Bug 918802 - Move debugger's pretty printing into a worker; r=past
☠☠ backed out by f2157693b1da ☠ ☠
authorNick Fitzgerald <fitzgen@gmail.com>
Mon, 30 Sep 2013 15:31:44 -0700
changeset 149349 d95ef98e7b05ddde7740af2f8f90ffa3ed0addad
parent 149348 14457fb49b983e8f0ad1c92ab67f13e5645262eb
child 149350 f2157693b1da4a5ed62fb1665c299cb6e5560145
push id25385
push useremorley@mozilla.com
push dateTue, 01 Oct 2013 09:25:32 +0000
treeherdermozilla-central@a55240c523be [default view] [failures only]
perfherder[talos] [build metrics] [platform microbench] (compared to previous push)
reviewerspast
bugs918802
milestone27.0a1
first release with
nightly linux32
nightly linux64
nightly mac
nightly win32
nightly win64
last release without
nightly linux32
nightly linux64
nightly mac
nightly win32
nightly win64
Bug 918802 - Move debugger's pretty printing into a worker; r=past
browser/devtools/debugger/test/browser.ini
browser/devtools/debugger/test/browser_dbg_pretty-print-07.js
browser/devtools/debugger/test/browser_dbg_pretty-print-08.js
browser/devtools/debugger/test/browser_dbg_pretty-print-09.js
browser/devtools/debugger/test/code_ugly-2.js
browser/devtools/debugger/test/code_ugly-3.js
browser/devtools/debugger/test/code_ugly-4.js
browser/devtools/debugger/test/doc_pretty-print-2.html
toolkit/devtools/DevToolsUtils.js
toolkit/devtools/DevToolsUtils.jsm
toolkit/devtools/escodegen/UPGRADING.md
toolkit/devtools/escodegen/escodegen.worker.js
toolkit/devtools/escodegen/moz.build
toolkit/devtools/server/actors/pretty-print-worker.js
toolkit/devtools/server/actors/script.js
toolkit/devtools/server/dbg-server.jsm
toolkit/devtools/server/tests/unit/test_pretty_print-01.js
toolkit/devtools/server/tests/unit/test_pretty_print-02.js
toolkit/devtools/server/tests/unit/test_pretty_print-03.js
toolkit/devtools/server/tests/unit/xpcshell.ini
toolkit/devtools/server/transport.js
toolkit/devtools/sourcemap/SourceMap.jsm
--- a/browser/devtools/debugger/test/browser.ini
+++ b/browser/devtools/debugger/test/browser.ini
@@ -97,16 +97,19 @@ support-files =
 [browser_dbg_pause-resume.js]
 [browser_dbg_pause-warning.js]
 [browser_dbg_pretty-print-01.js]
 [browser_dbg_pretty-print-02.js]
 [browser_dbg_pretty-print-03.js]
 [browser_dbg_pretty-print-04.js]
 [browser_dbg_pretty-print-05.js]
 [browser_dbg_pretty-print-06.js]
+[browser_dbg_pretty-print-07.js]
+[browser_dbg_pretty-print-08.js]
+[browser_dbg_pretty-print-09.js]
 [browser_dbg_progress-listener-bug.js]
 [browser_dbg_reload-preferred-script-01.js]
 [browser_dbg_reload-preferred-script-02.js]
 [browser_dbg_reload-preferred-script-03.js]
 [browser_dbg_reload-same-script.js]
 [browser_dbg_scripts-switching-01.js]
 [browser_dbg_scripts-switching-02.js]
 [browser_dbg_scripts-switching-03.js]
new file mode 100644
--- /dev/null
+++ b/browser/devtools/debugger/test/browser_dbg_pretty-print-07.js
@@ -0,0 +1,46 @@
+/* -*- Mode: javascript; js-indent-level: 2; -*- */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test basic pretty printing functionality. Would be an xpcshell test, except
+// for bug 921252.
+
+let gTab, gDebuggee, gPanel, gClient, gThreadClient;
+
+const TAB_URL = EXAMPLE_URL + "doc_pretty-print-2.html";
+
+function test() {
+  initDebugger(TAB_URL).then(([aTab, aDebuggee, aPanel]) => {
+    gTab = aTab;
+    gDebuggee = aDebuggee;
+    gPanel = aPanel;
+    gClient = gPanel.panelWin.gClient;
+    gThreadClient = gPanel.panelWin.DebuggerController.activeThread;
+
+    findSource();
+  });
+}
+
+function findSource() {
+  gThreadClient.getSources(({ error, sources }) => {
+    ok(!error);
+    sources = sources.filter(s => s.url.contains('code_ugly-2.js'));
+    is(sources.length, 1);
+    prettyPrintSource(sources[0]);
+  });
+}
+
+function prettyPrintSource(source) {
+  gThreadClient.source(source).prettyPrint(4, testPrettyPrinted);
+}
+
+function testPrettyPrinted({ error, source}) {
+  ok(!error);
+  ok(source.contains("\n    "));
+
+  closeDebuggerAndFinish(gPanel);
+}
+
+registerCleanupFunction(function() {
+  gTab = gDebuggee = gPanel = gClient = gThreadClient = null;
+});
new file mode 100644
--- /dev/null
+++ b/browser/devtools/debugger/test/browser_dbg_pretty-print-08.js
@@ -0,0 +1,95 @@
+/* -*- Mode: javascript; js-indent-level: 2; -*- */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test stepping through pretty printed sources.
+
+let gTab, gDebuggee, gPanel, gClient, gThreadClient, gSource;
+
+const TAB_URL = EXAMPLE_URL + "doc_pretty-print-2.html";
+
+function test() {
+  initDebugger(TAB_URL).then(([aTab, aDebuggee, aPanel]) => {
+    gTab = aTab;
+    gDebuggee = aDebuggee;
+    gPanel = aPanel;
+    gClient = gPanel.panelWin.gClient;
+    gThreadClient = gPanel.panelWin.DebuggerController.activeThread;
+
+    gDebuggee.noop = x => x;
+    findSource();
+  });
+}
+
+let CODE_URL;
+
+const BP_LOCATION = {
+  line: 5,
+  column: 11
+};
+
+function findSource() {
+  gThreadClient.getSources(({ error, sources }) => {
+    ok(!error);
+    sources = sources.filter(s => s.url.contains("code_ugly-3.js"));
+    is(sources.length, 1);
+    [gSource] = sources;
+    CODE_URL = BP_LOCATION.url = gSource.url;
+
+    prettyPrintSource(sources[0]);
+  });
+}
+
+function prettyPrintSource(source) {
+  gThreadClient.source(gSource).prettyPrint(2, runCode);
+}
+
+function runCode({ error }) {
+  ok(!error);
+  gClient.addOneTimeListener("paused", testDbgStatement);
+  gDebuggee.main3();
+}
+
+function testDbgStatement(event, { why, frame }) {
+  is(why.type, "debuggerStatement");
+  const { url, line, column } = frame.where;
+  is(url, CODE_URL);
+  is(line, 3);
+  setBreakpoint();
+}
+
+function setBreakpoint() {
+  gThreadClient.setBreakpoint(BP_LOCATION, ({ error, actualLocation }) => {
+    ok(!error);
+    ok(!actualLocation);
+    testStepping();
+  });
+}
+
+function testStepping() {
+  gClient.addOneTimeListener("paused", (event, { why, frame }) => {
+    is(why.type, "resumeLimit");
+    const { url, line } = frame.where;
+    is(url, CODE_URL);
+    is(line, 4);
+    testHitBreakpoint();
+  });
+  gThreadClient.stepIn();
+}
+
+function testHitBreakpoint() {
+  gClient.addOneTimeListener("paused", (event, { why, frame }) => {
+    is(why.type, "breakpoint");
+    const { url, line, column } = frame.where;
+    is(url, CODE_URL);
+    is(line, BP_LOCATION.line);
+    is(column, BP_LOCATION.column);
+
+    resumeDebuggerThenCloseAndFinish(gPanel);
+  });
+  gThreadClient.resume();
+}
+
+registerCleanupFunction(function() {
+  gTab = gDebuggee = gPanel = gClient = gThreadClient = gSource = null;
+});
new file mode 100644
--- /dev/null
+++ b/browser/devtools/debugger/test/browser_dbg_pretty-print-09.js
@@ -0,0 +1,73 @@
+/* -*- Mode: javascript; js-indent-level: 2; -*- */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test pretty printing source mapped sources.
+
+var gDebuggee;
+var gClient;
+var gThreadClient;
+var gSource;
+
+let gTab, gDebuggee, gPanel, gClient, gThreadClient;
+
+const TAB_URL = EXAMPLE_URL + "doc_pretty-print-2.html";
+
+function test() {
+  initDebugger(TAB_URL).then(([aTab, aDebuggee, aPanel]) => {
+    gTab = aTab;
+    gDebuggee = aDebuggee;
+    gPanel = aPanel;
+    gClient = gPanel.panelWin.gClient;
+    gThreadClient = gPanel.panelWin.DebuggerController.activeThread;
+
+    findSource();
+  });
+}
+
+const dataUrl = s => "data:text/javascript," + s;
+
+// These should match the instructions in code_ugly-4.js.
+const A = "function a(){b()}";
+const A_URL = dataUrl(A);
+const B = "function b(){debugger}";
+const B_URL = dataUrl(B);
+
+function findSource() {
+  gThreadClient.getSources(({ error, sources }) => {
+    ok(!error);
+    sources = sources.filter(s => s.url === B_URL);
+    is(sources.length, 1);
+    prettyPrint(sources[0]);
+  });
+}
+
+function prettyPrint(source) {
+  gThreadClient.source(source).prettyPrint(2, runCode);
+}
+
+function runCode({ error }) {
+  ok(!error);
+  gClient.addOneTimeListener("paused", testDbgStatement);
+  gDebuggee.a();
+}
+
+function testDbgStatement(event, { frame, why }) {
+  dump("FITZGEN: inside testDbgStatement\n");
+
+  try {
+    is(why.type, "debuggerStatement");
+    const { url, line, column } = frame.where;
+    is(url, B_URL);
+    is(line, 2);
+    is(column, 2);
+
+    resumeDebuggerThenCloseAndFinish(gPanel);
+  } catch (e) {
+    dump("FITZGEN: got an error! " + DevToolsUtils.safeErrorString(e) + "\n");
+  }
+}
+
+registerCleanupFunction(function() {
+  gTab = gDebuggee = gPanel = gClient = gThreadClient = null;
+});
new file mode 100644
--- /dev/null
+++ b/browser/devtools/debugger/test/code_ugly-2.js
@@ -0,0 +1,1 @@
+function main2() { var a = 1 + 3; var b = a++; return b + a; }
new file mode 100644
--- /dev/null
+++ b/browser/devtools/debugger/test/code_ugly-3.js
@@ -0,0 +1,1 @@
+function main3() { var a = 1; debugger; noop(a); return 10; };
new file mode 100644
--- /dev/null
+++ b/browser/devtools/debugger/test/code_ugly-4.js
@@ -0,0 +1,24 @@
+function a(){b()}function b(){debugger}
+//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoiYWJjLmpzIiwic291cmNlcyI6WyJkYXRhOnRleHQvamF2YXNjcmlwdCxmdW5jdGlvbiBhKCl7YigpfSIsImRhdGE6dGV4dC9qYXZhc2NyaXB0LGZ1bmN0aW9uIGIoKXtkZWJ1Z2dlcn0iXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6IkFBQUEsaUJDQUEsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMifQ==
+
+// Generate this file by evaluating the following in a browser-environment
+// scratchpad:
+//
+//    Components.utils.import('resource://gre/modules/devtools/SourceMap.jsm');
+//
+//    let dataUrl = s => "data:text/javascript," + s;
+//
+//    let A = "function a(){b()}";
+//    let A_URL = dataUrl(A);
+//    let B = "function b(){debugger}";
+//    let B_URL = dataUrl(B);
+//
+//    let result = (new SourceNode(null, null, null, [
+//      new SourceNode(1, 0, A_URL, A),
+//      B.split("").map((ch, i) => new SourceNode(1, i, B_URL, ch))
+//    ])).toStringWithSourceMap({
+//      file: "abc.js"
+//    });
+//
+//    result.code + "\n//# sourceMappingURL=data:application/json;base64," + btoa(JSON.stringify(result.map));
+
new file mode 100644
--- /dev/null
+++ b/browser/devtools/debugger/test/doc_pretty-print-2.html
@@ -0,0 +1,10 @@
+<!-- Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/ -->
+<!DOCTYPE html>
+<head>
+  <meta charset="utf-8"/>
+  <title>Debugger Pretty Printing Test Page</title>
+</head>
+<script src="code_ugly-2.js"></script>
+<script src="code_ugly-3.js"></script>
+<script src="code_ugly-4.js"></script>
--- a/toolkit/devtools/DevToolsUtils.js
+++ b/toolkit/devtools/DevToolsUtils.js
@@ -1,16 +1,19 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
 
 /* General utilities used throughout devtools. */
 
+let { Promise: promise } = Components.utils.import("resource://gre/modules/commonjs/sdk/core/promise.js", {});
+let { Services } = Components.utils.import("resource://gre/modules/Services.jsm", {});
+
 /**
  * Turn the error |aError| into a string, without fail.
  */
 this.safeErrorString = function safeErrorString(aError) {
   try {
     let errorString = aError.toString();
     if (typeof errorString === "string") {
       // Attempt to attach a stack to |errorString|. If it throws an error, or
@@ -74,8 +77,60 @@ this.makeInfallible = function makeInfal
       let who = "Handler function";
       if (aName) {
         who += " " + aName;
       }
       reportException(who, ex);
     }
   }
 }
+
+const executeSoon = aFn => {
+  Services.tm.mainThread.dispatch({
+    run: this.makeInfallible(aFn)
+  }, Components.interfaces.nsIThread.DISPATCH_NORMAL);
+}
+
+/**
+ * Like Array.prototype.forEach, but doesn't cause jankiness when iterating over
+ * very large arrays by yielding to the browser and continuing execution on the
+ * next tick.
+ *
+ * @param Array aArray
+ *        The array being iterated over.
+ * @param Function aFn
+ *        The function called on each item in the array.
+ * @returns Promise
+ *          A promise that is resolved once the whole array has been iterated
+ *          over.
+ */
+this.yieldingEach = function yieldingEach(aArray, aFn) {
+  const deferred = promise.defer();
+
+  let i = 0;
+  let len = aArray.length;
+
+  (function loop() {
+    const start = Date.now();
+
+    while (i < len) {
+      // Don't block the main thread for longer than 16 ms at a time. To
+      // maintain 60fps, you have to render every frame in at least 16ms; we
+      // aren't including time spent in non-JS here, but this is Good
+      // Enough(tm).
+      if (Date.now() - start > 16) {
+        executeSoon(loop);
+        return;
+      }
+
+      try {
+        aFn(aArray[i++]);
+      } catch (e) {
+        deferred.reject(e);
+        return;
+      }
+    }
+
+    deferred.resolve();
+  }());
+
+  return deferred.promise;
+}
--- a/toolkit/devtools/DevToolsUtils.jsm
+++ b/toolkit/devtools/DevToolsUtils.jsm
@@ -16,10 +16,11 @@ this.EXPORTED_SYMBOLS = [ "DevToolsUtils
 
 Components.classes["@mozilla.org/moz/jssubscript-loader;1"]
   .getService(Components.interfaces.mozIJSSubScriptLoader)
   .loadSubScript("resource://gre/modules/devtools/DevToolsUtils.js", this);
 
 this.DevToolsUtils = {
   safeErrorString: safeErrorString,
   reportException: reportException,
-  makeInfallible: makeInfallible
+  makeInfallible: makeInfallible,
+  yieldingEach: yieldingEach
 };
--- a/toolkit/devtools/escodegen/UPGRADING.md
+++ b/toolkit/devtools/escodegen/UPGRADING.md
@@ -25,8 +25,28 @@ loader:
        $ cp package.json /path/to/mozilla-central/toolkit/devtools/escodegen/package.json.js
 
 5. Prepend `module.exports = ` to the package.json file contents, so that the
 JSON data is exported, and we can load package.json as a module.
 
