Index: node_modules/postcss-value-parser/lib/parse.js
===================================================================
--- node_modules/postcss-value-parser/lib/parse.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
+++ node_modules/postcss-value-parser/lib/parse.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
@@ -0,0 +1,321 @@
+var openParentheses = "(".charCodeAt(0);
+var closeParentheses = ")".charCodeAt(0);
+var singleQuote = "'".charCodeAt(0);
+var doubleQuote = '"'.charCodeAt(0);
+var backslash = "\\".charCodeAt(0);
+var slash = "/".charCodeAt(0);
+var comma = ",".charCodeAt(0);
+var colon = ":".charCodeAt(0);
+var star = "*".charCodeAt(0);
+var uLower = "u".charCodeAt(0);
+var uUpper = "U".charCodeAt(0);
+var plus = "+".charCodeAt(0);
+var isUnicodeRange = /^[a-f0-9?-]+$/i;
+
+module.exports = function(input) {
+  var tokens = [];
+  var value = input;
+
+  var next,
+    quote,
+    prev,
+    token,
+    escape,
+    escapePos,
+    whitespacePos,
+    parenthesesOpenPos;
+  var pos = 0;
+  var code = value.charCodeAt(pos);
+  var max = value.length;
+  var stack = [{ nodes: tokens }];
+  var balanced = 0;
+  var parent;
+
+  var name = "";
+  var before = "";
+  var after = "";
+
+  while (pos < max) {
+    // Whitespaces
+    if (code <= 32) {
+      next = pos;
+      do {
+        next += 1;
+        code = value.charCodeAt(next);
+      } while (code <= 32);
+      token = value.slice(pos, next);
+
+      prev = tokens[tokens.length - 1];
+      if (code === closeParentheses && balanced) {
+        after = token;
+      } else if (prev && prev.type === "div") {
+        prev.after = token;
+        prev.sourceEndIndex += token.length;
+      } else if (
+        code === comma ||
+        code === colon ||
+        (code === slash &&
+          value.charCodeAt(next + 1) !== star &&
+          (!parent ||
+            (parent && parent.type === "function" && parent.value !== "calc")))
+      ) {
+        before = token;
+      } else {
+        tokens.push({
+          type: "space",
+          sourceIndex: pos,
+          sourceEndIndex: next,
+          value: token
+        });
+      }
+
+      pos = next;
+
+      // Quotes
+    } else if (code === singleQuote || code === doubleQuote) {
+      next = pos;
+      quote = code === singleQuote ? "'" : '"';
+      token = {
+        type: "string",
+        sourceIndex: pos,
+        quote: quote
+      };
+      do {
+        escape = false;
+        next = value.indexOf(quote, next + 1);
+        if (~next) {
+          escapePos = next;
+          while (value.charCodeAt(escapePos - 1) === backslash) {
+            escapePos -= 1;
+            escape = !escape;
+          }
+        } else {
+          value += quote;
+          next = value.length - 1;
+          token.unclosed = true;
+        }
+      } while (escape);
+      token.value = value.slice(pos + 1, next);
+      token.sourceEndIndex = token.unclosed ? next : next + 1;
+      tokens.push(token);
+      pos = next + 1;
+      code = value.charCodeAt(pos);
+
+      // Comments
+    } else if (code === slash && value.charCodeAt(pos + 1) === star) {
+      next = value.indexOf("*/", pos);
+
+      token = {
+        type: "comment",
+        sourceIndex: pos,
+        sourceEndIndex: next + 2
+      };
+
+      if (next === -1) {
+        token.unclosed = true;
+        next = value.length;
+        token.sourceEndIndex = next;
+      }
+
+      token.value = value.slice(pos + 2, next);
+      tokens.push(token);
+
+      pos = next + 2;
+      code = value.charCodeAt(pos);
+
+      // Operation within calc
+    } else if (
+      (code === slash || code === star) &&
+      parent &&
+      parent.type === "function" &&
+      parent.value === "calc"
+    ) {
+      token = value[pos];
+      tokens.push({
+        type: "word",
+        sourceIndex: pos - before.length,
+        sourceEndIndex: pos + token.length,
+        value: token
+      });
+      pos += 1;
+      code = value.charCodeAt(pos);
+
+      // Dividers
+    } else if (code === slash || code === comma || code === colon) {
+      token = value[pos];
+
+      tokens.push({
+        type: "div",
+        sourceIndex: pos - before.length,
+        sourceEndIndex: pos + token.length,
+        value: token,
+        before: before,
+        after: ""
+      });
+      before = "";
+
+      pos += 1;
+      code = value.charCodeAt(pos);
+
+      // Open parentheses
+    } else if (openParentheses === code) {
