# Yahoo! UI Library

### yui 3.0.0b1

Yahoo! UI Library > yui > loader.js (source view)
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    (function() {
    /**
     * 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 supports rollup files and will
     * automatically use these when appropriate in order to minimize the number of
     * http connections required to load all of the dependencies.  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.
     *
     * @module yui
     * @submodule loader
     */

    /**
     * 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 supports rollup files and will
     * automatically use these when appropriate in order to minimize the number of
     * http connections required to load all of the dependencies.  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.
     * @class Loader
     * @constructor
     * @param o an optional set of configuration options.  Valid options:
     * <ul>
     *  <li>base:
     *  The base dir</li>
     *  <li>secureBase:
     *  The secure base dir (not implemented)</li>
     *  <li>comboBase:
     *  The YUI combo service base dir. Ex: http://yui.yahooapis.com/combo?</li>
     *  <li>root:
     *  The root path to prepend to module names for the combo service. Ex: 2.5.2/build/</li>
     *  <li>filter:
     *
     * 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:
     * <pre>
     *  myFilter: &#123;
     *      'searchExp': "-min\\.js",
     *      'replaceStr': "-debug.js"
     *  &#125;
     * </pre>
     *
     *  </li>
     *  <li>filters: per-component filter specification.  If specified for a given component, this overrides the filter config</li>
     *  <li>combine:
     *  Use the YUI combo service to reduce the number of http connections required to load your dependencies</li>
     *  <li>ignore:
     *  A list of modules that should never be dynamically loaded</li>
     *  <li>force:
     *  A list of modules that should always be loaded when required, even if already present on the page</li>
     *  <li>insertBefore:
     *  Node or id for a node that should be used as the insertion point for new nodes</li>
     *  <li>charset:
     *  charset for dynamic nodes (deprecated, use jsAttributes or cssAttributes)</li>
     *  <li>jsAttributes: object literal containing attributes to add to script nodes</li>
     *  <li>cssAttributes: object literal containing attributes to add to link nodes</li>
     *  <li>timeout:
     *  number of milliseconds before a timeout occurs when dynamically loading nodes.  in not set, there is no timeout</li>
     *  <li>context:
     *  execution context for all callbacks</li>
     *  <li>onSuccess:
     *  callback for the 'success' event</li>
     *  <li>onFailure: callback for the 'failure' event</li>
     *  <li>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.</li>
     *  <li>onTimeout:
     *  callback for the 'timeout' event</li>
     *  <li>onProgress:
     *  callback executed each time a script or css file is loaded</li>
     *  <li>modules:
     *  A list of module definitions.  See Loader.addModule for the supported module metadata</li>
     * </ul>
     */

    // @TODO backed out the custom event changes so that the event system
    // isn't required in the seed build.  If needed, we may want to
    // add them back if the event system is detected.

    /*
     * Global loader queue
     * @property _loaderQueue
     * @type Queue
     * @private
     */
    YUI.Env._loaderQueue = YUI.Env._loaderQueue || new Y.Queue();

    var GLOBAL_ENV = YUI.Env,
        GLOBAL_LOADED,
        BASE = 'base',
        CSS = 'css',
        JS = 'js',
        CSSRESET = 'cssreset',
        CSSFONTS = 'cssfonts',
        CSSGRIDS = 'cssgrids',
        CSSBASE  = 'cssbase',
        CSS_AFTER = [CSSRESET, CSSFONTS, CSSGRIDS,
                     'cssreset-context', 'cssfonts-context', 'cssgrids-context'],
        YUI_CSS = ['reset', 'fonts', 'grids', BASE],
        VERSION = Y.version,
        ROOT = VERSION + '/build/',
        CONTEXT = '-context',

        ANIMBASE = 'anim-base',
        DDDRAG = 'dd-drag',
        DOM = 'dom',
        DATASCHEMABASE = 'dataschema-base',
        DATASOURCELOCAL = 'datasource-local',
        DOMBASE = 'dom-base',
        DOMSTYLE = 'dom-style',
        DUMP = 'dump',
        GET = 'get',
        EVENT = 'event',
        EVENTCUSTOM = 'event-custom',
        IOBASE = 'io-base',
        NODE = 'node',
        NODEBASE = 'node-base',
        OOP = 'oop',
        SELECTORCSS2 = 'selector-css2',
        SUBSTITUTE = 'substitute',
        WIDGET = 'widget',
        WIDGETPOSITION = 'widget-position',
        YUIBASE = 'yui-base',

    	PLUGIN = 'plugin',

        META = {

        version: VERSION,

        root: ROOT,

        base: 'http://yui.yahooapis.com/' + ROOT,

        comboBase: 'http://yui.yahooapis.com/combo?',

        skin: {
            defaultSkin: 'sam',
            base: 'assets/skins/',
            path: 'skin.css',
            after: CSS_AFTER
            //rollup: 3
        },

        modules: {

           dom: {
                requires: [OOP],
                submodules: {

                    'dom-base': {
                        requires: [OOP]
                    },

                    'dom-style': {
                        requires: [DOMBASE]
                    },

                    'dom-screen': {
                        requires: [DOMBASE, DOMSTYLE]
                    },

                    'selector-native': {
                        requires: [DOMBASE]
                    },

                    'selector-css2': {
                        requires: ['selector-native']
                    },

                    'selector': {
                        requires: [DOMBASE]
                    }

                },

                plugins: {
                    'selector-css3': {
                        requires: [SELECTORCSS2]
                    }
                }
            },

            node: {
                requires: [DOM, BASE],
                expound: EVENT,

                submodules: {
                    'node-base': {
                        requires: [DOMBASE, BASE, SELECTORCSS2]
                    },

