# Yahoo! UI Library

### DataTable Widget 2.9.0

Yahoo! UI Library > datatable > EventDelegate.js (source view)
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    /**
     * Augments the Event Utility with a <code>delegate</code> method that
     * facilitates easy creation of delegated event listeners.  (Note: Using CSS
     * selectors as the filtering criteria for delegated event listeners requires
     * inclusion of the Selector Utility.)
     *
     * @module event-delegate
     * @title Event Utility Event Delegation Module
     * @namespace YAHOO.util
     * @requires event
     */

    (function () {

        var Event = YAHOO.util.Event,
            Lang = YAHOO.lang,
            delegates = [],

            getMatch = function(el, selector, container) {

                var returnVal;

                if (!el || el === container) {
                    returnVal = false;
                }
                else {
                    returnVal = YAHOO.util.Selector.test(el, selector) ? el: getMatch(el.parentNode, selector, container);
                }

                return returnVal;

            };

        Lang.augmentObject(Event, {

            /**
             * Creates a delegate function used to call event listeners specified
             * via the <code>YAHOO.util.Event.delegate</code> method.
             *
             * @method _createDelegate
             *
             * @param {Function} fn        The method (event listener) to call.
             * @param {Function|string} filter Function or CSS selector used to
             * determine for what element(s) the event listener should be called.
             * @param {Object}   obj    An arbitrary object that will be
             *                             passed as a parameter to the listener.
             * @param {Boolean|object}  overrideContext  If true, the value of the
             *                             obj parameter becomes the execution context
             *                          of the listener. If an object, this object
             *                          becomes the execution context.
             * @return {Function} Function that will call the event listener
             * specified by the <code>YAHOO.util.Event.delegate</code> method.
             * @private
             * @for Event
             * @static
             */
            _createDelegate: function (fn, filter, obj, overrideContext) {

                return function (event) {

                    var container = this,
                        target = Event.getTarget(event),
                        selector = filter,

                        //    The user might have specified the document object
                        //    as the delegation container, in which case it is not
                        //    nessary to scope the provided CSS selector(s) to the
                        //    delegation container
                        bDocument = (container.nodeType === 9),

                        matchedEl,
                        context,
                        sID,
                        sIDSelector;

                    if (Lang.isFunction(filter)) {
                        matchedEl = filter(target);
                    }
                    else if (Lang.isString(filter)) {

                        if (!bDocument) {

                            sID = container.id;

                            if (!sID) {
                                sID = Event.generateId(container);
                            }

                            //    Scope all selectors to the container
                            sIDSelector = ("#" + sID + " ");
                            selector = (sIDSelector + filter).replace(/,/gi, ("," + sIDSelector));

                        }

                        if (YAHOO.util.Selector.test(target, selector)) {
                            matchedEl = target;
                        }
                        else if (YAHOO.util.Selector.test(target, ((selector.replace(/,/gi, " *,")) + " *"))) {

                            //    The target is a descendant of an element matching
                            //    the selector, so crawl up to find the ancestor that
                            //    matches the selector

                            matchedEl = getMatch(target, selector, container);

                        }

                    }

                    if (matchedEl) {

                        //    The default context for delegated listeners is the
                        //    element that matched the filter.

                        context = matchedEl;

                        if (overrideContext) {
                            if (overrideContext === true) {
                                context = obj;
                            } else {
                                context = overrideContext;
                            }
                        }

                        //    Call the listener passing in the container and the
                        //    element that matched the filter in case the user
                        //    needs those.

                        return fn.call(context, event, matchedEl, container, obj);

                    }

                };

            },

            /**
             * Appends a delegated event listener.  Delegated event listeners
             * receive three arguments by default: the DOM event, the element
             * specified by the filtering function or CSS selector, and the
             * container element (the element to which the event listener is
             * bound).  (Note: Using the delegate method requires the event-delegate
             * module.  Using CSS selectors as the filtering criteria for delegated
             * event listeners requires inclusion of the Selector Utility.)
             *
             * @method delegate
             *
             * @param {String|HTMLElement|Array|NodeList} container An id, an element
             *  reference, or a collection of ids and/or elements to assign the
             *  listener to.
             * @param {String}   type     The type of event listener to append
             * @param {Function} fn        The method the event invokes
             * @param {Function|string} filter Function or CSS selector used to
             * determine for what element(s) the event listener should be called.
             * When a function is specified, the function should return an
             * HTML element.  Using a CSS Selector requires the inclusion of the
             * CSS Selector Utility.
             * @param {Object}   obj    An arbitrary object that will be
             *                             passed as a parameter to the listener
             * @param {Boolean|object}  overrideContext  If true, the value of the obj parameter becomes
             *                             the execution context of the listener. If an
             *                             object, this object becomes the execution
             *                             context.
             * @return {Boolean} Returns true if the action was successful or defered,
             *                   false if one or more of the elements
             *                   could not have the listener attached,
             *                   or if the operation throws an exception.
             * @static
             * @for Event
             */
            delegate: function (container, type, fn, filter, obj, overrideContext) {

                var sType = type,
                    fnMouseDelegate,
                    fnDelegate;

                if (Lang.isString(filter) && !YAHOO.util.Selector) {
                    YAHOO.log("Using a CSS selector to define the filtering criteria for a delegated listener requires the Selector Utility.", "error", "Event");
                    return false;
                }

                if (type == "mouseenter" || type == "mouseleave") {

                    if (!Event._createMouseDelegate) {
                        YAHOO.log("Delegating a " + type + " event requires the event-mouseenter module.", "error", "Event");
                        return false;
                    }