 6. Copy the estraverse.js that escodegen depends on into our tree:
 
        $ cp node_modules/estraverse/estraverse.js /path/to/mozilla-central/devtools/escodegen/estraverse.js
+
+7. Build the version of the escodegen that we can use in workers:
+
+   First we need to alias `self` as `window`:
+
+       $ echo 'let window = self;' >> /path/to/mozilla-central/toolkit/devtools/escodegen/escodegen.worker.js
+
+   Then we need to add the browser build of the source map library:
+
+       $ git clone https://github.com/mozilla/source-map
+       $ cd source-map
+       $ git co <latest release tag compatible with escodegen>
+       $ npm run-script build
+       $ cat dist/source-map.js >> /path/to/mozilla-central/toolkit/devtools/escodegen/escodegen.worker.js
+
+   Then we need to build the browser version of escodegen:
+
+       $ cd /path/to/escodegen
+       $ npm run-script build
+       $ cat escodegen.browser.js >> /path/to/mozilla-central/toolkit/devtools/escodegen/escodegen.worker.js
new file mode 100644
--- /dev/null
+++ b/toolkit/devtools/escodegen/escodegen.worker.js
@@ -0,0 +1,5539 @@
+let window = self;
+/* -*- 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
+ */
+
+/**
+ * Define a module along with a payload.
+ * @param {string} moduleName Name for the payload
+ * @param {ignored} deps Ignored. For compatibility with CommonJS AMD Spec
+ * @param {function} payload Function with (require, exports, module) params
+ */
+function define(moduleName, deps, payload) {
+  if (typeof moduleName != "string") {
+    throw new TypeError('Expected string, got: ' + moduleName);
+  }
+
+  if (arguments.length == 2) {
+    payload = deps;
+  }
+
+  if (moduleName in define.modules) {
+    throw new Error("Module already defined: " + moduleName);
+  }
+  define.modules[moduleName] = payload;
+};
+
+/**
+ * The global store of un-instantiated modules
+ */
+define.modules = {};
+
+
+/**
+ * We invoke require() in the context of a Domain so we can have multiple
+ * sets of modules running separate from each other.
+ * This contrasts with JSMs which are singletons, Domains allows us to
+ * optionally load a CommonJS module twice with separate data each time.
+ * Perhaps you want 2 command lines with a different set of commands in each,
+ * for example.
+ */
+function Domain() {
+  this.modules = {};
+  this._currentModule = null;
+}
+
+(function () {
+
+  /**
+   * Lookup module names and resolve them by calling the definition function if
+   * needed.
+   * There are 2 ways to call this, either with an array of dependencies and a
+   * callback to call when the dependencies are found (which can happen
+   * asynchronously in an in-page context) or with a single string an no callback
+   * where the dependency is resolved synchronously and returned.
+   * The API is designed to be compatible with the CommonJS AMD spec and
+   * RequireJS.
+   * @param {string[]|string} deps A name, or names for the payload
+   * @param {function|undefined} callback Function to call when the dependencies
+   * are resolved
+   * @return {undefined|object} The module required or undefined for
+   * array/callback method
+   */
+  Domain.prototype.require = function(deps, callback) {
+    if (Array.isArray(deps)) {
+      var params = deps.map(function(dep) {
+        return this.lookup(dep);
+      }, this);
+      if (callback) {
+        callback.apply(null, params);
+      }
+      return undefined;
+    }
+    else {
+      return this.lookup(deps);
+    }
+  };
+
+  function normalize(path) {
+    var bits = path.split('/');
+    var i = 1;
+    while (i < bits.length) {
+      if (bits[i] === '..') {
+        bits.splice(i-1, 1);
+      } else if (bits[i] === '.') {
+        bits.splice(i, 1);
+      } else {
+        i++;
+      }
+    }
+    return bits.join('/');
+  }
+
+  function join(a, b) {
+    a = a.trim();
+    b = b.trim();
+    if (/^\//.test(b)) {
+      return b;
+    } else {
+      return a.replace(/\/*$/, '/') + b;
+    }
+  }
+
+  function dirname(path) {
+    var bits = path.split('/');
+    bits.pop();
+    return bits.join('/');
+  }
+
+  /**
+   * Lookup module names and resolve them by calling the definition function if
+   * needed.
+   * @param {string} moduleName A name for the payload to lookup
+   * @return {object} The module specified by aModuleName or null if not found.
+   */
+  Domain.prototype.lookup = function(moduleName) {
+    if (/^\./.test(moduleName)) {
+      moduleName = normalize(join(dirname(this._currentModule), moduleName));
+    }
+
+    if (moduleName in this.modules) {
+      var module = this.modules[moduleName];
+      return module;
+    }
+
+    if (!(moduleName in define.modules)) {
+      throw new Error("Module not defined: " + moduleName);
+    }
+
+    var module = define.modules[moduleName];
+
+    if (typeof module == "function") {
+      var exports = {};
+      var previousModule = this._currentModule;
+      this._currentModule = moduleName;
+      module(this.require.bind(this), exports, { id: moduleName, uri: "" });
+      this._currentModule = previousModule;
+      module = exports;
+    }
+
+    // cache the resulting module object for next time
+    this.modules[moduleName] = module;
+
+    return module;
+  };
+
+}());
+
+define.Domain = Domain;
+define.globalDomain = new Domain();
+var require = define.globalDomain.require.bind(define.globalDomain);
+/* -*- 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
+ */
+define('source-map/source-map-generator', ['require', 'exports', 'module' ,  'source-map/base64-vlq', 'source-map/util', 'source-map/array-set'], function(require, exports, module) {
+
+  var base64VLQ = require('./base64-vlq');
+  var util = require('./util');
+  var ArraySet = require('./array-set').ArraySet;
+
+  /**
+   * An instance of the SourceMapGenerator represents a source map which is
+   * being built incrementally. To create a new one, you must pass an object
+   * with the following properties:
+   *
+   *   - file: The filename of the generated source.
+   *   - sourceRoot: An optional root for all URLs in this source map.
+   */
+  function SourceMapGenerator(aArgs) {
+    this._file = util.getArg(aArgs, 'file');
+    this._sourceRoot = util.getArg(aArgs, 'sourceRoot', null);
+    this._sources = new ArraySet();
+    this._names = new ArraySet();
+    this._mappings = [];
+    this._sourcesContents = null;
+  }
+
+  SourceMapGenerator.prototype._version = 3;
+
+  /**
+   * Creates a new SourceMapGenerator based on a SourceMapConsumer
+   *
+   * @param aSourceMapConsumer The SourceMap.
+   */
+  SourceMapGenerator.fromSourceMap =
+    function SourceMapGenerator_fromSourceMap(aSourceMapConsumer) {
+      var sourceRoot = aSourceMapConsumer.sourceRoot;
+      var generator = new SourceMapGenerator({
+        file: aSourceMapConsumer.file,
+        sourceRoot: sourceRoot
+      });
+      aSourceMapConsumer.eachMapping(function (mapping) {
+        var newMapping = {
+          generated: {
+            line: mapping.generatedLine,
+            column: mapping.generatedColumn
+          }
+        };
+
+        if (mapping.source) {
+          newMapping.source = mapping.source;
+          if (sourceRoot) {
+            newMapping.source = util.relative(sourceRoot, newMapping.source);
+          }
+
+          newMapping.original = {
+            line: mapping.originalLine,
+            column: mapping.originalColumn
+          };
+
+          if (mapping.name) {
+            newMapping.name = mapping.name;
+          }
+        }
+
+        generator.addMapping(newMapping);
+      });
+      aSourceMapConsumer.sources.forEach(function (sourceFile) {
+        var content = aSourceMapConsumer.sourceContentFor(sourceFile);
+        if (content) {
+          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.
+   */
+  SourceMapGenerator.prototype.addMapping =
+    function SourceMapGenerator_addMapping(aArgs) {
+      var generated = util.getArg(aArgs, 'generated');
+      var original = util.getArg(aArgs, 'original', null);
+      var source = util.getArg(aArgs, 'source', null);
+      var name = util.getArg(aArgs, 'name', null);
+
+      this._validateMapping(generated, original, source, name);
+
+      if (source && !this._sources.has(source)) {
+        this._sources.add(source);
+      }
+
+      if (name && !this._names.has(name)) {
+        this._names.add(name);
+      }
+
+      this._mappings.push({
+        generatedLine: generated.line,
+        generatedColumn: generated.column,
+        originalLine: original != null && original.line,
+        originalColumn: original != null && original.column,
+        source: source,
+        name: name
+      });
+    };
+
+  /**
+   * Set the source content for a source file.
+   */
+  SourceMapGenerator.prototype.setSourceContent =
+    function SourceMapGenerator_setSourceContent(aSourceFile, aSourceContent) {
+      var source = aSourceFile;
+      if (this._sourceRoot) {
+        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 = {};
+        }
+        this._sourcesContents[util.toSetString(source)] = aSourceContent;
+      } else {
+        // 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.
+   */
+  SourceMapGenerator.prototype.applySourceMap =
+    function SourceMapGenerator_applySourceMap(aSourceMapConsumer, aSourceFile) {
+      // If aSourceFile is omitted, we will use the file property of the SourceMap
+      if (!aSourceFile) {
+        aSourceFile = aSourceMapConsumer.file;
+      }
+      var sourceRoot = this._sourceRoot;
+      // Make "aSourceFile" relative if an absolute Url is passed.
+      if (sourceRoot) {
+        aSourceFile = util.relative(sourceRoot, aSourceFile);
+      }
+      // Applying the SourceMap can add and remove items from the sources and
+      // the names array.
+      var newSources = new ArraySet();
+      var newNames = new ArraySet();
+
+      // Find mappings for the "aSourceFile"
+      this._mappings.forEach(function (mapping) {
+        if (mapping.source === aSourceFile && mapping.originalLine) {
+          // Check if it can be mapped by the source map, then update the mapping.
+          var original = aSourceMapConsumer.originalPositionFor({
+            line: mapping.originalLine,
+            column: mapping.originalColumn
+          });
+          if (original.source !== null) {
+            // Copy mapping
+            if (sourceRoot) {
+              mapping.source = util.relative(sourceRoot, original.source);
+            } else {
+              mapping.source = original.source;
+            }
+            mapping.originalLine = original.line;
+            mapping.originalColumn = original.column;
+            if (original.name !== null && mapping.name !== null) {
+              // Only use the identifier name if it's an identifier
+              // in both SourceMaps
+              mapping.name = original.name;
+            }
+          }
+        }
+
+        var source = mapping.source;
+        if (source && !newSources.has(source)) {
+          newSources.add(source);
+        }
+
+        var name = mapping.name;
+        if (name && !newNames.has(name)) {
+          newNames.add(name);
+        }
+
+      }, this);
+      this._sources = newSources;
+      this._names = newNames;
+
+      // Copy sourcesContents of applied map.
+      aSourceMapConsumer.sources.forEach(function (sourceFile) {
+        var content = aSourceMapConsumer.sourceContentFor(sourceFile);
+        if (content) {
+          if (sourceRoot) {
+            sourceFile = util.relative(sourceRoot, sourceFile);
+          }
+          this.setSourceContent(sourceFile, 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.
+   */
+  SourceMapGenerator.prototype._validateMapping =
+    function SourceMapGenerator_validateMapping(aGenerated, aOriginal, aSource,
+                                                aName) {
+      if (aGenerated && 'line' in aGenerated && 'column' in aGenerated
+          && aGenerated.line > 0 && aGenerated.column >= 0
+          && !aOriginal && !aSource && !aName) {
+        // Case 1.
+        return;
+      }
+      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.
+        return;
+      }
+      else {
+        throw new Error('Invalid mapping: ' + JSON.stringify({
+          generated: aGenerated,
+          source: aSource,
+          orginal: aOriginal,
+          name: aName
+        }));
+      }
+    };
+
+  /**
+   * Serialize the accumulated mappings in to the stream of base 64 VLQs
+   * specified by the source map format.
+   */
+  SourceMapGenerator.prototype._serializeMappings =
+    function SourceMapGenerator_serializeMappings() {
+      var previousGeneratedColumn = 0;
+      var previousGeneratedLine = 1;
+      var previousOriginalColumn = 0;
+      var previousOriginalLine = 0;
+      var previousName = 0;
+      var previousSource = 0;
+      var result = '';
+      var mapping;
+
+      // The mappings must be guaranteed to be in sorted order before we start
+      // serializing them or else the generated line numbers (which are defined
+      // via the ';' separators) will be all messed up. Note: it might be more
+      // performant to maintain the sorting as we insert them, rather than as we
+      // serialize them, but the big O is the same either way.
+      this._mappings.sort(util.compareByGeneratedPositions);
+
+      for (var i = 0, len = this._mappings.length; i < len; i++) {
+        mapping = this._mappings[i];
+
+        if (mapping.generatedLine !== previousGeneratedLine) {
+          previousGeneratedColumn = 0;
+          while (mapping.generatedLine !== previousGeneratedLine) {
+            result += ';';
+            previousGeneratedLine++;
+          }
+        }
+        else {
+          if (i > 0) {
+            if (!util.compareByGeneratedPositions(mapping, this._mappings[i - 1])) {
+              continue;
+            }
+            result += ',';
+          }
+        }
+
+        result += base64VLQ.encode(mapping.generatedColumn
+                                   - previousGeneratedColumn);
+        previousGeneratedColumn = mapping.generatedColumn;
+
+        if (mapping.source) {
+          result += base64VLQ.encode(this._sources.indexOf(mapping.source)
+                                     - previousSource);
+          previousSource = this._sources.indexOf(mapping.source);
+
+          // lines are stored 0-based in SourceMap spec version 3
+          result += base64VLQ.encode(mapping.originalLine - 1
+                                     - previousOriginalLine);
+          previousOriginalLine = mapping.originalLine - 1;
+
+          result += base64VLQ.encode(mapping.originalColumn
+                                     - previousOriginalColumn);
+          previousOriginalColumn = mapping.originalColumn;
+
+          if (mapping.name) {
+            result += base64VLQ.encode(this._names.indexOf(mapping.name)
+                                       - previousName);
+            previousName = this._names.indexOf(mapping.name);
+          }
+        }
+      }
+
+      return result;
+    };
+
+  SourceMapGenerator.prototype._generateSourcesContent =
+    function SourceMapGenerator_generateSourcesContent(aSources, aSourceRoot) {
+      return aSources.map(function (source) {
+        if (!this._sourcesContents) {
+          return null;
+        }
+        if (aSourceRoot) {
+          source = util.relative(aSourceRoot, source);
+        }
+        var key = util.toSetString(source);
+        return Object.prototype.hasOwnProperty.call(this._sourcesContents,
+                                                    key)
+          ? this._sourcesContents[key]
+          : null;
+      }, this);
+    };
+
+  /**
+   * Externalize the source map.
+   */
+  SourceMapGenerator.prototype.toJSON =
+    function SourceMapGenerator_toJSON() {
+      var map = {
+        version: this._version,
+        file: this._file,
+        sources: this._sources.toArray(),
+        names: this._names.toArray(),
+        mappings: this._serializeMappings()
+      };
+      if (this._sourceRoot) {
+        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.
+   */
+  SourceMapGenerator.prototype.toString =
+    function SourceMapGenerator_toString() {
+      return JSON.stringify(this);
+    };
+
+  exports.SourceMapGenerator = SourceMapGenerator;
+
+});
+/* -*- 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.
+ */
+define('source-map/base64-vlq', ['require', 'exports', 'module' ,  'source-map/base64'], function(require, exports, module) {
+
+  var base64 = require('./base64');
+
+  // 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
+
+  var VLQ_BASE_SHIFT = 5;
+
+  // binary: 100000
+  var VLQ_BASE = 1 << VLQ_BASE_SHIFT;
+
+  // binary: 011111
+  var VLQ_BASE_MASK = VLQ_BASE - 1;
+
+  // binary: 100000
+  var VLQ_CONTINUATION_BIT = VLQ_BASE;
+
+  /**
+   * Converts from a two-complement value to a value where the sign bit is
+   * 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
+   * 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
+   */
+  function fromVLQSigned(aValue) {
+    var isNegative = (aValue & 1) === 1;
+    var shifted = aValue >> 1;
+    return isNegative
+      ? -shifted
+      : shifted;
+  }
+
+  /**
+   * Returns the base 64 VLQ encoded value.
+   */
+  exports.encode = function base64VLQ_encode(aValue) {
+    var encoded = "";
+    var digit;
+
+    var 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;
+  };
+
+  /**
+   * Decodes the next base 64 VLQ value from the given string and returns the
+   * value and the rest of the string.
+   */
+  exports.decode = function base64VLQ_decode(aStr) {
+    var i = 0;
+    var strLen = aStr.length;
+    var result = 0;
+    var shift = 0;
+    var continuation, digit;
+
+    do {
+      if (i >= strLen) {
+        throw new Error("Expected more digits in base 64 VLQ value.");
+      }
+      digit = base64.decode(aStr.charAt(i++));
+      continuation = !!(digit & VLQ_CONTINUATION_BIT);
+      digit &= VLQ_BASE_MASK;
+      result = result + (digit << shift);
+      shift += VLQ_BASE_SHIFT;
+    } while (continuation);
+
+    return {
+      value: fromVLQSigned(result),
+      rest: aStr.slice(i)
+    };
+  };
+
+});
+/* -*- 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
+ */
+define('source-map/base64', ['require', 'exports', 'module' , ], function(require, exports, module) {
+
+  var charToIntMap = {};
+  var intToCharMap = {};
+
+  'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
+    .split('')
+    .forEach(function (ch, index) {
+      charToIntMap[ch] = index;
+      intToCharMap[index] = ch;
+    });
+
+  /**
+   * Encode an integer in the range of 0 to 63 to a single base 64 digit.
+   */
+  exports.encode = function base64_encode(aNumber) {
+    if (aNumber in intToCharMap) {
+      return intToCharMap[aNumber];
+    }
+    throw new TypeError("Must be between 0 and 63: " + aNumber);
+  };
+
+  /**
+   * Decode a single base 64 digit to an integer.
+   */
+  exports.decode = function base64_decode(aChar) {
+    if (aChar in charToIntMap) {
+      return charToIntMap[aChar];
+    }
+    throw new TypeError("Not a valid base 64 digit: " + aChar);
+  };
+
+});
+/* -*- 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
+ */
+define('source-map/util', ['require', 'exports', 'module' , ], function(require, exports, module) {
+
+  /**
+   * 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;
+    } else {
+      throw new Error('"' + aName + '" is a required argument.');
+    }
+  }
+  exports.getArg = getArg;
+
+  var urlRegexp = /([\w+\-.]+):\/\/((\w+:\w+)@)?([\w.]+)?(:(\d+))?(\S+)?/;
+  var dataUrlRegexp = /^data:.+\,.+/;
+
+  function urlParse(aUrl) {
+    var match = aUrl.match(urlRegexp);
+    if (!match) {
+      return null;
+    }
+    return {
+      scheme: match[1],
+      auth: match[3],
+      host: match[4],
+      port: match[6],
+      path: match[7]
+    };
+  }
+  exports.urlParse = urlParse;
+
+  function urlGenerate(aParsedUrl) {
+    var url = aParsedUrl.scheme + "://";
+    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;
+
+  function join(aRoot, aPath) {
+    var url;
+
+    if (aPath.match(urlRegexp) || aPath.match(dataUrlRegexp)) {
+      return aPath;
+    }
+
+    if (aPath.charAt(0) === '/' && (url = urlParse(aRoot))) {
+      url.path = aPath;
+      return urlGenerate(url);
+    }
+
+    return aRoot.replace(/\/$/, '') + '/' + aPath;
+  }
+  exports.join = join;
+
+  /**
+   * 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) {
+    return '$' + aStr;
+  }
+  exports.toSetString = toSetString;
+
+  function fromSetString(aStr) {
+    return aStr.substr(1);
+  }
+  exports.fromSetString = fromSetString;
+
+  function relative(aRoot, aPath) {
+    aRoot = aRoot.replace(/\/$/, '');
+
+    var url = urlParse(aRoot);
+    if (aPath.charAt(0) == "/" && url && url.path == "/") {
+      return aPath.slice(1);
+    }
+
+    return aPath.indexOf(aRoot + '/') === 0
+      ? aPath.substr(aRoot.length + 1)
+      : aPath;
+  }
+  exports.relative = relative;
+
+  function strcmp(aStr1, aStr2) {
+    var s1 = aStr1 || "";
+    var s2 = aStr2 || "";
+    return (s1 > s2) - (s1 < s2);
+  }
+
+  /**
+   * 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) {
+    var cmp;
+
+    cmp = strcmp(mappingA.source, mappingB.source);
+    if (cmp) {
+      return cmp;
+    }
+
+    cmp = mappingA.originalLine - mappingB.originalLine;
+    if (cmp) {
+      return cmp;
+    }
+
+    cmp = mappingA.originalColumn - mappingB.originalColumn;
+    if (cmp || onlyCompareOriginal) {
+      return cmp;
+    }
+
+    cmp = strcmp(mappingA.name, mappingB.name);
+    if (cmp) {
+      return cmp;
+    }
+
+    cmp = mappingA.generatedLine - mappingB.generatedLine;
+    if (cmp) {
+      return cmp;
+    }
+
+    return mappingA.generatedColumn - mappingB.generatedColumn;
+  };
+  exports.compareByOriginalPositions = compareByOriginalPositions;
+
+  /**
+   * Comparator between two mappings 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 compareByGeneratedPositions(mappingA, mappingB, onlyCompareGenerated) {
+    var cmp;
+
+    cmp = mappingA.generatedLine - mappingB.generatedLine;
+    if (cmp) {
+      return cmp;
+    }
+
+    cmp = mappingA.generatedColumn - mappingB.generatedColumn;
+    if (cmp || onlyCompareGenerated) {
+      return cmp;
+    }
+
+    cmp = strcmp(mappingA.source, mappingB.source);
+    if (cmp) {
+      return cmp;
+    }
+
+    cmp = mappingA.originalLine - mappingB.originalLine;
+    if (cmp) {
+      return cmp;
+    }
+
+    cmp = mappingA.originalColumn - mappingB.originalColumn;
+    if (cmp) {
+      return cmp;
+    }
+
+    return strcmp(mappingA.name, mappingB.name);
+  };
+  exports.compareByGeneratedPositions = compareByGeneratedPositions;
+
+});
+/* -*- 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
+ */
+define('source-map/array-set', ['require', 'exports', 'module' ,  'source-map/util'], function(require, exports, module) {
+
+  var util = require('./util');
+
+  /**
+   * 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.
+   */
+  function ArraySet() {
+    this._array = [];
+    this._set = {};
+  }
+
+  /**
+   * Static method for creating ArraySet instances from an existing array.
+   */
+  ArraySet.fromArray = function ArraySet_fromArray(aArray, aAllowDuplicates) {
+    var set = new ArraySet();
+    for (var i = 0, len = aArray.length; i < len; i++) {
+      set.add(aArray[i], aAllowDuplicates);
+    }
+    return set;
+  };
+
+  /**
+   * Add the given string to this set.
+   *
+   * @param String aStr
+   */
+  ArraySet.prototype.add = function ArraySet_add(aStr, aAllowDuplicates) {
+    var isDuplicate = this.has(aStr);
+    var idx = this._array.length;
+    if (!isDuplicate || aAllowDuplicates) {
+      this._array.push(aStr);
+    }
+    if (!isDuplicate) {
+      this._set[util.toSetString(aStr)] = idx;
+    }
+  };
+
+  /**
+   * Is the given string a member of this set?
+   *
+   * @param String aStr
+   */
+  ArraySet.prototype.has = function ArraySet_has(aStr) {
+    return Object.prototype.hasOwnProperty.call(this._set,
+                                                util.toSetString(aStr));
+  };
+
+  /**
+   * What is the index of the given string in the array?
+   *
+   * @param String aStr
+   */
+  ArraySet.prototype.indexOf = function ArraySet_indexOf(aStr) {
+    if (this.has(aStr)) {
+      return this._set[util.toSetString(aStr)];
+    }
+    throw new Error('"' + aStr + '" is not in the set.');
+  };
+
+  /**
+   * What is the element at the given index?
+   *
+   * @param Number aIdx
+   */
+  ArraySet.prototype.at = function ArraySet_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.
+   */
+  ArraySet.prototype.toArray = function ArraySet_toArray() {
+    return this._array.slice();
+  };
+
+  exports.ArraySet = ArraySet;
+
+});
+/* -*- 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
+ */
+define('source-map/source-map-consumer', ['require', 'exports', 'module' ,  'source-map/util', 'source-map/binary-search', 'source-map/array-set', 'source-map/base64-vlq'], function(require, exports, module) {
+
+  var util = require('./util');
+  var binarySearch = require('./binary-search');
+  var ArraySet = require('./array-set').ArraySet;
+  var base64VLQ = require('./base64-vlq');
+
+  /**
+   * A SourceMapConsumer 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 only 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 referrenced 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: 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;"
+   *     }
+   *
+   * [0]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit?pli=1#
+   */
+  function SourceMapConsumer(aSourceMap) {
+    var sourceMap = aSourceMap;
+    if (typeof aSourceMap === 'string') {
+      sourceMap = JSON.parse(aSourceMap.replace(/^\)\]\}'/, ''));
+    }
+
+    var version = util.getArg(sourceMap, 'version');
+    var sources = util.getArg(sourceMap, 'sources');
+    var names = util.getArg(sourceMap, 'names');
+    var sourceRoot = util.getArg(sourceMap, 'sourceRoot', null);
+    var sourcesContent = util.getArg(sourceMap, 'sourcesContent', null);
+    var mappings = util.getArg(sourceMap, 'mappings');
+    var file = util.getArg(sourceMap, 'file', null);
+
+    if (version !== this._version) {
+      throw new Error('Unsupported version: ' + version);
+    }
+
+    // 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.
+    this._names = ArraySet.fromArray(names, true);
+    this._sources = ArraySet.fromArray(sources, true);
+    this.sourceRoot = sourceRoot;
+    this.sourcesContent = sourcesContent;
+    this.file = file;
+
+    // `this._generatedMappings` and `this._originalMappings` hold the parsed
+    // mapping coordinates from the source map's "mappings" attribute. Each
+    // object in the array 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`.
+    //
+    // `this._generatedMappings` is ordered by the generated positions.
+    //
+    // `this._originalMappings` is ordered by the original positions.
+    this._generatedMappings = [];
+    this._originalMappings = [];
+    this._parseMappings(mappings, sourceRoot);
+  }
+
+  /**
+   * Create a SourceMapConsumer from a SourceMapGenerator.
+   *
+   * @param SourceMapGenerator aSourceMap
+   *        The source map that will be consumed.
+   * @returns SourceMapConsumer
+   */
+  SourceMapConsumer.fromSourceMap =
+    function SourceMapConsumer_fromSourceMap(aSourceMap) {
+      var smc = Object.create(SourceMapConsumer.prototype);
+
+      smc._names = ArraySet.fromArray(aSourceMap._names.toArray(), true);
+      smc._sources = ArraySet.fromArray(aSourceMap._sources.toArray(), true);
+      smc.sourceRoot = aSourceMap._sourceRoot;
+      smc.sourcesContent = aSourceMap._generateSourcesContent(smc._sources.toArray(),
+                                                              smc.sourceRoot);
+      smc.file = aSourceMap._file;
+
+      smc._generatedMappings = aSourceMap._mappings.slice()
+        .sort(util.compareByGeneratedPositions);
+      smc._originalMappings = aSourceMap._mappings.slice()
+        .sort(util.compareByOriginalPositions);
+
+      return smc;
+    };
+
+  /**
+   * The version of the source mapping spec that we are consuming.
+   */
+  SourceMapConsumer.prototype._version = 3;
+
+  /**
+   * The list of original sources.
+   */
+  Object.defineProperty(SourceMapConsumer.prototype, 'sources', {
+    get: function () {
+      return this._sources.toArray().map(function (s) {
+        return this.sourceRoot ? util.join(this.sourceRoot, s) : s;
+      }, this);
+    }
+  });
+
+  /**
+   * Parse the mappings in a string in to a data structure which we can easily
+   * query (an ordered list in this._generatedMappings).
+   */
+  SourceMapConsumer.prototype._parseMappings =
+    function SourceMapConsumer_parseMappings(aStr, aSourceRoot) {
+      var generatedLine = 1;
+      var previousGeneratedColumn = 0;
+      var previousOriginalLine = 0;
+      var previousOriginalColumn = 0;
+      var previousSource = 0;
+      var previousName = 0;
+      var mappingSeparator = /^[,;]/;
+      var str = aStr;
+      var mapping;
+      var temp;
+
+      while (str.length > 0) {
+        if (str.charAt(0) === ';') {
+          generatedLine++;
+          str = str.slice(1);
+          previousGeneratedColumn = 0;
+        }
+        else if (str.charAt(0) === ',') {
+          str = str.slice(1);
+        }
+        else {
+          mapping = {};
+          mapping.generatedLine = generatedLine;
+
+          // Generated column.
+          temp = base64VLQ.decode(str);
+          mapping.generatedColumn = previousGeneratedColumn + temp.value;
+          previousGeneratedColumn = mapping.generatedColumn;
+          str = temp.rest;
+
+          if (str.length > 0 && !mappingSeparator.test(str.charAt(0))) {
+            // Original source.
+            temp = base64VLQ.decode(str);
+            mapping.source = this._sources.at(previousSource + temp.value);
+            previousSource += temp.value;
+            str = temp.rest;
+            if (str.length === 0 || mappingSeparator.test(str.charAt(0))) {
+              throw new Error('Found a source, but no line and column');
+            }
+
+            // Original line.
+            temp = base64VLQ.decode(str);
+            mapping.originalLine = previousOriginalLine + temp.value;
+            previousOriginalLine = mapping.originalLine;
+            // Lines are stored 0-based
+            mapping.originalLine += 1;
+            str = temp.rest;
+            if (str.length === 0 || mappingSeparator.test(str.charAt(0))) {
+              throw new Error('Found a source and line, but no column');
+            }
+
+            // Original column.
+            temp = base64VLQ.decode(str);
+            mapping.originalColumn = previousOriginalColumn + temp.value;
+            previousOriginalColumn = mapping.originalColumn;
+            str = temp.rest;
+
+            if (str.length > 0 && !mappingSeparator.test(str.charAt(0))) {
+              // Original name.
+              temp = base64VLQ.decode(str);
+              mapping.name = this._names.at(previousName + temp.value);
+              previousName += temp.value;
+              str = temp.rest;
+            }
+          }
+
+          this._generatedMappings.push(mapping);
+          if (typeof mapping.originalLine === 'number') {
+            this._originalMappings.push(mapping);
+          }
+        }
+      }
+
+      this._originalMappings.sort(util.compareByOriginalPositions);
+    };
+
+  /**
+   * Find the mapping that best matches the hypothetical "needle" mapping that
+   * we are searching for in the given "haystack" of mappings.
+   */
+  SourceMapConsumer.prototype._findMapping =
+    function SourceMapConsumer_findMapping(aNeedle, aMappings, aLineName,
+                                           aColumnName, aComparator) {
+      // 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);
+    };
+
+  /**
+   * 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.
+   *   - column: The column number in the generated source.
+   *
+   * 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.
+   *   - column: The column number in the original source, or null.
+   *   - name: The original identifier, or null.
+   */
+  SourceMapConsumer.prototype.originalPositionFor =
+    function SourceMapConsumer_originalPositionFor(aArgs) {
+      var needle = {
+        generatedLine: util.getArg(aArgs, 'line'),
+        generatedColumn: util.getArg(aArgs, 'column')
+      };
+
+      var mapping = this._findMapping(needle,
+                                      this._generatedMappings,
+                                      "generatedLine",
+                                      "generatedColumn",
+                                      util.compareByGeneratedPositions);
+
+      if (mapping) {
+        var source = util.getArg(mapping, 'source', null);
+        if (source && this.sourceRoot) {
+          source = util.join(this.sourceRoot, source);
+        }
+        return {
+          source: source,
+          line: util.getArg(mapping, 'originalLine', null),
+          column: util.getArg(mapping, 'originalColumn', null),
+          name: util.getArg(mapping, 'name', null)
+        };
+      }
+
+      return {
+        source: null,
+        line: null,
+        column: null,
+        name: 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
+   * availible.
+   */
+  SourceMapConsumer.prototype.sourceContentFor =
+    function SourceMapConsumer_sourceContentFor(aSource) {
+      if (!this.sourcesContent) {
+        return null;
+      }
+
+      if (this.sourceRoot) {
+        aSource = util.relative(this.sourceRoot, aSource);
+      }
+
+      if (this._sources.has(aSource)) {
+        return this.sourcesContent[this._sources.indexOf(aSource)];
+      }
+
+      var url;
+      if (this.sourceRoot
+          && (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.
+        var fileUriAbsPath = aSource.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("/" + aSource)) {
+          return this.sourcesContent[this._sources.indexOf("/" + aSource)];
+        }
+      }
+
+      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.
+   *   - column: The column number in the original source.
+   *
+   * and an object is returned with the following properties:
+   *
+   *   - line: The line number in the generated source, or null.
+   *   - column: The column number in the generated source, or null.
+   */
+  SourceMapConsumer.prototype.generatedPositionFor =
+    function SourceMapConsumer_generatedPositionFor(aArgs) {
+      var needle = {
+        source: util.getArg(aArgs, 'source'),
+        originalLine: util.getArg(aArgs, 'line'),
+        originalColumn: util.getArg(aArgs, 'column')
+      };
+
+      if (this.sourceRoot) {
+        needle.source = util.relative(this.sourceRoot, needle.source);
+      }
+
+      var mapping = this._findMapping(needle,
+                                      this._originalMappings,
+                                      "originalLine",
+                                      "originalColumn",
+                                      util.compareByOriginalPositions);
+
+      if (mapping) {
+        return {
+          line: util.getArg(mapping, 'generatedLine', null),
+          column: util.getArg(mapping, 'generatedColumn', null)
+        };
+      }
+
+      return {
+        line: null,
+        column: null
+      };
+    };
+
+  SourceMapConsumer.GENERATED_ORDER = 1;
+  SourceMapConsumer.ORIGINAL_ORDER = 2;
+
+  /**
+   * 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`.
+   */
+  SourceMapConsumer.prototype.eachMapping =
+    function SourceMapConsumer_eachMapping(aCallback, aContext, aOrder) {
+      var context = aContext || null;
+      var order = aOrder || SourceMapConsumer.GENERATED_ORDER;
+
+      var 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.");
+      }
+
+      var sourceRoot = this.sourceRoot;
+      mappings.map(function (mapping) {
+        var source = mapping.source;
+        if (source && sourceRoot) {
+          source = util.join(sourceRoot, source);
+        }
+        return {
+          source: source,
+          generatedLine: mapping.generatedLine,
+          generatedColumn: mapping.generatedColumn,
+          originalLine: mapping.originalLine,
+          originalColumn: mapping.originalColumn,
+          name: mapping.name
+        };
+      }).forEach(aCallback, context);
+    };
+
+  exports.SourceMapConsumer = SourceMapConsumer;
+
+});
+/* -*- 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
+ */
+define('source-map/binary-search', ['require', 'exports', 'module' , ], function(require, exports, module) {
+
+  /**
+   * 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.
+   */
+  function recursiveSearch(aLow, aHigh, aNeedle, aHaystack, aCompare) {
+    // 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 next
+    //      closest element that is less than that element.
+    //
+    //   3. We did not find the exact element, and there is no next-closest
+    //      element which is less than the one we are searching for, so we
+    //      return null.
+    var mid = Math.floor((aHigh - aLow) / 2) + aLow;
+    var cmp = aCompare(aNeedle, aHaystack[mid], true);
+    if (cmp === 0) {
+      // Found the element we are looking for.
+      return aHaystack[mid];
+    }
+    else if (cmp > 0) {
+      // aHaystack[mid] is greater than our needle.
+      if (aHigh - mid > 1) {
+        // The element is in the upper half.
+        return recursiveSearch(mid, aHigh, aNeedle, aHaystack, aCompare);
+      }
+      // We did not find an exact match, return the next closest one
+      // (termination case 2).
+      return aHaystack[mid];
+    }
+    else {
+      // aHaystack[mid] is less than our needle.
+      if (mid - aLow > 1) {
+        // The element is in the lower half.
+        return recursiveSearch(aLow, mid, aNeedle, aHaystack, aCompare);
+      }
+      // The exact needle element was not found in this haystack. Determine if
+      // we are in termination case (2) or (3) and return the appropriate thing.
+      return aLow < 0
+        ? null
+        : aHaystack[aLow];
+    }
+  }
+
+  /**
+   * This is an implementation of binary search which will always try and return
+   * the next lowest value checked 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.
+   */
+  exports.search = function search(aNeedle, aHaystack, aCompare) {
+    return aHaystack.length > 0
+      ? recursiveSearch(-1, aHaystack.length, aNeedle, aHaystack, aCompare)
+      : null;
+  };
+
+});
+/* -*- 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
+ */
+define('source-map/source-node', ['require', 'exports', 'module' ,  'source-map/source-map-generator', 'source-map/util'], function(require, exports, module) {
+
+  var SourceMapGenerator = require('./source-map-generator').SourceMapGenerator;
+  var util = require('./util');
+
+  /**
+   * 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.
+   */
+  function SourceNode(aLine, aColumn, aSource, aChunks, aName) {
+    this.children = [];
+    this.sourceContents = {};
+    this.line = aLine === undefined ? null : aLine;
+    this.column = aColumn === undefined ? null : aColumn;
+    this.source = aSource === undefined ? null : aSource;
+    this.name = aName === undefined ? null : aName;
+    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
+   */
+  SourceNode.fromStringWithSourceMap =
+    function SourceNode_fromStringWithSourceMap(aGeneratedCode, aSourceMapConsumer) {
+      // The SourceNode we want to fill with the generated code
+      // and the SourceMap
+      var node = new SourceNode();
+
+      // The generated code
+      // Processed fragments are removed from this array.
+      var remainingLines = aGeneratedCode.split('\n');
+
+      // We need to remember the position of "remainingLines"
+      var 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.
+      var lastMapping = null;
+
+      aSourceMapConsumer.eachMapping(function (mapping) {
+        if (lastMapping === null) {
+          // 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(remainingLines.shift() + "\n");
+            lastGeneratedLine++;
+          }
+          if (lastGeneratedColumn < mapping.generatedColumn) {
+            var nextLine = remainingLines[0];
+            node.add(nextLine.substr(0, mapping.generatedColumn));
+            remainingLines[0] = nextLine.substr(mapping.generatedColumn);
+            lastGeneratedColumn = mapping.generatedColumn;
+          }
+        } else {
+          // We add the code from "lastMapping" to "mapping":
+          // First check if there is a new line in between.
+          if (lastGeneratedLine < mapping.generatedLine) {
+            var code = "";
+            // Associate full lines with "lastMapping"
+            do {
+              code += remainingLines.shift() + "\n";
+              lastGeneratedLine++;
+              lastGeneratedColumn = 0;
+            } while (lastGeneratedLine < mapping.generatedLine);
+            // When we reached the correct line, we add code until we
+            // reach the correct column too.
+            if (lastGeneratedColumn < mapping.generatedColumn) {
+              var nextLine = remainingLines[0];
+              code += nextLine.substr(0, mapping.generatedColumn);
+              remainingLines[0] = nextLine.substr(mapping.generatedColumn);
+              lastGeneratedColumn = mapping.generatedColumn;
+            }
+            // Create the SourceNode.
+            addMappingWithCode(lastMapping, code);
+          } else {
+            // There is no new line in between.
+            // Associate the code between "lastGeneratedColumn" and
+            // "mapping.generatedColumn" with "lastMapping"
+            var nextLine = remainingLines[0];
+            var code = nextLine.substr(0, mapping.generatedColumn -
+                                          lastGeneratedColumn);
+            remainingLines[0] = nextLine.substr(mapping.generatedColumn -
+                                                lastGeneratedColumn);
+            lastGeneratedColumn = mapping.generatedColumn;
+            addMappingWithCode(lastMapping, code);
+          }
+        }
+        lastMapping = mapping;
+      }, this);
+      // We have processed all mappings.
+      // Associate the remaining code in the current line with "lastMapping"
+      // and add the remaining lines without any mapping
+      addMappingWithCode(lastMapping, remainingLines.join("\n"));
+
+      // Copy sourcesContent into SourceNode
+      aSourceMapConsumer.sources.forEach(function (sourceFile) {
+        var content = aSourceMapConsumer.sourceContentFor(sourceFile);
+        if (content) {
+          node.setSourceContent(sourceFile, content);
+        }
+      });
+
+      return node;
+
+      function addMappingWithCode(mapping, code) {
+        if (mapping === null || mapping.source === undefined) {
+          node.add(code);
+        } else {
+          node.add(new SourceNode(mapping.originalLine,
+                                  mapping.originalColumn,
+                                  mapping.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.
+   */
+  SourceNode.prototype.add = function SourceNode_add(aChunk) {
+    if (Array.isArray(aChunk)) {
+      aChunk.forEach(function (chunk) {
+        this.add(chunk);
+      }, this);
+    }
+    else if (aChunk instanceof SourceNode || 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.
+   */
+  SourceNode.prototype.prepend = function SourceNode_prepend(aChunk) {
+    if (Array.isArray(aChunk)) {
+      for (var i = aChunk.length-1; i >= 0; i--) {
+        this.prepend(aChunk[i]);
+      }
+    }
+    else if (aChunk instanceof SourceNode || 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.
+   */
+  SourceNode.prototype.walk = function SourceNode_walk(aFn) {
+    var chunk;
+    for (var i = 0, len = this.children.length; i < len; i++) {
+      chunk = this.children[i];
+      if (chunk instanceof SourceNode) {
+        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.
+   */
+  SourceNode.prototype.join = function SourceNode_join(aSep) {
+    var newChildren;
+    var i;
+    var 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.
+   */
+  SourceNode.prototype.replaceRight = function SourceNode_replaceRight(aPattern, aReplacement) {
+    var lastChild = this.children[this.children.length - 1];
+    if (lastChild instanceof SourceNode) {
+      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
+   */
+  SourceNode.prototype.setSourceContent =
+    function SourceNode_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.
+   */
+  SourceNode.prototype.walkSourceContents =
