require.js

/** vim: et:ts=4:sw=4:sts=4
 * @license RequireJS 1.0.7 Copyright (c) 2010-2012, The Dojo Foundation All Rights Reserved.
 * Available via the MIT or new BSD license.
 * see: http://github.com/jrburke/requirejs for details
 */
/*jslint strict: false, plusplus: false, sub: true */
/*global window, navigator, document, importScripts, jQuery, setTimeout, opera */

var requirejs, require, define;
(function () {
  //Change this version number for each release.
  var version = "1.0.7",
    commentRegExp = /(\/\*([\s\S]*?)\*\/|([^:]|^)\/\/(.*)$)/mg,
    cjsRequireRegExp = /require\(\s*["']([^'"\s]+)["']\s*\)/g,
    currDirRegExp = /^\.\//,
    jsSuffixRegExp = /\.js$/,
    ostring = Object.prototype.toString,
    ap = Array.prototype,
    aps = ap.slice,
    apsp = ap.splice,
    isBrowser = !!(typeof window !== "undefined" && navigator && document),
    isWebWorker = !isBrowser && typeof importScripts !== "undefined",
    //PS3 indicates loaded and complete, but need to wait for complete
    //specifically. Sequence is "loading", "loaded", execution,
    // then "complete". The UA check is unfortunate, but not sure how
    //to feature test w/o causing perf issues.
    readyRegExp = isBrowser && navigator.platform === 'PLAYSTATION 3' ?
      /^complete$/ : /^(complete|loaded)$/,
    defContextName = "_",
    //Oh the tragedy, detecting opera. See the usage of isOpera for reason.
    isOpera = typeof opera !== "undefined" && opera.toString() === "[object Opera]",
    empty = {},
    contexts = {},
    globalDefQueue = [],
    interactiveScript = null,
    checkLoadedDepth = 0,
    useInteractive = false,
    reservedDependencies = {
      require: true,
      module: true,
      exports: true
    },
    req, cfg = {}, currentlyAddingScript, s, head, baseElement, scripts, script,
    src, subPath, mainScript, dataMain, globalI, ctx, jQueryCheck, checkLoadedTimeoutId;

  function isFunction(it) {
    return ostring.call(it) === "[object Function]";
  }

  function isArray(it) {
    return ostring.call(it) === "[object Array]";
  }

  /**
   * Simple function to mix in properties from source into target,
   * but only if target does not already have a property of the same name.
   * This is not robust in IE for transferring methods that match
   * Object.prototype names, but the uses of mixin here seem unlikely to
   * trigger a problem related to that.
   */
  function mixin(target, source, force) {
    for (var prop in source) {
      if (!(prop in empty) && (!(prop in target) || force)) {
        target[prop] = source[prop];
      }
    }
    return req;
  }

  /**
   * 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) {
    var e = new Error(msg + '\nhttp://requirejs.org/docs/errors.html#' + id);
    if (err) {
      e.originalError = err;
    }
    return e;
  }

  /**
   * Used to set up package paths from a packagePaths or packages config object.
   * @param {Object} pkgs the object to store the new package config
   * @param {Array} currentPackages an array of packages to configure
   * @param {String} [dir] a prefix dir to use.
   */
  function configurePackageDir(pkgs, currentPackages, dir) {
    var i, location, pkgObj;

    for (i = 0; (pkgObj = currentPackages[i]); i++) {
      pkgObj = typeof pkgObj === "string" ? { name: pkgObj } : pkgObj;
      location = pkgObj.location;

      //Add dir to the path, but avoid paths that start with a slash
      //or have a colon (indicates a protocol)
      if (dir && (!location || (location.indexOf("/") !== 0 && location.indexOf(":") === -1))) {
        location = dir + "/" + (location || pkgObj.name);
      }

      //Create a brand new object on pkgs, since currentPackages can
      //be passed in again, and config.pkgs is the internal transformed
      //state for all package configs.
      pkgs[pkgObj.name] = {
        name: pkgObj.name,
        location: location || pkgObj.name,
        //Remove leading dot in main, so main paths are normalized,
        //and remove any trailing .js, since different package
        //envs have different conventions: some use a module name,
        //some use a file name.
        main: (pkgObj.main || "main")
          .replace(currDirRegExp, '')
          .replace(jsSuffixRegExp, '')
      };
    }
  }

  /**
   * jQuery 1.4.3-1.5.x use a readyWait/ready() pairing to hold DOM
   * ready callbacks, but jQuery 1.6 supports a holdReady() API instead.
   * At some point remove the readyWait/ready() support and just stick
   * with using holdReady.
   */
  function jQueryHoldReady($, shouldHold) {
    if ($.holdReady) {
      $.holdReady(shouldHold);
    } else if (shouldHold) {
      $.readyWait += 1;
    } else {
      $.ready(true);
    }
  }

  if (typeof define !== "undefined") {
    //If a define is already in play via another AMD loader,
    //do not overwrite.
    return;
  }

  if (typeof requirejs !== "undefined") {
    if (isFunction(requirejs)) {
      //Do not overwrite and existing requirejs instance.
      return;
    } else {
      cfg = requirejs;
      requirejs = undefined;
    }
  }

  //Allow for a require config object
  if (typeof require !== "undefined" && !isFunction(require)) {
    //assume it is a config object.
    cfg = require;
    require = undefined;
  }

  /**
   * Creates a new context for use in require and define calls.
   * Handle most of the heavy lifting. Do not want to use an object
   * with prototype here to avoid using "this" in require, in case it
   * needs to be used in more super secure envs that do not want this.
   * Also there should not be that many contexts in the page. Usually just
   * one for the default context, but could be extra for multiversion cases
   * or if a package needs a special context for a dependency that conflicts
   * with the standard context.
   */
  function newContext(contextName) {
    var context, resume,
      config = {
        waitSeconds: 7,
        baseUrl: "./",
        paths: {},
        pkgs: {},
        catchError: {}
      },
      defQueue = [],
      specified = {
        "require": true,
        "exports": true,
        "module": true
      },
      urlMap = {},
      defined = {},
      loaded = {},
      waiting = {},
      waitAry = [],
      urlFetched = {},
      managerCounter = 0,
      managerCallbacks = {},
      plugins = {},
      //Used to indicate which modules in a build scenario
      //need to be full executed.
      needFullExec = {},
      fullExec = {},
      resumeDepth = 0;

    /**
     * Trims the . and .. from an array of path segments.
     * It will keep a leading path segment if a .. will become
     * the first path segment, to help with module name lookups,
     * which act like paths, but can be remapped. But the end result,
     * all paths that use this function should look normalized.
     * NOTE: this method MODIFIES the input array.
     * @param {Array} ary the array of path segments.
     */
    function trimDots(ary) {
      var i, part;
      for (i = 0; (part = ary[i]); i++) {
        if (part === ".") {
          ary.splice(i, 1);
          i -= 1;
        } else if (part === "..") {
          if (i === 1 && (ary[2] === '..' || ary[0] === '..')) {
            //End of the line. Keep at least one non-dot
            //path segment at the front so it can be mapped
            //correctly to disk. Otherwise, there is likely
            //no path mapping for a path starting with '..'.
            //This can still fail, but catches the most reasonable
            //uses of ..
            break;
          } else if (i > 0) {
            ary.splice(i - 1, 2);
            i -= 2;
          }
        }
      }
    }

