }
+              }
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c79(s2);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsere_escape() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 24,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 92) {
+            s1 = peg$c52;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c53);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            if (input.length > peg$currPos) {
+              s2 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s2 = peg$FAILED;
+              {
+                peg$fail(peg$c54);
+              }
+            }
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c80(s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsere_chars() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 25,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          s1 = [];
+          if (peg$c81.test(input.charAt(peg$currPos))) {
+            s2 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            {
+              peg$fail(peg$c82);
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            while (s2 !== peg$FAILED) {
+              s1.push(s2);
+              if (peg$c81.test(input.charAt(peg$currPos))) {
+                s2 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s2 = peg$FAILED;
+                {
+                  peg$fail(peg$c82);
+                }
+              }
+            }
+          } else {
+            s1 = peg$FAILED;
+          }
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c83(s1);
+          }
+          s0 = s1;
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsefield() {
+          var s0, s1, s2, s3, s4, s5, s6;
+          var key = peg$currPos * 36 + 26,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 46) {
+            s1 = peg$c43;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c44);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parseidentifierName();
+            if (s2 !== peg$FAILED) {
+              s3 = [];
+              s4 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 46) {
+                s5 = peg$c43;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                {
+                  peg$fail(peg$c44);
+                }
+              }
+              if (s5 !== peg$FAILED) {
+                s6 = peg$parseidentifierName();
+                if (s6 !== peg$FAILED) {
+                  s5 = [s5, s6];
+                  s4 = s5;
+                } else {
+                  peg$currPos = s4;
+                  s4 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s4;
+                s4 = peg$FAILED;
+              }
+              while (s4 !== peg$FAILED) {
+                s3.push(s4);
+                s4 = peg$currPos;
+                if (input.charCodeAt(peg$currPos) === 46) {
+                  s5 = peg$c43;
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  {
+                    peg$fail(peg$c44);
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s6 = peg$parseidentifierName();
+                  if (s6 !== peg$FAILED) {
+                    s5 = [s5, s6];
+                    s4 = s5;
+                  } else {
+                    peg$currPos = s4;
+                    s4 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s4;
+                  s4 = peg$FAILED;
+                }
+              }
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c84(s2, s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsenegation() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 27,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 5) === peg$c85) {
+            s1 = peg$c85;
+            peg$currPos += 5;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c86);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parseselectors();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c87(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsematches() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 28,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 9) === peg$c88) {
+            s1 = peg$c88;
+            peg$currPos += 9;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c89);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parseselectors();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c90(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseis() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 29,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 4) === peg$c91) {
+            s1 = peg$c91;
+            peg$currPos += 4;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c92);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parseselectors();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c90(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsehas() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 30,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 5) === peg$c93) {
+            s1 = peg$c93;
+            peg$currPos += 5;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c94);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parsehasSelectors();
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c95(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsefirstChild() {
+          var s0, s1;
+          var key = peg$currPos * 36 + 31,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 12) === peg$c96) {
+            s1 = peg$c96;
+            peg$currPos += 12;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c97);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c98();
+          }
+          s0 = s1;
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parselastChild() {
+          var s0, s1;
+          var key = peg$currPos * 36 + 32,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 11) === peg$c99) {
+            s1 = peg$c99;
+            peg$currPos += 11;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c100);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s1 = peg$c101();
+          }
+          s0 = s1;
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsenthChild() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 33,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 11) === peg$c102) {
+            s1 = peg$c102;
+            peg$currPos += 11;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c103);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = [];
+              if (peg$c61.test(input.charAt(peg$currPos))) {
+                s4 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                {
+                  peg$fail(peg$c62);
+                }
+              }
+              if (s4 !== peg$FAILED) {
+                while (s4 !== peg$FAILED) {
+                  s3.push(s4);
+                  if (peg$c61.test(input.charAt(peg$currPos))) {
+                    s4 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s4 = peg$FAILED;
+                    {
+                      peg$fail(peg$c62);
+                    }
+                  }
+                }
+              } else {
+                s3 = peg$FAILED;
+              }
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c104(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parsenthLastChild() {
+          var s0, s1, s2, s3, s4, s5;
+          var key = peg$currPos * 36 + 34,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.substr(peg$currPos, 16) === peg$c105) {
+            s1 = peg$c105;
+            peg$currPos += 16;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c106);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parse_();
+            if (s2 !== peg$FAILED) {
+              s3 = [];
+              if (peg$c61.test(input.charAt(peg$currPos))) {
+                s4 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                {
+                  peg$fail(peg$c62);
+                }
+              }
+              if (s4 !== peg$FAILED) {
+                while (s4 !== peg$FAILED) {
+                  s3.push(s4);
+                  if (peg$c61.test(input.charAt(peg$currPos))) {
+                    s4 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s4 = peg$FAILED;
+                    {
+                      peg$fail(peg$c62);
+                    }
+                  }
+                }
+              } else {
+                s3 = peg$FAILED;
+              }
+              if (s3 !== peg$FAILED) {
+                s4 = peg$parse_();
+                if (s4 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c69;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    {
+                      peg$fail(peg$c70);
+                    }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s1 = peg$c107(s3);
+                    s0 = s1;
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function peg$parseclass() {
+          var s0, s1, s2;
+          var key = peg$currPos * 36 + 35,
+            cached = peg$resultsCache[key];
+          if (cached) {
+            peg$currPos = cached.nextPos;
+            return cached.result;
+          }
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 58) {
+            s1 = peg$c108;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            {
+              peg$fail(peg$c109);
+            }
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = peg$parseidentifierName();
+            if (s2 !== peg$FAILED) {
+              s1 = peg$c110(s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          peg$resultsCache[key] = {
+            nextPos: peg$currPos,
+            result: s0
+          };
+          return s0;
+        }
+        function nth(n) {
+          return {
+            type: 'nth-child',
+            index: {
+              type: 'literal',
+              value: n
+            }
+          };
+        }
+        function nthLast(n) {
+          return {
+            type: 'nth-last-child',
+            index: {
+              type: 'literal',
+              value: n
+            }
+          };
+        }
+        function strUnescape(s) {
+          return s.replace(/\\(.)/g, function (match, ch) {
+            switch (ch) {
+              case 'b':
+                return '\b';
+              case 'f':
+                return '\f';
+              case 'n':
+                return '\n';
+              case 'r':
+                return '\r';
+              case 't':
+                return '\t';
+              case 'v':
+                return '\v';
+              default:
+                return ch;
+            }
+          });
+        }
+        peg$result = peg$startRuleFunction();
+        if (peg$result !== peg$FAILED && peg$currPos === input.length) {
+          return peg$result;
+        } else {
+          if (peg$result !== peg$FAILED && peg$currPos < input.length) {
+            peg$fail(peg$endExpectation());
+          }
+          throw peg$buildStructuredError(peg$maxFailExpected, peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null, peg$maxFailPos < input.length ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1) : peg$computeLocation(peg$maxFailPos, peg$maxFailPos));
+        }
+      }
+      return {
+        SyntaxError: peg$SyntaxError,
+        parse: peg$parse
+      };
+    });
+  });
+
+  /**
+  * @typedef {"LEFT_SIDE"|"RIGHT_SIDE"} Side
+  */
+
+  var LEFT_SIDE = 'LEFT_SIDE';
+  var RIGHT_SIDE = 'RIGHT_SIDE';
+
+  /**
+   * @external AST
+   * @see https://esprima.readthedocs.io/en/latest/syntax-tree-format.html
+   */
+
+  /**
+   * One of the rules of `grammar.pegjs`
+   * @typedef {PlainObject} SelectorAST
+   * @see grammar.pegjs
+  */
+
+  /**
+   * The `sequence` production of `grammar.pegjs`
+   * @typedef {PlainObject} SelectorSequenceAST
+  */
+
+  /**
+   * Get the value of a property which may be multiple levels down
+   * in the object.
+   * @param {?PlainObject} obj
+   * @param {string[]} keys
+   * @returns {undefined|boolean|string|number|external:AST}
+   */
+  function getPath(obj, keys) {
+    for (var i = 0; i < keys.length; ++i) {
+      if (obj == null) {
+        return obj;
+      }
+      obj = obj[keys[i]];
+    }
+    return obj;
+  }
+
+  /**
+   * Determine whether `node` can be reached by following `path`,
+   * starting at `ancestor`.
+   * @param {?external:AST} node
+   * @param {?external:AST} ancestor
+   * @param {string[]} path
+   * @param {Integer} fromPathIndex
+   * @returns {boolean}
+   */
+  function inPath(node, ancestor, path, fromPathIndex) {
+    var current = ancestor;
+    for (var i = fromPathIndex; i < path.length; ++i) {
+      if (current == null) {
+        return false;
+      }
+      var field = current[path[i]];
+      if (Array.isArray(field)) {
+        for (var k = 0; k < field.length; ++k) {
+          if (inPath(node, field[k], path, i + 1)) {
+            return true;
+          }
+        }
+        return false;
+      }
+      current = field;
+    }
+    return node === current;
+  }
+
+  /**
+   * A generated matcher function for a selector.
+   * @callback SelectorMatcher
+   * @param {?SelectorAST} selector
+   * @param {external:AST[]} [ancestry=[]]
+   * @param {ESQueryOptions} [options]
+   * @returns {void}
+  */
+
+  /**
+   * A WeakMap for holding cached matcher functions for selectors.
+   * @type {WeakMap<SelectorAST, SelectorMatcher>}
+  */
+  var MATCHER_CACHE = typeof WeakMap === 'function' ? new WeakMap() : null;
+
+  /**
+   * Look up a matcher function for `selector` in the cache.
+   * If it does not exist, generate it with `generateMatcher` and add it to the cache.
+   * In engines without WeakMap, the caching is skipped and matchers are generated with every call.
+   * @param {?SelectorAST} selector
+   * @returns {SelectorMatcher}
+   */
+  function getMatcher(selector) {
+    if (selector == null) {
+      return function () {
+        return true;
+      };
+    }
+    if (MATCHER_CACHE != null) {
+      var matcher = MATCHER_CACHE.get(selector);
+      if (matcher != null) {
+        return matcher;
+      }
+      matcher = generateMatcher(selector);
+      MATCHER_CACHE.set(selector, matcher);
+      return matcher;
+    }
+    return generateMatcher(selector);
+  }
+
+  /**
+   * Create a matcher function for `selector`,
+   * @param {?SelectorAST} selector
+   * @returns {SelectorMatcher}
+   */
+  function generateMatcher(selector) {
+    switch (selector.type) {
+      case 'wildcard':
+        return function () {
+          return true;
+        };
+      case 'identifier':
+        {
+          var value = selector.value.toLowerCase();
+          return function (node, ancestry, options) {
+            var nodeTypeKey = options && options.nodeTypeKey || 'type';
+            return value === node[nodeTypeKey].toLowerCase();
+          };
+        }
+      case 'exactNode':
+        return function (node, ancestry) {
+          return ancestry.length === 0;
+        };
+      case 'field':
+        {
+          var path = selector.name.split('.');
+          return function (node, ancestry) {
+            var ancestor = ancestry[path.length - 1];
+            return inPath(node, ancestor, path, 0);
+          };
+        }
+      case 'matches':
+        {
+          var matchers = selector.selectors.map(getMatcher);
+          return function (node, ancestry, options) {
+            for (var i = 0; i < matchers.length; ++i) {
+              if (matchers[i](node, ancestry, options)) {
+                return true;
+              }
+            }
+            return false;
+          };
+        }
+      case 'compound':
+        {
+          var _matchers = selector.selectors.map(getMatcher);
+          return function (node, ancestry, options) {
+            for (var i = 0; i < _matchers.length; ++i) {
+              if (!_matchers[i](node, ancestry, options)) {
+                return false;
+              }
+            }
+            return true;
+          };
+        }
+      case 'not':
+        {
+          var _matchers2 = selector.selectors.map(getMatcher);
+          return function (node, ancestry, options) {
+            for (var i = 0; i < _matchers2.length; ++i) {
+              if (_matchers2[i](node, ancestry, options)) {
+                return false;
+              }
+            }
+            return true;
+          };
+        }
+      case 'has':
+        {
+          var _matchers3 = selector.selectors.map(getMatcher);
+          return function (node, ancestry, options) {
+            var result = false;
+            var a = [];
+            estraverse.traverse(node, {
+              enter: function enter(node, parent) {
+                if (parent != null) {
+                  a.unshift(parent);
+                }
+                for (var i = 0; i < _matchers3.length; ++i) {
+                  if (_matchers3[i](node, a, options)) {
+                    result = true;
+                    this["break"]();
+                    return;
+                  }
+                }
+              },
+              leave: function leave() {
+                a.shift();
+              },
+              keys: options && options.visitorKeys,
+              fallback: options && options.fallback || 'iteration'
+            });
+            return result;
+          };
+        }
+      case 'child':
+        {
+          var left = getMatcher(selector.left);
+          var right = getMatcher(selector.right);
+          return function (node, ancestry, options) {
+            if (ancestry.length > 0 && right(node, ancestry, options)) {
+              return left(ancestry[0], ancestry.slice(1), options);
+            }
+            return false;
+          };
+        }
+      case 'descendant':
+        {
+          var _left = getMatcher(selector.left);
+          var _right = getMatcher(selector.right);
+          return function (node, ancestry, options) {
+            if (_right(node, ancestry, options)) {
+              for (var i = 0, l = ancestry.length; i < l; ++i) {
+                if (_left(ancestry[i], ancestry.slice(i + 1), options)) {
+                  return true;
+                }
+              }
+            }
+            return false;
+          };
+        }
+      case 'attribute':
+        {
+          var _path = selector.name.split('.');
+          switch (selector.operator) {
+            case void 0:
+              return function (node) {
+                return getPath(node, _path) != null;
+              };
+            case '=':
+              switch (selector.value.type) {
+                case 'regexp':
+                  return function (node) {
+                    var p = getPath(node, _path);
+                    return typeof p === 'string' && selector.value.value.test(p);
+                  };
+                case 'literal':
+                  {
+                    var literal = "".concat(selector.value.value);
+                    return function (node) {
+                      return literal === "".concat(getPath(node, _path));
+                    };
+                  }
+                case 'type':
+                  return function (node) {
+                    return selector.value.value === _typeof(getPath(node, _path));
+                  };
+              }
+              throw new Error("Unknown selector value type: ".concat(selector.value.type));
+            case '!=':
+              switch (selector.value.type) {
+                case 'regexp':
+                  return function (node) {
+                    return !selector.value.value.test(getPath(node, _path));
+                  };
+                case 'literal':
+                  {
+                    var _literal = "".concat(selector.value.value);
+                    return function (node) {
+                      return _literal !== "".concat(getPath(node, _path));
+                    };
+                  }
+                case 'type':
+                  return function (node) {
+                    return selector.value.value !== _typeof(getPath(node, _path));
+                  };
+              }
+              throw new Error("Unknown selector value type: ".concat(selector.value.type));
+            case '<=':
+              return function (node) {
+                return getPath(node, _path) <= selector.value.value;
+              };
+            case '<':
+              return function (node) {
+                return getPath(node, _path) < selector.value.value;
+              };
+            case '>':
+              return function (node) {
+                return getPath(node, _path) > selector.value.value;
+              };
+            case '>=':
+              return function (node) {
+                return getPath(node, _path) >= selector.value.value;
+              };
+          }
+          throw new Error("Unknown operator: ".concat(selector.operator));
+        }
+      case 'sibling':
+        {
+          var _left2 = getMatcher(selector.left);
+          var _right2 = getMatcher(selector.right);
+          return function (node, ancestry, options) {
+            return _right2(node, ancestry, options) && sibling(node, _left2, ancestry, LEFT_SIDE, options) || selector.left.subject && _left2(node, ancestry, options) && sibling(node, _right2, ancestry, RIGHT_SIDE, options);
+          };
+        }
+      case 'adjacent':
+        {
+          var _left3 = getMatcher(selector.left);
+          var _right3 = getMatcher(selector.right);
+          return function (node, ancestry, options) {
+            return _right3(node, ancestry, options) && adjacent(node, _left3, ancestry, LEFT_SIDE, options) || selector.right.subject && _left3(node, ancestry, options) && adjacent(node, _right3, ancestry, RIGHT_SIDE, options);
+          };
+        }
+      case 'nth-child':
+        {
+          var nth = selector.index.value;
+          var _right4 = getMatcher(selector.right);
+          return function (node, ancestry, options) {
+            return _right4(node, ancestry, options) && nthChild(node, ancestry, nth, options);
+          };
+        }
+      case 'nth-last-child':
+        {
+          var _nth = -selector.index.value;
+          var _right5 = getMatcher(selector.right);
+          return function (node, ancestry, options) {
+            return _right5(node, ancestry, options) && nthChild(node, ancestry, _nth, options);
+          };
+        }
+      case 'class':
+        {
+          var name = selector.name.toLowerCase();
+          return function (node, ancestry, options) {
+            if (options && options.matchClass) {
+              return options.matchClass(selector.name, node, ancestry);
+            }
+            if (options && options.nodeTypeKey) return false;
+            switch (name) {
+              case 'statement':
+                if (node.type.slice(-9) === 'Statement') return true;
+              // fallthrough: interface Declaration <: Statement { }
+              case 'declaration':
+                return node.type.slice(-11) === 'Declaration';
+              case 'pattern':
+                if (node.type.slice(-7) === 'Pattern') return true;
+              // fallthrough: interface Expression <: Node, Pattern { }
+              case 'expression':
+                return node.type.slice(-10) === 'Expression' || node.type.slice(-7) === 'Literal' || node.type === 'Identifier' && (ancestry.length === 0 || ancestry[0].type !== 'MetaProperty') || node.type === 'MetaProperty';
+              case 'function':
+                return node.type === 'FunctionDeclaration' || node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression';
+            }
+            throw new Error("Unknown class name: ".concat(selector.name));
+          };
+        }
+    }
+    throw new Error("Unknown selector type: ".concat(selector.type));
+  }
+
+  /**
+   * @callback TraverseOptionFallback
+   * @param {external:AST} node The given node.
+   * @returns {string[]} An array of visitor keys for the given node.
+   */
+
+  /**
+   * @callback ClassMatcher
+   * @param {string} className The name of the class to match.
+   * @param {external:AST} node The node to match against.
+   * @param {Array<external:AST>} ancestry The ancestry of the node.
+   * @returns {boolean} True if the node matches the class, false if not.
+   */
+
+  /**
+   * @typedef {object} ESQueryOptions
+   * @property {string} [nodeTypeKey="type"] By passing `nodeTypeKey`, we can allow other ASTs to use ESQuery.
+   * @property { { [nodeType: string]: string[] } } [visitorKeys] By passing `visitorKeys` mapping, we can extend the properties of the nodes that traverse the node.
+   * @property {TraverseOptionFallback} [fallback] By passing `fallback` option, we can control the properties of traversing nodes when encountering unknown nodes.
+   * @property {ClassMatcher} [matchClass] By passing `matchClass` option, we can customize the interpretation of classes.
+   */
+
+  /**
+   * Given a `node` and its ancestors, determine if `node` is matched
+   * by `selector`.
+   * @param {?external:AST} node
+   * @param {?SelectorAST} selector
+   * @param {external:AST[]} [ancestry=[]]
+   * @param {ESQueryOptions} [options]
+   * @throws {Error} Unknowns (operator, class name, selector type, or
+   * selector value type)
+   * @returns {boolean}
+   */
+  function matches(node, selector, ancestry, options) {
+    if (!selector) {
+      return true;
+    }
+    if (!node) {
+      return false;
+    }
+    if (!ancestry) {
+      ancestry = [];
+    }
+    return getMatcher(selector)(node, ancestry, options);
+  }
+
+  /**
+   * Get visitor keys of a given node.
+   * @param {external:AST} node The AST node to get keys.
+   * @param {ESQueryOptions|undefined} options
+   * @returns {string[]} Visitor keys of the node.
+   */
+  function getVisitorKeys(node, options) {
+    var nodeTypeKey = options && options.nodeTypeKey || 'type';
+    var nodeType = node[nodeTypeKey];
+    if (options && options.visitorKeys && options.visitorKeys[nodeType]) {
+      return options.visitorKeys[nodeType];
+    }
+    if (estraverse.VisitorKeys[nodeType]) {
+      return estraverse.VisitorKeys[nodeType];
+    }
+    if (options && typeof options.fallback === 'function') {
+      return options.fallback(node);
+    }
+    // 'iteration' fallback
+    return Object.keys(node).filter(function (key) {
+      return key !== nodeTypeKey;
+    });
+  }
+
+  /**
+   * Check whether the given value is an ASTNode or not.
+   * @param {any} node The value to check.
+   * @param {ESQueryOptions|undefined} options The options to use.
+   * @returns {boolean} `true` if the value is an ASTNode.
+   */
+  function isNode(node, options) {
+    var nodeTypeKey = options && options.nodeTypeKey || 'type';
+    return node !== null && _typeof(node) === 'object' && typeof node[nodeTypeKey] === 'string';
+  }
+
+  /**
+   * Determines if the given node has a sibling that matches the
+   * given selector matcher.
+   * @param {external:AST} node
+   * @param {SelectorMatcher} matcher
+   * @param {external:AST[]} ancestry
+   * @param {Side} side
+   * @param {ESQueryOptions|undefined} options
+   * @returns {boolean}
+   */
+  function sibling(node, matcher, ancestry, side, options) {
+    var _ancestry = _slicedToArray(ancestry, 1),
+      parent = _ancestry[0];
+    if (!parent) {
+      return false;
+    }
+    var keys = getVisitorKeys(parent, options);
+    for (var i = 0; i < keys.length; ++i) {
+      var listProp = parent[keys[i]];
+      if (Array.isArray(listProp)) {
+        var startIndex = listProp.indexOf(node);
+        if (startIndex < 0) {
+          continue;
+        }
+        var lowerBound = void 0,
+          upperBound = void 0;
+        if (side === LEFT_SIDE) {
+          lowerBound = 0;
+          upperBound = startIndex;
+        } else {
+          lowerBound = startIndex + 1;
+          upperBound = listProp.length;
+        }
+        for (var k = lowerBound; k < upperBound; ++k) {
+          if (isNode(listProp[k], options) && matcher(listProp[k], ancestry, options)) {
+            return true;
+          }
+        }
+      }
+    }
+    return false;
+  }
+
+  /**
+   * Determines if the given node has an adjacent sibling that matches
+   * the given selector matcher.
+   * @param {external:AST} node
+   * @param {SelectorMatcher} matcher
+   * @param {external:AST[]} ancestry
+   * @param {Side} side
+   * @param {ESQueryOptions|undefined} options
+   * @returns {boolean}
+   */
+  function adjacent(node, matcher, ancestry, side, options) {
+    var _ancestry2 = _slicedToArray(ancestry, 1),
+      parent = _ancestry2[0];
+    if (!parent) {
+      return false;
+    }
+    var keys = getVisitorKeys(parent, options);
+    for (var i = 0; i < keys.length; ++i) {
+      var listProp = parent[keys[i]];
+      if (Array.isArray(listProp)) {
+        var idx = listProp.indexOf(node);
+        if (idx < 0) {
+          continue;
+        }
+        if (side === LEFT_SIDE && idx > 0 && isNode(listProp[idx - 1], options) && matcher(listProp[idx - 1], ancestry, options)) {
+          return true;
+        }
+        if (side === RIGHT_SIDE && idx < listProp.length - 1 && isNode(listProp[idx + 1], options) && matcher(listProp[idx + 1], ancestry, options)) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
+  /**
+   * Determines if the given node is the `nth` child.
+   * If `nth` is negative then the position is counted
+   * from the end of the list of children.
+   * @param {external:AST} node
+   * @param {external:AST[]} ancestry
+   * @param {Integer} nth
+   * @param {ESQueryOptions|undefined} options
+   * @returns {boolean}
+   */
+  function nthChild(node, ancestry, nth, options) {
+    if (nth === 0) {
+      return false;
+    }
+    var _ancestry3 = _slicedToArray(ancestry, 1),
+      parent = _ancestry3[0];
+    if (!parent) {
+      return false;
+    }
+    var keys = getVisitorKeys(parent, options);
+    for (var i = 0; i < keys.length; ++i) {
+      var listProp = parent[keys[i]];
+      if (Array.isArray(listProp)) {
+        var idx = nth < 0 ? listProp.length + nth : nth - 1;
+        if (idx >= 0 && idx < listProp.length && listProp[idx] === node) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
+  /**
+   * For each selector node marked as a subject, find the portion of the
+   * selector that the subject must match.
+   * @param {SelectorAST} selector
+   * @param {SelectorAST} [ancestor] Defaults to `selector`
+   * @returns {SelectorAST[]}
+   */
+  function subjects(selector, ancestor) {
+    if (selector == null || _typeof(selector) != 'object') {
+      return [];
+    }
+    if (ancestor == null) {
+      ancestor = selector;
+    }
+    var results = selector.subject ? [ancestor] : [];
+    var keys = Object.keys(selector);
+    for (var i = 0; i < keys.length; ++i) {
+      var p = keys[i];
+      var sel = selector[p];
+      results.push.apply(results, _toConsumableArray(subjects(sel, p === 'left' ? sel : ancestor)));
+    }
+    return results;
+  }
+
+  /**
+  * @callback TraverseVisitor
+  * @param {?external:AST} node
+  * @param {?external:AST} parent
+  * @param {external:AST[]} ancestry
+  */
+
+  /**
+   * From a JS AST and a selector AST, collect all JS AST nodes that
+   * match the selector.
