[ios Mojo] Committed forked version of require.js.

ios/third_party/requirejs/require.js

+/** vim: et:ts=4:sw=4:sts=4
+ * @license RequireJS 2.2.0 Copyright jQuery Foundation and other contributors.
+ * Released under MIT license, http://github.com/requirejs/requirejs/LICENSE
+ */
+//Not using strict: uneven strict support in browsers, #392, and causes
+//problems with requirejs.exec()/transpiler plugins that may not be strict.
+/*jslint regexp: true, nomen: true, sloppy: true */
+/*global window, navigator, document, importScripts, setTimeout, opera */
+
+goog.provide('__crWeb.webUIRequire');
+
+goog.require('__crWeb.webUIModuleLoadNotifier');
+
+
+__crWeb.webUIModuleLoadNotifier = new WebUIModuleLoadNotifier();
+
+
+var requirejs, define;
+(function() {
+  var req, s,
+      commentRegExp = /(\/\*([\s\S]*?)\*\/|([^:]|^)\/\/(.*)$)/mg,
+      cjsRequireRegExp = /[^.]\s*require\s*\(\s*["']([^'"\s]+)["']\s*\)/g,
+      op = Object.prototype,
+      ostring = op.toString,
+      hasOwn = op.hasOwnProperty,
+      defContextName = '_',
+      contexts = {},
+      globalDefQueue = [];
+
+  // Could match something like ')//comment', do not lose the prefix to
+  // comment.
+  function commentReplace(match, multi, multiText, singlePrefix) {
+    return singlePrefix || '';
+  }
+
+  function isFunction(it) {
+    return ostring.call(it) === '[object Function]';
+  }
+
+  function isArray(it) {
+    return ostring.call(it) === '[object Array]';
+  }
+
+  /**
+   * Helper function for iterating over an array. If the func returns
+   * a true value, it will break out of the loop.
+   */
+  function each(ary, func) {
+    if (ary) {
+      var i;
+      for (i = 0; i < ary.length; i += 1) {
+        if (ary[i] && func(ary[i], i, ary)) {
+          break;
+        }
+      }
+    }
+  }
+
+  function hasProp(obj, prop) {
+    return hasOwn.call(obj, prop);
+  }
+
+  function getOwn(obj, prop) {
+    return hasProp(obj, prop) && obj[prop];
+  }
+
+  /**
+   * Cycles over properties in an object and calls a function for each
+   * property value. If the function returns a truthy value, then the
+   * iteration is stopped.
+   */
+  function eachProp(obj, func) {
+    var prop;
+    for (prop in obj) {
+      if (hasProp(obj, prop)) {
+        if (func(obj[prop], prop)) {
+          break;
+        }
+      }
+    }
+  }
+
+  // Similar to Function.prototype.bind, but the 'this' object is specified
+  // first, since it is easier to read/figure out what 'this' will be.
+  function bind(obj, fn) {
+    return function() {
+      return fn.apply(obj, arguments);
+    };
+  }
+
+  function defaultOnError(err) {
+    throw err;
+  }
+
+  /**
+   * Constructs an error with a pointer to an URL with more information.
+   * @param {String} id the error ID that maps to an ID on a web page.
+   * @param {String} message human readable error.
+   * @param {Error} [err] the original error, if there is one.
+   *
+   * @returns {Error}
+   */
+  function makeError(id, msg, err, requireModules) {
+    var e = new Error(msg + '\nhttp://requirejs.org/docs/errors.html#' + id);
+    e.requireType = id;
+    e.requireModules = requireModules;
+    if (err) {
+      e.originalError = err;
+    }
+    return e;
+  }
+
+  function newContext(contextName) {
+    var inCheckLoaded, Module, context, handlers,
+        checkLoadedTimeoutId,
+        config = {
+          // Defaults. Do not set a default for map
+          // config to speed up normalize(), which
+          // will run faster if there is no default.
+          waitSeconds: 7,
+          baseUrl: './'
+        },
+        registry = {},
+        // registry of just enabled modules, to speed
+        // cycle breaking code when lots of modules
+        // are registered, but not activated.
+        enabledRegistry = {},
+        defQueue = [],
+        defined = {},
+        urlFetched = {},
+        requireCounter = 1;
+
+    /**
+     * Creates a module mapping that includes, module name, and path.
