source: trip-planner-front/node_modules/source-map/dist/source-map.js@ ceaed42

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        if(typeof exports === 'object' && typeof module === 'object')
                module.exports = factory(require("fs"), require("path"));
        else if(typeof define === 'function' && define.amd)
                define(["fs", "path"], factory);
        else if(typeof exports === 'object')
                exports["sourceMap"] = factory(require("fs"), require("path"));
        else
                root["sourceMap"] = factory(root["fs"], root["path"]);
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/* 0 */
/***/ (function(module, exports) {

/* -*- Mode: js; js-indent-level: 2; -*- */
/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

/**
 * This is a helper function for getting values from parameter/options
 * objects.
 *
 * @param args The object we are extracting values from
 * @param name The name of the property we are getting.
 * @param defaultValue An optional value to return if the property is missing
 * from the object. If this is not specified and the property is missing, an
 * error will be thrown.
 */
function getArg(aArgs, aName, aDefaultValue) {
  if (aName in aArgs) {
    return aArgs[aName];
  } else if (arguments.length === 3) {
    return aDefaultValue;
  }
    throw new Error('"' + aName + '" is a required argument.');

}
exports.getArg = getArg;

const urlRegexp = /^(?:([\w+\-.]+):)?\/\/(?:(\w+:\w+)@)?([\w.-]*)(?::(\d+))?(.*)$/;
const dataUrlRegexp = /^data:.+\,.+$/;

function urlParse(aUrl) {
  const match = aUrl.match(urlRegexp);
  if (!match) {
    return null;
  }
  return {
    scheme: match[1],
    auth: match[2],
    host: match[3],
    port: match[4],
    path: match[5]
  };
}
exports.urlParse = urlParse;

function urlGenerate(aParsedUrl) {
  let url = "";
  if (aParsedUrl.scheme) {
    url += aParsedUrl.scheme + ":";
  }
  url += "//";
  if (aParsedUrl.auth) {
    url += aParsedUrl.auth + "@";
  }
  if (aParsedUrl.host) {
    url += aParsedUrl.host;
  }
  if (aParsedUrl.port) {
    url += ":" + aParsedUrl.port;
  }
  if (aParsedUrl.path) {
    url += aParsedUrl.path;
  }
  return url;
}
exports.urlGenerate = urlGenerate;

const MAX_CACHED_INPUTS = 32;

/**
 * Takes some function `f(input) -> result` and returns a memoized version of
 * `f`.
 *
 * We keep at most `MAX_CACHED_INPUTS` memoized results of `f` alive. The
 * memoization is a dumb-simple, linear least-recently-used cache.
 */
function lruMemoize(f) {
  const cache = [];

  return function(input) {
    for (let i = 0; i < cache.length; i++) {
      if (cache[i].input === input) {
        const temp = cache[0];
        cache[0] = cache[i];
        cache[i] = temp;
        return cache[0].result;
      }
    }

    const result = f(input);

    cache.unshift({
      input,
      result,
    });

    if (cache.length > MAX_CACHED_INPUTS) {
      cache.pop();
    }

    return result;
  };
}

/**
 * Normalizes a path, or the path portion of a URL:
 *
 * - Replaces consecutive slashes with one slash.
 * - Removes unnecessary '.' parts.
 * - Removes unnecessary '<dir>/..' parts.
 *
 * Based on code in the Node.js 'path' core module.
 *
 * @param aPath The path or url to normalize.
 */
const normalize = lruMemoize(function normalize(aPath) {
  let path = aPath;
  const url = urlParse(aPath);
  if (url) {
    if (!url.path) {
      return aPath;
    }
    path = url.path;
  }
  const isAbsolute = exports.isAbsolute(path);

  // Split the path into parts between `/` characters. This is much faster than
  // using `.split(/\/+/g)`.
  const parts = [];
  let start = 0;
  let i = 0;
  while (true) {
    start = i;
    i = path.indexOf("/", start);
    if (i === -1) {
      parts.push(path.slice(start));
      break;
    } else {
      parts.push(path.slice(start, i));
      while (i < path.length && path[i] === "/") {
        i++;
      }
    }
  }

  let up = 0;
  for (i = parts.length - 1; i >= 0; i--) {
    const part = parts[i];
    if (part === ".") {
      parts.splice(i, 1);
    } else if (part === "..") {
      up++;
    } else if (up > 0) {
      if (part === "") {
        // The first part is blank if the path is absolute. Trying to go
        // above the root is a no-op. Therefore we can remove all '..' parts
        // directly after the root.
        parts.splice(i + 1, up);
        up = 0;
      } else {
        parts.splice(i, 2);
        up--;
      }
    }
  }
  path = parts.join("/");

  if (path === "") {
    path = isAbsolute ? "/" : ".";
  }

  if (url) {
    url.path = path;
    return urlGenerate(url);
  }
  return path;
});
exports.normalize = normalize;

/**
 * Joins two paths/URLs.
 *
 * @param aRoot The root path or URL.
 * @param aPath The path or URL to be joined with the root.
 *
 * - If aPath is a URL or a data URI, aPath is returned, unless aPath is a
 *   scheme-relative URL: Then the scheme of aRoot, if any, is prepended
 *   first.
 * - Otherwise aPath is a path. If aRoot is a URL, then its path portion
 *   is updated with the result and aRoot is returned. Otherwise the result
 *   is returned.
 *   - If aPath is absolute, the result is aPath.
 *   - Otherwise the two paths are joined with a slash.
 * - Joining for example 'http://' and 'www.example.com' is also supported.
 */
function join(aRoot, aPath) {
  if (aRoot === "") {
    aRoot = ".";
  }
  if (aPath === "") {
    aPath = ".";
  }
  const aPathUrl = urlParse(aPath);
  const aRootUrl = urlParse(aRoot);
  if (aRootUrl) {
    aRoot = aRootUrl.path || "/";
  }

  // `join(foo, '//www.example.org')`
  if (aPathUrl && !aPathUrl.scheme) {
    if (aRootUrl) {
      aPathUrl.scheme = aRootUrl.scheme;
    }
    return urlGenerate(aPathUrl);
  }

  if (aPathUrl || aPath.match(dataUrlRegexp)) {
    return aPath;
  }

  // `join('http://', 'www.example.com')`
  if (aRootUrl && !aRootUrl.host && !aRootUrl.path) {
    aRootUrl.host = aPath;
    return urlGenerate(aRootUrl);
  }

  const joined = aPath.charAt(0) === "/"
    ? aPath
    : normalize(aRoot.replace(/\/+$/, "") + "/" + aPath);

  if (aRootUrl) {
    aRootUrl.path = joined;
    return urlGenerate(aRootUrl);
  }
  return joined;
}
exports.join = join;

exports.isAbsolute = function(aPath) {
  return aPath.charAt(0) === "/" || urlRegexp.test(aPath);
};

/**
 * Make a path relative to a URL or another path.
 *
 * @param aRoot The root path or URL.
 * @param aPath The path or URL to be made relative to aRoot.
 */
function relative(aRoot, aPath) {
  if (aRoot === "") {
    aRoot = ".";
  }

  aRoot = aRoot.replace(/\/$/, "");

  // It is possible for the path to be above the root. In this case, simply
  // checking whether the root is a prefix of the path won't work. Instead, we
  // need to remove components from the root one by one, until either we find
  // a prefix that fits, or we run out of components to remove.
  let level = 0;
  while (aPath.indexOf(aRoot + "/") !== 0) {
    const index = aRoot.lastIndexOf("/");
    if (index < 0) {
      return aPath;
    }

    // If the only part of the root that is left is the scheme (i.e. http://,
    // file:///, etc.), one or more slashes (/), or simply nothing at all, we
    // have exhausted all components, so the path is not relative to the root.
    aRoot = aRoot.slice(0, index);
    if (aRoot.match(/^([^\/]+:\/)?\/*$/)) {
      return aPath;
    }

    ++level;
  }

  // Make sure we add a "../" for each component we removed from the root.
  return Array(level + 1).join("../") + aPath.substr(aRoot.length + 1);
}
exports.relative = relative;

const supportsNullProto = (function() {
  const obj = Object.create(null);
  return !("__proto__" in obj);
}());

function identity(s) {
  return s;
}

/**
 * Because behavior goes wacky when you set `__proto__` on objects, we
 * have to prefix all the strings in our set with an arbitrary character.
 *
 * See https://github.com/mozilla/source-map/pull/31 and
 * https://github.com/mozilla/source-map/issues/30
 *
 * @param String aStr
 */
function toSetString(aStr) {
  if (isProtoString(aStr)) {
    return "$" + aStr;
  }

  return aStr;
}
exports.toSetString = supportsNullProto ? identity : toSetString;

function fromSetString(aStr) {
  if (isProtoString(aStr)) {
    return aStr.slice(1);
  }

  return aStr;
}
exports.fromSetString = supportsNullProto ? identity : fromSetString;

function isProtoString(s) {
  if (!s) {
    return false;
  }

  const length = s.length;

  if (length < 9 /* "__proto__".length */) {
    return false;
  }

  /* eslint-disable no-multi-spaces */
  if (s.charCodeAt(length - 1) !== 95  /* '_' */ ||
      s.charCodeAt(length - 2) !== 95  /* '_' */ ||
      s.charCodeAt(length - 3) !== 111 /* 'o' */ ||
      s.charCodeAt(length - 4) !== 116 /* 't' */ ||
      s.charCodeAt(length - 5) !== 111 /* 'o' */ ||
      s.charCodeAt(length - 6) !== 114 /* 'r' */ ||
      s.charCodeAt(length - 7) !== 112 /* 'p' */ ||
      s.charCodeAt(length - 8) !== 95  /* '_' */ ||
      s.charCodeAt(length - 9) !== 95  /* '_' */) {
    return false;
  }
  /* eslint-enable no-multi-spaces */

  for (let i = length - 10; i >= 0; i--) {
    if (s.charCodeAt(i) !== 36 /* '$' */) {
      return false;
    }
  }

  return true;
}

/**
 * Comparator between two mappings where the original positions are compared.
 *
 * Optionally pass in `true` as `onlyCompareGenerated` to consider two
 * mappings with the same original source/line/column, but different generated
 * line and column the same. Useful when searching for a mapping with a
 * stubbed out mapping.
 */
function compareByOriginalPositions(mappingA, mappingB, onlyCompareOriginal) {
  let cmp = strcmp(mappingA.source, mappingB.source);
  if (cmp !== 0) {
    return cmp;
  }

  cmp = mappingA.originalLine - mappingB.originalLine;
  if (cmp !== 0) {
    return cmp;
  }

  cmp = mappingA.originalColumn - mappingB.originalColumn;
  if (cmp !== 0 || onlyCompareOriginal) {
    return cmp;
  }

  cmp = mappingA.generatedColumn - mappingB.generatedColumn;
  if (cmp !== 0) {
    return cmp;
  }

  cmp = mappingA.generatedLine - mappingB.generatedLine;
  if (cmp !== 0) {
    return cmp;
  }

  return strcmp(mappingA.name, mappingB.name);
}
exports.compareByOriginalPositions = compareByOriginalPositions;