+   * @param {external:AST} ast
+   * @param {?SelectorAST} selector
+   * @param {TraverseVisitor} visitor
+   * @param {ESQueryOptions} [options]
+   * @returns {external:AST[]}
+   */
+  function traverse(ast, selector, visitor, options) {
+    if (!selector) {
+      return;
+    }
+    var ancestry = [];
+    var matcher = getMatcher(selector);
+    var altSubjects = subjects(selector).map(getMatcher);
+    estraverse.traverse(ast, {
+      enter: function enter(node, parent) {
+        if (parent != null) {
+          ancestry.unshift(parent);
+        }
+        if (matcher(node, ancestry, options)) {
+          if (altSubjects.length) {
+            for (var i = 0, l = altSubjects.length; i < l; ++i) {
+              if (altSubjects[i](node, ancestry, options)) {
+                visitor(node, parent, ancestry);
+              }
+              for (var k = 0, m = ancestry.length; k < m; ++k) {
+                var succeedingAncestry = ancestry.slice(k + 1);
+                if (altSubjects[i](ancestry[k], succeedingAncestry, options)) {
+                  visitor(ancestry[k], parent, succeedingAncestry);
+                }
+              }
+            }
+          } else {
+            visitor(node, parent, ancestry);
+          }
+        }
+      },
+      leave: function leave() {
+        ancestry.shift();
+      },
+      keys: options && options.visitorKeys,
+      fallback: options && options.fallback || 'iteration'
+    });
+  }
+
+  /**
+   * From a JS AST and a selector AST, collect all JS AST nodes that
+   * match the selector.
+   * @param {external:AST} ast
+   * @param {?SelectorAST} selector
+   * @param {ESQueryOptions} [options]
+   * @returns {external:AST[]}
+   */
+  function match(ast, selector, options) {
+    var results = [];
+    traverse(ast, selector, function (node) {
+      results.push(node);
+    }, options);
+    return results;
+  }
+
+  /**
+   * Parse a selector string and return its AST.
+   * @param {string} selector
+   * @returns {SelectorAST}
+   */
+  function parse(selector) {
+    return parser.parse(selector);
+  }
+
+  /**
+   * Query the code AST using the selector string.
+   * @param {external:AST} ast
+   * @param {string} selector
+   * @param {ESQueryOptions} [options]
+   * @returns {external:AST[]}
+   */
+  function query(ast, selector, options) {
+    return match(ast, parse(selector), options);
+  }
+  query.parse = parse;
+  query.match = match;
+  query.traverse = traverse;
+  query.matches = matches;
+  query.query = query;
+
+  return query;
+
+})));
Index: frontend/node_modules/esquery/dist/esquery.lite.min.js
===================================================================
--- frontend/node_modules/esquery/dist/esquery.lite.min.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/dist/esquery.lite.min.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,2 @@
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+//# sourceMappingURL=esquery.lite.min.js.map
Index: frontend/node_modules/esquery/dist/esquery.lite.min.js.map
===================================================================
--- frontend/node_modules/esquery/dist/esquery.lite.min.js.map	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/dist/esquery.lite.min.js.map	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+{"version":3,"file":"esquery.lite.min.js","sources":["../parser.js","../esquery.js"],"sourcesContent":["/*\n * Generated by PEG.js 0.10.0.\n *\n * http://pegjs.org/\n */\n(function(root, factory) {\n  if (typeof define === \"function\" && define.amd) {\n    define([], factory);\n  } else if (typeof module === \"object\" && module.exports) {\n    module.exports = factory();\n  }\n})(this, function() {\n  \"use strict\";\n\n  function peg$subclass(child, parent) {\n    function ctor() { this.constructor = child; }\n    ctor.prototype = parent.prototype;\n    child.prototype = new ctor();\n  }\n\n  function peg$SyntaxError(message, expected, found, location) {\n    this.message  = message;\n    this.expected = expected;\n    this.found    = found;\n    this.location = location;\n    this.name     = \"SyntaxError\";\n\n    if (typeof Error.captureStackTrace === \"function\") {\n      Error.captureStackTrace(this, peg$SyntaxError);\n    }\n  }\n\n  peg$subclass(peg$SyntaxError, Error);\n\n  peg$SyntaxError.buildMessage = function(expected, found) {\n    var DESCRIBE_EXPECTATION_FNS = {\n          literal: function(expectation) {\n            return \"\\\"\" + literalEscape(expectation.text) + \"\\\"\";\n          },\n\n          \"class\": function(expectation) {\n            var escapedParts = \"\",\n                i;\n\n            for (i = 0; i < expectation.parts.length; i++) {\n              escapedParts += expectation.parts[i] instanceof Array\n                ? classEscape(expectation.parts[i][0]) + \"-\" + classEscape(expectation.parts[i][1])\n                : classEscape(expectation.parts[i]);\n            }\n\n            return \"[\" + (expectation.inverted ? \"^\" : \"\") + escapedParts + \"]\";\n          },\n\n          any: function(expectation) {\n            return \"any character\";\n          },\n\n          end: function(expectation) {\n            return \"end of input\";\n          },\n\n          other: function(expectation) {\n            return expectation.description;\n          }\n        };\n\n    function hex(ch) {\n      return ch.charCodeAt(0).toString(16).toUpperCase();\n    }\n\n    function literalEscape(s) {\n      return s\n        .replace(/\\\\/g, '\\\\\\\\')\n        .replace(/\"/g,  '\\\\\"')\n        .replace(/\\0/g, '\\\\0')\n        .replace(/\\t/g, '\\\\t')\n        .replace(/\\n/g, '\\\\n')\n        .replace(/\\r/g, '\\\\r')\n        .replace(/[\\x00-\\x0F]/g,          function(ch) { return '\\\\x0' + hex(ch); })\n        .replace(/[\\x10-\\x1F\\x7F-\\x9F]/g, function(ch) { return '\\\\x'  + hex(ch); });\n    }\n\n    function classEscape(s) {\n      return s\n        .replace(/\\\\/g, '\\\\\\\\')\n        .replace(/\\]/g, '\\\\]')\n        .replace(/\\^/g, '\\\\^')\n        .replace(/-/g,  '\\\\-')\n        .replace(/\\0/g, '\\\\0')\n        .replace(/\\t/g, '\\\\t')\n        .replace(/\\n/g, '\\\\n')\n        .replace(/\\r/g, '\\\\r')\n        .replace(/[\\x00-\\x0F]/g,          function(ch) { return '\\\\x0' + hex(ch); })\n        .replace(/[\\x10-\\x1F\\x7F-\\x9F]/g, function(ch) { return '\\\\x'  + hex(ch); });\n    }\n\n    function describeExpectation(expectation) {\n      return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);\n    }\n\n    function describeExpected(expected) {\n      var descriptions = new Array(expected.length),\n          i, j;\n\n      for (i = 0; i < expected.length; i++) {\n        descriptions[i] = describeExpectation(expected[i]);\n      }\n\n      descriptions.sort();\n\n      if (descriptions.length > 0) {\n        for (i = 1, j = 1; i < descriptions.length; i++) {\n          if (descriptions[i - 1] !== descriptions[i]) {\n            descriptions[j] = descriptions[i];\n            j++;\n          }\n        }\n        descriptions.length = j;\n      }\n\n      switch (descriptions.length) {\n        case 1:\n          return descriptions[0];\n\n        case 2:\n          return descriptions[0] + \" or \" + descriptions[1];\n\n        default:\n          return descriptions.slice(0, -1).join(\", \")\n            + \", or \"\n            + descriptions[descriptions.length - 1];\n      }\n    }\n\n    function describeFound(found) {\n      return found ? \"\\\"\" + literalEscape(found) + \"\\\"\" : \"end of input\";\n    }\n\n    return \"Expected \" + describeExpected(expected) + \" but \" + describeFound(found) + \" found.\";\n  };\n\n  function peg$parse(input, options) {\n    options = options !== void 0 ? options : {};\n\n    var peg$FAILED = {},\n\n        peg$startRuleFunctions = { start: peg$parsestart },\n        peg$startRuleFunction  = peg$parsestart,\n\n        peg$c0 = function(ss) {\n            return ss.length === 1 ? ss[0] : { type: 'matches', selectors: ss };\n          },\n        peg$c1 = function() { return void 0; },\n        peg$c2 = \" \",\n        peg$c3 = peg$literalExpectation(\" \", false),\n        peg$c4 = /^[^ [\\],():#!=><~+.]/,\n        peg$c5 = peg$classExpectation([\" \", \"[\", \"]\", \",\", \"(\", \")\", \":\", \"#\", \"!\", \"=\", \">\", \"<\", \"~\", \"+\", \".\"], true, false),\n        peg$c6 = function(i) { return i.join(''); },\n        peg$c7 = \">\",\n        peg$c8 = peg$literalExpectation(\">\", false),\n        peg$c9 = function() { return 'child'; },\n        peg$c10 = \"~\",\n        peg$c11 = peg$literalExpectation(\"~\", false),\n        peg$c12 = function() { return 'sibling'; },\n        peg$c13 = \"+\",\n        peg$c14 = peg$literalExpectation(\"+\", false),\n        peg$c15 = function() { return 'adjacent'; },\n        peg$c16 = function() { return 'descendant'; },\n        peg$c17 = \",\",\n        peg$c18 = peg$literalExpectation(\",\", false),\n        peg$c19 = function(s, ss) {\n          return [s].concat(ss.map(function (s) { return s[3]; }));\n        },\n        peg$c20 = function(op, s) {\n            if (!op) return s;\n            return { type: op, left: { type: 'exactNode' }, right: s };\n          },\n        peg$c21 = function(a, ops) {\n            return ops.reduce(function (memo, rhs) {\n              return { type: rhs[0], left: memo, right: rhs[1] };\n            }, a);\n          },\n        peg$c22 = \"!\",\n        peg$c23 = peg$literalExpectation(\"!\", false),\n        peg$c24 = function(subject, as) {\n            const b = as.length === 1 ? as[0] : { type: 'compound', selectors: as };\n            if(subject) b.subject = true;\n            return b;\n          },\n        peg$c25 = \"*\",\n        peg$c26 = peg$literalExpectation(\"*\", false),\n        peg$c27 = function(a) { return { type: 'wildcard', value: a }; },\n        peg$c28 = \"#\",\n        peg$c29 = peg$literalExpectation(\"#\", false),\n        peg$c30 = function(i) { return { type: 'identifier', value: i }; },\n        peg$c31 = \"[\",\n        peg$c32 = peg$literalExpectation(\"[\", false),\n        peg$c33 = \"]\",\n        peg$c34 = peg$literalExpectation(\"]\", false),\n        peg$c35 = function(v) { return v; },\n        peg$c36 = /^[><!]/,\n        peg$c37 = peg$classExpectation([\">\", \"<\", \"!\"], false, false),\n        peg$c38 = \"=\",\n        peg$c39 = peg$literalExpectation(\"=\", false),\n        peg$c40 = function(a) { return (a || '') + '='; },\n        peg$c41 = /^[><]/,\n        peg$c42 = peg$classExpectation([\">\", \"<\"], false, false),\n        peg$c43 = \".\",\n        peg$c44 = peg$literalExpectation(\".\", false),\n        peg$c45 = function(a, as) {\n            return [].concat.apply([a], as).join('');\n          },\n        peg$c46 = function(name, op, value) {\n              return { type: 'attribute', name: name, operator: op, value: value };\n            },\n        peg$c47 = function(name) { return { type: 'attribute', name: name }; },\n        peg$c48 = \"\\\"\",\n        peg$c49 = peg$literalExpectation(\"\\\"\", false),\n        peg$c50 = /^[^\\\\\"]/,\n        peg$c51 = peg$classExpectation([\"\\\\\", \"\\\"\"], true, false),\n        peg$c52 = \"\\\\\",\n        peg$c53 = peg$literalExpectation(\"\\\\\", false),\n        peg$c54 = peg$anyExpectation(),\n        peg$c55 = function(a, b) { return a + b; },\n        peg$c56 = function(d) {\n                return { type: 'literal', value: strUnescape(d.join('')) };\n              },\n        peg$c57 = \"'\",\n        peg$c58 = peg$literalExpectation(\"'\", false),\n        peg$c59 = /^[^\\\\']/,\n        peg$c60 = peg$classExpectation([\"\\\\\", \"'\"], true, false),\n        peg$c61 = /^[0-9]/,\n        peg$c62 = peg$classExpectation([[\"0\", \"9\"]], false, false),\n        peg$c63 = function(a, b) {\n                // Can use `a.flat().join('')` once supported\n                const leadingDecimals = a ? [].concat.apply([], a).join('') : '';\n                return { type: 'literal', value: parseFloat(leadingDecimals + b.join('')) };\n              },\n        peg$c64 = function(i) { return { type: 'literal', value: i }; },\n        peg$c65 = \"type(\",\n        peg$c66 = peg$literalExpectation(\"type(\", false),\n        peg$c67 = /^[^ )]/,\n        peg$c68 = peg$classExpectation([\" \", \")\"], true, false),\n        peg$c69 = \")\",\n        peg$c70 = peg$literalExpectation(\")\", false),\n        peg$c71 = function(t) { return { type: 'type', value: t.join('') }; },\n        peg$c72 = /^[imsu]/,\n        peg$c73 = peg$classExpectation([\"i\", \"m\", \"s\", \"u\"], false, false),\n        peg$c74 = \"/\",\n        peg$c75 = peg$literalExpectation(\"/\", false),\n        peg$c76 = function(pattern, flgs) {\n              return {\n                type: 'regexp', value: new RegExp(pattern.join(''), flgs ? flgs.join('') : '')\n              };\n            },\n        peg$c77 = /^[^\\]\\\\]/,\n        peg$c78 = peg$classExpectation([\"]\", \"\\\\\"], true, false),\n        peg$c79 = function(cs) { return '[' + cs.join('') + ']'; },\n        peg$c80 = function(a) { return '\\\\' + a; },\n        peg$c81 = /^[^\\/\\\\[]/,\n        peg$c82 = peg$classExpectation([\"/\", \"\\\\\", \"[\"], true, false),\n        peg$c83 = function(cs) { return cs.join(''); },\n        peg$c84 = function(i, is) {\n          return { type: 'field', name: is.reduce(function(memo, p){ return memo + p[0] + p[1]; }, i)};\n        },\n        peg$c85 = \":not(\",\n        peg$c86 = peg$literalExpectation(\":not(\", false),\n        peg$c87 = function(ss) { return { type: 'not', selectors: ss }; },\n        peg$c88 = \":matches(\",\n        peg$c89 = peg$literalExpectation(\":matches(\", false),\n        peg$c90 = function(ss) { return { type: 'matches', selectors: ss }; },\n        peg$c91 = \":is(\",\n        peg$c92 = peg$literalExpectation(\":is(\", false),\n        peg$c93 = \":has(\",\n        peg$c94 = peg$literalExpectation(\":has(\", false),\n        peg$c95 = function(ss) { return { type: 'has', selectors: ss }; },\n        peg$c96 = \":first-child\",\n        peg$c97 = peg$literalExpectation(\":first-child\", false),\n        peg$c98 = function() { return nth(1); },\n        peg$c99 = \":last-child\",\n        peg$c100 = peg$literalExpectation(\":last-child\", false),\n        peg$c101 = function() { return nthLast(1); },\n        peg$c102 = \":nth-child(\",\n        peg$c103 = peg$literalExpectation(\":nth-child(\", false),\n        peg$c104 = function(n) { return nth(parseInt(n.join(''), 10)); },\n        peg$c105 = \":nth-last-child(\",\n        peg$c106 = peg$literalExpectation(\":nth-last-child(\", false),\n        peg$c107 = function(n) { return nthLast(parseInt(n.join(''), 10)); },\n        peg$c108 = \":\",\n        peg$c109 = peg$literalExpectation(\":\", false),\n        peg$c110 = function(c) {\n          return { type: 'class', name: c };\n        },\n\n        peg$currPos          = 0,\n        peg$savedPos         = 0,\n        peg$posDetailsCache  = [{ line: 1, column: 1 }],\n        peg$maxFailPos       = 0,\n        peg$maxFailExpected  = [],\n        peg$silentFails      = 0,\n\n        peg$resultsCache = {},\n\n        peg$result;\n\n    if (\"startRule\" in options) {\n      if (!(options.startRule in peg$startRuleFunctions)) {\n        throw new Error(\"Can't start parsing from rule \\\"\" + options.startRule + \"\\\".\");\n      }\n\n      peg$startRuleFunction = peg$startRuleFunctions[options.startRule];\n    }\n\n    function text() {\n      return input.substring(peg$savedPos, peg$currPos);\n    }\n\n    function location() {\n      return peg$computeLocation(peg$savedPos, peg$currPos);\n    }\n\n    function expected(description, location) {\n      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)\n\n      throw peg$buildStructuredError(\n        [peg$otherExpectation(description)],\n        input.substring(peg$savedPos, peg$currPos),\n        location\n      );\n    }\n\n    function error(message, location) {\n      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)\n\n      throw peg$buildSimpleError(message, location);\n    }\n\n    function peg$literalExpectation(text, ignoreCase) {\n      return { type: \"literal\", text: text, ignoreCase: ignoreCase };\n    }\n\n    function peg$classExpectation(parts, inverted, ignoreCase) {\n      return { type: \"class\", parts: parts, inverted: inverted, ignoreCase: ignoreCase };\n    }\n\n    function peg$anyExpectation() {\n      return { type: \"any\" };\n    }\n\n    function peg$endExpectation() {\n      return { type: \"end\" };\n    }\n\n    function peg$otherExpectation(description) {\n      return { type: \"other\", description: description };\n    }\n\n    function peg$computePosDetails(pos) {\n      var details = peg$posDetailsCache[pos], p;\n\n      if (details) {\n        return details;\n      } else {\n        p = pos - 1;\n        while (!peg$posDetailsCache[p]) {\n          p--;\n        }\n\n        details = peg$posDetailsCache[p];\n        details = {\n          line:   details.line,\n          column: details.column\n        };\n\n        while (p < pos) {\n          if (input.charCodeAt(p) === 10) {\n            details.line++;\n            details.column = 1;\n          } else {\n            details.column++;\n          }\n\n          p++;\n        }\n\n        peg$posDetailsCache[pos] = details;\n        return details;\n      }\n    }\n\n    function peg$computeLocation(startPos, endPos) {\n      var startPosDetails = peg$computePosDetails(startPos),\n          endPosDetails   = peg$computePosDetails(endPos);\n\n      return {\n        start: {\n          offset: startPos,\n          line:   startPosDetails.line,\n          column: startPosDetails.column\n        },\n        end: {\n          offset: endPos,\n          line:   endPosDetails.line,\n          column: endPosDetails.column\n        }\n      };\n    }\n\n    function peg$fail(expected) {\n      if (peg$currPos < peg$maxFailPos) { return; }\n\n      if (peg$currPos > peg$maxFailPos) {\n        peg$maxFailPos = peg$currPos;\n        peg$maxFailExpected = [];\n      }\n\n      peg$maxFailExpected.push(expected);\n    }\n\n    function peg$buildSimpleError(message, location) {\n      return new peg$SyntaxError(message, null, null, location);\n    }\n\n    function peg$buildStructuredError(expected, found, location) {\n      return new peg$SyntaxError(\n        peg$SyntaxError.buildMessage(expected, found),\n        expected,\n        found,\n        location\n      );\n    }\n\n    function peg$parsestart() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 0,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parse_();\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseselectors();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parse_();\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c0(s2);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        s1 = peg$parse_();\n        if (s1 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c1();\n        }\n        s0 = s1;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parse_() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 1,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = [];\n      if (input.charCodeAt(peg$currPos) === 32) {\n        s1 = peg$c2;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c3); }\n      }\n      while (s1 !== peg$FAILED) {\n        s0.push(s1);\n        if (input.charCodeAt(peg$currPos) === 32) {\n          s1 = peg$c2;\n          peg$currPos++;\n        } else {\n          s1 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c3); }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseidentifierName() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 2,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = [];\n      if (peg$c4.test(input.charAt(peg$currPos))) {\n        s2 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s2 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c5); }\n      }\n      if (s2 !== peg$FAILED) {\n        while (s2 !== peg$FAILED) {\n          s1.push(s2);\n          if (peg$c4.test(input.charAt(peg$currPos))) {\n            s2 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s2 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c5); }\n          }\n        }\n      } else {\n        s1 = peg$FAILED;\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c6(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsebinaryOp() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 3,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parse_();\n      if (s1 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 62) {\n          s2 = peg$c7;\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c8); }\n        }\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parse_();\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c9();\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        s1 = peg$parse_();\n        if (s1 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 126) {\n            s2 = peg$c10;\n            peg$currPos++;\n          } else {\n            s2 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c11); }\n          }\n          if (s2 !== peg$FAILED) {\n            s3 = peg$parse_();\n            if (s3 !== peg$FAILED) {\n              peg$savedPos = s0;\n              s1 = peg$c12();\n              s0 = s1;\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n        if (s0 === peg$FAILED) {\n          s0 = peg$currPos;\n          s1 = peg$parse_();\n          if (s1 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 43) {\n              s2 = peg$c13;\n              peg$currPos++;\n            } else {\n              s2 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c14); }\n            }\n            if (s2 !== peg$FAILED) {\n              s3 = peg$parse_();\n              if (s3 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c15();\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n          if (s0 === peg$FAILED) {\n            s0 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 32) {\n              s1 = peg$c2;\n              peg$currPos++;\n            } else {\n              s1 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c3); }\n            }\n            if (s1 !== peg$FAILED) {\n              s2 = peg$parse_();\n              if (s2 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c16();\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsehasSelectors() {\n      var s0, s1, s2, s3, s4, s5, s6, s7;\n\n      var key    = peg$currPos * 36 + 4,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parsehasSelector();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        s4 = peg$parse_();\n        if (s4 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 44) {\n            s5 = peg$c17;\n            peg$currPos++;\n          } else {\n            s5 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c18); }\n          }\n          if (s5 !== peg$FAILED) {\n            s6 = peg$parse_();\n            if (s6 !== peg$FAILED) {\n              s7 = peg$parsehasSelector();\n              if (s7 !== peg$FAILED) {\n                s4 = [s4, s5, s6, s7];\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          s4 = peg$parse_();\n          if (s4 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 44) {\n              s5 = peg$c17;\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c18); }\n            }\n            if (s5 !== peg$FAILED) {\n              s6 = peg$parse_();\n              if (s6 !== peg$FAILED) {\n                s7 = peg$parsehasSelector();\n                if (s7 !== peg$FAILED) {\n                  s4 = [s4, s5, s6, s7];\n                  s3 = s4;\n                } else {\n                  peg$currPos = s3;\n                  s3 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c19(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseselectors() {\n      var s0, s1, s2, s3, s4, s5, s6, s7;\n\n      var key    = peg$currPos * 36 + 5,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseselector();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        s4 = peg$parse_();\n        if (s4 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 44) {\n            s5 = peg$c17;\n            peg$currPos++;\n          } else {\n            s5 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c18); }\n          }\n          if (s5 !== peg$FAILED) {\n            s6 = peg$parse_();\n            if (s6 !== peg$FAILED) {\n              s7 = peg$parseselector();\n              if (s7 !== peg$FAILED) {\n                s4 = [s4, s5, s6, s7];\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          s4 = peg$parse_();\n          if (s4 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 44) {\n              s5 = peg$c17;\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c18); }\n            }\n            if (s5 !== peg$FAILED) {\n              s6 = peg$parse_();\n              if (s6 !== peg$FAILED) {\n                s7 = peg$parseselector();\n                if (s7 !== peg$FAILED) {\n                  s4 = [s4, s5, s6, s7];\n                  s3 = s4;\n                } else {\n                  peg$currPos = s3;\n                  s3 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c19(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsehasSelector() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 6,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parsebinaryOp();\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseselector();\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c20(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseselector() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 7,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parsesequence();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        s4 = peg$parsebinaryOp();\n        if (s4 !== peg$FAILED) {\n          s5 = peg$parsesequence();\n          if (s5 !== peg$FAILED) {\n            s4 = [s4, s5];\n            s3 = s4;\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          s4 = peg$parsebinaryOp();\n          if (s4 !== peg$FAILED) {\n            s5 = peg$parsesequence();\n            if (s5 !== peg$FAILED) {\n              s4 = [s4, s5];\n              s3 = s4;\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c21(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsesequence() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 8,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 33) {\n        s1 = peg$c22;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c23); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$parseatom();\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            s3 = peg$parseatom();\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c24(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseatom() {\n      var s0;\n\n      var key    = peg$currPos * 36 + 9,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$parsewildcard();\n      if (s0 === peg$FAILED) {\n        s0 = peg$parseidentifier();\n        if (s0 === peg$FAILED) {\n          s0 = peg$parseattr();\n          if (s0 === peg$FAILED) {\n            s0 = peg$parsefield();\n            if (s0 === peg$FAILED) {\n              s0 = peg$parsenegation();\n              if (s0 === peg$FAILED) {\n                s0 = peg$parsematches();\n                if (s0 === peg$FAILED) {\n                  s0 = peg$parseis();\n                  if (s0 === peg$FAILED) {\n                    s0 = peg$parsehas();\n                    if (s0 === peg$FAILED) {\n                      s0 = peg$parsefirstChild();\n                      if (s0 === peg$FAILED) {\n                        s0 = peg$parselastChild();\n                        if (s0 === peg$FAILED) {\n                          s0 = peg$parsenthChild();\n                          if (s0 === peg$FAILED) {\n                            s0 = peg$parsenthLastChild();\n                            if (s0 === peg$FAILED) {\n                              s0 = peg$parseclass();\n                            }\n                          }\n                        }\n                      }\n                    }\n                  }\n                }\n              }\n            }\n          }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsewildcard() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 10,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 42) {\n        s1 = peg$c25;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c26); }\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c27(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseidentifier() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 11,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 35) {\n        s1 = peg$c28;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c29); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseidentifierName();\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c30(s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattr() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 12,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 91) {\n        s1 = peg$c31;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c32); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseattrValue();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 93) {\n                s5 = peg$c33;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c34); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c35(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrOps() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 13,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (peg$c36.test(input.charAt(peg$currPos))) {\n        s1 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c37); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 61) {\n          s2 = peg$c38;\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c39); }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c40(s1);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        if (peg$c41.test(input.charAt(peg$currPos))) {\n          s0 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s0 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c42); }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrEqOps() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 14,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 33) {\n        s1 = peg$c22;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c23); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 61) {\n          s2 = peg$c38;\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c39); }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c40(s1);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrName() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 15,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseidentifierName();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        if (input.charCodeAt(peg$currPos) === 46) {\n          s4 = peg$c43;\n          peg$currPos++;\n        } else {\n          s4 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c44); }\n        }\n        if (s4 !== peg$FAILED) {\n          s5 = peg$parseidentifierName();\n          if (s5 !== peg$FAILED) {\n            s4 = [s4, s5];\n            s3 = s4;\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          if (input.charCodeAt(peg$currPos) === 46) {\n            s4 = peg$c43;\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c44); }\n          }\n          if (s4 !== peg$FAILED) {\n            s5 = peg$parseidentifierName();\n            if (s5 !