                    //    Look up the real event--either mouseover or mouseout
                    sType = Event._getType(type);

                    fnMouseDelegate = Event._createMouseDelegate(fn, obj, overrideContext);

                    fnDelegate = Event._createDelegate(function (event, matchedEl, container) {

                        return fnMouseDelegate.call(matchedEl, event, container);

                    }, filter, obj, overrideContext);

                }
                else {

                    fnDelegate = Event._createDelegate(fn, filter, obj, overrideContext);

                }

                delegates.push([container, sType, fn, fnDelegate]);

                return Event.on(container, sType, fnDelegate);

            },

            /**
             * Removes a delegated event listener.
             *
             * @method removeDelegate
             *
             * @param {String|HTMLElement|Array|NodeList} container An id, an element
             *  reference, or a collection of ids and/or elements to remove
             *  the listener from.
             * @param {String} type The type of event to remove.
             * @param {Function} fn The method the event invokes.  If fn is
             *  undefined, then all event listeners for the type of event are
             *  removed.
             * @return {boolean} Returns true if the unbind was successful, false
             *  otherwise.
             * @static
             * @for Event
             */
            removeDelegate: function (container, type, fn) {

                var sType = type,
                    returnVal = false,
                    index,
                    cacheItem;

                //    Look up the real event--either mouseover or mouseout
                if (type == "mouseenter" || type == "mouseleave") {
                    sType = Event._getType(type);
                }

                index = Event._getCacheIndex(delegates, container, sType, fn);

                if (index >= 0) {
                    cacheItem = delegates[index];
                }

                if (container && cacheItem) {

                    returnVal = Event.removeListener(cacheItem[0], cacheItem[1], cacheItem[3]);

                    if (returnVal) {
                        delete delegates[index][2];
                        delete delegates[index][3];
                        delegates.splice(index, 1);
                    }

                }

                return returnVal;

            }

        });

    }());

    /**
     * Augments the Event Utility with support for the mouseenter and mouseleave
     * events:  A mouseenter event fires the first time the mouse enters an
     * element; a mouseleave event first the first time the mouse leaves an
     * element.
     *
     * @module event-mouseenter
     * @title Event Utility mouseenter and mouseout Module
     * @namespace YAHOO.util
     * @requires event
     */

    (function () {

        var Event = YAHOO.util.Event,
            Lang = YAHOO.lang,

            addListener = Event.addListener,
            removeListener = Event.removeListener,
            getListeners = Event.getListeners,

            delegates = [],

            specialTypes = {
                mouseenter: "mouseover",
                mouseleave: "mouseout"
            },

            remove = function(el, type, fn) {

                var index = Event._getCacheIndex(delegates, el, type, fn),
                    cacheItem,
                    returnVal;

                if (index >= 0) {
                    cacheItem = delegates[index];
                }

                if (el && cacheItem) {

                    //    removeListener will translate the value of type
                    returnVal = removeListener.call(Event, cacheItem[0], type, cacheItem[3]);

                    if (returnVal) {
                        delete delegates[index][2];
                        delete delegates[index][3];
                        delegates.splice(index, 1);
                    }

                }

                return returnVal;

            };

        Lang.augmentObject(Event._specialTypes, specialTypes);

        Lang.augmentObject(Event, {

            /**
             * Creates a delegate function used to call mouseover and mouseleave
             * event listeners specified via the
             * <code>YAHOO.util.Event.addListener</code>
             * or <code>YAHOO.util.Event.on</code> method.
             *
             * @method _createMouseDelegate
             *
             * @param {Function} fn        The method (event listener) to call
             * @param {Object}   obj    An arbitrary object that will be
             *                             passed as a parameter to the listener
             * @param {Boolean|object}  overrideContext  If true, the value of the
             *                             obj parameter becomes the execution context
             *                          of the listener. If an object, this object
             *                          becomes the execution context.
             * @return {Function} Function that will call the event listener
             * specified by either the <code>YAHOO.util.Event.addListener</code>
             * or <code>YAHOO.util.Event.on</code> method.
             * @private
             * @static
             * @for Event
             */
            _createMouseDelegate: function (fn, obj, overrideContext) {

                return function (event, container) {

                    var el = this,
                        relatedTarget = Event.getRelatedTarget(event),
                        context,
                        args;

                    if (el != relatedTarget && !YAHOO.util.Dom.isAncestor(el, relatedTarget)) {

                        context = el;

                        if (overrideContext) {
                            if (overrideContext === true) {
                                context = obj;
                            } else {
                                context = overrideContext;
                            }
                        }