+    function SourceNode_walkSourceContents(aFn) {
+      for (var i = 0, len = this.children.length; i < len; i++) {
+        if (this.children[i] instanceof SourceNode) {
+          this.children[i].walkSourceContents(aFn);
+        }
+      }
+
+      var sources = Object.keys(this.sourceContents);
+      for (var 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.
+   */
+  SourceNode.prototype.toString = function SourceNode_toString() {
+    var str = "";
+    this.walk(function (chunk) {
+      str += chunk;
+    });
+    return str;
+  };
+
+  /**
+   * Returns the string representation of this source node along with a source
+   * map.
+   */
+  SourceNode.prototype.toStringWithSourceMap = function SourceNode_toStringWithSourceMap(aArgs) {
+    var generated = {
+      code: "",
+      line: 1,
+      column: 0
+    };
+    var map = new SourceMapGenerator(aArgs);
+    var sourceMappingActive = false;
+    var lastOriginalSource = null;
+    var lastOriginalLine = null;
+    var lastOriginalColumn = null;
+    var 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;
+      }
+      chunk.split('').forEach(function (ch) {
+        if (ch === '\n') {
+          generated.line++;
+          generated.column = 0;
+        } else {
+          generated.column++;
+        }
+      });
+    });
+    this.walkSourceContents(function (sourceFile, sourceContent) {
+      map.setSourceContent(sourceFile, sourceContent);
+    });
+
+    return { code: generated.code, map: map };
+  };
+
+  exports.SourceNode = SourceNode;
+
+});
+/* -*- Mode: js; js-indent-level: 2; -*- */
+///////////////////////////////////////////////////////////////////////////////
+
+window.sourceMap = {
+  SourceMapConsumer: require('source-map/source-map-consumer').SourceMapConsumer,
+  SourceMapGenerator: require('source-map/source-map-generator').SourceMapGenerator,
+  SourceNode: require('source-map/source-node').SourceNode
+};
+// Generated by CommonJS Everywhere 0.8.1
+(function (global) {
+  function require(file, parentModule) {
+    if ({}.hasOwnProperty.call(require.cache, file))
+      return require.cache[file];
+    var resolved = require.resolve(file);
+    if (!resolved)
+      throw new Error('Failed to resolve module ' + file);
+    var module$ = {
+        id: file,
+        require: require,
+        filename: file,
+        exports: {},
+        loaded: false,
+        parent: parentModule,
+        children: []
+      };
+    if (parentModule)
+      parentModule.children.push(module$);
+    var dirname = file.slice(0, file.lastIndexOf('/') + 1);
+    require.cache[file] = module$.exports;
+    resolved.call(module$.exports, module$, module$.exports, dirname, file);
+    module$.loaded = true;
+    return require.cache[file] = module$.exports;
+  }
+  require.modules = {};
+  require.cache = {};
+  require.resolve = function (file) {
+    return {}.hasOwnProperty.call(require.modules, file) ? require.modules[file] : void 0;
+  };
+  require.define = function (file, fn) {
+    require.modules[file] = fn;
+  };
+  var process = function () {
+      var cwd = '/';
+      return {
+        title: 'browser',
+        version: 'v0.10.5',
+        browser: true,
+        env: {},
+        argv: [],
+        nextTick: global.setImmediate || function (fn) {
+          setTimeout(fn, 0);
+        },
+        cwd: function () {
+          return cwd;
+        },
+        chdir: function (dir) {
+          cwd = dir;
+        }
+      };
+    }();
+  require.define('/tools/entry-point.js', function (module, exports, __dirname, __filename) {
+    (function () {
+      'use strict';
+      global.escodegen = require('/escodegen.js', module);
+      escodegen.browser = true;
+    }());
+  });
+  require.define('/escodegen.js', function (module, exports, __dirname, __filename) {
+    (function () {
+      'use strict';
+      var Syntax, Precedence, BinaryPrecedence, Regex, SourceNode, estraverse, isArray, base, indent, json, renumber, hexadecimal, quotes, escapeless, newline, space, parentheses, semicolons, safeConcatenation, directive, extra, parse, sourceMap, FORMAT_MINIFY, FORMAT_DEFAULTS;
+      estraverse = require('/node_modules/estraverse/estraverse.js', module);
+      Syntax = {
+        AssignmentExpression: 'AssignmentExpression',
+        ArrayExpression: 'ArrayExpression',
+        ArrayPattern: 'ArrayPattern',
+        ArrowFunctionExpression: 'ArrowFunctionExpression',
+        BlockStatement: 'BlockStatement',
+        BinaryExpression: 'BinaryExpression',
+        BreakStatement: 'BreakStatement',
+        CallExpression: 'CallExpression',
+        CatchClause: 'CatchClause',
+        ComprehensionBlock: 'ComprehensionBlock',
+        ComprehensionExpression: 'ComprehensionExpression',
+        ConditionalExpression: 'ConditionalExpression',
+        ContinueStatement: 'ContinueStatement',
+        DirectiveStatement: 'DirectiveStatement',
+        DoWhileStatement: 'DoWhileStatement',
+        DebuggerStatement: 'DebuggerStatement',
+        EmptyStatement: 'EmptyStatement',
+        ExpressionStatement: 'ExpressionStatement',
+        ForStatement: 'ForStatement',
+        ForInStatement: 'ForInStatement',
+        FunctionDeclaration: 'FunctionDeclaration',
+        FunctionExpression: 'FunctionExpression',
+        Identifier: 'Identifier',
+        IfStatement: 'IfStatement',
+        Literal: 'Literal',
+        LabeledStatement: 'LabeledStatement',
+        LogicalExpression: 'LogicalExpression',
+        MemberExpression: 'MemberExpression',
+        NewExpression: 'NewExpression',
+        ObjectExpression: 'ObjectExpression',
+        ObjectPattern: 'ObjectPattern',
+        Program: 'Program',
+        Property: 'Property',
+        ReturnStatement: 'ReturnStatement',
+        SequenceExpression: 'SequenceExpression',
+        SwitchStatement: 'SwitchStatement',
+        SwitchCase: 'SwitchCase',
+        ThisExpression: 'ThisExpression',
+        ThrowStatement: 'ThrowStatement',
+        TryStatement: 'TryStatement',
+        UnaryExpression: 'UnaryExpression',
+        UpdateExpression: 'UpdateExpression',
+        VariableDeclaration: 'VariableDeclaration',
+        VariableDeclarator: 'VariableDeclarator',
+        WhileStatement: 'WhileStatement',
+        WithStatement: 'WithStatement',
+        YieldExpression: 'YieldExpression'
+      };
+      Precedence = {
+        Sequence: 0,
+        Assignment: 1,
+        Conditional: 2,
+        ArrowFunction: 2,
+        LogicalOR: 3,
+        LogicalAND: 4,
+        BitwiseOR: 5,
+        BitwiseXOR: 6,
+        BitwiseAND: 7,
+        Equality: 8,
+        Relational: 9,
+        BitwiseSHIFT: 10,
+        Additive: 11,
+        Multiplicative: 12,
+        Unary: 13,
+        Postfix: 14,
+        Call: 15,
+        New: 16,
+        Member: 17,
+        Primary: 18
+      };
+      BinaryPrecedence = {
+        '||': Precedence.LogicalOR,
+        '&&': Precedence.LogicalAND,
+        '|': Precedence.BitwiseOR,
+        '^': Precedence.BitwiseXOR,
+        '&': Precedence.BitwiseAND,
+        '==': Precedence.Equality,
+        '!=': Precedence.Equality,
+        '===': Precedence.Equality,
+        '!==': Precedence.Equality,
+        'is': Precedence.Equality,
+        'isnt': Precedence.Equality,
+        '<': Precedence.Relational,
+        '>': Precedence.Relational,
+        '<=': Precedence.Relational,
+        '>=': Precedence.Relational,
+        'in': Precedence.Relational,
+        'instanceof': Precedence.Relational,
+        '<<': Precedence.BitwiseSHIFT,
+        '>>': Precedence.BitwiseSHIFT,
+        '>>>': Precedence.BitwiseSHIFT,
+        '+': Precedence.Additive,
+        '-': Precedence.Additive,
+        '*': Precedence.Multiplicative,
+        '%': Precedence.Multiplicative,
+        '/': Precedence.Multiplicative
+      };
+      Regex = { NonAsciiIdentifierPart: new RegExp('[\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0300-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u0483-\u0487\u048a-\u0527\u0531-\u0556\u0559\u0561-\u0587\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u05d0-\u05ea\u05f0-\u05f2\u0610-\u061a\u0620-\u0669\u066e-\u06d3\u06d5-\u06dc\u06df-\u06e8\u06ea-\u06fc\u06ff\u0710-\u074a\u074d-\u07b1\u07c0-\u07f5\u07fa\u0800-\u082d\u0840-\u085b\u08a0\u08a2-\u08ac\u08e4-\u08fe\u0900-\u0963\u0966-\u096f\u0971-\u0977\u0979-\u097f\u0981-\u0983\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bc-\u09c4\u09c7\u09c8\u09cb-\u09ce\u09d7\u09dc\u09dd\u09df-\u09e3\u09e6-\u09f1\u0a01-\u0a03\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a3c\u0a3e-\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a59-\u0a5c\u0a5e\u0a66-\u0a75\u0a81-\u0a83\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abc-\u0ac5\u0ac7-\u0ac9\u0acb-\u0acd\u0ad0\u0ae0-\u0ae3\u0ae6-\u0aef\u0b01-\u0b03\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3c-\u0b44\u0b47\u0b48\u0b4b-\u0b4d\u0b56\u0b57\u0b5c\u0b5d\u0b5f-\u0b63\u0b66-\u0b6f\u0b71\u0b82\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bbe-\u0bc2\u0bc6-\u0bc8\u0bca-\u0bcd\u0bd0\u0bd7\u0be6-\u0bef\u0c01-\u0c03\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d-\u0c44\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c58\u0c59\u0c60-\u0c63\u0c66-\u0c6f\u0c82\u0c83\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbc-\u0cc4\u0cc6-\u0cc8\u0cca-\u0ccd\u0cd5\u0cd6\u0cde\u0ce0-\u0ce3\u0ce6-\u0cef\u0cf1\u0cf2\u0d02\u0d03\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d-\u0d44\u0d46-\u0d48\u0d4a-\u0d4e\u0d57\u0d60-\u0d63\u0d66-\u0d6f\u0d7a-\u0d7f\u0d82\u0d83\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0dca\u0dcf-\u0dd4\u0dd6\u0dd8-\u0ddf\u0df2\u0df3\u0e01-\u0e3a\u0e40-\u0e4e\u0e50-\u0e59\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb9\u0ebb-\u0ebd\u0ec0-\u0ec4\u0ec6\u0ec8-\u0ecd\u0ed0-\u0ed9\u0edc-\u0edf\u0f00\u0f18\u0f19\u0f20-\u0f29\u0f35\u0f37\u0f39\u0f3e-\u0f47\u0f49-\u0f6c\u0f71-\u0f84\u0f86-\u0f97\u0f99-\u0fbc\u0fc6\u1000-\u1049\u1050-\u109d\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u135d-\u135f\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1714\u1720-\u1734\u1740-\u1753\u1760-\u176c\u176e-\u1770\u1772\u1773\u1780-\u17d3\u17d7\u17dc\u17dd\u17e0-\u17e9\u180b-\u180d\u1810-\u1819\u1820-\u1877\u1880-\u18aa\u18b0-\u18f5\u1900-\u191c\u1920-\u192b\u1930-\u193b\u1946-\u196d\u1970-\u1974\u1980-\u19ab\u19b0-\u19c9\u19d0-\u19d9\u1a00-\u1a1b\u1a20-\u1a5e\u1a60-\u1a7c\u1a7f-\u1a89\u1a90-\u1a99\u1aa7\u1b00-\u1b4b\u1b50-\u1b59\u1b6b-\u1b73\u1b80-\u1bf3\u1c00-\u1c37\u1c40-\u1c49\u1c4d-\u1c7d\u1cd0-\u1cd2\u1cd4-\u1cf6\u1d00-\u1de6\u1dfc-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u200c\u200d\u203f\u2040\u2054\u2071\u207f\u2090-\u209c\u20d0-\u20dc\u20e1\u20e5-\u20f0\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d7f-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2de0-\u2dff\u2e2f\u3005-\u3007\u3021-\u302f\u3031-\u3035\u3038-\u303c\u3041-\u3096\u3099\u309a\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua62b\ua640-\ua66f\ua674-\ua67d\ua67f-\ua697\ua69f-\ua6f1\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua827\ua840-\ua873\ua880-\ua8c4\ua8d0-\ua8d9\ua8e0-\ua8f7\ua8fb\ua900-\ua92d\ua930-\ua953\ua960-\ua97c\ua980-\ua9c0\ua9cf-\ua9d9\uaa00-\uaa36\uaa40-\uaa4d\uaa50-\uaa59\uaa60-\uaa76\uaa7a\uaa7b\uaa80-\uaac2\uaadb-\uaadd\uaae0-\uaaef\uaaf2-\uaaf6\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\uabea\uabec\uabed\uabf0-\uabf9\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe00-\ufe0f\ufe20-\ufe26\ufe33\ufe34\ufe4d-\ufe4f\ufe70-\ufe74\ufe76-\ufefc\uff10-\uff19\uff21-\uff3a\uff3f\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]') };
+      function getDefaultOptions() {
+        return {
+          indent: null,
+          base: null,
+          parse: null,
+          comment: false,
+          format: {
+            indent: {
+              style: '    ',
+              base: 0,
+              adjustMultilineComment: false
+            },
+            newline: '\n',
+            space: ' ',
+            json: false,
+            renumber: false,
+            hexadecimal: false,
+            quotes: 'single',
+            escapeless: false,
+            compact: false,
+            parentheses: true,
+            semicolons: true,
+            safeConcatenation: false
+          },
+          moz: {
+            starlessGenerator: false,
+            parenthesizedComprehensionBlock: false
+          },
+          sourceMap: null,
+          sourceMapRoot: null,
+          sourceMapWithCode: false,
+          directive: false,
+          verbatim: null
+        };
+      }
+      function stringToArray(str) {
+        var length = str.length, result = [], i;
+        for (i = 0; i < length; i += 1) {
+          result[i] = str.charAt(i);
+        }
+        return result;
+      }
+      function stringRepeat(str, num) {
+        var result = '';
+        for (num |= 0; num > 0; num >>>= 1, str += str) {
+          if (num & 1) {
+            result += str;
+          }
+        }
+        return result;
+      }
+      isArray = Array.isArray;
+      if (!isArray) {
+        isArray = function isArray(array) {
+          return Object.prototype.toString.call(array) === '[object Array]';
+        };
+      }
+      function SourceNodeMock(line, column, filename, chunk) {
+        var result = [];
+        function flatten(input) {
+          var i, iz;
+          if (isArray(input)) {
+            for (i = 0, iz = input.length; i < iz; ++i) {
+              flatten(input[i]);
+            }
+          } else if (input instanceof SourceNodeMock) {
+            result.push(input);
+          } else if (typeof input === 'string' && input) {
+            result.push(input);
+          }
+        }
+        flatten(chunk);
+        this.children = result;
+      }
+      SourceNodeMock.prototype.toString = function toString() {
+        var res = '', i, iz, node;
+        for (i = 0, iz = this.children.length; i < iz; ++i) {
+          node = this.children[i];
+          if (node instanceof SourceNodeMock) {
+            res += node.toString();
+          } else {
+            res += node;
+          }
+        }
+        return res;
+      };
+      SourceNodeMock.prototype.replaceRight = function replaceRight(pattern, replacement) {
+        var last = this.children[this.children.length - 1];
+        if (last instanceof SourceNodeMock) {
+          last.replaceRight(pattern, replacement);
+        } else if (typeof last === 'string') {
+          this.children[this.children.length - 1] = last.replace(pattern, replacement);
+        } else {
+          this.children.push(''.replace(pattern, replacement));
+        }
+        return this;
+      };
+      SourceNodeMock.prototype.join = function join(sep) {
+        var i, iz, result;
+        result = [];
+        iz = this.children.length;
+        if (iz > 0) {
+          for (i = 0, iz -= 1; i < iz; ++i) {
+            result.push(this.children[i], sep);
+          }
+          result.push(this.children[iz]);
+          this.children = result;
+        }
+        return this;
+      };
+      function hasLineTerminator(str) {
+        return /[\r\n]/g.test(str);
+      }
+      function endsWithLineTerminator(str) {
+        var ch = str.charAt(str.length - 1);
+        return ch === '\r' || ch === '\n';
+      }
+      function updateDeeply(target, override) {
+        var key, val;
+        function isHashObject(target) {
+          return typeof target === 'object' && target instanceof Object && !(target instanceof RegExp);
+        }
+        for (key in override) {
+          if (override.hasOwnProperty(key)) {
+            val = override[key];
+            if (isHashObject(val)) {
+              if (isHashObject(target[key])) {
+                updateDeeply(target[key], val);
+              } else {
+                target[key] = updateDeeply({}, val);
+              }
+            } else {
+              target[key] = val;
+            }
+          }
+        }
+        return target;
+      }
+      function generateNumber(value) {
+        var result, point, temp, exponent, pos;
+        if (value !== value) {
+          throw new Error('Numeric literal whose value is NaN');
+        }
+        if (value < 0 || value === 0 && 1 / value < 0) {
+          throw new Error('Numeric literal whose value is negative');
+        }
+        if (value === 1 / 0) {
+          return json ? 'null' : renumber ? '1e400' : '1e+400';
+        }
+        result = '' + value;
+        if (!renumber || result.length < 3) {
+          return result;
+        }
+        point = result.indexOf('.');
+        if (!json && result.charAt(0) === '0' && point === 1) {
+          point = 0;
+          result = result.slice(1);
+        }
+        temp = result;
+        result = result.replace('e+', 'e');
+        exponent = 0;
+        if ((pos = temp.indexOf('e')) > 0) {
+          exponent = +temp.slice(pos + 1);
+          temp = temp.slice(0, pos);
+        }
+        if (point >= 0) {
+          exponent -= temp.length - point - 1;
+          temp = +(temp.slice(0, point) + temp.slice(point + 1)) + '';
+        }
+        pos = 0;
+        while (temp.charAt(temp.length + pos - 1) === '0') {
+          pos -= 1;
+        }
+        if (pos !== 0) {
+          exponent -= pos;
+          temp = temp.slice(0, pos);
+        }
+        if (exponent !== 0) {
+          temp += 'e' + exponent;
+        }
+        if ((temp.length < result.length || hexadecimal && value > 1e12 && Math.floor(value) === value && (temp = '0x' + value.toString(16)).length < result.length) && +temp === value) {
+          result = temp;
+        }
+        return result;
+      }
+      function escapeRegExpCharacter(ch, previousIsBackslash) {
+        if ((ch & ~1) === 8232) {
+          return (previousIsBackslash ? 'u' : '\\u') + (ch === 8232 ? '2028' : '2029');
+        } else if (ch === 10 || ch === 13) {
+          return (previousIsBackslash ? '' : '\\') + (ch === 10 ? 'n' : 'r');
+        }
+        return String.fromCharCode(ch);
+      }
+      function generateRegExp(reg) {
+        var match, result, flags, i, iz, ch, characterInBrack, previousIsBackslash;
+        result = reg.toString();
+        if (reg.source) {
+          match = result.match(/\/([^/]*)$/);
+          if (!match) {
+            return result;
+          }
+          flags = match[1];
+          result = '';
+          characterInBrack = false;
+          previousIsBackslash = false;
+          for (i = 0, iz = reg.source.length; i < iz; ++i) {
+            ch = reg.source.charCodeAt(i);
+            if (!previousIsBackslash) {
+              if (characterInBrack) {
+                if (ch === 93) {
+                  characterInBrack = false;
+                }
+              } else {
+                if (ch === 47) {
+                  result += '\\';
+                } else if (ch === 91) {
+                  characterInBrack = true;
+                }
+              }
+              result += escapeRegExpCharacter(ch, previousIsBackslash);
+              previousIsBackslash = ch === 92;
+            } else {
+              result += escapeRegExpCharacter(ch, previousIsBackslash);
+              previousIsBackslash = false;
+            }
+          }
+          return '/' + result + '/' + flags;
+        }
+        return result;
+      }
+      function escapeAllowedCharacter(ch, next) {
+        var code = ch.charCodeAt(0), hex = code.toString(16), result = '\\';
+        switch (ch) {
+        case '\b':
+          result += 'b';
+          break;
+        case '\f':
+          result += 'f';
+          break;
+        case '\t':
+          result += 't';
+          break;
+        default:
+          if (json || code > 255) {
+            result += 'u' + '0000'.slice(hex.length) + hex;
+          } else if (ch === '\0' && '0123456789'.indexOf(next) < 0) {
+            result += '0';
+          } else if (ch === '\x0B') {
+            result += 'x0B';
+          } else {
+            result += 'x' + '00'.slice(hex.length) + hex;
+          }
+          break;
+        }
+        return result;
+      }
+      function escapeDisallowedCharacter(ch) {
+        var result = '\\';
+        switch (ch) {
+        case '\\':
+          result += '\\';
+          break;
+        case '\n':
+          result += 'n';
+          break;
+        case '\r':
+          result += 'r';
+          break;
+        case '\u2028':
+          result += 'u2028';
+          break;
+        case '\u2029':
+          result += 'u2029';
+          break;
+        default:
+          throw new Error('Incorrectly classified character');
+        }
+        return result;
+      }
+      function escapeDirective(str) {
+        var i, iz, ch, buf, quote;
+        buf = str;
+        if (typeof buf[0] === 'undefined') {
+          buf = stringToArray(buf);
+        }
+        quote = quotes === 'double' ? '"' : "'";
+        for (i = 0, iz = buf.length; i < iz; i += 1) {
+          ch = buf[i];
+          if (ch === "'") {
+            quote = '"';
+            break;
+          } else if (ch === '"') {
+            quote = "'";
+            break;
+          } else if (ch === '\\') {
+            i += 1;
+          }
+        }
+        return quote + str + quote;
+      }
+      function escapeString(str) {
+        var result = '', i, len, ch, singleQuotes = 0, doubleQuotes = 0, single;
+        if (typeof str[0] === 'undefined') {
+          str = stringToArray(str);
+        }
+        for (i = 0, len = str.length; i < len; i += 1) {
+          ch = str[i];
+          if (ch === "'") {
+            singleQuotes += 1;
+          } else if (ch === '"') {
+            doubleQuotes += 1;
+          } else if (ch === '/' && json) {
+            result += '\\';
+          } else if ('\\\n\r\u2028\u2029'.indexOf(ch) >= 0) {
+            result += escapeDisallowedCharacter(ch);
+            continue;
+          } else if (json && ch < ' ' || !(json || escapeless || ch >= ' ' && ch <= '~')) {
+            result += escapeAllowedCharacter(ch, str[i + 1]);
+            continue;
+          }
+          result += ch;
+        }
+        single = !(quotes === 'double' || quotes === 'auto' && doubleQuotes < singleQuotes);
+        str = result;
+        result = single ? "'" : '"';
+        if (typeof str[0] === 'undefined') {
+          str = stringToArray(str);
+        }
+        for (i = 0, len = str.length; i < len; i += 1) {
+          ch = str[i];
+          if (ch === "'" && single || ch === '"' && !single) {
+            result += '\\';
+          }
+          result += ch;
+        }
+        return result + (single ? "'" : '"');
+      }
+      function isWhiteSpace(ch) {
+        return '\t\x0B\f \xa0'.indexOf(ch) >= 0 || ch.charCodeAt(0) >= 5760 && '\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\ufeff'.indexOf(ch) >= 0;
+      }
+      function isLineTerminator(ch) {
+        return '\n\r\u2028\u2029'.indexOf(ch) >= 0;
+      }
+      function isIdentifierPart(ch) {
+        return ch === '$' || ch === '_' || ch === '\\' || ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z' || ch >= '0' && ch <= '9' || ch.charCodeAt(0) >= 128 && Regex.NonAsciiIdentifierPart.test(ch);
+      }
+      function isDecimalDigit(ch) {
+        return ch >= 48 && ch <= 57;
+      }
+      function toSourceNode(generated, node) {
+        if (node == null) {
+          if (generated instanceof SourceNode) {
+            return generated;
+          } else {
+            node = {};
+          }
+        }
+        if (node.loc == null) {
+          return new SourceNode(null, null, sourceMap, generated, node.name || null);
+        }
+        return new SourceNode(node.loc.start.line, node.loc.start.column, sourceMap === true ? node.loc.source || null : sourceMap, generated, node.name || null);
+      }
+      function noEmptySpace() {
+        return space ? space : ' ';
+      }
+      function join(left, right) {
+        var leftSource = toSourceNode(left).toString(), rightSource = toSourceNode(right).toString(), leftChar = leftSource.charAt(leftSource.length - 1), rightChar = rightSource.charAt(0);
+        if ((leftChar === '+' || leftChar === '-') && leftChar === rightChar || isIdentifierPart(leftChar) && isIdentifierPart(rightChar) || leftChar === '/' && rightChar === 'i') {
+          return [
+            left,
+            noEmptySpace(),
+            right
+          ];
+        } else if (isWhiteSpace(leftChar) || isLineTerminator(leftChar) || isWhiteSpace(rightChar) || isLineTerminator(rightChar)) {
+          return [
+            left,
+            right
+          ];
+        }
+        return [
+          left,
+          space,
+          right
+        ];
+      }
+      function addIndent(stmt) {
+        return [
+          base,
+          stmt
+        ];
+      }
+      function withIndent(fn) {
+        var previousBase, result;
+        previousBase = base;
+        base += indent;
+        result = fn.call(this, base);
+        base = previousBase;
+        return result;
+      }
+      function calculateSpaces(str) {
+        var i;
+        for (i = str.length - 1; i >= 0; i -= 1) {
+          if (isLineTerminator(str.charAt(i))) {
+            break;
+          }
+        }
+        return str.length - 1 - i;
+      }
+      function adjustMultilineComment(value, specialBase) {
+        var array, i, len, line, j, spaces, previousBase;
+        array = value.split(/\r\n|[\r\n]/);
+        spaces = Number.MAX_VALUE;
+        for (i = 1, len = array.length; i < len; i += 1) {
+          line = array[i];
+          j = 0;
+          while (j < line.length && isWhiteSpace(line[j])) {
+            j += 1;
+          }
+          if (spaces > j) {
+            spaces = j;
+          }
+        }
+        if (typeof specialBase !== 'undefined') {
+          previousBase = base;
+          if (array[1][spaces] === '*') {
+            specialBase += ' ';
+          }
+          base = specialBase;
+        } else {
+          if (spaces & 1) {
+            spaces -= 1;
+          }
+          previousBase = base;
+        }
+        for (i = 1, len = array.length; i < len; i += 1) {
+          array[i] = toSourceNode(addIndent(array[i].slice(spaces))).join('');
+        }
+        base = previousBase;
+        return array.join('\n');
+      }
+      function generateComment(comment, specialBase) {
+        if (comment.type === 'Line') {
+          if (endsWithLineTerminator(comment.value)) {
+            return '//' + comment.value;
+          } else {
+            return '//' + comment.value + '\n';
+          }
+        }
+        if (extra.format.indent.adjustMultilineComment && /[\n\r]/.test(comment.value)) {
+          return adjustMultilineComment('/*' + comment.value + '*/', specialBase);
+        }
+        return '/*' + comment.value + '*/';
+      }
+      function addCommentsToStatement(stmt, result) {
+        var i, len, comment, save, tailingToStatement, specialBase, fragment;
+        if (stmt.leadingComments && stmt.leadingComments.length > 0) {
+          save = result;
+          comment = stmt.leadingComments[0];
+          result = [];
+          if (safeConcatenation && stmt.type === Syntax.Program && stmt.body.length === 0) {
+            result.push('\n');
+          }
+          result.push(generateComment(comment));
+          if (!endsWithLineTerminator(toSourceNode(result).toString())) {
+            result.push('\n');
+          }
+          for (i = 1, len = stmt.leadingComments.length; i < len; i += 1) {
+            comment = stmt.leadingComments[i];
+            fragment = [generateComment(comment)];
+            if (!endsWithLineTerminator(toSourceNode(fragment).toString())) {
+              fragment.push('\n');
+            }
+            result.push(addIndent(fragment));
+          }
+          result.push(addIndent(save));
+        }
+        if (stmt.trailingComments) {
+          tailingToStatement = !endsWithLineTerminator(toSourceNode(result).toString());
+          specialBase = stringRepeat(' ', calculateSpaces(toSourceNode([
+            base,
+            result,
+            indent
+          ]).toString()));
+          for (i = 0, len = stmt.trailingComments.length; i < len; i += 1) {
+            comment = stmt.trailingComments[i];
+            if (tailingToStatement) {
+              if (i === 0) {
+                result = [
+                  result,
+                  indent
+                ];
+              } else {
+                result = [
+                  result,
+                  specialBase
+                ];
+              }
+              result.push(generateComment(comment, specialBase));
+            } else {
+              result = [
+                result,
+                addIndent(generateComment(comment))
+              ];
+            }
+            if (i !== len - 1 && !endsWithLineTerminator(toSourceNode(result).toString())) {
+              result = [
+                result,
+                '\n'
+              ];
+            }
+          }
+        }
+        return result;
+      }
+      function parenthesize(text, current, should) {
+        if (current < should) {
+          return [
+            '(',
+            text,
+            ')'
+          ];
+        }
+        return text;
+      }
+      function maybeBlock(stmt, semicolonOptional, functionBody) {
+        var result, noLeadingComment;
+        noLeadingComment = !extra.comment || !stmt.leadingComments;
+        if (stmt.type === Syntax.BlockStatement && noLeadingComment) {
+          return [
+            space,
+            generateStatement(stmt, { functionBody: functionBody })
+          ];
+        }
+        if (stmt.type === Syntax.EmptyStatement && noLeadingComment) {
+          return ';';
+        }
+        withIndent(function () {
+          result = [
+            newline,
+            addIndent(generateStatement(stmt, {
+              semicolonOptional: semicolonOptional,
+              functionBody: functionBody
+            }))
+          ];
+        });
+        return result;
+      }
+      function maybeBlockSuffix(stmt, result) {
+        var ends = endsWithLineTerminator(toSourceNode(result).toString());
+        if (stmt.type === Syntax.BlockStatement && (!extra.comment || !stmt.leadingComments) && !ends) {
+          return [
+            result,
+            space
+          ];
+        }
+        if (ends) {
+          return [
+            result,
+            base
+          ];
+        }
+        return [
+          result,
+          newline,
+          base
+        ];
+      }
+      function generateVerbatim(expr, option) {
+        var i, result;
+        result = expr[extra.verbatim].split(/\r\n|\n/);
+        for (i = 1; i < result.length; i++) {
+          result[i] = newline + base + result[i];
+        }
+        result = parenthesize(result, Precedence.Sequence, option.precedence);
+        return toSourceNode(result, expr);
+      }
+      function generateIdentifier(node) {
+        return toSourceNode(node.name, node);
+      }
+      function generateFunctionBody(node) {
+        var result, i, len, expr, arrow;
+        arrow = node.type === Syntax.ArrowFunctionExpression;
+        if (arrow && node.params.length === 1 && node.params[0].type === Syntax.Identifier) {
+          result = [generateIdentifier(node.params[0])];
+        } else {
+          result = ['('];
+          for (i = 0, len = node.params.length; i < len; i += 1) {
+            result.push(generateIdentifier(node.params[i]));
+            if (i + 1 < len) {
+              result.push(',' + space);
+            }
+          }
+          result.push(')');
+        }
+        if (arrow) {
+          result.push(space, '=>');
+        }
+        if (node.expression) {
+          result.push(space);
+          expr = generateExpression(node.body, {
+            precedence: Precedence.Assignment,
+            allowIn: true,
+            allowCall: true
+          });
+          if (expr.toString().charAt(0) === '{') {
+            expr = [
+              '(',
+              expr,
+              ')'
+            ];
+          }
+          result.push(expr);
+        } else {
+          result.push(maybeBlock(node.body, false, true));
+        }
+        return result;
+      }
+      function generateExpression(expr, option) {
+        var result, precedence, type, currentPrecedence, i, len, raw, fragment, multiline, leftChar, leftSource, rightChar, allowIn, allowCall, allowUnparenthesizedNew, property;
+        precedence = option.precedence;
+        allowIn = option.allowIn;
+        allowCall = option.allowCall;
+        type = expr.type || option.type;
+        if (extra.verbatim && expr.hasOwnProperty(extra.verbatim)) {
+          return generateVerbatim(expr, option);
+        }
+        switch (type) {
+        case Syntax.SequenceExpression:
+          result = [];
+          allowIn |= Precedence.Sequence < precedence;
+          for (i = 0, len = expr.expressions.length; i < len; i += 1) {
+            result.push(generateExpression(expr.expressions[i], {
+              precedence: Precedence.Assignment,
+              allowIn: allowIn,
+              allowCall: true
+            }));
+            if (i + 1 < len) {
+              result.push(',' + space);
+            }
+          }
+          result = parenthesize(result, Precedence.Sequence, precedence);
+          break;
+        case Syntax.AssignmentExpression:
+          allowIn |= Precedence.Assignment < precedence;
+          result = parenthesize([
+            generateExpression(expr.left, {
+              precedence: Precedence.Call,
+              allowIn: allowIn,
+              allowCall: true
+            }),
+            space + expr.operator + space,
+            generateExpression(expr.right, {
+              precedence: Precedence.Assignment,
+              allowIn: allowIn,
+              allowCall: true
+            })
+          ], Precedence.Assignment, precedence);
+          break;
+        case Syntax.ArrowFunctionExpression:
+          allowIn |= Precedence.ArrowFunction < precedence;
+          result = parenthesize(generateFunctionBody(expr), Precedence.ArrowFunction, precedence);
+          break;
+        case Syntax.ConditionalExpression:
+          allowIn |= Precedence.Conditional < precedence;
+          result = parenthesize([
+            generateExpression(expr.test, {
+              precedence: Precedence.LogicalOR,
+              allowIn: allowIn,
+              allowCall: true
+            }),
+            space + '?' + space,
+            generateExpression(expr.consequent, {
+              precedence: Precedence.Assignment,
+              allowIn: allowIn,
+              allowCall: true
+            }),
+            space + ':' + space,
+            generateExpression(expr.alternate, {
+              precedence: Precedence.Assignment,
+              allowIn: allowIn,
+              allowCall: true
+            })
+          ], Precedence.Conditional, precedence);
+          break;
+        case Syntax.LogicalExpression:
+        case Syntax.BinaryExpression:
+          currentPrecedence = BinaryPrecedence[expr.operator];
+          allowIn |= currentPrecedence < precedence;
+          fragment = generateExpression(expr.left, {
+            precedence: currentPrecedence,
+            allowIn: allowIn,
+            allowCall: true
+          });
+          leftSource = fragment.toString();
+          if (leftSource.charAt(leftSource.length - 1) === '/' && isIdentifierPart(expr.operator.charAt(0))) {
+            result = [
+              fragment,
+              noEmptySpace(),
+              expr.operator
+            ];
+          } else {
+            result = join(fragment, expr.operator);
+          }
+          fragment = generateExpression(expr.right, {
+            precedence: currentPrecedence + 1,
+            allowIn: allowIn,
+            allowCall: true
+          });
+          if (expr.operator === '/' && fragment.toString().charAt(0) === '/' || expr.operator.slice(-1) === '<' && fragment.toString().slice(0, 3) === '!--') {
+            result.push(noEmptySpace(), fragment);
+          } else {
+            result = join(result, fragment);
+          }
+          if (expr.operator === 'in' && !allowIn) {
+            result = [
+              '(',
+              result,
+              ')'
+            ];
+          } else {
+            result = parenthesize(result, currentPrecedence, precedence);
+          }
+          break;
+        case Syntax.CallExpression:
+          result = [generateExpression(expr.callee, {
+              precedence: Precedence.Call,
+              allowIn: true,
+              allowCall: true,
+              allowUnparenthesizedNew: false
+            })];
+          result.push('(');
+          for (i = 0, len = expr['arguments'].length; i < len; i += 1) {
+            result.push(generateExpression(expr['arguments'][i], {
+              precedence: Precedence.Assignment,
+              allowIn: true,
+              allowCall: true
+            }));
+            if (i + 1 < len) {
+              result.push(',' + space);
+            }
+          }
+          result.push(')');
+          if (!allowCall) {
+            result = [
+              '(',
+              result,
+              ')'
+            ];
+          } else {
+            result = parenthesize(result, Precedence.Call, precedence);
+          }
+          break;
+        case Syntax.NewExpression:
+          len = expr['arguments'].length;
+          allowUnparenthesizedNew = option.allowUnparenthesizedNew === undefined || option.allowUnparenthesizedNew;
+          result = join('new', generateExpression(expr.callee, {
+            precedence: Precedence.New,
+            allowIn: true,
+            allowCall: false,
+            allowUnparenthesizedNew: allowUnparenthesizedNew && !parentheses && len === 0
+          }));
+          if (!allowUnparenthesizedNew || parentheses || len > 0) {
+            result.push('(');
+            for (i = 0; i < len; i += 1) {
+              result.push(generateExpression(expr['arguments'][i], {
+                precedence: Precedence.Assignment,
+                allowIn: true,
+                allowCall: true
+              }));
+              if (i + 1 < len) {
+                result.push(',' + space);
+              }
+            }
+            result.push(')');
+          }
+          result = parenthesize(result, Precedence.New, precedence);
+          break;
+        case Syntax.MemberExpression:
+          result = [generateExpression(expr.object, {
+              precedence: Precedence.Call,
+              allowIn: true,
+              allowCall: allowCall,
+              allowUnparenthesizedNew: false
+            })];
+          if (expr.computed) {
+            result.push('[', generateExpression(expr.property, {
+              precedence: Precedence.Sequence,
+              allowIn: true,
+              allowCall: allowCall
+            }), ']');
+          } else {
+            if (expr.object.type === Syntax.Literal && typeof expr.object.value === 'number') {
+              fragment = toSourceNode(result).toString();
+              if (fragment.indexOf('.') < 0 && !/[eExX]/.test(fragment) && isDecimalDigit(fragment.charCodeAt(fragment.length - 1)) && !(fragment.length >= 2 && fragment.charCodeAt(0) === 48)) {
+                result.push('.');
+              }
+            }
+            result.push('.', generateIdentifier(expr.property));
+          }
+          result = parenthesize(result, Precedence.Member, precedence);
+          break;
+        case Syntax.UnaryExpression:
+          fragment = generateExpression(expr.argument, {
+            precedence: Precedence.Unary,
+            allowIn: true,
+            allowCall: true
+          });
+          if (space === '') {
+            result = join(expr.operator, fragment);
+          } else {
+            result = [expr.operator];
+            if (expr.operator.length > 2) {
+              result = join(result, fragment);
+            } else {
+              leftSource = toSourceNode(result).toString();
+              leftChar = leftSource.charAt(leftSource.length - 1);
+              rightChar = fragment.toString().charAt(0);
+              if ((leftChar === '+' || leftChar === '-') && leftChar === rightChar || isIdentifierPart(leftChar) && isIdentifierPart(rightChar)) {
+                result.push(noEmptySpace(), fragment);
+              } else {
+                result.push(fragment);
+              }
+            }
+          }
+          result = parenthesize(result, Precedence.Unary, precedence);
+          break;
+        case Syntax.YieldExpression:
+          if (expr.delegate) {
+            result = 'yield*';
+          } else {
+            result = 'yield';
+          }
+          if (expr.argument) {
+            result = join(result, generateExpression(expr.argument, {
+              precedence: Precedence.Assignment,
+              allowIn: true,
+              allowCall: true
+            }));
+          }
+          break;
+        case Syntax.UpdateExpression:
+          if (expr.prefix) {
+            result = parenthesize([
+              expr.operator,
+              generateExpression(expr.argument, {
+                precedence: Precedence.Unary,
+                allowIn: true,
+                allowCall: true
+              })
+            ], Precedence.Unary, precedence);
+          } else {
+            result = parenthesize([
+              generateExpression(expr.argument, {
+                precedence: Precedence.Postfix,
+                allowIn: true,
+                allowCall: true
+              }),
+              expr.operator
+            ], Precedence.Postfix, precedence);
+          }
+          break;
+        case Syntax.FunctionExpression:
+          result = 'function';
+          if (expr.id) {
+            result = [
+              result,
+              noEmptySpace(),
+              generateIdentifier(expr.id),
+              generateFunctionBody(expr)
+            ];
+          } else {
+            result = [
+              result + space,
+              generateFunctionBody(expr)
+            ];
+          }
+          break;
+        case Syntax.ArrayPattern:
+        case Syntax.ArrayExpression:
+          if (!expr.elements.length) {
+            result = '[]';
+            break;
+          }
+          multiline = expr.elements.length > 1;
+          result = [
+            '[',
+            multiline ? newline : ''
+          ];
+          withIndent(function (indent) {
+            for (i = 0, len = expr.elements.length; i < len; i += 1) {
+              if (!expr.elements[i]) {
+                if (multiline) {
+                  result.push(indent);
+                }
+                if (i + 1 === len) {
+                  result.push(',');
+                }
+              } else {
+                result.push(multiline ? indent : '', generateExpression(expr.elements[i], {
+                  precedence: Precedence.Assignment,
+                  allowIn: true,
+                  allowCall: true
+                }));
+              }
+              if (i + 1 < len) {
+                result.push(',' + (multiline ? newline : space));
+              }
+            }
+          });
+          if (multiline && !endsWithLineTerminator(toSourceNode(result).toString())) {
+            result.push(newline);
+          }
+          result.push(multiline ? base : '', ']');
+          break;
+        case Syntax.Property:
+          if (expr.kind === 'get' || expr.kind === 'set') {
+            result = [
+              expr.kind,
+              noEmptySpace(),
+              generateExpression(expr.key, {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              }),
+              generateFunctionBody(expr.value)
+            ];
+          } else {
+            if (expr.shorthand) {
+              result = generateExpression(expr.key, {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              });
+            } else if (expr.method) {
+              result = [];
+              if (expr.value.generator) {
+                result.push('*');
+              }
+              result.push(generateExpression(expr.key, {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              }), generateFunctionBody(expr.value));
+            } else {
+              result = [
+                generateExpression(expr.key, {
+                  precedence: Precedence.Sequence,
+                  allowIn: true,
+                  allowCall: true
+                }),
+                ':' + space,
+                generateExpression(expr.value, {
+                  precedence: Precedence.Assignment,
+                  allowIn: true,
+                  allowCall: true
+                })