== peg$FAILED) {\n              s4 = [s4, s5];\n              s3 = s4;\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c45(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrValue() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 16,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseattrName();\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseattrEqOps();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              s5 = peg$parsetype();\n              if (s5 === peg$FAILED) {\n                s5 = peg$parseregex();\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c46(s1, s3, s5);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        s1 = peg$parseattrName();\n        if (s1 !== peg$FAILED) {\n          s2 = peg$parse_();\n          if (s2 !== peg$FAILED) {\n            s3 = peg$parseattrOps();\n            if (s3 !== peg$FAILED) {\n              s4 = peg$parse_();\n              if (s4 !== peg$FAILED) {\n                s5 = peg$parsestring();\n                if (s5 === peg$FAILED) {\n                  s5 = peg$parsenumber();\n                  if (s5 === peg$FAILED) {\n                    s5 = peg$parsepath();\n                  }\n                }\n                if (s5 !== peg$FAILED) {\n                  peg$savedPos = s0;\n                  s1 = peg$c46(s1, s3, s5);\n                  s0 = s1;\n                } else {\n                  peg$currPos = s0;\n                  s0 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n        if (s0 === peg$FAILED) {\n          s0 = peg$currPos;\n          s1 = peg$parseattrName();\n          if (s1 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c47(s1);\n          }\n          s0 = s1;\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsestring() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 17,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 34) {\n        s1 = peg$c48;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c49); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        if (peg$c50.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c51); }\n        }\n        if (s3 === peg$FAILED) {\n          s3 = peg$currPos;\n          if (input.charCodeAt(peg$currPos) === 92) {\n            s4 = peg$c52;\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c53); }\n          }\n          if (s4 !== peg$FAILED) {\n            if (input.length > peg$currPos) {\n              s5 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c54); }\n            }\n            if (s5 !== peg$FAILED) {\n              peg$savedPos = s3;\n              s4 = peg$c55(s4, s5);\n              s3 = s4;\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          if (peg$c50.test(input.charAt(peg$currPos))) {\n            s3 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c51); }\n          }\n          if (s3 === peg$FAILED) {\n            s3 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 92) {\n              s4 = peg$c52;\n              peg$currPos++;\n            } else {\n              s4 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c53); }\n            }\n            if (s4 !== peg$FAILED) {\n              if (input.length > peg$currPos) {\n                s5 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c54); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s3;\n                s4 = peg$c55(s4, s5);\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 34) {\n            s3 = peg$c48;\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c49); }\n          }\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c56(s2);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        if (input.charCodeAt(peg$currPos) === 39) {\n          s1 = peg$c57;\n          peg$currPos++;\n        } else {\n          s1 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c58); }\n        }\n        if (s1 !== peg$FAILED) {\n          s2 = [];\n          if (peg$c59.test(input.charAt(peg$currPos))) {\n            s3 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c60); }\n          }\n          if (s3 === peg$FAILED) {\n            s3 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 92) {\n              s4 = peg$c52;\n              peg$currPos++;\n            } else {\n              s4 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c53); }\n            }\n            if (s4 !== peg$FAILED) {\n              if (input.length > peg$currPos) {\n                s5 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c54); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s3;\n                s4 = peg$c55(s4, s5);\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          }\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            if (peg$c59.test(input.charAt(peg$currPos))) {\n              s3 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c60); }\n            }\n            if (s3 === peg$FAILED) {\n              s3 = peg$currPos;\n              if (input.charCodeAt(peg$currPos) === 92) {\n                s4 = peg$c52;\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c53); }\n              }\n              if (s4 !== peg$FAILED) {\n                if (input.length > peg$currPos) {\n                  s5 = input.charAt(peg$currPos);\n                  peg$currPos++;\n                } else {\n                  s5 = peg$FAILED;\n                  if (peg$silentFails === 0) { peg$fail(peg$c54); }\n                }\n                if (s5 !== peg$FAILED) {\n                  peg$savedPos = s3;\n                  s4 = peg$c55(s4, s5);\n                  s3 = s4;\n                } else {\n                  peg$currPos = s3;\n                  s3 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            }\n          }\n          if (s2 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 39) {\n              s3 = peg$c57;\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c58); }\n            }\n            if (s3 !== peg$FAILED) {\n              peg$savedPos = s0;\n              s1 = peg$c56(s2);\n              s0 = s1;\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenumber() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 18,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$currPos;\n      s2 = [];\n      if (peg$c61.test(input.charAt(peg$currPos))) {\n        s3 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s3 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c62); }\n      }\n      while (s3 !== peg$FAILED) {\n        s2.push(s3);\n        if (peg$c61.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c62); }\n        }\n      }\n      if (s2 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 46) {\n          s3 = peg$c43;\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c44); }\n        }\n        if (s3 !== peg$FAILED) {\n          s2 = [s2, s3];\n          s1 = s2;\n        } else {\n          peg$currPos = s1;\n          s1 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s1;\n        s1 = peg$FAILED;\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        if (peg$c61.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c62); }\n        }\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            if (peg$c61.test(input.charAt(peg$currPos))) {\n              s3 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c62); }\n            }\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c63(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsepath() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 19,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseidentifierName();\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c64(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsetype() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 20,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 5) === peg$c65) {\n        s1 = peg$c65;\n        peg$currPos += 5;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c66); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          if (peg$c67.test(input.charAt(peg$currPos))) {\n            s4 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c68); }\n          }\n          if (s4 !== peg$FAILED) {\n            while (s4 !== peg$FAILED) {\n              s3.push(s4);\n              if (peg$c67.test(input.charAt(peg$currPos))) {\n                s4 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c68); }\n              }\n            }\n          } else {\n            s3 = peg$FAILED;\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c71(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseflags() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 21,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = [];\n      if (peg$c72.test(input.charAt(peg$currPos))) {\n        s1 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c73); }\n      }\n      if (s1 !== peg$FAILED) {\n        while (s1 !== peg$FAILED) {\n          s0.push(s1);\n          if (peg$c72.test(input.charAt(peg$currPos))) {\n            s1 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s1 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c73); }\n          }\n        }\n      } else {\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseregex() {\n      var s0, s1, s2, s3, s4;\n\n      var key    = peg$currPos * 36 + 22,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 47) {\n        s1 = peg$c74;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c75); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$parsere_character_class();\n        if (s3 === peg$FAILED) {\n          s3 = peg$parsere_escape();\n          if (s3 === peg$FAILED) {\n            s3 = peg$parsere_chars();\n          }\n        }\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            s3 = peg$parsere_character_class();\n            if (s3 === peg$FAILED) {\n              s3 = peg$parsere_escape();\n              if (s3 === peg$FAILED) {\n                s3 = peg$parsere_chars();\n              }\n            }\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 47) {\n            s3 = peg$c74;\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c75); }\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parseflags();\n            if (s4 === peg$FAILED) {\n              s4 = null;\n            }\n            if (s4 !== peg$FAILED) {\n              peg$savedPos = s0;\n              s1 = peg$c76(s2, s4);\n              s0 = s1;\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsere_character_class() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 23,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 91) {\n        s1 = peg$c31;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c32); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        if (peg$c77.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c78); }\n        }\n        if (s3 === peg$FAILED) {\n          s3 = peg$parsere_escape();\n        }\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            if (peg$c77.test(input.charAt(peg$currPos))) {\n              s3 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c78); }\n            }\n            if (s3 === peg$FAILED) {\n              s3 = peg$parsere_escape();\n            }\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 93) {\n            s3 = peg$c33;\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c34); }\n          }\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c79(s2);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsere_escape() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 24,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 92) {\n        s1 = peg$c52;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c53); }\n      }\n      if (s1 !== peg$FAILED) {\n        if (input.length > peg$currPos) {\n          s2 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c54); }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c80(s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsere_chars() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 25,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = [];\n      if (peg$c81.test(input.charAt(peg$currPos))) {\n        s2 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s2 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c82); }\n      }\n      if (s2 !== peg$FAILED) {\n        while (s2 !== peg$FAILED) {\n          s1.push(s2);\n          if (peg$c81.test(input.charAt(peg$currPos))) {\n            s2 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s2 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c82); }\n          }\n        }\n      } else {\n        s1 = peg$FAILED;\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c83(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsefield() {\n      var s0, s1, s2, s3, s4, s5, s6;\n\n      var key    = peg$currPos * 36 + 26,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 46) {\n        s1 = peg$c43;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c44); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseidentifierName();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          s4 = peg$currPos;\n          if (input.charCodeAt(peg$currPos) === 46) {\n            s5 = peg$c43;\n            peg$currPos++;\n          } else {\n            s5 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c44); }\n          }\n          if (s5 !== peg$FAILED) {\n            s6 = peg$parseidentifierName();\n            if (s6 !== peg$FAILED) {\n              s5 = [s5, s6];\n              s4 = s5;\n            } else {\n              peg$currPos = s4;\n              s4 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s4;\n            s4 = peg$FAILED;\n          }\n          while (s4 !== peg$FAILED) {\n            s3.push(s4);\n            s4 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 46) {\n              s5 = peg$c43;\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c44); }\n            }\n            if (s5 !== peg$FAILED) {\n              s6 = peg$parseidentifierName();\n              if (s6 !== peg$FAILED) {\n                s5 = [s5, s6];\n                s4 = s5;\n              } else {\n                peg$currPos = s4;\n                s4 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s4;\n              s4 = peg$FAILED;\n            }\n          }\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c84(s2, s3);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenegation() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 27,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 5) === peg$c85) {\n        s1 = peg$c85;\n        peg$currPos += 5;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c86); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseselectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c87(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsematches() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 28,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 9) === peg$c88) {\n        s1 = peg$c88;\n        peg$currPos += 9;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c89); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseselectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c90(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseis() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 29,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 4) === peg$c91) {\n        s1 = peg$c91;\n        peg$currPos += 4;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c92); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseselectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c90(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsehas() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 30,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 5) === peg$c93) {\n        s1 = peg$c93;\n        peg$currPos += 5;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c94); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parsehasSelectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c95(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsefirstChild() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 31,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 12) === peg$c96) {\n        s1 = peg$c96;\n        peg$currPos += 12;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c97); }\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c98();\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parselastChild() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 32,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 11) === peg$c99) {\n        s1 = peg$c99;\n        peg$currPos += 11;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c100); }\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c101();\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenthChild() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 33,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 11) === peg$c102) {\n        s1 = peg$c102;\n        peg$currPos += 11;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c103); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          if (peg$c61.test(input.charAt(peg$currPos))) {\n            s4 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c62); }\n          }\n          if (s4 !== peg$FAILED) {\n            while (s4 !== peg$FAILED) {\n              s3.push(s4);\n              if (peg$c61.test(input.charAt(peg$currPos))) {\n                s4 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c62); }\n              }\n            }\n          } else {\n            s3 = peg$FAILED;\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c104(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenthLastChild() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 34,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 16) === peg$c105) {\n        s1 = peg$c105;\n        peg$currPos += 16;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c106); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          if (peg$c61.test(input.charAt(peg$currPos))) {\n            s4 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c62); }\n          }\n          if (s4 !== peg$FAILED) {\n            while (s4 !== peg$FAILED) {\n              s3.push(s4);\n              if (peg$c61.test(input.charAt(peg$currPos))) {\n                s4 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c62); }\n              }\n            }\n          } else {\n            s3 = peg$FAILED;\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c107(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseclass() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 35,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 58) {\n        s1 = peg$c108;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c109); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseidentifierName();\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c110(s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n\n      function nth(n) { return { type: 'nth-child', index: { type: 'literal', value: n } }; }\n      function nthLast(n) { return { type: 'nth-last-child', index: { type: 'literal', value: n } }; }\n      function strUnescape(s) {\n        return s.replace(/\\\\(.)/g, function(match, ch) {\n          switch(ch) {\n            case 'b': return '\\b';\n            case 'f': return '\\f';\n            case 'n': return '\\n';\n            case 'r': return '\\r';\n            case 't': return '\\t';\n            case 'v': return '\\v';\n            default: return ch;\n          }\n        });\n      }\n\n\n    peg$result = peg$startRuleFunction();\n\n    if (peg$result !== peg$FAILED && peg$currPos === input.length) {\n      return peg$result;\n    } else {\n      if (peg$result !== peg$FAILED && peg$currPos < input.length) {\n        peg$fail(peg$endExpectation());\n      }\n\n      throw peg$buildStructuredError(\n        peg$maxFailExpected,\n        peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,\n        peg$maxFailPos < input.length\n          ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)\n          : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)\n      );\n    }\n  }\n\n  return {\n    SyntaxError: peg$SyntaxError,\n    parse:       peg$parse\n  };\n});\n","/* vim: set sw=4 sts=4 : */\nimport estraverse from 'estraverse';\nimport parser from './parser.js';\n\n/**\n* @typedef {\"LEFT_SIDE\"|\"RIGHT_SIDE\"} Side\n*/\n\nconst LEFT_SIDE = 'LEFT_SIDE';\nconst RIGHT_SIDE = 'RIGHT_SIDE';\n\n/**\n * @external AST\n * @see https://esprima.readthedocs.io/en/latest/syntax-tree-format.html\n */\n\n/**\n * One of the rules of `grammar.pegjs`\n * @typedef {PlainObject} SelectorAST\n * @see grammar.pegjs\n*/\n\n/**\n * The `sequence` production of `grammar.pegjs`\n * @typedef {PlainObject} SelectorSequenceAST\n*/\n\n/**\n * Get the value of a property which may be multiple levels down\n * in the object.\n * @param {?PlainObject} obj\n * @param {string[]} keys\n * @returns {undefined|boolean|string|number|external:AST}\n */\nfunction getPath(obj, keys) {\n    for (let i = 0; i < keys.length; ++i) {\n        if (obj == null) { return obj; }\n        obj = obj[keys[i]];\n    }\n    return obj;\n}\n\n/**\n * Determine whether `node` can be reached by following `path`,\n * starting at `ancestor`.\n * @param {?external:AST} node\n * @param {?external:AST} ancestor\n * @param {string[]} path\n * @param {Integer} fromPathIndex\n * @returns {boolean}\n */\nfunction inPath(node, ancestor, path, fromPathIndex) {\n    let current = ancestor;\n    for (let i = fromPathIndex; i < path.length; ++i) {\n        if (current == null) {\n            return false;\n        }\n        const field = current[path[i]];\n        if (Array.isArray(field)) {\n            for (let k = 0; k < field.length; ++k) {\n                if (inPath(node, field[k], path, i + 1)) {\n                    return true;\n                }\n            }\n            return false;\n        }\n        current = field;\n    }\n    return node === current;\n}\n\n/**\n * A generated matcher function for a selector.\n * @callback SelectorMatcher\n * @param {?SelectorAST} selector\n * @param {external:AST[]} [ancestry=[]]\n * @param {ESQueryOptions} [options]\n * @returns {void}\n*/\n\n/**\n * A WeakMap for holding cached matcher functions for selectors.\n * @type {WeakMap<SelectorAST, SelectorMatcher>}\n*/\nconst MATCHER_CACHE = typeof WeakMap === 'function' ? new WeakMap : null;\n\n/**\n * Look up a matcher function for `selector` in the cache.\n * If it does not exist, generate it with `generateMatcher` and add it to the cache.\n * In engines without WeakMap, the caching is skipped and matchers are generated with every call.\n * @param {?SelectorAST} selector\n * @returns {SelectorMatcher}\n */\nfunction getMatcher(selector) {\n    if (selector == null) {\n        return () => true;\n    }\n\n    if (MATCHER_CACHE != null) {\n        let matcher = MATCHER_CACHE.get(selector);\n        if (matcher != null) {\n            return matcher;\n        }\n        matcher = generateMatcher(selector);\n        MATCHER_CACHE.set(selector, matcher);\n        return matcher;\n    }\n\n    return generateMatcher(selector);\n}\n\n/**\n * Create a matcher function for `selector`,\n * @param {?SelectorAST} selector\n * @returns {SelectorMatcher}\n */\nfunction generateMatcher(selector) {\n    switch(selector.type) {\n        case 'wildcard':\n            return () => true;\n\n        case 'identifier': {\n            const value = selector.value.toLowerCase();\n            return (node, ancestry, options) => {\n                const nodeTypeKey = (options && options.nodeTypeKey) || 'type';\n                return value === node[nodeTypeKey].toLowerCase();\n            };\n        }\n\n        case 'exactNode':\n            return (node, ancestry) => {\n                return ancestry.length === 0;\n            };\n\n        case 'field': {\n            const path = selector.name.split('.');\n            return (node, ancestry) => {\n                const ancestor = ancestry[path.length - 1];\n                return inPath(node, ancestor, path, 0);\n            };\n        }\n\n        case 'matches': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                for (let i = 0; i < matchers.length; ++i) {\n                    if (matchers[i](node, ancestry, options)) { return true; }\n                }\n                return false;\n            };\n        }\n\n        case 'compound': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                for (let i = 0; i < matchers.length; ++i) {\n                    if (!matchers[i](node, ancestry, options)) { return false; }\n                }\n                return true;\n            };\n        }\n\n        case 'not': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                for (let i = 0; i < matchers.length; ++i) {\n                    if (matchers[i](node, ancestry, options)) { return false; }\n                }\n                return true;\n            };\n        }\n\n        case 'has': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                let result = false;\n\n                const a = [];\n                estraverse.traverse(node, {\n                    enter (node, parent) {\n                        if (parent != null) { a.unshift(parent); }\n\n                        for (let i = 0; i < matchers.length; ++i) {\n                            if (matchers[i](node, a, options)) {\n                                result = true;\n                                this.break();\n                                return;\n                            }\n                        }\n                    },\n                    leave () { a.shift(); },\n                    keys: options && options.visitorKeys,\n                    fallback: options && options.fallback || 'iteration'\n                });\n\n                return result;\n            };\n        }\n\n        case 'child': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) => {\n                if (ancestry.length > 0 && right(node, ancestry, options)) {\n                    return left(ancestry[0], ancestry.slice(1), options);\n                }\n                return false;\n            };\n        }\n\n        case 'descendant': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) => {\n                if (right(node, ancestry, options)) {\n                    for (let i = 0, l = ancestry.length; i < l; ++i) {\n                        if (left(ancestry[i], ancestry.slice(i + 1), options)) {\n                            return true;\n                        }\n                    }\n                }\n                return false;\n            };\n        }\n\n        case 'attribute': {\n            const path = selector.name.split('.');\n            switch (selector.operator) {\n                case void 0:\n                    return (node) => getPath(node, path) != null;\n                case '=':\n                    switch (selector.value.type) {\n                        case 'regexp':\n                            return (node) => {\n                                const p = getPath(node, path);\n                                return typeof p === 'string' && selector.value.value.test(p);\n                            };\n                        case 'literal': {\n                            const literal = `${selector.value.value}`;\n                            return (node) => literal === `${getPath(node, path)}`;\n                        }\n                        case 'type':\n                            return (node) => selector.value.value === typeof getPath(node, path);\n                    }\n                    throw new Error(`Unknown selector value type: ${selector.value.type}`);\n                case '!=':\n                    switch (selector.value.type) {\n                        case 'regexp':\n                            return (node) => !selector.value.value.test(getPath(node, path));\n                        case 'literal': {\n                            const literal = `${selector.value.value}`;\n                            return (node) => literal !== `${getPath(node, path)}`;\n                        }\n                        case 'type':\n                            return (node) => selector.value.value !== typeof getPath(node, path);\n                    }\n                    throw new Error(`Unknown selector value type: ${selector.value.type}`);\n                case '<=':\n                    return (node) => getPath(node, path) <= selector.value.value;\n                case '<':\n                    return (node) => getPath(node, path) < selector.value.value;\n                case '>':\n                    return (node) => getPath(node, path) > selector.value.value;\n                case '>=':\n                    return (node) => getPath(node, path) >= selector.value.value;\n            }\n            throw new Error(`Unknown operator: ${selector.operator}`);\n        }\n\n        case 'sibling': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    sibling(node, left, ancestry, LEFT_SIDE, options) ||\n                    selector.left.subject &&\n                    left(node, ancestry, options) &&\n                    sibling(node, right, ancestry, RIGHT_SIDE, options);\n        }\n\n        case 'adjacent': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    adjacent(node, left, ancestry, LEFT_SIDE, options) ||\n                    selector.right.subject &&\n                    left(node, ancestry, options) &&\n                    adjacent(node, right, ancestry, RIGHT_SIDE, options);\n        }\n\n        case 'nth-child': {\n            const nth = selector.index.value;\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    nthChild(node, ancestry, nth, options);\n        }\n\n        case 'nth-last-child': {\n            const nth = -selector.index.value;\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    nthChild(node, ancestry, nth, options);\n        }\n\n        case 'class': {\n            \n            const name = selector.name.toLowerCase();\n\n            return (node, ancestry, options) => {\n                \n                if (options && options.matchClass) {\n                    return options.matchClass(selector.name, node, ancestry);\n                }\n                \n                if (options && options.nodeTypeKey) return false;    \n\n                switch(name){\n                    case 'statement':\n                        if(node.type.slice(-9) === 'Statement') return true;\n                        // fallthrough: interface Declaration <: Statement { }\n                    case 'declaration':\n                        return node.type.slice(-11) === 'Declaration';\n                    case 'pattern':\n                        if(node.type.slice(-7) === 'Pattern') return true;\n                        // fallthrough: interface Expression <: Node, Pattern { }\n                    case 'expression':\n                        return node.type.slice(-10) === 'Expression' ||\n                            node.type.slice(-7) === 'Literal' ||\n                            (\n                                node.type === 'Identifier' &&\n                                (ancestry.length === 0 || ancestry[0].type !== 'MetaProperty')\n                            ) ||\n                            node.type === 'MetaProperty';\n                    case 'function':\n                        return node.type === 'FunctionDeclaration' ||\n                            node.type === 'FunctionExpression' ||\n                            node.type === 'ArrowFunctionExpression';\n                }\n                throw new Error(`Unknown class name: ${selector.name}`);\n            };\n        }\n    }\n\n    throw new Error(`Unknown selector type: ${selector.type}`);\n}\n\n/**\n * @callback TraverseOptionFallback\n * @param {external:AST} node The given node.\n * @returns {string[]} An array of visitor keys for the given node.\n */\n\n/**\n * @callback ClassMatcher\n * @param {string} className The name of the class to match.