/*jslint forin: true, maxlen: 350 */
 
/**
 * Loader dynamically loads script and css files.  It includes the dependency
 * information for the version of the library in use, and will automatically pull in
 * dependencies for the modules requested. It can also load the
 * files from the Yahoo! CDN, and it can utilize the combo service provided on
 * this network to reduce the number of http connections required to download
 * YUI files.
 *
 * @module loader
 * @main loader
 * @submodule loader-base
 */
 
var NOT_FOUND = {},
    NO_REQUIREMENTS = [],
    MAX_URL_LENGTH = 1024,
    GLOBAL_ENV = YUI.Env,
    GLOBAL_LOADED = GLOBAL_ENV._loaded,
    CSS = 'css',
    JS = 'js',
    INTL = 'intl',
    DEFAULT_SKIN = 'sam',
    VERSION = Y.version,
    ROOT_LANG = '',
    YObject = Y.Object,
    oeach = YObject.each,
    yArray = Y.Array,
    _queue = GLOBAL_ENV._loaderQueue,
    META = GLOBAL_ENV[VERSION],
    SKIN_PREFIX = 'skin-',
    L = Y.Lang,
    ON_PAGE = GLOBAL_ENV.mods,
    modulekey,
    _path = function(dir, file, type, nomin) {
        var path = dir + '/' + file;
        if (!nomin) {
            path += '-min';
        }
        path += '.' + (type || CSS);
 
        return path;
    };
 
 
    if (!YUI.Env._cssLoaded) {
        YUI.Env._cssLoaded = {};
    }
 
 
/**
 * The component metadata is stored in Y.Env.meta.
 * Part of the loader module.
 * @property meta
 * @for YUI
 */
Y.Env.meta = META;
 
/**
 * Loader dynamically loads script and css files.  It includes the dependency
 * info for the version of the library in use, and will automatically pull in
 * dependencies for the modules requested. It can load the
 * files from the Yahoo! CDN, and it can utilize the combo service provided on
 * this network to reduce the number of http connections required to download
 * YUI files. You can also specify an external, custom combo service to host
 * your modules as well.
 
        var Y = YUI();
        var loader = new Y.Loader({
            filter: 'debug',
            base: '../../',
            root: 'build/',
            combine: true,
            require: ['node', 'dd', 'console']
        });
        var out = loader.resolve(true);
 
 * @constructor
 * @class Loader
 * @param {Object} config an optional set of configuration options.
 * @param {String} config.base The base dir which to fetch this module from
 * @param {String} config.comboBase The Combo service base path. Ex: `http://yui.yahooapis.com/combo?`
 * @param {String} config.root The root path to prepend to module names for the combo service. Ex: `2.5.2/build/`
 * @param {String|Object} config.filter A filter to apply to result urls. <a href="#property_filter">See filter property</a>
 * @param {Object} config.filters Per-component filter specification.  If specified for a given component, this overrides the filter config.
 * @param {Boolean} config.combine Use a combo service to reduce the number of http connections required to load your dependencies
 * @param {Boolean} [config.async=true] Fetch files in async
 * @param {Array} config.ignore: A list of modules that should never be dynamically loaded
 * @param {Array} config.force A list of modules that should always be loaded when required, even if already present on the page
 * @param {HTMLElement|String} config.insertBefore Node or id for a node that should be used as the insertion point for new nodes
 * @param {Object} config.jsAttributes Object literal containing attributes to add to script nodes
 * @param {Object} config.cssAttributes Object literal containing attributes to add to link nodes
 * @param {Number} config.timeout The number of milliseconds before a timeout occurs when dynamically loading nodes.  If not set, there is no timeout
 * @param {Object} config.context Execution context for all callbacks
 * @param {Function} config.onSuccess Callback for the 'success' event
 * @param {Function} config.onFailure Callback for the 'failure' event
 * @param {Function} config.onCSS Callback for the 'CSSComplete' event.  When loading YUI components with CSS the CSS is loaded first, then the script.  This provides a moment you can tie into to improve the presentation of the page while the script is loading.
 * @param {Function} config.onTimeout Callback for the 'timeout' event
 * @param {Function} config.onProgress Callback executed each time a script or css file is loaded
 * @param {Object} config.modules A list of module definitions.  See <a href="#method_addModule">Loader.addModule</a> for the supported module metadata
 * @param {Object} config.groups A list of group definitions.  Each group can contain specific definitions for `base`, `comboBase`, `combine`, and accepts a list of `modules`.
 * @param {String} config.2in3 The version of the YUI 2 in 3 wrapper to use.  The intrinsic support for YUI 2 modules in YUI 3 relies on versions of the YUI 2 components inside YUI 3 module wrappers.  These wrappers change over time to accomodate the issues that arise from running YUI 2 in a YUI 3 sandbox.
 * @param {String} config.yui2 When using the 2in3 project, you can select the version of YUI 2 to use.  Valid values are `2.2.2`, `2.3.1`, `2.4.1`, `2.5.2`, `2.6.0`, `2.7.0`, `2.8.0`, `2.8.1` and `2.9.0` [default] -- plus all versions of YUI 2 going forward.
 */
Y.Loader = function(o) {
 
    var self = this;
 
    //Catch no config passed.
    o = o || {};
 
    modulekey = META.md5;
 
    /**
     * Internal callback to handle multiple internal insert() calls
     * so that css is inserted prior to js
     * @property _internalCallback
     * @private
     */
    // self._internalCallback = null;
 
    /**
     * Callback that will be executed when the loader is finished
     * with an insert
     * @method onSuccess
     * @type function
     */
    // self.onSuccess = null;
 
    /**
     * Callback that will be executed if there is a failure
     * @method onFailure
     * @type function
     */
    // self.onFailure = null;
 
    /**
     * Callback for the 'CSSComplete' event.  When loading YUI components
     * with CSS the CSS is loaded first, then the script.  This provides
     * a moment you can tie into to improve the presentation of the page
     * while the script is loading.
     * @method onCSS
     * @type function
     */
    // self.onCSS = null;
 
    /**
     * Callback executed each time a script or css file is loaded
     * @method onProgress
     * @type function
     */
    // self.onProgress = null;
 
    /**
     * Callback that will be executed if a timeout occurs
     * @method onTimeout
     * @type function
     */
    // self.onTimeout = null;
 
    /**
     * The execution context for all callbacks
     * @property context
     * @default {YUI} the YUI instance
     */
    self.context = Y;
 
    /**
     * Data that is passed to all callbacks
     * @property data
     */
    // self.data = null;
 
    /**
     * Node reference or id where new nodes should be inserted before
     * @property insertBefore
     * @type string|HTMLElement
     */
    // self.insertBefore = null;
 
    /**
     * The charset attribute for inserted nodes
     * @property charset
     * @type string
     * @deprecated , use cssAttributes or jsAttributes.
     */
    // self.charset = null;
 
    /**
     * An object literal containing attributes to add to link nodes
     * @property cssAttributes
     * @type object
     */
    // self.cssAttributes = null;
 
    /**
     * An object literal containing attributes to add to script nodes
     * @property jsAttributes
     * @type object
     */
    // self.jsAttributes = null;
 
    /**
     * The base directory.
     * @property base
     * @type string
     * @default http://yui.yahooapis.com/[YUI VERSION]/build/
     */
    self.base = Y.Env.meta.base + Y.Env.meta.root;
 
    /**
     * Base path for the combo service
     * @property comboBase
     * @type string
     * @default http://yui.yahooapis.com/combo?
     */
    self.comboBase = Y.Env.meta.comboBase;
 
    /*
     * Base path for language packs.
     */
    // self.langBase = Y.Env.meta.langBase;
    // self.lang = "";
 
    /**
     * If configured, the loader will attempt to use the combo
     * service for YUI resources and configured external resources.
     * @property combine
     * @type boolean
     * @default true if a base dir isn't in the config
     */
    self.combine = o.base &&
        (o.base.indexOf(self.comboBase.substr(0, 20)) > -1);
 
    /**
    * The default seperator to use between files in a combo URL
    * @property comboSep
    * @type {String}
    * @default Ampersand
    */
    self.comboSep = '&';
    /**
     * Max url length for combo urls.  The default is 1024. This is the URL
     * limit for the Yahoo! hosted combo servers.  If consuming
     * a different combo service that has a different URL limit
     * it is possible to override this default by supplying
     * the maxURLLength config option.  The config option will
     * only take effect if lower than the default.
     *
     * @property maxURLLength
     * @type int
     */
    self.maxURLLength = MAX_URL_LENGTH;
 
    /**
     * Ignore modules registered on the YUI global
     * @property ignoreRegistered
     * @default false
     */
    self.ignoreRegistered = o.ignoreRegistered;
 
    /**
     * Root path to prepend to module path for the combo
     * service
     * @property root
     * @type string
     * @default [YUI VERSION]/build/
     */
    self.root = Y.Env.meta.root;
 
    /**
     * Timeout value in milliseconds.  If set, self value will be used by
     * the get utility.  the timeout event will fire if
     * a timeout occurs.
     * @property timeout
     * @type int
     */
    self.timeout = 0;
 
    /**
     * A list of modules that should not be loaded, even if
     * they turn up in the dependency tree
     * @property ignore
     * @type string[]
     */
    // self.ignore = null;
 
    /**
     * A list of modules that should always be loaded, even
     * if they have already been inserted into the page.
     * @property force
     * @type string[]
     */
    // self.force = null;
 
    self.forceMap = {};
 
    /**
     * Should we allow rollups
     * @property allowRollup
     * @type boolean
     * @default false
     */
    self.allowRollup = false;
 