+              ];
+            }
+          }
+          break;
+        case Syntax.ObjectExpression:
+          if (!expr.properties.length) {
+            result = '{}';
+            break;
+          }
+          multiline = expr.properties.length > 1;
+          withIndent(function () {
+            fragment = generateExpression(expr.properties[0], {
+              precedence: Precedence.Sequence,
+              allowIn: true,
+              allowCall: true,
+              type: Syntax.Property
+            });
+          });
+          if (!multiline) {
+            if (!hasLineTerminator(toSourceNode(fragment).toString())) {
+              result = [
+                '{',
+                space,
+                fragment,
+                space,
+                '}'
+              ];
+              break;
+            }
+          }
+          withIndent(function (indent) {
+            result = [
+              '{',
+              newline,
+              indent,
+              fragment
+            ];
+            if (multiline) {
+              result.push(',' + newline);
+              for (i = 1, len = expr.properties.length; i < len; i += 1) {
+                result.push(indent, generateExpression(expr.properties[i], {
+                  precedence: Precedence.Sequence,
+                  allowIn: true,
+                  allowCall: true,
+                  type: Syntax.Property
+                }));
+                if (i + 1 < len) {
+                  result.push(',' + newline);
+                }
+              }
+            }
+          });
+          if (!endsWithLineTerminator(toSourceNode(result).toString())) {
+            result.push(newline);
+          }
+          result.push(base, '}');
+          break;
+        case Syntax.ObjectPattern:
+          if (!expr.properties.length) {
+            result = '{}';
+            break;
+          }
+          multiline = false;
+          if (expr.properties.length === 1) {
+            property = expr.properties[0];
+            if (property.value.type !== Syntax.Identifier) {
+              multiline = true;
+            }
+          } else {
+            for (i = 0, len = expr.properties.length; i < len; i += 1) {
+              property = expr.properties[i];
+              if (!property.shorthand) {
+                multiline = true;
+                break;
+              }
+            }
+          }
+          result = [
+            '{',
+            multiline ? newline : ''
+          ];
+          withIndent(function (indent) {
+            for (i = 0, len = expr.properties.length; i < len; i += 1) {
+              result.push(multiline ? indent : '', generateExpression(expr.properties[i], {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              }));
+              if (i + 1 < len) {
+                result.push(',' + (multiline ? newline : space));
+              }
+            }
+          });
+          if (multiline && !endsWithLineTerminator(toSourceNode(result).toString())) {
+            result.push(newline);
+          }
+          result.push(multiline ? base : '', '}');
+          break;
+        case Syntax.ThisExpression:
+          result = 'this';
+          break;
+        case Syntax.Identifier:
+          result = generateIdentifier(expr);
+          break;
+        case Syntax.Literal:
+          if (expr.hasOwnProperty('raw') && parse) {
+            try {
+              raw = parse(expr.raw).body[0].expression;
+              if (raw.type === Syntax.Literal) {
+                if (raw.value === expr.value) {
+                  result = expr.raw;
+                  break;
+                }
+              }
+            } catch (e) {
+            }
+          }
+          if (expr.value === null) {
+            result = 'null';
+            break;
+          }
+          if (typeof expr.value === 'string') {
+            result = escapeString(expr.value);
+            break;
+          }
+          if (typeof expr.value === 'number') {
+            result = generateNumber(expr.value);
+            break;
+          }
+          if (typeof expr.value === 'boolean') {
+            result = expr.value ? 'true' : 'false';
+            break;
+          }
+          result = generateRegExp(expr.value);
+          break;
+        case Syntax.ComprehensionExpression:
+          result = [
+            '[',
+            generateExpression(expr.body, {
+              precedence: Precedence.Assignment,
+              allowIn: true,
+              allowCall: true
+            })
+          ];
+          if (expr.blocks) {
+            for (i = 0, len = expr.blocks.length; i < len; i += 1) {
+              fragment = generateExpression(expr.blocks[i], {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              });
+              result = join(result, fragment);
+            }
+          }
+          if (expr.filter) {
+            result = join(result, 'if' + space);
+            fragment = generateExpression(expr.filter, {
+              precedence: Precedence.Sequence,
+              allowIn: true,
+              allowCall: true
+            });
+            if (extra.moz.parenthesizedComprehensionBlock) {
+              result = join(result, [
+                '(',
+                fragment,
+                ')'
+              ]);
+            } else {
+              result = join(result, fragment);
+            }
+          }
+          result.push(']');
+          break;
+        case Syntax.ComprehensionBlock:
+          if (expr.left.type === Syntax.VariableDeclaration) {
+            fragment = [
+              expr.left.kind,
+              noEmptySpace(),
+              generateStatement(expr.left.declarations[0], { allowIn: false })
+            ];
+          } else {
+            fragment = generateExpression(expr.left, {
+              precedence: Precedence.Call,
+              allowIn: true,
+              allowCall: true
+            });
+          }
+          fragment = join(fragment, expr.of ? 'of' : 'in');
+          fragment = join(fragment, generateExpression(expr.right, {
+            precedence: Precedence.Sequence,
+            allowIn: true,
+            allowCall: true
+          }));
+          if (extra.moz.parenthesizedComprehensionBlock) {
+            result = [
+              'for' + space + '(',
+              fragment,
+              ')'
+            ];
+          } else {
+            result = join('for' + space, fragment);
+          }
+          break;
+        default:
+          throw new Error('Unknown expression type: ' + expr.type);
+        }
+        return toSourceNode(result, expr);
+      }
+      function generateStatement(stmt, option) {
+        var i, len, result, node, allowIn, functionBody, directiveContext, fragment, semicolon;
+        allowIn = true;
+        semicolon = ';';
+        functionBody = false;
+        directiveContext = false;
+        if (option) {
+          allowIn = option.allowIn === undefined || option.allowIn;
+          if (!semicolons && option.semicolonOptional === true) {
+            semicolon = '';
+          }
+          functionBody = option.functionBody;
+          directiveContext = option.directiveContext;
+        }
+        switch (stmt.type) {
+        case Syntax.BlockStatement:
+          result = [
+            '{',
+            newline
+          ];
+          withIndent(function () {
+            for (i = 0, len = stmt.body.length; i < len; i += 1) {
+              fragment = addIndent(generateStatement(stmt.body[i], {
+                semicolonOptional: i === len - 1,
+                directiveContext: functionBody
+              }));
+              result.push(fragment);
+              if (!endsWithLineTerminator(toSourceNode(fragment).toString())) {
+                result.push(newline);
+              }
+            }
+          });
+          result.push(addIndent('}'));
+          break;
+        case Syntax.BreakStatement:
+          if (stmt.label) {
+            result = 'break ' + stmt.label.name + semicolon;
+          } else {
+            result = 'break' + semicolon;
+          }
+          break;
+        case Syntax.ContinueStatement:
+          if (stmt.label) {
+            result = 'continue ' + stmt.label.name + semicolon;
+          } else {
+            result = 'continue' + semicolon;
+          }
+          break;
+        case Syntax.DirectiveStatement:
+          if (stmt.raw) {
+            result = stmt.raw + semicolon;
+          } else {
+            result = escapeDirective(stmt.directive) + semicolon;
+          }
+          break;
+        case Syntax.DoWhileStatement:
+          result = join('do', maybeBlock(stmt.body));
+          result = maybeBlockSuffix(stmt.body, result);
+          result = join(result, [
+            'while' + space + '(',
+            generateExpression(stmt.test, {
+              precedence: Precedence.Sequence,
+              allowIn: true,
+              allowCall: true
+            }),
+            ')' + semicolon
+          ]);
+          break;
+        case Syntax.CatchClause:
+          withIndent(function () {
+            result = [
+              'catch' + space + '(',
+              generateExpression(stmt.param, {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              }),
+              ')'
+            ];
+          });
+          result.push(maybeBlock(stmt.body));
+          break;
+        case Syntax.DebuggerStatement:
+          result = 'debugger' + semicolon;
+          break;
+        case Syntax.EmptyStatement:
+          result = ';';
+          break;
+        case Syntax.ExpressionStatement:
+          result = [generateExpression(stmt.expression, {
+              precedence: Precedence.Sequence,
+              allowIn: true,
+              allowCall: true
+            })];
+          fragment = toSourceNode(result).toString();
+          if (fragment.charAt(0) === '{' || fragment.slice(0, 8) === 'function' && ' ('.indexOf(fragment.charAt(8)) >= 0 || directive && directiveContext && stmt.expression.type === Syntax.Literal && typeof stmt.expression.value === 'string') {
+            result = [
+              '(',
+              result,
+              ')' + semicolon
+            ];
+          } else {
+            result.push(semicolon);
+          }
+          break;
+        case Syntax.VariableDeclarator:
+          if (stmt.init) {
+            result = [
+              generateExpression(stmt.id, {
+                precedence: Precedence.Assignment,
+                allowIn: allowIn,
+                allowCall: true
+              }),
+              space,
+              '=',
+              space,
+              generateExpression(stmt.init, {
+                precedence: Precedence.Assignment,
+                allowIn: allowIn,
+                allowCall: true
+              })
+            ];
+          } else {
+            result = generateIdentifier(stmt.id);
+          }
+          break;
+        case Syntax.VariableDeclaration:
+          result = [stmt.kind];
+          if (stmt.declarations.length === 1 && stmt.declarations[0].init && stmt.declarations[0].init.type === Syntax.FunctionExpression) {
+            result.push(noEmptySpace(), generateStatement(stmt.declarations[0], { allowIn: allowIn }));
+          } else {
+            withIndent(function () {
+              node = stmt.declarations[0];
+              if (extra.comment && node.leadingComments) {
+                result.push('\n', addIndent(generateStatement(node, { allowIn: allowIn })));
+              } else {
+                result.push(noEmptySpace(), generateStatement(node, { allowIn: allowIn }));
+              }
+              for (i = 1, len = stmt.declarations.length; i < len; i += 1) {
+                node = stmt.declarations[i];
+                if (extra.comment && node.leadingComments) {
+                  result.push(',' + newline, addIndent(generateStatement(node, { allowIn: allowIn })));
+                } else {
+                  result.push(',' + space, generateStatement(node, { allowIn: allowIn }));
+                }
+              }
+            });
+          }
+          result.push(semicolon);
+          break;
+        case Syntax.ThrowStatement:
+          result = [
+            join('throw', generateExpression(stmt.argument, {
+              precedence: Precedence.Sequence,
+              allowIn: true,
+              allowCall: true
+            })),
+            semicolon
+          ];
+          break;
+        case Syntax.TryStatement:
+          result = [
+            'try',
+            maybeBlock(stmt.block)
+          ];
+          result = maybeBlockSuffix(stmt.block, result);
+          if (stmt.handlers) {
+            for (i = 0, len = stmt.handlers.length; i < len; i += 1) {
+              result = join(result, generateStatement(stmt.handlers[i]));
+              if (stmt.finalizer || i + 1 !== len) {
+                result = maybeBlockSuffix(stmt.handlers[i].body, result);
+              }
+            }
+          } else {
+            if (stmt.handler) {
+              result = join(result, generateStatement(stmt.handler));
+              if (stmt.finalizer || stmt.guardedHandlers.length > 0) {
+                result = maybeBlockSuffix(stmt.handler.body, result);
+              }
+            }
+            for (i = 0, len = stmt.guardedHandlers.length; i < len; i += 1) {
+              result = join(result, generateStatement(stmt.guardedHandlers[i]));
+              if (stmt.finalizer || i + 1 !== len) {
+                result = maybeBlockSuffix(stmt.guardedHandlers[i].body, result);
+              }
+            }
+          }
+          if (stmt.finalizer) {
+            result = join(result, [
+              'finally',
+              maybeBlock(stmt.finalizer)
+            ]);
+          }
+          break;
+        case Syntax.SwitchStatement:
+          withIndent(function () {
+            result = [
+              'switch' + space + '(',
+              generateExpression(stmt.discriminant, {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              }),
+              ')' + space + '{' + newline
+            ];
+          });
+          if (stmt.cases) {
+            for (i = 0, len = stmt.cases.length; i < len; i += 1) {
+              fragment = addIndent(generateStatement(stmt.cases[i], { semicolonOptional: i === len - 1 }));
+              result.push(fragment);
+              if (!endsWithLineTerminator(toSourceNode(fragment).toString())) {
+                result.push(newline);
+              }
+            }
+          }
+          result.push(addIndent('}'));
+          break;
+        case Syntax.SwitchCase:
+          withIndent(function () {
+            if (stmt.test) {
+              result = [
+                join('case', generateExpression(stmt.test, {
+                  precedence: Precedence.Sequence,
+                  allowIn: true,
+                  allowCall: true
+                })),
+                ':'
+              ];
+            } else {
+              result = ['default:'];
+            }
+            i = 0;
+            len = stmt.consequent.length;
+            if (len && stmt.consequent[0].type === Syntax.BlockStatement) {
+              fragment = maybeBlock(stmt.consequent[0]);
+              result.push(fragment);
+              i = 1;
+            }
+            if (i !== len && !endsWithLineTerminator(toSourceNode(result).toString())) {
+              result.push(newline);
+            }
+            for (; i < len; i += 1) {
+              fragment = addIndent(generateStatement(stmt.consequent[i], { semicolonOptional: i === len - 1 && semicolon === '' }));
+              result.push(fragment);
+              if (i + 1 !== len && !endsWithLineTerminator(toSourceNode(fragment).toString())) {
+                result.push(newline);
+              }
+            }
+          });
+          break;
+        case Syntax.IfStatement:
+          withIndent(function () {
+            result = [
+              'if' + space + '(',
+              generateExpression(stmt.test, {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              }),
+              ')'
+            ];
+          });
+          if (stmt.alternate) {
+            result.push(maybeBlock(stmt.consequent));
+            result = maybeBlockSuffix(stmt.consequent, result);
+            if (stmt.alternate.type === Syntax.IfStatement) {
+              result = join(result, [
+                'else ',
+                generateStatement(stmt.alternate, { semicolonOptional: semicolon === '' })
+              ]);
+            } else {
+              result = join(result, join('else', maybeBlock(stmt.alternate, semicolon === '')));
+            }
+          } else {
+            result.push(maybeBlock(stmt.consequent, semicolon === ''));
+          }
+          break;
+        case Syntax.ForStatement:
+          withIndent(function () {
+            result = ['for' + space + '('];
+            if (stmt.init) {
+              if (stmt.init.type === Syntax.VariableDeclaration) {
+                result.push(generateStatement(stmt.init, { allowIn: false }));
+              } else {
+                result.push(generateExpression(stmt.init, {
+                  precedence: Precedence.Sequence,
+                  allowIn: false,
+                  allowCall: true
+                }), ';');
+              }
+            } else {
+              result.push(';');
+            }
+            if (stmt.test) {
+              result.push(space, generateExpression(stmt.test, {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              }), ';');
+            } else {
+              result.push(';');
+            }
+            if (stmt.update) {
+              result.push(space, generateExpression(stmt.update, {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              }), ')');
+            } else {
+              result.push(')');
+            }
+          });
+          result.push(maybeBlock(stmt.body, semicolon === ''));
+          break;
+        case Syntax.ForInStatement:
+          result = ['for' + space + '('];
+          withIndent(function () {
+            if (stmt.left.type === Syntax.VariableDeclaration) {
+              withIndent(function () {
+                result.push(stmt.left.kind + noEmptySpace(), generateStatement(stmt.left.declarations[0], { allowIn: false }));
+              });
+            } else {
+              result.push(generateExpression(stmt.left, {
+                precedence: Precedence.Call,
+                allowIn: true,
+                allowCall: true
+              }));
+            }
+            result = join(result, 'in');
+            result = [
+              join(result, generateExpression(stmt.right, {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              })),
+              ')'
+            ];
+          });
+          result.push(maybeBlock(stmt.body, semicolon === ''));
+          break;
+        case Syntax.LabeledStatement:
+          result = [
+            stmt.label.name + ':',
+            maybeBlock(stmt.body, semicolon === '')
+          ];
+          break;
+        case Syntax.Program:
+          len = stmt.body.length;
+          result = [safeConcatenation && len > 0 ? '\n' : ''];
+          for (i = 0; i < len; i += 1) {
+            fragment = addIndent(generateStatement(stmt.body[i], {
+              semicolonOptional: !safeConcatenation && i === len - 1,
+              directiveContext: true
+            }));
+            result.push(fragment);
+            if (i + 1 < len && !endsWithLineTerminator(toSourceNode(fragment).toString())) {
+              result.push(newline);
+            }
+          }
+          break;
+        case Syntax.FunctionDeclaration:
+          result = [
+            stmt.generator && !extra.moz.starlessGenerator ? 'function* ' : 'function ',
+            generateIdentifier(stmt.id),
+            generateFunctionBody(stmt)
+          ];
+          break;
+        case Syntax.ReturnStatement:
+          if (stmt.argument) {
+            result = [
+              join('return', generateExpression(stmt.argument, {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              })),
+              semicolon
+            ];
+          } else {
+            result = ['return' + semicolon];
+          }
+          break;
+        case Syntax.WhileStatement:
+          withIndent(function () {
+            result = [
+              'while' + space + '(',
+              generateExpression(stmt.test, {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              }),
+              ')'
+            ];
+          });
+          result.push(maybeBlock(stmt.body, semicolon === ''));
+          break;
+        case Syntax.WithStatement:
+          withIndent(function () {
+            result = [
+              'with' + space + '(',
+              generateExpression(stmt.object, {
+                precedence: Precedence.Sequence,
+                allowIn: true,
+                allowCall: true
+              }),
+              ')'
+            ];
+          });
+          result.push(maybeBlock(stmt.body, semicolon === ''));
+          break;
+        default:
+          throw new Error('Unknown statement type: ' + stmt.type);
+        }
+        if (extra.comment) {
+          result = addCommentsToStatement(stmt, result);
+        }
+        fragment = toSourceNode(result).toString();
+        if (stmt.type === Syntax.Program && !safeConcatenation && newline === '' && fragment.charAt(fragment.length - 1) === '\n') {
+          result = toSourceNode(result).replaceRight(/\s+$/, '');
+        }
+        return toSourceNode(result, stmt);
+      }
+      function generate(node, options) {
+        var defaultOptions = getDefaultOptions(), result, pair;
+        if (options != null) {
+          if (typeof options.indent === 'string') {
+            defaultOptions.format.indent.style = options.indent;
+          }
+          if (typeof options.base === 'number') {
+            defaultOptions.format.indent.base = options.base;
+          }
+          options = updateDeeply(defaultOptions, options);
+          indent = options.format.indent.style;
+          if (typeof options.base === 'string') {
+            base = options.base;
+          } else {
+            base = stringRepeat(indent, options.format.indent.base);
+          }
+        } else {
+          options = defaultOptions;
+          indent = options.format.indent.style;
+          base = stringRepeat(indent, options.format.indent.base);
+        }
+        json = options.format.json;
+        renumber = options.format.renumber;
+        hexadecimal = json ? false : options.format.hexadecimal;
+        quotes = json ? 'double' : options.format.quotes;
+        escapeless = options.format.escapeless;
+        newline = options.format.newline;
+        space = options.format.space;
+        if (options.format.compact) {
+          newline = space = indent = base = '';
+        }
+        parentheses = options.format.parentheses;
+        semicolons = options.format.semicolons;
+        safeConcatenation = options.format.safeConcatenation;
+        directive = options.directive;
+        parse = json ? null : options.parse;
+        sourceMap = options.sourceMap;
+        extra = options;
+        if (sourceMap) {
+          if (!exports.browser) {
+            SourceNode = require('/node_modules/source-map/lib/source-map.js', module).SourceNode;
+          } else {
+            SourceNode = global.sourceMap.SourceNode;
+          }
+        } else {
+          SourceNode = SourceNodeMock;
+        }
+        switch (node.type) {
+        case Syntax.BlockStatement:
+        case Syntax.BreakStatement:
+        case Syntax.CatchClause:
+        case Syntax.ContinueStatement:
+        case Syntax.DirectiveStatement:
+        case Syntax.DoWhileStatement:
+        case Syntax.DebuggerStatement:
+        case Syntax.EmptyStatement:
+        case Syntax.ExpressionStatement:
+        case Syntax.ForStatement:
+        case Syntax.ForInStatement:
+        case Syntax.FunctionDeclaration:
+        case Syntax.IfStatement:
+        case Syntax.LabeledStatement:
+        case Syntax.Program:
+        case Syntax.ReturnStatement:
+        case Syntax.SwitchStatement:
+        case Syntax.SwitchCase:
+        case Syntax.ThrowStatement:
+        case Syntax.TryStatement:
+        case Syntax.VariableDeclaration:
+        case Syntax.VariableDeclarator:
+        case Syntax.WhileStatement:
+        case Syntax.WithStatement:
+          result = generateStatement(node);
+          break;
+        case Syntax.AssignmentExpression:
+        case Syntax.ArrayExpression:
+        case Syntax.ArrayPattern:
+        case Syntax.BinaryExpression:
+        case Syntax.CallExpression:
+        case Syntax.ConditionalExpression:
+        case Syntax.FunctionExpression:
+        case Syntax.Identifier:
+        case Syntax.Literal:
+        case Syntax.LogicalExpression:
+        case Syntax.MemberExpression:
+        case Syntax.NewExpression:
+        case Syntax.ObjectExpression:
+        case Syntax.ObjectPattern:
+        case Syntax.Property:
+        case Syntax.SequenceExpression:
+        case Syntax.ThisExpression:
+        case Syntax.UnaryExpression:
+        case Syntax.UpdateExpression:
+        case Syntax.YieldExpression:
+          result = generateExpression(node, {
+            precedence: Precedence.Sequence,
+            allowIn: true,
+            allowCall: true
+          });
+          break;
+        default:
+          throw new Error('Unknown node type: ' + node.type);
+        }
+        if (!sourceMap) {
+          return result.toString();
+        }
+        pair = result.toStringWithSourceMap({
+          file: options.file,
+          sourceRoot: options.sourceMapRoot
+        });
+        if (options.sourceMapWithCode) {
+          return pair;
+        }
+        return pair.map.toString();
+      }
+      FORMAT_MINIFY = {
+        indent: {
+          style: '',
+          base: 0
+        },
+        renumber: true,
+        hexadecimal: true,
+        quotes: 'auto',
+        escapeless: true,
+        compact: true,
+        parentheses: false,
+        semicolons: false
+      };
+      FORMAT_DEFAULTS = getDefaultOptions().format;
+      exports.version = require('/package.json', module).version;
+      exports.generate = generate;
+      exports.attachComments = estraverse.attachComments;
+      exports.browser = false;
+      exports.FORMAT_MINIFY = FORMAT_MINIFY;
+      exports.FORMAT_DEFAULTS = FORMAT_DEFAULTS;
+    }());
+  });
+  require.define('/package.json', function (module, exports, __dirname, __filename) {
+    module.exports = {
+      'name': 'escodegen',
+      'description': 'ECMAScript code generator',
+      'homepage': 'http://github.com/Constellation/escodegen.html',
+      'main': 'escodegen.js',
+      'bin': {
+        'esgenerate': './bin/esgenerate.js',
+        'escodegen': './bin/escodegen.js'
+      },
+      'version': '0.0.28-dev',
+      'engines': { 'node': '>=0.4.0' },
+      'maintainers': [{
+          'name': 'Yusuke Suzuki',
+          'email': 'utatane.tea@gmail.com',
+          'web': 'http://github.com/Constellation'
+        }],
+      'repository': {
+        'type': 'git',
+        'url': 'http://github.com/Constellation/escodegen.git'
+      },
+      'dependencies': {
+        'esprima': '~1.0.2',
+        'estraverse': '~1.3.0'
+      },
+      'optionalDependencies': { 'source-map': '>= 0.1.2' },
+      'devDependencies': {
+        'esprima-moz': '*',
+        'commonjs-everywhere': '~0.8.0',
+        'q': '*',
+        'bower': '*',
+        'semver': '*',
+        'chai': '~1.7.2',
+        'grunt-contrib-jshint': '~0.5.0',
+        'grunt-cli': '~0.1.9',
+        'grunt': '~0.4.1',
+        'grunt-mocha-test': '~0.6.2'
+      },
+      'licenses': [{
+          'type': 'BSD',
+          'url': 'http://github.com/Constellation/escodegen/raw/master/LICENSE.BSD'
+        }],
+      'scripts': {
+        'test': 'grunt travis',
+        'unit-test': 'grunt test',
+        'lint': 'grunt lint',
+        'release': 'node tools/release.js',
+        'build-min': './node_modules/.bin/cjsify -ma path: tools/entry-point.js > escodegen.browser.min.js',
+        'build': './node_modules/.bin/cjsify -a path: tools/entry-point.js > escodegen.browser.js'
+      }
+    };
+  });
+  require.define('/node_modules/source-map/lib/source-map.js', function (module, exports, __dirname, __filename) {
+    exports.SourceMapGenerator = require('/node_modules/source-map/lib/source-map/source-map-generator.js', module).SourceMapGenerator;
+    exports.SourceMapConsumer = require('/node_modules/source-map/lib/source-map/source-map-consumer.js', module).SourceMapConsumer;
+    exports.SourceNode = require('/node_modules/source-map/lib/source-map/source-node.js', module).SourceNode;
+  });
+  require.define('/node_modules/source-map/lib/source-map/source-node.js', function (module, exports, __dirname, __filename) {
+    if (typeof define !== 'function') {
+      var define = require('/node_modules/source-map/node_modules/amdefine/amdefine.js', module)(module, require);
+    }
+    define(function (require, exports, module) {
+      var SourceMapGenerator = require('/node_modules/source-map/lib/source-map/source-map-generator.js', module).SourceMapGenerator;
+      var util = require('/node_modules/source-map/lib/source-map/util.js', module);
+      function SourceNode(aLine, aColumn, aSource, aChunks, aName) {
+        this.children = [];
+        this.sourceContents = {};
+        this.line = aLine === undefined ? null : aLine;
+        this.column = aColumn === undefined ? null : aColumn;
+        this.source = aSource === undefined ? null : aSource;
+        this.name = aName === undefined ? null : aName;
+        if (aChunks != null)
+          this.add(aChunks);
+      }
+      SourceNode.fromStringWithSourceMap = function SourceNode_fromStringWithSourceMap(aGeneratedCode, aSourceMapConsumer) {
+        var node = new SourceNode;
+        var remainingLines = aGeneratedCode.split('\n');
+        var lastGeneratedLine = 1, lastGeneratedColumn = 0;
+        var lastMapping = null;
+        aSourceMapConsumer.eachMapping(function (mapping) {
+          if (lastMapping === null) {
+            while (lastGeneratedLine < mapping.generatedLine) {
+              node.add(remainingLines.shift() + '\n');
+              lastGeneratedLine++;
+            }
+            if (lastGeneratedColumn < mapping.generatedColumn) {
+              var nextLine = remainingLines[0];
+              node.add(nextLine.substr(0, mapping.generatedColumn));
+              remainingLines[0] = nextLine.substr(mapping.generatedColumn);
+              lastGeneratedColumn = mapping.generatedColumn;
+            }
+          } else {
+            if (lastGeneratedLine < mapping.generatedLine) {
+              var code = '';
+              do {
+                code += remainingLines.shift() + '\n';
+                lastGeneratedLine++;
+                lastGeneratedColumn = 0;
+              } while (lastGeneratedLine < mapping.generatedLine);
+              if (lastGeneratedColumn < mapping.generatedColumn) {
+                var nextLine = remainingLines[0];
+                code += nextLine.substr(0, mapping.generatedColumn);
+                remainingLines[0] = nextLine.substr(mapping.generatedColumn);
+                lastGeneratedColumn = mapping.generatedColumn;
+              }
+              addMappingWithCode(lastMapping, code);
+            } else {
+              var nextLine = remainingLines[0];
+              var code = nextLine.substr(0, mapping.generatedColumn - lastGeneratedColumn);
+              remainingLines[0] = nextLine.substr(mapping.generatedColumn - lastGeneratedColumn);
+              lastGeneratedColumn = mapping.generatedColumn;
+              addMappingWithCode(lastMapping, code);
+            }
+          }
+          lastMapping = mapping;
+        }, this);
+        addMappingWithCode(lastMapping, remainingLines.join('\n'));
+        aSourceMapConsumer.sources.forEach(function (sourceFile) {
+          var content = aSourceMapConsumer.sourceContentFor(sourceFile);
+          if (content) {
+            node.setSourceContent(sourceFile, content);
+          }
+        });
+        return node;
+        function addMappingWithCode(mapping, code) {
+          if (mapping === null || mapping.source === undefined) {
+            node.add(code);
+          } else {
+            node.add(new SourceNode(mapping.originalLine, mapping.originalColumn, mapping.source, code, mapping.name));
+          }
+        }
+      };
+      SourceNode.prototype.add = function SourceNode_add(aChunk) {
+        if (Array.isArray(aChunk)) {
+          aChunk.forEach(function (chunk) {
+            this.add(chunk);
+          }, this);
+        } else if (aChunk instanceof SourceNode || 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;
+      };
+      SourceNode.prototype.prepend = function SourceNode_prepend(aChunk) {
+        if (Array.isArray(aChunk)) {
+          for (var i = aChunk.length - 1; i >= 0; i--) {
+            this.prepend(aChunk[i]);
+          }
+        } else if (aChunk instanceof SourceNode || 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;
+      };
+      SourceNode.prototype.walk = function SourceNode_walk(aFn) {
+        this.children.forEach(function (chunk) {
+          if (chunk instanceof SourceNode) {
+            chunk.walk(aFn);
+          } else {
+            if (chunk !== '') {
+              aFn(chunk, {
+                source: this.source,
+                line: this.line,
+                column: this.column,
+                name: this.name
+              });
+            }
+          }
+        }, this);
+      };
+      SourceNode.prototype.join = function SourceNode_join(aSep) {
+        var newChildren;
+        var i;
+        var 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;
+      };
+      SourceNode.prototype.replaceRight = function SourceNode_replaceRight(aPattern, aReplacement) {
+        var lastChild = this.children[this.children.length - 1];
+        if (lastChild instanceof SourceNode) {
+          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;
+      };
+      SourceNode.prototype.setSourceContent = function SourceNode_setSourceContent(aSourceFile, aSourceContent) {
+        this.sourceContents[util.toSetString(aSourceFile)] = aSourceContent;
+      };
+      SourceNode.prototype.walkSourceContents = function SourceNode_walkSourceContents(aFn) {
+        this.children.forEach(function (chunk) {
+          if (chunk instanceof SourceNode) {
+            chunk.walkSourceContents(aFn);
+          }
+        }, this);
+        Object.keys(this.sourceContents).forEach(function (sourceFileKey) {
+          aFn(util.fromSetString(sourceFileKey), this.sourceContents[sourceFileKey]);
+        }, this);
+      };
+      SourceNode.prototype.toString = function SourceNode_toString() {
+        var str = '';
+        this.walk(function (chunk) {
+          str += chunk;
+        });
+        return str;
+      };
+      SourceNode.prototype.toStringWithSourceMap = function SourceNode_toStringWithSourceMap(aArgs) {
+        var generated = {
+            code: '',
+            line: 1,
+            column: 0
+          };
+        var map = new SourceMapGenerator(aArgs);
+        var sourceMappingActive = false;
+        var lastOriginalSource = null;
+        var lastOriginalLine = null;
+        var lastOriginalColumn = null;
+        var 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;
+          }
+          chunk.split('').forEach(function (ch) {
+            if (ch === '\n') {
+              generated.line++;
+              generated.column = 0;
+            } else {
+              generated.column++;
+            }
+          });
+        });
+        this.walkSourceContents(function (sourceFile, sourceContent) {
+          map.setSourceContent(sourceFile, sourceContent);
+        });
+        return {
+          code: generated.code,
+          map: map
+        };
+      };
+      exports.SourceNode = SourceNode;
+    });
+  });
+  require.define('/node_modules/source-map/lib/source-map/util.js', function (module, exports, __dirname, __filename) {
+    if (typeof define !== 'function') {
+      var define = require('/node_modules/source-map/node_modules/amdefine/amdefine.js', module)(module, require);
+    }
+    define(function (require, exports, module) {
+      function getArg(aArgs, aName, aDefaultValue) {
+        if (aName in aArgs) {
+          return aArgs[aName];
+        } else if (arguments.length === 3) {
+          return aDefaultValue;
+        } else {
+          throw new Error('"' + aName + '" is a required argument.');
+        }
+      }
+      exports.getArg = getArg;
+      var urlRegexp = /([\w+\-.]+):\/\/((\w+:\w+)@)?([\w.]+)?(:(\d+))?(\S+)?/;
+      function urlParse(aUrl) {
+        var match = aUrl.match(urlRegexp);
+        if (!match) {
+          return null;
+        }
+        return {
+          scheme: match[1],
+          auth: match[3],
+          host: match[4],
+          port: match[6],
+          path: match[7]
+        };
+      }
+      exports.urlParse = urlParse;
+      function urlGenerate(aParsedUrl) {
+        var url = aParsedUrl.scheme + '://';
+        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;
+      function join(aRoot, aPath) {
+        var url;
+        if (aPath.match(urlRegexp)) {
+          return aPath;
+        }
+        if (aPath.charAt(0) === '/' && (url = urlParse(aRoot))) {
+          url.path = aPath;
+          return urlGenerate(url);
+        }
+        return aRoot.replace(/\/$/, '') + '/' + aPath;
+      }
+      exports.join = join;
+      function toSetString(aStr) {
+        return '$' + aStr;
+      }
+      exports.toSetString = toSetString;
+      function fromSetString(aStr) {
+        return aStr.substr(1);
+      }
+      exports.fromSetString = fromSetString;
+      function relative(aRoot, aPath) {
+        aRoot = aRoot.replace(/\/$/, '');
+        var url = urlParse(aRoot);
+        if (aPath.charAt(0) == '/' && url && url.path == '/') {
+          return aPath.slice(1);
+        }
+        return aPath.indexOf(aRoot + '/') === 0 ? aPath.substr(aRoot.length + 1) : aPath;
+      }
+      exports.relative = relative;
+    });
+  });
+  require.define('/node_modules/source-map/node_modules/amdefine/amdefine.js', function (module, exports, __dirname, __filename) {
+    'use strict';
+    function amdefine(module, requireFn) {
+      'use strict';
+      var defineCache = {}, loaderCache = {}, alreadyCalled = false, path = require('path', module), makeRequire, stringRequire;
+      function trimDots(ary) {
+        var i, part;
+        for (i = 0; ary[i]; i += 1) {
+          part = ary[i];
+          if (part === '.') {
+            ary.splice(i, 1);
+            i -= 1;
+          } else if (part === '..') {
+            if (i === 1 && (ary[2] === '..' || ary[0] === '..')) {
+              break;
+            } else if (i > 0) {
+              ary.splice(i - 1, 2);
+              i -= 2;
+            }
+          }
+        }
+      }
+      function normalize(name, baseName) {
+        var baseParts;
+        if (name && name.charAt(0) === '.') {
+          if (baseName) {
+            baseParts = baseName.split('/');
+            baseParts = baseParts.slice(0, baseParts.length - 1);
+            baseParts = baseParts.concat(name.split('/'));
+            trimDots(baseParts);
+            name = baseParts.join('/');
+          }
+        }
+        return name;
+      }
+      function makeNormalize(relName) {
+        return function (name) {
+          return normalize(name, relName);
+        };
+      }
+      function makeLoad(id) {
+        function load(value) {
+          loaderCache[id] = value;
+        }
+        load.fromText = function (id, text) {
+          throw new Error('amdefine does not implement load.fromText');
+        };
+        return load;
+      }
+      makeRequire = function (systemRequire, exports, module, relId) {
+        function amdRequire(deps, callback) {
+          if (typeof deps === 'string') {
+            return stringRequire(systemRequire, exports, module, deps, relId);
+          } else {
+            deps = deps.map(function (depName) {
+              return stringRequire(systemRequire, exports, module, depName, relId);
+            });
+            process.nextTick(function () {
+              callback.apply(null, deps);
+            });
+          }
+        }
+        amdRequire.toUrl = function (filePath) {
+          if (filePath.indexOf('.') === 0) {
+            return normalize(filePath, path.dirname(module.filename));
+          } else {
+            return filePath;
+          }
+        };
+        return amdRequire;
+      };
+      requireFn = requireFn || function req() {
+        return module.require.apply(module, arguments);
+      };
+      function runFactory(id, deps, factory) {
+        var r, e, m, result;
+        if (id) {
+          e = loaderCache[id] = {};
+          m = {
+            id: id,
+            uri: __filename,
+            exports: e
+          };
+          r = makeRequire(requireFn, e, m, id);
+        } else {
+          if (alreadyCalled) {
+            throw new Error('amdefine with no module ID cannot be called more than once per file.');
+          }
+          alreadyCalled = true;
+          e = module.exports;
+          m = module;
+          r = makeRequire(requireFn, e, m, module.id);
+        }
+        if (deps) {
+          deps = deps.map(function (depName) {
+            return r(depName);
+          });
+        }
+        if (typeof factory === 'function') {
+          result = factory.apply(m.exports, deps);
+        } else {
+          result = factory;
+        }
+        if (result !== undefined) {
+          m.exports = result;
+          if (id) {
+            loaderCache[id] = m.exports;
+          }
+        }
+      }
+      stringRequire = function (systemRequire, exports, module, id, relId) {
+        var index = id.indexOf('!'), originalId = id, prefix, plugin;
+        if (index === -1) {
+          id = normalize(id, relId);
+          if (id === 'require') {
+            return makeRequire(systemRequire, exports, module, relId);
+          } else if (id === 'exports') {
+            return exports;
+          } else if (id === 'module') {
+            return module;
+          } else if (loaderCache.hasOwnProperty(id)) {
+            return loaderCache[id];
+          } else if (defineCache[id]) {
+            runFactory.apply(null, defineCache[id]);
+            return loaderCache[id];
+          } else {
+            if (systemRequire) {
+              return systemRequire(originalId);
+            } else {
+              throw new Error('No module with ID: ' + id);
+            }
+          }
+        } else {
+          prefix = id.substring(0, index);
+          id = id.substring(index + 1, id.length);
+          plugin = stringRequire(systemRequire, exports, module, prefix, relId);
+          if (plugin.normalize) {
+            id = plugin.normalize(id, makeNormalize(relId));
+          } else {
+            id = normalize(id, relId);
+          }
+          if (loaderCache[id]) {
+            return loaderCache[id];
+          } else {
+            plugin.load(id, makeRequire(systemRequire, exports, module, relId), makeLoad(id), {});
+            return loaderCache[id];
+          }
+        }
+      };
+      function define(id, deps, factory) {
+        if (Array.isArray(id)) {
+          factory = deps;
+          deps = id;
+          id = undefined;
+        } else if (typeof id !== 'string') {
+          factory = id;
+          id = deps = undefined;
+        }
+        if (deps && !Array.isArray(deps)) {
+          factory = deps;
+          deps = undefined;
+        }
+        if (!deps) {
+          deps = [
+            'require',
+            'exports',
+            'module'
+          ];
+        }
+        if (id) {
+          defineCache[id] = [
+            id,
+            deps,
+            factory
+          ];
+        } else {
+          runFactory(id, deps, factory);
+        }
+      }
+      define.require = function (id) {
+        if (loaderCache[id]) {
+          return loaderCache[id];
+        }
+        if (defineCache[id]) {
+          runFactory.apply(null, defineCache[id]);
+          return loaderCache[id];
+        }
+      };
+      define.amd = {};
+      return define;
+    }
+    module.exports = amdefine;
+  });
+  require.define('/node_modules/source-map/lib/source-map/source-map-generator.js', function (module, exports, __dirname, __filename) {