\n * @param {external:AST} node The node to match against.\n * @param {Array<external:AST>} ancestry The ancestry of the node.\n * @returns {boolean} True if the node matches the class, false if not.\n */\n\n/**\n * @typedef {object} ESQueryOptions\n * @property {string} [nodeTypeKey=\"type\"] By passing `nodeTypeKey`, we can allow other ASTs to use ESQuery.\n * @property { { [nodeType: string]: string[] } } [visitorKeys] By passing `visitorKeys` mapping, we can extend the properties of the nodes that traverse the node.\n * @property {TraverseOptionFallback} [fallback] By passing `fallback` option, we can control the properties of traversing nodes when encountering unknown nodes.\n * @property {ClassMatcher} [matchClass] By passing `matchClass` option, we can customize the interpretation of classes.\n */\n\n/**\n * Given a `node` and its ancestors, determine if `node` is matched\n * by `selector`.\n * @param {?external:AST} node\n * @param {?SelectorAST} selector\n * @param {external:AST[]} [ancestry=[]]\n * @param {ESQueryOptions} [options]\n * @throws {Error} Unknowns (operator, class name, selector type, or\n * selector value type)\n * @returns {boolean}\n */\nfunction matches(node, selector, ancestry, options) {\n    if (!selector) { return true; }\n    if (!node) { return false; }\n    if (!ancestry) { ancestry = []; }\n\n    return getMatcher(selector)(node, ancestry, options);\n}\n\n/**\n * Get visitor keys of a given node.\n * @param {external:AST} node The AST node to get keys.\n * @param {ESQueryOptions|undefined} options\n * @returns {string[]} Visitor keys of the node.\n */\nfunction getVisitorKeys(node, options) {\n    const nodeTypeKey = (options && options.nodeTypeKey) || 'type';\n\n    const nodeType = node[nodeTypeKey];\n    if (options && options.visitorKeys && options.visitorKeys[nodeType]) {\n        return options.visitorKeys[nodeType];\n    }\n    if (estraverse.VisitorKeys[nodeType]) {\n        return estraverse.VisitorKeys[nodeType];\n    }\n    if (options && typeof options.fallback === 'function') {\n        return options.fallback(node);\n    }\n    // 'iteration' fallback\n    return Object.keys(node).filter(function (key) {\n        return key !== nodeTypeKey;\n    });\n}\n\n\n/**\n * Check whether the given value is an ASTNode or not.\n * @param {any} node The value to check.\n * @param {ESQueryOptions|undefined} options The options to use.\n * @returns {boolean} `true` if the value is an ASTNode.\n */\nfunction isNode(node, options) {\n    const nodeTypeKey = (options && options.nodeTypeKey) || 'type';\n    return node !== null && typeof node === 'object' && typeof node[nodeTypeKey] === 'string';\n}\n\n/**\n * Determines if the given node has a sibling that matches the\n * given selector matcher.\n * @param {external:AST} node\n * @param {SelectorMatcher} matcher\n * @param {external:AST[]} ancestry\n * @param {Side} side\n * @param {ESQueryOptions|undefined} options\n * @returns {boolean}\n */\nfunction sibling(node, matcher, ancestry, side, options) {\n    const [parent] = ancestry;\n    if (!parent) { return false; }\n    const keys = getVisitorKeys(parent, options);\n    for (let i = 0; i < keys.length; ++i) {\n        const listProp = parent[keys[i]];\n        if (Array.isArray(listProp)) {\n            const startIndex = listProp.indexOf(node);\n            if (startIndex < 0) { continue; }\n            let lowerBound, upperBound;\n            if (side === LEFT_SIDE) {\n                lowerBound = 0;\n                upperBound = startIndex;\n            } else {\n                lowerBound = startIndex + 1;\n                upperBound = listProp.length;\n            }\n            for (let k = lowerBound; k < upperBound; ++k) {\n                if (isNode(listProp[k], options) && matcher(listProp[k], ancestry, options)) {\n                    return true;\n                }\n            }\n        }\n    }\n    return false;\n}\n\n/**\n * Determines if the given node has an adjacent sibling that matches\n * the given selector matcher.\n * @param {external:AST} node\n * @param {SelectorMatcher} matcher\n * @param {external:AST[]} ancestry\n * @param {Side} side\n * @param {ESQueryOptions|undefined} options\n * @returns {boolean}\n */\nfunction adjacent(node, matcher, ancestry, side, options) {\n    const [parent] = ancestry;\n    if (!parent) { return false; }\n    const keys = getVisitorKeys(parent, options);\n    for (let i = 0; i < keys.length; ++i) {\n        const listProp = parent[keys[i]];\n        if (Array.isArray(listProp)) {\n            const idx = listProp.indexOf(node);\n            if (idx < 0) { continue; }\n            if (side === LEFT_SIDE && idx > 0 && isNode(listProp[idx - 1], options) && matcher(listProp[idx - 1], ancestry, options)) {\n                return true;\n            }\n            if (side === RIGHT_SIDE && idx < listProp.length - 1 && isNode(listProp[idx + 1], options) &&  matcher(listProp[idx + 1], ancestry, options)) {\n                return true;\n            }\n        }\n    }\n    return false;\n}\n\n/**\n * Determines if the given node is the `nth` child.\n * If `nth` is negative then the position is counted\n * from the end of the list of children.\n * @param {external:AST} node\n * @param {external:AST[]} ancestry\n * @param {Integer} nth\n * @param {ESQueryOptions|undefined} options\n * @returns {boolean}\n */\nfunction nthChild(node, ancestry, nth, options) {\n    if (nth === 0) { return false; }\n    const [parent] = ancestry;\n    if (!parent) { return false; }\n    const keys = getVisitorKeys(parent, options);\n    for (let i = 0; i < keys.length; ++i) {\n        const listProp = parent[keys[i]];\n        if (Array.isArray(listProp)){\n            const idx = nth < 0 ? listProp.length + nth : nth - 1;\n            if (idx >= 0 && idx < listProp.length && listProp[idx] === node) {\n                return true;\n            }\n        }\n    }\n    return false;\n}\n\n/**\n * For each selector node marked as a subject, find the portion of the\n * selector that the subject must match.\n * @param {SelectorAST} selector\n * @param {SelectorAST} [ancestor] Defaults to `selector`\n * @returns {SelectorAST[]}\n */\nfunction subjects(selector, ancestor) {\n    if (selector == null || typeof selector != 'object') { return []; }\n    if (ancestor == null) { ancestor = selector; }\n    const results = selector.subject ? [ancestor] : [];\n    const keys = Object.keys(selector);\n    for (let i = 0; i < keys.length; ++i) {\n        const p = keys[i];\n        const sel = selector[p];\n        results.push(...subjects(sel, p === 'left' ? sel : ancestor));\n    }\n    return results;\n}\n\n/**\n* @callback TraverseVisitor\n* @param {?external:AST} node\n* @param {?external:AST} parent\n* @param {external:AST[]} ancestry\n*/\n\n/**\n * From a JS AST and a selector AST, collect all JS AST nodes that\n * match the selector.\n * @param {external:AST} ast\n * @param {?SelectorAST} selector\n * @param {TraverseVisitor} visitor\n * @param {ESQueryOptions} [options]\n * @returns {external:AST[]}\n */\nfunction traverse(ast, selector, visitor, options) {\n    if (!selector) { return; }\n    const ancestry = [];\n    const matcher = getMatcher(selector);\n    const altSubjects = subjects(selector).map(getMatcher);\n    estraverse.traverse(ast, {\n        enter (node, parent) {\n            if (parent != null) { ancestry.unshift(parent); }\n            if (matcher(node, ancestry, options)) {\n                if (altSubjects.length) {\n                    for (let i = 0, l = altSubjects.length; i < l; ++i) {\n                        if (altSubjects[i](node, ancestry, options)) {\n                            visitor(node, parent, ancestry);\n                        }\n                        for (let k = 0, m = ancestry.length; k < m; ++k) {\n                            const succeedingAncestry = ancestry.slice(k + 1);\n                            if (altSubjects[i](ancestry[k], succeedingAncestry, options)) {\n                                visitor(ancestry[k], parent, succeedingAncestry);\n                            }\n                        }\n                    }\n                } else {\n                    visitor(node, parent, ancestry);\n                }\n            }\n        },\n        leave () { ancestry.shift(); },\n        keys: options && options.visitorKeys,\n        fallback: options && options.fallback || 'iteration'\n    });\n}\n\n\n/**\n * From a JS AST and a selector AST, collect all JS AST nodes that\n * match the selector.\n * @param {external:AST} ast\n * @param {?SelectorAST} selector\n * @param {ESQueryOptions} [options]\n * @returns {external:AST[]}\n */\nfunction match(ast, selector, options) {\n    const results = [];\n    traverse(ast, selector, function (node) {\n        results.push(node);\n    }, options);\n    return results;\n}\n\n/**\n * Parse a selector string and return its AST.\n * @param {string} selector\n * @returns {SelectorAST}\n */\nfunction parse(selector) {\n    return parser.parse(selector);\n}\n\n/**\n * Query the code AST using the selector string.\n * @param {external:AST} ast\n * @param {string} selector\n * @param {ESQueryOptions} [options]\n * @returns {external:AST[]}\n */\nfunction query(ast, selector, options) {\n    return match(ast, parse(selector), options);\n}\n\nquery.parse = parse;\nquery.match = match;\nquery.traverse = traverse;\nquery.matches = matches;\nquery.query = query;\n\nexport default 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Index: frontend/node_modules/esquery/dist/esquery.min.js
===================================================================
--- frontend/node_modules/esquery/dist/esquery.min.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/dist/esquery.min.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
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c(e){if(null==e)return function(){return!0};if(null!=l){var t=l.get(e);return null!=t||(t=f(e),l.set(e,t)),t}return f(e)}function f(e){switch(e.type){case"wildcard":return function(){return!0};case"identifier":var t=e.value.toLowerCase();return function(e,r,n){var o=n&&n.nodeTypeKey||"type";return t===e[o].toLowerCase()};case"exactNode":return function(e,t){return 0===t.length};case"field":var r=e.name.split(".");return function(e,t){return function e(t,r,n,o){for(var a=r,i=o;i<n.length;++i){if(null==a)return!1;var s=a[n[i]];if(Array.isArray(s)){for(var u=0;u<s.length;++u)if(e(t,s[u],n,i+1))return!0;return!1}a=s}return t===a}(e,t[r.length-1],r,0)};case"matches":var o=e.selectors.map(c);return function(e,t,r){for(var n=0;n<o.length;++n)if(o[n](e,t,r))return!0;return!1};case"compound":var a=e.selectors.map(c);return function(e,t,r){for(var n=0;n<a.length;++n)if(!a[n](e,t,r))return!1;return!0};case"not":var s=e.selectors.map(c);return function(e,t,r){for(var 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e.value.value===n(u(t,v))}}throw new Error("Unknown selector value type: ".concat(e.value.type));case"!=":switch(e.value.type){case"regexp":return function(t){return!e.value.value.test(u(t,v))};case"literal":var A="".concat(e.value.value);return function(e){return A!=="".concat(u(e,v))};case"type":return function(t){return e.value.value!==n(u(t,v))}}throw new Error("Unknown selector value type: ".concat(e.value.type));case"<=":return function(t){return u(t,v)<=e.value.value};case"<":return function(t){return u(t,v)<e.value.value};case">":return function(t){return u(t,v)>e.value.value};case">=":return function(t){return u(t,v)>=e.value.value}}throw new Error("Unknown operator: ".concat(e.operator));case"sibling":var E=c(e.left),b=c(e.right);return function(t,r,n){return b(t,r,n)&&d(t,E,r,"LEFT_SIDE",n)||e.left.subject&&E(t,r,n)&&d(t,b,r,"RIGHT_SIDE",n)};case"adjacent":var S=c(e.left),_=c(e.right);return function(t,r,n){return _(t,r,n)&&y(t,S,r,"LEFT_SIDE",n)||e.right.subject&&S(t,r,n)&&y(t,_,r,"RIGHT_SIDE",n)};case"nth-child":var C=e.index.value,P=c(e.right);return function(e,t,r){return P(e,t,r)&&m(e,t,C,r)};case"nth-last-child":var w=-e.index.value,k=c(e.right);return function(e,t,r){return k(e,t,r)&&m(e,t,w,r)};case"class":var D=e.name.toLowerCase();return function(t,r,n){if(n&&n.matchClass)return n.matchClass(e.name,t,r);if(n&&n.nodeTypeKey)return!1;switch(D){case"statement":if("Statement"===t.type.slice(-9))return!0;case"declaration":return"Declaration"===t.type.slice(-11);case"pattern":if("Pattern"===t.type.slice(-7))return!0;case"expression":return"Expression"===t.type.slice(-10)||"Literal"===t.type.slice(-7)||"Identifier"===t.type&&(0===r.length||"MetaProperty"!==r[0].type)||"MetaProperty"===t.type;case"function":return"FunctionDeclaration"===t.type||"FunctionExpression"===t.type||"ArrowFunctionExpression"===t.type}throw new Error("Unknown class name: ".concat(e.name))}}throw new Error("Unknown selector type: ".concat(e.type))}function p(e,t){var r=t&&t.nodeTypeKey||"type",n=e[r];return t&&t.visitorKeys&&t.visitorKeys[n]?t.visitorKeys[n]:i.VisitorKeys[n]?i.VisitorKeys[n]:t&&"function"==typeof t.fallback?t.fallback(e):Object.keys(e).filter((function(e){return e!==r}))}function h(e,t){var r=t&&t.nodeTypeKey||"type";return null!==e&&"object"===n(e)&&"string"==typeof e[r]}function d(e,r,n,o,a){var i=t(n,1)[0];if(!i)return!1;for(var s=p(i,a),u=0;u<s.length;++u){var l=i[s[u]];if(Array.isArray(l)){var c=l.indexOf(e);if(c<0)continue;var f=void 0,d=void 0;"LEFT_SIDE"===o?(f=0,d=c):(f=c+1,d=l.length);for(var y=f;y<d;++y)if(h(l[y],a)&&r(l[y],n,a))return!0}}return!1}function y(e,r,n,o,a){var i=t(n,1)[0];if(!i)return!1;for(var s=p(i,a),u=0;u<s.length;++u){var l=i[s[u]];if(Array.isArray(l)){var c=l.indexOf(e);if(c<0)continue;if("LEFT_SIDE"===o&&c>0&&h(l[c-1],a)&&r(l[c-1],n,a))return!0;if("RIGHT_SIDE"===o&&c<l.length-1&&h(l[c+1],a)&&r(l[c+1],n,a))return!0}}return!1}function m(e,r,n,o){if(0===n)return!1;var a=t(r,1)[0];if(!a)return!1;for(var i=p(a,o),s=0;s<i.length;++s){var u=a[i[s]];if(Array.isArray(u)){var l=n<0?u.length+n:n-1;if(l>=0&&l<u.length&&u[l]===e)return!0}}return!1}function x(e,t,o,a){if(t){var s=[],u=c(t),l=function e(t,o){if(null==t||"object"!=n(t))return[];null==o&&(o=t);for(var a=t.subject?[o]:[],i=Object.keys(t),s=0;s<i.length;++s){var u=i[s],l=t[u];a.push.apply(a,r(e(l,"left"===u?l:o)))}return a}(t).map(c);i.traverse(e,{enter:function(e,t){if(null!=t&&s.unshift(t),u(e,s,a))if(l.length)for(var r=0,n=l.length;r<n;++r){l[r](e,s,a)&&o(e,t,s);for(var i=0,c=s.length;i<c;++i){var f=s.slice(i+1);l[r](s[i],f,a)&&o(s[i],t,f)}}else o(e,t,s)},leave:function(){s.shift()},keys:a&&a.visitorKeys,fallback:a&&a.fallback||"iteration"})}}function v(e,t,r){var n=[];return x(e,t,(function(e){n.push(e)}),r),n}function g(e){return s.parse(e)}function A(e,t,r){return v(e,g(t),r)}return A.parse=g,A.match=v,A.traverse=x,A.matches=function(e,t,r,n){return!t||!!e&&(r||(r=[]),c(t)(e,r,n))},A.query=A,A}));
+//# sourceMappingURL=esquery.min.js.map
Index: frontend/node_modules/esquery/dist/esquery.min.js.map
===================================================================
--- frontend/node_modules/esquery/dist/esquery.min.js.map	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/dist/esquery.min.js.map	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+{"version":3,"file":"esquery.min.js","sources":["../node_modules/estraverse/estraverse.js","../parser.js","../esquery.js"],"sourcesContent":["/*\n  Copyright (C) 2012-2013 Yusuke Suzuki <utatane.tea@gmail.com>\n  Copyright (C) 2012 Ariya Hidayat <ariya.hidayat@gmail.com>\n\n  Redistribution and use in source and binary forms, with or without\n  modification, are permitted provided that the following conditions are met:\n\n    * Redistributions of source code must retain the above copyright\n      notice, this list of conditions and the following disclaimer.\n    * Redistributions in binary form must reproduce the above copyright\n      notice, this list of conditions and the following disclaimer in the\n      documentation and/or other materials provided with the distribution.\n\n  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\"\n  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\n  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\n  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY\n  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\n  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND\n  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF\n  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n*/\n/*jslint vars:false, bitwise:true*/\n/*jshint indent:4*/\n/*global exports:true*/\n(function clone(exports) {\n    'use strict';\n\n    var Syntax,\n        VisitorOption,\n        VisitorKeys,\n        BREAK,\n        SKIP,\n        REMOVE;\n\n    function deepCopy(obj) {\n        var ret = {}, key, val;\n        for (key in obj) {\n            if (obj.hasOwnProperty(key)) {\n                val = obj[key];\n                if (typeof val === 'object' && val !== null) {\n                    ret[key] = deepCopy(val);\n                } else {\n                    ret[key] = val;\n                }\n            }\n        }\n        return ret;\n    }\n\n    // based on LLVM libc++ upper_bound / lower_bound\n    // MIT License\n\n    function upperBound(array, func) {\n        var diff, len, i, current;\n\n        len = array.length;\n        i = 0;\n\n        while (len) {\n            diff = len >>> 1;\n            current = i + diff;\n            if (func(array[current])) {\n                len = diff;\n            } else {\n                i = current + 1;\n                len -= diff + 1;\n            }\n        }\n        return i;\n    }\n\n    Syntax = {\n        AssignmentExpression: 'AssignmentExpression',\n        AssignmentPattern: 'AssignmentPattern',\n        ArrayExpression: 'ArrayExpression',\n        ArrayPattern: 'ArrayPattern',\n        ArrowFunctionExpression: 'ArrowFunctionExpression',\n        AwaitExpression: 'AwaitExpression', // CAUTION: It's deferred to ES7.\n        BlockStatement: 'BlockStatement',\n        BinaryExpression: 'BinaryExpression',\n        BreakStatement: 'BreakStatement',\n        CallExpression: 'CallExpression',\n        CatchClause: 'CatchClause',\n        ChainExpression: 'ChainExpression',\n        ClassBody: 'ClassBody',\n        ClassDeclaration: 'ClassDeclaration',\n        ClassExpression: 'ClassExpression',\n        ComprehensionBlock: 'ComprehensionBlock',  // CAUTION: It's deferred to ES7.\n        ComprehensionExpression: 'ComprehensionExpression',  // CAUTION: It's deferred to ES7.\n        ConditionalExpression: 'ConditionalExpression',\n        ContinueStatement: 'ContinueStatement',\n        DebuggerStatement: 'DebuggerStatement',\n        DirectiveStatement: 'DirectiveStatement',\n        DoWhileStatement: 'DoWhileStatement',\n        EmptyStatement: 'EmptyStatement',\n        ExportAllDeclaration: 'ExportAllDeclaration',\n        ExportDefaultDeclaration: 'ExportDefaultDeclaration',\n        ExportNamedDeclaration: 'ExportNamedDeclaration',\n        ExportSpecifier: 'ExportSpecifier',\n        ExpressionStatement: 'ExpressionStatement',\n        ForStatement: 'ForStatement',\n        ForInStatement: 'ForInStatement',\n        ForOfStatement: 'ForOfStatement',\n        FunctionDeclaration: 'FunctionDeclaration',\n        FunctionExpression: 'FunctionExpression',\n        GeneratorExpression: 'GeneratorExpression',  // CAUTION: It's deferred to ES7.\n        Identifier: 'Identifier',\n        IfStatement: 'IfStatement',\n        ImportExpression: 'ImportExpression',\n        ImportDeclaration: 'ImportDeclaration',\n        ImportDefaultSpecifier: 'ImportDefaultSpecifier',\n        ImportNamespaceSpecifier: 'ImportNamespaceSpecifier',\n        ImportSpecifier: 'ImportSpecifier',\n        Literal: 'Literal',\n        LabeledStatement: 'LabeledStatement',\n        LogicalExpression: 'LogicalExpression',\n        MemberExpression: 'MemberExpression',\n        MetaProperty: 'MetaProperty',\n        MethodDefinition: 'MethodDefinition',\n        ModuleSpecifier: 'ModuleSpecifier',\n        NewExpression: 'NewExpression',\n        ObjectExpression: 'ObjectExpression',\n        ObjectPattern: 'ObjectPattern',\n        PrivateIdentifier: 'PrivateIdentifier',\n        Program: 'Program',\n        Property: 'Property',\n        PropertyDefinition: 'PropertyDefinition',\n        RestElement: 'RestElement',\n        ReturnStatement: 'ReturnStatement',\n        SequenceExpression: 'SequenceExpression',\n        SpreadElement: 'SpreadElement',\n        Super: 'Super',\n        SwitchStatement: 'SwitchStatement',\n        SwitchCase: 'SwitchCase',\n        TaggedTemplateExpression: 'TaggedTemplateExpression',\n        TemplateElement: 'TemplateElement',\n        TemplateLiteral: 'TemplateLiteral',\n        ThisExpression: 'ThisExpression',\n        ThrowStatement: 'ThrowStatement',\n        TryStatement: 'TryStatement',\n        UnaryExpression: 'UnaryExpression',\n        UpdateExpression: 'UpdateExpression',\n        VariableDeclaration: 'VariableDeclaration',\n        VariableDeclarator: 'VariableDeclarator',\n        WhileStatement: 'WhileStatement',\n        WithStatement: 'WithStatement',\n        YieldExpression: 'YieldExpression'\n    };\n\n    VisitorKeys = {\n        AssignmentExpression: ['left', 'right'],\n        AssignmentPattern: ['left', 'right'],\n        ArrayExpression: ['elements'],\n        ArrayPattern: ['elements'],\n        ArrowFunctionExpression: ['params', 'body'],\n        AwaitExpression: ['argument'], // CAUTION: It's deferred to ES7.\n        BlockStatement: ['body'],\n        BinaryExpression: ['left', 'right'],\n        BreakStatement: ['label'],\n        CallExpression: ['callee', 'arguments'],\n        CatchClause: ['param', 'body'],\n        ChainExpression: ['expression'],\n        ClassBody: ['body'],\n        ClassDeclaration: ['id', 'superClass', 'body'],\n        ClassExpression: ['id', 'superClass', 'body'],\n        ComprehensionBlock: ['left', 'right'],  // CAUTION: It's deferred to ES7.\n        ComprehensionExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.\n        ConditionalExpression: ['test', 'consequent', 'alternate'],\n        ContinueStatement: ['label'],\n        DebuggerStatement: [],\n        DirectiveStatement: [],\n        DoWhileStatement: ['body', 'test'],\n        EmptyStatement: [],\n        ExportAllDeclaration: ['source'],\n        ExportDefaultDeclaration: ['declaration'],\n        ExportNamedDeclaration: ['declaration', 'specifiers', 'source'],\n        ExportSpecifier: ['exported', 'local'],\n        ExpressionStatement: ['expression'],\n        ForStatement: ['init', 'test', 'update', 'body'],\n        ForInStatement: ['left', 'right', 'body'],\n        ForOfStatement: ['left', 'right', 'body'],\n        FunctionDeclaration: ['id', 'params', 'body'],\n        FunctionExpression: ['id', 'params', 'body'],\n        GeneratorExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.\n        Identifier: [],\n        IfStatement: ['test', 'consequent', 'alternate'],\n        ImportExpression: ['source'],\n        ImportDeclaration: ['specifiers', 'source'],\n        ImportDefaultSpecifier: ['local'],\n        ImportNamespaceSpecifier: ['local'],\n        ImportSpecifier: ['imported', 'local'],\n        Literal: [],\n        LabeledStatement: ['label', 'body'],\n        LogicalExpression: ['left', 'right'],\n        MemberExpression: ['object', 'property'],\n        MetaProperty: ['meta', 'property'],\n        MethodDefinition: ['key', 'value'],\n        ModuleSpecifier: [],\n        NewExpression: ['callee', 'arguments'],\n        ObjectExpression: ['properties'],\n        ObjectPattern: ['properties'],\n        PrivateIdentifier: [],\n        Program: ['body'],\n        Property: ['key', 'value'],\n        PropertyDefinition: ['key', 'value'],\n        RestElement: [ 'argument' ],\n        ReturnStatement: ['argument'],\n        SequenceExpression: ['expressions'],\n        SpreadElement: ['argument'],\n        Super: [],\n        SwitchStatement: ['discriminant', 'cases'],\n        SwitchCase: ['test', 'consequent'],\n        TaggedTemplateExpression: ['tag', 'quasi'],\n        TemplateElement: [],\n        TemplateLiteral: ['quasis', 'expressions'],\n        ThisExpression: [],\n        ThrowStatement: ['argument'],\n        TryStatement: ['block', 'handler', 'finalizer'],\n        UnaryExpression: ['argument'],\n        UpdateExpression: ['argument'],\n        VariableDeclaration: ['declarations'],\n        VariableDeclarator: ['id', 'init'],\n        WhileStatement: ['test', 'body'],\n        WithStatement: ['object', 'body'],\n        YieldExpression: ['argument']\n    };\n\n    // unique id\n    BREAK = {};\n    SKIP = {};\n    REMOVE = {};\n\n    VisitorOption = {\n        Break: BREAK,\n        Skip: SKIP,\n        Remove: REMOVE\n    };\n\n    function Reference(parent, key) {\n        this.parent = parent;\n        this.key = key;\n    }\n\n    Reference.prototype.replace = function replace(node) {\n        this.parent[this.key] = node;\n    };\n\n    Reference.prototype.remove = function remove() {\n        if (Array.isArray(this.parent)) {\n            this.parent.splice(this.key, 1);\n            return true;\n        } else {\n            this.replace(null);\n            return false;\n        }\n    };\n\n    function Element(node, path, wrap, ref) {\n        this.node = node;\n        this.path = path;\n        this.wrap = wrap;\n        this.ref = ref;\n    }\n\n    function Controller() { }\n\n    // API:\n    // return property path array from root to current node\n    Controller.prototype.path = function path() {\n        var i, iz, j, jz, result, element;\n\n        function addToPath(result, path) {\n            if (Array.isArray(path)) {\n                for (j = 0, jz = path.length; j < jz; ++j) {\n                    result.push(path[j]);\n                }\n            } else {\n                result.push(path);\n            }\n        }\n\n        // root node\n        if (!this.__current.path) {\n            return null;\n        }\n\n        // first node is sentinel, second node is root element\n        result = [];\n        for (i = 2, iz = this.__leavelist.length; i < iz; ++i) {\n            element = this.__leavelist[i];\n            addToPath(result, element.path);\n        }\n        addToPath(result, this.__current.path);\n        return result;\n    };\n\n    // API:\n    // return type of current node\n    Controller.prototype.type = function () {\n        var node = this.current();\n        return node.type || this.__current.wrap;\n    };\n\n    // API:\n    // return array of parent elements\n    Controller.prototype.parents = function parents() {\n        var i, iz, result;\n\n        // first node is sentinel\n        result = [];\n        for (i = 1, iz = this.__leavelist.length; i < iz; ++i) {\n            result.push(this.__leavelist[i].node);\n        }\n\n        return result;\n    };\n\n    // API:\n    // return current node\n    Controller.prototype.current = function current() {\n        return this.__current.node;\n    };\n\n    Controller.prototype.__execute = function __execute(callback, element) {\n        var previous, result;\n\n        result = undefined;\n\n        previous  = this.__current;\n        this.__current = element;\n        this.__state = null;\n        if (callback) {\n            result = callback.call(this, element.node, this.__leavelist[this.__leavelist.length - 1].node);\n        }\n        this.__current = previous;\n\n        return result;\n    };\n\n    // API:\n    // notify control skip / break\n    Controller.prototype.notify = function notify(flag) {\n        this.__state = flag;\n    };\n\n    // API:\n    // skip child nodes of current node\n    Controller.prototype.skip = function () {\n        this.notify(SKIP);\n    };\n\n    // API:\n    // break traversals\n    Controller.prototype['break'] = function () {\n        this.notify(BREAK);\n    };\n\n    // API:\n    // remove node\n    Controller.prototype.remove = function () {\n        this.notify(REMOVE);\n    };\n\n    Controller.prototype.__initialize = function(root, visitor) {\n        this.visitor = visitor;\n        this.root = root;\n        this.__worklist = [];\n        this.__leavelist = [];\n        this.__current = null;\n        this.__state = null;\n        this.__fallback = null;\n        if (visitor.fallback === 'iteration') {\n            this.__fallback = Object.keys;\n        } else if (typeof visitor.fallback === 'function') {\n            this.__fallback = visitor.fallback;\n        }\n\n        this.__keys = VisitorKeys;\n        if (visitor.keys) {\n            this.__keys = Object.assign(Object.create(this.__keys), visitor.keys);\n        }\n    };\n\n    function isNode(node) {\n        if (node == null) {\n            return false;\n        }\n        return typeof node === 'object' && typeof node.type === 'string';\n    }\n\n    function isProperty(nodeType, key) {\n        return (nodeType === Syntax.ObjectExpression || nodeType === Syntax.ObjectPattern) && 'properties' === key;\n    }\n  \n    function candidateExistsInLeaveList(leavelist, candidate) {\n        for (var i = leavelist.length - 1; i >= 0; --i) {\n            if (leavelist[i].node === candidate) {\n                return true;\n            }\n        }\n        return false;\n    }\n\n    Controller.prototype.traverse = function traverse(root, visitor) {\n        var worklist,\n            leavelist,\n            element,\n            node,\n            nodeType,\n            ret,\n            key,\n            current,\n            current2,\n            candidates,\n            candidate,\n            sentinel;\n\n        this.__initialize(root, visitor);\n\n        sentinel = {};\n\n        // reference\n        worklist = this.__worklist;\n        leavelist = this.__leavelist;\n\n        // initialize\n        worklist.push(new Element(root, null, null, null));\n        leavelist.push(new Element(null, null, null, null));\n\n        while (worklist.length) {\n            element = worklist.pop();\n\n            if (element === sentinel) {\n                element = leavelist.pop();\n\n                ret = this.__execute(visitor.leave, element);\n\n                if (this.__state === BREAK || ret === BREAK) {\n                    return;\n                }\n                continue;\n            }\n\n            if (element.node) {\n\n                ret = this.__execute(visitor.enter, element);\n\n                if (this.__state === BREAK || ret === BREAK) {\n                    return;\n                }\n\n                worklist.push(sentinel);\n                leavelist.push(element);\n\n                if (this.__state === SKIP || ret === SKIP) {\n                    continue;\n                }\n\n                node = element.node;\n                nodeType = node.type || element.wrap;\n                candidates = this.__keys[nodeType];\n                if (!candidates) {\n                    if (this.__fallback) {\n                        candidates = this.