    /**
     * A filter to apply to result urls.  This filter will modify the default
     * path for all modules.  The default path for the YUI library is the
     * minified version of the files (e.g., event-min.js).  The filter property
     * can be a predefined filter or a custom filter.  The valid predefined
     * filters are:
     * <dl>
     *  <dt>DEBUG</dt>
     *  <dd>Selects the debug versions of the library (e.g., event-debug.js).
     *      This option will automatically include the Logger widget</dd>
     *  <dt>RAW</dt>
     *  <dd>Selects the non-minified version of the library (e.g., event.js).
     *  </dd>
     * </dl>
     * You can also define a custom filter, which must be an object literal
     * containing a search expression and a replace string:
     *
     *      myFilter: {
     *          'searchExp': "-min\\.js",
     *          'replaceStr': "-debug.js"
     *      }
     *
     * @property filter
     * @type string| {searchExp: string, replaceStr: string}
     */
    // self.filter = null;
 
    /**
     * per-component filter specification.  If specified for a given
     * component, this overrides the filter config.
     * @property filters
     * @type object
     */
    self.filters = {};
 
    /**
     * The list of requested modules
     * @property required
     * @type {string: boolean}
     */
    self.required = {};
 
    /**
     * If a module name is predefined when requested, it is checked againsts
     * the patterns provided in this property.  If there is a match, the
     * module is added with the default configuration.
     *
     * At the moment only supporting module prefixes, but anticipate
     * supporting at least regular expressions.
     * @property patterns
     * @type Object
     */
    // self.patterns = Y.merge(Y.Env.meta.patterns);
    self.patterns = {};
 
    /**
     * The library metadata
     * @property moduleInfo
     */
    // self.moduleInfo = Y.merge(Y.Env.meta.moduleInfo);
    self.moduleInfo = {};
 
    self.groups = Y.merge(Y.Env.meta.groups);
 
    /**
     * Provides the information used to skin the skinnable components.
     * The following skin definition would result in 'skin1' and 'skin2'
     * being loaded for calendar (if calendar was requested), and
     * 'sam' for all other skinnable components:
     *
     *      skin: {
     *          // The default skin, which is automatically applied if not
     *          // overriden by a component-specific skin definition.
     *          // Change this in to apply a different skin globally
     *          defaultSkin: 'sam',
     *
     *          // This is combined with the loader base property to get
     *          // the default root directory for a skin. ex:
     *          // http://yui.yahooapis.com/2.3.0/build/assets/skins/sam/
     *          base: 'assets/skins/',
     *
     *          // Any component-specific overrides can be specified here,
     *          // making it possible to load different skins for different
     *          // components.  It is possible to load more than one skin
     *          // for a given component as well.
     *          overrides: {
     *              calendar: ['skin1', 'skin2']
     *          }
     *      }
     * @property skin
     * @type {Object}
     */
    self.skin = Y.merge(Y.Env.meta.skin);
 
    /*
     * Map of conditional modules
     * @since 3.2.0
     */
    self.conditions = {};
 
    // map of modules with a hash of modules that meet the requirement
    // self.provides = {};
 
    self.config = o;
    self._internal = true;
 
    self._populateCache();
 
    /**
     * Set when beginning to compute the dependency tree.
     * Composed of what YUI reports to be loaded combined
     * with what has been loaded by any instance on the page
     * with the version number specified in the metadata.
     * @property loaded
     * @type {string: boolean}
     */
    self.loaded = GLOBAL_LOADED[VERSION];
 
 
    /**
    * Should Loader fetch scripts in `async`, defaults to `true`
    * @property async
    */
 
    self.async = true;
 
    self._inspectPage();
 
    self._internal = false;
 
    self._config(o);
 
    self.forceMap = (self.force) ? Y.Array.hash(self.force) : {};
 
    self.testresults = null;
 
    if (Y.config.tests) {
        self.testresults = Y.config.tests;
    }
 
    /**
     * List of rollup files found in the library metadata
     * @property rollups
     */
    // self.rollups = null;
 
    /**
     * Whether or not to load optional dependencies for
     * the requested modules
     * @property loadOptional
     * @type boolean
     * @default false
     */
    // self.loadOptional = false;
 
    /**
     * All of the derived dependencies in sorted order, which
     * will be populated when either calculate() or insert()
     * is called
     * @property sorted
     * @type string[]
     */
    self.sorted = [];
 
    /*
     * A list of modules to attach to the YUI instance when complete.
     * If not supplied, the sorted list of dependencies are applied.
     * @property attaching
     */
    // self.attaching = null;
 
    /**
     * Flag to indicate the dependency tree needs to be recomputed
     * if insert is called again.
     * @property dirty
     * @type boolean
     * @default true
     */
    self.dirty = true;
 
    /**
     * List of modules inserted by the utility
     * @property inserted
     * @type {string: boolean}
     */
    self.inserted = {};
 
    /**
     * List of skipped modules during insert() because the module
     * was not defined
     * @property skipped
     */
    self.skipped = {};
 
    // Y.on('yui:load', self.loadNext, self);
 
    self.tested = {};
 
    /*
     * Cached sorted calculate results
     * @property results
     * @since 3.2.0
     */
    //self.results = {};
 
    if (self.ignoreRegistered) {
        //Clear inpage already processed modules.
        self._resetModules();
    }
 
};
 
Y.Loader.prototype = {
    /**
    * Checks the cache for modules and conditions, if they do not exist
    * process the default metadata and populate the local moduleInfo hash.
    * @method _populateCache
    * @private
    */
    _populateCache: function() {
        var self = this,
            defaults = META.modules,
            cache = GLOBAL_ENV._renderedMods,
            i;
 
        if (cache && !self.ignoreRegistered) {
            for (i in cache) {
                if (cache.hasOwnProperty(i)) {
                    self.moduleInfo[i] = Y.merge(cache[i]);
                }
            }
 
            cache = GLOBAL_ENV._conditions;
            for (i in cache) {
                if (cache.hasOwnProperty(i)) {
                    self.conditions[i] = Y.merge(cache[i]);
                }
            }
 
        } else {
            for (i in defaults) {
                if (defaults.hasOwnProperty(i)) {
                    self.addModule(defaults[i], i);
                }
            }
        }
 
    },
    /**
    * Reset modules in the module cache to a pre-processed state so additional
    * computations with a different skin or language will work as expected.
    * @method _resetModules
    * @private
    */
    _resetModules: function() {
        var self = this, i, o,
            mod, name, details;
        for (i in self.moduleInfo) {
            if (self.moduleInfo.hasOwnProperty(i)) {
                mod = self.moduleInfo[i];
                name = mod.name;
                details  = (YUI.Env.mods[name] ? YUI.Env.mods[name].details : null);
 
                if (details) {
                    self.moduleInfo[name]._reset = true;
                    self.moduleInfo[name].requires = details.requires || [];
                    self.moduleInfo[name].optional = details.optional || [];
                    self.moduleInfo[name].supersedes = details.supercedes || [];
                }
 
                if (mod.defaults) {
                    for (o in mod.defaults) {
                        if (mod.defaults.hasOwnProperty(o)) {
                            if (mod[o]) {
                                mod[o] = mod.defaults[o];
                            }
                        }
                    }
                }
                delete mod.langCache;
                delete mod.skinCache;
                if (mod.skinnable) {
                    self._addSkin(self.skin.defaultSkin, mod.name);
                }
            }
        }
    },
    /**
    Regex that matches a CSS URL. Used to guess the file type when it's not
    specified.
 
    @property REGEX_CSS
    @type RegExp
    @final
    @protected
    @since 3.5.0
    **/
    REGEX_CSS: /\.css(?:[?;].*)?$/i,
 
    /**
    * Default filters for raw and debug
    * @property FILTER_DEFS
    * @type Object
    * @final
    * @protected
    */
    FILTER_DEFS: {
        RAW: {
            'searchExp': '-min\\.js',
            'replaceStr': '.js'
        },
        DEBUG: {
            'searchExp': '-min\\.js',
            'replaceStr': '-debug.js'
        },
        COVERAGE: {
            'searchExp': '-min\\.js',
            'replaceStr': '-coverage.js'
        }
    },
    /*
    * Check the pages meta-data and cache the result.
    * @method _inspectPage
    * @private
    */
    _inspectPage: function() {
        var self = this, v, m, req, mr, i;
 
        //Inspect the page for CSS only modules and mark them as loaded.
        for (i in self.moduleInfo) {
            if (self.moduleInfo.hasOwnProperty(i)) {
                v = self.moduleInfo[i];
                if (v.type && v.type === CSS) {
                    if (self.isCSSLoaded(v.name)) {
                        Y.log('Found CSS module on page: ' + v.name, 'info', 'loader');
                        self.loaded[i] = true;
                    }
                }
            }
        }
        for (i in ON_PAGE) {
            if (ON_PAGE.hasOwnProperty(i)) {
                v = ON_PAGE[i];
                if (v.details) {
                    m = self.moduleInfo[v.name];
                    req = v.details.requires;
                    mr = m && m.requires;
 
                   if (m) {
                       if (!m._inspected && req && mr.length !== req.length) {
                           // console.log('deleting ' + m.name);
                           delete m.expanded;
                       }
                   } else {
                       m = self.addModule(v.details, i);
                   }
                   m._inspected = true;
               }
            }
        }
    },
    /*
    * returns true if b is not loaded, and is required directly or by means of modules it supersedes.
    * @private
    * @method _requires
    * @param {String} mod1 The first module to compare
    * @param {String} mod2 The second module to compare
    */
   _requires: function(mod1, mod2) {
 
        var i, rm, after_map, s,
            info = this.moduleInfo,
            m = info[mod1],
            other = info[mod2];
 
        if (!m || !other) {
            return false;
        }
 
        rm = m.expanded_map;
        after_map = m.after_map;
 