+    if (typeof define !== 'function') {
+      var define = require('/node_modules/source-map/node_modules/amdefine/amdefine.js', module)(module, require);
+    }
+    define(function (require, exports, module) {
+      var base64VLQ = require('/node_modules/source-map/lib/source-map/base64-vlq.js', module);
+      var util = require('/node_modules/source-map/lib/source-map/util.js', module);
+      var ArraySet = require('/node_modules/source-map/lib/source-map/array-set.js', module).ArraySet;
+      function SourceMapGenerator(aArgs) {
+        this._file = util.getArg(aArgs, 'file');
+        this._sourceRoot = util.getArg(aArgs, 'sourceRoot', null);
+        this._sources = new ArraySet;
+        this._names = new ArraySet;
+        this._mappings = [];
+        this._sourcesContents = null;
+      }
+      SourceMapGenerator.prototype._version = 3;
+      SourceMapGenerator.fromSourceMap = function SourceMapGenerator_fromSourceMap(aSourceMapConsumer) {
+        var sourceRoot = aSourceMapConsumer.sourceRoot;
+        var generator = new SourceMapGenerator({
+            file: aSourceMapConsumer.file,
+            sourceRoot: sourceRoot
+          });
+        aSourceMapConsumer.eachMapping(function (mapping) {
+          var newMapping = {
+              generated: {
+                line: mapping.generatedLine,
+                column: mapping.generatedColumn
+              }
+            };
+          if (mapping.source) {
+            newMapping.source = mapping.source;
+            if (sourceRoot) {
+              newMapping.source = util.relative(sourceRoot, newMapping.source);
+            }
+            newMapping.original = {
+              line: mapping.originalLine,
+              column: mapping.originalColumn
+            };
+            if (mapping.name) {
+              newMapping.name = mapping.name;
+            }
+          }
+          generator.addMapping(newMapping);
+        });
+        aSourceMapConsumer.sources.forEach(function (sourceFile) {
+          var content = aSourceMapConsumer.sourceContentFor(sourceFile);
+          if (content) {
+            generator.setSourceContent(sourceFile, content);
+          }
+        });
+        return generator;
+      };
+      SourceMapGenerator.prototype.addMapping = function SourceMapGenerator_addMapping(aArgs) {
+        var generated = util.getArg(aArgs, 'generated');
+        var original = util.getArg(aArgs, 'original', null);
+        var source = util.getArg(aArgs, 'source', null);
+        var name = util.getArg(aArgs, 'name', null);
+        this._validateMapping(generated, original, source, name);
+        if (source && !this._sources.has(source)) {
+          this._sources.add(source);
+        }
+        if (name && !this._names.has(name)) {
+          this._names.add(name);
+        }
+        this._mappings.push({
+          generated: generated,
+          original: original,
+          source: source,
+          name: name
+        });
+      };
+      SourceMapGenerator.prototype.setSourceContent = function SourceMapGenerator_setSourceContent(aSourceFile, aSourceContent) {
+        var source = aSourceFile;
+        if (this._sourceRoot) {
+          source = util.relative(this._sourceRoot, source);
+        }
+        if (aSourceContent !== null) {
+          if (!this._sourcesContents) {
+            this._sourcesContents = {};
+          }
+          this._sourcesContents[util.toSetString(source)] = aSourceContent;
+        } else {
+          delete this._sourcesContents[util.toSetString(source)];
+          if (Object.keys(this._sourcesContents).length === 0) {
+            this._sourcesContents = null;
+          }
+        }
+      };
+      SourceMapGenerator.prototype.applySourceMap = function SourceMapGenerator_applySourceMap(aSourceMapConsumer, aSourceFile) {
+        if (!aSourceFile) {
+          aSourceFile = aSourceMapConsumer.file;
+        }
+        var sourceRoot = this._sourceRoot;
+        if (sourceRoot) {
+          aSourceFile = util.relative(sourceRoot, aSourceFile);
+        }
+        var newSources = new ArraySet;
+        var newNames = new ArraySet;
+        this._mappings.forEach(function (mapping) {
+          if (mapping.source === aSourceFile && mapping.original) {
+            var original = aSourceMapConsumer.originalPositionFor({
+                line: mapping.original.line,
+                column: mapping.original.column
+              });
+            if (original.source !== null) {
+              if (sourceRoot) {
+                mapping.source = util.relative(sourceRoot, original.source);
+              } else {
+                mapping.source = original.source;
+              }
+              mapping.original.line = original.line;
+              mapping.original.column = original.column;
+              if (original.name !== null && mapping.name !== null) {
+                mapping.name = original.name;
+              }
+            }
+          }
+          var source = mapping.source;
+          if (source && !newSources.has(source)) {
+            newSources.add(source);
+          }
+          var name = mapping.name;
+          if (name && !newNames.has(name)) {
+            newNames.add(name);
+          }
+        }, this);
+        this._sources = newSources;
+        this._names = newNames;
+        aSourceMapConsumer.sources.forEach(function (sourceFile) {
+          var content = aSourceMapConsumer.sourceContentFor(sourceFile);
+          if (content) {
+            if (sourceRoot) {
+              sourceFile = util.relative(sourceRoot, sourceFile);
+            }
+            this.setSourceContent(sourceFile, content);
+          }
+        }, this);
+      };
+      SourceMapGenerator.prototype._validateMapping = function SourceMapGenerator_validateMapping(aGenerated, aOriginal, aSource, aName) {
+        if (aGenerated && 'line' in aGenerated && 'column' in aGenerated && aGenerated.line > 0 && aGenerated.column >= 0 && !aOriginal && !aSource && !aName) {
+          return;
+        } 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) {
+          return;
+        } else {
+          throw new Error('Invalid mapping.');
+        }
+      };
+      function cmpLocation(loc1, loc2) {
+        var cmp = (loc1 && loc1.line) - (loc2 && loc2.line);
+        return cmp ? cmp : (loc1 && loc1.column) - (loc2 && loc2.column);
+      }
+      function strcmp(str1, str2) {
+        str1 = str1 || '';
+        str2 = str2 || '';
+        return (str1 > str2) - (str1 < str2);
+      }
+      function cmpMapping(mappingA, mappingB) {
+        return cmpLocation(mappingA.generated, mappingB.generated) || cmpLocation(mappingA.original, mappingB.original) || strcmp(mappingA.source, mappingB.source) || strcmp(mappingA.name, mappingB.name);
+      }
+      SourceMapGenerator.prototype._serializeMappings = function SourceMapGenerator_serializeMappings() {
+        var previousGeneratedColumn = 0;
+        var previousGeneratedLine = 1;
+        var previousOriginalColumn = 0;
+        var previousOriginalLine = 0;
+        var previousName = 0;
+        var previousSource = 0;
+        var result = '';
+        var mapping;
+        this._mappings.sort(cmpMapping);
+        for (var i = 0, len = this._mappings.length; i < len; i++) {
+          mapping = this._mappings[i];
+          if (mapping.generated.line !== previousGeneratedLine) {
+            previousGeneratedColumn = 0;
+            while (mapping.generated.line !== previousGeneratedLine) {
+              result += ';';
+              previousGeneratedLine++;
+            }
+          } else {
+            if (i > 0) {
+              if (!cmpMapping(mapping, this._mappings[i - 1])) {
+                continue;
+              }
+              result += ',';
+            }
+          }
+          result += base64VLQ.encode(mapping.generated.column - previousGeneratedColumn);
+          previousGeneratedColumn = mapping.generated.column;
+          if (mapping.source && mapping.original) {
+            result += base64VLQ.encode(this._sources.indexOf(mapping.source) - previousSource);
+            previousSource = this._sources.indexOf(mapping.source);
+            result += base64VLQ.encode(mapping.original.line - 1 - previousOriginalLine);
+            previousOriginalLine = mapping.original.line - 1;
+            result += base64VLQ.encode(mapping.original.column - previousOriginalColumn);
+            previousOriginalColumn = mapping.original.column;
+            if (mapping.name) {
+              result += base64VLQ.encode(this._names.indexOf(mapping.name) - previousName);
+              previousName = this._names.indexOf(mapping.name);
+            }
+          }
+        }
+        return result;
+      };
+      SourceMapGenerator.prototype.toJSON = function SourceMapGenerator_toJSON() {
+        var map = {
+            version: this._version,
+            file: this._file,
+            sources: this._sources.toArray(),
+            names: this._names.toArray(),
+            mappings: this._serializeMappings()
+          };
+        if (this._sourceRoot) {
+          map.sourceRoot = this._sourceRoot;
+        }
+        if (this._sourcesContents) {
+          map.sourcesContent = map.sources.map(function (source) {
+            if (map.sourceRoot) {
+              source = util.relative(map.sourceRoot, source);
+            }
+            return Object.prototype.hasOwnProperty.call(this._sourcesContents, util.toSetString(source)) ? this._sourcesContents[util.toSetString(source)] : null;
+          }, this);
+        }
+        return map;
+      };
+      SourceMapGenerator.prototype.toString = function SourceMapGenerator_toString() {
+        return JSON.stringify(this);
+      };
+      exports.SourceMapGenerator = SourceMapGenerator;
+    });
+  });
+  require.define('/node_modules/source-map/lib/source-map/array-set.js', function (module, exports, __dirname, __filename) {
+    if (typeof define !== 'function') {
+      var define = require('/node_modules/source-map/node_modules/amdefine/amdefine.js', module)(module, require);
+    }
+    define(function (require, exports, module) {
+      var util = require('/node_modules/source-map/lib/source-map/util.js', module);
+      function ArraySet() {
+        this._array = [];
+        this._set = {};
+      }
+      ArraySet.fromArray = function ArraySet_fromArray(aArray, aAllowDuplicates) {
+        var set = new ArraySet;
+        for (var i = 0, len = aArray.length; i < len; i++) {
+          set.add(aArray[i], aAllowDuplicates);
+        }
+        return set;
+      };
+      ArraySet.prototype.add = function ArraySet_add(aStr, aAllowDuplicates) {
+        var isDuplicate = this.has(aStr);
+        var idx = this._array.length;
+        if (!isDuplicate || aAllowDuplicates) {
+          this._array.push(aStr);
+        }
+        if (!isDuplicate) {
+          this._set[util.toSetString(aStr)] = idx;
+        }
+      };
+      ArraySet.prototype.has = function ArraySet_has(aStr) {
+        return Object.prototype.hasOwnProperty.call(this._set, util.toSetString(aStr));
+      };
+      ArraySet.prototype.indexOf = function ArraySet_indexOf(aStr) {
+        if (this.has(aStr)) {
+          return this._set[util.toSetString(aStr)];
+        }
+        throw new Error('"' + aStr + '" is not in the set.');
+      };
+      ArraySet.prototype.at = function ArraySet_at(aIdx) {
+        if (aIdx >= 0 && aIdx < this._array.length) {
+          return this._array[aIdx];
+        }
+        throw new Error('No element indexed by ' + aIdx);
+      };
+      ArraySet.prototype.toArray = function ArraySet_toArray() {
+        return this._array.slice();
+      };
+      exports.ArraySet = ArraySet;
+    });
+  });
+  require.define('/node_modules/source-map/lib/source-map/base64-vlq.js', function (module, exports, __dirname, __filename) {
+    if (typeof define !== 'function') {
+      var define = require('/node_modules/source-map/node_modules/amdefine/amdefine.js', module)(module, require);
+    }
+    define(function (require, exports, module) {
+      var base64 = require('/node_modules/source-map/lib/source-map/base64.js', module);
+      var VLQ_BASE_SHIFT = 5;
+      var VLQ_BASE = 1 << VLQ_BASE_SHIFT;
+      var VLQ_BASE_MASK = VLQ_BASE - 1;
+      var VLQ_CONTINUATION_BIT = VLQ_BASE;
+      function toVLQSigned(aValue) {
+        return aValue < 0 ? (-aValue << 1) + 1 : (aValue << 1) + 0;
+      }
+      function fromVLQSigned(aValue) {
+        var isNegative = (aValue & 1) === 1;
+        var shifted = aValue >> 1;
+        return isNegative ? -shifted : shifted;
+      }
+      exports.encode = function base64VLQ_encode(aValue) {
+        var encoded = '';
+        var digit;
+        var vlq = toVLQSigned(aValue);
+        do {
+          digit = vlq & VLQ_BASE_MASK;
+          vlq >>>= VLQ_BASE_SHIFT;
+          if (vlq > 0) {
+            digit |= VLQ_CONTINUATION_BIT;
+          }
+          encoded += base64.encode(digit);
+        } while (vlq > 0);
+        return encoded;
+      };
+      exports.decode = function base64VLQ_decode(aStr) {
+        var i = 0;
+        var strLen = aStr.length;
+        var result = 0;
+        var shift = 0;
+        var continuation, digit;
+        do {
+          if (i >= strLen) {
+            throw new Error('Expected more digits in base 64 VLQ value.');
+          }
+          digit = base64.decode(aStr.charAt(i++));
+          continuation = !!(digit & VLQ_CONTINUATION_BIT);
+          digit &= VLQ_BASE_MASK;
+          result = result + (digit << shift);
+          shift += VLQ_BASE_SHIFT;
+        } while (continuation);
+        return {
+          value: fromVLQSigned(result),
+          rest: aStr.slice(i)
+        };
+      };
+    });
+  });
+  require.define('/node_modules/source-map/lib/source-map/base64.js', function (module, exports, __dirname, __filename) {
+    if (typeof define !== 'function') {
+      var define = require('/node_modules/source-map/node_modules/amdefine/amdefine.js', module)(module, require);
+    }
+    define(function (require, exports, module) {
+      var charToIntMap = {};
+      var intToCharMap = {};
+      'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'.split('').forEach(function (ch, index) {
+        charToIntMap[ch] = index;
+        intToCharMap[index] = ch;
+      });
+      exports.encode = function base64_encode(aNumber) {
+        if (aNumber in intToCharMap) {
+          return intToCharMap[aNumber];
+        }
+        throw new TypeError('Must be between 0 and 63: ' + aNumber);
+      };
+      exports.decode = function base64_decode(aChar) {
+        if (aChar in charToIntMap) {
+          return charToIntMap[aChar];
+        }
+        throw new TypeError('Not a valid base 64 digit: ' + aChar);
+      };
+    });
+  });
+  require.define('/node_modules/source-map/lib/source-map/source-map-consumer.js', function (module, exports, __dirname, __filename) {
+    if (typeof define !== 'function') {
+      var define = require('/node_modules/source-map/node_modules/amdefine/amdefine.js', module)(module, require);
+    }
+    define(function (require, exports, module) {
+      var util = require('/node_modules/source-map/lib/source-map/util.js', module);
+      var binarySearch = require('/node_modules/source-map/lib/source-map/binary-search.js', module);
+      var ArraySet = require('/node_modules/source-map/lib/source-map/array-set.js', module).ArraySet;
+      var base64VLQ = require('/node_modules/source-map/lib/source-map/base64-vlq.js', module);
+      function SourceMapConsumer(aSourceMap) {
+        var sourceMap = aSourceMap;
+        if (typeof aSourceMap === 'string') {
+          sourceMap = JSON.parse(aSourceMap.replace(/^\)\]\}'/, ''));
+        }
+        var version = util.getArg(sourceMap, 'version');
+        var sources = util.getArg(sourceMap, 'sources');
+        var names = util.getArg(sourceMap, 'names');
+        var sourceRoot = util.getArg(sourceMap, 'sourceRoot', null);
+        var sourcesContent = util.getArg(sourceMap, 'sourcesContent', null);
+        var mappings = util.getArg(sourceMap, 'mappings');
+        var file = util.getArg(sourceMap, 'file', null);
+        if (version !== this._version) {
+          throw new Error('Unsupported version: ' + version);
+        }
+        this._names = ArraySet.fromArray(names, true);
+        this._sources = ArraySet.fromArray(sources, true);
+        this.sourceRoot = sourceRoot;
+        this.sourcesContent = sourcesContent;
+        this.file = file;
+        this._generatedMappings = [];
+        this._originalMappings = [];
+        this._parseMappings(mappings, sourceRoot);
+      }
+      SourceMapConsumer.prototype._version = 3;
+      Object.defineProperty(SourceMapConsumer.prototype, 'sources', {
+        get: function () {
+          return this._sources.toArray().map(function (s) {
+            return this.sourceRoot ? util.join(this.sourceRoot, s) : s;
+          }, this);
+        }
+      });
+      SourceMapConsumer.prototype._parseMappings = function SourceMapConsumer_parseMappings(aStr, aSourceRoot) {
+        var generatedLine = 1;
+        var previousGeneratedColumn = 0;
+        var previousOriginalLine = 0;
+        var previousOriginalColumn = 0;
+        var previousSource = 0;
+        var previousName = 0;
+        var mappingSeparator = /^[,;]/;
+        var str = aStr;
+        var mapping;
+        var temp;
+        while (str.length > 0) {
+          if (str.charAt(0) === ';') {
+            generatedLine++;
+            str = str.slice(1);
+            previousGeneratedColumn = 0;
+          } else if (str.charAt(0) === ',') {
+            str = str.slice(1);
+          } else {
+            mapping = {};
+            mapping.generatedLine = generatedLine;
+            temp = base64VLQ.decode(str);
+            mapping.generatedColumn = previousGeneratedColumn + temp.value;
+            previousGeneratedColumn = mapping.generatedColumn;
+            str = temp.rest;
+            if (str.length > 0 && !mappingSeparator.test(str.charAt(0))) {
+              temp = base64VLQ.decode(str);
+              mapping.source = this._sources.at(previousSource + temp.value);
+              previousSource += temp.value;
+              str = temp.rest;
+              if (str.length === 0 || mappingSeparator.test(str.charAt(0))) {
+                throw new Error('Found a source, but no line and column');
+              }
+              temp = base64VLQ.decode(str);
+              mapping.originalLine = previousOriginalLine + temp.value;
+              previousOriginalLine = mapping.originalLine;
+              mapping.originalLine += 1;
+              str = temp.rest;
+              if (str.length === 0 || mappingSeparator.test(str.charAt(0))) {
+                throw new Error('Found a source and line, but no column');
+              }
+              temp = base64VLQ.decode(str);
+              mapping.originalColumn = previousOriginalColumn + temp.value;
+              previousOriginalColumn = mapping.originalColumn;
+              str = temp.rest;
+              if (str.length > 0 && !mappingSeparator.test(str.charAt(0))) {
+                temp = base64VLQ.decode(str);
+                mapping.name = this._names.at(previousName + temp.value);
+                previousName += temp.value;
+                str = temp.rest;
+              }
+            }
+            this._generatedMappings.push(mapping);
+            if (typeof mapping.originalLine === 'number') {
+              this._originalMappings.push(mapping);
+            }
+          }
+        }
+        this._originalMappings.sort(this._compareOriginalPositions);
+      };
+      SourceMapConsumer.prototype._compareOriginalPositions = function SourceMapConsumer_compareOriginalPositions(mappingA, mappingB) {
+        if (mappingA.source > mappingB.source) {
+          return 1;
+        } else if (mappingA.source < mappingB.source) {
+          return -1;
+        } else {
+          var cmp = mappingA.originalLine - mappingB.originalLine;
+          return cmp === 0 ? mappingA.originalColumn - mappingB.originalColumn : cmp;
+        }
+      };
+      SourceMapConsumer.prototype._compareGeneratedPositions = function SourceMapConsumer_compareGeneratedPositions(mappingA, mappingB) {
+        var cmp = mappingA.generatedLine - mappingB.generatedLine;
+        return cmp === 0 ? mappingA.generatedColumn - mappingB.generatedColumn : cmp;
+      };
+      SourceMapConsumer.prototype._findMapping = function SourceMapConsumer_findMapping(aNeedle, aMappings, aLineName, aColumnName, aComparator) {
+        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);
+      };
+      SourceMapConsumer.prototype.originalPositionFor = function SourceMapConsumer_originalPositionFor(aArgs) {
+        var needle = {
+            generatedLine: util.getArg(aArgs, 'line'),
+            generatedColumn: util.getArg(aArgs, 'column')
+          };
+        var mapping = this._findMapping(needle, this._generatedMappings, 'generatedLine', 'generatedColumn', this._compareGeneratedPositions);
+        if (mapping) {
+          var source = util.getArg(mapping, 'source', null);
+          if (source && this.sourceRoot) {
+            source = util.join(this.sourceRoot, source);
+          }
+          return {
+            source: source,
+            line: util.getArg(mapping, 'originalLine', null),
+            column: util.getArg(mapping, 'originalColumn', null),
+            name: util.getArg(mapping, 'name', null)
+          };
+        }
+        return {
+          source: null,
+          line: null,
+          column: null,
+          name: null
+        };
+      };
+      SourceMapConsumer.prototype.sourceContentFor = function SourceMapConsumer_sourceContentFor(aSource) {
+        if (!this.sourcesContent) {
+          return null;
+        }
+        if (this.sourceRoot) {
+          aSource = util.relative(this.sourceRoot, aSource);
+        }
+        if (this._sources.has(aSource)) {
+          return this.sourcesContent[this._sources.indexOf(aSource)];
+        }
+        var url;
+        if (this.sourceRoot && (url = util.urlParse(this.sourceRoot))) {
+          var fileUriAbsPath = aSource.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('/' + aSource)) {
+            return this.sourcesContent[this._sources.indexOf('/' + aSource)];
+          }
+        }
+        throw new Error('"' + aSource + '" is not in the SourceMap.');
+      };
+      SourceMapConsumer.prototype.generatedPositionFor = function SourceMapConsumer_generatedPositionFor(aArgs) {
+        var needle = {
+            source: util.getArg(aArgs, 'source'),
+            originalLine: util.getArg(aArgs, 'line'),
+            originalColumn: util.getArg(aArgs, 'column')
+          };
+        if (this.sourceRoot) {
+          needle.source = util.relative(this.sourceRoot, needle.source);
+        }
+        var mapping = this._findMapping(needle, this._originalMappings, 'originalLine', 'originalColumn', this._compareOriginalPositions);
+        if (mapping) {
+          return {
+            line: util.getArg(mapping, 'generatedLine', null),
+            column: util.getArg(mapping, 'generatedColumn', null)
+          };
+        }
+        return {
+          line: null,
+          column: null
+        };
+      };
+      SourceMapConsumer.GENERATED_ORDER = 1;
+      SourceMapConsumer.ORIGINAL_ORDER = 2;
+      SourceMapConsumer.prototype.eachMapping = function SourceMapConsumer_eachMapping(aCallback, aContext, aOrder) {
+        var context = aContext || null;
+        var order = aOrder || SourceMapConsumer.GENERATED_ORDER;
+        var 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.');
+        }
+        var sourceRoot = this.sourceRoot;
+        mappings.map(function (mapping) {
+          var source = mapping.source;
+          if (source && sourceRoot) {
+            source = util.join(sourceRoot, source);
+          }
+          return {
+            source: source,
+            generatedLine: mapping.generatedLine,
+            generatedColumn: mapping.generatedColumn,
+            originalLine: mapping.originalLine,
+            originalColumn: mapping.originalColumn,
+            name: mapping.name
+          };
+        }).forEach(aCallback, context);
+      };
+      exports.SourceMapConsumer = SourceMapConsumer;
+    });
+  });
+  require.define('/node_modules/source-map/lib/source-map/binary-search.js', function (module, exports, __dirname, __filename) {
+    if (typeof define !== 'function') {
+      var define = require('/node_modules/source-map/node_modules/amdefine/amdefine.js', module)(module, require);
+    }
+    define(function (require, exports, module) {
+      function recursiveSearch(aLow, aHigh, aNeedle, aHaystack, aCompare) {
+        var mid = Math.floor((aHigh - aLow) / 2) + aLow;
+        var cmp = aCompare(aNeedle, aHaystack[mid]);
+        if (cmp === 0) {
+          return aHaystack[mid];
+        } else if (cmp > 0) {
+          if (aHigh - mid > 1) {
+            return recursiveSearch(mid, aHigh, aNeedle, aHaystack, aCompare);
+          }
+          return aHaystack[mid];
+        } else {
+          if (mid - aLow > 1) {
+            return recursiveSearch(aLow, mid, aNeedle, aHaystack, aCompare);
+          }
+          return aLow < 0 ? null : aHaystack[aLow];
+        }
+      }
+      exports.search = function search(aNeedle, aHaystack, aCompare) {
+        return aHaystack.length > 0 ? recursiveSearch(-1, aHaystack.length, aNeedle, aHaystack, aCompare) : null;
+      };
+    });
+  });
+  require.define('/node_modules/estraverse/estraverse.js', function (module, exports, __dirname, __filename) {
+    (function (root, factory) {
+      'use strict';
+      if (typeof define === 'function' && define.amd) {
+        define(['exports'], factory);
+      } else if (typeof exports !== 'undefined') {
+        factory(exports);
+      } else {
+        factory(root.estraverse = {});
+      }
+    }(this, function (exports) {
+      'use strict';
+      var Syntax, isArray, VisitorOption, VisitorKeys, BREAK, SKIP;
+      Syntax = {
+        AssignmentExpression: 'AssignmentExpression',
+        ArrayExpression: 'ArrayExpression',
+        ArrowFunctionExpression: 'ArrowFunctionExpression',
+        BlockStatement: 'BlockStatement',
+        BinaryExpression: 'BinaryExpression',
+        BreakStatement: 'BreakStatement',
+        CallExpression: 'CallExpression',
+        CatchClause: 'CatchClause',
+        ConditionalExpression: 'ConditionalExpression',
+        ContinueStatement: 'ContinueStatement',
+        DebuggerStatement: 'DebuggerStatement',
+        DirectiveStatement: 'DirectiveStatement',
+        DoWhileStatement: 'DoWhileStatement',
+        EmptyStatement: 'EmptyStatement',
+        ExpressionStatement: 'ExpressionStatement',
+        ForStatement: 'ForStatement',
+        ForInStatement: 'ForInStatement',
+        FunctionDeclaration: 'FunctionDeclaration',
+        FunctionExpression: 'FunctionExpression',
+        Identifier: 'Identifier',
+        IfStatement: 'IfStatement',
+        Literal: 'Literal',
+        LabeledStatement: 'LabeledStatement',
+        LogicalExpression: 'LogicalExpression',
+        MemberExpression: 'MemberExpression',
+        NewExpression: 'NewExpression',
+        ObjectExpression: 'ObjectExpression',
+        Program: 'Program',
+        Property: 'Property',
+        ReturnStatement: 'ReturnStatement',
+        SequenceExpression: 'SequenceExpression',
+        SwitchStatement: 'SwitchStatement',
+        SwitchCase: 'SwitchCase',
+        ThisExpression: 'ThisExpression',
+        ThrowStatement: 'ThrowStatement',
+        TryStatement: 'TryStatement',
+        UnaryExpression: 'UnaryExpression',
+        UpdateExpression: 'UpdateExpression',
+        VariableDeclaration: 'VariableDeclaration',
+        VariableDeclarator: 'VariableDeclarator',
+        WhileStatement: 'WhileStatement',
+        WithStatement: 'WithStatement',
+        YieldExpression: 'YieldExpression'
+      };
+      function ignoreJSHintError() {
+      }
+      isArray = Array.isArray;
+      if (!isArray) {
+        isArray = function isArray(array) {
+          return Object.prototype.toString.call(array) === '[object Array]';
+        };
+      }
+      function deepCopy(obj) {
+        var ret = {}, key, val;
+        for (key in obj) {
+          if (obj.hasOwnProperty(key)) {
+            val = obj[key];
+            if (typeof val === 'object' && val !== null) {
+              ret[key] = deepCopy(val);
+            } else {
+              ret[key] = val;
+            }
+          }
+        }
+        return ret;
+      }
+      function shallowCopy(obj) {
+        var ret = {}, key;
+        for (key in obj) {
+          if (obj.hasOwnProperty(key)) {
+            ret[key] = obj[key];
+          }
+        }
+        return ret;
+      }
+      ignoreJSHintError(shallowCopy);
+      function upperBound(array, func) {
+        var diff, len, i, current;
+        len = array.length;
+        i = 0;
+        while (len) {
+          diff = len >>> 1;
+          current = i + diff;
+          if (func(array[current])) {
+            len = diff;
+          } else {
+            i = current + 1;
+            len -= diff + 1;
+          }
+        }
+        return i;
+      }
+      function lowerBound(array, func) {
+        var diff, len, i, current;
+        len = array.length;
+        i = 0;
+        while (len) {
+          diff = len >>> 1;
+          current = i + diff;
+          if (func(array[current])) {
+            i = current + 1;
+            len -= diff + 1;
+          } else {
+            len = diff;
+          }
+        }
+        return i;
+      }
+      ignoreJSHintError(lowerBound);
+      VisitorKeys = {
+        AssignmentExpression: [
+          'left',
+          'right'
+        ],
+        ArrayExpression: ['elements'],
+        ArrowFunctionExpression: [
+          'params',
+          'body'
+        ],
+        BlockStatement: ['body'],
+        BinaryExpression: [
+          'left',
+          'right'
+        ],
+        BreakStatement: ['label'],
+        CallExpression: [
+          'callee',
+          'arguments'
+        ],
+        CatchClause: [
+          'param',
+          'body'
+        ],
+        ConditionalExpression: [
+          'test',
+          'consequent',
+          'alternate'
+        ],
+        ContinueStatement: ['label'],
+        DebuggerStatement: [],
+        DirectiveStatement: [],
+        DoWhileStatement: [
+          'body',
+          'test'
+        ],
+        EmptyStatement: [],
+        ExpressionStatement: ['expression'],
+        ForStatement: [
+          'init',
+          'test',
+          'update',
+          'body'
+        ],
+        ForInStatement: [
+          'left',
+          'right',
+          'body'
+        ],
+        FunctionDeclaration: [
+          'id',
+          'params',
+          'body'
+        ],
+        FunctionExpression: [
+          'id',
+          'params',
+          'body'
+        ],
+        Identifier: [],
+        IfStatement: [
+          'test',
+          'consequent',
+          'alternate'
+        ],
+        Literal: [],
+        LabeledStatement: [
+          'label',
+          'body'
+        ],
+        LogicalExpression: [
+          'left',
+          'right'
+        ],
+        MemberExpression: [
+          'object',
+          'property'
+        ],
+        NewExpression: [
+          'callee',
+          'arguments'
+        ],
+        ObjectExpression: ['properties'],
+        Program: ['body'],
+        Property: [
+          'key',
+          'value'
+        ],
+        ReturnStatement: ['argument'],
+        SequenceExpression: ['expressions'],
+        SwitchStatement: [
+          'discriminant',
+          'cases'
+        ],
+        SwitchCase: [
+          'test',
+          'consequent'
+        ],
+        ThisExpression: [],
+        ThrowStatement: ['argument'],
+        TryStatement: [
+          'block',
+          'handlers',
+          'handler',
+          'guardedHandlers',
+          'finalizer'
+        ],
+        UnaryExpression: ['argument'],
+        UpdateExpression: ['argument'],
+        VariableDeclaration: ['declarations'],
+        VariableDeclarator: [
+          'id',
+          'init'
+        ],
+        WhileStatement: [
+          'test',
+          'body'
+        ],
+        WithStatement: [
+          'object',
+          'body'
+        ],
+        YieldExpression: ['argument']
+      };
+      BREAK = {};
+      SKIP = {};
+      VisitorOption = {
+        Break: BREAK,
+        Skip: SKIP
+      };
+      function Reference(parent, key) {
+        this.parent = parent;
+        this.key = key;
+      }
+      Reference.prototype.replace = function replace(node) {
+        this.parent[this.key] = node;
+      };
+      function Element(node, path, wrap, ref) {
+        this.node = node;
+        this.path = path;
+        this.wrap = wrap;
+        this.ref = ref;
+      }
+      function Controller() {
+      }
+      Controller.prototype.path = function path() {
+        var i, iz, j, jz, result, element;
+        function addToPath(result, path) {
+          if (isArray(path)) {
+            for (j = 0, jz = path.length; j < jz; ++j) {
+              result.push(path[j]);
+            }
+          } else {
+            result.push(path);
+          }
+        }
+        if (!this.__current.path) {
+          return null;
+        }
+        result = [];
+        for (i = 2, iz = this.__leavelist.length; i < iz; ++i) {
+          element = this.__leavelist[i];
+          addToPath(result, element.path);
+        }
+        addToPath(result, this.__current.path);
+        return result;
+      };
+      Controller.prototype.parents = function parents() {
+        var i, iz, result;
+        result = [];
+        for (i = 1, iz = this.__leavelist.length; i < iz; ++i) {
+          result.push(this.__leavelist[i].node);
+        }
+        return result;
+      };
+      Controller.prototype.current = function current() {
+        return this.__current.node;
+      };
+      Controller.prototype.__execute = function __execute(callback, element) {
+        var previous, result;
+        result = undefined;
+        previous = this.__current;
+        this.__current = element;
+        this.__state = null;
+        if (callback) {
+          result = callback.call(this, element.node, this.__leavelist[this.__leavelist.length - 1].node);
+        }
+        this.__current = previous;
+        return result;
+      };
+      Controller.prototype.notify = function notify(flag) {
+        this.__state = flag;
+      };
+      Controller.prototype.skip = function () {
+        this.notify(SKIP);
+      };
+      Controller.prototype['break'] = function () {
+        this.notify(BREAK);
+      };
+      Controller.prototype.__initialize = function (root, visitor) {
+        this.visitor = visitor;
+        this.root = root;
+        this.__worklist = [];
+        this.__leavelist = [];
+        this.__current = null;
+        this.__state = null;
+      };
+      Controller.prototype.traverse = function traverse(root, visitor) {
+        var worklist, leavelist, element, node, nodeType, ret, key, current, current2, candidates, candidate, sentinel;
+        this.__initialize(root, visitor);
+        sentinel = {};
+        worklist = this.__worklist;
+        leavelist = this.__leavelist;
+        worklist.push(new Element(root, null, null, null));
+        leavelist.push(new Element(null, null, null, null));
+        while (worklist.length) {
+          element = worklist.pop();
+          if (element === sentinel) {
+            element = leavelist.pop();
+            ret = this.__execute(visitor.leave, element);
+            if (this.__state === BREAK || ret === BREAK) {
+              return;
+            }
+            continue;
+          }
+          if (element.node) {
+            ret = this.__execute(visitor.enter, element);
+            if (this.__state === BREAK || ret === BREAK) {
+              return;
+            }
+            worklist.push(sentinel);
+            leavelist.push(element);
+            if (this.__state === SKIP || ret === SKIP) {
+              continue;
+            }
+            node = element.node;
+            nodeType = element.wrap || node.type;
+            candidates = VisitorKeys[nodeType];
+            current = candidates.length;
+            while ((current -= 1) >= 0) {
+              key = candidates[current];
+              candidate = node[key];
+              if (!candidate) {
+                continue;
+              }
+              if (!isArray(candidate)) {
+                worklist.push(new Element(candidate, key, null, null));
+                continue;
+              }
+              current2 = candidate.length;
+              while ((current2 -= 1) >= 0) {
+                if (!candidate[current2]) {
+                  continue;
+                }
+                if (nodeType === Syntax.ObjectExpression && 'properties' === candidates[current]) {
+                  element = new Element(candidate[current2], [
+                    key,
+                    current2
+                  ], 'Property', null);
+                } else {
+                  element = new Element(candidate[current2], [
+                    key,
+                    current2
+                  ], null, null);
+                }
+                worklist.push(element);
+              }
+            }
+          }
+        }
+      };
+      Controller.prototype.replace = function replace(root, visitor) {
+        var worklist, leavelist, node, nodeType, target, element, current, current2, candidates, candidate, sentinel, outer, key;
+        this.__initialize(root, visitor);
+        sentinel = {};
+        worklist = this.__worklist;
+        leavelist = this.__leavelist;
+        outer = { root: root };
+        element = new Element(root, null, null, new Reference(outer, 'root'));
+        worklist.push(element);
+        leavelist.push(element);
+        while (worklist.length) {
+          element = worklist.pop();
+          if (element === sentinel) {
+            element = leavelist.pop();
+            target = this.__execute(visitor.leave, element);
+            if (target !== undefined && target !== BREAK && target !== SKIP) {
+              element.ref.replace(target);
+            }
+            if (this.__state === BREAK || target === BREAK) {
+              return outer.root;
+            }
+            continue;
+          }
+          target = this.__execute(visitor.enter, element);
+          if (target !== undefined && target !== BREAK && target !== SKIP) {
+            element.ref.replace(target);
+            element.node = target;
+          }
+          if (this.__state === BREAK || target === BREAK) {
+            return outer.root;
+          }
+          node = element.node;
+          if (!node) {
+            continue;
+          }
+          worklist.push(sentinel);
+          leavelist.push(element);
+          if (this.__state === SKIP || target === SKIP) {
+            continue;
+          }
+          nodeType = element.wrap || node.type;
+          candidates = VisitorKeys[nodeType];
+          current = candidates.length;
+          while ((current -= 1) >= 0) {
+            key = candidates[current];
+            candidate = node[key];
+            if (!candidate) {
+              continue;
+            }
+            if (!isArray(candidate)) {
+              worklist.push(new Element(candidate, key, null, new Reference(node, key)));
+              continue;
+            }
+            current2 = candidate.length;
+            while ((current2 -= 1) >= 0) {
+              if (!candidate[current2]) {
+                continue;
+              }
+              if (nodeType === Syntax.ObjectExpression && 'properties' === candidates[current]) {
+                element = new Element(candidate[current2], [
+                  key,
+                  current2
+                ], 'Property', new Reference(candidate, current2));
+              } else {
+                element = new Element(candidate[current2], [
+                  key,
+                  current2
+                ], null, new Reference(candidate, current2));
+              }
+              worklist.push(element);
+            }
+          }
+        }
+        return outer.root;
+      };
+      function traverse(root, visitor) {
+        var controller = new Controller;
+        return controller.traverse(root, visitor);
+      }
+      function replace(root, visitor) {
+        var controller = new Controller;
+        return controller.replace(root, visitor);
+      }
+      function extendCommentRange(comment, tokens) {
+        var target, token;
+        target = upperBound(tokens, function search(token) {
+          return token.range[0] > comment.range[0];
+        });
+        comment.extendedRange = [
+          comment.range[0],
+          comment.range[1]
+        ];
+        if (target !== tokens.length) {
+          comment.extendedRange[1] = tokens[target].range[0];
+        }
+        target -= 1;
+        if (target >= 0) {
+          if (target < tokens.length) {
+            comment.extendedRange[0] = tokens[target].range[1];
+          } else if (token.length) {
+            comment.extendedRange[1] = tokens[tokens.length - 1].range[0];
+          }
+        }
+        return comment;
+      }
+      function attachComments(tree, providedComments, tokens) {
+        var comments = [], comment, len, i, cursor;
+        if (!tree.range) {
+          throw new Error('attachComments needs range information');
+        }
+        if (!tokens.length) {
+          if (providedComments.length) {
+            for (i = 0, len = providedComments.length; i < len; i += 1) {
+              comment = deepCopy(providedComments[i]);
+              comment.extendedRange = [
+                0,
+                tree.range[0]
+              ];
+              comments.push(comment);
+            }
+            tree.leadingComments = comments;
+          }
+          return tree;
+        }
+        for (i = 0, len = providedComments.length; i < len; i += 1) {
+          comments.push(extendCommentRange(deepCopy(providedComments[i]), tokens));
+        }
+        cursor = 0;
+        traverse(tree, {
+          enter: function (node) {
+            var comment;
+            while (cursor < comments.length) {
+              comment = comments[cursor];
+              if (comment.extendedRange[1] > node.range[0]) {
+                break;
+              }
+              if (comment.extendedRange[1] === node.range[0]) {
+                if (!node.leadingComments) {
+                  node.leadingComments = [];
+                }
+                node.leadingComments.push(comment);
+                comments.splice(cursor, 1);
+              } else {
+                cursor += 1;
+              }
+            }
+            if (cursor === comments.length) {
+              return VisitorOption.Break;
+            }
+            if (comments[cursor].extendedRange[0] > node.range[1]) {
+              return VisitorOption.Skip;
+            }
+          }
+        });
+        cursor = 0;
+        traverse(tree, {
+          leave: function (node) {
+            var comment;
+            while (cursor < comments.length) {
+              comment = comments[cursor];
+              if (node.range[1] < comment.extendedRange[0]) {
+                break;
+              }
+              if (node.range[1] === comment.extendedRange[0]) {
+                if (!node.trailingComments) {
+                  node.trailingComments = [];
+                }
+                node.trailingComments.push(comment);
+                comments.splice(cursor, 1);
+              } else {
+                cursor += 1;
+              }
+            }
+            if (cursor === comments.length) {
+              return VisitorOption.Break;
+            }
+            if (comments[cursor].extendedRange[0] > node.range[1]) {
+              return VisitorOption.Skip;
+            }
+          }
+        });
+        return tree;
+      }
+      exports.version = '1.3.1';
+      exports.Syntax = Syntax;
+      exports.traverse = traverse;
+      exports.replace = replace;
+      exports.attachComments = attachComments;
+      exports.VisitorKeys = VisitorKeys;
+      exports.VisitorOption = VisitorOption;
+      exports.Controller = Controller;
+    }));
+  });
+  require('/tools/entry-point.js');
+}.call(this, this));
--- a/toolkit/devtools/escodegen/moz.build
+++ b/toolkit/devtools/escodegen/moz.build
@@ -5,11 +5,12 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 XPCSHELL_TESTS_MANIFESTS += ['tests/unit/xpcshell.ini']
 