+     *
+     * @param {String} name the module name
+     * @param {String} [parentModuleMap] parent module map
+     * for the module name, used to resolve relative names.
+     * This is true if this call is done for a define() module ID.
+     * @param {Boolean} applyMap: apply the map config to the ID.
+     * Should only be true if this map is for a dependency.
+     *
+     * @returns {Object}
+     */
+    function makeModuleMap(name, parentModuleMap, applyMap) {
+      var url,
+          parentName = parentModuleMap ? parentModuleMap.name : null,
+          isDefine = true;
+
+      // If no name, then it means it is a require call, generate an
+      // internal name.
+      if (!name) {
+        isDefine = false;
+        name = '_@r' + (requireCounter += 1);
+      }
+
+      // Account for relative paths if there is a base name.
+      url = context.nameToUrl(name);
+
+      return {
+        name: name,
+        parentMap: parentModuleMap,
+        url: url,
+        isDefine: isDefine,
+        id: name
+      };
+    }
+
+    function getModule(depMap) {
+      var id = depMap.id,
+          mod = getOwn(registry, id);
+
+      if (!mod) {
+        mod = registry[id] = new context.Module(depMap);
+      }
+
+      return mod;
+    }
+
+    function on(depMap, name, fn) {
+      var id = depMap.id,
+          mod = getOwn(registry, id);
+
+      if (hasProp(defined, id) && (!mod || mod.defineEmitComplete)) {
+        if (name === 'defined') {
+          fn(defined[id]);
+        }
+      } else {
+        mod = getModule(depMap);
+        if (mod.error && name === 'error') {
+          fn(mod.error);
+        } else {
+          mod.on(name, fn);
+        }
+      }
+    }
+
+    function onError(err, errback) {
+      var ids = err.requireModules,
+          notified = false;
+
+      if (errback) {
+        errback(err);
+      } else {
+        each(ids, function(id) {
+          var mod = getOwn(registry, id);
+          if (mod) {
+            // Set error on module, so it skips timeout checks.
+            mod.error = err;
+            if (mod.events.error) {
+              notified = true;
+              mod.emit('error', err);
+            }
+          }
+        });
+
+        if (!notified) {
+          req.onError(err);
+        }
+      }
+    }
+
+    /**
+     * Internal method to transfer globalQueue items to this context's
+     * defQueue.
+     */
+    function takeGlobalQueue() {
+      // Push all the globalDefQueue items into the context's defQueue
+      if (globalDefQueue.length) {
+        each(globalDefQueue, function(queueItem) {
+          var id = queueItem[0];
+          if (typeof id === 'string') {
+            context.defQueueMap[id] = true;
+          }
+          defQueue.push(queueItem);
+        });
+        globalDefQueue = [];
+      }
+    }
+
+    handlers = {
+      'require': function(mod) {
+        if (mod.require) {
+          return mod.require;
+        } else {
+          return (mod.require = context.makeRequire());
+        }
+      },
+      'exports': function(mod) {
+        mod.usingExports = true;
+        if (mod.map.isDefine) {
+          if (mod.exports) {
+            return (defined[mod.map.id] = mod.exports);
+          } else {
+            return (mod.exports = defined[mod.map.id] = {});
+          }
+        }
+      },
+      'module': function(mod) {
+        if (mod.module) {
+          return mod.module;
+        } else {
+          return (mod.module = {
+            id: mod.map.id,
+            uri: mod.map.url,
+            config: function() {
+              return getOwn(config.config, mod.map.id) || {};
+            },
+            exports: mod.exports || (mod.exports = {})
+          });
+        }
+      }
+    };
+
+    function cleanRegistry(id) {
+      // Clean up machinery used for waiting modules.
+      delete registry[id];
+      delete enabledRegistry[id];
+    }
+
+    function breakCycle(mod, traced, processed) {
+      var id = mod.map.id;
+
+      if (mod.error) {
+        mod.emit('error', mod.error);
+      } else {
+        traced[id] = true;
+        each(mod.depMaps, function(depMap, i) {
+          var depId = depMap.id,
+              dep = getOwn(registry, depId);
+
+          // Only force things that have not completed
+          // being defined, so still in the registry,
+          // and only if it has not been matched up
+          // in the module already.
+          if (dep && !mod.depMatched[i] && !processed[depId]) {
+            if (getOwn(traced, depId)) {
+              mod.defineDep(i, defined[depId]);
+              mod.check(); //pass false?