                    'node-style': {
                        requires: [DOMSTYLE, NODEBASE]
                    },

                    'node-screen': {
                        requires: ['dom-screen', NODEBASE]
                    }
                },

                plugins: {
                    'node-event-simulate': {
                        requires: [NODEBASE, 'event-simulate']
                    }
                }
            },

            anim: {
                requires: [BASE, NODE],
                submodules: {

                    'anim-base': {
                        requires: [BASE, 'node-style']
                    },

                    'anim-color': {
                        requires: [ANIMBASE]
                    },

                    'anim-curve': {
                        requires: ['anim-xy']
                    },

                    'anim-easing': {
                        requires: [ANIMBASE]
                    },

                    'anim-scroll': {
                        requires: [ANIMBASE]
                    },

                    'anim-xy': {
                        requires: [ANIMBASE, 'node-screen']
                    },

                    'anim-node-plugin': {
                         requires: [NODE, ANIMBASE]
                    }
                }
            },

            attribute: {
                requires: [EVENTCUSTOM]
            },

            base: {
                submodules: {

                    'base-base': {
                        requires: ['attribute']
                    },

                    'base-build': {
                        requires: ['base-base']
                    }
                }
            },

            cache: {
                requires: [PLUGIN]
            },

            compat: {
                requires: [NODE, DUMP, SUBSTITUTE]
            },

            classnamemanager: {
                requires: [YUIBASE]
            },

            collection: {
                requires: [OOP]
            },

            console: {
                requires: [WIDGET, SUBSTITUTE],
                skinnable: true,
                plugins: {
                    'console-filters': {
                        requires: [PLUGIN],
                        skinnable: true
                    }
                }
            },

            cookie: {
                requires: [YUIBASE]
            },

            dataschema:{
                submodules: {
                    'dataschema-base': {
                        requires: [BASE]
                    },
                    'dataschema-array': {
                        requires: [DATASCHEMABASE]
                    },
                    'dataschema-json': {
                        requires: [DATASCHEMABASE, 'json']
                    },
                    'dataschema-text': {
                        requires: [DATASCHEMABASE]
                    },
                    'dataschema-xml': {
                        requires: [DATASCHEMABASE]
                    }
                }
            },

            datasource:{
                submodules: {
                    'datasource-local': {
                        requires: [BASE]
                    },
                    'datasource-arrayschema': {
                        requires: [DATASOURCELOCAL, PLUGIN, 'dataschema-array']
                    },
                    'datasource-cache': {
                        requires: [DATASOURCELOCAL, 'cache']
                    },
                    'datasource-function': {
                        requires: [DATASOURCELOCAL]
                    },
                    'datasource-jsonschema': {
                        requires: [DATASOURCELOCAL, PLUGIN, 'dataschema-json']
                    },
                    'datasource-polling': {
                        requires: [DATASOURCELOCAL]
                    },
                    'datasource-get': {
                        requires: [DATASOURCELOCAL, GET]
                    },
                    'datasource-textschema': {
                        requires: [DATASOURCELOCAL, PLUGIN, 'dataschema-text']
                    },
                    'datasource-io': {
                        requires: [DATASOURCELOCAL, IOBASE]
                    },
                    'datasource-xmlschema': {
                        requires: [DATASOURCELOCAL, PLUGIN, 'dataschema-xml']
                    }
                }
            },

            datatype:{
                submodules: {
                    'datatype-date': {
                        requires: [YUIBASE]
                    },
                    'datatype-number': {
                        requires: [YUIBASE]
                    },
                    'datatype-xml': {
                        requires: [YUIBASE]
                    }
                }
            },

            dd:{
                submodules: {
                    'dd-ddm-base': {
                        requires: [NODE, BASE]
                    },
                    'dd-ddm':{
                        requires: ['dd-ddm-base']
                    },
                    'dd-ddm-drop':{
                        requires: ['dd-ddm']
                    },
                    'dd-drag':{
                        requires: ['dd-ddm-base']
                    },
                    'dd-drop':{
                        requires: ['dd-ddm-drop']
                    },
                    'dd-proxy':{
                        requires: [DDDRAG]
                    },
                    'dd-constrain':{
                        requires: [DDDRAG]
                    },
                    'dd-scroll':{
                        requires: [DDDRAG]
                    },
                    'dd-plugin':{
                        requires: [DDDRAG],
                        optional: ['dd-constrain', 'dd-proxy']
                    },
                    'dd-drop-plugin':{
                        requires: ['dd-drop']
                    }
                }
            },

            dump: {
                requires: [YUIBASE]
            },

            event: {
                requires: [EVENTCUSTOM, NODE]
            },

            'event-custom': {
                requires: [OOP]
            },

            'event-simulate': {
                requires: [EVENT]
            },

            'node-focusmanager': {
                requires: [NODE, PLUGIN]
            },

            get: {
                requires: [YUIBASE]
            },

            history: {
                requires: [NODE]
            },

            imageloader: {
                requires: [NODE]
            },

            io:{
                submodules: {

                    'io-base': {
                        requires: [EVENTCUSTOM]
                    },

                    'io-xdr': {
                        requires: [IOBASE]
                    },

                    'io-form': {
                        requires: [IOBASE, NODE]
                    },

                    'io-upload-iframe': {
                        requires: [IOBASE, NODE]
                    },

                    'io-queue': {
                        requires: [IOBASE, 'queue-promote']
                    }
                }
            },

            json: {
                submodules: {
                    'json-parse': {
                        requires: [YUIBASE]
                    },