        // check if this module should be sorted after the other
        // do this first to short circut circular deps
        if (after_map && (mod2 in after_map)) {
            return true;
        }
 
        after_map = other.after_map;
 
        // and vis-versa
        if (after_map && (mod1 in after_map)) {
            return false;
        }
 
        // check if this module requires one the other supersedes
        s = info[mod2] && info[mod2].supersedes;
        if (s) {
            for (i = 0; i < s.length; i++) {
                if (this._requires(mod1, s[i])) {
                    return true;
                }
            }
        }
 
        s = info[mod1] && info[mod1].supersedes;
        if (s) {
            for (i = 0; i < s.length; i++) {
                if (this._requires(mod2, s[i])) {
                    return false;
                }
            }
        }
 
        // check if this module requires the other directly
        // if (r && yArray.indexOf(r, mod2) > -1) {
        if (rm && (mod2 in rm)) {
            return true;
        }
 
        // external css files should be sorted below yui css
        if (m.ext && m.type === CSS && !other.ext && other.type === CSS) {
            return true;
        }
 
        return false;
    },
    /**
    * Apply a new config to the Loader instance
    * @method _config
    * @private
    * @param {Object} o The new configuration
    */
    _config: function(o) {
        var i, j, val, a, f, group, groupName, self = this,
            mods = [], mod;
        // apply config values
        if (o) {
            for (i in o) {
                if (o.hasOwnProperty(i)) {
                    val = o[i];
                    //TODO This should be a case
                    if (i === 'require') {
                        self.require(val);
                    } else if (i === 'skin') {
                        //If the config.skin is a string, format to the expected object
                        if (typeof val === 'string') {
                            self.skin.defaultSkin = o.skin;
                            val = {
                                defaultSkin: val
                            };
                        }
 
                        Y.mix(self.skin, val, true);
                    } else if (i === 'groups') {
                        for (j in val) {
                            if (val.hasOwnProperty(j)) {
                                // Y.log('group: ' + j);
                                groupName = j;
                                group = val[j];
                                self.addGroup(group, groupName);
                                if (group.aliases) {
                                    for (a in group.aliases) {
                                        if (group.aliases.hasOwnProperty(a)) {
                                            self.addAlias(group.aliases[a], a);
                                        }
                                    }
                                }
                            }
                        }
 
                    } else if (i === 'modules') {
                        // add a hash of module definitions
                        for (j in val) {
                            if (val.hasOwnProperty(j)) {
                                self.addModule(val[j], j);
                            }
                        }
                    } else if (i === 'aliases') {
                        for (j in val) {
                            if (val.hasOwnProperty(j)) {
                                self.addAlias(val[j], j);
                            }
                        }
                    } else if (i === 'gallery') {
                        if (this.groups.gallery.update) {
                            this.groups.gallery.update(val, o);
                        }
                    } else if (i === 'yui2' || i === '2in3') {
                        if (this.groups.yui2.update) {
                            this.groups.yui2.update(o['2in3'], o.yui2, o);
                        }
                    } else {
                        self[i] = val;
                    }
                }
            }
        }
 
        // fix filter
        f = self.filter;
 
        if (L.isString(f)) {
            f = f.toUpperCase();
            self.filterName = f;
            self.filter = self.FILTER_DEFS[f];
            if (f === 'DEBUG') {
                self.require('yui-log', 'dump');
            }
        }
 
        if (self.filterName && self.coverage) {
            if (self.filterName === 'COVERAGE' && L.isArray(self.coverage) && self.coverage.length) {
                for (i = 0; i < self.coverage.length; i++) {
                    mod = self.coverage[i];
                    if (self.moduleInfo[mod] && self.moduleInfo[mod].use) {
                        mods = [].concat(mods, self.moduleInfo[mod].use);
                    } else {
                        mods.push(mod);
                    }
                }
                self.filters = self.filters || {};
                Y.Array.each(mods, function(mod) {
                    self.filters[mod] = self.FILTER_DEFS.COVERAGE;
                });
                self.filterName = 'RAW';
                self.filter = self.FILTER_DEFS[self.filterName];
            }
        }
 
    },
 
    /**
     * Returns the skin module name for the specified skin name.  If a
     * module name is supplied, the returned skin module name is
     * specific to the module passed in.
     * @method formatSkin
     * @param {string} skin the name of the skin.
     * @param {string} mod optional: the name of a module to skin.
     * @return {string} the full skin module name.
     */
    formatSkin: function(skin, mod) {
        var s = SKIN_PREFIX + skin;
        if (mod) {
            s = s + '-' + mod;
        }
 
        return s;
    },
 
    /**
     * Adds the skin def to the module info
     * @method _addSkin
     * @param {string} skin the name of the skin.
     * @param {string} mod the name of the module.
     * @param {string} parent parent module if this is a skin of a
     * submodule or plugin.
     * @return {string} the module name for the skin.
     * @private
     */
    _addSkin: function(skin, mod, parent) {
        var mdef, pkg, name, nmod,
            info = this.moduleInfo,
            sinf = this.skin,
            ext = info[mod] && info[mod].ext;
 
        // Add a module definition for the module-specific skin css
        if (mod) {
            name = this.formatSkin(skin, mod);
            if (!info[name]) {
                mdef = info[mod];
                pkg = mdef.pkg || mod;
                nmod = {
                    skin: true,
                    name: name,
                    group: mdef.group,
                    type: 'css',
                    after: sinf.after,
                    path: (parent || pkg) + '/' + sinf.base + skin +
                          '/' + mod + '.css',
                    ext: ext
                };
                if (mdef.base) {
                    nmod.base = mdef.base;
                }
                if (mdef.configFn) {
                    nmod.configFn = mdef.configFn;
                }
                this.addModule(nmod, name);
 
                Y.log('Adding skin (' + name + '), ' + parent + ', ' + pkg + ', ' + info[name].path, 'info', 'loader');
            }
        }
 
        return name;
    },
    /**
    * Adds an alias module to the system
    * @method addAlias
    * @param {Array} use An array of modules that makes up this alias
    * @param {String} name The name of the alias
    * @example
    *       var loader = new Y.Loader({});
    *       loader.addAlias([ 'node', 'yql' ], 'davglass');
    *       loader.require(['davglass']);
    *       var out = loader.resolve(true);
    *
    *       //out.js will contain Node and YQL modules
    */
    addAlias: function(use, name) {
        YUI.Env.aliases[name] = use;
        this.addModule({
            name: name,
            use: use
        });
    },
    /**
     * Add a new module group
     * @method addGroup
     * @param {Object} config An object containing the group configuration data
     * @param {String} config.name required, the group name
     * @param {String} config.base The base directory for this module group
     * @param {String} config.root The root path to add to each combo resource path
     * @param {Boolean} config.combine Should the request be combined
     * @param {String} config.comboBase Combo service base path
     * @param {Object} config.modules The group of modules
     * @param {String} name the group name.
     * @example
     *      var loader = new Y.Loader({});
     *      loader.addGroup({
     *          name: 'davglass',
     *          combine: true,
     *          comboBase: '/combo?',
     *          root: '',
     *          modules: {
     *              //Module List here
     *          }
     *      }, 'davglass');
     */
    addGroup: function(o, name) {
        var mods = o.modules,
            self = this, i, v;
 
        name = name || o.name;
        o.name = name;
        self.groups[name] = o;
 
        if (o.patterns) {
            for (i in o.patterns) {
                if (o.patterns.hasOwnProperty(i)) {
                    o.patterns[i].group = name;
                    self.patterns[i] = o.patterns[i];
                }
            }
        }
 
        if (mods) {
            for (i in mods) {
                if (mods.hasOwnProperty(i)) {
                    v = mods[i];
                    if (typeof v === 'string') {
                        v = { name: i, fullpath: v };
                    }
                    v.group = name;
                    self.addModule(v, i);
                }
            }
        }
    },
 
    /**
     * Add a new module to the component metadata.
     * @method addModule
     * @param {Object} config An object containing the module data.
     * @param {String} config.name Required, the component name
     * @param {String} config.type Required, the component type (js or css)
     * @param {String} config.path Required, the path to the script from `base`
     * @param {Array} config.requires Array of modules required by this component
     * @param {Array} [config.optional] Array of optional modules for this component
     * @param {Array} [config.supersedes] Array of the modules this component replaces
     * @param {Array} [config.after] Array of modules the components which, if present, should be sorted above this one
     * @param {Object} [config.after_map] Faster alternative to 'after' -- supply a hash instead of an array
     * @param {Number} [config.rollup] The number of superseded modules required for automatic rollup
     * @param {String} [config.fullpath] If `fullpath` is specified, this is used instead of the configured `base + path`
     * @param {Boolean} [config.skinnable] Flag to determine if skin assets should automatically be pulled in
     * @param {Object} [config.submodules] Hash of submodules
     * @param {String} [config.group] The group the module belongs to -- this is set automatically when it is added as part of a group configuration.
     * @param {Array} [config.lang] Array of BCP 47 language tags of languages for which this module has localized resource bundles, e.g., `["en-GB", "zh-Hans-CN"]`
     * @param {Object} [config.condition] Specifies that the module should be loaded automatically if a condition is met. This is an object with up to four fields:
     * @param {String} [config.condition.trigger] The name of a module that can trigger the auto-load
     * @param {Function} [config.condition.test] A function that returns true when the module is to be loaded.
     * @param {String} [config.condition.ua] The UA name of <a href="UA.html">Y.UA</a> object that returns true when the module is to be loaded. e.g., `"ie"`, `"nodejs"`.
     * @param {String} [config.condition.when] Specifies the load order of the conditional module
     *  with regard to the position of the trigger module.
     *  This should be one of three values: `before`, `after`, or `instead`.  The default is `after`.
     * @param {Object} [config.testresults] A hash of test results from `Y.Features.all()`
     * @param {Function} [config.configFn] A function to exectute when configuring this module
     * @param {Object} config.configFn.mod The module config, modifying this object will modify it's config. Returning false will delete the module's config.
     * @param {String} [name] The module name, required if not in the module data.
     * @return {Object} the module definition or null if the object passed in did not provide all required attributes.
     */
    addModule: function(o, name) {
        name = name || o.name;
 
        if (typeof o === 'string') {
            o = { name: name, fullpath: o };
        }
 
 
        var subs, i, l, t, sup, s, smod, plugins, plug,
            j, langs, packName, supName, flatSup, flatLang, lang, ret,
            overrides, skinname, when, g, p,
            conditions = this.conditions, trigger;
 