 JS_MODULES_PATH = 'modules/devtools/escodegen'
 
 EXTRA_JS_MODULES += [
     'escodegen.js',
+    'escodegen.worker.js',
     'estraverse.js',
     'package.json.js',
 ]
new file mode 100644
--- /dev/null
+++ b/toolkit/devtools/server/actors/pretty-print-worker.js
@@ -0,0 +1,54 @@
+/* -*- Mode: javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; js-indent-level: 2; -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * This file is meant to be loaded as a ChromeWorker. It accepts messages which
+ * have data of the form:
+ *
+ *     { id, url, indent, ast }
+ *
+ * Where `id` is a unique ID to identify this request, `url` is the url of the
+ * source being pretty printed, `indent` is the number of spaces to indent the
+ * code by, and `ast` is the source's abstract syntax tree.
+ *
+ * On success, the worker responds with a message of the form:
+ *
+ *     { id, code, mappings }
+ *
+ * Where `id` is the same unique ID from the request, `code` is the pretty
+ * printed source text, and `mappings` is an array or source mappings from the
+ * pretty printed code to the AST's source locations.
+ *
+ * In the case of an error, the worker responds with a message of the form:
+ *
+ *     { error }
+ */
+
+importScripts("resource://gre/modules/devtools/escodegen/escodegen.worker.js");
+
+self.onmessage = ({ data: { id, url, indent, ast } }) => {
+  try {
+    const prettified = escodegen.generate(ast, {
+      format: {
+        indent: {
+          style: " ".repeat(indent)
+        }
+      },
+      sourceMap: url,
+      sourceMapWithCode: true
+    });
+
+    self.postMessage({
+      id: id,
+      code: prettified.code,
+      mappings: prettified.map._mappings
+    });
+  } catch (e) {
+    self.postMessage({
+      error: e.message + "\n" + e.stack
+    });
+  }
+};
--- a/toolkit/devtools/server/actors/script.js
+++ b/toolkit/devtools/server/actors/script.js
@@ -463,16 +463,48 @@ ThreadActor.prototype = {
   get sources() {
     if (!this._sources) {
       this._sources = new ThreadSources(this, this._options.useSourceMaps,
                                         this._allowSource, this.onNewSource);
     }
     return this._sources;
   },
 