__fallback(node);\n                    } else {\n                        throw new Error('Unknown node type ' + nodeType + '.');\n                    }\n                }\n\n                current = candidates.length;\n                while ((current -= 1) >= 0) {\n                    key = candidates[current];\n                    candidate = node[key];\n                    if (!candidate) {\n                        continue;\n                    }\n\n                    if (Array.isArray(candidate)) {\n                        current2 = candidate.length;\n                        while ((current2 -= 1) >= 0) {\n                            if (!candidate[current2]) {\n                                continue;\n                            }\n\n                            if (candidateExistsInLeaveList(leavelist, candidate[current2])) {\n                              continue;\n                            }\n\n                            if (isProperty(nodeType, candidates[current])) {\n                                element = new Element(candidate[current2], [key, current2], 'Property', null);\n                            } else if (isNode(candidate[current2])) {\n                                element = new Element(candidate[current2], [key, current2], null, null);\n                            } else {\n                                continue;\n                            }\n                            worklist.push(element);\n                        }\n                    } else if (isNode(candidate)) {\n                        if (candidateExistsInLeaveList(leavelist, candidate)) {\n                          continue;\n                        }\n\n                        worklist.push(new Element(candidate, key, null, null));\n                    }\n                }\n            }\n        }\n    };\n\n    Controller.prototype.replace = function replace(root, visitor) {\n        var worklist,\n            leavelist,\n            node,\n            nodeType,\n            target,\n            element,\n            current,\n            current2,\n            candidates,\n            candidate,\n            sentinel,\n            outer,\n            key;\n\n        function removeElem(element) {\n            var i,\n                key,\n                nextElem,\n                parent;\n\n            if (element.ref.remove()) {\n                // When the reference is an element of an array.\n                key = element.ref.key;\n                parent = element.ref.parent;\n\n                // If removed from array, then decrease following items' keys.\n                i = worklist.length;\n                while (i--) {\n                    nextElem = worklist[i];\n                    if (nextElem.ref && nextElem.ref.parent === parent) {\n                        if  (nextElem.ref.key < key) {\n                            break;\n                        }\n                        --nextElem.ref.key;\n                    }\n                }\n            }\n        }\n\n        this.__initialize(root, visitor);\n\n        sentinel = {};\n\n        // reference\n        worklist = this.__worklist;\n        leavelist = this.__leavelist;\n\n        // initialize\n        outer = {\n            root: root\n        };\n        element = new Element(root, null, null, new Reference(outer, 'root'));\n        worklist.push(element);\n        leavelist.push(element);\n\n        while (worklist.length) {\n            element = worklist.pop();\n\n            if (element === sentinel) {\n                element = leavelist.pop();\n\n                target = this.__execute(visitor.leave, element);\n\n                // node may be replaced with null,\n                // so distinguish between undefined and null in this place\n                if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {\n                    // replace\n                    element.ref.replace(target);\n                }\n\n                if (this.__state === REMOVE || target === REMOVE) {\n                    removeElem(element);\n                }\n\n                if (this.__state === BREAK || target === BREAK) {\n                    return outer.root;\n                }\n                continue;\n            }\n\n            target = this.__execute(visitor.enter, element);\n\n            // node may be replaced with null,\n            // so distinguish between undefined and null in this place\n            if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {\n                // replace\n                element.ref.replace(target);\n                element.node = target;\n            }\n\n            if (this.__state === REMOVE || target === REMOVE) {\n                removeElem(element);\n                element.node = null;\n            }\n\n            if (this.__state === BREAK || target === BREAK) {\n                return outer.root;\n            }\n\n            // node may be null\n            node = element.node;\n            if (!node) {\n                continue;\n            }\n\n            worklist.push(sentinel);\n            leavelist.push(element);\n\n            if (this.__state === SKIP || target === SKIP) {\n                continue;\n            }\n\n            nodeType = node.type || element.wrap;\n            candidates = this.__keys[nodeType];\n            if (!candidates) {\n                if (this.__fallback) {\n                    candidates = this.__fallback(node);\n                } else {\n                    throw new Error('Unknown node type ' + nodeType + '.');\n                }\n            }\n\n            current = candidates.length;\n            while ((current -= 1) >= 0) {\n                key = candidates[current];\n                candidate = node[key];\n                if (!candidate) {\n                    continue;\n                }\n\n                if (Array.isArray(candidate)) {\n                    current2 = candidate.length;\n                    while ((current2 -= 1) >= 0) {\n                        if (!candidate[current2]) {\n                            continue;\n                        }\n                        if (isProperty(nodeType, candidates[current])) {\n                            element = new Element(candidate[current2], [key, current2], 'Property', new Reference(candidate, current2));\n                        } else if (isNode(candidate[current2])) {\n                            element = new Element(candidate[current2], [key, current2], null, new Reference(candidate, current2));\n                        } else {\n                            continue;\n                        }\n                        worklist.push(element);\n                    }\n                } else if (isNode(candidate)) {\n                    worklist.push(new Element(candidate, key, null, new Reference(node, key)));\n                }\n            }\n        }\n\n        return outer.root;\n    };\n\n    function traverse(root, visitor) {\n        var controller = new Controller();\n        return controller.traverse(root, visitor);\n    }\n\n    function replace(root, visitor) {\n        var controller = new Controller();\n        return controller.replace(root, visitor);\n    }\n\n    function extendCommentRange(comment, tokens) {\n        var target;\n\n        target = upperBound(tokens, function search(token) {\n            return token.range[0] > comment.range[0];\n        });\n\n        comment.extendedRange = [comment.range[0], comment.range[1]];\n\n        if (target !== tokens.length) {\n            comment.extendedRange[1] = tokens[target].range[0];\n        }\n\n        target -= 1;\n        if (target >= 0) {\n            comment.extendedRange[0] = tokens[target].range[1];\n        }\n\n        return comment;\n    }\n\n    function attachComments(tree, providedComments, tokens) {\n        // At first, we should calculate extended comment ranges.\n        var comments = [], comment, len, i, cursor;\n\n        if (!tree.range) {\n            throw new Error('attachComments needs range information');\n        }\n\n        // tokens array is empty, we attach comments to tree as 'leadingComments'\n        if (!tokens.length) {\n            if (providedComments.length) {\n                for (i = 0, len = providedComments.length; i < len; i += 1) {\n                    comment = deepCopy(providedComments[i]);\n                    comment.extendedRange = [0, tree.range[0]];\n                    comments.push(comment);\n                }\n                tree.leadingComments = comments;\n            }\n            return tree;\n        }\n\n        for (i = 0, len = providedComments.length; i < len; i += 1) {\n            comments.push(extendCommentRange(deepCopy(providedComments[i]), tokens));\n        }\n\n        // This is based on John Freeman's implementation.\n        cursor = 0;\n        traverse(tree, {\n            enter: function (node) {\n                var comment;\n\n                while (cursor < comments.length) {\n                    comment = comments[cursor];\n                    if (comment.extendedRange[1] > node.range[0]) {\n                        break;\n                    }\n\n                    if (comment.extendedRange[1] === node.range[0]) {\n                        if (!node.leadingComments) {\n                            node.leadingComments = [];\n                        }\n                        node.leadingComments.push(comment);\n                        comments.splice(cursor, 1);\n                    } else {\n                        cursor += 1;\n                    }\n                }\n\n                // already out of owned node\n                if (cursor === comments.length) {\n                    return VisitorOption.Break;\n                }\n\n                if (comments[cursor].extendedRange[0] > node.range[1]) {\n                    return VisitorOption.Skip;\n                }\n            }\n        });\n\n        cursor = 0;\n        traverse(tree, {\n            leave: function (node) {\n                var comment;\n\n                while (cursor < comments.length) {\n                    comment = comments[cursor];\n                    if (node.range[1] < comment.extendedRange[0]) {\n                        break;\n                    }\n\n                    if (node.range[1] === comment.extendedRange[0]) {\n                        if (!node.trailingComments) {\n                            node.trailingComments = [];\n                        }\n                        node.trailingComments.push(comment);\n                        comments.splice(cursor, 1);\n                    } else {\n                        cursor += 1;\n                    }\n                }\n\n                // already out of owned node\n                if (cursor === comments.length) {\n                    return VisitorOption.Break;\n                }\n\n                if (comments[cursor].extendedRange[0] > node.range[1]) {\n                    return VisitorOption.Skip;\n                }\n            }\n        });\n\n        return tree;\n    }\n\n    exports.Syntax = Syntax;\n    exports.traverse = traverse;\n    exports.replace = replace;\n    exports.attachComments = attachComments;\n    exports.VisitorKeys = VisitorKeys;\n    exports.VisitorOption = VisitorOption;\n    exports.Controller = Controller;\n    exports.cloneEnvironment = function () { return clone({}); };\n\n    return exports;\n}(exports));\n/* vim: set sw=4 ts=4 et tw=80 : */\n","/*\n * Generated by PEG.js 0.10.0.\n *\n * http://pegjs.org/\n */\n(function(root, factory) {\n  if (typeof define === \"function\" && define.amd) {\n    define([], factory);\n  } else if (typeof module === \"object\" && module.exports) {\n    module.exports = factory();\n  }\n})(this, function() {\n  \"use strict\";\n\n  function peg$subclass(child, parent) {\n    function ctor() { this.constructor = child; }\n    ctor.prototype = parent.prototype;\n    child.prototype = new ctor();\n  }\n\n  function peg$SyntaxError(message, expected, found, location) {\n    this.message  = message;\n    this.expected = expected;\n    this.found    = found;\n    this.location = location;\n    this.name     = \"SyntaxError\";\n\n    if (typeof Error.captureStackTrace === \"function\") {\n      Error.captureStackTrace(this, peg$SyntaxError);\n    }\n  }\n\n  peg$subclass(peg$SyntaxError, Error);\n\n  peg$SyntaxError.buildMessage = function(expected, found) {\n    var DESCRIBE_EXPECTATION_FNS = {\n          literal: function(expectation) {\n            return \"\\\"\" + literalEscape(expectation.text) + \"\\\"\";\n          },\n\n          \"class\": function(expectation) {\n            var escapedParts = \"\",\n                i;\n\n            for (i = 0; i < expectation.parts.length; i++) {\n              escapedParts += expectation.parts[i] instanceof Array\n                ? classEscape(expectation.parts[i][0]) + \"-\" + classEscape(expectation.parts[i][1])\n                : classEscape(expectation.parts[i]);\n            }\n\n            return \"[\" + (expectation.inverted ? \"^\" : \"\") + escapedParts + \"]\";\n          },\n\n          any: function(expectation) {\n            return \"any character\";\n          },\n\n          end: function(expectation) {\n            return \"end of input\";\n          },\n\n          other: function(expectation) {\n            return expectation.description;\n          }\n        };\n\n    function hex(ch) {\n      return ch.charCodeAt(0).toString(16).toUpperCase();\n    }\n\n    function literalEscape(s) {\n      return s\n        .replace(/\\\\/g, '\\\\\\\\')\n        .replace(/\"/g,  '\\\\\"')\n        .replace(/\\0/g, '\\\\0')\n        .replace(/\\t/g, '\\\\t')\n        .replace(/\\n/g, '\\\\n')\n        .replace(/\\r/g, '\\\\r')\n        .replace(/[\\x00-\\x0F]/g,          function(ch) { return '\\\\x0' + hex(ch); })\n        .replace(/[\\x10-\\x1F\\x7F-\\x9F]/g, function(ch) { return '\\\\x'  + hex(ch); });\n    }\n\n    function classEscape(s) {\n      return s\n        .replace(/\\\\/g, '\\\\\\\\')\n        .replace(/\\]/g, '\\\\]')\n        .replace(/\\^/g, '\\\\^')\n        .replace(/-/g,  '\\\\-')\n        .replace(/\\0/g, '\\\\0')\n        .replace(/\\t/g, '\\\\t')\n        .replace(/\\n/g, '\\\\n')\n        .replace(/\\r/g, '\\\\r')\n        .replace(/[\\x00-\\x0F]/g,          function(ch) { return '\\\\x0' + hex(ch); })\n        .replace(/[\\x10-\\x1F\\x7F-\\x9F]/g, function(ch) { return '\\\\x'  + hex(ch); });\n    }\n\n    function describeExpectation(expectation) {\n      return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);\n    }\n\n    function describeExpected(expected) {\n      var descriptions = new Array(expected.length),\n          i, j;\n\n      for (i = 0; i < expected.length; i++) {\n        descriptions[i] = describeExpectation(expected[i]);\n      }\n\n      descriptions.sort();\n\n      if (descriptions.length > 0) {\n        for (i = 1, j = 1; i < descriptions.length; i++) {\n          if (descriptions[i - 1] !== descriptions[i]) {\n            descriptions[j] = descriptions[i];\n            j++;\n          }\n        }\n        descriptions.length = j;\n      }\n\n      switch (descriptions.length) {\n        case 1:\n          return descriptions[0];\n\n        case 2:\n          return descriptions[0] + \" or \" + descriptions[1];\n\n        default:\n          return descriptions.slice(0, -1).join(\", \")\n            + \", or \"\n            + descriptions[descriptions.length - 1];\n      }\n    }\n\n    function describeFound(found) {\n      return found ? \"\\\"\" + literalEscape(found) + \"\\\"\" : \"end of input\";\n    }\n\n    return \"Expected \" + describeExpected(expected) + \" but \" + describeFound(found) + \" found.\";\n  };\n\n  function peg$parse(input, options) {\n    options = options !== void 0 ? options : {};\n\n    var peg$FAILED = {},\n\n        peg$startRuleFunctions = { start: peg$parsestart },\n        peg$startRuleFunction  = peg$parsestart,\n\n        peg$c0 = function(ss) {\n            return ss.length === 1 ? ss[0] : { type: 'matches', selectors: ss };\n          },\n        peg$c1 = function() { return void 0; },\n        peg$c2 = \" \",\n        peg$c3 = peg$literalExpectation(\" \", false),\n        peg$c4 = /^[^ [\\],():#!=><~+.]/,\n        peg$c5 = peg$classExpectation([\" \", \"[\", \"]\", \",\", \"(\", \")\", \":\", \"#\", \"!\", \"=\", \">\", \"<\", \"~\", \"+\", \".\"], true, false),\n        peg$c6 = function(i) { return i.join(''); },\n        peg$c7 = \">\",\n        peg$c8 = peg$literalExpectation(\">\", false),\n        peg$c9 = function() { return 'child'; },\n        peg$c10 = \"~\",\n        peg$c11 = peg$literalExpectation(\"~\", false),\n        peg$c12 = function() { return 'sibling'; },\n        peg$c13 = \"+\",\n        peg$c14 = peg$literalExpectation(\"+\", false),\n        peg$c15 = function() { return 'adjacent'; },\n        peg$c16 = function() { return 'descendant'; },\n        peg$c17 = \",\",\n        peg$c18 = peg$literalExpectation(\",\", false),\n        peg$c19 = function(s, ss) {\n          return [s].concat(ss.map(function (s) { return s[3]; }));\n        },\n        peg$c20 = function(op, s) {\n            if (!op) return s;\n            return { type: op, left: { type: 'exactNode' }, right: s };\n          },\n        peg$c21 = function(a, ops) {\n            return ops.reduce(function (memo, rhs) {\n              return { type: rhs[0], left: memo, right: rhs[1] };\n            }, a);\n          },\n        peg$c22 = \"!\",\n        peg$c23 = peg$literalExpectation(\"!\", false),\n        peg$c24 = function(subject, as) {\n            const b = as.length === 1 ? as[0] : { type: 'compound', selectors: as };\n            if(subject) b.subject = true;\n            return b;\n          },\n        peg$c25 = \"*\",\n        peg$c26 = peg$literalExpectation(\"*\", false),\n        peg$c27 = function(a) { return { type: 'wildcard', value: a }; },\n        peg$c28 = \"#\",\n        peg$c29 = peg$literalExpectation(\"#\", false),\n        peg$c30 = function(i) { return { type: 'identifier', value: i }; },\n        peg$c31 = \"[\",\n        peg$c32 = peg$literalExpectation(\"[\", false),\n        peg$c33 = \"]\",\n        peg$c34 = peg$literalExpectation(\"]\", false),\n        peg$c35 = function(v) { return v; },\n        peg$c36 = /^[><!]/,\n        peg$c37 = peg$classExpectation([\">\", \"<\", \"!\"], false, false),\n        peg$c38 = \"=\",\n        peg$c39 = peg$literalExpectation(\"=\", false),\n        peg$c40 = function(a) { return (a || '') + '='; },\n        peg$c41 = /^[><]/,\n        peg$c42 = peg$classExpectation([\">\", \"<\"], false, false),\n        peg$c43 = \".\",\n        peg$c44 = peg$literalExpectation(\".\", false),\n        peg$c45 = function(a, as) {\n            return [].concat.apply([a], as).join('');\n          },\n        peg$c46 = function(name, op, value) {\n              return { type: 'attribute', name: name, operator: op, value: value };\n            },\n        peg$c47 = function(name) { return { type: 'attribute', name: name }; },\n        peg$c48 = \"\\\"\",\n        peg$c49 = peg$literalExpectation(\"\\\"\", false),\n        peg$c50 = /^[^\\\\\"]/,\n        peg$c51 = peg$classExpectation([\"\\\\\", \"\\\"\"], true, false),\n        peg$c52 = \"\\\\\",\n        peg$c53 = peg$literalExpectation(\"\\\\\", false),\n        peg$c54 = peg$anyExpectation(),\n        peg$c55 = function(a, b) { return a + b; },\n        peg$c56 = function(d) {\n                return { type: 'literal', value: strUnescape(d.join('')) };\n              },\n        peg$c57 = \"'\",\n        peg$c58 = peg$literalExpectation(\"'\", false),\n        peg$c59 = /^[^\\\\']/,\n        peg$c60 = peg$classExpectation([\"\\\\\", \"'\"], true, false),\n        peg$c61 = /^[0-9]/,\n        peg$c62 = peg$classExpectation([[\"0\", \"9\"]], false, false),\n        peg$c63 = function(a, b) {\n                // Can use `a.flat().join('')` once supported\n                const leadingDecimals = a ? [].concat.apply([], a).join('') : '';\n                return { type: 'literal', value: parseFloat(leadingDecimals + b.join('')) };\n              },\n        peg$c64 = function(i) { return { type: 'literal', value: i }; },\n        peg$c65 = \"type(\",\n        peg$c66 = peg$literalExpectation(\"type(\", false),\n        peg$c67 = /^[^ )]/,\n        peg$c68 = peg$classExpectation([\" \", \")\"], true, false),\n        peg$c69 = \")\",\n        peg$c70 = peg$literalExpectation(\")\", false),\n        peg$c71 = function(t) { return { type: 'type', value: t.join('') }; },\n        peg$c72 = /^[imsu]/,\n        peg$c73 = peg$classExpectation([\"i\", \"m\", \"s\", \"u\"], false, false),\n        peg$c74 = \"/\",\n        peg$c75 = peg$literalExpectation(\"/\", false),\n        peg$c76 = function(pattern, flgs) {\n              return {\n                type: 'regexp', value: new RegExp(pattern.join(''), flgs ? flgs.join('') : '')\n              };\n            },\n        peg$c77 = /^[^\\]\\\\]/,\n        peg$c78 = peg$classExpectation([\"]\", \"\\\\\"], true, false),\n        peg$c79 = function(cs) { return '[' + cs.join('') + ']'; },\n        peg$c80 = function(a) { return '\\\\' + a; },\n        peg$c81 = /^[^\\/\\\\[]/,\n        peg$c82 = peg$classExpectation([\"/\", \"\\\\\", \"[\"], true, false),\n        peg$c83 = function(cs) { return cs.join(''); },\n        peg$c84 = function(i, is) {\n          return { type: 'field', name: is.reduce(function(memo, p){ return memo + p[0] + p[1]; }, i)};\n        },\n        peg$c85 = \":not(\",\n        peg$c86 = peg$literalExpectation(\":not(\", false),\n        peg$c87 = function(ss) { return { type: 'not', selectors: ss }; },\n        peg$c88 = \":matches(\",\n        peg$c89 = peg$literalExpectation(\":matches(\", false),\n        peg$c90 = function(ss) { return { type: 'matches', selectors: ss }; },\n        peg$c91 = \":is(\",\n        peg$c92 = peg$literalExpectation(\":is(\", false),\n        peg$c93 = \":has(\",\n        peg$c94 = peg$literalExpectation(\":has(\", false),\n        peg$c95 = function(ss) { return { type: 'has', selectors: ss }; },\n        peg$c96 = \":first-child\",\n        peg$c97 = peg$literalExpectation(\":first-child\", false),\n        peg$c98 = function() { return nth(1); },\n        peg$c99 = \":last-child\",\n        peg$c100 = peg$literalExpectation(\":last-child\", false),\n        peg$c101 = function() { return nthLast(1); },\n        peg$c102 = \":nth-child(\",\n        peg$c103 = peg$literalExpectation(\":nth-child(\", false),\n        peg$c104 = function(n) { return nth(parseInt(n.join(''), 10)); },\n        peg$c105 = \":nth-last-child(\",\n        peg$c106 = peg$literalExpectation(\":nth-last-child(\", false),\n        peg$c107 = function(n) { return nthLast(parseInt(n.join(''), 10)); },\n        peg$c108 = \":\",\n        peg$c109 = peg$literalExpectation(\":\", false),\n        peg$c110 = function(c) {\n          return { type: 'class', name: c };\n        },\n\n        peg$currPos          = 0,\n        peg$savedPos         = 0,\n        peg$posDetailsCache  = [{ line: 1, column: 1 }],\n        peg$maxFailPos       = 0,\n        peg$maxFailExpected  = [],\n        peg$silentFails      = 0,\n\n        peg$resultsCache = {},\n\n        peg$result;\n\n    if (\"startRule\" in options) {\n      if (!(options.startRule in peg$startRuleFunctions)) {\n        throw new Error(\"Can't start parsing from rule \\\"\" + options.startRule + \"\\\".\");\n      }\n\n      peg$startRuleFunction = peg$startRuleFunctions[options.startRule];\n    }\n\n    function text() {\n      return input.substring(peg$savedPos, peg$currPos);\n    }\n\n    function location() {\n      return peg$computeLocation(peg$savedPos, peg$currPos);\n    }\n\n    function expected(description, location) {\n      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)\n\n      throw peg$buildStructuredError(\n        [peg$otherExpectation(description)],\n        input.substring(peg$savedPos, peg$currPos),\n        location\n      );\n    }\n\n    function error(message, location) {\n      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)\n\n      throw peg$buildSimpleError(message, location);\n    }\n\n    function peg$literalExpectation(text, ignoreCase) {\n      return { type: \"literal\", text: text, ignoreCase: ignoreCase };\n    }\n\n    function peg$classExpectation(parts, inverted, ignoreCase) {\n      return { type: \"class\", parts: parts, inverted: inverted, ignoreCase: ignoreCase };\n    }\n\n    function peg$anyExpectation() {\n      return { type: \"any\" };\n    }\n\n    function peg$endExpectation() {\n      return { type: \"end\" };\n    }\n\n    function peg$otherExpectation(description) {\n      return { type: \"other\", description: description };\n    }\n\n    function peg$computePosDetails(pos) {\n      var details = peg$posDetailsCache[pos], p;\n\n      if (details) {\n        return details;\n      } else {\n        p = pos - 1;\n        while (!peg$posDetailsCache[p]) {\n          p--;\n        }\n\n        details = peg$posDetailsCache[p];\n        details = {\n          line:   details.line,\n          column: details.column\n        };\n\n        while (p < pos) {\n          if (input.charCodeAt(p) === 10) {\n            details.line++;\n            details.column = 1;\n          } else {\n            details.column++;\n          }\n\n          p++;\n        }\n\n        peg$posDetailsCache[pos] = details;\n        return details;\n      }\n    }\n\n    function peg$computeLocation(startPos, endPos) {\n      var startPosDetails = peg$computePosDetails(startPos),\n          endPosDetails   = peg$computePosDetails(endPos);\n\n      return {\n        start: {\n          offset: startPos,\n          line:   startPosDetails.line,\n          column: startPosDetails.column\n        },\n        end: {\n          offset: endPos,\n          line:   endPosDetails.line,\n          column: endPosDetails.column\n        }\n      };\n    }\n\n    function peg$fail(expected) {\n      if (peg$currPos < peg$maxFailPos) { return; }\n\n      if (peg$currPos > peg$maxFailPos) {\n        peg$maxFailPos = peg$currPos;\n        peg$maxFailExpected = [];\n      }\n\n      peg$maxFailExpected.push(expected);\n    }\n\n    function peg$buildSimpleError(message, location) {\n      return new peg$SyntaxError(message, null, null, location);\n    }\n\n    function peg$buildStructuredError(expected, found, location) {\n      return new peg$SyntaxError(\n        peg$SyntaxError.buildMessage(expected, found),\n        expected,\n        found,\n        location\n      );\n    }\n\n    function peg$parsestart() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 0,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parse_();\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseselectors();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parse_();\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c0(s2);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        s1 = peg$parse_();\n        if (s1 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c1();\n        }\n        s0 = s1;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parse_() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 1,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = [];\n      if (input.charCodeAt(peg$currPos) === 32) {\n        s1 = peg$c2;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c3); }\n      }\n      while (s1 !== peg$FAILED) {\n        s0.push(s1);\n        if (input.charCodeAt(peg$currPos) === 32) {\n          s1 = peg$c2;\n          peg$currPos++;\n        } else {\n          s1 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c3); }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseidentifierName() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 2,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = [];\n      if (peg$c4.test(input.charAt(peg$currPos))) {\n        s2 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s2 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c5); }\n      }\n      if (s2 !== peg$FAILED) {\n        while (s2 !== peg$FAILED) {\n          s1.push(s2);\n          if (peg$c4.test(input.charAt(peg$currPos))) {\n            s2 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s2 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c5); }\n          }\n        }\n      } else {\n        s1 = peg$FAILED;\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c6(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsebinaryOp() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 3,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parse_();\n      if (s1 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 62) {\n          s2 = peg$c7;\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c8); }\n        }\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parse_();\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c9();\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        s1 = peg$parse_();\n        if (s1 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 126) {\n            s2 = peg$c10;\n            peg$currPos++;\n          } else {\n            s2 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c11); }\n          }\n          if (s2 !== peg$FAILED) {\n            s3 = peg$parse_();\n            if (s3 !== peg$FAILED) {\n              peg$savedPos = s0;\n              s1 = peg$c12();\n              s0 = s1;\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n        if (s0 === peg$FAILED) {\n          s0 = peg$currPos;\n          s1 = peg$parse_();\n          if (s1 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 43) {\n              s2 = peg$c13;\n              peg$currPos++;\n            } else {\n              s2 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c14); }\n            }\n            if (s2 !== peg$FAILED) {\n              s3 = peg$parse_();\n              if (s3 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c15();\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n          if (s0 === peg$FAILED) {\n            s0 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 32) {\n              s1 = peg$c2;\n              peg$currPos++;\n            } else {\n              s1 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c3); }\n            }\n            if (s1 !== peg$FAILED) {\n              s2 = peg$parse_();\n              if (s2 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c16();\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsehasSelectors() {\n      var s0, s1, s2, s3, s4, s5, s6, s7;\n\n      var key    = peg$currPos * 36 + 4,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parsehasSelector();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        s4 = peg$parse_();\n        if (s4 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 44) {\n            s5 = peg$c17;\n            peg$currPos++;\n          } else {\n            s5 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c18); }\n          }\n          if (s5 !== peg$FAILED) {\n            s6 = peg$parse_();\n            if (s6 !== peg$FAILED) {\n              s7 = peg$parsehasSelector();\n              if (s7 !== peg$FAILED) {\n                s4 = [s4, s5, s6, s7];\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          s4 = peg$parse_();\n          if (s4 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 44) {\n              s5 = peg$c17;\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c18); }\n            }\n            if (s5 !== peg$FAILED) {\n              s6 = peg$parse_();\n              if (s6 !== peg$FAILED) {\n                s7 = peg$parsehasSelector();\n                if (s7 !== peg$FAILED) {\n                  s4 = [s4, s5, s6, s7];\n                  s3 = s4;\n                } else {\n                  peg$currPos = s3;\n                  s3 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c19(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseselectors() {\n      var s0, s1, s2, s3, s4, s5, s6, s7;\n\n      var key    = peg$currPos * 36 + 5,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseselector();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        s4 = peg$parse_();\n        if (s4 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 44) {\n            s5 = peg$c17;\n            peg$currPos++;\n          } else {\n            s5 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c18); }\n          }\n          if (s5 !== peg$FAILED) {\n            s6 = peg$parse_();\n            if (s6 !== peg$FAILED) {\n              s7 = peg$parseselector();\n              if (s7 !