                    'json-stringify': {
                        requires: [YUIBASE]
                    }
                }
            },

            loader: {
                requires: [GET]
            },

            'node-menunav': {
                requires: [NODE, 'classnamemanager', PLUGIN, 'node-focusmanager'],
                skinnable: true
            },

            oop: {
                requires: [YUIBASE]
            },

            overlay: {
                requires: [WIDGET, WIDGETPOSITION, 'widget-position-ext', 'widget-stack', 'widget-stdmod'],
                skinnable: true
            },

            plugin: {
                requires: [BASE]
            },

            profiler: {
                requires: [YUIBASE]
            },

            queue: {
                submodules: {
                    'queue-base': {
                        requires: [YUIBASE]
                    },
                    'queue-run': {
                        requires: ['queue-base', EVENTCUSTOM]
                    }
                },
                plugins: {
                    'queue-promote': { }
                }
            },

            slider: {
                requires: [WIDGET, 'dd-constrain'],
                skinnable: true
            },

            stylesheet: {
                requires: [YUIBASE]
            },

            substitute: {
                optional: [DUMP]
            },

            widget: {
                requires: [BASE, NODE, 'classnamemanager'],
                plugins: {
                    'widget-position': { },
                    'widget-position-ext': {
                        requires: [WIDGETPOSITION]
                    },
                    'widget-stack': {
                        skinnable: true
                    },
                    'widget-stdmod': { }
                },
                skinnable: true
            },

            yui: {
                supersedes: [YUIBASE, GET, 'loader', 'queue-base']
            },

            'yui-base': { },

            test: {
                requires: [SUBSTITUTE, NODE, 'json', 'event-simulate']
            }

        }
    },

    _path = function(dir, file, type) {
        return dir + '/' + file + '-min.' + (type || CSS);
    },

    _queue = YUI.Env._loaderQueue,

    mods  = META.modules, i, bname, mname, contextname,
    L     = Y.Lang,
    PROV  = "_provides",
    SUPER = "_supersedes";

    // Create the metadata for both the regular and context-aware
    // versions of the YUI CSS foundation.
    for (i=0; i<YUI_CSS.length; i=i+1) {
        bname = YUI_CSS[i];
        mname = CSS + bname;

        mods[mname] = {
            type: CSS,
            path: _path(mname, bname)
        };

        // define -context module
        contextname = mname + CONTEXT;
        bname = bname + CONTEXT;

        mods[contextname] = {
            type: CSS,
            path: _path(mname, bname)
        };

        if (mname == CSSGRIDS) {
            mods[mname].requires = [CSSFONTS];
            mods[mname].optional = [CSSRESET];
            mods[contextname].requires = [CSSFONTS + CONTEXT];
            mods[contextname].optional = [CSSRESET + CONTEXT];
        } else if (mname == CSSBASE) {
            mods[mname].after = CSS_AFTER;
            mods[contextname].after = CSS_AFTER;
        }
    }

    Y.Env.meta = META;

    GLOBAL_LOADED = GLOBAL_ENV._loaded;

    Y.Loader = function(o) {

        /**
         * Internal callback to handle multiple internal insert() calls
         * so that css is inserted prior to js
         * @property _internalCallback
         * @private
         */
        this._internalCallback = null;

        /**
         * Use the YUI environment listener to detect script load.  This
         * is only switched on for Safari 2.x and below.
         * @property _useYahooListener
         * @private
         */
        this._useYahooListener = false;

        /**
         * Callback that will be executed when the loader is finished
         * with an insert
         * @method onSuccess
         * @type function
         */
        this.onSuccess = null;

        /**
         * Callback that will be executed if there is a failure
         * @method onFailure
         * @type function
         */
        this.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
         */
        this.onCSS = null;

        /**
         * Callback executed each time a script or css file is loaded
         * @method onProgress
         * @type function
         */
        this.onProgress = null;

        /**
         * Callback that will be executed if a timeout occurs
         * @method onTimeout
         * @type function
         */
        this.onTimeout = null;

        /**
         * The execution context for all callbacks
         * @property context
         * @default {YUI} the YUI instance
         */
        this.context = Y;

        /**
         * Data that is passed to all callbacks
         * @property data
         */
        this.data = null;

        /**
         * Node reference or id where new nodes should be inserted before
         * @property insertBefore
         * @type string|HTMLElement
         */
        this.insertBefore = null;

        /**
         * The charset attribute for inserted nodes
         * @property charset
         * @type string
         * @deprecated, use cssAttributes or jsAttributes
         */
        this.charset = null;

        /**
         * An object literal containing attributes to add to link nodes
         * @property cssAttributes
         * @type object
         */
        this.cssAttributes = null;

        /**
         * An object literal containing attributes to add to script nodes
         * @property jsAttributes
         * @type object
         */
        this.jsAttributes = null;

        /**
         * The base directory.
         * @property base
         * @type string
         * @default http://yui.yahooapis.com/[YUI VERSION]/build/
         */
        this.base = Y.Env.meta.base;

        /**
         * Base path for the combo service
         * @property comboBase
         * @type string
         * @default http://yui.yahooapis.com/combo?
         */
        this.comboBase = Y.Env.meta.comboBase;

        /**
         * If configured, YUI JS resources will use the combo
         * handler
         * @property combine
         * @type boolean
         * @default true if a base dir isn't in the config
         */
        this.combine = (!(BASE in o));

        /**
         * Ignore modules registered on the YUI global
         * @property ignoreRegistered
         * @default false
         */
        this.ignoreRegistered = false;

        /**
         * Root path to prepend to module path for the combo
         * service
         * @property root
         * @type string
         * @default [YUI VERSION]/build/
         */
        this.root = Y.Env.meta.root;

        /**
         * Timeout value in milliseconds.  If set, this value will be used by
         * the get utility.  the timeout event will fire if
         * a timeout occurs.
         * @property timeout
         * @type int
         */
        this.timeout = 0;