                        // The default args passed back to a mouseenter or
                        // mouseleave listener are: the event, and any object
                        // the user passed when subscribing

                        args = [event, obj];

                        // Add the element and delegation container as arguments
                        // when delegating mouseenter and mouseleave

                        if (container) {
                            args.splice(1, 0, el, container);
                        }

                        return fn.apply(context, args);

                    }

                };

            },

            addListener: function (el, type, fn, obj, overrideContext) {

                var fnDelegate,
                    returnVal;

                if (specialTypes[type]) {

                    fnDelegate = Event._createMouseDelegate(fn, obj, overrideContext);

                    fnDelegate.mouseDelegate = true;

                    delegates.push([el, type, fn, fnDelegate]);

                    //    addListener will translate the value of type
                    returnVal = addListener.call(Event, el, type, fnDelegate);

                }
                else {
                    returnVal = addListener.apply(Event, arguments);
                }

                return returnVal;

            },

            removeListener: function (el, type, fn) {

                var returnVal;

                if (specialTypes[type]) {
                    returnVal = remove.apply(Event, arguments);
                }
                else {
                    returnVal = removeListener.apply(Event, arguments);
                }

                return returnVal;

            },

            getListeners: function (el, type) {

                //    If the user specified the type as mouseover or mouseout,
                //    need to filter out those used by mouseenter and mouseleave.
                //    If the user specified the type as mouseenter or mouseleave,
                //    need to filter out the true mouseover and mouseout listeners.

                var listeners = [],
                    elListeners,
                    bMouseOverOrOut = (type === "mouseover" || type === "mouseout"),
                    bMouseDelegate,
                    i,
                    l;

                if (type && (bMouseOverOrOut || specialTypes[type])) {

                    elListeners = getListeners.call(Event, el, this._getType(type));

                    if (elListeners) {

                        for (i=elListeners.length-1; i>-1; i--) {

                            l = elListeners[i];
                            bMouseDelegate = l.fn.mouseDelegate;

                            if ((specialTypes[type] && bMouseDelegate) || (bMouseOverOrOut && !bMouseDelegate)) {
                                listeners.push(l);
                            }

                        }

                    }

                }
                else {
                    listeners = getListeners.apply(Event, arguments);
                }

                return (listeners && listeners.length) ? listeners : null;

            }

        }, true);

        Event.on = Event.addListener;

    }());
    YAHOO.register("event-mouseenter", YAHOO.util.Event, {version: "@VERSION@", build: "@BUILD@"});

    var Y = YAHOO,
        Y_DOM = YAHOO.util.Dom,
        EMPTY_ARRAY = [],
        Y_UA = Y.env.ua,
        Y_Lang = Y.lang,
        Y_DOC = document,
        Y_DOCUMENT_ELEMENT = Y_DOC.documentElement,

        Y_DOM_inDoc = Y_DOM.inDocument,
        Y_mix = Y_Lang.augmentObject,
        Y_guid = Y_DOM.generateId,

        Y_getDoc = function(element) {
            var doc = Y_DOC;
            if (element) {
                doc = (element.nodeType === 9) ? element : // element === document
                    element.ownerDocument || // element === DOM node
                    element.document || // element === window
                    Y_DOC; // default
            }

            return doc;
        },

        Y_Array = function(o, startIdx) {
            var l, a, start = startIdx || 0;

            // IE errors when trying to slice HTMLElement collections
            try {
                return Array.prototype.slice.call(o, start);
            } catch (e) {
                a = [];
                l = o.length;
                for (; start < l; start++) {
                    a.push(o[start]);
                }
                return a;
            }
        },

        Y_DOM_allById = function(id, root) {
            root = root || Y_DOC;
            var nodes = [],
                ret = [],
                i,
                node;

            if (root.querySelectorAll) {
                ret = root.querySelectorAll('[id="' + id + '"]');
            } else if (root.all) {
                nodes = root.all(id);

                if (nodes) {
                    // root.all may return HTMLElement or HTMLCollection.
                    // some elements are also HTMLCollection (FORM, SELECT).
                    if (nodes.nodeName) {
                        if (nodes.id === id) { // avoid false positive on name
                            ret.push(nodes);
                            nodes = EMPTY_ARRAY; // done, no need to filter
                        } else { //  prep for filtering
                            nodes = [nodes];
                        }
                    }

                    if (nodes.length) {
                        // filter out matches on node.name
                        // and element.id as reference to element with id === 'id'
                        for (i = 0; node = nodes[i++];) {
                            if (node.id === id  ||
                                    (node.attributes && node.attributes.id &&
                                    node.attributes.id.value === id)) {
                                ret.push(node);
                            }
                        }
                    }
                }
            } else {
                ret = [Y_getDoc(root).getElementById(id)];
            }

            return ret;
        };

    /**
     * The selector-native module provides support for native querySelector
     * @module dom
     * @submodule selector-native
     * @for Selector
     */

    /**
     * Provides support for using CSS selectors to query the DOM
     * @class Selector
     * @static
     * @for Selector
     */

    var COMPARE_DOCUMENT_POSITION = 'compareDocumentPosition',
        OWNER_DOCUMENT = 'ownerDocument',