    /**
     * Given a relative module name, like ./something, normalize it to
     * a real name that can be mapped to a path.
     * @param {String} name the relative name
     * @param {String} baseName a real name that the name arg is relative
     * to.
     * @returns {String} normalized name
     */
    function normalize(name, baseName) {
      var pkgName, pkgConfig;

      //Adjust any relative paths.
      if (name && name.charAt(0) === ".") {
        //If have a base name, try to normalize against it,
        //otherwise, assume it is a top-level require that will
        //be relative to baseUrl in the end.
        if (baseName) {
          if (config.pkgs[baseName]) {
            //If the baseName is a package name, then just treat it as one
            //name to concat the name with.
            baseName = [baseName];
          } else {
            //Convert baseName to array, and lop off the last part,
            //so that . matches that "directory" and not name of the baseName's
            //module. For instance, baseName of "one/two/three", maps to
            //"one/two/three.js", but we want the directory, "one/two" for
            //this normalization.
            baseName = baseName.split("/");
            baseName = baseName.slice(0, baseName.length - 1);
          }

          name = baseName.concat(name.split("/"));
          trimDots(name);

          //Some use of packages may use a . path to reference the
          //"main" module name, so normalize for that.
          pkgConfig = config.pkgs[(pkgName = name[0])];
          name = name.join("/");
          if (pkgConfig && name === pkgName + '/' + pkgConfig.main) {
            name = pkgName;
          }
        } else if (name.indexOf("./") === 0) {
          // No baseName, so this is ID is resolved relative
          // to baseUrl, pull off the leading dot.
          name = name.substring(2);
        }
      }
      return name;
    }

    /**
     * Creates a module mapping that includes plugin prefix, module
     * name, and path. If parentModuleMap is provided it will
     * also normalize the name via require.normalize()
     *
     * @param {String} name the module name
     * @param {String} [parentModuleMap] parent module map
     * for the module name, used to resolve relative names.
     *
     * @returns {Object}
     */
    function makeModuleMap(name, parentModuleMap) {
      var index = name ? name.indexOf("!") : -1,
        prefix = null,
        parentName = parentModuleMap ? parentModuleMap.name : null,
        originalName = name,
        normalizedName, url, pluginModule;

      if (index !== -1) {
        prefix = name.substring(0, index);
        name = name.substring(index + 1, name.length);
      }

      if (prefix) {
        prefix = normalize(prefix, parentName);
      }

      //Account for relative paths if there is a base name.
      if (name) {
        if (prefix) {
          pluginModule = defined[prefix];
          if (pluginModule && pluginModule.normalize) {
            //Plugin is loaded, use its normalize method.
            normalizedName = pluginModule.normalize(name, function (name) {
              return normalize(name, parentName);
            });
          } else {
            normalizedName = normalize(name, parentName);
          }
        } else {
          //A regular module.
          normalizedName = normalize(name, parentName);

          url = urlMap[normalizedName];
          if (!url) {
            //Calculate url for the module, if it has a name.
            //Use name here since nameToUrl also calls normalize,
            //and for relative names that are outside the baseUrl
            //this causes havoc. Was thinking of just removing
            //parentModuleMap to avoid extra normalization, but
            //normalize() still does a dot removal because of
            //issue #142, so just pass in name here and redo
            //the normalization. Paths outside baseUrl are just
            //messy to support.
            url = context.nameToUrl(name, null, parentModuleMap);

            //Store the URL mapping for later.
            urlMap[normalizedName] = url;
          }
        }
      }

      return {
        prefix: prefix,
        name: normalizedName,
        parentMap: parentModuleMap,
        url: url,
        originalName: originalName,
        fullName: prefix ? prefix + "!" + (normalizedName || '') : normalizedName
      };
    }

    /**
     * Determine if priority loading is done. If so clear the priorityWait
     */
    function isPriorityDone() {
      var priorityDone = true,
        priorityWait = config.priorityWait,
        priorityName, i;
      if (priorityWait) {
        for (i = 0; (priorityName = priorityWait[i]); i++) {
          if (!loaded[priorityName]) {
            priorityDone = false;
            break;
          }
        }
        if (priorityDone) {
          delete config.priorityWait;
        }
      }
      return priorityDone;
    }

    function makeContextModuleFunc(func, relModuleMap, enableBuildCallback) {
      return function () {
        //A version of a require function that passes a moduleName
        //value for items that may need to
        //look up paths relative to the moduleName
        var args = aps.call(arguments, 0), lastArg;
        if (enableBuildCallback &&
          isFunction((lastArg = args[args.length - 1]))) {
          lastArg.__requireJsBuild = true;
        }
        args.push(relModuleMap);
        return func.apply(null, args);
      };
    }

    /**
     * Helper function that creates a require function object to give to
     * modules that ask for it as a dependency. It needs to be specific
     * per module because of the implication of path mappings that may
     * need to be relative to the module name.
     */
    function makeRequire(relModuleMap, enableBuildCallback, altRequire) {
      var modRequire = makeContextModuleFunc(altRequire || context.require, relModuleMap, enableBuildCallback);

      mixin(modRequire, {
        nameToUrl: makeContextModuleFunc(context.nameToUrl, relModuleMap),
        toUrl: makeContextModuleFunc(context.toUrl, relModuleMap),
        defined: makeContextModuleFunc(context.requireDefined, relModuleMap),
        specified: makeContextModuleFunc(context.requireSpecified, relModuleMap),
        isBrowser: req.isBrowser
      });
      return modRequire;
    }

    /*
     * Queues a dependency for checking after the loader is out of a
     * "paused" state, for example while a script file is being loaded
     * in the browser, where it may have many modules defined in it.
     */
    function queueDependency(manager) {
      context.paused.push(manager);
    }

    function execManager(manager) {
      var i, ret, err, errFile, errModuleTree,
        cb = manager.callback,
        map = manager.map,
        fullName = map.fullName,
        args = manager.deps,
        listeners = manager.listeners,
        cjsModule;

      //Call the callback to define the module, if necessary.
      if (cb && isFunction(cb)) {
        if (config.catchError.define) {
          try {
            ret = req.execCb(fullName, manager.callback, args, defined[fullName]);
          } catch (e) {
            err = e;
          }
        } else {
          ret = req.execCb(fullName, manager.callback, args, defined[fullName]);
        }

        if (fullName) {
          //If setting exports via "module" is in play,
          //favor that over return value and exports. After that,
          //favor a non-undefined return value over exports use.
          cjsModule = manager.cjsModule;
          if (cjsModule &&
            cjsModule.exports !== undefined &&
            //Make sure it is not already the exports value
            cjsModule.exports !== defined[fullName]) {
            ret = defined[fullName] = manager.cjsModule.exports;
          } else if (ret === undefined && manager.usingExports) {
            //exports already set the defined value.
            ret = defined[fullName];
          } else {
            //Use the return value from the function.
            defined[fullName] = ret;
            //If this module needed full execution in a build
            //environment, mark that now.
            if (needFullExec[fullName]) {
              fullExec[fullName] = true;
            }
          }
        }
      } else if (fullName) {
        //May just be an object definition for the module. Only
        //worry about defining if have a module name.
        ret = defined[fullName] = cb;