        /**
         * A list of modules that should not be loaded, even if
         * they turn up in the dependency tree
         * @property ignore
         * @type string[]
         */
        this.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[]
         */
        this.force = null;

        this.forceMap = {};

        /**
         * Should we allow rollups
         * @property allowRollup
         * @type boolean
         * @default true
         */
        this.allowRollup = true;

        /**
         * 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:
         * <pre>
         *  myFilter: &#123;
         *      'searchExp': "-min\\.js",
         *      'replaceStr': "-debug.js"
         *  &#125;
         * </pre>
         * @property filter
         * @type string|{searchExp: string, replaceStr: string}
         */
        this.filter = null;

        /**
         * per-component filter specification.  If specified for a given component, this
         * overrides the filter config.
         * @property filters
         * @type object
         */
        this.filters = {};

        /**
         * The list of requested modules
         * @property required
         * @type {string: boolean}
         */
        this.required = {};

        /**
         * The library metadata
         * @property moduleInfo
         */
        // this.moduleInfo = Y.merge(Y.Env.meta.moduleInfo);
        this.moduleInfo = {};

        /**
         * 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:
         *
         *   <code>
         *   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/',
         *
         *      // The name of the rollup css file for the skin
         *      path: 'skin.css',
         *
         *      // The number of skinnable components requested that are
         *      // required before using the rollup file rather than the
         *      // individual component css files
         *      rollup: 3,
         *
         *      // 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']
         *      }
         *   }
         *   </code>
         *   @property skin
         */
         this.skin = Y.merge(Y.Env.meta.skin);

        var defaults = Y.Env.meta.modules, i;

        for (i in defaults) {
            if (defaults.hasOwnProperty(i)) {
                this._internal = true;
                this.addModule(defaults[i], i);
                this._internal = false;
            }
        }

        /**
         * List of rollup files found in the library metadata
         * @property rollups
         */
        this.rollups = null;

        /**
         * Whether or not to load optional dependencies for
         * the requested modules
         * @property loadOptional
         * @type boolean
         * @default false
         */
        this.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[]
         */
        this.sorted = [];

        /**
         * 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.
         * @propery loaded
         * @type {string: boolean}
         */
        this.loaded = GLOBAL_LOADED[VERSION];

        /**
         * A list of modules to attach to the YUI instance when complete.
         * If not supplied, the sorted list of dependencies are applied.
         * @property attaching
         */
        this.attaching = null;

        /**
         * Flag to indicate the dependency tree needs to be recomputed
         * if insert is called again.
         * @property dirty
         * @type boolean
         * @default true
         */
        this.dirty = true;

        /**
         * List of modules inserted by the utility
         * @property inserted
         * @type {string: boolean}
         */
        this.inserted = {};

        /**
         * List of skipped modules during insert() because the module
         * was not defined
         * @property skipped
         */
        this.skipped = {};

        // Y.on('yui:load', this.loadNext, this);

        this._config(o);

    };

    Y.Loader.prototype = {

        FILTER_DEFS: {
            RAW: {
                'searchExp': "-min\\.js",
                'replaceStr': ".js"
            },
            DEBUG: {
                'searchExp': "-min\\.js",
                'replaceStr': "-debug.js"
            }
        },

        SKIN_PREFIX: "skin-",

        _config: function(o) {

            var i, j, val, f;

            // apply config values
            if (o) {
                for (i in o) {
                    if (o.hasOwnProperty(i)) {
                        val = o[i];
                        if (i == 'require') {
                            this.require(val);
                        } else if (i == 'modules') {

                            // add a hash of module definitions
                            for (j in val) {
                                if (val.hasOwnProperty(j)) {
                                    this.addModule(val[j], j);
                                }
                            }

                        } else {
                            this[i] = val;
                        }
                    }
                }
            }

            // fix filter
            f = this.filter;

            if (L.isString(f)) {
                f = f.toUpperCase();
                this.filterName = f;
                this.filter = this.FILTER_DEFS[f];
            }

        },

        /**
         * 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 skin {string} the name of the skin
         * @param mod {string} optional: the name of a module to skin
         * @return {string} the full skin module name
         */
        formatSkin: function(skin, mod) {
            var s = this.SKIN_PREFIX + skin;
            if (mod) {
                s = s + "-" + mod;
            }

            return s;
        },

        /*
         * Reverses <code>formatSkin</code>, providing the skin name and
         * module name if the string matches the pattern for skins.
         * @method parseSkin
         * @param mod {string} the module name to parse
         * @return {skin: string, module: string} the parsed skin name
         * and module name, or null if the supplied string does not match
         * the skin pattern
         *
         * This isn't being used at the moment
         *
         */
        // parseSkin: function(mod) {
        //
        //     if (mod.indexOf(this.SKIN_PREFIX) === 0) {
        //         var a = mod.split("-");
        //         return {skin: a[1], module: a[2]};
        //     }
        //     return null;
        // },

        /**
         * Adds the skin def to the module info
         * @method _addSkin
         * @param skin {string} the name of the skin
         * @param mod {string} the name of the module
         * @param parent {string} 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 name = this.formatSkin(skin),
                info = this.moduleInfo,
                sinf = this.skin,
                ext  = info[mod] && info[mod].ext,
                mdef, pkg;