    Selector = {
        _foundCache: [],

        useNative: true,

        _compare: ('sourceIndex' in Y_DOCUMENT_ELEMENT) ?
            function(nodeA, nodeB) {
                var a = nodeA.sourceIndex,
                    b = nodeB.sourceIndex;

                if (a === b) {
                    return 0;
                } else if (a > b) {
                    return 1;
                }

                return -1;

            } : (Y_DOCUMENT_ELEMENT[COMPARE_DOCUMENT_POSITION] ?
            function(nodeA, nodeB) {
                if (nodeA[COMPARE_DOCUMENT_POSITION](nodeB) & 4) {
                    return -1;
                } else {
                    return 1;
                }
            } :
            function(nodeA, nodeB) {
                var rangeA, rangeB, compare;
                if (nodeA && nodeB) {
                    rangeA = nodeA[OWNER_DOCUMENT].createRange();
                    rangeA.setStart(nodeA, 0);
                    rangeB = nodeB[OWNER_DOCUMENT].createRange();
                    rangeB.setStart(nodeB, 0);
                    compare = rangeA.compareBoundaryPoints(1, rangeB); // 1 === Range.START_TO_END
                }

                return compare;

        }),

        _sort: function(nodes) {
            if (nodes) {
                nodes = Y_Array(nodes, 0, true);
                if (nodes.sort) {
                    nodes.sort(Selector._compare);
                }
            }

            return nodes;
        },

        _deDupe: function(nodes) {
            var ret = [],
                i, node;

            for (i = 0; (node = nodes[i++]);) {
                if (!node._found) {
                    ret[ret.length] = node;
                    node._found = true;
                }
            }

            for (i = 0; (node = ret[i++]);) {
                node._found = null;
                node.removeAttribute('_found');
            }

            return ret;
        },

        /**
         * Retrieves a set of nodes based on a given CSS selector.
         * @method query
         *
         * @param {string} selector The CSS Selector to test the node against.
         * @param {HTMLElement} root optional An HTMLElement to start the query from. Defaults to Y.config.doc
         * @param {Boolean} firstOnly optional Whether or not to return only the first match.
         * @return {Array} An array of nodes that match the given selector.
         * @static
         */
        query: function(selector, root, firstOnly, skipNative) {
            if (typeof root == 'string') {
                root = Y_DOM.get(root);
                if (!root) {
                    return (firstOnly) ? null : [];
                }
            } else {
                root = root || Y_DOC;
            }

            var ret = [],
                useNative = (Selector.useNative && Y_DOC.querySelector && !skipNative),
                queries = [[selector, root]],
                query,
                result,
                i,
                fn = (useNative) ? Selector._nativeQuery : Selector._bruteQuery;

            if (selector && fn) {
                // split group into seperate queries
                if (!skipNative && // already done if skipping
                        (!useNative || root.tagName)) { // split native when element scoping is needed
                    queries = Selector._splitQueries(selector, root);
                }

                for (i = 0; (query = queries[i++]);) {
                    result = fn(query[0], query[1], firstOnly);
                    if (!firstOnly) { // coerce DOM Collection to Array
                        result = Y_Array(result, 0, true);
                    }
                    if (result) {
                        ret = ret.concat(result);
                    }
                }

                if (queries.length > 1) { // remove dupes and sort by doc order
                    ret = Selector._sort(Selector._deDupe(ret));
                }
            }

            Y.log('query: ' + selector + ' returning: ' + ret.length, 'info', 'Selector');
            return (firstOnly) ? (ret[0] || null) : ret;

        },

        // allows element scoped queries to begin with combinator
        // e.g. query('> p', document.body) === query('body > p')
        _splitQueries: function(selector, node) {
            var groups = selector.split(','),
                queries = [],
                prefix = '',
                i, len;

            if (node) {
                // enforce for element scoping
                if (node.tagName) {
                    node.id = node.id || Y_guid();
                    prefix = '[id="' + node.id + '"] ';
                }

                for (i = 0, len = groups.length; i < len; ++i) {
                    selector =  prefix + groups[i];
                    queries.push([selector, node]);
                }
            }

            return queries;
        },

        _nativeQuery: function(selector, root, one) {
            if (Y_UA.webkit && selector.indexOf(':checked') > -1 &&
                    (Selector.pseudos && Selector.pseudos.checked)) { // webkit (chrome, safari) fails to find "selected"
                return Selector.query(selector, root, one, true); // redo with skipNative true to try brute query
            }
            try {
                //Y.log('trying native query with: ' + selector, 'info', 'selector-native');
                return root['querySelector' + (one ? '' : 'All')](selector);
            } catch(e) { // fallback to brute if available
                //Y.log('native query error; reverting to brute query with: ' + selector, 'info', 'selector-native');
                return Selector.query(selector, root, one, true); // redo with skipNative true
            }
        },

        filter: function(nodes, selector) {
            var ret = [],
                i, node;