        //If this module needed full execution in a build
        //environment, mark that now.
        if (needFullExec[fullName]) {
          fullExec[fullName] = true;
        }
      }

      //Clean up waiting. Do this before error calls, and before
      //calling back listeners, so that bookkeeping is correct
      //in the event of an error and error is reported in correct order,
      //since the listeners will likely have errors if the
      //onError function does not throw.
      if (waiting[manager.id]) {
        delete waiting[manager.id];
        manager.isDone = true;
        context.waitCount -= 1;
        if (context.waitCount === 0) {
          //Clear the wait array used for cycles.
          waitAry = [];
        }
      }

      //Do not need to track manager callback now that it is defined.
      delete managerCallbacks[fullName];

      //Allow instrumentation like the optimizer to know the order
      //of modules executed and their dependencies.
      if (req.onResourceLoad && !manager.placeholder) {
        req.onResourceLoad(context, map, manager.depArray);
      }

      if (err) {
        errFile = (fullName ? makeModuleMap(fullName).url : '') ||
          err.fileName || err.sourceURL;
        errModuleTree = err.moduleTree;
        err = makeError('defineerror', 'Error evaluating ' +
          'module "' + fullName + '" at location "' +
          errFile + '":\n' +
          err + '\nfileName:' + errFile +
          '\nlineNumber: ' + (err.lineNumber || err.line), err);
        err.moduleName = fullName;
        err.moduleTree = errModuleTree;
        return req.onError(err);
      }

      //Let listeners know of this manager's value.
      for (i = 0; (cb = listeners[i]); i++) {
        cb(ret);
      }

      return undefined;
    }

    /**
     * Helper that creates a callack function that is called when a dependency
     * is ready, and sets the i-th dependency for the manager as the
     * value passed to the callback generated by this function.
     */
    function makeArgCallback(manager, i) {
      return function (value) {
        //Only do the work if it has not been done
        //already for a dependency. Cycle breaking
        //logic in forceExec could mean this function
        //is called more than once for a given dependency.
        if (!manager.depDone[i]) {
          manager.depDone[i] = true;
          manager.deps[i] = value;
          manager.depCount -= 1;
          if (!manager.depCount) {
            //All done, execute!
            execManager(manager);
          }
        }
      };
    }

    function callPlugin(pluginName, depManager) {
      var map = depManager.map,
        fullName = map.fullName,
        name = map.name,
        plugin = plugins[pluginName] ||
          (plugins[pluginName] = defined[pluginName]),
        load;

      //No need to continue if the manager is already
      //in the process of loading.
      if (depManager.loading) {
        return;
      }
      depManager.loading = true;

      load = function (ret) {
        depManager.callback = function () {
          return ret;
        };
        execManager(depManager);

        loaded[depManager.id] = true;

        //The loading of this plugin
        //might have placed other things
        //in the paused queue. In particular,
        //a loader plugin that depends on
        //a different plugin loaded resource.
        resume();
      };

      //Allow plugins to load other code without having to know the
      //context or how to "complete" the load.
      load.fromText = function (moduleName, text) {
        /*jslint evil: true */
        var hasInteractive = useInteractive;

        //Indicate a the module is in process of loading.
        loaded[moduleName] = false;
        context.scriptCount += 1;

        //Indicate this is not a "real" module, so do not track it
        //for builds, it does not map to a real file.
        context.fake[moduleName] = true;

        //Turn off interactive script matching for IE for any define
        //calls in the text, then turn it back on at the end.
        if (hasInteractive) {
          useInteractive = false;
        }

        req.exec(text);

        if (hasInteractive) {
          useInteractive = true;
        }

        //Support anonymous modules.
        context.completeLoad(moduleName);
      };

      //No need to continue if the plugin value has already been
      //defined by a build.
      if (fullName in defined) {
        load(defined[fullName]);
      } else {
        //Use parentName here since the plugin's name is not reliable,
        //could be some weird string with no path that actually wants to
        //reference the parentName's path.
        plugin.load(name, makeRequire(map.parentMap, true, function (deps, cb) {
          var moduleDeps = [],
            i, dep, depMap;
          //Convert deps to full names and hold on to them
          //for reference later, when figuring out if they
          //are blocked by a circular dependency.
          for (i = 0; (dep = deps[i]); i++) {
            depMap = makeModuleMap(dep, map.parentMap);
            deps[i] = depMap.fullName;
            if (!depMap.prefix) {
              moduleDeps.push(deps[i]);
            }
          }
          depManager.moduleDeps = (depManager.moduleDeps || []).concat(moduleDeps);
          return context.require(deps, cb);
        }), load, config);
      }
    }

    /**
     * Adds the manager to the waiting queue. Only fully
     * resolved items should be in the waiting queue.
     */
    function addWait(manager) {
      if (!waiting[manager.id]) {
        waiting[manager.id] = manager;
        waitAry.push(manager);
        context.waitCount += 1;
      }
    }

    /**
     * Function added to every manager object. Created out here
     * to avoid new function creation for each manager instance.
     */
    function managerAdd(cb) {
      this.listeners.push(cb);
    }

    function getManager(map, shouldQueue) {
      var fullName = map.fullName,
        prefix = map.prefix,
        plugin = prefix ? plugins[prefix] ||
          (plugins[prefix] = defined[prefix]) : null,
        manager, created, pluginManager, prefixMap;

      if (fullName) {
        manager = managerCallbacks[fullName];
      }

      if (!manager) {
        created = true;
        manager = {
          //ID is just the full name, but if it is a plugin resource
          //for a plugin that has not been loaded,
          //then add an ID counter to it.
          id: (prefix && !plugin ?
            (managerCounter++) + '__p@:' : '') +
            (fullName || '__r@' + (managerCounter++)),
          map: map,
          depCount: 0,
          depDone: [],
          depCallbacks: [],
          deps: [],
          listeners: [],
          add: managerAdd
        };

        specified[manager.id] = true;

        //Only track the manager/reuse it if this is a non-plugin
        //resource. Also only track plugin resources once
        //the plugin has been loaded, and so the fullName is the
        //true normalized value.
        if (fullName && (!prefix || plugins[prefix])) {
          managerCallbacks[fullName] = manager;
        }
      }

      //If there is a plugin needed, but it is not loaded,
      //first load the plugin, then continue on.
      if (prefix && !plugin) {
        prefixMap = makeModuleMap(prefix);

        //Clear out defined and urlFetched if the plugin was previously
        //loaded/defined, but not as full module (as in a build
        //situation). However, only do this work if the plugin is in
        //defined but does not have a module export value.
        if (prefix in defined && !defined[prefix]) {
          delete defined[prefix];
          delete urlFetched[prefixMap.url];
        }

        pluginManager = getManager(prefixMap, true);
        pluginManager.add(function (plugin) {
          //Create a new manager for the normalized
          //resource ID and have it call this manager when
          //done.
          var newMap = makeModuleMap(map.originalName, map.parentMap),
            normalizedManager = getManager(newMap, true);