/**
 * Comparator between two mappings with deflated source and name indices where
 * the generated positions are compared.
 *
 * Optionally pass in `true` as `onlyCompareGenerated` to consider two
 * mappings with the same generated line and column, but different
 * source/name/original line and column the same. Useful when searching for a
 * mapping with a stubbed out mapping.
 */
function compareByGeneratedPositionsDeflated(mappingA, mappingB, onlyCompareGenerated) {
  let cmp = mappingA.generatedLine - mappingB.generatedLine;
  if (cmp !== 0) {
    return cmp;
  }

  cmp = mappingA.generatedColumn - mappingB.generatedColumn;
  if (cmp !== 0 || onlyCompareGenerated) {
    return cmp;
  }

  cmp = strcmp(mappingA.source, mappingB.source);
  if (cmp !== 0) {
    return cmp;
  }

  cmp = mappingA.originalLine - mappingB.originalLine;
  if (cmp !== 0) {
    return cmp;
  }

  cmp = mappingA.originalColumn - mappingB.originalColumn;
  if (cmp !== 0) {
    return cmp;
  }

  return strcmp(mappingA.name, mappingB.name);
}
exports.compareByGeneratedPositionsDeflated = compareByGeneratedPositionsDeflated;

function strcmp(aStr1, aStr2) {
  if (aStr1 === aStr2) {
    return 0;
  }

  if (aStr1 === null) {
    return 1; // aStr2 !== null
  }

  if (aStr2 === null) {
    return -1; // aStr1 !== null
  }

  if (aStr1 > aStr2) {
    return 1;
  }

  return -1;
}

/**
 * Comparator between two mappings with inflated source and name strings where
 * the generated positions are compared.
 */
function compareByGeneratedPositionsInflated(mappingA, mappingB) {
  let cmp = mappingA.generatedLine - mappingB.generatedLine;
  if (cmp !== 0) {
    return cmp;
  }

  cmp = mappingA.generatedColumn - mappingB.generatedColumn;
  if (cmp !== 0) {
    return cmp;
  }

  cmp = strcmp(mappingA.source, mappingB.source);
  if (cmp !== 0) {
    return cmp;
  }

  cmp = mappingA.originalLine - mappingB.originalLine;
  if (cmp !== 0) {
    return cmp;
  }

  cmp = mappingA.originalColumn - mappingB.originalColumn;
  if (cmp !== 0) {
    return cmp;
  }

  return strcmp(mappingA.name, mappingB.name);
}
exports.compareByGeneratedPositionsInflated = compareByGeneratedPositionsInflated;

/**
 * Strip any JSON XSSI avoidance prefix from the string (as documented
 * in the source maps specification), and then parse the string as
 * JSON.
 */
function parseSourceMapInput(str) {
  return JSON.parse(str.replace(/^\)]}'[^\n]*\n/, ""));
}
exports.parseSourceMapInput = parseSourceMapInput;

/**
 * Compute the URL of a source given the the source root, the source's
 * URL, and the source map's URL.
 */
function computeSourceURL(sourceRoot, sourceURL, sourceMapURL) {
  sourceURL = sourceURL || "";

  if (sourceRoot) {
    // This follows what Chrome does.
    if (sourceRoot[sourceRoot.length - 1] !== "/" && sourceURL[0] !== "/") {
      sourceRoot += "/";
    }
    // The spec says:
    //   Line 4: An optional source root, useful for relocating source
    //   files on a server or removing repeated values in the
    //   “sources” entry.  This value is prepended to the individual
    //   entries in the “source” field.
    sourceURL = sourceRoot + sourceURL;
  }

  // Historically, SourceMapConsumer did not take the sourceMapURL as
  // a parameter.  This mode is still somewhat supported, which is why
  // this code block is conditional.  However, it's preferable to pass
  // the source map URL to SourceMapConsumer, so that this function
  // can implement the source URL resolution algorithm as outlined in
  // the spec.  This block is basically the equivalent of:
  //    new URL(sourceURL, sourceMapURL).toString()
  // ... except it avoids using URL, which wasn't available in the
  // older releases of node still supported by this library.
  //
  // The spec says:
  //   If the sources are not absolute URLs after prepending of the
  //   “sourceRoot”, the sources are resolved relative to the
  //   SourceMap (like resolving script src in a html document).
  if (sourceMapURL) {
    const parsed = urlParse(sourceMapURL);
    if (!parsed) {
      throw new Error("sourceMapURL could not be parsed");
    }
    if (parsed.path) {
      // Strip the last path component, but keep the "/".
      const index = parsed.path.lastIndexOf("/");
      if (index >= 0) {
        parsed.path = parsed.path.substring(0, index + 1);
      }
    }
    sourceURL = join(urlGenerate(parsed), sourceURL);
  }

  return normalize(sourceURL);
}
exports.computeSourceURL = computeSourceURL;


/***/ }),
/* 1 */
/***/ (function(module, exports, __webpack_require__) {

/* -*- Mode: js; js-indent-level: 2; -*- */
/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

const base64VLQ = __webpack_require__(2);
const util = __webpack_require__(0);
const ArraySet = __webpack_require__(3).ArraySet;
const MappingList = __webpack_require__(7).MappingList;

/**
 * An instance of the SourceMapGenerator represents a source map which is
 * being built incrementally. You may pass an object with the following
 * properties:
 *
 *   - file: The filename of the generated source.
 *   - sourceRoot: A root for all relative URLs in this source map.
 */
class SourceMapGenerator {
  constructor(aArgs) {
    if (!aArgs) {
      aArgs = {};
    }
    this._file = util.getArg(aArgs, "file", null);
    this._sourceRoot = util.getArg(aArgs, "sourceRoot", null);
    this._skipValidation = util.getArg(aArgs, "skipValidation", false);
    this._sources = new ArraySet();
    this._names = new ArraySet();
    this._mappings = new MappingList();
    this._sourcesContents = null;
  }

  /**
   * Creates a new SourceMapGenerator based on a SourceMapConsumer
   *
   * @param aSourceMapConsumer The SourceMap.
   */
  static fromSourceMap(aSourceMapConsumer) {
    const sourceRoot = aSourceMapConsumer.sourceRoot;
    const generator = new SourceMapGenerator({
      file: aSourceMapConsumer.file,
      sourceRoot
    });
    aSourceMapConsumer.eachMapping(function(mapping) {
      const newMapping = {
        generated: {
          line: mapping.generatedLine,
          column: mapping.generatedColumn
        }
      };

      if (mapping.source != null) {
        newMapping.source = mapping.source;
        if (sourceRoot != null) {
          newMapping.source = util.relative(sourceRoot, newMapping.source);
        }

        newMapping.original = {
          line: mapping.originalLine,
          column: mapping.originalColumn
        };

        if (mapping.name != null) {
          newMapping.name = mapping.name;
        }
      }

      generator.addMapping(newMapping);
    });
    aSourceMapConsumer.sources.forEach(function(sourceFile) {
      let sourceRelative = sourceFile;
      if (sourceRoot !== null) {
        sourceRelative = util.relative(sourceRoot, sourceFile);
      }

      if (!generator._sources.has(sourceRelative)) {
        generator._sources.add(sourceRelative);
      }

      const content = aSourceMapConsumer.sourceContentFor(sourceFile);
      if (content != null) {
        generator.setSourceContent(sourceFile, content);
      }
    });
    return generator;
  }

  /**
   * Add a single mapping from original source line and column to the generated
   * source's line and column for this source map being created. The mapping
   * object should have the following properties:
   *
   *   - generated: An object with the generated line and column positions.
   *   - original: An object with the original line and column positions.
   *   - source: The original source file (relative to the sourceRoot).
   *   - name: An optional original token name for this mapping.
   */
  addMapping(aArgs) {
    const generated = util.getArg(aArgs, "generated");
    const original = util.getArg(aArgs, "original", null);
    let source = util.getArg(aArgs, "source", null);
    let name = util.getArg(aArgs, "name", null);

    if (!this._skipValidation) {
      this._validateMapping(generated, original, source, name);
    }

    if (source != null) {
      source = String(source);
      if (!this._sources.has(source)) {
        this._sources.add(source);
      }
    }

    if (name != null) {
      name = String(name);
      if (!this._names.has(name)) {
        this._names.add(name);
      }
    }

    this._mappings.add({
      generatedLine: generated.line,
      generatedColumn: generated.column,
      originalLine: original != null && original.line,
      originalColumn: original != null && original.column,
      source,
      name
    });
  }

  /**
   * Set the source content for a source file.
   */
  setSourceContent(aSourceFile, aSourceContent) {
    let source = aSourceFile;
    if (this._sourceRoot != null) {
      source = util.relative(this._sourceRoot, source);
    }

    if (aSourceContent != null) {
      // Add the source content to the _sourcesContents map.
      // Create a new _sourcesContents map if the property is null.
      if (!this._sourcesContents) {
        this._sourcesContents = Object.create(null);
      }
      this._sourcesContents[util.toSetString(source)] = aSourceContent;
    } else if (this._sourcesContents) {
      // Remove the source file from the _sourcesContents map.
      // If the _sourcesContents map is empty, set the property to null.
      delete this._sourcesContents[util.toSetString(source)];
      if (Object.keys(this._sourcesContents).length === 0) {
        this._sourcesContents = null;
      }
    }
  }

  /**
   * Applies the mappings of a sub-source-map for a specific source file to the
   * source map being generated. Each mapping to the supplied source file is
   * rewritten using the supplied source map. Note: The resolution for the
   * resulting mappings is the minimium of this map and the supplied map.
   *
   * @param aSourceMapConsumer The source map to be applied.
   * @param aSourceFile Optional. The filename of the source file.
   *        If omitted, SourceMapConsumer's file property will be used.
   * @param aSourceMapPath Optional. The dirname of the path to the source map
   *        to be applied. If relative, it is relative to the SourceMapConsumer.
   *        This parameter is needed when the two source maps aren't in the same
   *        directory, and the source map to be applied contains relative source
   *        paths. If so, those relative source paths need to be rewritten
   *        relative to the SourceMapGenerator.
   */
  applySourceMap(aSourceMapConsumer, aSourceFile, aSourceMapPath) {
    let sourceFile = aSourceFile;
    // If aSourceFile is omitted, we will use the file property of the SourceMap
    if (aSourceFile == null) {
      if (aSourceMapConsumer.file == null) {
        throw new Error(
          "SourceMapGenerator.prototype.applySourceMap requires either an explicit source file, " +
          'or the source map\'s "file" property. Both were omitted.'
        );
      }
      sourceFile = aSourceMapConsumer.file;
    }
    const sourceRoot = this._sourceRoot;
    // Make "sourceFile" relative if an absolute Url is passed.
    if (sourceRoot != null) {
      sourceFile = util.relative(sourceRoot, sourceFile);
    }
    // Applying the SourceMap can add and remove items from the sources and
    // the names array.
    const newSources = this._mappings.toArray().length > 0
      ? new ArraySet()
      : this._sources;
    const newNames = new ArraySet();

    // Find mappings for the "sourceFile"
    this._mappings.unsortedForEach(function(mapping) {
      if (mapping.source === sourceFile && mapping.originalLine != null) {
        // Check if it can be mapped by the source map, then update the mapping.
        const original = aSourceMapConsumer.originalPositionFor({
          line: mapping.originalLine,
          column: mapping.originalColumn
        });
        if (original.source != null) {
          // Copy mapping
          mapping.source = original.source;
          if (aSourceMapPath != null) {
            mapping.source = util.join(aSourceMapPath, mapping.source);
          }
          if (sourceRoot != null) {
            mapping.source = util.relative(sourceRoot, mapping.source);
          }
          mapping.originalLine = original.line;
          mapping.originalColumn = original.column;
          if (original.name != null) {
            mapping.name = original.name;
          }
        }
      }

      const source = mapping.source;
      if (source != null && !newSources.has(source)) {
        newSources.add(source);
      }

      const name = mapping.name;
      if (name != null && !newNames.has(name)) {
        newNames.add(name);
      }

    }, this);
    this._sources = newSources;
    this._names = newNames;

    // Copy sourcesContents of applied map.
    aSourceMapConsumer.sources.forEach(function(srcFile) {
      const content = aSourceMapConsumer.sourceContentFor(srcFile);
      if (content != null) {
        if (aSourceMapPath != null) {
          srcFile = util.join(aSourceMapPath, srcFile);
        }
        if (sourceRoot != null) {
          srcFile = util.relative(sourceRoot, srcFile);
        }
        this.setSourceContent(srcFile, content);
      }
    }, this);
  }

  /**
   * A mapping can have one of the three levels of data:
   *
   *   1. Just the generated position.
   *   2. The Generated position, original position, and original source.
   *   3. Generated and original position, original source, as well as a name
   *      token.
   *
   * To maintain consistency, we validate that any new mapping being added falls
   * in to one of these categories.
   */
  _validateMapping(aGenerated, aOriginal, aSource, aName) {
    // When aOriginal is truthy but has empty values for .line and .column,
    // it is most likely a programmer error. In this case we throw a very
    // specific error message to try to guide them the right way.
    // For example: https://github.com/Polymer/polymer-bundler/pull/519
    if (aOriginal && typeof aOriginal.line !== "number" && typeof aOriginal.column !== "number") {
        throw new Error(
            "original.line and original.column are not numbers -- you probably meant to omit " +
            "the original mapping entirely and only map the generated position. If so, pass " +
            "null for the original mapping instead of an object with empty or null values."
        );
    }

    if (aGenerated && "line" in aGenerated && "column" in aGenerated
        && aGenerated.line > 0 && aGenerated.column >= 0
        && !aOriginal && !aSource && !aName) {
      // Case 1.