        //Only merge this data if the temp flag is set
        //from an earlier pass from a pattern or else
        //an override module (YUI_config) can not be used to
        //replace a default module.
        if (this.moduleInfo[name] && this.moduleInfo[name].temp) {
            //This catches temp modules loaded via a pattern
            // The module will be added twice, once from the pattern and
            // Once from the actual add call, this ensures that properties
            // that were added to the module the first time around (group: gallery)
            // are also added the second time around too.
            o = Y.merge(this.moduleInfo[name], o);
        }
 
        o.name = name;
 
        if (!o || !o.name) {
            return null;
        }
 
        if (!o.type) {
            //Always assume it's javascript unless the CSS pattern is matched.
            o.type = JS;
            p = o.path || o.fullpath;
            if (p && this.REGEX_CSS.test(p)) {
                Y.log('Auto determined module type as CSS', 'warn', 'loader');
                o.type = CSS;
            }
        }
 
        if (!o.path && !o.fullpath) {
            o.path = _path(name, name, o.type);
        }
        o.supersedes = o.supersedes || o.use;
 
        o.ext = ('ext' in o) ? o.ext : (this._internal) ? false : true;
 
        // Handle submodule logic
        subs = o.submodules;
 
        this.moduleInfo[name] = o;
 
        o.requires = o.requires || [];
 
        /*
        Only allowing the cascade of requires information, since
        optional and supersedes are far more fine grained than
        a blanket requires is.
        */
        if (this.requires) {
            for (i = 0; i < this.requires.length; i++) {
                o.requires.push(this.requires[i]);
            }
        }
        if (o.group && this.groups && this.groups[o.group]) {
            g = this.groups[o.group];
            if (g.requires) {
                for (i = 0; i < g.requires.length; i++) {
                    o.requires.push(g.requires[i]);
                }
            }
        }
 
 
        if (!o.defaults) {
            o.defaults = {
                requires: o.requires ? [].concat(o.requires) : null,
                supersedes: o.supersedes ? [].concat(o.supersedes) : null,
                optional: o.optional ? [].concat(o.optional) : null
            };
        }
 
        if (o.skinnable && o.ext && o.temp) {
            skinname = this._addSkin(this.skin.defaultSkin, name);
            o.requires.unshift(skinname);
        }
 
        if (o.requires.length) {
            o.requires = this.filterRequires(o.requires) || [];
        }
 
        if (!o.langPack && o.lang) {
            langs = yArray(o.lang);
            for (j = 0; j < langs.length; j++) {
                lang = langs[j];
                packName = this.getLangPackName(lang, name);
                smod = this.moduleInfo[packName];
                if (!smod) {
                    smod = this._addLangPack(lang, o, packName);
                }
            }
        }
 
 
        if (subs) {
            sup = o.supersedes || [];
            l = 0;
 
            for (i in subs) {
                if (subs.hasOwnProperty(i)) {
                    s = subs[i];
 
                    s.path = s.path || _path(name, i, o.type);
                    s.pkg = name;
                    s.group = o.group;
 
                    if (s.supersedes) {
                        sup = sup.concat(s.supersedes);
                    }
 
                    smod = this.addModule(s, i);
                    sup.push(i);
 
                    if (smod.skinnable) {
                        o.skinnable = true;
                        overrides = this.skin.overrides;
                        if (overrides && overrides[i]) {
                            for (j = 0; j < overrides[i].length; j++) {
                                skinname = this._addSkin(overrides[i][j],
                                         i, name);
                                sup.push(skinname);
                            }
                        }
                        skinname = this._addSkin(this.skin.defaultSkin,
                                        i, name);
                        sup.push(skinname);
                    }
 
                    // looks like we are expected to work out the metadata
                    // for the parent module language packs from what is
                    // specified in the child modules.
                    if (s.lang && s.lang.length) {
 
                        langs = yArray(s.lang);
                        for (j = 0; j < langs.length; j++) {
                            lang = langs[j];
                            packName = this.getLangPackName(lang, name);
                            supName = this.getLangPackName(lang, i);
                            smod = this.moduleInfo[packName];
 
                            if (!smod) {
                                smod = this._addLangPack(lang, o, packName);
                            }
 
                            flatSup = flatSup || yArray.hash(smod.supersedes);
 
                            if (!(supName in flatSup)) {
                                smod.supersedes.push(supName);
                            }
 
                            o.lang = o.lang || [];
 
                            flatLang = flatLang || yArray.hash(o.lang);
 
                            if (!(lang in flatLang)) {
                                o.lang.push(lang);
                            }
 
// Y.log('pack ' + packName + ' should supersede ' + supName);
// Add rollup file, need to add to supersedes list too
 
                            // default packages
                            packName = this.getLangPackName(ROOT_LANG, name);
                            supName = this.getLangPackName(ROOT_LANG, i);
 
                            smod = this.moduleInfo[packName];
 
                            if (!smod) {
                                smod = this._addLangPack(lang, o, packName);
                            }
 
                            if (!(supName in flatSup)) {
                                smod.supersedes.push(supName);
                            }
 
// Y.log('pack ' + packName + ' should supersede ' + supName);
// Add rollup file, need to add to supersedes list too
 
                        }
                    }
 
                    l++;
                }
            }
            //o.supersedes = YObject.keys(yArray.hash(sup));
            o.supersedes = yArray.dedupe(sup);
            if (this.allowRollup) {
                o.rollup = (l < 4) ? l : Math.min(l - 1, 4);
            }
        }
 
        plugins = o.plugins;
        if (plugins) {
            for (i in plugins) {
                if (plugins.hasOwnProperty(i)) {
                    plug = plugins[i];
                    plug.pkg = name;
                    plug.path = plug.path || _path(name, i, o.type);
                    plug.requires = plug.requires || [];
                    plug.group = o.group;
                    this.addModule(plug, i);
                    if (o.skinnable) {
                        this._addSkin(this.skin.defaultSkin, i, name);
                    }
 
                }
            }
        }
 
        if (o.condition) {
            t = o.condition.trigger;
            if (YUI.Env.aliases[t]) {
                t = YUI.Env.aliases[t];
            }
            if (!Y.Lang.isArray(t)) {
                t = [t];
            }
 
            for (i = 0; i < t.length; i++) {
                trigger = t[i];
                when = o.condition.when;
                conditions[trigger] = conditions[trigger] || {};
                conditions[trigger][name] = o.condition;
                // the 'when' attribute can be 'before', 'after', or 'instead'
                // the default is after.
                if (when && when !== 'after') {
                    if (when === 'instead') { // replace the trigger
                        o.supersedes = o.supersedes || [];
                        o.supersedes.push(trigger);
                    }
                    // before the trigger
                        // the trigger requires the conditional mod,
                        // so it should appear before the conditional
                        // mod if we do not intersede.
                } else { // after the trigger
                    o.after = o.after || [];
                    o.after.push(trigger);
                }
            }
        }
 
        if (o.supersedes) {
            o.supersedes = this.filterRequires(o.supersedes);
        }
 
        if (o.after) {
            o.after = this.filterRequires(o.after);
            o.after_map = yArray.hash(o.after);
        }
 
        // this.dirty = true;
 
        if (o.configFn) {
            ret = o.configFn(o);
            if (ret === false) {
                Y.log('Config function returned false for ' + name + ', skipping.', 'info', 'loader');
                delete this.moduleInfo[name];
                delete GLOBAL_ENV._renderedMods[name];
                o = null;
            }
        }
        //Add to global cache
        if (o) {
            if (!GLOBAL_ENV._renderedMods) {
                GLOBAL_ENV._renderedMods = {};
            }
            GLOBAL_ENV._renderedMods[name] = Y.mix(GLOBAL_ENV._renderedMods[name] || {}, o);
            GLOBAL_ENV._conditions = conditions;
        }
 
        return o;
    },
 
    /**
     * Add a requirement for one or more module
     * @method require
     * @param {string[] | string*} what the modules to load.
     */
    require: function(what) {
        var a = (typeof what === 'string') ? yArray(arguments) : what;
        this.dirty = true;
        this.required = Y.merge(this.required, yArray.hash(this.filterRequires(a)));
 
        this._explodeRollups();
    },
    /**
    * Grab all the items that were asked for, check to see if the Loader
    * meta-data contains a "use" array. If it doesm remove the asked item and replace it with
    * the content of the "use".
    * This will make asking for: "dd"
    * Actually ask for: "dd-ddm-base,dd-ddm,dd-ddm-drop,dd-drag,dd-proxy,dd-constrain,dd-drop,dd-scroll,dd-drop-plugin"
    * @private
    * @method _explodeRollups
    */
    _explodeRollups: function() {
        var self = this, m, m2, i, a, v, len, len2,
        r = self.required;
 
        if (!self.allowRollup) {
            for (i in r) {
                if (r.hasOwnProperty(i)) {
                    m = self.getModule(i);
                    if (m && m.use) {
                        len = m.use.length;
                        for (a = 0; a < len; a++) {
                            m2 = self.getModule(m.use[a]);
                            if (m2 && m2.use) {
                                len2 = m2.use.length;
                                for (v = 0; v < len2; v++) {
                                    r[m2.use[v]] = true;
                                }
                            } else {
                                r[m.use[a]] = true;
                            }
                        }
                    }
                }
            }
            self.required = r;
        }
 