== peg$FAILED) {\n                s4 = [s4, s5, s6, s7];\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          s4 = peg$parse_();\n          if (s4 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 44) {\n              s5 = peg$c17;\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c18); }\n            }\n            if (s5 !== peg$FAILED) {\n              s6 = peg$parse_();\n              if (s6 !== peg$FAILED) {\n                s7 = peg$parseselector();\n                if (s7 !== peg$FAILED) {\n                  s4 = [s4, s5, s6, s7];\n                  s3 = s4;\n                } else {\n                  peg$currPos = s3;\n                  s3 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c19(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsehasSelector() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 6,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parsebinaryOp();\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseselector();\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c20(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseselector() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 7,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parsesequence();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        s4 = peg$parsebinaryOp();\n        if (s4 !== peg$FAILED) {\n          s5 = peg$parsesequence();\n          if (s5 !== peg$FAILED) {\n            s4 = [s4, s5];\n            s3 = s4;\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          s4 = peg$parsebinaryOp();\n          if (s4 !== peg$FAILED) {\n            s5 = peg$parsesequence();\n            if (s5 !== peg$FAILED) {\n              s4 = [s4, s5];\n              s3 = s4;\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c21(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsesequence() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 8,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 33) {\n        s1 = peg$c22;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c23); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$parseatom();\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            s3 = peg$parseatom();\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c24(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseatom() {\n      var s0;\n\n      var key    = peg$currPos * 36 + 9,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$parsewildcard();\n      if (s0 === peg$FAILED) {\n        s0 = peg$parseidentifier();\n        if (s0 === peg$FAILED) {\n          s0 = peg$parseattr();\n          if (s0 === peg$FAILED) {\n            s0 = peg$parsefield();\n            if (s0 === peg$FAILED) {\n              s0 = peg$parsenegation();\n              if (s0 === peg$FAILED) {\n                s0 = peg$parsematches();\n                if (s0 === peg$FAILED) {\n                  s0 = peg$parseis();\n                  if (s0 === peg$FAILED) {\n                    s0 = peg$parsehas();\n                    if (s0 === peg$FAILED) {\n                      s0 = peg$parsefirstChild();\n                      if (s0 === peg$FAILED) {\n                        s0 = peg$parselastChild();\n                        if (s0 === peg$FAILED) {\n                          s0 = peg$parsenthChild();\n                          if (s0 === peg$FAILED) {\n                            s0 = peg$parsenthLastChild();\n                            if (s0 === peg$FAILED) {\n                              s0 = peg$parseclass();\n                            }\n                          }\n                        }\n                      }\n                    }\n                  }\n                }\n              }\n            }\n          }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsewildcard() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 10,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 42) {\n        s1 = peg$c25;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c26); }\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c27(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseidentifier() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 11,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 35) {\n        s1 = peg$c28;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c29); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseidentifierName();\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c30(s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattr() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 12,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 91) {\n        s1 = peg$c31;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c32); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseattrValue();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 93) {\n                s5 = peg$c33;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c34); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c35(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrOps() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 13,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (peg$c36.test(input.charAt(peg$currPos))) {\n        s1 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c37); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 61) {\n          s2 = peg$c38;\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c39); }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c40(s1);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        if (peg$c41.test(input.charAt(peg$currPos))) {\n          s0 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s0 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c42); }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrEqOps() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 14,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 33) {\n        s1 = peg$c22;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c23); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 61) {\n          s2 = peg$c38;\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c39); }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c40(s1);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrName() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 15,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseidentifierName();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        if (input.charCodeAt(peg$currPos) === 46) {\n          s4 = peg$c43;\n          peg$currPos++;\n        } else {\n          s4 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c44); }\n        }\n        if (s4 !== peg$FAILED) {\n          s5 = peg$parseidentifierName();\n          if (s5 !== peg$FAILED) {\n            s4 = [s4, s5];\n            s3 = s4;\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          if (input.charCodeAt(peg$currPos) === 46) {\n            s4 = peg$c43;\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c44); }\n          }\n          if (s4 !== peg$FAILED) {\n            s5 = peg$parseidentifierName();\n            if (s5 !== peg$FAILED) {\n              s4 = [s4, s5];\n              s3 = s4;\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c45(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrValue() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 16,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseattrName();\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseattrEqOps();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              s5 = peg$parsetype();\n              if (s5 === peg$FAILED) {\n                s5 = peg$parseregex();\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c46(s1, s3, s5);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        s1 = peg$parseattrName();\n        if (s1 !== peg$FAILED) {\n          s2 = peg$parse_();\n          if (s2 !== peg$FAILED) {\n            s3 = peg$parseattrOps();\n            if (s3 !== peg$FAILED) {\n              s4 = peg$parse_();\n              if (s4 !== peg$FAILED) {\n                s5 = peg$parsestring();\n                if (s5 === peg$FAILED) {\n                  s5 = peg$parsenumber();\n                  if (s5 === peg$FAILED) {\n                    s5 = peg$parsepath();\n                  }\n                }\n                if (s5 !== peg$FAILED) {\n                  peg$savedPos = s0;\n                  s1 = peg$c46(s1, s3, s5);\n                  s0 = s1;\n                } else {\n                  peg$currPos = s0;\n                  s0 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n        if (s0 === peg$FAILED) {\n          s0 = peg$currPos;\n          s1 = peg$parseattrName();\n          if (s1 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c47(s1);\n          }\n          s0 = s1;\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsestring() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 17,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 34) {\n        s1 = peg$c48;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c49); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        if (peg$c50.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c51); }\n        }\n        if (s3 === peg$FAILED) {\n          s3 = peg$currPos;\n          if (input.charCodeAt(peg$currPos) === 92) {\n            s4 = peg$c52;\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c53); }\n          }\n          if (s4 !== peg$FAILED) {\n            if (input.length > peg$currPos) {\n              s5 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c54); }\n            }\n            if (s5 !== peg$FAILED) {\n              peg$savedPos = s3;\n              s4 = peg$c55(s4, s5);\n              s3 = s4;\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          if (peg$c50.test(input.charAt(peg$currPos))) {\n            s3 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c51); }\n          }\n          if (s3 === peg$FAILED) {\n            s3 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 92) {\n              s4 = peg$c52;\n              peg$currPos++;\n            } else {\n              s4 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c53); }\n            }\n            if (s4 !== peg$FAILED) {\n              if (input.length > peg$currPos) {\n                s5 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c54); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s3;\n                s4 = peg$c55(s4, s5);\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 34) {\n            s3 = peg$c48;\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c49); }\n          }\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c56(s2);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        if (input.charCodeAt(peg$currPos) === 39) {\n          s1 = peg$c57;\n          peg$currPos++;\n        } else {\n          s1 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c58); }\n        }\n        if (s1 !== peg$FAILED) {\n          s2 = [];\n          if (peg$c59.test(input.charAt(peg$currPos))) {\n            s3 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c60); }\n          }\n          if (s3 === peg$FAILED) {\n            s3 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 92) {\n              s4 = peg$c52;\n              peg$currPos++;\n            } else {\n              s4 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c53); }\n            }\n            if (s4 !== peg$FAILED) {\n              if (input.length > peg$currPos) {\n                s5 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c54); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s3;\n                s4 = peg$c55(s4, s5);\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          }\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            if (peg$c59.test(input.charAt(peg$currPos))) {\n              s3 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c60); }\n            }\n            if (s3 === peg$FAILED) {\n              s3 = peg$currPos;\n              if (input.charCodeAt(peg$currPos) === 92) {\n                s4 = peg$c52;\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c53); }\n              }\n              if (s4 !== peg$FAILED) {\n                if (input.length > peg$currPos) {\n                  s5 = input.charAt(peg$currPos);\n                  peg$currPos++;\n                } else {\n                  s5 = peg$FAILED;\n                  if (peg$silentFails === 0) { peg$fail(peg$c54); }\n                }\n                if (s5 !== peg$FAILED) {\n                  peg$savedPos = s3;\n                  s4 = peg$c55(s4, s5);\n                  s3 = s4;\n                } else {\n                  peg$currPos = s3;\n                  s3 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            }\n          }\n          if (s2 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 39) {\n              s3 = peg$c57;\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c58); }\n            }\n            if (s3 !== peg$FAILED) {\n              peg$savedPos = s0;\n              s1 = peg$c56(s2);\n              s0 = s1;\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenumber() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 18,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$currPos;\n      s2 = [];\n      if (peg$c61.test(input.charAt(peg$currPos))) {\n        s3 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s3 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c62); }\n      }\n      while (s3 !== peg$FAILED) {\n        s2.push(s3);\n        if (peg$c61.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c62); }\n        }\n      }\n      if (s2 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 46) {\n          s3 = peg$c43;\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c44); }\n        }\n        if (s3 !== peg$FAILED) {\n          s2 = [s2, s3];\n          s1 = s2;\n        } else {\n          peg$currPos = s1;\n          s1 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s1;\n        s1 = peg$FAILED;\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        if (peg$c61.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c62); }\n        }\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            if (peg$c61.test(input.charAt(peg$currPos))) {\n              s3 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c62); }\n            }\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c63(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsepath() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 19,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseidentifierName();\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c64(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsetype() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 20,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 5) === peg$c65) {\n        s1 = peg$c65;\n        peg$currPos += 5;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c66); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          if (peg$c67.test(input.charAt(peg$currPos))) {\n            s4 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c68); }\n          }\n          if (s4 !== peg$FAILED) {\n            while (s4 !== peg$FAILED) {\n              s3.push(s4);\n              if (peg$c67.test(input.charAt(peg$currPos))) {\n                s4 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c68); }\n              }\n            }\n          } else {\n            s3 = peg$FAILED;\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c71(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseflags() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 21,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = [];\n      if (peg$c72.test(input.charAt(peg$currPos))) {\n        s1 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c73); }\n      }\n      if (s1 !== peg$FAILED) {\n        while (s1 !== peg$FAILED) {\n          s0.push(s1);\n          if (peg$c72.test(input.charAt(peg$currPos))) {\n            s1 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s1 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c73); }\n          }\n        }\n      } else {\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseregex() {\n      var s0, s1, s2, s3, s4;\n\n      var key    = peg$currPos * 36 + 22,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 47) {\n        s1 = peg$c74;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c75); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$parsere_character_class();\n        if (s3 === peg$FAILED) {\n          s3 = peg$parsere_escape();\n          if (s3 === peg$FAILED) {\n            s3 = peg$parsere_chars();\n          }\n        }\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            s3 = peg$parsere_character_class();\n            if (s3 === peg$FAILED) {\n              s3 = peg$parsere_escape();\n              if (s3 === peg$FAILED) {\n                s3 = peg$parsere_chars();\n              }\n            }\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 47) {\n            s3 = peg$c74;\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c75); }\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parseflags();\n            if (s4 === peg$FAILED) {\n              s4 = null;\n            }\n            if (s4 !== peg$FAILED) {\n              peg$savedPos = s0;\n              s1 = peg$c76(s2, s4);\n              s0 = s1;\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsere_character_class() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 36 + 23,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 91) {\n        s1 = peg$c31;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c32); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        if (peg$c77.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c78); }\n        }\n        if (s3 === peg$FAILED) {\n          s3 = peg$parsere_escape();\n        }\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            if (peg$c77.test(input.charAt(peg$currPos))) {\n              s3 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c78); }\n            }\n            if (s3 === peg$FAILED) {\n              s3 = peg$parsere_escape();\n            }\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 93) {\n            s3 = peg$c33;\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c34); }\n          }\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c79(s2);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsere_escape() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 24,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 92) {\n        s1 = peg$c52;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c53); }\n      }\n      if (s1 !== peg$FAILED) {\n        if (input.length > peg$currPos) {\n          s2 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c54); }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c80(s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsere_chars() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 25,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = [];\n      if (peg$c81.test(input.charAt(peg$currPos))) {\n        s2 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s2 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c82); }\n      }\n      if (s2 !== peg$FAILED) {\n        while (s2 !== peg$FAILED) {\n          s1.push(s2);\n          if (peg$c81.test(input.charAt(peg$currPos))) {\n            s2 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s2 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c82); }\n          }\n        }\n      } else {\n        s1 = peg$FAILED;\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c83(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsefield() {\n      var s0, s1, s2, s3, s4, s5, s6;\n\n      var key    = peg$currPos * 36 + 26,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 46) {\n        s1 = peg$c43;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c44); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseidentifierName();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          s4 = peg$currPos;\n          if (input.charCodeAt(peg$currPos) === 46) {\n            s5 = peg$c43;\n            peg$currPos++;\n          } else {\n            s5 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c44); }\n          }\n          if (s5 !== peg$FAILED) {\n            s6 = peg$parseidentifierName();\n            if (s6 !== peg$FAILED) {\n              s5 = [s5, s6];\n              s4 = s5;\n            } else {\n              peg$currPos = s4;\n              s4 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s4;\n            s4 = peg$FAILED;\n          }\n          while (s4 !== peg$FAILED) {\n            s3.push(s4);\n            s4 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 46) {\n              s5 = peg$c43;\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c44); }\n            }\n            if (s5 !== peg$FAILED) {\n              s6 = peg$parseidentifierName();\n              if (s6 !== peg$FAILED) {\n                s5 = [s5, s6];\n                s4 = s5;\n              } else {\n                peg$currPos = s4;\n                s4 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s4;\n              s4 = peg$FAILED;\n            }\n          }\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c84(s2, s3);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenegation() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 27,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 5) === peg$c85) {\n        s1 = peg$c85;\n        peg$currPos += 5;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c86); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseselectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c87(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsematches() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 28,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 9) === peg$c88) {\n        s1 = peg$c88;\n        peg$currPos += 9;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c89); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseselectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c90(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseis() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 29,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 4) === peg$c91) {\n        s1 = peg$c91;\n        peg$currPos += 4;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c92); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseselectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c90(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsehas() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 30,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 5) === peg$c93) {\n        s1 = peg$c93;\n        peg$currPos += 5;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c94); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parsehasSelectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c95(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsefirstChild() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 31,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 12) === peg$c96) {\n        s1 = peg$c96;\n        peg$currPos += 12;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c97); }\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c98();\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parselastChild() {\n      var s0, s1;\n\n      var key    = peg$currPos * 36 + 32,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 11) === peg$c99) {\n        s1 = peg$c99;\n        peg$currPos += 11;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c100); }\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c101();\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenthChild() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 33,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 11) === peg$c102) {\n        s1 = peg$c102;\n        peg$currPos += 11;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c103); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          if (peg$c61.test(input.charAt(peg$currPos))) {\n            s4 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c62); }\n          }\n          if (s4 !== peg$FAILED) {\n            while (s4 !== peg$FAILED) {\n              s3.push(s4);\n              if (peg$c61.test(input.charAt(peg$currPos))) {\n                s4 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c62); }\n              }\n            }\n          } else {\n            s3 = peg$FAILED;\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c104(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenthLastChild() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 36 + 34,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 16) === peg$c105) {\n        s1 = peg$c105;\n        peg$currPos += 16;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c106); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          if (peg$c61.test(input.charAt(peg$currPos))) {\n            s4 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c62); }\n          }\n          if (s4 !== peg$FAILED) {\n            while (s4 !== peg$FAILED) {\n              s3.push(s4);\n              if (peg$c61.test(input.charAt(peg$currPos))) {\n                s4 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c62); }\n              }\n            }\n          } else {\n            s3 = peg$FAILED;\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c107(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseclass() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 36 + 35,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 58) {\n        s1 = peg$c108;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c109); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseidentifierName();\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c110(s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n\n      function nth(n) { return { type: 'nth-child', index: { type: 'literal', value: n } }; }\n      function nthLast(n) { return { type: 'nth-last-child', index: { type: 'literal', value: n } }; }\n      function strUnescape(s) {\n        return s.replace(/\\\\(.)/g, function(match, ch) {\n          switch(ch) {\n            case 'b': return '\\b';\n            case 'f': return '\\f';\n            case 'n': return '\\n';\n            case 'r': return '\\r';\n            case 't': return '\\t';\n            case 'v': return '\\v';\n            default: return ch;\n          }\n        });\n      }\n\n\n    peg$result = peg$startRuleFunction();\n\n    if (peg$result !== peg$FAILED && peg$currPos === input.length) {\n      return peg$result;\n    } else {\n      if (peg$result !== peg$FAILED && peg$currPos < input.length) {\n        peg$fail(peg$endExpectation());\n      }\n\n      throw peg$buildStructuredError(\n        peg$maxFailExpected,\n        peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,\n        peg$maxFailPos < input.length\n          ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)\n          : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)\n      );\n    }\n  }\n\n  return {\n    SyntaxError: peg$SyntaxError,\n    parse:       peg$parse\n  };\n});\n","/* vim: set sw=4 sts=4 : */\nimport estraverse from 'estraverse';\nimport parser from './parser.js';\n\n/**\n* @typedef {\"LEFT_SIDE\"|\"RIGHT_SIDE\"} Side\n*/\n\nconst LEFT_SIDE = 'LEFT_SIDE';\nconst RIGHT_SIDE = 'RIGHT_SIDE';\n\n/**\n * @external AST\n * @see https://esprima.readthedocs.io/en/latest/syntax-tree-format.html\n */\n\n/**\n * One of the rules of `grammar.pegjs`\n * @typedef {PlainObject} SelectorAST\n * @see grammar.pegjs\n*/\n\n/**\n * The `sequence` production of `grammar.pegjs`\n * @typedef {PlainObject} SelectorSequenceAST\n*/\n\n/**\n * Get the value of a property which may be multiple levels down\n * in the object.\n * @param {?PlainObject} obj\n * @param {string[]} keys\n * @returns {undefined|boolean|string|number|external:AST}\n */\nfunction getPath(obj, keys) {\n    for (let i = 0; i < keys.length; ++i) {\n        if (obj == null) { return obj; }\n        obj = obj[keys[i]];\n    }\n    return obj;\n}\n\n/**\n * Determine whether `node` can be reached by following `path`,\n * starting at `ancestor`.\n * @param {?external:AST} node\n * @param {?external:AST} ancestor\n * @param {string[]} path\n * @param {Integer} fromPathIndex\n * @returns {boolean}\n */\nfunction inPath(node, ancestor, path, fromPathIndex) {\n    let current = ancestor;\n    for (let i = fromPathIndex; i < path.length; ++i) {\n        if (current == null) {\n            return false;\n        }\n        const field = current[path[i]];\n        if (Array.isArray(field)) {\n            for (let k = 0; k < field.length; ++k) {\n                if (inPath(node, field[k], path, i + 1)) {\n                    return true;\n                }\n            }\n            return false;\n        }\n        current = field;\n    }\n    return node === current;\n}\n\n/**\n * A generated matcher function for a selector.\n * @callback SelectorMatcher\n * @param {?SelectorAST} selector\n * @param {external:AST[]} [ancestry=[]]\n * @param {ESQueryOptions} [options]\n * @returns {void}\n*/\n\n/**\n * A WeakMap for holding cached matcher functions for selectors.\n * @type {WeakMap<SelectorAST, SelectorMatcher>}\n*/\nconst MATCHER_CACHE = typeof WeakMap === 'function' ? new WeakMap : null;\n\n/**\n * Look up a matcher function for `selector` in the cache.\n * If it does not exist, generate it with `generateMatcher` and add it to the cache.\n * In engines without WeakMap, the caching is skipped and matchers are generated with every call.