+            } else {
+              breakCycle(dep, traced, processed);
+            }
+          }
+        });
+        processed[id] = true;
+      }
+    }
+
+    function checkLoaded() {
+      var err,
+          waitInterval = config.waitSeconds * 1000,
+          // It is possible to disable the wait interval by using
+          // waitSeconds of 0.
+          expired = waitInterval &&
+                    (context.startTime + waitInterval) < new Date().getTime(),
+          noLoads = [],
+          reqCalls = [],
+          stillLoading = false,
+          needCycleCheck = true;
+
+      // Do not bother if this call was a result of a cycle break.
+      if (inCheckLoaded) {
+        return;
+      }
+
+      inCheckLoaded = true;
+
+      // Figure out the state of all the modules.
+      eachProp(enabledRegistry, function(mod) {
+        var map = mod.map,
+            modId = map.id;
+
+        // Skip things that are not enabled or in error state.
+        if (!mod.enabled) {
+          return;
+        }
+
+        if (!map.isDefine) {
+          reqCalls.push(mod);
+        }
+
+        if (!mod.error) {
+          // If the module should be executed, and it has not
+          // been inited and time is up, remember it.
+          if (!mod.inited && expired) {
+            noLoads.push(modId);
+          } else if (!mod.inited && mod.fetched && map.isDefine) {
+            stillLoading = true;
+            return (needCycleCheck = false);
+          }
+        }
+      });
+
+      if (expired && noLoads.length) {
+        // If wait time expired, throw error of unloaded modules.
+        err = makeError('timeout',
+                        'Load timeout for modules: ' + noLoads,
+                        null,
+                        noLoads);
+        err.contextName = context.contextName;
+        return onError(err);
+      }
+
+      // Not expired, check for a cycle.
+      if (needCycleCheck) {
+        each(reqCalls, function(mod) {
+          breakCycle(mod, {}, {});
+        });
+      }
+
+      // If still waiting on loads, and the waiting load is something
+      // other than a plugin resource, or there are still outstanding
+      // scripts, then just try back later.
+      if (!expired && stillLoading) {
+        // Something is still waiting to load. Wait for it, but only
+        // if a timeout is not already in effect.
+        if (!checkLoadedTimeoutId) {
+          checkLoadedTimeoutId = setTimeout(function() {
+            checkLoadedTimeoutId = 0;
+            checkLoaded();
+          }, 50);
+        }
+      }
+
+      inCheckLoaded = false;
+    }
+
+    Module = function(map) {
+      this.events = {};
+      this.map = map;
+      this.depExports = [];
+      this.depMaps = [];
+      this.depMatched = [];
+      this.depCount = 0;
+
+      /* this.exports this.factory
+         this.depMaps = [],
+         this.enabled, this.fetched
+      */
+    };
+
+    Module.prototype = {
+      init: function(depMaps, factory, errback, options) {
+        options = options || {};
+
+        // Do not do more inits if already done. Can happen if there
+        // are multiple define calls for the same module. That is not
+        // a normal, common case, but it is also not unexpected.
+        if (this.inited) {
+          return;
+        }
+
+        this.factory = factory;
+
+        if (errback) {
+          // Register for errors on this module.
+          this.on('error', errback);
+        } else if (this.events.error) {
+          // If no errback already, but there are error listeners
+          // on this module, set up an errback to pass to the deps.
+          errback = bind(this, function(err) {
+            this.emit('error', err);
+          });
+        }
+
+        // Do a copy of the dependency array, so that
+        // source inputs are not modified.
+        this.depMaps = depMaps && depMaps.slice(0);
+
+        this.errback = errback;
+
+        // Indicate this module has be initialized
+        this.inited = true;
+
+        this.ignore = options.ignore;
+
+        // Could have option to init this module in enabled mode,
+        // or could have been previously marked as enabled. However,
+        // the dependencies are not known until init is called. So
+        // if enabled previously, now trigger dependencies as enabled.
+        if (options.enabled || this.enabled) {
+          // Enable this module and dependencies.
+          // Will call this.check()
+          this.enable();
+        } else {
+          this.check();
+        }
+      },
+
+      defineDep: function(i, depExports) {
+        // Because of cycles, defined callback for a given
+        // export can be called more than once.