    },
    /**
    * Explodes the required array to remove aliases and replace them with real modules
    * @method filterRequires
    * @param {Array} r The original requires array
    * @return {Array} The new array of exploded requirements
    */
    filterRequires: function(r) {
        if (r) {
            if (!Y.Lang.isArray(r)) {
                r = [r];
            }
            r = Y.Array(r);
            var c = [], i, mod, o, m;
 
            for (i = 0; i < r.length; i++) {
                mod = this.getModule(r[i]);
                if (mod && mod.use) {
                    for (o = 0; o < mod.use.length; o++) {
                        //Must walk the other modules in case a module is a rollup of rollups (datatype)
                        m = this.getModule(mod.use[o]);
                        if (m && m.use && (m.name !== mod.name)) {
                            c = Y.Array.dedupe([].concat(c, this.filterRequires(m.use)));
                        } else {
                            c.push(mod.use[o]);
                        }
                    }
                } else {
                    c.push(r[i]);
                }
            }
            r = c;
        }
        return r;
    },
    /**
     * Returns an object containing properties for all modules required
     * in order to load the requested module
     * @method getRequires
     * @param {object}  mod The module definition from moduleInfo.
     * @return {array} the expanded requirement list.
     */
    getRequires: function(mod) {
 
        if (!mod) {
            //console.log('returning no reqs for ' + mod.name);
            return NO_REQUIREMENTS;
        }
 
        if (mod._parsed) {
            //console.log('returning requires for ' + mod.name, mod.requires);
            return mod.expanded || NO_REQUIREMENTS;
        }
 
        //TODO add modue cache here out of scope..
 
        var i, m, j, add, packName, lang, testresults = this.testresults,
            name = mod.name, cond,
            adddef = ON_PAGE[name] && ON_PAGE[name].details,
            d, go, def,
            r, old_mod,
            o, skinmod, skindef, skinpar, skinname,
            intl = mod.lang || mod.intl,
            info = this.moduleInfo,
            ftests = Y.Features && Y.Features.tests.load,
            hash, reparse;
 
        // console.log(name);
 
        // pattern match leaves module stub that needs to be filled out
        if (mod.temp && adddef) {
            old_mod = mod;
            mod = this.addModule(adddef, name);
            mod.group = old_mod.group;
            mod.pkg = old_mod.pkg;
            delete mod.expanded;
        }
 
        // console.log('cache: ' + mod.langCache + ' == ' + this.lang);
 
        //If a skin or a lang is different, reparse..
        reparse = !((!this.lang || mod.langCache === this.lang) && (mod.skinCache === this.skin.defaultSkin));
 
        if (mod.expanded && !reparse) {
            //Y.log('Already expanded ' + name + ', ' + mod.expanded);
            return mod.expanded;
        }
 
 
        d = [];
        hash = {};
        r = this.filterRequires(mod.requires);
        if (mod.lang) {
            //If a module has a lang attribute, auto add the intl requirement.
            d.unshift('intl');
            r.unshift('intl');
            intl = true;
        }
        o = this.filterRequires(mod.optional);
 
        // Y.log("getRequires: " + name + " (dirty:" + this.dirty +
        // ", expanded:" + mod.expanded + ")");
 
        mod._parsed = true;
        mod.langCache = this.lang;
        mod.skinCache = this.skin.defaultSkin;
 
        for (i = 0; i < r.length; i++) {
            //Y.log(name + ' requiring ' + r[i], 'info', 'loader');
            if (!hash[r[i]]) {
                d.push(r[i]);
                hash[r[i]] = true;
                m = this.getModule(r[i]);
                if (m) {
                    add = this.getRequires(m);
                    intl = intl || (m.expanded_map &&
                        (INTL in m.expanded_map));
                    for (j = 0; j < add.length; j++) {
                        d.push(add[j]);
                    }
                }
            }
        }
 
        // get the requirements from superseded modules, if any
        r = this.filterRequires(mod.supersedes);
        if (r) {
            for (i = 0; i < r.length; i++) {
                if (!hash[r[i]]) {
                    // if this module has submodules, the requirements list is
                    // expanded to include the submodules.  This is so we can
                    // prevent dups when a submodule is already loaded and the
                    // parent is requested.
                    if (mod.submodules) {
                        d.push(r[i]);
                    }
 
                    hash[r[i]] = true;
                    m = this.getModule(r[i]);
 
                    if (m) {
                        add = this.getRequires(m);
                        intl = intl || (m.expanded_map &&
                            (INTL in m.expanded_map));
                        for (j = 0; j < add.length; j++) {
                            d.push(add[j]);
                        }
                    }
                }
            }
        }
 
        if (o && this.loadOptional) {
            for (i = 0; i < o.length; i++) {
                if (!hash[o[i]]) {
                    d.push(o[i]);
                    hash[o[i]] = true;
                    m = info[o[i]];
                    if (m) {
                        add = this.getRequires(m);
                        intl = intl || (m.expanded_map &&
                            (INTL in m.expanded_map));
                        for (j = 0; j < add.length; j++) {
                            d.push(add[j]);
                        }
                    }
                }
            }
        }
 
        cond = this.conditions[name];
 
        if (cond) {
            //Set the module to not parsed since we have conditionals and this could change the dependency tree.
            mod._parsed = false;
            if (testresults && ftests) {
                oeach(testresults, function(result, id) {
                    var condmod = ftests[id].name;
                    if (!hash[condmod] && ftests[id].trigger === name) {
                        if (result && ftests[id]) {
                            hash[condmod] = true;
                            d.push(condmod);
                        }
                    }
                });
            } else {
                for (i in cond) {
                    if (cond.hasOwnProperty(i)) {
                        if (!hash[i]) {
                            def = cond[i];
                            //first see if they've specfied a ua check
                            //then see if they've got a test fn & if it returns true
                            //otherwise just having a condition block is enough
                            go = def && ((!def.ua && !def.test) || (def.ua && Y.UA[def.ua]) ||
                                        (def.test && def.test(Y, r)));
 
                            if (go) {
                                hash[i] = true;
                                d.push(i);
                                m = this.getModule(i);
                                if (m) {
                                    add = this.getRequires(m);
                                    for (j = 0; j < add.length; j++) {
                                        d.push(add[j]);
                                    }
 
                                }
                            }
                        }
                    }
                }
            }
        }
 
        // Create skin modules
        if (mod.skinnable) {
            skindef = this.skin.overrides;
            for (i in YUI.Env.aliases) {
                if (YUI.Env.aliases.hasOwnProperty(i)) {
                    if (Y.Array.indexOf(YUI.Env.aliases[i], name) > -1) {
                        skinpar = i;
                    }
                }
            }
            if (skindef && (skindef[name] || (skinpar && skindef[skinpar]))) {
                skinname = name;
                if (skindef[skinpar]) {
                    skinname = skinpar;
                }
                for (i = 0; i < skindef[skinname].length; i++) {
                    skinmod = this._addSkin(skindef[skinname][i], name);
                    if (!this.isCSSLoaded(skinmod, this._boot)) {
                        d.push(skinmod);
                    }
                }
            } else {
                skinmod = this._addSkin(this.skin.defaultSkin, name);
                if (!this.isCSSLoaded(skinmod, this._boot)) {
                    d.push(skinmod);
                }
            }
        }
 
        mod._parsed = false;
 
        if (intl) {
 
            if (mod.lang && !mod.langPack && Y.Intl) {
                lang = Y.Intl.lookupBestLang(this.lang || ROOT_LANG, mod.lang);
                //Y.log('Best lang: ' + lang + ', this.lang: ' + this.lang + ', mod.lang: ' + mod.lang);
                packName = this.getLangPackName(lang, name);
                if (packName) {
                    d.unshift(packName);
                }
            }
            d.unshift(INTL);
        }
 
        mod.expanded_map = yArray.hash(d);
 
        mod.expanded = YObject.keys(mod.expanded_map);
 
        return mod.expanded;
    },
    /**
    * Check to see if named css module is already loaded on the page
    * @method isCSSLoaded
    * @param {String} name The name of the css file
    * @return Boolean
    */
    isCSSLoaded: function(name, skip) {
        //TODO - Make this call a batching call with name being an array
        if (!name || !YUI.Env.cssStampEl || (!skip && this.ignoreRegistered)) {
            Y.log('isCSSLoaded was skipped for ' + name, 'warn', 'loader');
            return false;
        }
        var el = YUI.Env.cssStampEl,
            ret = false,
            mod = YUI.Env._cssLoaded[name],
            style = el.currentStyle; //IE
 
 
        if (mod !== undefined) {
            //Y.log('isCSSLoaded was cached for ' + name, 'warn', 'loader');
            return mod;
        }
 