    } else if (aGenerated && "line" in aGenerated && "column" in aGenerated
             && aOriginal && "line" in aOriginal && "column" in aOriginal
             && aGenerated.line > 0 && aGenerated.column >= 0
             && aOriginal.line > 0 && aOriginal.column >= 0
             && aSource) {
      // Cases 2 and 3.

    } else {
      throw new Error("Invalid mapping: " + JSON.stringify({
        generated: aGenerated,
        source: aSource,
        original: aOriginal,
        name: aName
      }));
    }
  }

  /**
   * Serialize the accumulated mappings in to the stream of base 64 VLQs
   * specified by the source map format.
   */
  _serializeMappings() {
    let previousGeneratedColumn = 0;
    let previousGeneratedLine = 1;
    let previousOriginalColumn = 0;
    let previousOriginalLine = 0;
    let previousName = 0;
    let previousSource = 0;
    let result = "";
    let next;
    let mapping;
    let nameIdx;
    let sourceIdx;

    const mappings = this._mappings.toArray();
    for (let i = 0, len = mappings.length; i < len; i++) {
      mapping = mappings[i];
      next = "";

      if (mapping.generatedLine !== previousGeneratedLine) {
        previousGeneratedColumn = 0;
        while (mapping.generatedLine !== previousGeneratedLine) {
          next += ";";
          previousGeneratedLine++;
        }
      } else if (i > 0) {
        if (!util.compareByGeneratedPositionsInflated(mapping, mappings[i - 1])) {
          continue;
        }
        next += ",";
      }

      next += base64VLQ.encode(mapping.generatedColumn
                                 - previousGeneratedColumn);
      previousGeneratedColumn = mapping.generatedColumn;

      if (mapping.source != null) {
        sourceIdx = this._sources.indexOf(mapping.source);
        next += base64VLQ.encode(sourceIdx - previousSource);
        previousSource = sourceIdx;

        // lines are stored 0-based in SourceMap spec version 3
        next += base64VLQ.encode(mapping.originalLine - 1
                                   - previousOriginalLine);
        previousOriginalLine = mapping.originalLine - 1;

        next += base64VLQ.encode(mapping.originalColumn
                                   - previousOriginalColumn);
        previousOriginalColumn = mapping.originalColumn;

        if (mapping.name != null) {
          nameIdx = this._names.indexOf(mapping.name);
          next += base64VLQ.encode(nameIdx - previousName);
          previousName = nameIdx;
        }
      }

      result += next;
    }

    return result;
  }

  _generateSourcesContent(aSources, aSourceRoot) {
    return aSources.map(function(source) {
      if (!this._sourcesContents) {
        return null;
      }
      if (aSourceRoot != null) {
        source = util.relative(aSourceRoot, source);
      }
      const key = util.toSetString(source);
      return Object.prototype.hasOwnProperty.call(this._sourcesContents, key)
        ? this._sourcesContents[key]
        : null;
    }, this);
  }

  /**
   * Externalize the source map.
   */
  toJSON() {
    const map = {
      version: this._version,
      sources: this._sources.toArray(),
      names: this._names.toArray(),
      mappings: this._serializeMappings()
    };
    if (this._file != null) {
      map.file = this._file;
    }
    if (this._sourceRoot != null) {
      map.sourceRoot = this._sourceRoot;
    }
    if (this._sourcesContents) {
      map.sourcesContent = this._generateSourcesContent(map.sources, map.sourceRoot);
    }

    return map;
  }

  /**
   * Render the source map being generated to a string.
   */
  toString() {
    return JSON.stringify(this.toJSON());
  }
}

SourceMapGenerator.prototype._version = 3;
exports.SourceMapGenerator = SourceMapGenerator;


/***/ }),
/* 2 */
/***/ (function(module, exports, __webpack_require__) {

/* -*- Mode: js; js-indent-level: 2; -*- */
/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 *
 * Based on the Base 64 VLQ implementation in Closure Compiler:
 * https://code.google.com/p/closure-compiler/source/browse/trunk/src/com/google/debugging/sourcemap/Base64VLQ.java
 *
 * Copyright 2011 The Closure Compiler Authors. 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 Google Inc. 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 THE COPYRIGHT
 * OWNER OR CONTRIBUTORS 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.
 */

const base64 = __webpack_require__(6);

// A single base 64 digit can contain 6 bits of data. For the base 64 variable
// length quantities we use in the source map spec, the first bit is the sign,
// the next four bits are the actual value, and the 6th bit is the
// continuation bit. The continuation bit tells us whether there are more
// digits in this value following this digit.
//
//   Continuation
//   |    Sign
//   |    |
//   V    V
//   101011

const VLQ_BASE_SHIFT = 5;

// binary: 100000
const VLQ_BASE = 1 << VLQ_BASE_SHIFT;

// binary: 011111
const VLQ_BASE_MASK = VLQ_BASE - 1;

// binary: 100000
const VLQ_CONTINUATION_BIT = VLQ_BASE;

/**
 * Converts from a two-complement value to a value where the sign bit is
 * placed in the least significant bit.  For example, as decimals:
 *   1 becomes 2 (10 binary), -1 becomes 3 (11 binary)
 *   2 becomes 4 (100 binary), -2 becomes 5 (101 binary)
 */
function toVLQSigned(aValue) {
  return aValue < 0
    ? ((-aValue) << 1) + 1
    : (aValue << 1) + 0;
}

/**
 * Converts to a two-complement value from a value where the sign bit is
 * placed in the least significant bit.  For example, as decimals:
 *   2 (10 binary) becomes 1, 3 (11 binary) becomes -1
 *   4 (100 binary) becomes 2, 5 (101 binary) becomes -2
 */
// eslint-disable-next-line no-unused-vars
function fromVLQSigned(aValue) {
  const isNegative = (aValue & 1) === 1;
  const shifted = aValue >> 1;
  return isNegative
    ? -shifted
    : shifted;
}

/**
 * Returns the base 64 VLQ encoded value.
 */
exports.encode = function base64VLQ_encode(aValue) {
  let encoded = "";
  let digit;

  let vlq = toVLQSigned(aValue);

  do {
    digit = vlq & VLQ_BASE_MASK;
    vlq >>>= VLQ_BASE_SHIFT;
    if (vlq > 0) {
      // There are still more digits in this value, so we must make sure the
      // continuation bit is marked.
      digit |= VLQ_CONTINUATION_BIT;
    }
    encoded += base64.encode(digit);
  } while (vlq > 0);

  return encoded;
};


/***/ }),
/* 3 */
/***/ (function(module, exports) {

/* -*- Mode: js; js-indent-level: 2; -*- */
/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

/**
 * A data structure which is a combination of an array and a set. Adding a new
 * member is O(1), testing for membership is O(1), and finding the index of an
 * element is O(1). Removing elements from the set is not supported. Only
 * strings are supported for membership.
 */
class ArraySet {
  constructor() {
    this._array = [];
    this._set = new Map();
  }

  /**
   * Static method for creating ArraySet instances from an existing array.
   */
  static fromArray(aArray, aAllowDuplicates) {
    const set = new ArraySet();
    for (let i = 0, len = aArray.length; i < len; i++) {
      set.add(aArray[i], aAllowDuplicates);
    }
    return set;
  }

  /**
   * Return how many unique items are in this ArraySet. If duplicates have been
   * added, than those do not count towards the size.
   *
   * @returns Number
   */
  size() {
    return this._set.size;
  }

  /**
   * Add the given string to this set.
   *
   * @param String aStr
   */
  add(aStr, aAllowDuplicates) {
    const isDuplicate = this.has(aStr);
    const idx = this._array.length;
    if (!isDuplicate || aAllowDuplicates) {
      this._array.push(aStr);
    }
    if (!isDuplicate) {
      this._set.set(aStr, idx);
    }
  }

  /**
   * Is the given string a member of this set?
   *
   * @param String aStr
   */
  has(aStr) {
      return this._set.has(aStr);
  }

  /**
   * What is the index of the given string in the array?
   *
   * @param String aStr
   */
  indexOf(aStr) {
    const idx = this._set.get(aStr);
    if (idx >= 0) {
        return idx;
    }
    throw new Error('"' + aStr + '" is not in the set.');
  }

  /**
   * What is the element at the given index?
   *
   * @param Number aIdx
   */
  at(aIdx) {
    if (aIdx >= 0 && aIdx < this._array.length) {
      return this._array[aIdx];
    }
    throw new Error("No element indexed by " + aIdx);
  }

  /**
   * Returns the array representation of this set (which has the proper indices
   * indicated by indexOf). Note that this is a copy of the internal array used
   * for storing the members so that no one can mess with internal state.
   */
  toArray() {
    return this._array.slice();
  }
}
exports.ArraySet = ArraySet;


/***/ }),
/* 4 */
/***/ (function(module, exports, __webpack_require__) {

/* WEBPACK VAR INJECTION */(function(__dirname) {if (typeof fetch === "function") {
  // Web version of reading a wasm file into an array buffer.

  let mappingsWasmUrl = null;

  module.exports = function readWasm() {
    if (typeof mappingsWasmUrl !== "string") {
      throw new Error("You must provide the URL of lib/mappings.wasm by calling " +
                      "SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) " +
                      "before using SourceMapConsumer");
    }

    return fetch(mappingsWasmUrl)
      .then(response => response.arrayBuffer());
  };

  module.exports.initialize = url => mappingsWasmUrl = url;
} else {
  // Node version of reading a wasm file into an array buffer.
  const fs = __webpack_require__(10);
  const path = __webpack_require__(11);

  module.exports = function readWasm() {
    return new Promise((resolve, reject) => {
      const wasmPath = path.join(__dirname, "mappings.wasm");
      fs.readFile(wasmPath, null, (error, data) => {
        if (error) {
          reject(error);
          return;
        }

        resolve(data.buffer);
      });
    });
  };

  module.exports.initialize = _ => {
    console.debug("SourceMapConsumer.initialize is a no-op when running in node.js");
  };
}

/* WEBPACK VAR INJECTION */}.call(exports, "/"))

/***/ }),
/* 5 */
/***/ (function(module, exports, __webpack_require__) {

/*
 * Copyright 2009-2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE.txt or:
 * http://opensource.org/licenses/BSD-3-Clause
 */
exports.SourceMapGenerator = __webpack_require__(1).SourceMapGenerator;
exports.SourceMapConsumer = __webpack_require__(8).SourceMapConsumer;
exports.SourceNode = __webpack_require__(13).SourceNode;


/***/ }),
/* 6 */
/***/ (function(module, exports) {

/* -*- Mode: js; js-indent-level: 2; -*- */
/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

const intToCharMap = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".split("");

/**
 * Encode an integer in the range of 0 to 63 to a single base 64 digit.
 */
exports.encode = function(number) {
  if (0 <= number && number < intToCharMap.length) {
    return intToCharMap[number];
  }
  throw new TypeError("Must be between 0 and 63: " + number);
};


/***/ }),
/* 7 */
/***/ (function(module, exports, __webpack_require__) {

/* -*- Mode: js; js-indent-level: 2; -*- */
/*
 * Copyright 2014 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

const util = __webpack_require__(0);

