/*
 * This is code is also distributed under MIT license for use
 * with jQuery and prototype JavaScript libraries.
 */
/**
 * @class Ext.dom.Query
 * @alternateClassName Ext.DomQuery
 * @alternateClassName Ext.core.DomQuery
 * @singleton
 *
 * Provides high performance selector/xpath processing by compiling queries into reusable functions. New pseudo classes
 * and matchers can be plugged. It works on HTML and XML documents (if a content node is passed in).
 *
 * DomQuery supports most of the [CSS3 selectors spec][1], along with some custom selectors and basic XPath.
 *
 * All selectors, attribute filters and pseudos below can be combined infinitely in any order. For example
 * `div.foo:nth-child(odd)[@foo=bar].bar:first` would be a perfectly valid selector. Node filters are processed
 * in the order in which they appear, which allows you to optimize your queries for your document structure.
 *
 * ## Element Selectors:
 *
 *   - **`*`** any element
 *   - **`E`** an element with the tag E
 *   - **`E F`** All descendent elements of E that have the tag F
 *   - **`E > F`** or **E/F** all direct children elements of E that have the tag F
 *   - **`E + F`** all elements with the tag F that are immediately preceded by an element with the tag E
 *   - **`E ~ F`** all elements with the tag F that are preceded by a sibling element with the tag E
 *
 * ## Attribute Selectors:
 *
 * The use of `@` and quotes are optional. For example, `div[@foo='bar']` is also a valid attribute selector.
 *
 *   - **`E[foo]`** has an attribute "foo"
 *   - **`E[foo=bar]`** has an attribute "foo" that equals "bar"
 *   - **`E[foo^=bar]`** has an attribute "foo" that starts with "bar"
 *   - **`E[foo$=bar]`** has an attribute "foo" that ends with "bar"
 *   - **`E[foo*=bar]`** has an attribute "foo" that contains the substring "bar"
 *   - **`E[foo%=2]`** has an attribute "foo" that is evenly divisible by 2
 *   - **`E[foo!=bar]`** attribute "foo" does not equal "bar"
 *
 * ## Pseudo Classes:
 *
 *   - **`E:first-child`** E is the first child of its parent
 *   - **`E:last-child`** E is the last child of its parent
 *   - **`E:nth-child(_n_)`** E is the _n_th child of its parent (1 based as per the spec)
 *   - **`E:nth-child(odd)`** E is an odd child of its parent
 *   - **`E:nth-child(even)`** E is an even child of its parent
 *   - **`E:only-child`** E is the only child of its parent
 *   - **`E:checked`** E is an element that is has a checked attribute that is true (e.g. a radio or checkbox)
 *   - **`E:first`** the first E in the resultset
 *   - **`E:last`** the last E in the resultset
 *   - **`E:nth(_n_)`** the _n_th E in the resultset (1 based)
 *   - **`E:odd`** shortcut for :nth-child(odd)
 *   - **`E:even`** shortcut for :nth-child(even)
 *   - **`E:contains(foo)`** E's innerHTML contains the substring "foo"
 *   - **`E:nodeValue(foo)`** E contains a textNode with a nodeValue that equals "foo"
 *   - **`E:not(S)`** an E element that does not match simple selector S
 *   - **`E:has(S)`** an E element that has a descendent that matches simple selector S
 *   - **`E:next(S)`** an E element whose next sibling matches simple selector S
 *   - **`E:prev(S)`** an E element whose previous sibling matches simple selector S
 *   - **`E:any(S1|S2|S2)`** an E element which matches any of the simple selectors S1, S2 or S3
 *
 * ## CSS Value Selectors:
 *
 *   - **`E{display=none}`** css value "display" that equals "none"
 *   - **`E{display^=none}`** css value "display" that starts with "none"
 *   - **`E{display$=none}`** css value "display" that ends with "none"
 *   - **`E{display*=none}`** css value "display" that contains the substring "none"
 *   - **`E{display%=2}`** css value "display" that is evenly divisible by 2
 *   - **`E{display!=none}`** css value "display" that does not equal "none"
 *
 * [1]: http://www.w3.org/TR/2005/WD-css3-selectors-20051215/#selectors
 */
Ext.ns('Ext.core');