        //Add the classname to the element
        el.className = name;
 
        if (!style) {
            style = Y.config.doc.defaultView.getComputedStyle(el, null);
        }
 
        if (style && style.display === 'none') {
            ret = true;
        }
 
        Y.log('Has Skin? ' + name + ' : ' + ret, 'info', 'loader');
 
        el.className = ''; //Reset the classname to ''
 
        YUI.Env._cssLoaded[name] = ret;
 
        return ret;
    },
 
    /**
     * Returns a hash of module names the supplied module satisfies.
     * @method getProvides
     * @param {string} name The name of the module.
     * @return {object} what this module provides.
     */
    getProvides: function(name) {
        var m = this.getModule(name), o, s;
            // supmap = this.provides;
 
        if (!m) {
            return NOT_FOUND;
        }
 
        if (m && !m.provides) {
            o = {};
            s = m.supersedes;
 
            if (s) {
                yArray.each(s, function(v) {
                    Y.mix(o, this.getProvides(v));
                }, this);
            }
 
            o[name] = true;
            m.provides = o;
 
        }
 
        return m.provides;
    },
 
    /**
     * Calculates the dependency tree, the result is stored in the sorted
     * property.
     * @method calculate
     * @param {object} o optional options object.
     * @param {string} type optional argument to prune modules.
     */
    calculate: function(o, type) {
        if (o || type || this.dirty) {
 
            if (o) {
                this._config(o);
            }
 
            if (!this._init) {
                this._setup();
            }
 
            this._explode();
 
            if (this.allowRollup) {
                this._rollup();
            } else {
                this._explodeRollups();
            }
            this._reduce();
            this._sort();
        }
    },
    /**
    * Creates a "psuedo" package for languages provided in the lang array
    * @method _addLangPack
    * @private
    * @param {String} lang The language to create
    * @param {Object} m The module definition to create the language pack around
    * @param {String} packName The name of the package (e.g: lang/datatype-date-en-US)
    * @return {Object} The module definition
    */
    _addLangPack: function(lang, m, packName) {
        var name = m.name,
            packPath, conf,
            existing = this.moduleInfo[packName];
 
        if (!existing) {
 
            packPath = _path((m.pkg || name), packName, JS, true);
 
            conf = {
                path: packPath,
                intl: true,
                langPack: true,
                ext: m.ext,
                group: m.group,
                supersedes: []
            };
            if (m.root) {
                conf.root = m.root;
            }
            if (m.base) {
                conf.base = m.base;
            }
 
            if (m.configFn) {
                conf.configFn = m.configFn;
            }
 
            this.addModule(conf, packName);
 
            if (lang) {
                Y.Env.lang = Y.Env.lang || {};
                Y.Env.lang[lang] = Y.Env.lang[lang] || {};
                Y.Env.lang[lang][name] = true;
            }
        }
 
        return this.moduleInfo[packName];
    },
 
    /**
     * Investigates the current YUI configuration on the page.  By default,
     * modules already detected will not be loaded again unless a force
     * option is encountered.  Called by calculate()
     * @method _setup
     * @private
     */
    _setup: function() {
        var info = this.moduleInfo, name, i, j, m, l,
            packName;
 
        for (name in info) {
            if (info.hasOwnProperty(name)) {
                m = info[name];
                if (m) {
 
                    // remove dups
                    //m.requires = YObject.keys(yArray.hash(m.requires));
                    m.requires = yArray.dedupe(m.requires);
 
                    // Create lang pack modules
                    //if (m.lang && m.lang.length) {
                    if (m.lang) {
                        // Setup root package if the module has lang defined,
                        // it needs to provide a root language pack
                        packName = this.getLangPackName(ROOT_LANG, name);
                        this._addLangPack(null, m, packName);
                    }
 
                }
            }
        }
 
 
        //l = Y.merge(this.inserted);
        l = {};
 
        // available modules
        if (!this.ignoreRegistered) {
            Y.mix(l, GLOBAL_ENV.mods);
        }
 
        // add the ignore list to the list of loaded packages
        if (this.ignore) {
            Y.mix(l, yArray.hash(this.ignore));
        }
 
        // expand the list to include superseded modules
        for (j in l) {
            if (l.hasOwnProperty(j)) {
                Y.mix(l, this.getProvides(j));
            }
        }
 
        // remove modules on the force list from the loaded list
        if (this.force) {
            for (i = 0; i < this.force.length; i++) {
                if (this.force[i] in l) {
                    delete l[this.force[i]];
                }
            }
        }
 
        Y.mix(this.loaded, l);
 
        this._init = true;
    },
 
    /**
     * Builds a module name for a language pack
     * @method getLangPackName
     * @param {string} lang the language code.
     * @param {string} mname the module to build it for.
     * @return {string} the language pack module name.
     */
    getLangPackName: function(lang, mname) {
        return ('lang/' + mname + ((lang) ? '_' + lang : ''));
    },
    /**
     * Inspects the required modules list looking for additional
     * dependencies.  Expands the required list to include all
     * required modules.  Called by calculate()
     * @method _explode
     * @private
     */
    _explode: function() {
        //TODO Move done out of scope
        var r = this.required, m, reqs, done = {},
            self = this, name, expound;
 
        // the setup phase is over, all modules have been created
        self.dirty = false;
 
        self._explodeRollups();
        r = self.required;
 
        for (name in r) {
            if (r.hasOwnProperty(name)) {
                if (!done[name]) {
                    done[name] = true;
                    m = self.getModule(name);
                    if (m) {
                        expound = m.expound;
 
                        if (expound) {
                            r[expound] = self.getModule(expound);
                            reqs = self.getRequires(r[expound]);
                            Y.mix(r, yArray.hash(reqs));
                        }
 
                        reqs = self.getRequires(m);
                        Y.mix(r, yArray.hash(reqs));
                    }
                }
            }
        }
 
        // Y.log('After explode: ' + YObject.keys(r));
    },
    /**
    * The default method used to test a module against a pattern
    * @method _patternTest
    * @private
    * @param {String} mname The module being tested
    * @param {String} pname The pattern to match
    */
    _patternTest: function(mname, pname) {
        return (mname.indexOf(pname) > -1);
    },
    /**
    * Get's the loader meta data for the requested module
    * @method getModule
    * @param {String} mname The module name to get
    * @return {Object} The module metadata
    */
    getModule: function(mname) {
        //TODO: Remove name check - it's a quick hack to fix pattern WIP
        if (!mname) {
            return null;
        }
 
        var p, found, pname,
            m = this.moduleInfo[mname],
            patterns = this.patterns;
 
        // check the patterns library to see if we should automatically add
        // the module with defaults
        if (!m || (m && m.ext)) {
           // Y.log('testing patterns ' + YObject.keys(patterns));
            for (pname in patterns) {
                if (patterns.hasOwnProperty(pname)) {
                    // Y.log('testing pattern ' + i);
                    p = patterns[pname];
 
                    //There is no test method, create a default one that tests
                    // the pattern against the mod name
                    if (!p.test) {
                        p.test = this._patternTest;
                    }
 
                    if (p.test(mname, pname)) {
                        // use the metadata supplied for the pattern
                        // as the module definition.
                        found = p;
                        break;
                    }
                }
            }
        }
 
        if (!m) {
            if (found) {
                if (p.action) {
                    // Y.log('executing pattern action: ' + pname);
                    p.action.call(this, mname, pname);
                } else {
Y.log('Undefined module: ' + mname + ', matched a pattern: ' +
    pname, 'info', 'loader');
                    // ext true or false?
                    m = this.addModule(Y.merge(found), mname);
                    if (found.configFn) {
                        m.configFn = found.configFn;
                    }
                    m.temp = true;
                }
            }
        } else {
            if (found && m && found.configFn && !m.configFn) {
                m.configFn = found.configFn;
                m.configFn(m);
            }
        }
 
        return m;
    },
 
    // impl in rollup submodule
    _rollup: function() { },
 
    /**
     * Remove superceded modules and loaded modules.  Called by
     * calculate() after we have the mega list of all dependencies
     * @method _reduce
     * @return {object} the reduced dependency hash.
     * @private
     */
    _reduce: function(r) {
 
        r = r || this.required;
 
        var i, j, s, m, type = this.loadType,
        ignore = this.ignore ? yArray.hash(this.ignore) : false;
 
        for (i in r) {
            if (r.hasOwnProperty(i)) {
                m = this.getModule(i);
                // remove if already loaded
                if (((this.loaded[i] || ON_PAGE[i]) &&
                        !this.forceMap[i] && !this.ignoreRegistered) ||
                        (type && m && m.type !== type)) {
                    delete r[i];
                }
                if (ignore && ignore[i]) {
                    delete r[i];
                }
                // remove anything this module supersedes
                s = m && m.supersedes;
                if (s) {
                    for (j = 0; j < s.length; j++) {
                        if (s[j] in r) {
                            delete r[s[j]];
                        }
                    }
                }
            }
        }
 
        return r;
    },
    /**
    * Handles the queue when a module has been loaded for all cases
    * @method _finish
    * @private
    * @param {String} msg The message from Loader
    * @param {Boolean} success A boolean denoting success or failure
    */
    _finish: function(msg, success) {
        Y.log('loader finishing: ' + msg + ', ' + Y.id + ', ' +
            this.data, 'info', 'loader');
 