+  _prettyPrintWorker: null,
+  get prettyPrintWorker() {
+    if (!this._prettyPrintWorker) {
+      this._prettyPrintWorker = new ChromeWorker(
+        "resource://gre/modules/devtools/server/actors/pretty-print-worker.js");
+
+      this._prettyPrintWorker.addEventListener(
+        "error", this._onPrettyPrintError, false);
+
+      if (wantLogging) {
+        this._prettyPrintWorker.addEventListener("message", this._onPrettyPrintMsg, false);
+
+        const postMsg = this._prettyPrintWorker.postMessage;
+        this._prettyPrintWorker.postMessage = data => {
+          dumpn("Sending message to prettyPrintWorker: "
+                + JSON.stringify(data, null, 2) + "\n");
+          return postMsg.call(this._prettyPrintWorker, data);
+        };
+      }
+    }
+    return this._prettyPrintWorker;
+  },
+
+  _onPrettyPrintError: function (error) {
+    reportError(new Error(error));
+  },
+
+  _onPrettyPrintMsg: function ({ data }) {
+    dumpn("Received message from prettyPrintWorker: "
+          + JSON.stringify(data, null, 2) + "\n");
+  },
+
   /**
    * Keep track of all of the nested event loops we use to pause the debuggee
    * when we hit a breakpoint/debugger statement/etc in one place so we can
    * resolve them when we get resume packets. We have more than one (and keep
    * them in a stack) because we can pause within client evals.
    */
   _threadPauseEventLoops: null,
   _pushThreadPause: function TA__pushThreadPause() {
@@ -594,16 +626,25 @@ ThreadActor.prototype = {
     if (this._state == "paused") {
       this.onResume();
     }
 