/**
 * Determine whether mappingB is after mappingA with respect to generated
 * position.
 */
function generatedPositionAfter(mappingA, mappingB) {
  // Optimized for most common case
  const lineA = mappingA.generatedLine;
  const lineB = mappingB.generatedLine;
  const columnA = mappingA.generatedColumn;
  const columnB = mappingB.generatedColumn;
  return lineB > lineA || lineB == lineA && columnB >= columnA ||
         util.compareByGeneratedPositionsInflated(mappingA, mappingB) <= 0;
}

/**
 * A data structure to provide a sorted view of accumulated mappings in a
 * performance conscious manner. It trades a negligible overhead in general
 * case for a large speedup in case of mappings being added in order.
 */
class MappingList {
  constructor() {
    this._array = [];
    this._sorted = true;
    // Serves as infimum
    this._last = {generatedLine: -1, generatedColumn: 0};
  }

  /**
   * Iterate through internal items. This method takes the same arguments that
   * `Array.prototype.forEach` takes.
   *
   * NOTE: The order of the mappings is NOT guaranteed.
   */
  unsortedForEach(aCallback, aThisArg) {
    this._array.forEach(aCallback, aThisArg);
  }

  /**
   * Add the given source mapping.
   *
   * @param Object aMapping
   */
  add(aMapping) {
    if (generatedPositionAfter(this._last, aMapping)) {
      this._last = aMapping;
      this._array.push(aMapping);
    } else {
      this._sorted = false;
      this._array.push(aMapping);
    }
  }

  /**
   * Returns the flat, sorted array of mappings. The mappings are sorted by
   * generated position.
   *
   * WARNING: This method returns internal data without copying, for
   * performance. The return value must NOT be mutated, and should be treated as
   * an immutable borrow. If you want to take ownership, you must make your own
   * copy.
   */
  toArray() {
    if (!this._sorted) {
      this._array.sort(util.compareByGeneratedPositionsInflated);
      this._sorted = true;
    }
    return this._array;
  }
}

exports.MappingList = MappingList;


/***/ }),
/* 8 */
/***/ (function(module, exports, __webpack_require__) {

/* -*- Mode: js; js-indent-level: 2; -*- */
/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

const util = __webpack_require__(0);
const binarySearch = __webpack_require__(9);
const ArraySet = __webpack_require__(3).ArraySet;
const base64VLQ = __webpack_require__(2); // eslint-disable-line no-unused-vars
const readWasm = __webpack_require__(4);
const wasm = __webpack_require__(12);

const INTERNAL = Symbol("smcInternal");

class SourceMapConsumer {
  constructor(aSourceMap, aSourceMapURL) {
    // If the constructor was called by super(), just return Promise<this>.
    // Yes, this is a hack to retain the pre-existing API of the base-class
    // constructor also being an async factory function.
    if (aSourceMap == INTERNAL) {
      return Promise.resolve(this);
    }

    return _factory(aSourceMap, aSourceMapURL);
  }

  static initialize(opts) {
    readWasm.initialize(opts["lib/mappings.wasm"]);
  }

  static fromSourceMap(aSourceMap, aSourceMapURL) {
    return _factoryBSM(aSourceMap, aSourceMapURL);
  }

  /**
   * Construct a new `SourceMapConsumer` from `rawSourceMap` and `sourceMapUrl`
   * (see the `SourceMapConsumer` constructor for details. Then, invoke the `async
   * function f(SourceMapConsumer) -> T` with the newly constructed consumer, wait
   * for `f` to complete, call `destroy` on the consumer, and return `f`'s return
   * value.
   *
   * You must not use the consumer after `f` completes!
   *
   * By using `with`, you do not have to remember to manually call `destroy` on
   * the consumer, since it will be called automatically once `f` completes.
   *
   * ```js
   * const xSquared = await SourceMapConsumer.with(
   *   myRawSourceMap,
   *   null,
   *   async function (consumer) {
   *     // Use `consumer` inside here and don't worry about remembering
   *     // to call `destroy`.
   *
   *     const x = await whatever(consumer);
   *     return x * x;
   *   }
   * );
   *
   * // You may not use that `consumer` anymore out here; it has
   * // been destroyed. But you can use `xSquared`.
   * console.log(xSquared);
   * ```
   */
  static with(rawSourceMap, sourceMapUrl, f) {
    // Note: The `acorn` version that `webpack` currently depends on doesn't
    // support `async` functions, and the nodes that we support don't all have
    // `.finally`. Therefore, this is written a bit more convolutedly than it
    // should really be.

    let consumer = null;
    const promise = new SourceMapConsumer(rawSourceMap, sourceMapUrl);
    return promise
      .then(c => {
        consumer = c;
        return f(c);
      })
      .then(x => {
        if (consumer) {
          consumer.destroy();
        }
        return x;
      }, e => {
        if (consumer) {
          consumer.destroy();
        }
        throw e;
      });
  }

  /**
   * Parse the mappings in a string in to a data structure which we can easily
   * query (the ordered arrays in the `this.__generatedMappings` and
   * `this.__originalMappings` properties).
   */
  _parseMappings(aStr, aSourceRoot) {
    throw new Error("Subclasses must implement _parseMappings");
  }

  /**
   * Iterate over each mapping between an original source/line/column and a
   * generated line/column in this source map.
   *
   * @param Function aCallback
   *        The function that is called with each mapping.
   * @param Object aContext
   *        Optional. If specified, this object will be the value of `this` every
   *        time that `aCallback` is called.
   * @param aOrder
   *        Either `SourceMapConsumer.GENERATED_ORDER` or
   *        `SourceMapConsumer.ORIGINAL_ORDER`. Specifies whether you want to
   *        iterate over the mappings sorted by the generated file's line/column
   *        order or the original's source/line/column order, respectively. Defaults to
   *        `SourceMapConsumer.GENERATED_ORDER`.
   */
  eachMapping(aCallback, aContext, aOrder) {
    throw new Error("Subclasses must implement eachMapping");
  }

  /**
   * Returns all generated line and column information for the original source,
   * line, and column provided. If no column is provided, returns all mappings
   * corresponding to a either the line we are searching for or the next
   * closest line that has any mappings. Otherwise, returns all mappings
   * corresponding to the given line and either the column we are searching for
   * or the next closest column that has any offsets.
   *
   * The only argument is an object with the following properties:
   *
   *   - source: The filename of the original source.
   *   - line: The line number in the original source.  The line number is 1-based.
   *   - column: Optional. the column number in the original source.
   *    The column number is 0-based.
   *
   * and an array of objects is returned, each with the following properties:
   *
   *   - line: The line number in the generated source, or null.  The
   *    line number is 1-based.
   *   - column: The column number in the generated source, or null.
   *    The column number is 0-based.
   */
  allGeneratedPositionsFor(aArgs) {
    throw new Error("Subclasses must implement allGeneratedPositionsFor");
  }

  destroy() {
    throw new Error("Subclasses must implement destroy");
  }
}

/**
 * The version of the source mapping spec that we are consuming.
 */
SourceMapConsumer.prototype._version = 3;
SourceMapConsumer.GENERATED_ORDER = 1;
SourceMapConsumer.ORIGINAL_ORDER = 2;

SourceMapConsumer.GREATEST_LOWER_BOUND = 1;
SourceMapConsumer.LEAST_UPPER_BOUND = 2;

exports.SourceMapConsumer = SourceMapConsumer;

/**
 * A BasicSourceMapConsumer instance represents a parsed source map which we can
 * query for information about the original file positions by giving it a file
 * position in the generated source.
 *
 * The first parameter is the raw source map (either as a JSON string, or
 * already parsed to an object). According to the spec, source maps have the
 * following attributes:
 *
 *   - version: Which version of the source map spec this map is following.
 *   - sources: An array of URLs to the original source files.
 *   - names: An array of identifiers which can be referenced by individual mappings.
 *   - sourceRoot: Optional. The URL root from which all sources are relative.
 *   - sourcesContent: Optional. An array of contents of the original source files.
 *   - mappings: A string of base64 VLQs which contain the actual mappings.
 *   - file: Optional. The generated file this source map is associated with.
 *
 * Here is an example source map, taken from the source map spec[0]:
 *
 *     {
 *       version : 3,
 *       file: "out.js",
 *       sourceRoot : "",
 *       sources: ["foo.js", "bar.js"],
 *       names: ["src", "maps", "are", "fun"],
 *       mappings: "AA,AB;;ABCDE;"
 *     }
 *
 * The second parameter, if given, is a string whose value is the URL
 * at which the source map was found.  This URL is used to compute the
 * sources array.
 *
 * [0]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit?pli=1#
 */
class BasicSourceMapConsumer extends SourceMapConsumer {
  constructor(aSourceMap, aSourceMapURL) {
    return super(INTERNAL).then(that => {
      let sourceMap = aSourceMap;
      if (typeof aSourceMap === "string") {
        sourceMap = util.parseSourceMapInput(aSourceMap);
      }

      const version = util.getArg(sourceMap, "version");
      let sources = util.getArg(sourceMap, "sources");
      // Sass 3.3 leaves out the 'names' array, so we deviate from the spec (which
      // requires the array) to play nice here.
      const names = util.getArg(sourceMap, "names", []);
      let sourceRoot = util.getArg(sourceMap, "sourceRoot", null);
      const sourcesContent = util.getArg(sourceMap, "sourcesContent", null);
      const mappings = util.getArg(sourceMap, "mappings");
      const file = util.getArg(sourceMap, "file", null);

      // Once again, Sass deviates from the spec and supplies the version as a
      // string rather than a number, so we use loose equality checking here.
      if (version != that._version) {
        throw new Error("Unsupported version: " + version);
      }

      if (sourceRoot) {
        sourceRoot = util.normalize(sourceRoot);
      }

      sources = sources
        .map(String)
        // Some source maps produce relative source paths like "./foo.js" instead of
        // "foo.js".  Normalize these first so that future comparisons will succeed.
        // See bugzil.la/1090768.
        .map(util.normalize)
        // Always ensure that absolute sources are internally stored relative to
        // the source root, if the source root is absolute. Not doing this would
        // be particularly problematic when the source root is a prefix of the
        // source (valid, but why??). See github issue #199 and bugzil.la/1188982.
        .map(function(source) {
          return sourceRoot && util.isAbsolute(sourceRoot) && util.isAbsolute(source)
            ? util.relative(sourceRoot, source)
            : source;
        });

      // Pass `true` below to allow duplicate names and sources. While source maps
      // are intended to be compressed and deduplicated, the TypeScript compiler
      // sometimes generates source maps with duplicates in them. See Github issue
      // #72 and bugzil.la/889492.
      that._names = ArraySet.fromArray(names.map(String), true);
      that._sources = ArraySet.fromArray(sources, true);

      that._absoluteSources = that._sources.toArray().map(function(s) {
        return util.computeSourceURL(sourceRoot, s, aSourceMapURL);
      });

      that.sourceRoot = sourceRoot;
      that.sourcesContent = sourcesContent;
      that._mappings = mappings;
      that._sourceMapURL = aSourceMapURL;
      that.file = file;

      that._computedColumnSpans = false;
      that._mappingsPtr = 0;
      that._wasm = null;

      return wasm().then(w => {
        that._wasm = w;
        return that;
      });
    });
  }

  /**
   * Utility function to find the index of a source.  Returns -1 if not
   * found.
   */
  _findSourceIndex(aSource) {
    let relativeSource = aSource;
    if (this.sourceRoot != null) {
      relativeSource = util.relative(this.sourceRoot, relativeSource);
    }

    if (this._sources.has(relativeSource)) {
      return this._sources.indexOf(relativeSource);
    }