            /*
            // Add a module definition for the skin rollup css
            // Y.log('ext? ' + mod + ": " + ext);
            if (!info[name]) {
                // Y.log('adding skin ' + name);
                this.addModule({
                    'name': name,
                    'type': 'css',
                    'path': sinf.base + skin + '/' + sinf.path,
                    //'supersedes': '*',
                    'after': sinf.after,
                    'rollup': sinf.rollup,
                    'ext': 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;
                    // Y.log('adding skin ' + name);
                    this.addModule({
                        'name': name,
                        'type': 'css',
                        'after': sinf.after,
                        'path': (parent || pkg) + '/' + sinf.base + skin + '/' + mod + '.css',
                        'ext': ext
                    });
                }
            }

            return name;
        },

        /** Add a new module to the component metadata.
         * <dl>
         *     <dt>name:</dt>       <dd>required, the component name</dd>
         *     <dt>type:</dt>       <dd>required, the component type (js or css)</dd>
         *     <dt>path:</dt>       <dd>required, the path to the script from "base"</dd>
         *     <dt>requires:</dt>   <dd>array of modules required by this component</dd>
         *     <dt>optional:</dt>   <dd>array of optional modules for this component</dd>
         *     <dt>supersedes:</dt> <dd>array of the modules this component replaces</dd>
         *     <dt>after:</dt>      <dd>array of modules the components which, if present, should be sorted above this one</dd>
         *     <dt>rollup:</dt>     <dd>the number of superseded modules required for automatic rollup</dd>
         *     <dt>fullpath:</dt>   <dd>If fullpath is specified, this is used instead of the configured base + path</dd>
         *     <dt>skinnable:</dt>  <dd>flag to determine if skin assets should automatically be pulled in</dd>
         *     <dt>submodules:</dt> <dd>a has of submodules</dd>
         * </dl>
         * @method addModule
         * @param o An object containing the module data
         * @param name the module name (optional), required if not in the module data
         * @return {boolean} true if the module was added, false if
         * the object passed in did not provide all required attributes
         */
        addModule: function(o, name) {

            name = name || o.name;
            o.name = name;

            if (!o || !o.name) {
                return false;
            }

            if (!o.type) {
                o.type = JS;
            }

            if (!o.path && !o.fullpath) {
                // o.path = name + "/" + name + "-min." + o.type;
                o.path = _path(name, name, o.type);
            }

            o.ext = ('ext' in o) ? o.ext : (this._internal) ? false : true;
            o.requires = o.requires || [];

            // Y.log('New module ' + name);

            this.moduleInfo[name] = o;

            // Handle submodule logic
            var subs = o.submodules, i, l, sup, s, smod, plugins, plug;
            if (subs) {
                sup = [];
                l   = 0;

                for (i in subs) {
                    if (subs.hasOwnProperty(i)) {
                        s = subs[i];
                        s.path = _path(name, i, o.type);
                        this.addModule(s, i);
                        sup.push(i);

                        if (o.skinnable) {
                            smod = this._addSkin(this.skin.defaultSkin, i, name);
                            sup.push(smod.name);
                        }

                        l++;
                    }
                }

                o.supersedes = sup;
                o.rollup = Math.min(l-1, 4);
            }

            plugins = o.plugins;
            if (plugins) {
                for (i in plugins) {
                    if (plugins.hasOwnProperty(i)) {
                        plug = plugins[i];
                        plug.path = _path(name, i, o.type);
                        plug.requires = plug.requires || [];
                        plug.requires.push(name);
                        this.addModule(plug, i);
                        if (o.skinnable) {
                            this._addSkin(this.skin.defaultSkin, i, name);
                        }
                    }
                }
            }

            this.dirty = true;

            return o;
        },

        /**
         * Add a requirement for one or more module
         * @method require
         * @param what {string[] | string*} the modules to load
         */
        require: function(what) {
            var a = (typeof what === "string") ? arguments : what;
            this.dirty = true;
            Y.mix(this.required, Y.Array.hash(a));
        },

        /**
         * Returns an object containing properties for all modules required
         * in order to load the requested module
         * @method getRequires
         * @param mod The module definition from moduleInfo
         */
        getRequires: function(mod) {

            if (!mod) {
                // Y.log('getRequires, no module');
                return [];
            }

            if (!this.dirty && mod.expanded) {
                // Y.log('already expanded');
                return mod.expanded;
            }

            var i, d=[], r=mod.requires, o=mod.optional,
                info=this.moduleInfo, m, j, add;

            for (i=0; i<r.length; i=i+1) {
                // Y.log(mod.name + ' requiring ' + r[i]);
                d.push(r[i]);
                m = this.getModule(r[i]);
                add = this.getRequires(m);
                for (j=0;j<add.length;j=j+1) {
                    d.push(add[j]);
                }
            }

            // get the requirements from superseded modules, if any
            r=mod.supersedes;
            if (r) {
                for (i=0; i<r.length; i=i+1) {
                    // Y.log(mod.name + ' requiring ' + r[i]);
                    d.push(r[i]);
                    m = this.getModule(r[i]);
                    add = this.getRequires(m);
                    for (j=0;j<add.length;j=j+1) {
                        d.push(add[j]);
                    }
                }
            }

            if (o && this.loadOptional) {
                for (i=0; i<o.length; i=i+1) {
                    d.push(o[i]);
                    add = this.getRequires(info[o[i]]);
                    for (j=0;j<add.length;j=j+1) {
                        d.push(add[j]);
                    }
                }
            }

            mod.expanded = Y.Object.keys(Y.Array.hash(d));

            // Y.log(mod.expanded);

            return mod.expanded;
        },

        /**
         * Returns an object literal of the modules the supplied module satisfies
         * @method getProvides
         * @param name{string} The name of the module
         * @param notMe {string} don't add this module name, only include superseded modules
         * @return what this module provides
         */
        getProvides: function(name, notMe) {
            var addMe = !(notMe), ckey = (addMe) ? PROV : SUPER,
                m = this.getModule(name), o = {},
                s, done, me, i,