            if (nodes && selector) {
                for (i = 0; (node = nodes[i++]);) {
                    if (Selector.test(node, selector)) {
                        ret[ret.length] = node;
                    }
                }
            } else {
                Y.log('invalid filter input (nodes: ' + nodes +
                        ', selector: ' + selector + ')', 'warn', 'Selector');
            }

            return ret;
        },

        test: function(node, selector, root) {
            var ret = false,
                groups = selector.split(','),
                useFrag = false,
                parent,
                item,
                items,
                frag,
                i, j, group;

            if (node && node.tagName) { // only test HTMLElements

                // we need a root if off-doc
                if (!root && !Y_DOM_inDoc(node)) {
                    parent = node.parentNode;
                    if (parent) {
                        root = parent;
                    } else { // only use frag when no parent to query
                        frag = node[OWNER_DOCUMENT].createDocumentFragment();
                        frag.appendChild(node);
                        root = frag;
                        useFrag = true;
                    }
                }
                root = root || node[OWNER_DOCUMENT];

                if (!node.id) {
                    node.id = Y_guid();
                }
                for (i = 0; (group = groups[i++]);) { // TODO: off-dom test
                    group += '[id="' + node.id + '"]';
                    items = Selector.query(group, root);

                    for (j = 0; item = items[j++];) {
                        if (item === node) {
                            ret = true;
                            break;
                        }
                    }
                    if (ret) {
                        break;
                    }
                }

                if (useFrag) { // cleanup
                    frag.removeChild(node);
                }
            }

            return ret;
        }

    };

    YAHOO.util.Selector = Selector;
    /**
     * The selector module provides helper methods allowing CSS2 Selectors to be used with DOM elements.
     * @module dom
     * @submodule selector-css2
     * @for Selector
     */

    /**
     * Provides helper methods for collecting and filtering DOM elements.
     */

    var PARENT_NODE = 'parentNode',
        TAG_NAME = 'tagName',
        ATTRIBUTES = 'attributes',
        COMBINATOR = 'combinator',
        PSEUDOS = 'pseudos',

        SelectorCSS2 = {
            _reRegExpTokens: /([\^\$\?\[\]\*\+\-\.\(\)\|\\])/, // TODO: move?
            SORT_RESULTS: true,
            _children: function(node, tag) {
                var ret = node.children,
                    i,
                    children = [],
                    childNodes,
                    child;

                if (node.children && tag && node.children.tags) {
                    children = node.children.tags(tag);
                } else if ((!ret && node[TAG_NAME]) || (ret && tag)) { // only HTMLElements have children
                    childNodes = ret || node.childNodes;
                    ret = [];
                    for (i = 0; (child = childNodes[i++]);) {
                        if (child.tagName) {
                            if (!tag || tag === child.tagName) {
                                ret.push(child);
                            }
                        }
                    }
                }

                return ret || [];
            },

            _re: {
                //attr: /(\[.*\])/g,
                attr: /(\[[^\]]*\])/g,
                //esc: /\\[:\[][\w\d\]]*/gi,
                esc: /\\[:\[\]\(\)#\.\'\>+~"]/gi,
                //pseudos: /:([\-\w]+(?:\(?:['"]?(.+)['"]?\))*)/i
                pseudos: /(\([^\)]*\))/g
            },

            /**
             * Mapping of shorthand tokens to corresponding attribute selector
             * @property shorthand
             * @type object
             */
            shorthand: {
                //'\\#([^\\s\\\\(\\[:]*)': '[id=$1]',
                '\\#(-?[_a-z]+[-\\w\\uE000]*)': '[id=$1]',
                //'\\#([^\\s\\\.:\\[\\]]*)': '[id=$1]',
                //'\\.([^\\s\\\\(\\[:]*)': '[className=$1]'
                '\\.(-?[_a-z]+[-\\w\\uE000]*)': '[className~=$1]'
            },

            /**
             * List of operators and corresponding boolean functions.
             * These functions are passed the attribute and the current node's value of the attribute.
             * @property operators
             * @type object
             */
            operators: {
                '': function(node, attr) { return !!node.getAttribute(attr); }, // Just test for existence of attribute
                //'': '.+',
                //'=': '^{val}$', // equality
                '~=': '(?:^|\\s+){val}(?:\\s+|$)', // space-delimited
                '|=': '^{val}(?:-|$)' // optional hyphen-delimited
            },

            pseudos: {
               'first-child': function(node) {
                    return Selector._children(node[PARENT_NODE])[0] === node;
                }
            },

            _bruteQuery: function(selector, root, firstOnly) {
                var ret = [],
                    nodes = [],
                    tokens = Selector._tokenize(selector),
                    token = tokens[tokens.length - 1],
                    rootDoc = Y_getDoc(root),
                    child,
                    id,
                    className,
                    tagName;