Ext.dom.Query = Ext.core.DomQuery = Ext.DomQuery = (function(){
    var cache = {},
        simpleCache = {},
        valueCache = {},
        nonSpace = /\S/,
        trimRe = /^\s+|\s+$/g,
        tplRe = /\{(\d+)\}/g,
        modeRe = /^(\s?[\/>+~]\s?|\s|$)/,
        tagTokenRe = /^(#)?([\w\-\*\\]+)/,
        nthRe = /(\d*)n\+?(\d*)/,
        nthRe2 = /\D/,
        startIdRe = /^\s*\#/,
        // This is for IE MSXML which does not support expandos.
        // IE runs the same speed using setAttribute, however FF slows way down
        // and Safari completely fails so they need to continue to use expandos.
        isIE = window.ActiveXObject ? true : false,
        key = 30803,
        longHex = /\\([0-9a-fA-F]{6})/g,
        shortHex = /\\([0-9a-fA-F]{1,6})\s{0,1}/g,
        nonHex = /\\([^0-9a-fA-F]{1})/g,
        escapes = /\\/g,
        num, hasEscapes,

        // replaces a long hex regex match group with the appropriate ascii value
        // $args indicate regex match pos
        longHexToChar = function($0, $1) {
            return String.fromCharCode(parseInt($1, 16));
        },

        // converts a shortHex regex match to the long form
        shortToLongHex = function($0, $1) {
            while ($1.length < 6) {
                $1 = '0' + $1;
            }
            return '\\' + $1;
        },

        // converts a single char escape to long escape form
        charToLongHex = function($0, $1) {
            num = $1.charCodeAt(0).toString(16);
            if (num.length === 1) {
                num = '0' + num;
            }
            return '\\0000' + num;
        },

        // Un-escapes an input selector string.  Assumes all escape sequences have been
        // normalized to the css '\\0000##' 6-hex-digit style escape sequence :
        // will not handle any other escape formats
        unescapeCssSelector = function (selector) {
            return (hasEscapes)
                ? selector.replace(longHex, longHexToChar)
                : selector;
        },
        
        // checks if the path has escaping & does any appropriate replacements
        setupEscapes = function(path){
            hasEscapes = (path.indexOf('\\') > -1);
            if (hasEscapes) {
                path = path
                    .replace(shortHex, shortToLongHex)
                    .replace(nonHex, charToLongHex)
                    .replace(escapes, '\\\\');  // double the '\' for js compilation
            }
            return path;
        };

    // this eval is stop the compressor from
    // renaming the variable to something shorter
    eval("var batch = 30803;");

    // Retrieve the child node from a particular
    // parent at the specified index.
    function child(parent, index){
        var i = 0,
            n = parent.firstChild;
        while(n){
            if(n.nodeType == 1){
               if(++i == index){
                   return n;
               }
            }
            n = n.nextSibling;
        }
        return null;
    }

    // retrieve the next element node
    function next(n){
        while((n = n.nextSibling) && n.nodeType != 1);
        return n;
    }

    // retrieve the previous element node
    function prev(n){
        while((n = n.previousSibling) && n.nodeType != 1);
        return n;
    }

    // Mark each child node with a nodeIndex skipping and
    // removing empty text nodes.
    function children(parent){
        var n = parent.firstChild,
        nodeIndex = -1,
        nextNode;
        while(n){
            nextNode = n.nextSibling;
            // clean worthless empty nodes.
            if(n.nodeType == 3 && !nonSpace.test(n.nodeValue)){
                parent.removeChild(n);
            }else{
                // add an expando nodeIndex
                n.nodeIndex = ++nodeIndex;
            }
            n = nextNode;
        }
        return this;
    }

    // nodeSet - array of nodes
    // cls - CSS Class
    function byClassName(nodeSet, cls){
        cls = unescapeCssSelector(cls);
        if(!cls){
            return nodeSet;
        }
        var result = [], ri = -1,
            i, ci;
        for(i = 0, ci; ci = nodeSet[i]; i++){
            if((' '+ci.className+' ').indexOf(cls) != -1){
                result[++ri] = ci;
            }
        }
        return result;
    }

    function attrValue(n, attr){
        // if its an array, use the first node.
        if(!n.tagName && typeof n.length != "undefined"){
            n = n[0];
        }
        if(!n){
            return null;
        }

        if(attr == "for"){
            return n.htmlFor;
        }
        if(attr == "class" || attr == "className"){
            return n.className;
        }
        return n.getAttribute(attr) || n[attr];

    }


    // ns - nodes
    // mode - false, /, >, +, ~
    // tagName - defaults to "*"
    function getNodes(ns, mode, tagName){
        var result = [], ri = -1, cs,
            i, ni, j, ci, cn, utag, n, cj;
        if(!ns){
            return result;
        }
        tagName = tagName || "*";
        // convert to array
        if(typeof ns.getElementsByTagName != "undefined"){
            ns = [ns];
        }