                // use worker to break cycles
                add = function(mm) {
                    if (!done[mm]) {
                        // Y.log(name + ' provides worker trying: ' + mm);
                        done[mm] = true;
                        // we always want the return value normal behavior
                        // (provides) for superseded modules.
                        Y.mix(o, me.getProvides(mm));
                    }

                    // else {
                    // Y.log(name + ' provides worker skipping done: ' + mm);
                    // }
                };

            if (!m) {
                return o;
            }

            if (m[ckey]) {
    // Y.log('cached: ' + name + ' ' + ckey + ' ' + L.dump(this.moduleInfo[name][ckey], 0));
                return m[ckey];
            }

            s    = m.supersedes;
            done = {};
            me   = this;

            // calculate superseded modules
            if (s) {
                for (i=0; i<s.length; i=i+1) {
                    add(s[i]);
                }
            }

            // supersedes cache
            m[SUPER] = o;
            // provides cache
            m[PROV] = Y.merge(o);
            m[PROV][name] = true;

    // Y.log(name + " supersedes " + L.dump(m[SUPER], 0));
    // Y.log(name + " provides " + L.dump(m[PROV], 0));

            return m[ckey];
        },

        /**
         * Calculates the dependency tree, the result is stored in the sorted
         * property
         * @method calculate
         * @param o optional options object
         */
        calculate: function(o) {
            if (o || this.dirty) {
                this._config(o);
                this._setup();
                this._explode();
                if (this.allowRollup && !this.combine) {
                    this._rollup();
                }
                this._reduce();
                this._sort();

                // Y.log("after calculate: " + this.sorted);

                this.dirty = false;
            }
        },

        /**
         * 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, o, l, smod;

            // Create skin modules
            for (name in info) {
                if (info.hasOwnProperty(name)) {
                    m = info[name];
                    if (m && m.skinnable) {
                        // Y.log("skinning: " + name);
                        o = this.skin.overrides;
                        if (o && o[name]) {
                            for (i=0; i<o[name].length; i=i+1) {
                                smod = this._addSkin(o[name][i], name);
                            }
                        } else {
                            smod = this._addSkin(this.skin.defaultSkin, name);
                        }

                        m.requires.push(smod);
                    }
                }
            }

            l = Y.merge(this.inserted); // shallow clone

            // available modules
            if (!this.ignoreRegistered) {
                Y.mix(l, GLOBAL_ENV.mods);
            }

            // Y.log("Already loaded stuff: " + L.dump(l, 0));

            // add the ignore list to the list of loaded packages
            if (this.ignore) {
                // OU.appendArray(l, this.ignore);
                Y.mix(l, Y.Array.hash(this.ignore));
            }

            // expand the list to include superseded modules
            for (j in l) {
                // Y.log("expanding: " + j);
                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=i+1) {
                    if (this.force[i] in l) {
                        delete l[this.force[i]];
                    }
                }
            }

            // Y.log("loaded expanded: " + L.dump(l, 0));

            Y.mix(this.loaded, l);

            // this.loaded = l;

        },

        /**
         * 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() {

            var r=this.required, i, mod, req, me = this, f = function(name) {

                    mod = me.getModule(name);

                    var expound = mod && mod.expound;
                    // Y.log('exploding ' + i);

                    if (mod) {

                        if (expound) {
                            r[expound] = me.getModule(expound);
                            req = me.getRequires(r[expound]);
                            Y.mix(r, Y.Array.hash(req));
                        }

                        req = me.getRequires(mod);

                        // Y.log('via explode: ' + req);
                        Y.mix(r, Y.Array.hash(req));
                    }
                };

            for (i in r) {
                if (r.hasOwnProperty(i)) {
                    f(i);
                }
            }
        },

        getModule: function(name) {

            var m = this.moduleInfo[name];

            // create the default module
            // if (!m) {
                // Y.log('Module does not exist: ' + name + ', creating with defaults');
                // m = this.addModule({ext: false}, name);
            // }

            return m;
        },

        /**
         * Look for rollup packages to determine if all of the modules a
         * rollup supersedes are required.  If so, include the rollup to
         * help reduce the total number of connections required.  Called
         * by calculate()
         * @method _rollup
         * @private
         */
        _rollup: function() {
            var i, j, m, s, rollups={}, r=this.required, roll,
                info = this.moduleInfo, rolled, c;

            // find and cache rollup modules
            if (this.dirty || !this.rollups) {
                for (i in info) {
                    if (info.hasOwnProperty(i)) {
                        m = this.getModule(i);
                        // if (m && m.rollup && m.supersedes) {
                        if (m && m.rollup) {
                            rollups[i] = m;
                        }
                    }
                }

                this.rollups = rollups;
                this.forceMap = (this.force) ? Y.Array.hash(this.force) : {};
            }

            // make as many passes as needed to pick up rollup rollups
            for (;;) {
                rolled = false;

                // go through the rollup candidates
                for (i in rollups) {

                    if (rollups.hasOwnProperty(i)) {

                        // there can be only one, unless forced
                        if (!r[i] && ((!this.loaded[i]) || this.forceMap[i])) {
                            m = this.getModule(i);
                            s = m.supersedes || [];
                            roll = false;

                            // @TODO remove continue
                            if (!m.rollup) {
                                continue;
                            }

                            c = 0;

                            // check the threshold
                            for (j=0;j<s.length;j=j+1) {

                                // if the superseded module is loaded, we can't load the rollup
                                // unless it has been forced
                                if (this.loaded[s[j]] && !this.forceMap[s[j]]) {
                                    roll = false;
                                    break;
                                // increment the counter if this module is required.  if we are
                                // beyond the rollup threshold, we will use the rollup module
                                } else if (r[s[j]]) {
                                    c++;
                                    // Y.log("adding to thresh: " + c + ", " + s[j]);
                                    roll = (c >= m.rollup);
                                    if (roll) {
                                        // Y.log("over thresh " + c + ", " + s[j]);
                                        break;
                                    }
                                }
                            }