                // if we have an initial ID, set to root when in document
                /*
                if (tokens[0] && rootDoc === root &&
                        (id = tokens[0].id) &&
                        rootDoc.getElementById(id)) {
                    root = rootDoc.getElementById(id);
                }
                */

                if (token) {
                    // prefilter nodes
                    id = token.id;
                    className = token.className;
                    tagName = token.tagName || '*';

                    if (root.getElementsByTagName) { // non-IE lacks DOM api on doc frags
                        // try ID first, unless no root.all && root not in document
                        // (root.all works off document, but not getElementById)
                        // TODO: move to allById?
                        if (id && (root.all || (root.nodeType === 9 || Y_DOM_inDoc(root)))) {
                            nodes = Y_DOM_allById(id, root);
                        // try className
                        } else if (className) {
                            nodes = root.getElementsByClassName(className);
                        } else { // default to tagName
                            nodes = root.getElementsByTagName(tagName);
                        }

                    } else { // brute getElementsByTagName('*')
                        child = root.firstChild;
                        while (child) {
                            if (child.tagName) { // only collect HTMLElements
                                nodes.push(child);
                            }
                            child = child.nextSilbing || child.firstChild;
                        }
                    }
                    if (nodes.length) {
                        ret = Selector._filterNodes(nodes, tokens, firstOnly);
                    }
                }

                return ret;
            },

            _filterNodes: function(nodes, tokens, firstOnly) {
                var i = 0,
                    j,
                    len = tokens.length,
                    n = len - 1,
                    result = [],
                    node = nodes[0],
                    tmpNode = node,
                    getters = Selector.getters,
                    operator,
                    combinator,
                    token,
                    path,
                    pass,
                    //FUNCTION = 'function',
                    value,
                    tests,
                    test;

                //do {
                for (i = 0; (tmpNode = node = nodes[i++]);) {
                    n = len - 1;
                    path = null;

                    testLoop:
                    while (tmpNode && tmpNode.tagName) {
                        token = tokens[n];
                        tests = token.tests;
                        j = tests.length;
                        if (j && !pass) {
                            while ((test = tests[--j])) {
                                operator = test[1];
                                if (getters[test[0]]) {
                                    value = getters[test[0]](tmpNode, test[0]);
                                } else {
                                    value = tmpNode[test[0]];
                                    // use getAttribute for non-standard attributes
                                    if (value === undefined && tmpNode.getAttribute) {
                                        value = tmpNode.getAttribute(test[0]);
                                    }
                                }

                                if ((operator === '=' && value !== test[2]) ||  // fast path for equality
                                    (typeof operator !== 'string' && // protect against String.test monkey-patch (Moo)
                                    operator.test && !operator.test(value)) ||  // regex test
                                    (!operator.test && // protect against RegExp as function (webkit)
                                            typeof operator === 'function' && !operator(tmpNode, test[0], test[2]))) { // function test

                                    // skip non element nodes or non-matching tags
                                    if ((tmpNode = tmpNode[path])) {
                                        while (tmpNode &&
                                            (!tmpNode.tagName ||
                                                (token.tagName && token.tagName !== tmpNode.tagName))
                                        ) {
                                            tmpNode = tmpNode[path];
                                        }
                                    }
                                    continue testLoop;
                                }
                            }
                        }

                        n--; // move to next token
                        // now that we've passed the test, move up the tree by combinator
                        if (!pass && (combinator = token.combinator)) {
                            path = combinator.axis;
                            tmpNode = tmpNode[path];

                            // skip non element nodes
                            while (tmpNode && !tmpNode.tagName) {
                                tmpNode = tmpNode[path];
                            }

                            if (combinator.direct) { // one pass only
                                path = null;
                            }

                        } else { // success if we made it this far
                            result.push(node);
                            if (firstOnly) {
                                return result;
                            }
                            break;
                        }
                    }
                }// while (tmpNode = node = nodes[++i]);
                node = tmpNode = null;
                return result;
            },

            combinators: {
                ' ': {
                    axis: 'parentNode'
                },

                '>': {
                    axis: 'parentNode',
                    direct: true
                },

                '+': {
                    axis: 'previousSibling',
                    direct: true
                }
            },

            _parsers: [
                {
                    name: ATTRIBUTES,
                    //re: /^\[(-?[a-z]+[\w\-]*)+([~\|\^\$\*!=]=?)?['"]?([^\]]*?)['"]?\]/i,
                    re: /^\uE003(-?[a-z]+[\w\-]*)+([~\|\^\$\*!=]=?)?['"]?([^\uE004'"]*)['"]?\uE004/i,
                    fn: function(match, token) {
                        var operator = match[2] || '',
                            operators = Selector.operators,
                            escVal = (match[3]) ? match[3].replace(/\\/g, '') : '',
                            test;

                        // add prefiltering for ID and CLASS
                        if ((match[1] === 'id' && operator === '=') ||
                                (match[1] === 'className' &&
                                Y_DOCUMENT_ELEMENT.getElementsByClassName &&
                                (operator === '~=' || operator === '='))) {
                            token.prefilter = match[1];

                            match[3] = escVal;

                            // escape all but ID for prefilter, which may run through QSA (via Dom.allById)
                            token[match[1]] = (match[1] === 'id') ? match[3] : escVal;