    // Maybe aSource is an absolute URL as returned by |sources|.  In
    // this case we can't simply undo the transform.
    for (let i = 0; i < this._absoluteSources.length; ++i) {
      if (this._absoluteSources[i] == aSource) {
        return i;
      }
    }

    return -1;
  }

  /**
   * Create a BasicSourceMapConsumer from a SourceMapGenerator.
   *
   * @param SourceMapGenerator aSourceMap
   *        The source map that will be consumed.
   * @param String aSourceMapURL
   *        The URL at which the source map can be found (optional)
   * @returns BasicSourceMapConsumer
   */
  static fromSourceMap(aSourceMap, aSourceMapURL) {
    return new BasicSourceMapConsumer(aSourceMap.toString());
  }

  get sources() {
    return this._absoluteSources.slice();
  }

  _getMappingsPtr() {
    if (this._mappingsPtr === 0) {
      this._parseMappings(this._mappings, this.sourceRoot);
    }

    return this._mappingsPtr;
  }

  /**
   * Parse the mappings in a string in to a data structure which we can easily
   * query (the ordered arrays in the `this.__generatedMappings` and
   * `this.__originalMappings` properties).
   */
  _parseMappings(aStr, aSourceRoot) {
    const size = aStr.length;

    const mappingsBufPtr = this._wasm.exports.allocate_mappings(size);
    const mappingsBuf = new Uint8Array(this._wasm.exports.memory.buffer, mappingsBufPtr, size);
    for (let i = 0; i < size; i++) {
      mappingsBuf[i] = aStr.charCodeAt(i);
    }

    const mappingsPtr = this._wasm.exports.parse_mappings(mappingsBufPtr);

    if (!mappingsPtr) {
      const error = this._wasm.exports.get_last_error();
      let msg = `Error parsing mappings (code ${error}): `;

      // XXX: keep these error codes in sync with `fitzgen/source-map-mappings`.
      switch (error) {
        case 1:
          msg += "the mappings contained a negative line, column, source index, or name index";
          break;
        case 2:
          msg += "the mappings contained a number larger than 2**32";
          break;
        case 3:
          msg += "reached EOF while in the middle of parsing a VLQ";
          break;
        case 4:
          msg += "invalid base 64 character while parsing a VLQ";
          break;
        default:
          msg += "unknown error code";
          break;
      }

      throw new Error(msg);
    }

    this._mappingsPtr = mappingsPtr;
  }

  eachMapping(aCallback, aContext, aOrder) {
    const context = aContext || null;
    const order = aOrder || SourceMapConsumer.GENERATED_ORDER;
    const sourceRoot = this.sourceRoot;

    this._wasm.withMappingCallback(
      mapping => {
        if (mapping.source !== null) {
          mapping.source = this._sources.at(mapping.source);
          mapping.source = util.computeSourceURL(sourceRoot, mapping.source, this._sourceMapURL);

          if (mapping.name !== null) {
            mapping.name = this._names.at(mapping.name);
          }
        }

        aCallback.call(context, mapping);
      },
      () => {
        switch (order) {
        case SourceMapConsumer.GENERATED_ORDER:
          this._wasm.exports.by_generated_location(this._getMappingsPtr());
          break;
        case SourceMapConsumer.ORIGINAL_ORDER:
          this._wasm.exports.by_original_location(this._getMappingsPtr());
          break;
        default:
          throw new Error("Unknown order of iteration.");
        }
      }
    );
  }

  allGeneratedPositionsFor(aArgs) {
    let source = util.getArg(aArgs, "source");
    const originalLine = util.getArg(aArgs, "line");
    const originalColumn = aArgs.column || 0;

    source = this._findSourceIndex(source);
    if (source < 0) {
      return [];
    }

    if (originalLine < 1) {
      throw new Error("Line numbers must be >= 1");
    }

    if (originalColumn < 0) {
      throw new Error("Column numbers must be >= 0");
    }

    const mappings = [];

    this._wasm.withMappingCallback(
      m => {
        let lastColumn = m.lastGeneratedColumn;
        if (this._computedColumnSpans && lastColumn === null) {
          lastColumn = Infinity;
        }
        mappings.push({
          line: m.generatedLine,
          column: m.generatedColumn,
          lastColumn,
        });
      }, () => {
        this._wasm.exports.all_generated_locations_for(
          this._getMappingsPtr(),
          source,
          originalLine - 1,
          "column" in aArgs,
          originalColumn
        );
      }
    );

    return mappings;
  }

  destroy() {
    if (this._mappingsPtr !== 0) {
      this._wasm.exports.free_mappings(this._mappingsPtr);
      this._mappingsPtr = 0;
    }
  }

  /**
   * Compute the last column for each generated mapping. The last column is
   * inclusive.
   */
  computeColumnSpans() {
    if (this._computedColumnSpans) {
      return;
    }

    this._wasm.exports.compute_column_spans(this._getMappingsPtr());
    this._computedColumnSpans = true;
  }

  /**
   * Returns the original source, line, and column information for the generated
   * source's line and column positions provided. The only argument is an object
   * with the following properties:
   *
   *   - line: The line number in the generated source.  The line number
   *     is 1-based.
   *   - column: The column number in the generated source.  The column
   *     number is 0-based.
   *   - bias: Either 'SourceMapConsumer.GREATEST_LOWER_BOUND' or
   *     'SourceMapConsumer.LEAST_UPPER_BOUND'. Specifies whether to return the
   *     closest element that is smaller than or greater than the one we are
   *     searching for, respectively, if the exact element cannot be found.
   *     Defaults to 'SourceMapConsumer.GREATEST_LOWER_BOUND'.
   *
   * and an object is returned with the following properties:
   *
   *   - source: The original source file, or null.
   *   - line: The line number in the original source, or null.  The
   *     line number is 1-based.
   *   - column: The column number in the original source, or null.  The
   *     column number is 0-based.
   *   - name: The original identifier, or null.
   */
  originalPositionFor(aArgs) {
    const needle = {
      generatedLine: util.getArg(aArgs, "line"),
      generatedColumn: util.getArg(aArgs, "column")
    };

    if (needle.generatedLine < 1) {
      throw new Error("Line numbers must be >= 1");
    }

    if (needle.generatedColumn < 0) {
      throw new Error("Column numbers must be >= 0");
    }

    let bias = util.getArg(aArgs, "bias", SourceMapConsumer.GREATEST_LOWER_BOUND);
    if (bias == null) {
      bias = SourceMapConsumer.GREATEST_LOWER_BOUND;
    }

    let mapping;
    this._wasm.withMappingCallback(m => mapping = m, () => {
      this._wasm.exports.original_location_for(
        this._getMappingsPtr(),
        needle.generatedLine - 1,
        needle.generatedColumn,
        bias
      );
    });

    if (mapping) {
      if (mapping.generatedLine === needle.generatedLine) {
        let source = util.getArg(mapping, "source", null);
        if (source !== null) {
          source = this._sources.at(source);
          source = util.computeSourceURL(this.sourceRoot, source, this._sourceMapURL);
        }

        let name = util.getArg(mapping, "name", null);
        if (name !== null) {
          name = this._names.at(name);
        }

        return {
          source,
          line: util.getArg(mapping, "originalLine", null),
          column: util.getArg(mapping, "originalColumn", null),
          name
        };
      }
    }

    return {
      source: null,
      line: null,
      column: null,
      name: null
    };
  }

  /**
   * Return true if we have the source content for every source in the source
   * map, false otherwise.
   */
  hasContentsOfAllSources() {
    if (!this.sourcesContent) {
      return false;
    }
    return this.sourcesContent.length >= this._sources.size() &&
      !this.sourcesContent.some(function(sc) { return sc == null; });
  }

  /**
   * Returns the original source content. The only argument is the url of the
   * original source file. Returns null if no original source content is
   * available.
   */
  sourceContentFor(aSource, nullOnMissing) {
    if (!this.sourcesContent) {
      return null;
    }

    const index = this._findSourceIndex(aSource);
    if (index >= 0) {
      return this.sourcesContent[index];
    }

    let relativeSource = aSource;
    if (this.sourceRoot != null) {
      relativeSource = util.relative(this.sourceRoot, relativeSource);
    }

    let url;
    if (this.sourceRoot != null
        && (url = util.urlParse(this.sourceRoot))) {
      // XXX: file:// URIs and absolute paths lead to unexpected behavior for
      // many users. We can help them out when they expect file:// URIs to
      // behave like it would if they were running a local HTTP server. See
      // https://bugzilla.mozilla.org/show_bug.cgi?id=885597.
      const fileUriAbsPath = relativeSource.replace(/^file:\/\//, "");
      if (url.scheme == "file"
          && this._sources.has(fileUriAbsPath)) {
        return this.sourcesContent[this._sources.indexOf(fileUriAbsPath)];
      }

      if ((!url.path || url.path == "/")
          && this._sources.has("/" + relativeSource)) {
        return this.sourcesContent[this._sources.indexOf("/" + relativeSource)];
      }
    }

    // This function is used recursively from
    // IndexedSourceMapConsumer.prototype.sourceContentFor. In that case, we
    // don't want to throw if we can't find the source - we just want to
    // return null, so we provide a flag to exit gracefully.
    if (nullOnMissing) {
      return null;
    }

    throw new Error('"' + relativeSource + '" is not in the SourceMap.');
  }

  /**
   * Returns the generated line and column information for the original source,
   * line, and column positions provided. The only argument is an object with
   * the following properties:
   *
   *   - source: The filename of the original source.
   *   - line: The line number in the original source.  The line number
   *     is 1-based.
   *   - column: The column number in the original source.  The column
   *     number is 0-based.
   *   - bias: Either 'SourceMapConsumer.GREATEST_LOWER_BOUND' or
   *     'SourceMapConsumer.LEAST_UPPER_BOUND'. Specifies whether to return the
   *     closest element that is smaller than or greater than the one we are
   *     searching for, respectively, if the exact element cannot be found.
   *     Defaults to 'SourceMapConsumer.GREATEST_LOWER_BOUND'.
   *
   * and an object is returned with the following properties:
   *
   *   - line: The line number in the generated source, or null.  The
   *     line number is 1-based.
   *   - column: The column number in the generated source, or null.
   *     The column number is 0-based.
   */
  generatedPositionFor(aArgs) {
    let source = util.getArg(aArgs, "source");
    source = this._findSourceIndex(source);
    if (source < 0) {
      return {
        line: null,
        column: null,
        lastColumn: null
      };
    }

    const needle = {
      source,
      originalLine: util.getArg(aArgs, "line"),
      originalColumn: util.getArg(aArgs, "column")
    };

    if (needle.originalLine < 1) {
      throw new Error("Line numbers must be >= 1");
    }

    if (needle.originalColumn < 0) {
      throw new Error("Column numbers must be >= 0");
    }

    let bias = util.getArg(aArgs, "bias", SourceMapConsumer.GREATEST_LOWER_BOUND);
    if (bias == null) {
      bias = SourceMapConsumer.GREATEST_LOWER_BOUND;
    }

    let mapping;
    this._wasm.withMappingCallback(m => mapping = m, () => {
      this._wasm.exports.generated_location_for(
        this._getMappingsPtr(),
        needle.source,
        needle.originalLine - 1,
        needle.originalColumn,
        bias
      );
    });

    if (mapping) {
      if (mapping.source === needle.source) {
        let lastColumn = mapping.lastGeneratedColumn;
        if (this._computedColumnSpans && lastColumn === null) {
          lastColumn = Infinity;
        }
        return {
          line: util.getArg(mapping, "generatedLine", null),
          column: util.getArg(mapping, "generatedColumn", null),
          lastColumn,
        };
      }
    }

    return {
      line: null,
      column: null,
      lastColumn: null
    };
  }
}

BasicSourceMapConsumer.prototype.consumer = SourceMapConsumer;
exports.BasicSourceMapConsumer = BasicSourceMapConsumer;