        _queue.running = false;
 
        var onEnd = this.onEnd;
        if (onEnd) {
            onEnd.call(this.context, {
                msg: msg,
                data: this.data,
                success: success
            });
        }
        this._continue();
    },
    /**
    * The default Loader onSuccess handler, calls this.onSuccess with a payload
    * @method _onSuccess
    * @private
    */
    _onSuccess: function() {
        var self = this, skipped = Y.merge(self.skipped), fn,
            failed = [], rreg = self.requireRegistration,
            success, msg, i, mod;
 
        for (i in skipped) {
            if (skipped.hasOwnProperty(i)) {
                delete self.inserted[i];
            }
        }
 
        self.skipped = {};
 
        for (i in self.inserted) {
            if (self.inserted.hasOwnProperty(i)) {
                mod = self.getModule(i);
                if (mod && rreg && mod.type === JS && !(i in YUI.Env.mods)) {
                    failed.push(i);
                } else {
                    Y.mix(self.loaded, self.getProvides(i));
                }
            }
        }
 
        fn = self.onSuccess;
        msg = (failed.length) ? 'notregistered' : 'success';
        success = !(failed.length);
        if (fn) {
            fn.call(self.context, {
                msg: msg,
                data: self.data,
                success: success,
                failed: failed,
                skipped: skipped
            });
        }
        self._finish(msg, success);
    },
    /**
    * The default Loader onProgress handler, calls this.onProgress with a payload
    * @method _onProgress
    * @private
    */
    _onProgress: function(e) {
        var self = this, i;
        //set the internal cache to what just came in.
        if (e.data && e.data.length) {
            for (i = 0; i < e.data.length; i++) {
                e.data[i] = self.getModule(e.data[i].name);
            }
        }
        if (self.onProgress) {
            self.onProgress.call(self.context, {
                name: e.url,
                data: e.data
            });
        }
    },
    /**
    * The default Loader onFailure handler, calls this.onFailure with a payload
    * @method _onFailure
    * @private
    */
    _onFailure: function(o) {
        var f = this.onFailure, msg = [], i = 0, len = o.errors.length;
 
        for (i; i < len; i++) {
            msg.push(o.errors[i].error);
        }
 
        msg = msg.join(',');
 
        Y.log('load error: ' + msg + ', ' + Y.id, 'error', 'loader');
 
        if (f) {
            f.call(this.context, {
                msg: msg,
                data: this.data,
                success: false
            });
        }
 
        this._finish(msg, false);
 
    },
 
    /**
    * The default Loader onTimeout handler, calls this.onTimeout with a payload
    * @method _onTimeout
    * @param {Get.Transaction} transaction The Transaction object from `Y.Get`
    * @private
    */
    _onTimeout: function(transaction) {
        Y.log('loader timeout: ' + Y.id, 'error', 'loader');
        var f = this.onTimeout;
        if (f) {
            f.call(this.context, {
                msg: 'timeout',
                data: this.data,
                success: false,
                transaction: transaction
            });
        }
    },
 
    /**
     * Sorts the dependency tree.  The last step of calculate()
     * @method _sort
     * @private
     */
    _sort: function() {
 
        // create an indexed list
        var s = YObject.keys(this.required),
            // loaded = this.loaded,
            //TODO Move this out of scope
            done = {},
            p = 0, l, a, b, j, k, moved, doneKey;
 
        // keep going until we make a pass without moving anything
        for (;;) {
 
            l = s.length;
            moved = false;
 
            // start the loop after items that are already sorted
            for (j = p; j < l; j++) {
 
                // check the next module on the list to see if its
                // dependencies have been met
                a = s[j];
 
                // check everything below current item and move if we
                // find a requirement for the current item
                for (k = j + 1; k < l; k++) {
                    doneKey = a + s[k];
 
                    if (!done[doneKey] && this._requires(a, s[k])) {
 
                        // extract the dependency so we can move it up
                        b = s.splice(k, 1);
 
                        // insert the dependency above the item that
                        // requires it
                        s.splice(j, 0, b[0]);
 
                        // only swap two dependencies once to short circut
                        // circular dependencies
                        done[doneKey] = true;
 
                        // keep working
                        moved = true;
 
                        break;
                    }
                }
 
                // jump out of loop if we moved something
                if (moved) {
                    break;
                // this item is sorted, move our pointer and keep going
                } else {
                    p++;
                }
            }
 
            // when we make it here and moved is false, we are
            // finished sorting
            if (!moved) {
                break;
            }
 
        }
 
        this.sorted = s;
    },
 
    /**
    * Handles the actual insertion of script/link tags
    * @method _insert
    * @private
    * @param {Object} source The YUI instance the request came from
    * @param {Object} o The metadata to include
    * @param {String} type JS or CSS
    * @param {Boolean} [skipcalc=false] Do a Loader.calculate on the meta
    */
    _insert: function(source, o, type, skipcalc) {
 
        Y.log('private _insert() ' + (type || '') + ', ' + Y.id, "info", "loader");
 
        // restore the state at the time of the request
        if (source) {
            this._config(source);
        }
 
        // build the dependency list
        // don't include type so we can process CSS and script in
        // one pass when the type is not specified.
 
        var modules = this.resolve(!skipcalc),
            self = this, comp = 0, actions = 0,
            mods = {}, deps, complete;
 
        self._refetch = [];
 
        if (type) {
            //Filter out the opposite type and reset the array so the checks later work
            modules[((type === JS) ? CSS : JS)] = [];
        }
        if (!self.fetchCSS) {
            modules.css = [];
        }
        if (modules.js.length) {
            comp++;
        }
        if (modules.css.length) {
            comp++;
        }
 
        //console.log('Resolved Modules: ', modules);
 
        complete = function(d) {
            actions++;
            var errs = {}, i = 0, o = 0, u = '', fn,
                modName, resMods;
 
            if (d && d.errors) {
                for (i = 0; i < d.errors.length; i++) {
                    if (d.errors[i].request) {
                        u = d.errors[i].request.url;
                    } else {
                        u = d.errors[i];
                    }
                    errs[u] = u;
                }
            }
 
            if (d && d.data && d.data.length && (d.type === 'success')) {
                for (i = 0; i < d.data.length; i++) {
                    self.inserted[d.data[i].name] = true;
                    //If the external module has a skin or a lang, reprocess it
                    if (d.data[i].lang || d.data[i].skinnable) {
                        delete self.inserted[d.data[i].name];
                        self._refetch.push(d.data[i].name);
                    }
                }
            }
 
            if (actions === comp) {
                self._loading = null;
                Y.log('Loader actions complete!', 'info', 'loader');
                if (self._refetch.length) {
                    //Get the deps for the new meta-data and reprocess
                    Y.log('Found potential modules to refetch', 'info', 'loader');
                    for (i = 0; i < self._refetch.length; i++) {
                        deps = self.getRequires(self.getModule(self._refetch[i]));
                        for (o = 0; o < deps.length; o++) {
                            if (!self.inserted[deps[o]]) {
                                //We wouldn't be to this point without the module being here
                                mods[deps[o]] = deps[o];
                            }
                        }
                    }
                    mods = Y.Object.keys(mods);
                    if (mods.length) {
                        Y.log('Refetching modules with new meta-data', 'info', 'loader');
                        self.require(mods);
                        resMods = self.resolve(true);
                        if (resMods.cssMods.length) {
                            for (i=0; i <  resMods.cssMods.length; i++) {
                                modName = resMods.cssMods[i].name;
                                delete YUI.Env._cssLoaded[modName];
                                if (self.isCSSLoaded(modName)) {
                                    self.inserted[modName] = true;
                                    delete self.required[modName];
                                }
                            }
                            self.sorted = [];
                            self._sort();
                        }
                        d = null; //bail
                        self._insert(); //insert the new deps
                    }
                }
                if (d && d.fn) {
                    Y.log('Firing final Loader callback!', 'info', 'loader');
                    fn = d.fn;
                    delete d.fn;
                    fn.call(self, d);
                }
            }
        };
 
        this._loading = true;
 
        if (!modules.js.length && !modules.css.length) {
            Y.log('No modules resolved..', 'warn', 'loader');
            actions = -1;
            complete({
                fn: self._onSuccess
            });
            return;
        }
 
 
        if (modules.css.length) { //Load CSS first
            Y.log('Loading CSS modules', 'info', 'loader');
            Y.Get.css(modules.css, {
                data: modules.cssMods,
                attributes: self.cssAttributes,
                insertBefore: self.insertBefore,
                charset: self.charset,
                timeout: self.timeout,
                context: self,
                onProgress: function(e) {
                    self._onProgress.call(self, e);
                },
                onTimeout: function(d) {
                    self._onTimeout.call(self, d);
                },
                onSuccess: function(d) {
                    d.type = 'success';
                    d.fn = self._onSuccess;
                    complete.call(self, d);
                },
                onFailure: function(d) {
                    d.type = 'failure';
                    d.fn = self._onFailure;
                    complete.call(self, d);
                }
            });
        }
 
        if (modules.js.length) {
            Y.log('Loading JS modules', 'info', 'loader');
            Y.Get.js(modules.js, {
                data: modules.jsMods,
                insertBefore: self.insertBefore,
                attributes: self.jsAttributes,
                charset: self.charset,
                timeout: self.timeout,
                autopurge: false,
                context: self,
                async: self.async,
                onProgress: function(e) {
                    self._onProgress.call(self, e);
                },
                onTimeout: function(d) {
                    self._onTimeout.call(self, d);
                },
                onSuccess: function(d) {
                    d.type = 'success';
                    d.fn = self._onSuccess;
                    complete.call(self, d);
                },
                onFailure: function(d) {
                    d.type = 'failure';
                    d.fn = self._onFailure;
                    complete.call(self, d);
                }
            });
        }
    },
    /**
    * Once a loader operation is completely finished, process any additional queued items.
    * @method _continue
    * @private
    */
    _continue: function() {
        if (!(_queue.running) && _queue.size() > 0) {
            _queue.running = true;
            _queue.next()();
        }
    },
 