+        if (!this.depMatched[i]) {
+          this.depMatched[i] = true;
+          this.depCount -= 1;
+          this.depExports[i] = depExports;
+        }
+      },
+
+      fetch: function() {
+        if (this.fetched) {
+          return;
+        }
+        this.fetched = true;
+
+        context.startTime = (new Date()).getTime();
+
+        return this.load();
+      },
+
+      load: function() {
+        var url = this.map.url;
+
+        // Regular dependency.
+        if (!urlFetched[url]) {
+          urlFetched[url] = true;
+          context.load(this.map.id, url);
+        }
+      },
+
+      /**
+       * Checks if the module is ready to define itself, and if so,
+       * define it.
+       */
+      check: function() {
+        if (!this.enabled || this.enabling) {
+          return;
+        }
+
+        var err, cjsModule,
+            id = this.map.id,
+            depExports = this.depExports,
+            exports = this.exports,
+            factory = this.factory;
+
+        if (!this.inited) {
+          // Only fetch if not already in the defQueue and not 'main' module.
+          if (!hasProp(context.defQueueMap, id) && this.map.name != 'main') {
+            this.fetch();
+          }
+        } else if (this.error) {
+          this.emit('error', this.error);
+        } else if (!this.defining) {
+          // The factory could trigger another require call
+          // that would result in checking this module to
+          // define itself again. If already in the process
+          // of doing that, skip this work.
+          this.defining = true;
+
+          if (this.depCount < 1 && !this.defined) {
+            if (isFunction(factory)) {
+              // If there is an error listener, favor passing
+              // to that instead of throwing an error. However,
+              // only do it for define()'d  modules. require
+              // errbacks should not be called for failures in
+              // their callbacks (#699). However if a global
+              // onError is set, use that.
+              if ((this.events.error && this.map.isDefine) ||
+                  req.onError !== defaultOnError) {
+                try {
+                  exports = context.execCb(id, factory, depExports, exports);
+                } catch (e) {
+                  err = e;
+                }
+              } else {
+                exports = context.execCb(id, factory, depExports, exports);
+              }
+
+              // Favor return value over exports. If node/cjs in
+              // play, then will not have a return value anyway.
+              // Favor module.exports assignment over exports
+              // object.
+              if (this.map.isDefine && exports === undefined) {
+                cjsModule = this.module;
+                if (cjsModule) {
+                  exports = cjsModule.exports;
+                } else if (this.usingExports) {
+                  // exports already set the defined value.
+                  exports = this.exports;
+                }
+              }
+
+              if (err) {
+                err.requireMap = this.map;
+                err.requireModules = this.map.isDefine ? [this.map.id] : null;
+                err.requireType = this.map.isDefine ? 'define' : 'require';
+                return onError((this.error = err));
+              }
+            } else {
+              // Just a literal value
+              exports = factory;
+            }
+
+            this.exports = exports;
+
+            if (this.map.isDefine && !this.ignore) {
+              defined[id] = exports;
+
+              if (req.onResourceLoad) {
+                var resLoadMaps = [];
+                each(this.depMaps, function(depMap) {
+                  resLoadMaps.push(depMap.normalizedMap || depMap);
+                });
+                req.onResourceLoad(context, this.map, resLoadMaps);
+              }
+            }
+
+            // Clean up
+            cleanRegistry(id);
+
+            this.defined = true;
+          }
+
+          // Finished the define stage. Allow calling check again
+          // to allow define notifications below in the case of a
+          // cycle.
+          this.defining = false;
+
+          if (this.defined && !this.defineEmitted) {
+            this.defineEmitted = true;
+            this.emit('defined', this.exports);
+            this.defineEmitComplete = true;
+          }
+        }
+      },
+
+      enable: function() {
+        enabledRegistry[this.map.id] = this;
+        this.enabled = true;
+
+        // Set flag mentioning that the module is enabling,
+        // so that immediate calls to the defined callbacks
+        // for dependencies do not trigger inadvertent load
+        // with the depCount still being zero.
+        this.enabling = true;
+
+        // Enable each dependency
+        each(this.depMaps, bind(this, function(depMap, i) {
+          var id, mod, handler;
+
+          if (typeof depMap === 'string') {
+            // Dependency needs to be converted to a depMap
+            // and wired up to this module.