                            if (roll) {
                                // Y.log("adding rollup: " +  i);
                                // add the rollup
                                r[i] = true;
                                rolled = true;

                                // expand the rollup's dependencies
                                this.getRequires(m);
                            }
                        }
                    }
                }

                // if we made it here w/o rolling up something, we are done
                if (!rolled) {
                    break;
                }
            }
        },

        /**
         * Remove superceded modules and loaded modules.  Called by
         * calculate() after we have the mega list of all dependencies
         * @method _reduce
         * @private
         */
        _reduce: function() {

            var i, j, s, m, r=this.required;
            for (i in r) {

                if (r.hasOwnProperty(i)) {

                    // remove if already loaded
                    if (this.loaded[i] && (!this.forceMap[i]) && !this.ignoreRegistered) {
                        delete r[i];

                    // remove anything this module supersedes
                    } else {

                         m = this.getModule(i);
                         s = m && m.supersedes;
                         if (s) {
                             for (j=0; j<s.length; j=j+1) {
                                 if (s[j] in r) {
                                     delete r[s[j]];
                                 }
                             }
                         }
                    }
                }
            }
        },

        _attach: function() {

            // this is the full list of items the YUI needs attached,
            // which is needed if some dependencies are already on
            // the page without their dependencies.
            if (this.attaching) {
                Y.log('attaching Y supplied deps: ' + this.attaching, "info", "loader");
                Y._attach(this.attaching);
            } else {
                Y.log('attaching sorted list: ' + this.sorted, "info", "loader");
                Y._attach(this.sorted);
            }

            // this._pushEvents();

        },

        _finish: function() {
            _queue.running = false;
            this._continue();
        },

        _onSuccess: function() {

            Y.log('loader successful: ' + Y.id, "info", "loader");

            this._attach();

            var skipped = this.skipped, i, f;

            for (i in skipped) {
                if (skipped.hasOwnProperty(i)) {
                    delete this.inserted[i];
                }
            }

            this.skipped = {};

            f = this.onSuccess;

            if (f) {
                f.call(this.context, {
                    msg: 'success',
                    data: this.data,
                    success: true
                });
            }

            this._finish();

        },

        _onFailure: function(o) {

            Y.log('load error: ' + o.msg + ', ' + Y.id, "error", "loader");

            this._attach();

            var f = this.onFailure;
            if (f) {
                f.call(this.context, {
                    msg: 'failure: ' + o.msg,
                    data: this.data,
                    success: false
                });
            }

            this._finish();
        },

        _onTimeout: function() {

            Y.log('loader timeout: ' + Y.id, "error", "loader");

            this._attach();

            var f = this.onTimeout;
            if (f) {
                f.call(this.context, {
                    msg: 'timeout',
                    data: this.data,
                    success: false
                });
            }

            this._finish();
        },

        /**
         * Sorts the dependency tree.  The last step of calculate()
         * @method _sort
         * @private
         */
        _sort: function() {
            // create an indexed list
            var s=Y.Object.keys(this.required), info=this.moduleInfo, loaded=this.loaded,
                p, l, a, b, j, k, moved,

            // returns true if b is not loaded, and is required
            // directly or by means of modules it supersedes.
                requires = function(aa, bb) {

                    var mm = info[aa], ii, rr, after, other, ss;

                    if (loaded[bb] || !mm) {
                        return false;
                    }

                    rr    = mm.expanded;
                    after = mm.after;
                    other = info[bb];

                    // check if this module requires the other directly
                    if (rr && Y.Array.indexOf(rr, bb) > -1) {
                        return true;
                    }

                    // check if this module should be sorted after the other
                    if (after && Y.Array.indexOf(after, bb) > -1) {
                        return true;
                    }

                    // check if this module requires one the other supersedes
                    ss = info[bb] && info[bb].supersedes;
                    if (ss) {
                        for (ii=0; ii<ss.length; ii=ii+1) {
                            if (requires(aa, ss[ii])) {
                                return true;
                            }
                        }
                    }

                    // external css files should be sorted below yui css
                    if (mm.ext && mm.type == CSS && !other.ext && other.type == CSS) {
                        return true;
                    }

                    return false;
                };

            // pointer to the first unsorted item
            p = 0;

            // 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=j+1) {

                    // 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=k+1) {
                        if (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]);

                            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 = p + 1;
                    }
                }

                // when we make it here and moved is false, we are
                // finished sorting
                if (!moved) {
                    break;
                }

            }

            this.sorted = s;
        },

        _insert: function(source, o, type) {

            // 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
            this.calculate(o);

            if (!type) {

                var self = this;

                // Y.log("trying to load css first");
                this._internalCallback = function() {
                            var f = self.onCSS;
                            if (f) {
                                f.call(self.context, Y);
                            }
                            self._internalCallback = null;
                            self._insert(null, null, JS);
                        };

                // _queue.running = false;
                this._insert(null, null, CSS);

                return;
            }

            // set a flag to indicate the load has started
            this._loading = true;

            // flag to indicate we are done with the combo service
            // and any additional files will need to be loaded
            // individually
            this._combineComplete = {};

            // keep the loadType (js, css or undefined) cached
            this.loadType = type;

            // start the load
            this.loadNext();

        },

        _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 o optional options object
         * @param type {string} the type of dependency to insert
         */
        insert: function(o, type) {

            var self = this, copy;

            Y.log('public insert() ' + type, "info", "loader");
            Y.log('public insert() ' + (type || '') + ', ' + Y.id, "info", "loader");

            copy = Y.merge(this, true);
            delete copy.require;
            delete copy.dirty;