     this._state = "exited";
 
     this.clearDebuggees();
 
+    if (this._prettyPrintWorker) {
+      this._prettyPrintWorker.removeEventListener(
+        "error", this._onPrettyPrintError, false);
+      this._prettyPrintWorker.removeEventListener(
+        "message", this._onPrettyPrintMsg, false);
+      this._prettyPrintWorker.terminate();
+      this._prettyPrintWorker = null;
+    }
+
     if (!this.dbg) {
       return;
     }
     this.dbg.enabled = false;
     this.dbg = null;
   },
 
   /**
@@ -2332,16 +2373,20 @@ function SourceActor({ url, thread, sour
 
 SourceActor.prototype = {
   constructor: SourceActor,
   actorPrefix: "source",
 
   get threadActor() this._threadActor,
   get url() this._url,
 
+  get prettyPrintWorker() {
+    return this.threadActor.prettyPrintWorker;
+  },
+
   form: function SA_form() {
     return {
       actor: this.actorID,
       url: this._url,
       isBlackBoxed: this.threadActor.sources.isBlackBoxed(this.url)
       // TODO bug 637572: introductionScript
     };
   },
@@ -2398,17 +2443,17 @@ SourceActor.prototype = {
   },
 
   /**
    * Handler for the "prettyPrint" packet.
    */
   onPrettyPrint: function ({ indent }) {
     return this._getSourceText()
       .then(this._parseAST)
-      .then(this._generatePrettyCodeAndMap(indent))
+      .then(this._sendToPrettyPrintWorker(indent))
       .then(this._invertSourceMap)
       .then(this._saveMap)
       .then(this.onSource)
       .then(null, error => ({
         from: this.actorID,
         error: "prettyPrintError",
         message: DevToolsUtils.safeErrorString(error)
       }));
@@ -2417,72 +2462,114 @@ SourceActor.prototype = {
   /**
    * Parse the source content into an AST.
    */
   _parseAST: function SA__parseAST({ content}) {
     return Reflect.parse(content);
   },
 
   /**
-   * Take the number of spaces to indent and return a function that takes an AST
-   * and generates code and a source map from the ugly code to the pretty code.
+   * Return a function that sends a request to the pretty print worker, waits on
+   * the worker's response, and then returns the pretty printed code.
+   *
+   * @param Number aIndent
+   *        The number of spaces to indent by the code by, when we send the
+   *        request to the pretty print worker.
+   * @returns Function
+   *          Returns a function which takes an AST, and returns a promise that
+   *          is resolved with `{ code, mappings }` where `code` is the pretty
+   *          printed code, and `mappings` is an array of source mappings.
    */
-  _generatePrettyCodeAndMap: function SA__generatePrettyCodeAndMap(aNumSpaces) {
-    let indent = "";
-    for (let i = 0; i < aNumSpaces; i++) {
-      indent += " ";
-    }
-    return aAST => escodegen.generate(aAST, {
-      format: {
-        indent: {
-          style: indent
+  _sendToPrettyPrintWorker: function SA__sendToPrettyPrintWorker(aIndent) {
+    return aAST => {
+      const deferred = promise.defer();
+      const id = Math.random();
+
+      const onReply = ({ data }) => {
+        if (data.id !== id) {
+          return;
         }
-      },
-      sourceMap: this._url,
-      sourceMapWithCode: true
-    });
+        this.prettyPrintWorker.removeEventListener("message", onReply, false);
+
+        if (data.error) {
+          deferred.reject(new Error(data.error));
+        } else {
+          deferred.resolve(data);
+        }
+      };
+
+      this.prettyPrintWorker.addEventListener("message", onReply, false);
+      this.prettyPrintWorker.postMessage({
+        id: id,
+        url: this._url,
+        indent: aIndent,
+        ast: aAST
+      });
+
+      return deferred.promise;
+    };
   },
 
   /**
    * Invert a source map. So if a source map maps from a to b, return a new
    * source map from b to a. We need to do this because the source map we get
    * from _generatePrettyCodeAndMap goes the opposite way we want it to for
    * debugging.
    *
    * Note that the source map is modified in place.
    */
-  _invertSourceMap: function SA__invertSourceMap({ code, map }) {
-    // XXX bug 918802: Monkey punch the source map consumer, because iterating
-    // over all mappings and inverting each of them, and then creating a new
-    // SourceMapConsumer is *way* too slow.
-
-    map.setSourceContent(this._url, code);
-    const consumer = new SourceMapConsumer.fromSourceMap(map);
-    const getOrigPos = consumer.originalPositionFor.bind(consumer);
-    const getGenPos = consumer.generatedPositionFor.bind(consumer);
-
-    consumer.originalPositionFor = ({ line, column }) => {
-      const location = getGenPos({
+  _invertSourceMap: function SA__invertSourceMap({ code, mappings }) {
+    const generator = new SourceMapGenerator({ file: this._url });
+    return DevToolsUtils.yieldingEach(mappings, m => {
+      let mapping = {
+        generated: {
+          line: m.generatedLine,
+          column: m.generatedColumn
+        }
+      };
+      if (m.source) {
+        mapping.source = m.source;
+        mapping.original = {
+          line: m.originalLine,
+          column: m.originalColumn
+        };
+        mapping.name = m.name;
+      }
+      generator.addMapping(mapping);
+    }).then(() => {
+      generator.setSourceContent(this._url, code);
+      const consumer = SourceMapConsumer.fromSourceMap(generator);
+
+      // XXX bug 918802: Monkey punch the source map consumer, because iterating
+      // over all mappings and inverting each of them, and then creating a new
+      // SourceMapConsumer is slow.
+
+      const getOrigPos = consumer.originalPositionFor.bind(consumer);
+      const getGenPos = consumer.generatedPositionFor.bind(consumer);
+
+      consumer.originalPositionFor = ({ line, column }) => {
+        const location = getGenPos({
+          line: line,
+          column: column,
+          source: this._url
+        });
+        location.source = this._url;
+        return location;
+      };
+
+      consumer.generatedPositionFor = ({ line, column }) => getOrigPos({
         line: line,
-        column: column,
-        source: this._url
+        column: column
       });
-      location.source = this._url;
-      return location;
-    };
-
-    consumer.generatedPositionFor = ({ line, column }) => getOrigPos({
-      line: line,
-      column: column
+
+      return {
+        code: code,
+        map: consumer
+      };
     });
-
-    return {
-      code: code,
-      map: consumer
-    };
   },
 
   /**
    * Save the source map back to our thread's ThreadSources object so that
    * stepping, breakpoints, debugger statements, etc can use it. If we are
    * pretty printing a source mapped source, we need to compose the existing
    * source map with our new one.
    */
--- a/toolkit/devtools/server/dbg-server.jsm
+++ b/toolkit/devtools/server/dbg-server.jsm
@@ -32,13 +32,14 @@ var loadSubScript =
   "  }\n" +
   "}";
 
 // Load the debugging server in a sandbox with its own compartment.
 var systemPrincipal = Cc["@mozilla.org/systemprincipal;1"]
                       .createInstance(Ci.nsIPrincipal);
 
 var gGlobal = Cu.Sandbox(systemPrincipal);
+gGlobal.ChromeWorker = ChromeWorker;
 Cu.evalInSandbox(loadSubScript, gGlobal, "1.8");
 gGlobal.loadSubScript("resource://gre/modules/devtools/server/main.js");
 
 this.DebuggerServer = gGlobal.DebuggerServer;
 this.ActorPool = gGlobal.ActorPool;
deleted file mode 100644
--- a/toolkit/devtools/server/tests/unit/test_pretty_print-01.js
+++ /dev/null
@@ -1,42 +0,0 @@
-/* -*- Mode: javascript; js-indent-level: 2; -*- */
-/* Any copyright is dedicated to the Public Domain.
-   http://creativecommons.org/publicdomain/zero/1.0/ */
-
-var gDebuggee;
-var gClient;
-var gThreadClient;
-
-// Test basic pretty printing functionality
-
-function run_test() {
-  initTestDebuggerServer();
-  gDebuggee = addTestGlobal("test-pretty-print");
-  gClient = new DebuggerClient(DebuggerServer.connectPipe());
-  gClient.connect(function() {
-    attachTestTabAndResume(gClient, "test-pretty-print", function(aResponse, aTabClient, aThreadClient) {
-      gThreadClient = aThreadClient;
-      evalCode();
-    });
-  });
-  do_test_pending();
-}
-
-function evalCode() {
-  gClient.addOneTimeListener("newSource", prettyPrintSource);
-  const code = "" + function main() { let a = 1 + 3; let b = a++; return b + a; };
-  Cu.evalInSandbox(
-    code,
-    gDebuggee,
-    "1.8",
-    "data:text/javascript," + code);
-}
-
-function prettyPrintSource(event, { source }) {
-  gThreadClient.source(source).prettyPrint(4, testPrettyPrinted);
-}
-
-function testPrettyPrinted({ error, source}) {
-  do_check_true(!error);
-  do_check_true(source.contains("\n    "));
-  finishClient(gClient);
-}
deleted file mode 100644
--- a/toolkit/devtools/server/tests/unit/test_pretty_print-02.js
+++ /dev/null
@@ -1,94 +0,0 @@
-/* -*- Mode: javascript; js-indent-level: 2; -*- */
-/* Any copyright is dedicated to the Public Domain.
-   http://creativecommons.org/publicdomain/zero/1.0/ */
-
-var gDebuggee;
-var gClient;
-var gThreadClient;
-var gSource;
-
-// Test stepping through pretty printed sources.
-
-function run_test() {
-  initTestDebuggerServer();
-  gDebuggee = addTestGlobal("test-pretty-print");
-  gDebuggee.noop = x => x;
-  gClient = new DebuggerClient(DebuggerServer.connectPipe());
-  gClient.connect(function() {
-    attachTestTabAndResume(gClient, "test-pretty-print", function(aResponse, aTabClient, aThreadClient) {
-      gThreadClient = aThreadClient;
-      evalCode();
-    });
-  });
-  do_test_pending();
-}
-
-const CODE = "" + function main() { var a = 1; debugger; noop(a); return 10; };
-const CODE_URL = "data:text/javascript," + CODE;
-
-const BP_LOCATION = {
-  url: CODE_URL,
-  line: 5,
-  column: 2
-};
-
-function evalCode() {
-  gClient.addOneTimeListener("newSource", prettyPrintSource);
-  Cu.evalInSandbox(
-    CODE,
-    gDebuggee,
-    "1.8",
-    CODE_URL,
-    1
-  );
-}
-
-function prettyPrintSource(event, { source }) {
-  gSource = source;
-  gThreadClient.source(gSource).prettyPrint(2, runCode);
-}
-
-function runCode({ error }) {
-  do_check_true(!error);
-  gClient.addOneTimeListener("paused", testDbgStatement);
-  gDebuggee.main();
-}
-
-function testDbgStatement(event, { why, frame }) {
-  do_check_eq(why.type, "debuggerStatement");
-  const { url, line, column } = frame.where;
-  do_check_eq(url, CODE_URL);
-  do_check_eq(line, 3);
-  setBreakpoint();
-}
-
-function setBreakpoint() {
-  gThreadClient.setBreakpoint(BP_LOCATION, ({ error, actualLocation }) => {
-    do_check_true(!error);
-    do_check_true(!actualLocation);
-    testStepping();
-  });
-}
-
-function testStepping() {
-  gClient.addOneTimeListener("paused", (event, { why, frame }) => {
-    do_check_eq(why.type, "resumeLimit");
-    const { url, line } = frame.where;
-    do_check_eq(url, CODE_URL);
-    do_check_eq(line, 4);
-    testHitBreakpoint();
-  });
-  gThreadClient.stepIn();
-}
-
-function testHitBreakpoint() {
-  gClient.addOneTimeListener("paused", (event, { why, frame }) => {
-    do_check_eq(why.type, "breakpoint");
-    const { url, line, column } = frame.where;
-    do_check_eq(url, CODE_URL);
-    do_check_eq(line, BP_LOCATION.line);
-    do_check_eq(column, BP_LOCATION.column);
-    finishClient(gClient);
-  });
-  gThreadClient.resume();
-}
deleted file mode 100644
--- a/toolkit/devtools/server/tests/unit/test_pretty_print-03.js
+++ /dev/null
@@ -1,74 +0,0 @@
-/* -*- Mode: javascript; js-indent-level: 2; -*- */
-/* Any copyright is dedicated to the Public Domain.
-   http://creativecommons.org/publicdomain/zero/1.0/ */
-
-// Test pretty printing source mapped sources.
-
-var gDebuggee;
-var gClient;
-var gThreadClient;
-var gSource;
-
-Components.utils.import('resource:///modules/devtools/SourceMap.jsm');
-
-function run_test() {
-  initTestDebuggerServer();
-  gDebuggee = addTestGlobal("test-pretty-print");
-  gClient = new DebuggerClient(DebuggerServer.connectPipe());
-  gClient.connect(function() {
-    attachTestTabAndResume(gClient, "test-pretty-print", function(aResponse, aTabClient, aThreadClient) {
-      gThreadClient = aThreadClient;
-      evalCode();
-    });
-  });
-  do_test_pending();
-}
-
-const dataUrl = s => "data:text/javascript," + s;
-
-const A = "function a(){b()}";
-const A_URL = dataUrl(A);
-const B = "function b(){debugger}";
-const B_URL = dataUrl(B);
-
-function evalCode() {
-  let { code, map } = (new SourceNode(null, null, null, [
-    new SourceNode(1, 0, A_URL, A),
-    B.split("").map((ch, i) => new SourceNode(1, i, B_URL, ch))
-  ])).toStringWithSourceMap({
-    file: "abc.js"
-  });
-
-  code += "//# sourceMappingURL=data:text/json;base64," + btoa(map.toString());
-
-  gClient.addListener("newSource", waitForB);
-  Components.utils.evalInSandbox(code, gDebuggee, "1.8",
-                                 "http://example.com/foo.js", 1);
-}
-
-function waitForB(event, { source }) {
-  if (source.url !== B_URL) {
-    return;
-  }
-  gClient.removeListener("newSource", waitForB);
-  prettyPrint(source);
-}
-
-function prettyPrint(source) {
-  gThreadClient.source(source).prettyPrint(2, runCode);
-}
-
-function runCode({ error }) {
-  do_check_true(!error);
-  gClient.addOneTimeListener("paused", testDbgStatement);
-  gDebuggee.a();
-}
-
-function testDbgStatement(event, { frame, why }) {
-  do_check_eq(why.type, "debuggerStatement");
-  const { url, line, column } = frame.where;
-  do_check_eq(url, B_URL);
-  do_check_eq(line, 2);
-  do_check_eq(column, 2);
-  finishClient(gClient);
-}
--- a/toolkit/devtools/server/tests/unit/xpcshell.ini
+++ b/toolkit/devtools/server/tests/unit/xpcshell.ini
@@ -162,19 +162,16 @@ reason = bug 820380
 skip-if = toolkit == "gonk"
 reason = bug 820380
 [test_pause_exceptions-02.js]
 skip-if = toolkit == "gonk"
 reason = bug 820380
 [test_longstringactor.js]
 [test_longstringgrips-01.js]
 [test_longstringgrips-02.js]
-[test_pretty_print-01.js]
-[test_pretty_print-02.js]
-[test_pretty_print-03.js]
 [test_source-01.js]
 skip-if = toolkit == "gonk"
 reason = bug 820380
 [test_breakpointstore.js]
 [test_profiler_actor.js]
 [test_profiler_activation.js]
 skip-if = toolkit == "gonk"
 reason = bug 820380
--- a/toolkit/devtools/server/transport.js
+++ b/toolkit/devtools/server/transport.js
@@ -54,17 +54,17 @@ this.DebuggerTransport = function Debugg
   this._incoming = "";
 
   this.hooks = null;
 }
 
 DebuggerTransport.prototype = {
   /**
    * Transmit a packet.
-   * 
+   *
    * This method returns immediately, without waiting for the entire
    * packet to be transmitted, registering event handlers as needed to
    * transmit the entire packet. Packets are transmitted in the order
    * they are passed to this method.
    */
   send: function DT_send(aPacket) {
     // TODO (bug 709088): remove pretty printing when the protocol is done.
     let data = JSON.stringify(aPacket, null, 2);
--- a/toolkit/devtools/sourcemap/SourceMap.jsm
+++ b/toolkit/devtools/sourcemap/SourceMap.jsm
@@ -1253,17 +1253,22 @@ define('source-map/source-map-generator'
                && aOriginal && 'line' in aOriginal && 'column' in aOriginal
                && aGenerated.line > 0 && aGenerated.column >= 0
                && aOriginal.line > 0 && aOriginal.column >= 0
                && aSource) {
         // Cases 2 and 3.
         return;
       }
       else {
-        throw new Error('Invalid mapping.');
+        throw new Error('Invalid mapping: ' + JSON.stringify({
+          generated: aGenerated,
+          source: aSource,
+          orginal: aOriginal,
+          name: aName
+        }));
       }
     };
 
   /**
    * Serialize the accumulated mappings in to the stream of base 64 VLQs
    * specified by the source map format.
    */
   SourceMapGenerator.prototype._serializeMappings =
@@ -1330,16 +1335,19 @@ define('source-map/source-map-generator'
       }
 
       return result;
     };
 
   SourceMapGenerator.prototype._generateSourcesContent =
     function SourceMapGenerator_generateSourcesContent(aSources, aSourceRoot) {
       return aSources.map(function (source) {
+        if (!this._sourcesContents) {
+          return null;
+        }
         if (aSourceRoot) {
           source = util.relative(aSourceRoot, source);
         }
         var key = util.toSetString(source);
         return Object.prototype.hasOwnProperty.call(this._sourcesContents,
                                                     key)
           ? this._sourcesContents[key]
           : null;