+            depMap = makeModuleMap(
+                depMap,
+                (this.map.isDefine ? this.map : this.map.parentMap),
+                true);
+            this.depMaps[i] = depMap;
+
+            this.depCount += 1;
+
+            on(depMap, 'defined', bind(this, function(depExports) {
+              if (this.undefed) {
+                return;
+              }
+              this.defineDep(i, depExports);
+              this.check();
+            }));
+
+            if (this.errback) {
+              on(depMap, 'error', bind(this, this.errback));
+            } else if (this.events.error) {
+              // No direct errback on this module, but something
+              // else is listening for errors, so be sure to
+              // propagate the error correctly.
+              on(depMap, 'error', bind(this, function(err) {
+                this.emit('error', err);
+              }));
+            }
+          }
+
+          id = depMap.id;
+          mod = registry[id];
+
+          // Skip special modules like 'require', 'exports', 'module'
+          // Also, don't call enable if it is already enabled,
+          // important in circular dependency cases.
+          if (!hasProp(handlers, id) && mod && !mod.enabled) {
+            context.enable(depMap, this);
+          }
+        }));
+
+        this.enabling = false;
+
+        this.check();
+      },
+
+      on: function(name, cb) {
+        var cbs = this.events[name];
+        if (!cbs) {
+          cbs = this.events[name] = [];
+        }
+        cbs.push(cb);
+      },
+
+      emit: function(name, evt) {
+        each(this.events[name], function(cb) {
+          cb(evt);
+        });
+        if (name === 'error') {
+          // Now that the error handler was triggered, remove
+          // the listeners, since this broken Module instance
+          // can stay around for a while in the registry.
+          delete this.events[name];
+        }
+      }
+    };
+
+    function callGetModule(args) {
+      // Skip modules already defined.
+      if (!hasProp(defined, args[0])) {
+        getModule(makeModuleMap(args[0], null)).init(args[1], args[2]);
+      }
+    }
+
+    function intakeDefines() {
+      var args;
+
+      // Any defined modules in the global queue, intake them now.
+      takeGlobalQueue();
+
+      // Make sure any remaining defQueue items get properly processed.
+      while (defQueue.length) {
+        args = defQueue.shift();
+        if (args[0] === null) {
+          return onError(makeError('mismatch',
+                                   'Mismatched anonymous define() module: ' +
+                                   args[args.length - 1]));
+        } else {
+          // args are id, deps, factory. Should be normalized by the
+          // define() function.
+          callGetModule(args);
+        }
+      }
+      context.defQueueMap = {};
+    }
+
+    context = {
+      config: config,
+      contextName: contextName,
+      registry: registry,
+      defined: defined,
+      urlFetched: urlFetched,
+      defQueue: defQueue,
+      defQueueMap: {},
+      Module: Module,
+      makeModuleMap: makeModuleMap,
+      nextTick: req.nextTick,
+      onError: onError,
+
+      /**
+       * Set a configuration for the context.
+       */
+      configure: function() {
+        // If there are any "waiting to execute" modules in the registry,
+        // update the maps for them, since their info, like URLs to load,
+        // may have changed.
+        eachProp(registry, function(mod, id) {
+          // If module already has init called, since it is too
+          // late to modify them.
+          if (!mod.inited) {
+            mod.map = makeModuleMap(id, null);
+          }
+        });
+      },
+
+      makeRequire: function() {
+        function localRequire(deps, callback, errback) {
+          var id, map, requireMod;
+
+          if (typeof deps === 'string') {
+            if (isFunction(callback)) {
+              // Invalid call
+              return onError(makeError('requireargs', 'Invalid require call'),
+                             errback);
+            }
+
+            // Synchronous access to one module. If require.get is
+            // available (as in the Node adapter), prefer that.
+            if (req.get) {
+              return req.get(context, deps, null, localRequire);
+            }
+
+            // Normalize module name, if it contains . or ..
+            map = makeModuleMap(deps, null, true);
+            id = map.id;
+
+            if (!hasProp(defined, id)) {
+              return onError(makeError(
+                                 'notloaded', 'Module name "' + id +
+                                 '" has not been loaded yet for context: ' +
+                                 contextName + '. Use require([])'));
+            }
+            return defined[id];
+          }
+
+          // Grab defines waiting in the global queue.
+          intakeDefines();
+
+          // Mark all the dependencies as needing to be loaded.
+          context.nextTick(function() {
+            // Some defines could have been added since the
+            // require call, collect them.