\n * @param {?SelectorAST} selector\n * @returns {SelectorMatcher}\n */\nfunction getMatcher(selector) {\n    if (selector == null) {\n        return () => true;\n    }\n\n    if (MATCHER_CACHE != null) {\n        let matcher = MATCHER_CACHE.get(selector);\n        if (matcher != null) {\n            return matcher;\n        }\n        matcher = generateMatcher(selector);\n        MATCHER_CACHE.set(selector, matcher);\n        return matcher;\n    }\n\n    return generateMatcher(selector);\n}\n\n/**\n * Create a matcher function for `selector`,\n * @param {?SelectorAST} selector\n * @returns {SelectorMatcher}\n */\nfunction generateMatcher(selector) {\n    switch(selector.type) {\n        case 'wildcard':\n            return () => true;\n\n        case 'identifier': {\n            const value = selector.value.toLowerCase();\n            return (node, ancestry, options) => {\n                const nodeTypeKey = (options && options.nodeTypeKey) || 'type';\n                return value === node[nodeTypeKey].toLowerCase();\n            };\n        }\n\n        case 'exactNode':\n            return (node, ancestry) => {\n                return ancestry.length === 0;\n            };\n\n        case 'field': {\n            const path = selector.name.split('.');\n            return (node, ancestry) => {\n                const ancestor = ancestry[path.length - 1];\n                return inPath(node, ancestor, path, 0);\n            };\n        }\n\n        case 'matches': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                for (let i = 0; i < matchers.length; ++i) {\n                    if (matchers[i](node, ancestry, options)) { return true; }\n                }\n                return false;\n            };\n        }\n\n        case 'compound': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                for (let i = 0; i < matchers.length; ++i) {\n                    if (!matchers[i](node, ancestry, options)) { return false; }\n                }\n                return true;\n            };\n        }\n\n        case 'not': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                for (let i = 0; i < matchers.length; ++i) {\n                    if (matchers[i](node, ancestry, options)) { return false; }\n                }\n                return true;\n            };\n        }\n\n        case 'has': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                let result = false;\n\n                const a = [];\n                estraverse.traverse(node, {\n                    enter (node, parent) {\n                        if (parent != null) { a.unshift(parent); }\n\n                        for (let i = 0; i < matchers.length; ++i) {\n                            if (matchers[i](node, a, options)) {\n                                result = true;\n                                this.break();\n                                return;\n                            }\n                        }\n                    },\n                    leave () { a.shift(); },\n                    keys: options && options.visitorKeys,\n                    fallback: options && options.fallback || 'iteration'\n                });\n\n                return result;\n            };\n        }\n\n        case 'child': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) => {\n                if (ancestry.length > 0 && right(node, ancestry, options)) {\n                    return left(ancestry[0], ancestry.slice(1), options);\n                }\n                return false;\n            };\n        }\n\n        case 'descendant': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) => {\n                if (right(node, ancestry, options)) {\n                    for (let i = 0, l = ancestry.length; i < l; ++i) {\n                        if (left(ancestry[i], ancestry.slice(i + 1), options)) {\n                            return true;\n                        }\n                    }\n                }\n                return false;\n            };\n        }\n\n        case 'attribute': {\n            const path = selector.name.split('.');\n            switch (selector.operator) {\n                case void 0:\n                    return (node) => getPath(node, path) != null;\n                case '=':\n                    switch (selector.value.type) {\n                        case 'regexp':\n                            return (node) => {\n                                const p = getPath(node, path);\n                                return typeof p === 'string' && selector.value.value.test(p);\n                            };\n                        case 'literal': {\n                            const literal = `${selector.value.value}`;\n                            return (node) => literal === `${getPath(node, path)}`;\n                        }\n                        case 'type':\n                            return (node) => selector.value.value === typeof getPath(node, path);\n                    }\n                    throw new Error(`Unknown selector value type: ${selector.value.type}`);\n                case '!=':\n                    switch (selector.value.type) {\n                        case 'regexp':\n                            return (node) => !selector.value.value.test(getPath(node, path));\n                        case 'literal': {\n                            const literal = `${selector.value.value}`;\n                            return (node) => literal !== `${getPath(node, path)}`;\n                        }\n                        case 'type':\n                            return (node) => selector.value.value !== typeof getPath(node, path);\n                    }\n                    throw new Error(`Unknown selector value type: ${selector.value.type}`);\n                case '<=':\n                    return (node) => getPath(node, path) <= selector.value.value;\n                case '<':\n                    return (node) => getPath(node, path) < selector.value.value;\n                case '>':\n                    return (node) => getPath(node, path) > selector.value.value;\n                case '>=':\n                    return (node) => getPath(node, path) >= selector.value.value;\n            }\n            throw new Error(`Unknown operator: ${selector.operator}`);\n        }\n\n        case 'sibling': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    sibling(node, left, ancestry, LEFT_SIDE, options) ||\n                    selector.left.subject &&\n                    left(node, ancestry, options) &&\n                    sibling(node, right, ancestry, RIGHT_SIDE, options);\n        }\n\n        case 'adjacent': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    adjacent(node, left, ancestry, LEFT_SIDE, options) ||\n                    selector.right.subject &&\n                    left(node, ancestry, options) &&\n                    adjacent(node, right, ancestry, RIGHT_SIDE, options);\n        }\n\n        case 'nth-child': {\n            const nth = selector.index.value;\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    nthChild(node, ancestry, nth, options);\n        }\n\n        case 'nth-last-child': {\n            const nth = -selector.index.value;\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    nthChild(node, ancestry, nth, options);\n        }\n\n        case 'class': {\n            \n            const name = selector.name.toLowerCase();\n\n            return (node, ancestry, options) => {\n                \n                if (options && options.matchClass) {\n                    return options.matchClass(selector.name, node, ancestry);\n                }\n                \n                if (options && options.nodeTypeKey) return false;    \n\n                switch(name){\n                    case 'statement':\n                        if(node.type.slice(-9) === 'Statement') return true;\n                        // fallthrough: interface Declaration <: Statement { }\n                    case 'declaration':\n                        return node.type.slice(-11) === 'Declaration';\n                    case 'pattern':\n                        if(node.type.slice(-7) === 'Pattern') return true;\n                        // fallthrough: interface Expression <: Node, Pattern { }\n                    case 'expression':\n                        return node.type.slice(-10) === 'Expression' ||\n                            node.type.slice(-7) === 'Literal' ||\n                            (\n                                node.type === 'Identifier' &&\n                                (ancestry.length === 0 || ancestry[0].type !== 'MetaProperty')\n                            ) ||\n                            node.type === 'MetaProperty';\n                    case 'function':\n                        return node.type === 'FunctionDeclaration' ||\n                            node.type === 'FunctionExpression' ||\n                            node.type === 'ArrowFunctionExpression';\n                }\n                throw new Error(`Unknown class name: ${selector.name}`);\n            };\n        }\n    }\n\n    throw new Error(`Unknown selector type: ${selector.type}`);\n}\n\n/**\n * @callback TraverseOptionFallback\n * @param {external:AST} node The given node.\n * @returns {string[]} An array of visitor keys for the given node.\n */\n\n/**\n * @callback ClassMatcher\n * @param {string} className The name of the class to match.\n * @param {external:AST} node The node to match against.\n * @param {Array<external:AST>} ancestry The ancestry of the node.\n * @returns {boolean} True if the node matches the class, false if not.\n */\n\n/**\n * @typedef {object} ESQueryOptions\n * @property {string} [nodeTypeKey=\"type\"] By passing `nodeTypeKey`, we can allow other ASTs to use ESQuery.\n * @property { { [nodeType: string]: string[] } } [visitorKeys] By passing `visitorKeys` mapping, we can extend the properties of the nodes that traverse the node.\n * @property {TraverseOptionFallback} [fallback] By passing `fallback` option, we can control the properties of traversing nodes when encountering unknown nodes.\n * @property {ClassMatcher} [matchClass] By passing `matchClass` option, we can customize the interpretation of classes.\n */\n\n/**\n * Given a `node` and its ancestors, determine if `node` is matched\n * by `selector`.\n * @param {?external:AST} node\n * @param {?SelectorAST} selector\n * @param {external:AST[]} [ancestry=[]]\n * @param {ESQueryOptions} [options]\n * @throws {Error} Unknowns (operator, class name, selector type, or\n * selector value type)\n * @returns {boolean}\n */\nfunction matches(node, selector, ancestry, options) {\n    if (!selector) { return true; }\n    if (!node) { return false; }\n    if (!ancestry) { ancestry = []; }\n\n    return getMatcher(selector)(node, ancestry, options);\n}\n\n/**\n * Get visitor keys of a given node.\n * @param {external:AST} node The AST node to get keys.\n * @param {ESQueryOptions|undefined} options\n * @returns {string[]} Visitor keys of the node.\n */\nfunction getVisitorKeys(node, options) {\n    const nodeTypeKey = (options && options.nodeTypeKey) || 'type';\n\n    const nodeType = node[nodeTypeKey];\n    if (options && options.visitorKeys && options.visitorKeys[nodeType]) {\n        return options.visitorKeys[nodeType];\n    }\n    if (estraverse.VisitorKeys[nodeType]) {\n        return estraverse.VisitorKeys[nodeType];\n    }\n    if (options && typeof options.fallback === 'function') {\n        return options.fallback(node);\n    }\n    // 'iteration' fallback\n    return Object.keys(node).filter(function (key) {\n        return key !== nodeTypeKey;\n    });\n}\n\n\n/**\n * Check whether the given value is an ASTNode or not.\n * @param {any} node The value to check.\n * @param {ESQueryOptions|undefined} options The options to use.\n * @returns {boolean} `true` if the value is an ASTNode.\n */\nfunction isNode(node, options) {\n    const nodeTypeKey = (options && options.nodeTypeKey) || 'type';\n    return node !== null && typeof node === 'object' && typeof node[nodeTypeKey] === 'string';\n}\n\n/**\n * Determines if the given node has a sibling that matches the\n * given selector matcher.\n * @param {external:AST} node\n * @param {SelectorMatcher} matcher\n * @param {external:AST[]} ancestry\n * @param {Side} side\n * @param {ESQueryOptions|undefined} options\n * @returns {boolean}\n */\nfunction sibling(node, matcher, ancestry, side, options) {\n    const [parent] = ancestry;\n    if (!parent) { return false; 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Index: frontend/node_modules/esquery/license.txt
===================================================================
--- frontend/node_modules/esquery/license.txt	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/license.txt	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,24 @@
+Copyright (c) 2013, Joel Feenstra
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of the ESQuery nor the names of its contributors may
+      be used to endorse or promote products derived from this software without
+      specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL JOEL FEENSTRA BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Index: frontend/node_modules/esquery/package.json
===================================================================
--- frontend/node_modules/esquery/package.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/package.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,78 @@
+{
+  "name": "esquery",
+  "version": "1.7.0",
+  "author": "Joel Feenstra <jrfeenst+esquery@gmail.com>",
+  "contributors": [],
+  "description": "A query library for ECMAScript AST using a CSS selector like query language.",
+  "main": "dist/esquery.min.js",
+  "module": "dist/esquery.esm.min.js",
+  "files": [
+    "dist/*.js",
+    "dist/*.map",
+    "parser.js",
+    "license.txt",
+    "README.md"
+  ],
+  "nyc": {
+    "branches": 100,
+    "lines": 100,
+    "functions": 100,
+    "statements": 100,
+    "reporter": [
+      "html",
+      "text"
+    ],
+    "exclude": [
+      "parser.js",
+      "dist",
+      "tests"
+    ]
+  },
+  "scripts": {
+    "prepublishOnly": "npm run build && npm test",
+    "build:parser": "rm parser.js && pegjs --cache --format umd -o \"parser.js\" \"grammar.pegjs\"",
+    "build:browser": "rollup -c",
+    "build": "npm run build:parser && npm run build:browser",
+    "mocha": "mocha --require chai/register-assert --require @babel/register tests",
+    "test": "nyc npm run mocha && npm run lint",
+    "test:ci": "npm run mocha",
+    "lint": "eslint ."
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/estools/esquery.git"
+  },
+  "bugs": "https://github.com/estools/esquery/issues",
+  "homepage": "https://github.com/estools/esquery/",
+  "keywords": [
+    "ast",
+    "ecmascript",
+    "javascript",
+    "query"
+  ],
+  "devDependencies": {
+    "@babel/core": "^7.9.0",
+    "@babel/preset-env": "^7.9.5",
+    "@babel/register": "^7.9.0",
+    "@rollup/plugin-commonjs": "^11.1.0",
+    "@rollup/plugin-json": "^4.0.2",
+    "@rollup/plugin-node-resolve": "^7.1.3",
+    "babel-plugin-transform-es2017-object-entries": "0.0.5",
+    "chai": "4.2.0",
+    "eslint": "^6.8.0",
+    "esprima": "~4.0.1",
+    "mocha": "7.1.1",
+    "nyc": "^15.0.1",
+    "pegjs": "~0.10.0",
+    "rollup": "^1.32.1",
+    "rollup-plugin-babel": "^4.4.0",
+    "rollup-plugin-terser": "^5.3.0"
+  },
+  "license": "BSD-3-Clause",
+  "engines": {
+    "node": ">=0.10"
+  },
+  "dependencies": {
+    "estraverse": "^5.1.0"
+  }
+}
Index: frontend/node_modules/esquery/parser.js
===================================================================
--- frontend/node_modules/esquery/parser.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/esquery/parser.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,2941 @@
+/*
+ * Generated by PEG.js 0.10.0.
+ *
+ * http://pegjs.org/
+ */
+(function(root, factory) {
+  if (typeof define === "function" && define.amd) {
+    define([], factory);
+  } else if (typeof module === "object" && module.exports) {
+    module.exports = factory();
+  }
+})(this, function() {
+  "use strict";
+
+  function peg$subclass(child, parent) {
+    function ctor() { this.constructor = child; }
+    ctor.prototype = parent.prototype;
+    child.prototype = new ctor();
+  }
+
+  function peg$SyntaxError(message, expected, found, location) {
+    this.message  = message;
+    this.expected = expected;
+    this.found    = found;
+    this.location = location;
+    this.name     = "SyntaxError";
+
+    if (typeof Error.captureStackTrace === "function") {
+      Error.captureStackTrace(this, peg$SyntaxError);
+    }
+  }
+
+  peg$subclass(peg$SyntaxError, Error);
+
+  peg$SyntaxError.buildMessage = function(expected, found) {
+    var DESCRIBE_EXPECTATION_FNS = {
+          literal: function(expectation) {
+            return "\"" + literalEscape(expectation.text) + "\"";
+          },
+
+          "class": function(expectation) {
+            var escapedParts = "",
+                i;
+
+            for (i = 0; i < expectation.parts.length; i++) {
+              escapedParts += expectation.parts[i] instanceof Array
+                ? classEscape(expectation.parts[i][0]) + "-" + classEscape(expectation.parts[i][1])
+                : classEscape(expectation.parts[i]);
+            }
+
+            return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
+          },
+
+          any: function(expectation) {
+            return "any character";
+          },
+
+          end: function(expectation) {
+            return "end of input";
+          },
+
+          other: function(expectation) {
+            return expectation.description;
+          }
+        };
+
+    function hex(ch) {
+      return ch.charCodeAt(0).toString(16).toUpperCase();
+    }
+
+    function literalEscape(s) {
+      return s
+        .replace(/\\/g, '\\\\')
+        .replace(/"/g,  '\\"')
+        .replace(/\0/g, '\\0')
+        .replace(/\t/g, '\\t')
+        .replace(/\n/g, '\\n')
+        .replace(/\r/g, '\\r')
+        .replace(/[\x00-\x0F]/g,          function(ch) { return '\\x0' + hex(ch); })
+        .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return '\\x'  + hex(ch); });
+    }
+
+    function classEscape(s) {
+      return s
+        .replace(/\\/g, '\\\\')
+        .replace(/\]/g, '\\]')
+        .replace(/\^/g, '\\^')
+        .replace(/-/g,  '\\-')
+        .replace(/\0/g, '\\0')
+        .replace(/\t/g, '\\t')
+        .replace(/\n/g, '\\n')
+        .replace(/\r/g, '\\r')
+        .replace(/[\x00-\x0F]/g,          function(ch) { return '\\x0' + hex(ch); })
+        .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return '\\x'  + hex(ch); });
+    }
+
+    function describeExpectation(expectation) {
+      return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
+    }
+
+    function describeExpected(expected) {
+      var descriptions = new Array(expected.length),
+          i, j;
+
+      for (i = 0; i < expected.length; i++) {
+        descriptions[i] = describeExpectation(expected[i]);
+      }
+
+      descriptions.sort();
+
+      if (descriptions.length > 0) {
+        for (i = 1, j = 1; i < descriptions.length; i++) {
+          if (descriptions[i - 1] !== descriptions[i]) {
+            descriptions[j] = descriptions[i];
+            j++;
+          }
+        }
+        descriptions.length = j;
+      }
+
+      switch (descriptions.length) {
+        case 1:
+          return descriptions[0];
+
+        case 2:
+          return descriptions[0] + " or " + descriptions[1];
+
+        default:
+          return descriptions.slice(0, -1).join(", ")
+            + ", or "
+            + descriptions[descriptions.length - 1];
+      }
+    }
+
+    function describeFound(found) {
+      return found ? "\"" + literalEscape(found) + "\"" : "end of input";
+    }
+
+    return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
+  };
+
+  function peg$parse(input, options) {
+    options = options !== void 0 ? options : {};
+
+    var peg$FAILED = {},
+
+        peg$startRuleFunctions = { start: peg$parsestart },
+        peg$startRuleFunction  = peg$parsestart,
+
+        peg$c0 = function(ss) {
+            return ss.length === 1 ? ss[0] : { type: 'matches', selectors: ss };
+          },
+        peg$c1 = function() { return void 0; },
+        peg$c2 = " ",
+        peg$c3 = peg$literalExpectation(" ", false),
+        peg$c4 = /^[^ [\],():#!=><~+.]/,
+        peg$c5 = peg$classExpectation([" ", "[", "]", ",", "(", ")", ":", "#", "!", "=", ">", "<", "~", "+", "."], true, false),
+        peg$c6 = function(i) { return i.join(''); },
+        peg$c7 = ">",
+        peg$c8 = peg$literalExpectation(">", false),
+        peg$c9 = function() { return 'child'; },
+        peg$c10 = "~",
+        peg$c11 = peg$literalExpectation("~", false),
+        peg$c12 = function() { return 'sibling'; },
+        peg$c13 = "+",
+        peg$c14 = peg$literalExpectation("+", false),
+        peg$c15 = function() { return 'adjacent'; },
+        peg$c16 = function() { return 'descendant'; },
+        peg$c17 = ",",
+        peg$c18 = peg$literalExpectation(",", false),
+        peg$c19 = function(s, ss) {
+          return [s].concat(ss.map(function (s) { return s[3]; }));
+        },
+        peg$c20 = function(op, s) {
+            if (!op) return s;
+            return { type: op, left: { type: 'exactNode' }, right: s };
+          },
+        peg$c21 = function(a, ops) {
+            return ops.reduce(function (memo, rhs) {
+              return { type: rhs[0], left: memo, right: rhs[1] };
+            }, a);
+          },
+        peg$c22 = "!",
+        peg$c23 = peg$literalExpectation("!", false),
+        peg$c24 = function(subject, as) {
+            const b = as.length === 1 ? as[0] : { type: 'compound', selectors: as };
+            if(subject) b.subject = true;
+            return b;
+          },
+        peg$c25 = "*",
+        peg$c26 = peg$literalExpectation("*", false),
+        peg$c27 = function(a) { return { type: 'wildcard', value: a }; },
+        peg$c28 = "#",
+        peg$c29 = peg$literalExpectation("#", false),
+        peg$c30 = function(i) { return { type: 'identifier', value: i }; },
+        peg$c31 = "[",
+        peg$c32 = peg$literalExpectation("[", false),
+        peg$c33 = "]",
+        peg$c34 = peg$literalExpectation("]", false),
+        peg$c35 = function(v) { return v; },
+        peg$c36 = /^[><!]/,
+        peg$c37 = peg$classExpectation([">", "<", "!"], false, false),
+        peg$c38 = "=",
+        peg$c39 = peg$literalExpectation("=", false),
+        peg$c40 = function(a) { return (a || '') + '='; },
+        peg$c41 = /^[><]/,
+        peg$c42 = peg$classExpectation([">", "<"], false, false),
+        peg$c43 = ".",
+        peg$c44 = peg$literalExpectation(".", false),
+        peg$c45 = function(a, as) {
+            return [].concat.apply([a], as).join('');
+          },
+        peg$c46 = function(name, op, value) {
+              return { type: 'attribute', name: name, operator: op, value: value };
+            },
+        peg$c47 = function(name) { return { type: 'attribute', name: name }; },
+        peg$c48 = "\"",
+        peg$c49 = peg$literalExpectation("\"", false),
+        peg$c50 = /^[^\\"]/,
+        peg$c51 = peg$classExpectation(["\\", "\""], true, false),
+        peg$c52 = "\\",
+        peg$c53 = peg$literalExpectation("\\", false),
+        peg$c54 = peg$anyExpectation(),
+        peg$c55 = function(a, b) { return a + b; },
+        peg$c56 = function(d) {
+                return { type: 'literal', value: strUnescape(d.join('')) };
+              },
+        peg$c57 = "'",
+        peg$c58 = peg$literalExpectation("'", false),
+        peg$c59 = /^[^\\']/,
+        peg$c60 = peg$classExpectation(["\\", "'"], true, false),
+        peg$c61 = /^[0-9]/,
+        peg$c62 = peg$classExpectation([["0", "9"]], false, false),
+        peg$c63 = function(a, b) {
+                // Can use `a.flat().join('')` once supported
+                const leadingDecimals = a ? [].concat.apply([], a).join('') : '';
+                return { type: 'literal', value: parseFloat(leadingDecimals + b.join('')) };
+              },
+        peg$c64 = function(i) { return { type: 'literal', value: i }; },
+        peg$c65 = "type(",
+        peg$c66 = peg$literalExpectation("type(", false),
+        peg$c67 = /^[^ )]/,
+        peg$c68 = peg$classExpectation([" ", ")"], true, false),
+        peg$c69 = ")",
+        peg$c70 = peg$literalExpectation(")", false),
+        peg$c71 = function(t) { return { type: 'type', value: t.join('') }; },
+        peg$c72 = /^[imsu]/,
+        peg$c73 = peg$classExpectation(["i", "m", "s", "u"], false, false),
+        peg$c74 = "/",
+        peg$c75 = peg$literalExpectation("/", false),
+        peg$c76 = function(pattern, flgs) {
+              return {
+                type: 'regexp', value: new RegExp(pattern.join(''), flgs ? flgs.join('') : '')
+              };
+            },
+        peg$c77 = /^[^\]\\]/,
+        peg$c78 = peg$classExpectation(["]", "\\"], true, false),
+        peg$c79 = function(cs) { return '[' + cs.join('') + ']'; },
+        peg$c80 = function(a) { return '\\' + a; },
+        peg$c81 = /^[^\/\\[]/,
+        peg$c82 = peg$classExpectation(["/", "\\", "["], true, false),
+        peg$c83 = function(cs) { return cs.join(''); },
+        peg$c84 = function(i, is) {
+          return { type: 'field', name: is.reduce(function(memo, p){ return memo + p[0] + p[1]; }, i)};
+        },
+        peg$c85 = ":not(",
+        peg$c86 = peg$literalExpectation(":not(", false),
+        peg$c87 = function(ss) { return { type: 'not', selectors: ss }; },
+        peg$c88 = ":matches(",
+        peg$c89 = peg$literalExpectation(":matches(", false),
+        peg$c90 = function(ss) { return { type: 'matches', selectors: ss }; },
+        peg$c91 = ":is(",
+        peg$c92 = peg$literalExpectation(":is(", false),
+        peg$c93 = ":has(",
+        peg$c94 = peg$literalExpectation(":has(", false),
+        peg$c95 = function(ss) { return { type: 'has', selectors: ss }; },
+        peg$c96 = ":first-child",
+        peg$c97 = peg$literalExpectation(":first-child", false),
+        peg$c98 = function() { return nth(1); },
+        peg$c99 = ":last-child",
+        peg$c100 = peg$literalExpectation(":last-child", false),
+        peg$c101 = function() { return nthLast(1); },
+        peg$c102 = ":nth-child(",
+        peg$c103 = peg$literalExpectation(":nth-child(", false),
+        peg$c104 = function(n) { return nth(parseInt(n.join(''), 10)); },
+        peg$c105 = ":nth-last-child(",
+        peg$c106 = peg$literalExpectation(":nth-last-child(", false),
+        peg$c107 = function(n) { return nthLast(parseInt(n.join(''), 10)); },
+        peg$c108 = ":",
+        peg$c109 = peg$literalExpectation(":", false),
+        peg$c110 = function(c) {
+          return { type: 'class', name: c };
+        },
+
+        peg$currPos          = 0,
+        peg$savedPos         = 0,
+        peg$posDetailsCache  = [{ line: 1, column: 1 }],
+        peg$maxFailPos       = 0,
+        peg$maxFailExpected  = [],
+        peg$silentFails      = 0,
+
+        peg$resultsCache = {},
+
+        peg$result;
+
+    if ("startRule" in options) {
+      if (!(options.startRule in peg$startRuleFunctions)) {
+        throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
+      }
+
+      peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
+    }
+
+    function text() {
+      return input.substring(peg$savedPos, peg$currPos);
+    }
+
+    function location() {
+      return peg$computeLocation(peg$savedPos, peg$currPos);
+    }
+
+    function expected(description, location) {
+      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)
+
+      throw peg$buildStructuredError(
+        [peg$otherExpectation(description)],
+        input.substring(peg$savedPos, peg$currPos),
+        location
+      );
+    }
+
+    function error(message, location) {
+      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)
+
+      throw peg$buildSimpleError(message, location);
+    }
+
+    function peg$literalExpectation(text, ignoreCase) {
+      return { type: "literal", text: text, ignoreCase: ignoreCase };
+    }
+
+    function peg$classExpectation(parts, inverted, ignoreCase) {
+      return { type: "class", parts: parts, inverted: inverted, ignoreCase: ignoreCase };
+    }
+
+    function peg$anyExpectation() {
+      return { type: "any" };
+    }
+
+    function peg$endExpectation() {
+      return { type: "end" };
+    }
+
+    function peg$otherExpectation(description) {
+      return { type: "other", description: description };
+    }
+
+    function peg$computePosDetails(pos) {
+      var details = peg$posDetailsCache[pos], p;
+
+      if (details) {
+        return details;
+      } else {
+        p = pos - 1;
+        while (!peg$posDetailsCache[p]) {
+          p--;
+        }
+
+        details = peg$posDetailsCache[p];
+        details = {
+          line:   details.line,
+          column: details.column
+        };
+
+        while (p < pos) {
+          if (input.charCodeAt(p) === 10) {
+            details.line++;
+            details.column = 1;
+          } else {
+            details.column++;
+          }
+
+          p++;
+        }
+
+        peg$posDetailsCache[pos] = details;
+        return details;
+      }
+    }
+
+    function peg$computeLocation(startPos, endPos) {
+      var startPosDetails = peg$computePosDetails(startPos),
+          endPosDetails   = peg$computePosDetails(endPos);
+
+      return {
+        start: {
+          offset: startPos,
+          line:   startPosDetails.line,
+          column: startPosDetails.column
+        },
+        end: {
+          offset: endPos,
+          line:   endPosDetails.line,
+          column: endPosDetails.column
+        }
+      };
+    }
+
+    function peg$fail(expected) {
+      if (peg$currPos < peg$maxFailPos) { return; }
+
+      if (peg$currPos > peg$maxFailPos) {
+        peg$maxFailPos = peg$currPos;
+        peg$maxFailExpected = [];
+      }
+
+      peg$maxFailExpected.push(expected);
+    }
+
+    function peg$buildSimpleError(message, location) {
+      return new peg$SyntaxError(message, null, null, location);
+    }
+
+    function peg$buildStructuredError(expected, found, location) {
+      return new peg$SyntaxError(
+        peg$SyntaxError.buildMessage(expected, found),
+        expected,
+        found,
+        location
+      );
+    }
+
+    function peg$parsestart() {
+      var s0, s1, s2, s3;
+
+      var key    = peg$currPos * 36 + 0,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      s1 = peg$parse_();
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parseselectors();
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parse_();
+          if (s3 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s1 = peg$c0(s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        s0 = peg$currPos;
+        s1 = peg$parse_();
+        if (s1 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c1();
+        }
+        s0 = s1;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parse_() {
+      var s0, s1;
+
+      var key    = peg$currPos * 36 + 1,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = [];
+      if (input.charCodeAt(peg$currPos) === 32) {
+        s1 = peg$c2;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c3); }
+      }
+      while (s1 !== peg$FAILED) {
+        s0.push(s1);
+        if (input.charCodeAt(peg$currPos) === 32) {
+          s1 = peg$c2;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c3); }
+        }
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseidentifierName() {
+      var s0, s1, s2;
+
+      var key    = peg$currPos * 36 + 2,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      s1 = [];
+      if (peg$c4.test(input.charAt(peg$currPos))) {
+        s2 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c5); }
+      }
+      if (s2 !== peg$FAILED) {
+        while (s2 !== peg$FAILED) {
+          s1.push(s2);
+          if (peg$c4.test(input.charAt(peg$currPos))) {
+            s2 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c5); }
+          }
+        }
+      } else {
+        s1 = peg$FAILED;
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c6(s1);
+      }
+      s0 = s1;
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsebinaryOp() {
+      var s0, s1, s2, s3;
+
+      var key    = peg$currPos * 36 + 3,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      s1 = peg$parse_();
+      if (s1 !== peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 62) {
+          s2 = peg$c7;
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c8); }
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parse_();
+          if (s3 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s1 = peg$c9();
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        s0 = peg$currPos;
+        s1 = peg$parse_();
+        if (s1 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 126) {
+            s2 = peg$c10;
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c11); }
+          }
+          if (s2 !== peg$FAILED) {
+            s3 = peg$parse_();
+            if (s3 !== peg$FAILED) {
+              peg$savedPos = s0;
+              s1 = peg$c12();
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        if (s0 === peg$FAILED) {
+          s0 = peg$currPos;
+          s1 = peg$parse_();
+          if (s1 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 43) {
+              s2 = peg$c13;
+              peg$currPos++;
+            } else {
+              s2 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c14); }
+            }
+            if (s2 !== peg$FAILED) {
+              s3 = peg$parse_();
+              if (s3 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c15();
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 32) {
+              s1 = peg$c2;
+              peg$currPos++;
+            } else {
+              s1 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c3); }