          //Indicate this manager is a placeholder for the real,
          //normalized thing. Important for when trying to map
          //modules and dependencies, for instance, in a build.
          manager.placeholder = true;

          normalizedManager.add(function (resource) {
            manager.callback = function () {
              return resource;
            };
            execManager(manager);
          });
        });
      } else if (created && shouldQueue) {
        //Indicate the resource is not loaded yet if it is to be
        //queued.
        loaded[manager.id] = false;
        queueDependency(manager);
        addWait(manager);
      }

      return manager;
    }

    function main(inName, depArray, callback, relModuleMap) {
      var moduleMap = makeModuleMap(inName, relModuleMap),
        name = moduleMap.name,
        fullName = moduleMap.fullName,
        manager = getManager(moduleMap),
        id = manager.id,
        deps = manager.deps,
        i, depArg, depName, depPrefix, cjsMod;

      if (fullName) {
        //If module already defined for context, or already loaded,
        //then leave. Also leave if jQuery is registering but it does
        //not match the desired version number in the config.
        if (fullName in defined || loaded[id] === true ||
          (fullName === "jquery" && config.jQuery &&
            config.jQuery !== callback().fn.jquery)) {
          return;
        }

        //Set specified/loaded here for modules that are also loaded
        //as part of a layer, where onScriptLoad is not fired
        //for those cases. Do this after the inline define and
        //dependency tracing is done.
        specified[id] = true;
        loaded[id] = true;

        //If module is jQuery set up delaying its dom ready listeners.
        if (fullName === "jquery" && callback) {
          jQueryCheck(callback());
        }
      }

      //Attach real depArray and callback to the manager. Do this
      //only if the module has not been defined already, so do this after
      //the fullName checks above. IE can call main() more than once
      //for a module.
      manager.depArray = depArray;
      manager.callback = callback;

      //Add the dependencies to the deps field, and register for callbacks
      //on the dependencies.
      for (i = 0; i < depArray.length; i++) {
        depArg = depArray[i];
        //There could be cases like in IE, where a trailing comma will
        //introduce a null dependency, so only treat a real dependency
        //value as a dependency.
        if (depArg) {
          //Split the dependency name into plugin and name parts
          depArg = makeModuleMap(depArg, (name ? moduleMap : relModuleMap));
          depName = depArg.fullName;
          depPrefix = depArg.prefix;

          //Fix the name in depArray to be just the name, since
          //that is how it will be called back later.
          depArray[i] = depName;

          //Fast path CommonJS standard dependencies.
          if (depName === "require") {
            deps[i] = makeRequire(moduleMap);
          } else if (depName === "exports") {
            //CommonJS module spec 1.1
            deps[i] = defined[fullName] = {};
            manager.usingExports = true;
          } else if (depName === "module") {
            //CommonJS module spec 1.1
            manager.cjsModule = cjsMod = deps[i] = {
              id: name,
              uri: name ? context.nameToUrl(name, null, relModuleMap) : undefined,
              exports: defined[fullName]
            };
          } else if (depName in defined && !(depName in waiting) &&
            (!(fullName in needFullExec) ||
              (fullName in needFullExec && fullExec[depName]))) {
            //Module already defined, and not in a build situation
            //where the module is a something that needs full
            //execution and this dependency has not been fully
            //executed. See r.js's requirePatch.js for more info
            //on fullExec.
            deps[i] = defined[depName];
          } else {
            //Mark this dependency as needing full exec if
            //the current module needs full exec.
            if (fullName in needFullExec) {
              needFullExec[depName] = true;
              //Reset state so fully executed code will get
              //picked up correctly.
              delete defined[depName];
              urlFetched[depArg.url] = false;
            }

            //Either a resource that is not loaded yet, or a plugin
            //resource for either a plugin that has not
            //loaded yet.
            manager.depCount += 1;
            manager.depCallbacks[i] = makeArgCallback(manager, i);
            getManager(depArg, true).add(manager.depCallbacks[i]);
          }
        }
      }

      //Do not bother tracking the manager if it is all done.
      if (!manager.depCount) {
        //All done, execute!
        execManager(manager);
      } else {
        addWait(manager);
      }
    }

    /**
     * Convenience method to call main for a define call that was put on
     * hold in the defQueue.
     */
    function callDefMain(args) {
      main.apply(null, args);
    }

    /**
     * jQuery 1.4.3+ supports ways to hold off calling
     * calling jQuery ready callbacks until all scripts are loaded. Be sure
     * to track it if the capability exists.. Also, since jQuery 1.4.3 does
     * not register as a module, need to do some global inference checking.
     * Even if it does register as a module, not guaranteed to be the precise
     * name of the global. If a jQuery is tracked for this context, then go
     * ahead and register it as a module too, if not already in process.
     */
    jQueryCheck = function (jqCandidate) {
      if (!context.jQuery) {
        var $ = jqCandidate || (typeof jQuery !== "undefined" ? jQuery : null);

        if ($) {
          //If a specific version of jQuery is wanted, make sure to only
          //use this jQuery if it matches.
          if (config.jQuery && $.fn.jquery !== config.jQuery) {
            return;
          }

          if ("holdReady" in $ || "readyWait" in $) {
            context.jQuery = $;

            //Manually create a "jquery" module entry if not one already
            //or in process. Note this could trigger an attempt at
            //a second jQuery registration, but does no harm since
            //the first one wins, and it is the same value anyway.
            callDefMain(["jquery", [], function () {
              return jQuery;
            }]);

            //Ask jQuery to hold DOM ready callbacks.
            if (context.scriptCount) {
              jQueryHoldReady($, true);
              context.jQueryIncremented = true;
            }
          }
        }
      }
    };

    function findCycle(manager, traced) {
      var fullName = manager.map.fullName,
        depArray = manager.depArray,
        fullyLoaded = true,
        i, depName, depManager, result;

      if (manager.isDone || !fullName || !loaded[fullName]) {
        return result;
      }

      //Found the cycle.
      if (traced[fullName]) {
        return manager;
      }

      traced[fullName] = true;

      //Trace through the dependencies.
      if (depArray) {
        for (i = 0; i < depArray.length; i++) {
          //Some array members may be null, like if a trailing comma
          //IE, so do the explicit [i] access and check if it has a value.
          depName = depArray[i];
          if (!loaded[depName] && !reservedDependencies[depName]) {
            fullyLoaded = false;
            break;
          }
          depManager = waiting[depName];
          if (depManager && !depManager.isDone && loaded[depName]) {
            result = findCycle(depManager, traced);
            if (result) {
              break;
            }
          }
        }
        if (!fullyLoaded) {
          //Discard the cycle that was found, since it cannot
          //be forced yet. Also clear this module from traced.
          result = undefined;
          delete traced[fullName];
        }
      }

      return result;
    }

    function forceExec(manager, traced) {
      var fullName = manager.map.fullName,
        depArray = manager.depArray,
        i, depName, depManager, prefix, prefixManager, value;


      if (manager.isDone || !fullName || !loaded[fullName]) {
        return undefined;
      }

      if (fullName) {
        if (traced[fullName]) {
          return defined[fullName];
        }

        traced[fullName] = true;
      }

      //Trace through the dependencies.
      if (depArray) {
        for (i = 0; i < depArray.length; i++) {
          //Some array members may be null, like if a trailing comma
          //IE, so do the explicit [i] access and check if it has a value.
          depName = depArray[i];
          if (depName) {
            //First, make sure if it is a plugin resource that the
            //plugin is not blocked.
            prefix = makeModuleMap(depName).prefix;
            if (prefix && (prefixManager = waiting[prefix])) {
              forceExec(prefixManager, traced);
            }
            depManager = waiting[depName];
            if (depManager && !depManager.isDone && loaded[depName]) {
              value = forceExec(depManager, traced);
              manager.depCallbacks[i](value);
            }
          }
        }
      }

      return defined[fullName];
    }

    /**
     * Checks if all modules for a context are loaded, and if so, evaluates the
     * new ones in right dependency order.
     *
     * @private
     */
    function checkLoaded() {
      var 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 = "", hasLoadedProp = false, stillLoading = false,
        cycleDeps = [],
        i, prop, err, manager, cycleManager, moduleDeps;