/**
 * An IndexedSourceMapConsumer instance represents a parsed source map which
 * we can query for information. It differs from BasicSourceMapConsumer in
 * that it takes "indexed" source maps (i.e. ones with a "sections" field) as
 * input.
 *
 * The first parameter is a raw source map (either as a JSON string, or already
 * parsed to an object). According to the spec for indexed source maps, they
 * have the following attributes:
 *
 *   - version: Which version of the source map spec this map is following.
 *   - file: Optional. The generated file this source map is associated with.
 *   - sections: A list of section definitions.
 *
 * Each value under the "sections" field has two fields:
 *   - offset: The offset into the original specified at which this section
 *       begins to apply, defined as an object with a "line" and "column"
 *       field.
 *   - map: A source map definition. This source map could also be indexed,
 *       but doesn't have to be.
 *
 * Instead of the "map" field, it's also possible to have a "url" field
 * specifying a URL to retrieve a source map from, but that's currently
 * unsupported.
 *
 * Here's an example source map, taken from the source map spec[0], but
 * modified to omit a section which uses the "url" field.
 *
 *  {
 *    version : 3,
 *    file: "app.js",
 *    sections: [{
 *      offset: {line:100, column:10},
 *      map: {
 *        version : 3,
 *        file: "section.js",
 *        sources: ["foo.js", "bar.js"],
 *        names: ["src", "maps", "are", "fun"],
 *        mappings: "AAAA,E;;ABCDE;"
 *      }
 *    }],
 *  }
 *
 * The second parameter, if given, is a string whose value is the URL
 * at which the source map was found.  This URL is used to compute the
 * sources array.
 *
 * [0]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit#heading=h.535es3xeprgt
 */
class IndexedSourceMapConsumer extends SourceMapConsumer {
  constructor(aSourceMap, aSourceMapURL) {
    return super(INTERNAL).then(that => {
      let sourceMap = aSourceMap;
      if (typeof aSourceMap === "string") {
        sourceMap = util.parseSourceMapInput(aSourceMap);
      }

      const version = util.getArg(sourceMap, "version");
      const sections = util.getArg(sourceMap, "sections");

      if (version != that._version) {
        throw new Error("Unsupported version: " + version);
      }

      that._sources = new ArraySet();
      that._names = new ArraySet();
      that.__generatedMappings = null;
      that.__originalMappings = null;
      that.__generatedMappingsUnsorted = null;
      that.__originalMappingsUnsorted = null;

      let lastOffset = {
        line: -1,
        column: 0
      };
      return Promise.all(sections.map(s => {
        if (s.url) {
          // The url field will require support for asynchronicity.
          // See https://github.com/mozilla/source-map/issues/16
          throw new Error("Support for url field in sections not implemented.");
        }
        const offset = util.getArg(s, "offset");
        const offsetLine = util.getArg(offset, "line");
        const offsetColumn = util.getArg(offset, "column");

        if (offsetLine < lastOffset.line ||
            (offsetLine === lastOffset.line && offsetColumn < lastOffset.column)) {
          throw new Error("Section offsets must be ordered and non-overlapping.");
        }
        lastOffset = offset;

        const cons = new SourceMapConsumer(util.getArg(s, "map"), aSourceMapURL);
        return cons.then(consumer => {
          return {
            generatedOffset: {
              // The offset fields are 0-based, but we use 1-based indices when
              // encoding/decoding from VLQ.
              generatedLine: offsetLine + 1,
              generatedColumn: offsetColumn + 1
            },
            consumer
          };
        });
      })).then(s => {
        that._sections = s;
        return that;
      });
    });
  }

  // `__generatedMappings` and `__originalMappings` are arrays that hold the
  // parsed mapping coordinates from the source map's "mappings" attribute. They
  // are lazily instantiated, accessed via the `_generatedMappings` and
  // `_originalMappings` getters respectively, and we only parse the mappings
  // and create these arrays once queried for a source location. We jump through
  // these hoops because there can be many thousands of mappings, and parsing
  // them is expensive, so we only want to do it if we must.
  //
  // Each object in the arrays is of the form:
  //
  //     {
  //       generatedLine: The line number in the generated code,
  //       generatedColumn: The column number in the generated code,
  //       source: The path to the original source file that generated this
  //               chunk of code,
  //       originalLine: The line number in the original source that
  //                     corresponds to this chunk of generated code,
  //       originalColumn: The column number in the original source that
  //                       corresponds to this chunk of generated code,
  //       name: The name of the original symbol which generated this chunk of
  //             code.
  //     }
  //
  // All properties except for `generatedLine` and `generatedColumn` can be
  // `null`.
  //
  // `_generatedMappings` is ordered by the generated positions.
  //
  // `_originalMappings` is ordered by the original positions.
  get _generatedMappings() {
    if (!this.__generatedMappings) {
      this._sortGeneratedMappings();
    }

    return this.__generatedMappings;
  }

  get _originalMappings() {
    if (!this.__originalMappings) {
      this._sortOriginalMappings();
    }

    return this.__originalMappings;
  }

  get _generatedMappingsUnsorted() {
    if (!this.__generatedMappingsUnsorted) {
      this._parseMappings(this._mappings, this.sourceRoot);
    }

    return this.__generatedMappingsUnsorted;
  }

  get _originalMappingsUnsorted() {
    if (!this.__originalMappingsUnsorted) {
      this._parseMappings(this._mappings, this.sourceRoot);
    }

    return this.__originalMappingsUnsorted;
  }

  _sortGeneratedMappings() {
    const mappings = this._generatedMappingsUnsorted;
    mappings.sort(util.compareByGeneratedPositionsDeflated);
    this.__generatedMappings = mappings;
  }

  _sortOriginalMappings() {
    const mappings = this._originalMappingsUnsorted;
    mappings.sort(util.compareByOriginalPositions);
    this.__originalMappings = mappings;
  }

  /**
   * The list of original sources.
   */
  get sources() {
    const sources = [];
    for (let i = 0; i < this._sections.length; i++) {
      for (let j = 0; j < this._sections[i].consumer.sources.length; j++) {
        sources.push(this._sections[i].consumer.sources[j]);
      }
    }
    return sources;
  }

  /**
   * Returns the original source, line, and column information for the generated
   * source's line and column positions provided. The only argument is an object
   * with the following properties:
   *
   *   - line: The line number in the generated source.  The line number
   *     is 1-based.
   *   - column: The column number in the generated source.  The column
   *     number is 0-based.
   *
   * and an object is returned with the following properties:
   *
   *   - source: The original source file, or null.
   *   - line: The line number in the original source, or null.  The
   *     line number is 1-based.
   *   - column: The column number in the original source, or null.  The
   *     column number is 0-based.
   *   - name: The original identifier, or null.
   */
  originalPositionFor(aArgs) {
    const needle = {
      generatedLine: util.getArg(aArgs, "line"),
      generatedColumn: util.getArg(aArgs, "column")
    };

    // Find the section containing the generated position we're trying to map
    // to an original position.
    const sectionIndex = binarySearch.search(needle, this._sections,
      function(aNeedle, section) {
        const cmp = aNeedle.generatedLine - section.generatedOffset.generatedLine;
        if (cmp) {
          return cmp;
        }

        return (aNeedle.generatedColumn -
                section.generatedOffset.generatedColumn);
      });
    const section = this._sections[sectionIndex];

    if (!section) {
      return {
        source: null,
        line: null,
        column: null,
        name: null
      };
    }

    return section.consumer.originalPositionFor({
      line: needle.generatedLine -
        (section.generatedOffset.generatedLine - 1),
      column: needle.generatedColumn -
        (section.generatedOffset.generatedLine === needle.generatedLine
         ? section.generatedOffset.generatedColumn - 1
         : 0),
      bias: aArgs.bias
    });
  }

  /**
   * Return true if we have the source content for every source in the source
   * map, false otherwise.
   */
  hasContentsOfAllSources() {
    return this._sections.every(function(s) {
      return s.consumer.hasContentsOfAllSources();
    });
  }

  /**
   * Returns the original source content. The only argument is the url of the
   * original source file. Returns null if no original source content is
   * available.
   */
  sourceContentFor(aSource, nullOnMissing) {
    for (let i = 0; i < this._sections.length; i++) {
      const section = this._sections[i];

      const content = section.consumer.sourceContentFor(aSource, true);
      if (content) {
        return content;
      }
    }
    if (nullOnMissing) {
      return null;
    }
    throw new Error('"' + aSource + '" is not in the SourceMap.');
  }

  /**
   * Returns the generated line and column information for the original source,
   * line, and column positions provided. The only argument is an object with
   * the following properties:
   *
   *   - source: The filename of the original source.
   *   - line: The line number in the original source.  The line number
   *     is 1-based.
   *   - column: The column number in the original source.  The column
   *     number is 0-based.
   *
   * and an object is returned with the following properties:
   *
   *   - line: The line number in the generated source, or null.  The
   *     line number is 1-based.
   *   - column: The column number in the generated source, or null.
   *     The column number is 0-based.
   */
  generatedPositionFor(aArgs) {
    for (let i = 0; i < this._sections.length; i++) {
      const section = this._sections[i];

      // Only consider this section if the requested source is in the list of
      // sources of the consumer.
      if (section.consumer._findSourceIndex(util.getArg(aArgs, "source")) === -1) {
        continue;
      }
      const generatedPosition = section.consumer.generatedPositionFor(aArgs);
      if (generatedPosition) {
        const ret = {
          line: generatedPosition.line +
            (section.generatedOffset.generatedLine - 1),
          column: generatedPosition.column +
            (section.generatedOffset.generatedLine === generatedPosition.line
             ? section.generatedOffset.generatedColumn - 1
             : 0)
        };
        return ret;
      }
    }

    return {
      line: null,
      column: null
    };
  }

  /**
   * Parse the mappings in a string in to a data structure which we can easily
   * query (the ordered arrays in the `this.__generatedMappings` and
   * `this.__originalMappings` properties).
   */
  _parseMappings(aStr, aSourceRoot) {
    const generatedMappings = this.__generatedMappingsUnsorted = [];
    const originalMappings = this.__originalMappingsUnsorted = [];
    for (let i = 0; i < this._sections.length; i++) {
      const section = this._sections[i];

      const sectionMappings = [];
      section.consumer.eachMapping(m => sectionMappings.push(m));

      for (let j = 0; j < sectionMappings.length; j++) {
        const mapping = sectionMappings[j];

        // TODO: test if null is correct here.  The original code used
        // `source`, which would actually have gotten used as null because
        // var's get hoisted.
        // See: https://github.com/mozilla/source-map/issues/333
        let source = util.computeSourceURL(section.consumer.sourceRoot, null, this._sourceMapURL);
        this._sources.add(source);
        source = this._sources.indexOf(source);

        let name = null;
        if (mapping.name) {
          this._names.add(mapping.name);
          name = this._names.indexOf(mapping.name);
        }

        // The mappings coming from the consumer for the section have
        // generated positions relative to the start of the section, so we
        // need to offset them to be relative to the start of the concatenated
        // generated file.
        const adjustedMapping = {
          source,
          generatedLine: mapping.generatedLine +
            (section.generatedOffset.generatedLine - 1),
          generatedColumn: mapping.generatedColumn +
            (section.generatedOffset.generatedLine === mapping.generatedLine
            ? section.generatedOffset.generatedColumn - 1
            : 0),
          originalLine: mapping.originalLine,
          originalColumn: mapping.originalColumn,
          name
        };

        generatedMappings.push(adjustedMapping);
        if (typeof adjustedMapping.originalLine === "number") {
          originalMappings.push(adjustedMapping);
        }
      }
    }
  }

  eachMapping(aCallback, aContext, aOrder) {
    const context = aContext || null;
    const order = aOrder || SourceMapConsumer.GENERATED_ORDER;

    let mappings;
    switch (order) {
    case SourceMapConsumer.GENERATED_ORDER:
      mappings = this._generatedMappings;
      break;
    case SourceMapConsumer.ORIGINAL_ORDER:
      mappings = this._originalMappings;
      break;
    default:
      throw new Error("Unknown order of iteration.");
    }

    const sourceRoot = this.sourceRoot;
    mappings.map(function(mapping) {
      let source = null;
      if (mapping.source !== null) {
        source = this._sources.at(mapping.source);
        source = util.computeSourceURL(sourceRoot, source, this._sourceMapURL);
      }
      return {
        source,
        generatedLine: mapping.generatedLine,
        generatedColumn: mapping.generatedColumn,
        originalLine: mapping.originalLine,
        originalColumn: mapping.originalColumn,
        name: mapping.name === null ? null : this._names.at(mapping.name)
      };
    }, this).forEach(aCallback, context);
  }