+            }
+            if (s1 !== peg$FAILED) {
+              s2 = peg$parse_();
+              if (s2 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c16();
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          }
+        }
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsehasSelectors() {
+      var s0, s1, s2, s3, s4, s5, s6, s7;
+
+      var key    = peg$currPos * 36 + 4,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      s1 = peg$parsehasSelector();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$currPos;
+        s4 = peg$parse_();
+        if (s4 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 44) {
+            s5 = peg$c17;
+            peg$currPos++;
+          } else {
+            s5 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c18); }
+          }
+          if (s5 !== peg$FAILED) {
+            s6 = peg$parse_();
+            if (s6 !== peg$FAILED) {
+              s7 = peg$parsehasSelector();
+              if (s7 !== peg$FAILED) {
+                s4 = [s4, s5, s6, s7];
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$currPos;
+          s4 = peg$parse_();
+          if (s4 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 44) {
+              s5 = peg$c17;
+              peg$currPos++;
+            } else {
+              s5 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c18); }
+            }
+            if (s5 !== peg$FAILED) {
+              s6 = peg$parse_();
+              if (s6 !== peg$FAILED) {
+                s7 = peg$parsehasSelector();
+                if (s7 !== peg$FAILED) {
+                  s4 = [s4, s5, s6, s7];
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c19(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseselectors() {
+      var s0, s1, s2, s3, s4, s5, s6, s7;
+
+      var key    = peg$currPos * 36 + 5,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      s1 = peg$parseselector();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$currPos;
+        s4 = peg$parse_();
+        if (s4 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 44) {
+            s5 = peg$c17;
+            peg$currPos++;
+          } else {
+            s5 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c18); }
+          }
+          if (s5 !== peg$FAILED) {
+            s6 = peg$parse_();
+            if (s6 !== peg$FAILED) {
+              s7 = peg$parseselector();
+              if (s7 !== peg$FAILED) {
+                s4 = [s4, s5, s6, s7];
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$currPos;
+          s4 = peg$parse_();
+          if (s4 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 44) {
+              s5 = peg$c17;
+              peg$currPos++;
+            } else {
+              s5 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c18); }
+            }
+            if (s5 !== peg$FAILED) {
+              s6 = peg$parse_();
+              if (s6 !== peg$FAILED) {
+                s7 = peg$parseselector();
+                if (s7 !== peg$FAILED) {
+                  s4 = [s4, s5, s6, s7];
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c19(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsehasSelector() {
+      var s0, s1, s2;
+
+      var key    = peg$currPos * 36 + 6,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      s1 = peg$parsebinaryOp();
+      if (s1 === peg$FAILED) {
+        s1 = null;
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parseselector();
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c20(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseselector() {
+      var s0, s1, s2, s3, s4, s5;
+
+      var key    = peg$currPos * 36 + 7,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      s1 = peg$parsesequence();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$currPos;
+        s4 = peg$parsebinaryOp();
+        if (s4 !== peg$FAILED) {
+          s5 = peg$parsesequence();
+          if (s5 !== peg$FAILED) {
+            s4 = [s4, s5];
+            s3 = s4;
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$currPos;
+          s4 = peg$parsebinaryOp();
+          if (s4 !== peg$FAILED) {
+            s5 = peg$parsesequence();
+            if (s5 !== peg$FAILED) {
+              s4 = [s4, s5];
+              s3 = s4;
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c21(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsesequence() {
+      var s0, s1, s2, s3;
+
+      var key    = peg$currPos * 36 + 8,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 33) {
+        s1 = peg$c22;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c23); }
+      }
+      if (s1 === peg$FAILED) {
+        s1 = null;
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parseatom();
+        if (s3 !== peg$FAILED) {
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            s3 = peg$parseatom();
+          }
+        } else {
+          s2 = peg$FAILED;
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c24(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseatom() {
+      var s0;
+
+      var key    = peg$currPos * 36 + 9,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$parsewildcard();
+      if (s0 === peg$FAILED) {
+        s0 = peg$parseidentifier();
+        if (s0 === peg$FAILED) {
+          s0 = peg$parseattr();
+          if (s0 === peg$FAILED) {
+            s0 = peg$parsefield();
+            if (s0 === peg$FAILED) {
+              s0 = peg$parsenegation();
+              if (s0 === peg$FAILED) {
+                s0 = peg$parsematches();
+                if (s0 === peg$FAILED) {
+                  s0 = peg$parseis();
+                  if (s0 === peg$FAILED) {
+                    s0 = peg$parsehas();
+                    if (s0 === peg$FAILED) {
+                      s0 = peg$parsefirstChild();
+                      if (s0 === peg$FAILED) {
+                        s0 = peg$parselastChild();
+                        if (s0 === peg$FAILED) {
+                          s0 = peg$parsenthChild();
+                          if (s0 === peg$FAILED) {
+                            s0 = peg$parsenthLastChild();
+                            if (s0 === peg$FAILED) {
+                              s0 = peg$parseclass();
+                            }
+                          }
+                        }
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsewildcard() {
+      var s0, s1;
+
+      var key    = peg$currPos * 36 + 10,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 42) {
+        s1 = peg$c25;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c26); }
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c27(s1);
+      }
+      s0 = s1;
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseidentifier() {
+      var s0, s1, s2;
+
+      var key    = peg$currPos * 36 + 11,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 35) {
+        s1 = peg$c28;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c29); }
+      }
+      if (s1 === peg$FAILED) {
+        s1 = null;
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parseidentifierName();
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c30(s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseattr() {
+      var s0, s1, s2, s3, s4, s5;
+
+      var key    = peg$currPos * 36 + 12,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 91) {
+        s1 = peg$c31;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c32); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseattrValue();
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 93) {
+                s5 = peg$c33;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c34); }
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c35(s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseattrOps() {
+      var s0, s1, s2;
+
+      var key    = peg$currPos * 36 + 13,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (peg$c36.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c37); }
+      }
+      if (s1 === peg$FAILED) {
+        s1 = null;
+      }
+      if (s1 !== peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 61) {
+          s2 = peg$c38;
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c39); }
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c40(s1);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        if (peg$c41.test(input.charAt(peg$currPos))) {
+          s0 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s0 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c42); }
+        }
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseattrEqOps() {
+      var s0, s1, s2;
+
+      var key    = peg$currPos * 36 + 14,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 33) {
+        s1 = peg$c22;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c23); }
+      }
+      if (s1 === peg$FAILED) {
+        s1 = null;
+      }
+      if (s1 !== peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 61) {
+          s2 = peg$c38;
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c39); }
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c40(s1);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseattrName() {
+      var s0, s1, s2, s3, s4, s5;
+
+      var key    = peg$currPos * 36 + 15,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      s1 = peg$parseidentifierName();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 46) {
+          s4 = peg$c43;
+          peg$currPos++;
+        } else {
+          s4 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c44); }
+        }
+        if (s4 !== peg$FAILED) {
+          s5 = peg$parseidentifierName();
+          if (s5 !== peg$FAILED) {
+            s4 = [s4, s5];
+            s3 = s4;
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 46) {
+            s4 = peg$c43;
+            peg$currPos++;
+          } else {
+            s4 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c44); }
+          }
+          if (s4 !== peg$FAILED) {
+            s5 = peg$parseidentifierName();
+            if (s5 !== peg$FAILED) {
+              s4 = [s4, s5];
+              s3 = s4;
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c45(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseattrValue() {
+      var s0, s1, s2, s3, s4, s5;
+
+      var key    = peg$currPos * 36 + 16,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      s1 = peg$parseattrName();
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseattrEqOps();
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parsetype();
+              if (s5 === peg$FAILED) {
+                s5 = peg$parseregex();
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c46(s1, s3, s5);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        s0 = peg$currPos;
+        s1 = peg$parseattrName();
+        if (s1 !== peg$FAILED) {
+          s2 = peg$parse_();
+          if (s2 !== peg$FAILED) {
+            s3 = peg$parseattrOps();
+            if (s3 !== peg$FAILED) {
+              s4 = peg$parse_();
+              if (s4 !== peg$FAILED) {
+                s5 = peg$parsestring();
+                if (s5 === peg$FAILED) {
+                  s5 = peg$parsenumber();
+                  if (s5 === peg$FAILED) {
+                    s5 = peg$parsepath();
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  peg$savedPos = s0;
+                  s1 = peg$c46(s1, s3, s5);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        if (s0 === peg$FAILED) {
+          s0 = peg$currPos;
+          s1 = peg$parseattrName();
+          if (s1 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s1 = peg$c47(s1);
+          }
+          s0 = s1;
+        }
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsestring() {
+      var s0, s1, s2, s3, s4, s5;
+
+      var key    = peg$currPos * 36 + 17,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 34) {
+        s1 = peg$c48;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c49); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        if (peg$c50.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c51); }
+        }
+        if (s3 === peg$FAILED) {
+          s3 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 92) {
+            s4 = peg$c52;
+            peg$currPos++;
+          } else {
+            s4 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c53); }
+          }
+          if (s4 !== peg$FAILED) {
+            if (input.length > peg$currPos) {
+              s5 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s5 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c54); }
+            }
+            if (s5 !== peg$FAILED) {
+              peg$savedPos = s3;
+              s4 = peg$c55(s4, s5);
+              s3 = s4;
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          if (peg$c50.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c51); }
+          }
+          if (s3 === peg$FAILED) {
+            s3 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 92) {
+              s4 = peg$c52;
+              peg$currPos++;
+            } else {
+              s4 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c53); }
+            }
+            if (s4 !== peg$FAILED) {
+              if (input.length > peg$currPos) {
+                s5 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c54); }
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s3;
+                s4 = peg$c55(s4, s5);
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 34) {
+            s3 = peg$c48;
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c49); }
+          }
+          if (s3 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s1 = peg$c56(s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 39) {
+          s1 = peg$c57;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c58); }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = [];
+          if (peg$c59.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c60); }
+          }
+          if (s3 === peg$FAILED) {
+            s3 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 92) {
+              s4 = peg$c52;
+              peg$currPos++;
+            } else {
+              s4 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c53); }
+            }
+            if (s4 !== peg$FAILED) {
+              if (input.length > peg$currPos) {
+                s5 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c54); }
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s3;
+                s4 = peg$c55(s4, s5);
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          }
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            if (peg$c59.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c60); }
+            }
+            if (s3 === peg$FAILED) {
+              s3 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 92) {
+                s4 = peg$c52;
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c53); }
+              }
+              if (s4 !== peg$FAILED) {
+                if (input.length > peg$currPos) {
+                  s5 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s5 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c54); }
+                }
+                if (s5 !== peg$FAILED) {
+                  peg$savedPos = s3;
+                  s4 = peg$c55(s4, s5);
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 39) {
+              s3 = peg$c57;
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c58); }
+            }
+            if (s3 !== peg$FAILED) {
+              peg$savedPos = s0;
+              s1 = peg$c56(s2);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsenumber() {
+      var s0, s1, s2, s3;
+
+      var key    = peg$currPos * 36 + 18,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      s1 = peg$currPos;
+      s2 = [];
+      if (peg$c61.test(input.charAt(peg$currPos))) {
+        s3 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c62); }
+      }
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        if (peg$c61.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c62); }
+        }
+      }
+      if (s2 !== peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 46) {
+          s3 = peg$c43;
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c44); }
+        }
+        if (s3 !== peg$FAILED) {
+          s2 = [s2, s3];
+          s1 = s2;
+        } else {
+          peg$currPos = s1;
+          s1 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s1;
+        s1 = peg$FAILED;
+      }
+      if (s1 === peg$FAILED) {
+        s1 = null;
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        if (peg$c61.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c62); }
+        }
+        if (s3 !== peg$FAILED) {
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            if (peg$c61.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c62); }
+            }
+          }
+        } else {
+          s2 = peg$FAILED;
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c63(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsepath() {
+      var s0, s1;
+
+      var key    = peg$currPos * 36 + 19,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      s1 = peg$parseidentifierName();
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c64(s1);
+      }
+      s0 = s1;
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsetype() {
+      var s0, s1, s2, s3, s4, s5;
+
+      var key    = peg$currPos * 36 + 20,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 5) === peg$c65) {
+        s1 = peg$c65;
+        peg$currPos += 5;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c66); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 !== peg$FAILED) {
+          s3 = [];
+          if (peg$c67.test(input.charAt(peg$currPos))) {
+            s4 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s4 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c68); }
+          }
+          if (s4 !== peg$FAILED) {
+            while (s4 !== peg$FAILED) {
+              s3.push(s4);
+              if (peg$c67.test(input.charAt(peg$currPos))) {
+                s4 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c68); }
+              }
+            }
+          } else {
+            s3 = peg$FAILED;
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 41) {
+                s5 = peg$c69;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c70); }
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c71(s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseflags() {
+      var s0, s1;
+
+      var key    = peg$currPos * 36 + 21,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = [];
+      if (peg$c72.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c73); }
+      }
+      if (s1 !== peg$FAILED) {
+        while (s1 !== peg$FAILED) {
+          s0.push(s1);
+          if (peg$c72.test(input.charAt(peg$currPos))) {
+            s1 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c73); }
+          }
+        }
+      } else {
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseregex() {
+      var s0, s1, s2, s3, s4;
+
+      var key    = peg$currPos * 36 + 22,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 47) {
+        s1 = peg$c74;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c75); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parsere_character_class();
+        if (s3 === peg$FAILED) {
+          s3 = peg$parsere_escape();
+          if (s3 === peg$FAILED) {
+            s3 = peg$parsere_chars();
+          }
+        }
+        if (s3 !== peg$FAILED) {
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            s3 = peg$parsere_character_class();
+            if (s3 === peg$FAILED) {
+              s3 = peg$parsere_escape();
+              if (s3 === peg$FAILED) {
+                s3 = peg$parsere_chars();
+              }
+            }
+          }
+        } else {
+          s2 = peg$FAILED;
+        }
+        if (s2 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 47) {
+            s3 = peg$c74;
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c75); }
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parseflags();
+            if (s4 === peg$FAILED) {
+              s4 = null;
+            }
+            if (s4 !== peg$FAILED) {
+              peg$savedPos = s0;
+              s1 = peg$c76(s2, s4);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsere_character_class() {
+      var s0, s1, s2, s3;
+
+      var key    = peg$currPos * 36 + 23,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 91) {
+        s1 = peg$c31;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c32); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        if (peg$c77.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c78); }
+        }
+        if (s3 === peg$FAILED) {
+          s3 = peg$parsere_escape();
+        }
+        if (s3 !== peg$FAILED) {
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            if (peg$c77.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c78); }
+            }
+            if (s3 === peg$FAILED) {
+              s3 = peg$parsere_escape();
+            }
+          }
+        } else {
+          s2 = peg$FAILED;
+        }
+        if (s2 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 93) {
+            s3 = peg$c33;
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c34); }
+          }
+          if (s3 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s1 = peg$c79(s2);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsere_escape() {
+      var s0, s1, s2;
+
+      var key    = peg$currPos * 36 + 24,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 92) {
+        s1 = peg$c52;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c53); }
+      }
+      if (s1 !== peg$FAILED) {
+        if (input.length > peg$currPos) {
+          s2 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c54); }
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c80(s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsere_chars() {
+      var s0, s1, s2;
+
+      var key    = peg$currPos * 36 + 25,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      s1 = [];
+      if (peg$c81.test(input.charAt(peg$currPos))) {
+        s2 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c82); }
+      }
+      if (s2 !== peg$FAILED) {
+        while (s2 !== peg$FAILED) {
+          s1.push(s2);
+          if (peg$c81.test(input.charAt(peg$currPos))) {
+            s2 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c82); }
+          }
+        }
+      } else {
+        s1 = peg$FAILED;
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c83(s1);
+      }
+      s0 = s1;
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsefield() {
+      var s0, s1, s2, s3, s4, s5, s6;
+
+      var key    = peg$currPos * 36 + 26,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 46) {
+        s1 = peg$c43;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c44); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parseidentifierName();
+        if (s2 !== peg$FAILED) {
+          s3 = [];
+          s4 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 46) {
+            s5 = peg$c43;
+            peg$currPos++;
+          } else {
+            s5 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c44); }
+          }
+          if (s5 !== peg$FAILED) {
+            s6 = peg$parseidentifierName();
+            if (s6 !== peg$FAILED) {
+              s5 = [s5, s6];
+              s4 = s5;
+            } else {
+              peg$currPos = s4;
+              s4 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s4;
+            s4 = peg$FAILED;
+          }
+          while (s4 !== peg$FAILED) {
+            s3.push(s4);
+            s4 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 46) {
+              s5 = peg$c43;
+              peg$currPos++;
+            } else {
+              s5 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c44); }
+            }
+            if (s5 !== peg$FAILED) {
+              s6 = peg$parseidentifierName();
+              if (s6 !== peg$FAILED) {
+                s5 = [s5, s6];
+                s4 = s5;
+              } else {
+                peg$currPos = s4;
+                s4 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s4;
+              s4 = peg$FAILED;
+            }
+          }
+          if (s3 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s1 = peg$c84(s2, s3);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsenegation() {
+      var s0, s1, s2, s3, s4, s5;
+
+      var key    = peg$currPos * 36 + 27,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 5) === peg$c85) {
+        s1 = peg$c85;
+        peg$currPos += 5;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c86); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseselectors();
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 41) {
+                s5 = peg$c69;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c70); }
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c87(s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsematches() {
+      var s0, s1, s2, s3, s4, s5;
+
+      var key    = peg$currPos * 36 + 28,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 9) === peg$c88) {
+        s1 = peg$c88;
+        peg$currPos += 9;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c89); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseselectors();
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 41) {
+                s5 = peg$c69;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c70); }
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c90(s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseis() {
+      var s0, s1, s2, s3, s4, s5;
+
+      var key    = peg$currPos * 36 + 29,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 4) === peg$c91) {
+        s1 = peg$c91;
+        peg$currPos += 4;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c92); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseselectors();
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 41) {
+                s5 = peg$c69;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c70); }
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c90(s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsehas() {
+      var s0, s1, s2, s3, s4, s5;
+
+      var key    = peg$currPos * 36 + 30,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 5) === peg$c93) {
+        s1 = peg$c93;
+        peg$currPos += 5;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c94); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parsehasSelectors();
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 41) {
+                s5 = peg$c69;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c70); }
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c95(s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsefirstChild() {
+      var s0, s1;
+
+      var key    = peg$currPos * 36 + 31,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 12) === peg$c96) {
+        s1 = peg$c96;
+        peg$currPos += 12;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c97); }
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c98();
+      }
+      s0 = s1;
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parselastChild() {
+      var s0, s1;
+
+      var key    = peg$currPos * 36 + 32,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 11) === peg$c99) {
+        s1 = peg$c99;
+        peg$currPos += 11;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c100); }
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c101();
+      }
+      s0 = s1;
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsenthChild() {
+      var s0, s1, s2, s3, s4, s5;
+
+      var key    = peg$currPos * 36 + 33,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 11) === peg$c102) {
+        s1 = peg$c102;
+        peg$currPos += 11;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c103); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 !== peg$FAILED) {
+          s3 = [];
+          if (peg$c61.test(input.charAt(peg$currPos))) {
+            s4 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s4 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c62); }
+          }
+          if (s4 !== peg$FAILED) {
+            while (s4 !== peg$FAILED) {
+              s3.push(s4);
+              if (peg$c61.test(input.charAt(peg$currPos))) {
+                s4 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c62); }
+              }
+            }
+          } else {
+            s3 = peg$FAILED;
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 41) {
+                s5 = peg$c69;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c70); }
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c104(s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parsenthLastChild() {
+      var s0, s1, s2, s3, s4, s5;
+
+      var key    = peg$currPos * 36 + 34,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 16) === peg$c105) {
+        s1 = peg$c105;
+        peg$currPos += 16;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c106); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 !== peg$FAILED) {
+          s3 = [];
+          if (peg$c61.test(input.charAt(peg$currPos))) {
+            s4 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s4 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c62); }
+          }
+          if (s4 !== peg$FAILED) {
+            while (s4 !== peg$FAILED) {
+              s3.push(s4);
+              if (peg$c61.test(input.charAt(peg$currPos))) {
+                s4 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c62); }
+              }
+            }
+          } else {
+            s3 = peg$FAILED;
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 41) {
+                s5 = peg$c69;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c70); }
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c107(s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+    function peg$parseclass() {
+      var s0, s1, s2;
+
+      var key    = peg$currPos * 36 + 35,
+          cached = peg$resultsCache[key];
+
+      if (cached) {
+        peg$currPos = cached.nextPos;
+
+        return cached.result;
+      }
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 58) {
+        s1 = peg$c108;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c109); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parseidentifierName();
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c110(s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+      return s0;
+    }
+
+
+      function nth(n) { return { type: 'nth-child', index: { type: 'literal', value: n } }; }
+      function nthLast(n) { return { type: 'nth-last-child', index: { type: 'literal', value: n } }; }
+      function strUnescape(s) {
+        return s.replace(/\\(.)/g, function(match, ch) {
+          switch(ch) {
+            case 'b': return '\b';
+            case 'f': return '\f';
+            case 'n': return '\n';
+            case 'r': return '\r';
+            case 't': return '\t';
+            case 'v': return '\v';
+            default: return ch;
+          }
+        });
+      }
+
+
+    peg$result = peg$startRuleFunction();
+
+    if (peg$result !== peg$FAILED && peg$currPos === input.length) {
+      return peg$result;
+    } else {
+      if (peg$result !== peg$FAILED && peg$currPos < input.length) {
+        peg$fail(peg$endExpectation());
+      }
+
+      throw peg$buildStructuredError(
+        peg$maxFailExpected,
+        peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,
+        peg$maxFailPos < input.length
+          ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)
+          : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
+      );
+    }
+  }
+
+  return {
+    SyntaxError: peg$SyntaxError,
+    parse:       peg$parse
+  };
+});