      //If there are items still in the paused queue processing wait.
      //This is particularly important in the sync case where each paused
      //item is processed right away but there may be more waiting.
      if (context.pausedCount > 0) {
        return undefined;
      }

      //Determine if priority loading is done. If so clear the priority. If
      //not, then do not check
      if (config.priorityWait) {
        if (isPriorityDone()) {
          //Call resume, since it could have
          //some waiting dependencies to trace.
          resume();
        } else {
          return undefined;
        }
      }

      //See if anything is still in flight.
      for (prop in loaded) {
        if (!(prop in empty)) {
          hasLoadedProp = true;
          if (!loaded[prop]) {
            if (expired) {
              noLoads += prop + " ";
            } else {
              stillLoading = true;
              if (prop.indexOf('!') === -1) {
                //No reason to keep looking for unfinished
                //loading. If the only stillLoading is a
                //plugin resource though, keep going,
                //because it may be that a plugin resource
                //is waiting on a non-plugin cycle.
                cycleDeps = [];
                break;
              } else {
                moduleDeps = managerCallbacks[prop] && managerCallbacks[prop].moduleDeps;
                if (moduleDeps) {
                  cycleDeps.push.apply(cycleDeps, moduleDeps);
                }
              }
            }
          }
        }
      }

      //Check for exit conditions.
      if (!hasLoadedProp && !context.waitCount) {
        //If the loaded object had no items, then the rest of
        //the work below does not need to be done.
        return undefined;
      }
      if (expired && noLoads) {
        //If wait time expired, throw error of unloaded modules.
        err = makeError("timeout", "Load timeout for modules: " + noLoads);
        err.requireType = "timeout";
        err.requireModules = noLoads;
        err.contextName = context.contextName;
        return req.onError(err);
      }

      //If still loading but a plugin is waiting on a regular module cycle
      //break the cycle.
      if (stillLoading && cycleDeps.length) {
        for (i = 0; (manager = waiting[cycleDeps[i]]); i++) {
          if ((cycleManager = findCycle(manager, {}))) {
            forceExec(cycleManager, {});
            break;
          }
        }

      }

      //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 || context.scriptCount)) {
        //Something is still waiting to load. Wait for it, but only
        //if a timeout is not already in effect.
        if ((isBrowser || isWebWorker) && !checkLoadedTimeoutId) {
          checkLoadedTimeoutId = setTimeout(function () {
            checkLoadedTimeoutId = 0;
            checkLoaded();
          }, 50);
        }
        return undefined;
      }

      //If still have items in the waiting cue, but all modules have
      //been loaded, then it means there are some circular dependencies
      //that need to be broken.
      //However, as a waiting thing is fired, then it can add items to
      //the waiting cue, and those items should not be fired yet, so
      //make sure to redo the checkLoaded call after breaking a single
      //cycle, if nothing else loaded then this logic will pick it up
      //again.
      if (context.waitCount) {
        //Cycle through the waitAry, and call items in sequence.
        for (i = 0; (manager = waitAry[i]); i++) {
          forceExec(manager, {});
        }

        //If anything got placed in the paused queue, run it down.
        if (context.paused.length) {
          resume();
        }

        //Only allow this recursion to a certain depth. Only
        //triggered by errors in calling a module in which its
        //modules waiting on it cannot finish loading, or some circular
        //dependencies that then may add more dependencies.
        //The value of 5 is a bit arbitrary. Hopefully just one extra
        //pass, or two for the case of circular dependencies generating
        //more work that gets resolved in the sync node case.
        if (checkLoadedDepth < 5) {
          checkLoadedDepth += 1;
          checkLoaded();
        }
      }

      checkLoadedDepth = 0;

      //Check for DOM ready, and nothing is waiting across contexts.
      req.checkReadyState();

      return undefined;
    }

    /**
     * Resumes tracing of dependencies and then checks if everything is loaded.
     */
    resume = function () {
      var manager, map, url, i, p, args, fullName;

      //Any defined modules in the global queue, intake them now.
      context.takeGlobalQueue();

      resumeDepth += 1;

      if (context.scriptCount <= 0) {
        //Synchronous envs will push the number below zero with the
        //decrement above, be sure to set it back to zero for good measure.
        //require() calls that also do not end up loading scripts could
        //push the number negative too.
        context.scriptCount = 0;
      }

      //Make sure any remaining defQueue items get properly processed.
      while (defQueue.length) {
        args = defQueue.shift();
        if (args[0] === null) {
          return req.onError(makeError('mismatch', 'Mismatched anonymous define() module: ' + args[args.length - 1]));
        } else {
          callDefMain(args);
        }
      }

      //Skip the resume of paused dependencies
      //if current context is in priority wait.
      if (!config.priorityWait || isPriorityDone()) {
        while (context.paused.length) {
          p = context.paused;
          context.pausedCount += p.length;
          //Reset paused list
          context.paused = [];

          for (i = 0; (manager = p[i]); i++) {
            map = manager.map;
            url = map.url;
            fullName = map.fullName;

            //If the manager is for a plugin managed resource,
            //ask the plugin to load it now.
            if (map.prefix) {
              callPlugin(map.prefix, manager);
            } else {
              //Regular dependency.
              if (!urlFetched[url] && !loaded[fullName]) {
                req.load(context, fullName, url);

                //Mark the URL as fetched, but only if it is
                //not an empty: URL, used by the optimizer.
                //In that case we need to be sure to call
                //load() for each module that is mapped to
                //empty: so that dependencies are satisfied
                //correctly.
                if (url.indexOf('empty:') !== 0) {
                  urlFetched[url] = true;
                }
              }
            }
          }

          //Move the start time for timeout forward.
          context.startTime = (new Date()).getTime();
          context.pausedCount -= p.length;
        }
      }

      //Only check if loaded when resume depth is 1. It is likely that
      //it is only greater than 1 in sync environments where a factory
      //function also then calls the callback-style require. In those
      //cases, the checkLoaded should not occur until the resume
      //depth is back at the top level.
      if (resumeDepth === 1) {
        checkLoaded();
      }

      resumeDepth -= 1;

      return undefined;
    };