+      // Whitespaces after open parentheses
+      next = pos;
+      do {
+        next += 1;
+        code = value.charCodeAt(next);
+      } while (code <= 32);
+      parenthesesOpenPos = pos;
+      token = {
+        type: "function",
+        sourceIndex: pos - name.length,
+        value: name,
+        before: value.slice(parenthesesOpenPos + 1, next)
+      };
+      pos = next;
+
+      if (name === "url" && code !== singleQuote && code !== doubleQuote) {
+        next -= 1;
+        do {
+          escape = false;
+          next = value.indexOf(")", next + 1);
+          if (~next) {
+            escapePos = next;
+            while (value.charCodeAt(escapePos - 1) === backslash) {
+              escapePos -= 1;
+              escape = !escape;
+            }
+          } else {
+            value += ")";
+            next = value.length - 1;
+            token.unclosed = true;
+          }
+        } while (escape);
+        // Whitespaces before closed
+        whitespacePos = next;
+        do {
+          whitespacePos -= 1;
+          code = value.charCodeAt(whitespacePos);
+        } while (code <= 32);
+        if (parenthesesOpenPos < whitespacePos) {
+          if (pos !== whitespacePos + 1) {
+            token.nodes = [
+              {
+                type: "word",
+                sourceIndex: pos,
+                sourceEndIndex: whitespacePos + 1,
+                value: value.slice(pos, whitespacePos + 1)
+              }
+            ];
+          } else {
+            token.nodes = [];
+          }
+          if (token.unclosed && whitespacePos + 1 !== next) {
+            token.after = "";
+            token.nodes.push({
+              type: "space",
+              sourceIndex: whitespacePos + 1,
+              sourceEndIndex: next,
+              value: value.slice(whitespacePos + 1, next)
+            });
+          } else {
+            token.after = value.slice(whitespacePos + 1, next);
+            token.sourceEndIndex = next;
+          }
+        } else {
+          token.after = "";
+          token.nodes = [];
+        }
+        pos = next + 1;
+        token.sourceEndIndex = token.unclosed ? next : pos;
+        code = value.charCodeAt(pos);
+        tokens.push(token);
+      } else {
+        balanced += 1;
+        token.after = "";
+        token.sourceEndIndex = pos + 1;
+        tokens.push(token);
+        stack.push(token);
+        tokens = token.nodes = [];
+        parent = token;
+      }
+      name = "";
+
+      // Close parentheses
+    } else if (closeParentheses === code && balanced) {
+      pos += 1;
+      code = value.charCodeAt(pos);
+
+      parent.after = after;
+      parent.sourceEndIndex += after.length;
+      after = "";
+      balanced -= 1;
+      stack[stack.length - 1].sourceEndIndex = pos;
+      stack.pop();
+      parent = stack[balanced];
+      tokens = parent.nodes;
+
+      // Words
+    } else {
+      next = pos;
+      do {
+        if (code === backslash) {
+          next += 1;
+        }
+        next += 1;
+        code = value.charCodeAt(next);
+      } while (
+        next < max &&
+        !(
+          code <= 32 ||
+          code === singleQuote ||
+          code === doubleQuote ||
+          code === comma ||
+          code === colon ||
+          code === slash ||
+          code === openParentheses ||
+          (code === star &&
+            parent &&
+            parent.type === "function" &&
+            parent.value === "calc") ||
+          (code === slash &&
+            parent.type === "function" &&
+            parent.value === "calc") ||
+          (code === closeParentheses && balanced)
+        )
+      );
+      token = value.slice(pos, next);
+
+      if (openParentheses === code) {
+        name = token;
+      } else if (
+        (uLower === token.charCodeAt(0) || uUpper === token.charCodeAt(0)) &&
+        plus === token.charCodeAt(1) &&
+        isUnicodeRange.test(token.slice(2))
+      ) {
+        tokens.push({
+          type: "unicode-range",
+          sourceIndex: pos,
+          sourceEndIndex: next,
+          value: token
+        });
+      } else {
+        tokens.push({
+          type: "word",
+          sourceIndex: pos,
+          sourceEndIndex: next,
+          value: token
+        });
+      }
+
+      pos = next;
+    }
+  }
+
+  for (pos = stack.length - 1; pos; pos -= 1) {
+    stack[pos].unclosed = true;
+    stack[pos].sourceEndIndex = value.length;
+  }
+
+  return stack[0].nodes;
+};