            _queue.add(function() {
                self._insert(copy, o, type);
            });

            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
         * @param mname {string} optional the name of the module that has
         * been loaded (which is usually why it is time to load the next
         * one)
         */
        loadNext: function(mname) {

            // It is possible that this function is executed due to something
            // else one the page loading a YUI module.  Only react when we
            // are actively loading something
            if (!this._loading) {
                return;
            }

            var s, len, i, m, url, self=this, type=this.loadType, fn, msg, attr,
                callback=function(o) {
                    Y.log('Combo complete: ' + o.data, "info", "loader");
                    this._combineComplete[type] = true;

                    var c=this._combining, len=c.length, i;

                    for (i=0; i<len; i=i+1) {
                        this.inserted[c[i]] = true;
                    }

                    this.loadNext(o.data);
                },
                onsuccess=function(o) {
                    // Y.log('loading next, just loaded' + o.data);
                    self.loadNext(o.data);
                };

            // @TODO this will need to handle the two phase insert when
            // CSS support is added
            if (this.combine && (!this._combineComplete[type])) {

                this._combining = [];
                s=this.sorted;
                len=s.length;
                url=this.comboBase;

                for (i=0; i<len; i=i+1) {
                    m = this.getModule(s[i]);
                    // Do not try to combine non-yui JS
                    if (m && m.type === this.loadType && !m.ext) {
                        url += this.root + m.path;
                        if (i < len-1) {
                            url += '&';
                        }

                        this._combining.push(s[i]);
                    }
                }

                if (this._combining.length) {

    Y.log('Attempting to use combo: ' + this._combining, "info", "loader");

                    // if (m.type === CSS) {
                    if (this.loadType === CSS) {
                        fn = Y.Get.css;
                        attr = this.cssAttributes;
                    } else {
                        fn = Y.Get.script;
                        attr = this.jsAttributes;
                    }

                    // @TODO get rid of the redundant Get code
                    fn(this._filter(url), {
                        data: this._loading,
                        onSuccess: callback,
                        onFailure: this._onFailure,
                        onTimeout: this._onTimeout,
                        insertBefore: this.insertBefore,
                        charset: this.charset,
                        attributes: attr,
                        timeout: this.timeout,
                        autopurge: false,
                        context: self
                    });

                    return;

                } else {
                    this._combineComplete[type] = true;
                }
            }

            if (mname) {

                // if the module that was just loaded isn't what we were expecting,
                // continue to wait
                if (mname !== this._loading) {
                    return;
                }

    Y.log("loadNext executing, just loaded " + mname + ", " + Y.id, "info", "loader");

                // The global handler that is called when each module is loaded
                // will pass that module name to this function.  Storing this
                // data to avoid loading the same module multiple times
                this.inserted[mname] = true;
                this.loaded[mname] = true;

                if (this.onProgress) {
                    this.onProgress.call(this.context, {
                            name: mname,
                            data: this.data
                        });
                }

            }

            s=this.sorted;
            len=s.length;

            for (i=0; i<len; i=i+1) {

                // this.inserted keeps track of what the loader has loaded.
                // move on if this item is done.
                if (s[i] in this.inserted) {
                    // Y.log(s[i] + " alread loaded ");
                    continue;
                }

                // Because rollups will cause multiple load notifications
                // from Y, loadNext may be called multiple times for
                // the same module when loading a rollup.  We can safely
                // skip the subsequent requests
                if (s[i] === this._loading) {
                    Y.log("still loading " + s[i] + ", waiting", "info", "loader");
                    return;
                }

                // log("inserting " + s[i]);
                m = this.getModule(s[i]);

                if (!m) {

                    msg = "Undefined module " + s[i] + " skipped";
                    Y.log(msg, 'warn', 'loader');
                    this.inserted[s[i]] = true;
                    this.skipped[s[i]] = true;
                    continue;

                }

                // The load type is stored to offer the possibility to load
                // the css separately from the script.
                if (!type || type === m.type) {
                    this._loading = s[i];
                    Y.log("attempting to load " + s[i] + ", " + this.base, "info", "loader");

                    if (m.type === CSS) {
                        fn = Y.Get.css;
                        attr = this.cssAttributes;
                    } else {
                        fn = Y.Get.script;
                        attr = this.jsAttributes;
                    }

                    url = (m.fullpath) ? this._filter(m.fullpath, s[i]) : this._url(m.path, s[i]);

                    fn(url, {
                        data: s[i],
                        onSuccess: onsuccess,
                        insertBefore: this.insertBefore,
                        charset: this.charset,
                        attributes: attr,
                        onFailure: this._onFailure,
                        onTimeout: this._onTimeout,
                        timeout: this.timeout,
                        autopurge: false,
                        context: self
                    });

                    return;
                }
            }

            // we are finished
            this._loading = null;

            fn = this._internalCallback;

            // internal callback for loading css first
            if (fn) {
                // Y.log('loader internal');
                this._internalCallback = null;
                fn.call(this);

            // } else if (this.onSuccess) {
            } else {
                // Y.log('loader complete');
                // call Y.use passing this instance. Y will use the sorted
                // dependency list.
                this._onSuccess();
            }

        },

        /**
         * Apply filter defined for this instance to a url/path
         * method _filter
         * @param u {string} the string to filter
         * @param name {string} 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) {

            var f = this.filter,
                hasFilter = name && (name in this.filters),
                modFilter = hasFilter && this.filters[name];

            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 path {string} the path fragment
         * @return {string} the full url
         * @private
         */
        _url: function(path, name) {
            return this._filter((this.base || "") + path, name);
        }

    };

    })();

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