    //Define the context object. Many of these fields are on here
    //just to make debugging easier.
    context = {
      contextName: contextName,
      config: config,
      defQueue: defQueue,
      waiting: waiting,
      waitCount: 0,
      specified: specified,
      loaded: loaded,
      urlMap: urlMap,
      urlFetched: urlFetched,
      scriptCount: 0,
      defined: defined,
      paused: [],
      pausedCount: 0,
      plugins: plugins,
      needFullExec: needFullExec,
      fake: {},
      fullExec: fullExec,
      managerCallbacks: managerCallbacks,
      makeModuleMap: makeModuleMap,
      normalize: normalize,
      /**
       * Set a configuration for the context.
       * @param {Object} cfg config object to integrate.
       */
      configure: function (cfg) {
        var paths, prop, packages, pkgs, packagePaths, requireWait;

        //Make sure the baseUrl ends in a slash.
        if (cfg.baseUrl) {
          if (cfg.baseUrl.charAt(cfg.baseUrl.length - 1) !== "/") {
            cfg.baseUrl += "/";
          }
        }

        //Save off the paths and packages since they require special processing,
        //they are additive.
        paths = config.paths;
        packages = config.packages;
        pkgs = config.pkgs;

        //Mix in the config values, favoring the new values over
        //existing ones in context.config.
        mixin(config, cfg, true);

        //Adjust paths if necessary.
        if (cfg.paths) {
          for (prop in cfg.paths) {
            if (!(prop in empty)) {
              paths[prop] = cfg.paths[prop];
            }
          }
          config.paths = paths;
        }

        packagePaths = cfg.packagePaths;
        if (packagePaths || cfg.packages) {
          //Convert packagePaths into a packages config.
          if (packagePaths) {
            for (prop in packagePaths) {
              if (!(prop in empty)) {
                configurePackageDir(pkgs, packagePaths[prop], prop);
              }
            }
          }

          //Adjust packages if necessary.
          if (cfg.packages) {
            configurePackageDir(pkgs, cfg.packages);
          }

          //Done with modifications, assing packages back to context config
          config.pkgs = pkgs;
        }

        //If priority loading is in effect, trigger the loads now
        if (cfg.priority) {
          //Hold on to requireWait value, and reset it after done
          requireWait = context.requireWait;

          //Allow tracing some require calls to allow the fetching
          //of the priority config.
          context.requireWait = false;
          //But first, call resume to register any defined modules that may
          //be in a data-main built file before the priority config
          //call.
          resume();

          context.require(cfg.priority);

          //Trigger a resume right away, for the case when
          //the script with the priority load is done as part
          //of a data-main call. In that case the normal resume
          //call will not happen because the scriptCount will be
          //at 1, since the script for data-main is being processed.
          resume();

          //Restore previous state.
          context.requireWait = requireWait;
          config.priorityWait = cfg.priority;
        }

        //If a deps array or a config callback is specified, then call
        //require with those args. This is useful when require is defined as a
        //config object before require.js is loaded.
        if (cfg.deps || cfg.callback) {
          context.require(cfg.deps || [], cfg.callback);
        }
      },

      requireDefined: function (moduleName, relModuleMap) {
        return makeModuleMap(moduleName, relModuleMap).fullName in defined;
      },

      requireSpecified: function (moduleName, relModuleMap) {
        return makeModuleMap(moduleName, relModuleMap).fullName in specified;
      },

      require: function (deps, callback, relModuleMap) {
        var moduleName, fullName, moduleMap;
        if (typeof deps === "string") {
          if (isFunction(callback)) {
            //Invalid call
            return req.onError(makeError("requireargs", "Invalid require call"));
          }

          //Synchronous access to one module. If require.get is
          //available (as in the Node adapter), prefer that.
          //In this case deps is the moduleName and callback is
          //the relModuleMap
          if (req.get) {
            return req.get(context, deps, callback);
          }

          //Just return the module wanted. In this scenario, the
          //second arg (if passed) is just the relModuleMap.
          moduleName = deps;
          relModuleMap = callback;

          //Normalize module name, if it contains . or ..
          moduleMap = makeModuleMap(moduleName, relModuleMap);
          fullName = moduleMap.fullName;

          if (!(fullName in defined)) {
            return req.onError(makeError("notloaded", "Module name '" +
              moduleMap.fullName +
              "' has not been loaded yet for context: " +
              contextName));
          }
          return defined[fullName];
        }

        //Call main but only if there are dependencies or
        //a callback to call.
        if (deps && deps.length || callback) {
          main(null, deps, callback, relModuleMap);
        }

        //If the require call does not trigger anything new to load,
        //then resume the dependency processing.
        if (!context.requireWait) {
          while (!context.scriptCount && context.paused.length) {
            resume();
          }
        }
        return context.require;
      },

      /**
       * Internal method to transfer globalQueue items to this context's
       * defQueue.
       */
      takeGlobalQueue: function () {
        //Push all the globalDefQueue items into the context's defQueue
        if (globalDefQueue.length) {
          //Array splice in the values since the context code has a
          //local var ref to defQueue, so cannot just reassign the one
          //on context.
          apsp.apply(context.defQueue,
            [context.defQueue.length - 1, 0].concat(globalDefQueue));
          globalDefQueue = [];
        }
      },

      /**
       * 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 args;

        context.takeGlobalQueue();

        while (defQueue.length) {
          args = defQueue.shift();

          if (args[0] === null) {
            args[0] = moduleName;
            break;
          } else if (args[0] === moduleName) {
            //Found matching define call for this script!
            break;
          } else {
            //Some other named define call, most likely the result
            //of a build layer that included many define calls.
            callDefMain(args);
            args = null;
          }
        }
        if (args) {
          callDefMain(args);
        } else {
          //A script that does not call define(), so just simulate
          //the call for it. Special exception for jQuery dynamic load.
          callDefMain([moduleName, [],
            moduleName === "jquery" && typeof jQuery !== "undefined" ?
              function () {
                return jQuery;
              } : null]);
        }

        //Doing this scriptCount decrement branching because sync envs
        //need to decrement after resume, otherwise it looks like
        //loading is complete after the first dependency is fetched.
        //For browsers, it works fine to decrement after, but it means
        //the checkLoaded setTimeout 50 ms cost is taken. To avoid
        //that cost, decrement beforehand.
        if (req.isAsync) {
          context.scriptCount -= 1;
        }
        resume();
        if (!req.isAsync) {
          context.scriptCount -= 1;
        }
      },

      /**
       * Converts a module name + .extension into an URL path.
       * *Requires* the use of a module name. It does not support using
       * plain URLs like nameToUrl.
       */
      toUrl: function (moduleNamePlusExt, relModuleMap) {
        var index = moduleNamePlusExt.lastIndexOf("."),
          ext = null;

        if (index !== -1) {
          ext = moduleNamePlusExt.substring(index, moduleNamePlusExt.length);
          moduleNamePlusExt = moduleNamePlusExt.substring(0, index);
        }

        return context.nameToUrl(moduleNamePlusExt, ext, relModuleMap);
      },

      /**
       * Converts a module name to a file path. Supports cases where
       * moduleName may actually be just an URL.
       */
      nameToUrl: function (moduleName, ext, relModuleMap) {
        var paths, pkgs, pkg, pkgPath, syms, i, parentModule, url,
          config = context.config;

        //Normalize module name if have a base relative module name to work from.
        moduleName = normalize(moduleName, relModuleMap && relModuleMap.fullName);