                        }

                        // add tests
                        if (operator in operators) {
                            test = operators[operator];
                            if (typeof test === 'string') {
                                match[3] = escVal.replace(Selector._reRegExpTokens, '\\$1');
                                test = new RegExp(test.replace('{val}', match[3]));
                            }
                            match[2] = test;
                        }
                        if (!token.last || token.prefilter !== match[1]) {
                            return match.slice(1);
                        }
                    }

                },
                {
                    name: TAG_NAME,
                    re: /^((?:-?[_a-z]+[\w-]*)|\*)/i,
                    fn: function(match, token) {
                        var tag = match[1].toUpperCase();
                        token.tagName = tag;

                        if (tag !== '*' && (!token.last || token.prefilter)) {
                            return [TAG_NAME, '=', tag];
                        }
                        if (!token.prefilter) {
                            token.prefilter = 'tagName';
                        }
                    }
                },
                {
                    name: COMBINATOR,
                    re: /^\s*([>+~]|\s)\s*/,
                    fn: function(match, token) {
                    }
                },
                {
                    name: PSEUDOS,
                    re: /^:([\-\w]+)(?:\uE005['"]?([^\uE005]*)['"]?\uE006)*/i,
                    fn: function(match, token) {
                        var test = Selector[PSEUDOS][match[1]];
                        if (test) { // reorder match array and unescape special chars for tests
                            if (match[2]) {
                                match[2] = match[2].replace(/\\/g, '');
                            }
                            return [match[2], test];
                        } else { // selector token not supported (possibly missing CSS3 module)
                            return false;
                        }
                    }
                }
                ],

            _getToken: function(token) {
                return {
                    tagName: null,
                    id: null,
                    className: null,
                    attributes: {},
                    combinator: null,
                    tests: []
                };
            },

            /**
                Break selector into token units per simple selector.
                Combinator is attached to the previous token.
             */
            _tokenize: function(selector) {
                selector = selector || '';
                selector = Selector._replaceShorthand(Y_Lang.trim(selector));
                var token = Selector._getToken(),     // one token per simple selector (left selector holds combinator)
                    query = selector, // original query for debug report
                    tokens = [],    // array of tokens
                    found = false,  // whether or not any matches were found this pass
                    match,         // the regex match
                    test,
                    i, parser;

                /*
                    Search for selector patterns, store, and strip them from the selector string
                    until no patterns match (invalid selector) or we run out of chars.

                    Multiple attributes and pseudos are allowed, in any order.
                    for example:
                        'form:first-child[type=button]:not(button)[lang|=en]'
                */

                outer:
                do {
                    found = false; // reset after full pass

                    for (i = 0; (parser = Selector._parsers[i++]);) {
                        if ( (match = parser.re.exec(selector)) ) { // note assignment
                            if (parser.name !== COMBINATOR ) {
                                token.selector = selector;
                            }
                            selector = selector.replace(match[0], ''); // strip current match from selector
                            if (!selector.length) {
                                token.last = true;
                            }

                            if (Selector._attrFilters[match[1]]) { // convert class to className, etc.
                                match[1] = Selector._attrFilters[match[1]];
                            }

                            test = parser.fn(match, token);
                            if (test === false) { // selector not supported
                                found = false;
                                break outer;
                            } else if (test) {
                                token.tests.push(test);
                            }

                            if (!selector.length || parser.name === COMBINATOR) {
                                tokens.push(token);
                                token = Selector._getToken(token);
                                if (parser.name === COMBINATOR) {
                                    token.combinator = Selector.combinators[match[1]];
                                }
                            }
                            found = true;

                        }
                    }
                } while (found && selector.length);

                if (!found || selector.length) { // not fully parsed
                    Y.log('query: ' + query + ' contains unsupported token in: ' + selector, 'warn', 'Selector');
                    tokens = [];
                }
                return tokens;
            },

            _replaceShorthand: function(selector) {
                var shorthand = Selector.shorthand,
                    esc = selector.match(Selector._re.esc), // pull escaped colon, brackets, etc.
                    attrs,
                    pseudos,
                    re, i, len;

                if (esc) {
                    selector = selector.replace(Selector._re.esc, '\uE000');
                }

                attrs = selector.match(Selector._re.attr);
                pseudos = selector.match(Selector._re.pseudos);

                if (attrs) {
                    selector = selector.replace(Selector._re.attr, '\uE001');
                }

                if (pseudos) {
                    selector = selector.replace(Selector._re.pseudos, '\uE002');
                }

                for (re in shorthand) {
                    if (shorthand.hasOwnProperty(re)) {
                        selector = selector.replace(new RegExp(re, 'gi'), shorthand[re]);
                    }
                }

                if (attrs) {
                    for (i = 0, len = attrs.length; i < len; ++i) {
                        selector = selector.replace(/\uE001/, attrs[i]);
                    }
                }

                if (pseudos) {
                    for (i = 0, len = pseudos.length; i < len; ++i) {
                        selector = selector.replace(/\uE002/, pseudos[i]);
                    }
                }

                selector = selector.replace(/\[/g, '\uE003');
                selector = selector.replace(/\]/g, '\uE004');

                selector = selector.replace(/\(/g, '\uE005');
                selector = selector.replace(/\)/g, '\uE006');

                if (esc) {
                    for (i = 0, len = esc.length; i < len; ++i) {
                        selector = selector.replace('\uE000', esc[i]);
                    }
                }

                return selector;
            },

            _attrFilters: {
                'class': 'className',
                'for': 'htmlFor'
            },

            getters: {
                href: function(node, attr) {
                    return Y_DOM.getAttribute(node, attr);
                }
            }
        };