  /**
   * Find the mapping that best matches the hypothetical "needle" mapping that
   * we are searching for in the given "haystack" of mappings.
   */
  _findMapping(aNeedle, aMappings, aLineName,
              aColumnName, aComparator, aBias) {
    // To return the position we are searching for, we must first find the
    // mapping for the given position and then return the opposite position it
    // points to. Because the mappings are sorted, we can use binary search to
    // find the best mapping.

    if (aNeedle[aLineName] <= 0) {
      throw new TypeError("Line must be greater than or equal to 1, got "
                          + aNeedle[aLineName]);
    }
    if (aNeedle[aColumnName] < 0) {
      throw new TypeError("Column must be greater than or equal to 0, got "
                          + aNeedle[aColumnName]);
    }

    return binarySearch.search(aNeedle, aMappings, aComparator, aBias);
  }

  allGeneratedPositionsFor(aArgs) {
    const line = util.getArg(aArgs, "line");

    // When there is no exact match, BasicSourceMapConsumer.prototype._findMapping
    // returns the index of the closest mapping less than the needle. By
    // setting needle.originalColumn to 0, we thus find the last mapping for
    // the given line, provided such a mapping exists.
    const needle = {
      source: util.getArg(aArgs, "source"),
      originalLine: line,
      originalColumn: util.getArg(aArgs, "column", 0)
    };

    needle.source = this._findSourceIndex(needle.source);
    if (needle.source < 0) {
      return [];
    }

    if (needle.originalLine < 1) {
      throw new Error("Line numbers must be >= 1");
    }

    if (needle.originalColumn < 0) {
      throw new Error("Column numbers must be >= 0");
    }

    const mappings = [];

    let index = this._findMapping(needle,
                                  this._originalMappings,
                                  "originalLine",
                                  "originalColumn",
                                  util.compareByOriginalPositions,
                                  binarySearch.LEAST_UPPER_BOUND);
    if (index >= 0) {
      let mapping = this._originalMappings[index];

      if (aArgs.column === undefined) {
        const originalLine = mapping.originalLine;

        // Iterate until either we run out of mappings, or we run into
        // a mapping for a different line than the one we found. Since
        // mappings are sorted, this is guaranteed to find all mappings for
        // the line we found.
        while (mapping && mapping.originalLine === originalLine) {
          let lastColumn = mapping.lastGeneratedColumn;
          if (this._computedColumnSpans && lastColumn === null) {
            lastColumn = Infinity;
          }
          mappings.push({
            line: util.getArg(mapping, "generatedLine", null),
            column: util.getArg(mapping, "generatedColumn", null),
            lastColumn,
          });

          mapping = this._originalMappings[++index];
        }
      } else {
        const originalColumn = mapping.originalColumn;

        // Iterate until either we run out of mappings, or we run into
        // a mapping for a different line than the one we were searching for.
        // Since mappings are sorted, this is guaranteed to find all mappings for
        // the line we are searching for.
        while (mapping &&
               mapping.originalLine === line &&
               mapping.originalColumn == originalColumn) {
          let lastColumn = mapping.lastGeneratedColumn;
          if (this._computedColumnSpans && lastColumn === null) {
            lastColumn = Infinity;
          }
          mappings.push({
            line: util.getArg(mapping, "generatedLine", null),
            column: util.getArg(mapping, "generatedColumn", null),
            lastColumn,
          });

          mapping = this._originalMappings[++index];
        }
      }
    }

    return mappings;
  }

  destroy() {
    for (let i = 0; i < this._sections.length; i++) {
      this._sections[i].consumer.destroy();
    }
  }
}
exports.IndexedSourceMapConsumer = IndexedSourceMapConsumer;

/*
 * Cheat to get around inter-twingled classes.  `factory()` can be at the end
 * where it has access to non-hoisted classes, but it gets hoisted itself.
 */
function _factory(aSourceMap, aSourceMapURL) {
  let sourceMap = aSourceMap;
  if (typeof aSourceMap === "string") {
    sourceMap = util.parseSourceMapInput(aSourceMap);
  }

  const consumer = sourceMap.sections != null
      ? new IndexedSourceMapConsumer(sourceMap, aSourceMapURL)
      : new BasicSourceMapConsumer(sourceMap, aSourceMapURL);
  return Promise.resolve(consumer);
}

function _factoryBSM(aSourceMap, aSourceMapURL) {
  return BasicSourceMapConsumer.fromSourceMap(aSourceMap, aSourceMapURL);
}


/***/ }),
/* 9 */
/***/ (function(module, exports) {

/* -*- Mode: js; js-indent-level: 2; -*- */
/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

exports.GREATEST_LOWER_BOUND = 1;
exports.LEAST_UPPER_BOUND = 2;

/**
 * Recursive implementation of binary search.
 *
 * @param aLow Indices here and lower do not contain the needle.
 * @param aHigh Indices here and higher do not contain the needle.
 * @param aNeedle The element being searched for.
 * @param aHaystack The non-empty array being searched.
 * @param aCompare Function which takes two elements and returns -1, 0, or 1.
 * @param aBias Either 'binarySearch.GREATEST_LOWER_BOUND' or
 *     'binarySearch.LEAST_UPPER_BOUND'. Specifies whether to return the
 *     closest element that is smaller than or greater than the one we are
 *     searching for, respectively, if the exact element cannot be found.
 */
function recursiveSearch(aLow, aHigh, aNeedle, aHaystack, aCompare, aBias) {
  // This function terminates when one of the following is true:
  //
  //   1. We find the exact element we are looking for.
  //
  //   2. We did not find the exact element, but we can return the index of
  //      the next-closest element.
  //
  //   3. We did not find the exact element, and there is no next-closest
  //      element than the one we are searching for, so we return -1.
  const mid = Math.floor((aHigh - aLow) / 2) + aLow;
  const cmp = aCompare(aNeedle, aHaystack[mid], true);
  if (cmp === 0) {
    // Found the element we are looking for.
    return mid;
  } else if (cmp > 0) {
    // Our needle is greater than aHaystack[mid].
    if (aHigh - mid > 1) {
      // The element is in the upper half.
      return recursiveSearch(mid, aHigh, aNeedle, aHaystack, aCompare, aBias);
    }

    // The exact needle element was not found in this haystack. Determine if
    // we are in termination case (3) or (2) and return the appropriate thing.
    if (aBias == exports.LEAST_UPPER_BOUND) {
      return aHigh < aHaystack.length ? aHigh : -1;
    }
    return mid;
  }

  // Our needle is less than aHaystack[mid].
  if (mid - aLow > 1) {
    // The element is in the lower half.
    return recursiveSearch(aLow, mid, aNeedle, aHaystack, aCompare, aBias);
  }

  // we are in termination case (3) or (2) and return the appropriate thing.
  if (aBias == exports.LEAST_UPPER_BOUND) {
    return mid;
  }
  return aLow < 0 ? -1 : aLow;
}

/**
 * This is an implementation of binary search which will always try and return
 * the index of the closest element if there is no exact hit. This is because
 * mappings between original and generated line/col pairs are single points,
 * and there is an implicit region between each of them, so a miss just means
 * that you aren't on the very start of a region.
 *
 * @param aNeedle The element you are looking for.
 * @param aHaystack The array that is being searched.
 * @param aCompare A function which takes the needle and an element in the
 *     array and returns -1, 0, or 1 depending on whether the needle is less
 *     than, equal to, or greater than the element, respectively.
 * @param aBias Either 'binarySearch.GREATEST_LOWER_BOUND' or
 *     'binarySearch.LEAST_UPPER_BOUND'. Specifies whether to return the
 *     closest element that is smaller than or greater than the one we are
 *     searching for, respectively, if the exact element cannot be found.
 *     Defaults to 'binarySearch.GREATEST_LOWER_BOUND'.
 */
exports.search = function search(aNeedle, aHaystack, aCompare, aBias) {
  if (aHaystack.length === 0) {
    return -1;
  }

  let index = recursiveSearch(-1, aHaystack.length, aNeedle, aHaystack,
                              aCompare, aBias || exports.GREATEST_LOWER_BOUND);
  if (index < 0) {
    return -1;
  }

  // We have found either the exact element, or the next-closest element than
  // the one we are searching for. However, there may be more than one such
  // element. Make sure we always return the smallest of these.
  while (index - 1 >= 0) {
    if (aCompare(aHaystack[index], aHaystack[index - 1], true) !== 0) {
      break;
    }
    --index;
  }

  return index;
};


/***/ }),
/* 10 */
/***/ (function(module, exports) {

module.exports = __WEBPACK_EXTERNAL_MODULE_10__;

/***/ }),
/* 11 */
/***/ (function(module, exports) {

module.exports = __WEBPACK_EXTERNAL_MODULE_11__;

/***/ }),
/* 12 */
/***/ (function(module, exports, __webpack_require__) {

const readWasm = __webpack_require__(4);

/**
 * Provide the JIT with a nice shape / hidden class.
 */
function Mapping() {
  this.generatedLine = 0;
  this.generatedColumn = 0;
  this.lastGeneratedColumn = null;
  this.source = null;
  this.originalLine = null;
  this.originalColumn = null;
  this.name = null;
}

let cachedWasm = null;

module.exports = function wasm() {
  if (cachedWasm) {
    return cachedWasm;
  }

  const callbackStack = [];

  cachedWasm = readWasm().then(buffer => {
      return WebAssembly.instantiate(buffer, {
        env: {
          mapping_callback(
            generatedLine,
            generatedColumn,

            hasLastGeneratedColumn,
            lastGeneratedColumn,

            hasOriginal,
            source,
            originalLine,
            originalColumn,

            hasName,
            name
          ) {
            const mapping = new Mapping();
            // JS uses 1-based line numbers, wasm uses 0-based.
            mapping.generatedLine = generatedLine + 1;
            mapping.generatedColumn = generatedColumn;

            if (hasLastGeneratedColumn) {
              // JS uses inclusive last generated column, wasm uses exclusive.
              mapping.lastGeneratedColumn = lastGeneratedColumn - 1;
            }

            if (hasOriginal) {
              mapping.source = source;
              // JS uses 1-based line numbers, wasm uses 0-based.
              mapping.originalLine = originalLine + 1;
              mapping.originalColumn = originalColumn;

              if (hasName) {
                mapping.name = name;
              }
            }

            callbackStack[callbackStack.length - 1](mapping);
          },

          start_all_generated_locations_for() { console.time("all_generated_locations_for"); },
          end_all_generated_locations_for() { console.timeEnd("all_generated_locations_for"); },

          start_compute_column_spans() { console.time("compute_column_spans"); },
          end_compute_column_spans() { console.timeEnd("compute_column_spans"); },

          start_generated_location_for() { console.time("generated_location_for"); },
          end_generated_location_for() { console.timeEnd("generated_location_for"); },

          start_original_location_for() { console.time("original_location_for"); },
          end_original_location_for() { console.timeEnd("original_location_for"); },

          start_parse_mappings() { console.time("parse_mappings"); },
          end_parse_mappings() { console.timeEnd("parse_mappings"); },

          start_sort_by_generated_location() { console.time("sort_by_generated_location"); },
          end_sort_by_generated_location() { console.timeEnd("sort_by_generated_location"); },

          start_sort_by_original_location() { console.time("sort_by_original_location"); },
          end_sort_by_original_location() { console.timeEnd("sort_by_original_location"); },
        }
      });
  }).then(Wasm => {
    return {
      exports: Wasm.instance.exports,
      withMappingCallback: (mappingCallback, f) => {
        callbackStack.push(mappingCallback);
        try {
          f();
        } finally {
          callbackStack.pop();
        }
      }
    };
  }).then(null, e => {
    cachedWasm = null;
    throw e;
  });

  return cachedWasm;
};


/***/ }),
/* 13 */
/***/ (function(module, exports, __webpack_require__) {

/* -*- Mode: js; js-indent-level: 2; -*- */
/*
 * Copyright 2011 Mozilla Foundation and contributors
 * Licensed under the New BSD license. See LICENSE or:
 * http://opensource.org/licenses/BSD-3-Clause
 */

const SourceMapGenerator = __webpack_require__(1).SourceMapGenerator;
const util = __webpack_require__(0);