        //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 or ends with .js, it is just a plain file.
        //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 + (ext ? ext : "");
        } else {
          //A module that needs to be converted to a path.
          paths = config.paths;
          pkgs = config.pkgs;

          syms = moduleName.split("/");
          //For each module name segment, see if there is a path
          //registered for it. Start with most specific name
          //and work up from it.
          for (i = syms.length; i > 0; i--) {
            parentModule = syms.slice(0, i).join("/");
            if (paths[parentModule]) {
              syms.splice(0, i, paths[parentModule]);
              break;
            } else if ((pkg = pkgs[parentModule])) {
              //If module name is just the package name, then looking
              //for the main module.
              if (moduleName === pkg.name) {
                pkgPath = pkg.location + '/' + pkg.main;
              } else {
                pkgPath = pkg.location;
              }
              syms.splice(0, i, pkgPath);
              break;
            }
          }

          //Join the path parts together, then figure out if baseUrl is needed.
          url = syms.join("/") + (ext || ".js");
          url = (url.charAt(0) === '/' || url.match(/^\w+:/) ? "" : config.baseUrl) + url;
        }

        return config.urlArgs ? url +
          ((url.indexOf('?') === -1 ? '?' : '&') +
            config.urlArgs) : url;
      }
    };

    //Make these visible on the context so can be called at the very
    //end of the file to bootstrap
    context.jQueryCheck = jQueryCheck;
    context.resume = resume;

    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) {

    //Find the right context, use default
    var contextName = defContextName,
      context, config;

    // 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 = arguments[2];
      } else {
        deps = [];
      }
    }

    if (config && config.context) {
      contextName = config.context;
    }

    context = contexts[contextName] ||
      (contexts[contextName] = newContext(contextName));

    if (config) {
      context.configure(config);
    }

    return context.require(deps, callback);
  };

  /**
   * Support require.config() to make it easier to cooperate with other
   * AMD loaders on globally agreed names.
   */
  req.config = function (config) {
    return req(config);
  };

  /**
   * Export require as a global, but only if it does not already exist.
   */
  if (!require) {
    require = req;
  }

  /**
   * Global require.toUrl(), to match global require, mostly useful
   * for debugging/work in the global space.
   */
  req.toUrl = function (moduleNamePlusExt) {
    return contexts[defContextName].toUrl(moduleNamePlusExt);
  };

  req.version = version;

  //Used to filter out dependencies that are already paths.
  req.jsExtRegExp = /^\/|:|\?|\.js$/;
  s = req.s = {
    contexts: contexts,
    //Stores a list of URLs that should not get async script tag treatment.
    skipAsync: {}
  };

  req.isAsync = req.isBrowser = isBrowser;
  if (isBrowser) {
    head = s.head = document.getElementsByTagName("head")[0];
    //If BASE tag is in play, using appendChild is a problem for IE6.
    //When that browser dies, this can be removed. Details in this jQuery bug:
    //http://dev.jquery.com/ticket/2709
    baseElement = document.getElementsByTagName("base")[0];
    if (baseElement) {
      head = s.head = baseElement.parentNode;
    }
  }

  /**
   * 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 = function (err) {
    throw err;
  };

  /**
   * 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) {
    req.resourcesReady(false);

    context.scriptCount += 1;
    req.attach(url, context, moduleName);

    //If tracking a jQuery, then make sure its ready callbacks
    //are put on hold to prevent its ready callbacks from
    //triggering too soon.
    if (context.jQuery && !context.jQueryIncremented) {
      jQueryHoldReady(context.jQuery, true);
      context.jQueryIncremented = true;
    }
  };

  function getInteractiveScript() {
    var scripts, i, script;
    if (interactiveScript && interactiveScript.readyState === 'interactive') {
      return interactiveScript;
    }

    scripts = document.getElementsByTagName('script');
    for (i = scripts.length - 1; i > -1 && (script = scripts[i]); i--) {
      if (script.readyState === 'interactive') {
        return (interactiveScript = script);
      }
    }

    return null;
  }

  /**
   * 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 functions
    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 = [];
    }

    //If no name, and callback is a function, then figure out if it a
    //CommonJS thing with dependencies.
    if (!deps.length && isFunction(callback)) {
      //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, "")
          .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);
      }
    }

    //If in IE 6-8 and hit an anonymous define() call, do the interactive
    //work.
    if (useInteractive) {
      node = currentlyAddingScript || getInteractiveScript();
      if (node) {
        if (!name) {
          name = node.getAttribute("data-requiremodule");
        }
        context = contexts[node.getAttribute("data-requirecontext")];
      }
    }

    //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.
    (context ? context.defQueue : globalDefQueue).push([name, deps, callback]);

    return undefined;
  };

  define.amd = {
    multiversion: true,
    plugins: true,
    jQuery: true
  };

  /**
   * Executes the text. Normally just uses eval, but can be modified
   * to use a more environment specific call.
   * @param {String} text the text to execute/evaluate.
   */
  req.exec = function (text) {
    return eval(text);
  };

  /**
   * Executes a module callack 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
   */
  req.execCb = function (name, callback, args, exports) {
    return callback.apply(exports, args);
  };


  /**
   * Adds a node to the DOM. Public function since used by the order plugin.
   * This method should not normally be called by outside code.
   */
  req.addScriptToDom = function (node) {
    //For some cache cases in IE 6-8, the script executes before the end
    //of the appendChild execution, so to tie an anonymous define
    //call to the module name (which is stored on the node), hold on
    //to a reference to this node, but clear after the DOM insertion.
    currentlyAddingScript = node;
    if (baseElement) {
      head.insertBefore(node, baseElement);
    } else {
      head.appendChild(node);
    }
    currentlyAddingScript = null;
  };

  /**
   * callback for script loads, used to check status of loading.
   *
   * @param {Event} evt the event from the browser for the script
   * that was loaded.
   *
   * @private
   */
  req.onScriptLoad = function (evt) {
    //Using currentTarget instead of target for Firefox 2.0's sake. Not
    //all old browsers will be supported, but this one was easy enough
    //to support and still makes sense.
    var node = evt.currentTarget || evt.srcElement, contextName, moduleName,
      context;

    if (evt.type === "load" || (node && readyRegExp.test(node.readyState))) {
      //Reset interactive script so a script node is not held onto for
      //to long.
      interactiveScript = null;

      //Pull out the name of the module and the context.
      contextName = node.getAttribute("data-requirecontext");
      moduleName = node.getAttribute("data-requiremodule");
      context = contexts[contextName];

      contexts[contextName].completeLoad(moduleName);

      //Clean up script binding. Favor detachEvent because of IE9
      //issue, see attachEvent/addEventListener comment elsewhere
      //in this file.
      if (node.detachEvent && !isOpera) {
        //Probably IE. If not it will throw an error, which will be
        //useful to know.
        node.detachEvent("onreadystatechange", req.onScriptLoad);
      } else {
        node.removeEventListener("load", req.onScriptLoad, false);
      }
    }
  };