+            intakeDefines();
+
+            requireMod = getModule(makeModuleMap(null));
+
+            requireMod.init(deps, callback, errback, {
+              enabled: true
+            });
+
+            checkLoaded();
+          });
+
+          return localRequire;
+        }
+
+        return localRequire;
+      },
+
+      /**
+       * Called to enable a module if it is still in the registry
+       * awaiting enablement. A second arg, parent, the parent module,
+       * is passed in for context, when this method is overridden by
+       * the optimizer. Not shown here to keep code compact.
+       */
+      enable: function(depMap) {
+        var mod = getOwn(registry, depMap.id);
+        if (mod) {
+          getModule(depMap).enable();
+        }
+      },
+
+      /**
+       * Internal method used by environment adapters to complete a load event.
+       * A load event could be a script load or just a load pass from a
+       * synchronous load call.
+       * @param {String} moduleName the name of the module to potentially
+       *     complete.
+       */
+      completeLoad: function(moduleName) {
+        var found, args, mod;
+        takeGlobalQueue();
+
+        while (defQueue.length) {
+          args = defQueue.shift();
+          if (args[0] === null) {
+            args[0] = moduleName;
+            // If already found an anonymous module and bound it
+            // to this name, then this is some other anon module
+            // waiting for its completeLoad to fire.
+            if (found) {
+              break;
+            }
+            found = true;
+          } else if (args[0] === moduleName) {
+            // Found matching define call for this script!
+            found = true;
+          }
+
+          callGetModule(args);
+        }
+        context.defQueueMap = {};
+
+        // Do this after the cycle of callGetModule in case the result
+        // of those calls/init calls changes the registry.
+        mod = getOwn(registry, moduleName);
+
+        if (!found && !hasProp(defined, moduleName) && mod && !mod.inited) {
+          // A script that does not call define(), so just simulate
+          // the call for it.
+          callGetModule([moduleName, [], null]);
+        }
+
+        checkLoaded();
+      },
+
+      /**
+       * Converts a module name to a file path. Supports cases where
+       * moduleName may actually be just an URL.
+       */
+      nameToUrl: function(moduleName, ext) {
+        var syms, i, url, parentPath, bundleId;
+
+        // If a colon is in the URL, it indicates a protocol is used and it
+        // is just an URL to a file, or if it starts with a slash, contains a
+        // query arg (i.e. ?) or ends with .js, then assume the user meant to
+        // use an url and not a module id. The slash is important for
+        // protocol-less URLs as well as full paths.
+        if (req.jsExtRegExp.test(moduleName)) {
+            // Just a plain path, not module name lookup, so just return it.
+            // Add extension if it is included. This is a bit wonky, only
+            // non-.js things pass an extension, this method probably needs
+            // to be reworked.
+            url = moduleName;
+        } else {
+          syms = moduleName.split('/');
+          // Join the path parts together, then figure out if baseUrl is needed.
+          url = syms.join('/');
+          url += (/^data\:|\?/.test(url) || '.js');
+          url = (url.charAt(0) === '/' ||
+                 url.match(/^[\w\+\.\-]+:/) ? '' : config.baseUrl) + url;
+        }
+
+        return url;
+      },
+
+      // Delegates to req.load. Broken out as a separate function to
+      // allow overriding in the optimizer.
+      load: function(id, url) {
+        req.load(context, id, url);
+      },
+
+      /**
+       * Executes a module callback function. Broken out as a separate function
+       * solely to allow the build system to sequence the files in the built
+       * layer in the right sequence.
+       *
+       * @private
+       */
+      execCb: function(name, callback, args, exports) {
+        return callback.apply(exports, args);
+      },
+
+      /**
+       * Direct callback for load error.
+       */
+      onScriptFailure: function(moduleName) {
+        onError(makeError('scripterror', 'Script error for "' +
+                          moduleName + '"'), null, [moduleName]);
+      },
+    };
+
+    context.require = context.makeRequire();
+    return context;
+  }
+
+  /**
+   * Main entry point.
+   *
+   * If the only argument to require is a string, then the module that
+   * is represented by that string is fetched for the appropriate context.
+   *
+   * If the first argument is an array, then it will be treated as an array
+   * of dependency string names to fetch. An optional function callback can
+   * be specified to execute when all of those dependencies are available.
+   *
+   * Make a local req variable to help Caja compliance (it assumes things
+   * on a require that are not standardized), and to give a short
+   * name for minification/local scope use.