// Matches a Windows-style `\r\n` newline or a `\n` newline used by all other
// operating systems these days (capturing the result).
const REGEX_NEWLINE = /(\r?\n)/;

// Newline character code for charCodeAt() comparisons
const NEWLINE_CODE = 10;

// Private symbol for identifying `SourceNode`s when multiple versions of
// the source-map library are loaded. This MUST NOT CHANGE across
// versions!
const isSourceNode = "$$$isSourceNode$$$";

/**
 * SourceNodes provide a way to abstract over interpolating/concatenating
 * snippets of generated JavaScript source code while maintaining the line and
 * column information associated with the original source code.
 *
 * @param aLine The original line number.
 * @param aColumn The original column number.
 * @param aSource The original source's filename.
 * @param aChunks Optional. An array of strings which are snippets of
 *        generated JS, or other SourceNodes.
 * @param aName The original identifier.
 */
class SourceNode {
  constructor(aLine, aColumn, aSource, aChunks, aName) {
    this.children = [];
    this.sourceContents = {};
    this.line = aLine == null ? null : aLine;
    this.column = aColumn == null ? null : aColumn;
    this.source = aSource == null ? null : aSource;
    this.name = aName == null ? null : aName;
    this[isSourceNode] = true;
    if (aChunks != null) this.add(aChunks);
  }

  /**
   * Creates a SourceNode from generated code and a SourceMapConsumer.
   *
   * @param aGeneratedCode The generated code
   * @param aSourceMapConsumer The SourceMap for the generated code
   * @param aRelativePath Optional. The path that relative sources in the
   *        SourceMapConsumer should be relative to.
   */
  static fromStringWithSourceMap(aGeneratedCode, aSourceMapConsumer, aRelativePath) {
    // The SourceNode we want to fill with the generated code
    // and the SourceMap
    const node = new SourceNode();

    // All even indices of this array are one line of the generated code,
    // while all odd indices are the newlines between two adjacent lines
    // (since `REGEX_NEWLINE` captures its match).
    // Processed fragments are accessed by calling `shiftNextLine`.
    const remainingLines = aGeneratedCode.split(REGEX_NEWLINE);
    let remainingLinesIndex = 0;
    const shiftNextLine = function() {
      const lineContents = getNextLine();
      // The last line of a file might not have a newline.
      const newLine = getNextLine() || "";
      return lineContents + newLine;

      function getNextLine() {
        return remainingLinesIndex < remainingLines.length ?
            remainingLines[remainingLinesIndex++] : undefined;
      }
    };

    // We need to remember the position of "remainingLines"
    let lastGeneratedLine = 1, lastGeneratedColumn = 0;

    // The generate SourceNodes we need a code range.
    // To extract it current and last mapping is used.
    // Here we store the last mapping.
    let lastMapping = null;
    let nextLine;

    aSourceMapConsumer.eachMapping(function(mapping) {
      if (lastMapping !== null) {
        // We add the code from "lastMapping" to "mapping":
        // First check if there is a new line in between.
        if (lastGeneratedLine < mapping.generatedLine) {
          // Associate first line with "lastMapping"
          addMappingWithCode(lastMapping, shiftNextLine());
          lastGeneratedLine++;
          lastGeneratedColumn = 0;
          // The remaining code is added without mapping
        } else {
          // There is no new line in between.
          // Associate the code between "lastGeneratedColumn" and
          // "mapping.generatedColumn" with "lastMapping"
          nextLine = remainingLines[remainingLinesIndex] || "";
          const code = nextLine.substr(0, mapping.generatedColumn -
                                        lastGeneratedColumn);
          remainingLines[remainingLinesIndex] = nextLine.substr(mapping.generatedColumn -
                                              lastGeneratedColumn);
          lastGeneratedColumn = mapping.generatedColumn;
          addMappingWithCode(lastMapping, code);
          // No more remaining code, continue
          lastMapping = mapping;
          return;
        }
      }
      // We add the generated code until the first mapping
      // to the SourceNode without any mapping.
      // Each line is added as separate string.
      while (lastGeneratedLine < mapping.generatedLine) {
        node.add(shiftNextLine());
        lastGeneratedLine++;
      }
      if (lastGeneratedColumn < mapping.generatedColumn) {
        nextLine = remainingLines[remainingLinesIndex] || "";
        node.add(nextLine.substr(0, mapping.generatedColumn));
        remainingLines[remainingLinesIndex] = nextLine.substr(mapping.generatedColumn);
        lastGeneratedColumn = mapping.generatedColumn;
      }
      lastMapping = mapping;
    }, this);
    // We have processed all mappings.
    if (remainingLinesIndex < remainingLines.length) {
      if (lastMapping) {
        // Associate the remaining code in the current line with "lastMapping"
        addMappingWithCode(lastMapping, shiftNextLine());
      }
      // and add the remaining lines without any mapping
      node.add(remainingLines.splice(remainingLinesIndex).join(""));
    }

    // Copy sourcesContent into SourceNode
    aSourceMapConsumer.sources.forEach(function(sourceFile) {
      const content = aSourceMapConsumer.sourceContentFor(sourceFile);
      if (content != null) {
        if (aRelativePath != null) {
          sourceFile = util.join(aRelativePath, sourceFile);
        }
        node.setSourceContent(sourceFile, content);
      }
    });

    return node;

    function addMappingWithCode(mapping, code) {
      if (mapping === null || mapping.source === undefined) {
        node.add(code);
      } else {
        const source = aRelativePath
          ? util.join(aRelativePath, mapping.source)
          : mapping.source;
        node.add(new SourceNode(mapping.originalLine,
                                mapping.originalColumn,
                                source,
                                code,
                                mapping.name));
      }
    }
  }

  /**
   * Add a chunk of generated JS to this source node.
   *
   * @param aChunk A string snippet of generated JS code, another instance of
   *        SourceNode, or an array where each member is one of those things.
   */
  add(aChunk) {
    if (Array.isArray(aChunk)) {
      aChunk.forEach(function(chunk) {
        this.add(chunk);
      }, this);
    } else if (aChunk[isSourceNode] || typeof aChunk === "string") {
      if (aChunk) {
        this.children.push(aChunk);
      }
    } else {
      throw new TypeError(
        "Expected a SourceNode, string, or an array of SourceNodes and strings. Got " + aChunk
      );
    }
    return this;
  }

  /**
   * Add a chunk of generated JS to the beginning of this source node.
   *
   * @param aChunk A string snippet of generated JS code, another instance of
   *        SourceNode, or an array where each member is one of those things.
   */
  prepend(aChunk) {
    if (Array.isArray(aChunk)) {
      for (let i = aChunk.length - 1; i >= 0; i--) {
        this.prepend(aChunk[i]);
      }
    } else if (aChunk[isSourceNode] || typeof aChunk === "string") {
      this.children.unshift(aChunk);
    } else {
      throw new TypeError(
        "Expected a SourceNode, string, or an array of SourceNodes and strings. Got " + aChunk
      );
    }
    return this;
  }

  /**
   * Walk over the tree of JS snippets in this node and its children. The
   * walking function is called once for each snippet of JS and is passed that
   * snippet and the its original associated source's line/column location.
   *
   * @param aFn The traversal function.
   */
  walk(aFn) {
    let chunk;
    for (let i = 0, len = this.children.length; i < len; i++) {
      chunk = this.children[i];
      if (chunk[isSourceNode]) {
        chunk.walk(aFn);
      } else if (chunk !== "") {
        aFn(chunk, { source: this.source,
                      line: this.line,
                      column: this.column,
                      name: this.name });
      }
    }
  }

  /**
   * Like `String.prototype.join` except for SourceNodes. Inserts `aStr` between
   * each of `this.children`.
   *
   * @param aSep The separator.
   */
  join(aSep) {
    let newChildren;
    let i;
    const len = this.children.length;
    if (len > 0) {
      newChildren = [];
      for (i = 0; i < len - 1; i++) {
        newChildren.push(this.children[i]);
        newChildren.push(aSep);
      }
      newChildren.push(this.children[i]);
      this.children = newChildren;
    }
    return this;
  }

  /**
   * Call String.prototype.replace on the very right-most source snippet. Useful
   * for trimming whitespace from the end of a source node, etc.
   *
   * @param aPattern The pattern to replace.
   * @param aReplacement The thing to replace the pattern with.
   */
  replaceRight(aPattern, aReplacement) {
    const lastChild = this.children[this.children.length - 1];
    if (lastChild[isSourceNode]) {
      lastChild.replaceRight(aPattern, aReplacement);
    } else if (typeof lastChild === "string") {
      this.children[this.children.length - 1] = lastChild.replace(aPattern, aReplacement);
    } else {
      this.children.push("".replace(aPattern, aReplacement));
    }
    return this;
  }

  /**
   * Set the source content for a source file. This will be added to the SourceMapGenerator
   * in the sourcesContent field.
   *
   * @param aSourceFile The filename of the source file
   * @param aSourceContent The content of the source file
   */
  setSourceContent(aSourceFile, aSourceContent) {
    this.sourceContents[util.toSetString(aSourceFile)] = aSourceContent;
  }

  /**
   * Walk over the tree of SourceNodes. The walking function is called for each
   * source file content and is passed the filename and source content.
   *
   * @param aFn The traversal function.
   */
  walkSourceContents(aFn) {
    for (let i = 0, len = this.children.length; i < len; i++) {
      if (this.children[i][isSourceNode]) {
        this.children[i].walkSourceContents(aFn);
      }
    }

    const sources = Object.keys(this.sourceContents);
    for (let i = 0, len = sources.length; i < len; i++) {
      aFn(util.fromSetString(sources[i]), this.sourceContents[sources[i]]);
    }
  }

  /**
   * Return the string representation of this source node. Walks over the tree
   * and concatenates all the various snippets together to one string.
   */
  toString() {
    let str = "";
    this.walk(function(chunk) {
      str += chunk;
    });
    return str;
  }

  /**
   * Returns the string representation of this source node along with a source
   * map.
   */
  toStringWithSourceMap(aArgs) {
    const generated = {
      code: "",
      line: 1,
      column: 0
    };
    const map = new SourceMapGenerator(aArgs);
    let sourceMappingActive = false;
    let lastOriginalSource = null;
    let lastOriginalLine = null;
    let lastOriginalColumn = null;
    let lastOriginalName = null;
    this.walk(function(chunk, original) {
      generated.code += chunk;
      if (original.source !== null
          && original.line !== null
          && original.column !== null) {
        if (lastOriginalSource !== original.source
          || lastOriginalLine !== original.line
          || lastOriginalColumn !== original.column
          || lastOriginalName !== original.name) {
          map.addMapping({
            source: original.source,
            original: {
              line: original.line,
              column: original.column
            },
            generated: {
              line: generated.line,
              column: generated.column
            },
            name: original.name
          });
        }
        lastOriginalSource = original.source;
        lastOriginalLine = original.line;
        lastOriginalColumn = original.column;
        lastOriginalName = original.name;
        sourceMappingActive = true;
      } else if (sourceMappingActive) {
        map.addMapping({
          generated: {
            line: generated.line,
            column: generated.column
          }
        });
        lastOriginalSource = null;
        sourceMappingActive = false;
      }
      for (let idx = 0, length = chunk.length; idx < length; idx++) {
        if (chunk.charCodeAt(idx) === NEWLINE_CODE) {
          generated.line++;
          generated.column = 0;
          // Mappings end at eol
          if (idx + 1 === length) {
            lastOriginalSource = null;
            sourceMappingActive = false;
          } else if (sourceMappingActive) {
            map.addMapping({
              source: original.source,
              original: {
                line: original.line,
                column: original.column
              },
              generated: {
                line: generated.line,
                column: generated.column
              },
              name: original.name
            });
          }
        } else {
          generated.column++;
        }
      }
    });
    this.walkSourceContents(function(sourceFile, sourceContent) {
      map.setSourceContent(sourceFile, sourceContent);
    });

    return { code: generated.code, map };
  }
}

exports.SourceNode = SourceNode;


/***/ })
/******/ ]);
});