  /**
   * Attaches the script represented by the URL to the current
   * environment. Right now only supports browser loading,
   * but can be redefined in other environments to do the right thing.
   * @param {String} url the url of the script to attach.
   * @param {Object} context the context that wants the script.
   * @param {moduleName} the name of the module that is associated with the script.
   * @param {Function} [callback] optional callback, defaults to require.onScriptLoad
   * @param {String} [type] optional type, defaults to text/javascript
   * @param {Function} [fetchOnlyFunction] optional function to indicate the script node
   * should be set up to fetch the script but do not attach it to the DOM
   * so that it can later be attached to execute it. This is a way for the
   * order plugin to support ordered loading in IE. Once the script is fetched,
   * but not executed, the fetchOnlyFunction will be called.
   */
  req.attach = function (url, context, moduleName, callback, type, fetchOnlyFunction) {
    var node;
    if (isBrowser) {
      //In the browser so use a script tag
      callback = callback || req.onScriptLoad;
      node = context && context.config && context.config.xhtml ?
        document.createElementNS("http://www.w3.org/1999/xhtml", "html:script") :
        document.createElement("script");
      node.type = type || (context && context.config.scriptType) ||
        "text/javascript";
      node.charset = "utf-8";
      //Use async so Gecko does not block on executing the script if something
      //like a long-polling comet tag is being run first. Gecko likes
      //to evaluate scripts in DOM order, even for dynamic scripts.
      //It will fetch them async, but only evaluate the contents in DOM
      //order, so a long-polling script tag can delay execution of scripts
      //after it. But telling Gecko we expect async gets us the behavior
      //we want -- execute it whenever it is finished downloading. Only
      //Helps Firefox 3.6+
      //Allow some URLs to not be fetched async. Mostly helps the order!
      //plugin
      node.async = !s.skipAsync[url];

      if (context) {
        node.setAttribute("data-requirecontext", context.contextName);
      }
      node.setAttribute("data-requiremodule", moduleName);

      //Set up load listener. Test attachEvent first because IE9 has
      //a subtle issue in its addEventListener and script onload firings
      //that do not match the behavior of all other browsers with
      //addEventListener support, which fire the onload event for a
      //script right after the script execution. See:
      //https://connect.microsoft.com/IE/feedback/details/648057/script-onload-event-is-not-fired-immediately-after-script-execution
      //UNFORTUNATELY Opera implements attachEvent but does not follow the script
      //script execution mode.
      if (node.attachEvent && !isOpera) {
        //Probably IE. IE (at least 6-8) do not fire
        //script onload right after executing the script, so
        //we cannot tie the anonymous define call to a name.
        //However, IE reports the script as being in "interactive"
        //readyState at the time of the define call.
        useInteractive = true;


        if (fetchOnlyFunction) {
          //Need to use old school onreadystate here since
          //when the event fires and the node is not attached
          //to the DOM, the evt.srcElement is null, so use
          //a closure to remember the node.
          node.onreadystatechange = function (evt) {
            //Script loaded but not executed.
            //Clear loaded handler, set the real one that
            //waits for script execution.
            if (node.readyState === 'loaded') {
              node.onreadystatechange = null;
              node.attachEvent("onreadystatechange", callback);
              fetchOnlyFunction(node);
            }
          };
        } else {
          node.attachEvent("onreadystatechange", callback);
        }
      } else {
        node.addEventListener("load", callback, false);
      }
      node.src = url;

      //Fetch only means waiting to attach to DOM after loaded.
      if (!fetchOnlyFunction) {
        req.addScriptToDom(node);
      }

      return node;
    } else if (isWebWorker) {
      //In a web worker, use importScripts. This is not a very
      //efficient use of importScripts, importScripts will block until
      //its script is downloaded and evaluated. However, if web workers
      //are in play, the expectation that a build has been done so that
      //only one script needs to be loaded anyway. This may need to be
      //reevaluated if other use cases become common.
      importScripts(url);

      //Account for anonymous modules
      context.completeLoad(moduleName);
    }
    return null;
  };

  //Look for a data-main script attribute, which could also adjust the baseUrl.
  if (isBrowser) {
    //Figure out baseUrl. Get it from the script tag with require.js in it.
    scripts = document.getElementsByTagName("script");

    for (globalI = scripts.length - 1; globalI > -1 && (script = scripts[globalI]); globalI--) {
      //Set the "head" where we can append children by
      //using the script's parent.
      if (!head) {
        head = script.parentNode;
      }

      //Look for a data-main attribute to set main script for the page
      //to load. If it is there, the path to data main becomes the
      //baseUrl, if it is not already set.
      if ((dataMain = script.getAttribute('data-main'))) {
        if (!cfg.baseUrl) {
          //Pull off the directory of data-main for use as the
          //baseUrl.
          src = dataMain.split('/');
          mainScript = src.pop();
          subPath = src.length ? src.join('/')  + '/' : './';

          //Set final config.
          cfg.baseUrl = subPath;
          //Strip off any trailing .js since dataMain is now
          //like a module name.
          dataMain = mainScript.replace(jsSuffixRegExp, '');
        }

        //Put the data-main script in the files to load.
        cfg.deps = cfg.deps ? cfg.deps.concat(dataMain) : [dataMain];

        break;
      }
    }
  }

  //See if there is nothing waiting across contexts, and if not, trigger
  //resourcesReady.
  req.checkReadyState = function () {
    var contexts = s.contexts, prop;
    for (prop in contexts) {
      if (!(prop in empty)) {
        if (contexts[prop].waitCount) {
          return;
        }
      }
    }
    req.resourcesReady(true);
  };

  /**
   * Internal function that is triggered whenever all scripts/resources
   * have been loaded by the loader. Can be overridden by other, for
   * instance the domReady plugin, which wants to know when all resources
   * are loaded.
   */
  req.resourcesReady = function (isReady) {
    var contexts, context, prop;

    //First, set the public variable indicating that resources are loading.
    req.resourcesDone = isReady;

    if (req.resourcesDone) {
      //If jQuery with DOM ready delayed, release it now.
      contexts = s.contexts;
      for (prop in contexts) {
        if (!(prop in empty)) {
          context = contexts[prop];
          if (context.jQueryIncremented) {
            jQueryHoldReady(context.jQuery, false);
            context.jQueryIncremented = false;
          }
        }
      }
    }
  };

  //FF < 3.6 readyState fix. Needed so that domReady plugin
  //works well in that environment, since require.js is normally
  //loaded via an HTML script tag so it will be there before window load,
  //where the domReady plugin is more likely to be loaded after window load.
  req.pageLoaded = function () {
    if (document.readyState !== "complete") {
      document.readyState = "complete";
    }
  };
  if (isBrowser) {
    if (document.addEventListener) {
      if (!document.readyState) {
        document.readyState = "loading";
        window.addEventListener("load", req.pageLoaded, false);
      }
    }
  }

  //Set up default context. If require was a configuration object, use that as base config.
  req(cfg);

  //If modules are built into require.js, then need to make sure dependencies are
  //traced. Use a setTimeout in the browser world, to allow all the modules to register
  //themselves. In a non-browser env, assume that modules are not built into require.js,
  //which seems odd to do on the server.
  if (req.isAsync && typeof setTimeout !== "undefined") {
    ctx = s.contexts[(cfg.context || defContextName)];
    //Indicate that the script that includes require() is still loading,
    //so that require()'d dependencies are not traced until the end of the
    //file is parsed (approximated via the setTimeout call).
    ctx.requireWait = true;
    setTimeout(function () {
      ctx.requireWait = false;

      if (!ctx.scriptCount) {
        ctx.resume();
      }
      req.checkReadyState();
    }, 0);
  }
}());