    Y_mix(Selector, SelectorCSS2, true);
    Selector.getters.src = Selector.getters.rel = Selector.getters.href;

    // IE wants class with native queries
    if (Selector.useNative && Y_DOC.querySelector) {
        Selector.shorthand['\\.([^\\s\\\\(\\[:]*)'] = '[class~=$1]';
    }

    /**
     * The selector css3 module provides support for css3 selectors.
     * @module dom
     * @submodule selector-css3
     * @for Selector
     */

    /*
        an+b = get every _a_th node starting at the _b_th
        0n+b = no repeat ("0" and "n" may both be omitted (together) , e.g. "0n+1" or "1", not "0+1"), return only the _b_th element
        1n+b =  get every element starting from b ("1" may may be omitted, e.g. "1n+0" or "n+0" or "n")
        an+0 = get every _a_th element, "0" may be omitted
    */

    Selector._reNth = /^(?:([\-]?\d*)(n){1}|(odd|even)$)*([\-+]?\d*)$/;

    Selector._getNth = function(node, expr, tag, reverse) {
        Selector._reNth.test(expr);
        var a = parseInt(RegExp.$1, 10), // include every _a_ elements (zero means no repeat, just first _a_)
            n = RegExp.$2, // "n"
            oddeven = RegExp.$3, // "odd" or "even"
            b = parseInt(RegExp.$4, 10) || 0, // start scan from element _b_
            result = [],
            siblings = Selector._children(node.parentNode, tag),
            op;

        if (oddeven) {
            a = 2; // always every other
            op = '+';
            n = 'n';
            b = (oddeven === 'odd') ? 1 : 0;
        } else if ( isNaN(a) ) {
            a = (n) ? 1 : 0; // start from the first or no repeat
        }

        if (a === 0) { // just the first
            if (reverse) {
                b = siblings.length - b + 1;
            }

            if (siblings[b - 1] === node) {
                return true;
            } else {
                return false;
            }

        } else if (a < 0) {
            reverse = !!reverse;
            a = Math.abs(a);
        }

        if (!reverse) {
            for (var i = b - 1, len = siblings.length; i < len; i += a) {
                if ( i >= 0 && siblings[i] === node ) {
                    return true;
                }
            }
        } else {
            for (var i = siblings.length - b, len = siblings.length; i >= 0; i -= a) {
                if ( i < len && siblings[i] === node ) {
                    return true;
                }
            }
        }
        return false;
    };

    Y_mix(Selector.pseudos, {
        'root': function(node) {
            return node === node.ownerDocument.documentElement;
        },

        'nth-child': function(node, expr) {
            return Selector._getNth(node, expr);
        },

        'nth-last-child': function(node, expr) {
            return Selector._getNth(node, expr, null, true);
        },

        'nth-of-type': function(node, expr) {
            return Selector._getNth(node, expr, node.tagName);
        },

        'nth-last-of-type': function(node, expr) {
            return Selector._getNth(node, expr, node.tagName, true);
        },

        'last-child': function(node) {
            var children = Selector._children(node.parentNode);
            return children[children.length - 1] === node;
        },

        'first-of-type': function(node) {
            return Selector._children(node.parentNode, node.tagName)[0] === node;
        },

        'last-of-type': function(node) {
            var children = Selector._children(node.parentNode, node.tagName);
            return children[children.length - 1] === node;
        },

        'only-child': function(node) {
            var children = Selector._children(node.parentNode);
            return children.length === 1 && children[0] === node;
        },

        'only-of-type': function(node) {
            var children = Selector._children(node.parentNode, node.tagName);
            return children.length === 1 && children[0] === node;
        },

        'empty': function(node) {
            return node.childNodes.length === 0;
        },

        'not': function(node, expr) {
            return !Selector.test(node, expr);
        },

        'contains': function(node, expr) {
            var text = node.innerText || node.textContent || '';
            return text.indexOf(expr) > -1;
        },

        'checked': function(node) {
            return (node.checked === true || node.selected === true);
        },

        enabled: function(node) {
            return (node.disabled !== undefined && !node.disabled);
        },

        disabled: function(node) {
            return (node.disabled);
        }
    });

    Y_mix(Selector.operators, {
        '^=': '^{val}', // Match starts with value
        '!=': function(node, attr, val) { return node[attr] !== val; }, // Match starts with value
        '$=': '{val}$', // Match ends with value
        '*=': '{val}' // Match contains value as substring
    });

    Selector.combinators['~'] = {
        axis: 'previousSibling'
    };
    YAHOO.register("selector", YAHOO.util.Selector, {version: "@VERSION@", build: "@BUILD@"});

Copyright © 2011 Yahoo! Inc. All rights reserved.