    /**
     * inserts the requested modules and their dependencies.
     * <code>type</code> can be "js" or "css".  Both script and
     * css are inserted if type is not provided.
     * @method insert
     * @param {object} o optional options object.
     * @param {string} type the type of dependency to insert.
     */
    insert: function(o, type, skipsort) {
         Y.log('public insert() ' + (type || '') + ', ' +
         Y.Object.keys(this.required), "info", "loader");
        var self = this, copy = Y.merge(this);
        delete copy.require;
        delete copy.dirty;
        _queue.add(function() {
            self._insert(copy, o, type, skipsort);
        });
        this._continue();
    },
 
    /**
     * Executed every time a module is loaded, and if we are in a load
     * cycle, we attempt to load the next script.  Public so that it
     * is possible to call this if using a method other than
     * Y.register to determine when scripts are fully loaded
     * @method loadNext
     * @deprecated
     * @param {string} mname optional the name of the module that has
     * been loaded (which is usually why it is time to load the next
     * one).
     */
    loadNext: function() {
        Y.log('loadNext was called..', 'error', 'loader');
        return;
    },
 
    /**
     * Apply filter defined for this instance to a url/path
     * @method _filter
     * @param {string} u the string to filter.
     * @param {string} name the name of the module, if we are processing
     * a single module as opposed to a combined url.
     * @return {string} the filtered string.
     * @private
     */
    _filter: function(u, name, group) {
        var f = this.filter,
            hasFilter = name && (name in this.filters),
            modFilter = hasFilter && this.filters[name],
            groupName = group || (this.moduleInfo[name] ? this.moduleInfo[name].group : null);
 
        if (groupName && this.groups[groupName] && this.groups[groupName].filter) {
            modFilter = this.groups[groupName].filter;
            hasFilter = true;
        }
 
        if (u) {
            if (hasFilter) {
                f = (L.isString(modFilter)) ? this.FILTER_DEFS[modFilter.toUpperCase()] || null : modFilter;
            }
            if (f) {
                u = u.replace(new RegExp(f.searchExp, 'g'), f.replaceStr);
            }
        }
        return u;
    },
 
    /**
     * Generates the full url for a module
     * @method _url
     * @param {string} path the path fragment.
     * @param {String} name The name of the module
     * @param {String} [base=self.base] The base url to use
     * @return {string} the full url.
     * @private
     */
    _url: function(path, name, base) {
        return this._filter((base || this.base || '') + path, name);
    },
    /**
    * Returns an Object hash of file arrays built from `loader.sorted` or from an arbitrary list of sorted modules.
    * @method resolve
    * @param {Boolean} [calc=false] Perform a loader.calculate() before anything else
    * @param {Array} [s=loader.sorted] An override for the loader.sorted array
    * @return {Object} Object hash (js and css) of two arrays of file lists
    * @example This method can be used as an off-line dep calculator
    *
    *        var Y = YUI();
    *        var loader = new Y.Loader({
    *            filter: 'debug',
    *            base: '../../',
    *            root: 'build/',
    *            combine: true,
    *            require: ['node', 'dd', 'console']
    *        });
    *        var out = loader.resolve(true);
    *
    */
    resolve: function(calc, s) {
 
        var len, i, m, url, group, groupName, j, frag,
            comboSource, comboSources, mods, comboBase,
            base, urls, u = [], tmpBase, baseLen, resCombos = {},
            self = this, comboSep, maxURLLength,
            inserted = (self.ignoreRegistered) ? {} : self.inserted,
            resolved = { js: [], jsMods: [], css: [], cssMods: [] },
            type = self.loadType || 'js', addSingle;
 
        if (self.skin.overrides || self.skin.defaultSkin !== DEFAULT_SKIN || self.ignoreRegistered) {
            self._resetModules();
        }
 
        if (calc) {
            self.calculate();
        }
        s = s || self.sorted;
 
        addSingle = function(m) {
 
            if (m) {
                group = (m.group && self.groups[m.group]) || NOT_FOUND;
 
                //Always assume it's async
                if (group.async === false) {
                    m.async = group.async;
                }
 
                url = (m.fullpath) ? self._filter(m.fullpath, s[i]) :
                      self._url(m.path, s[i], group.base || m.base);
 
                if (m.attributes || m.async === false) {
                    url = {
                        url: url,
                        async: m.async
                    };
                    if (m.attributes) {
                        url.attributes = m.attributes;
                    }
                }
                resolved[m.type].push(url);
                resolved[m.type + 'Mods'].push(m);
            } else {
                Y.log('Undefined Module', 'warn', 'loader');
            }
 
        };
 
        len = s.length;
 
        // the default combo base
        comboBase = self.comboBase;
 
        url = comboBase;
 
        comboSources = {};
 
        for (i = 0; i < len; i++) {
            comboSource = comboBase;
            m = self.getModule(s[i]);
            groupName = m && m.group;
            group = self.groups[groupName];
            if (groupName && group) {
 
                if (!group.combine || m.fullpath) {
                    //This is not a combo module, skip it and load it singly later.
                    addSingle(m);
                    continue;
                }
                m.combine = true;
                if (group.comboBase) {
                    comboSource = group.comboBase;
                }
 
                if ("root" in group && L.isValue(group.root)) {
                    m.root = group.root;
                }
                m.comboSep = group.comboSep || self.comboSep;
                m.maxURLLength = group.maxURLLength || self.maxURLLength;
            } else {
                if (!self.combine) {
                    //This is not a combo module, skip it and load it singly later.
                    addSingle(m);
                    continue;
                }
            }
 
            comboSources[comboSource] = comboSources[comboSource] || [];
            comboSources[comboSource].push(m);
        }
 
        for (j in comboSources) {
            if (comboSources.hasOwnProperty(j)) {
                resCombos[j] = resCombos[j] || { js: [], jsMods: [], css: [], cssMods: [] };
                url = j;
                mods = comboSources[j];
                len = mods.length;
 
                if (len) {
                    for (i = 0; i < len; i++) {
                        if (inserted[mods[i]]) {
                            continue;
                        }
                        m = mods[i];
                        // Do not try to combine non-yui JS unless combo def
                        // is found
                        if (m && (m.combine || !m.ext)) {
                            resCombos[j].comboSep = m.comboSep;
                            resCombos[j].group = m.group;
                            resCombos[j].maxURLLength = m.maxURLLength;
                            frag = ((L.isValue(m.root)) ? m.root : self.root) + (m.path || m.fullpath);
                            frag = self._filter(frag, m.name);
                            resCombos[j][m.type].push(frag);
                            resCombos[j][m.type + 'Mods'].push(m);
                        } else {
                            //Add them to the next process..
                            if (mods[i]) {
                                addSingle(mods[i]);
                            }
                        }
 
                    }
                }
            }
        }
 
 
        for (j in resCombos) {
            if (resCombos.hasOwnProperty(j)) {
                base = j;
                comboSep = resCombos[base].comboSep || self.comboSep;
                maxURLLength = resCombos[base].maxURLLength || self.maxURLLength;
                Y.log('Using maxURLLength of ' + maxURLLength, 'info', 'loader');
                for (type in resCombos[base]) {
                    if (type === JS || type === CSS) {
                        urls = resCombos[base][type];
                        mods = resCombos[base][type + 'Mods'];
                        len = urls.length;
                        tmpBase = base + urls.join(comboSep);
                        baseLen = tmpBase.length;
                        if (maxURLLength <= base.length) {
                            Y.log('maxURLLength (' + maxURLLength + ') is lower than the comboBase length (' + base.length + '), resetting to default (' + MAX_URL_LENGTH + ')', 'error', 'loader');
                            maxURLLength = MAX_URL_LENGTH;
                        }
 
                        if (len) {
                            if (baseLen > maxURLLength) {
                                Y.log('Exceeded maxURLLength (' + maxURLLength + ') for ' + type + ', splitting', 'info', 'loader');
                                u = [];
                                for (s = 0; s < len; s++) {
                                    u.push(urls[s]);
                                    tmpBase = base + u.join(comboSep);
 
                                    if (tmpBase.length > maxURLLength) {
                                        m = u.pop();
                                        tmpBase = base + u.join(comboSep);
                                        resolved[type].push(self._filter(tmpBase, null, resCombos[base].group));
                                        u = [];
                                        if (m) {
                                            u.push(m);
                                        }
                                    }
                                }
                                if (u.length) {
                                    tmpBase = base + u.join(comboSep);
                                    resolved[type].push(self._filter(tmpBase, null, resCombos[base].group));
                                }
                            } else {
                                resolved[type].push(self._filter(tmpBase, null, resCombos[base].group));
                            }
                        }
                        resolved[type + 'Mods'] = resolved[type + 'Mods'].concat(mods);
                    }
                }
            }
        }
 
        resCombos = null;
 
        return resolved;
    },
    /**
    Shortcut to calculate, resolve and load all modules.
 
        var loader = new Y.Loader({
            ignoreRegistered: true,
            modules: {
                mod: {
                    path: 'mod.js'
                }
            },
            requires: [ 'mod' ]
        });
        loader.load(function() {
            console.log('All modules have loaded..');
        });
 
 
    @method load
    @param {Callback} cb Executed after all load operations are complete
    */
    load: function(cb) {
        if (!cb) {
            Y.log('No callback supplied to load()', 'error', 'loader');
            return;
        }
        var self = this,
            out = self.resolve(true);
 
        self.data = out;
 
        self.onEnd = function() {
            cb.apply(self.context || self, arguments);
        };
 
        self.insert();
    }
};