+   */
+  req = requirejs = function(deps, callback, errback, optional) {
+
+    // Find the right context, use default
+    var context, config,
+        contextName = defContextName;
+
+    // Determine if have config object in the call.
+    if (!isArray(deps) && typeof deps !== 'string') {
+      // deps is a config object
+      config = deps;
+      if (isArray(callback)) {
+        // Adjust args if there are dependencies
+        deps = callback;
+        callback = errback;
+        errback = optional;
+      } else {
+        deps = [];
+      }
+    }
+
+    context = getOwn(contexts, contextName);
+    if (!context) {
+      context = contexts[contextName] = req.s.newContext(contextName);
+    }
+
+    if (config) {
+      context.configure(config);
+    }
+
+    return context.require(deps, callback, errback);
+  };
+
+  /**
+   * Execute something after the current tick
+   * of the event loop. Override for other envs
+   * that have a better solution than setTimeout.
+   * @param  {Function} fn function to execute later.
+   */
+  req.nextTick = typeof setTimeout !== 'undefined' ? function(fn) {
+    setTimeout(fn, 4);
+  } : function(fn) { fn(); };
+
+  // Used to filter out dependencies that are already paths.
+  req.jsExtRegExp = /^\/|:|\?|\.js$/;
+  s = req.s = {
+    contexts: contexts,
+    newContext: newContext
+  };
+
+  // Create default context.
+  req({});
+
+  /**
+   * Any errors that require explicitly generates will be passed to this
+   * function. Intercept/override it if you want custom error handling.
+   * @param {Error} err the error object.
+   */
+  req.onError = defaultOnError;
+
+  /**
+   * Does the request to load a module for the browser case.
+   * Make this a separate function to allow other environments
+   * to override it.
+   *
+   * @param {Object} context the require context to find state.
+   * @param {String} moduleName the name of the module.
+   * @param {Object} url the URL to the module.
+   */
+  req.load = function(context, moduleName, url) {
+    var config = (context && context.config) || {};
+    var loadId = __crWeb.webUIModuleLoadNotifier.addPendingContext(
+        moduleName, context);
+    chrome.send('webui.loadMojo', [moduleName, loadId]);
+   };
+
+  /**
+   * The function that handles definitions of modules. Differs from
+   * require() in that a string for the module should be the first argument,
+   * and the function to execute after dependencies are loaded should
+   * return a value to define the module corresponding to the first argument's
+   * name.
+   */
+  define = function(name, deps, callback) {
+    var node, context;
+
+    // Allow for anonymous modules
+    if (typeof name !== 'string') {
+      // Adjust args appropriately
+      callback = deps;
+      deps = name;
+      name = null;
+    }
+
+    // This module may not have dependencies
+    if (!isArray(deps)) {
+      callback = deps;
+      deps = null;
+    }
+
+    // If no name, and callback is a function, then figure out if it a
+    // CommonJS thing with dependencies.
+    if (!deps && isFunction(callback)) {
+      deps = [];
+      // Remove comments from the callback string,
+      // look for require calls, and pull them into the dependencies,
+      // but only if there are function args.
+      if (callback.length) {
+        callback
+            .toString()
+            .replace(commentRegExp, commentReplace)
+            .replace(cjsRequireRegExp, function(match, dep) {
+                deps.push(dep);
+            });
+
+        // May be a CommonJS thing even without require calls, but still
+        // could use exports, and module. Avoid doing exports and module
+        // work though if it just needs require.
+        // REQUIRES the function to expect the CommonJS variables in the
+        // order listed below.
+        deps = (callback.length === 1 ?
+                    ['require'] :
+                    ['require', 'exports', 'module']).concat(deps);
+      }
+    }
+
+    // Always save off evaluating the def call until the script onload
+    // handler. This allows multiple modules to be in a file without
+    // prematurely tracing dependencies, and allows for anonymous module
+    // support, where the module name is not known until the script onload
+    // event occurs. If no context, use the global queue, and get it
+    // processed in the onscript load callback.
+    if (context) {
+      context.defQueue.push([name, deps, callback]);
+      context.defQueueMap[name] = true;
+    } else {
+      globalDefQueue.push([name, deps, callback]);
+    }
+  };
+
+  req();
+}(this));
+
+document.addEventListener("DOMContentLoaded", function(event) {
+  requirejs(['main'], function(main) {
+    main();
+  }, function(error) {
+    throw error;
+  });
+});