        // no mode specified, grab all elements by tagName
        // at any depth
        if(!mode){
            for(i = 0, ni; ni = ns[i]; i++){
                cs = ni.getElementsByTagName(tagName);
                for(j = 0, ci; ci = cs[j]; j++){
                    result[++ri] = ci;
                }
            }
        // Direct Child mode (/ or >)
        // E > F or E/F all direct children elements of E that have the tag
        } else if(mode == "/" || mode == ">"){
            utag = tagName.toUpperCase();
            for(i = 0, ni, cn; ni = ns[i]; i++){
                cn = ni.childNodes;
                for(j = 0, cj; cj = cn[j]; j++){
                    if(cj.nodeName == utag || cj.nodeName == tagName  || tagName == '*'){
                        result[++ri] = cj;
                    }
                }
            }
        // Immediately Preceding mode (+)
        // E + F all elements with the tag F that are immediately preceded by an element with the tag E
        }else if(mode == "+"){
            utag = tagName.toUpperCase();
            for(i = 0, n; n = ns[i]; i++){
                while((n = n.nextSibling) && n.nodeType != 1);
                if(n && (n.nodeName == utag || n.nodeName == tagName || tagName == '*')){
                    result[++ri] = n;
                }
            }
        // Sibling mode (~)
        // E ~ F all elements with the tag F that are preceded by a sibling element with the tag E
        }else if(mode == "~"){
            utag = tagName.toUpperCase();
            for(i = 0, n; n = ns[i]; i++){
                while((n = n.nextSibling)){
                    if (n.nodeName == utag || n.nodeName == tagName || tagName == '*'){
                        result[++ri] = n;
                    }
                }
            }
        }
        return result;
    }

    function concat(a, b){
        if(b.slice){
            return a.concat(b);
        }
        for(var i = 0, l = b.length; i < l; i++){
            a[a.length] = b[i];
        }
        return a;
    }

    function byTag(cs, tagName){
        if(cs.tagName || cs == document){
            cs = [cs];
        }
        if(!tagName){
            return cs;
        }
        var result = [], ri = -1,
            i, ci;
        tagName = tagName.toLowerCase();
        for(i = 0, ci; ci = cs[i]; i++){
            if(ci.nodeType == 1 && ci.tagName.toLowerCase() == tagName){
                result[++ri] = ci;
            }
        }
        return result;
    }

    function byId(cs, id){
        id = unescapeCssSelector(id);
        if(cs.tagName || cs == document){
            cs = [cs];
        }
        if(!id){
            return cs;
        }
        var result = [], ri = -1,
            i, ci;
        for(i = 0, ci; ci = cs[i]; i++){
            if(ci && ci.id == id){
                result[++ri] = ci;
                return result;
            }
        }
        return result;
    }

    // operators are =, !=, ^=, $=, *=, %=, |= and ~=
    // custom can be "{"
    function byAttribute(cs, attr, value, op, custom){
        var result = [],
            ri = -1,
            useGetStyle = custom == "{",
            fn = Ext.DomQuery.operators[op],
            a,
            xml,
            hasXml,
            i, ci;

        value = unescapeCssSelector(value);

        for(i = 0, ci; ci = cs[i]; i++){
            // skip non-element nodes.
            if(ci.nodeType != 1){
                continue;
            }
            // only need to do this for the first node
            if(!hasXml){
                xml = Ext.DomQuery.isXml(ci);
                hasXml = true;
            }

            // we only need to change the property names if we're dealing with html nodes, not XML
            if(!xml){
                if(useGetStyle){
                    a = Ext.DomQuery.getStyle(ci, attr);
                } else if (attr == "class" || attr == "className"){
                    a = ci.className;
                } else if (attr == "for"){
                    a = ci.htmlFor;
                } else if (attr == "href"){
                    // getAttribute href bug
                    // http://www.glennjones.net/Post/809/getAttributehrefbug.htm
                    a = ci.getAttribute("href", 2);
                } else{
                    a = ci.getAttribute(attr);
                }
            }else{
                a = ci.getAttribute(attr);
            }
            if((fn && fn(a, value)) || (!fn && a)){
                result[++ri] = ci;
            }
        }
        return result;
    }

    function byPseudo(cs, name, value){
        value = unescapeCssSelector(value);
        return Ext.DomQuery.pseudos[name](cs, value);
    }

    function nodupIEXml(cs){
        var d = ++key,
            r,
            i, len, c;
        cs[0].setAttribute("_nodup", d);
        r = [cs[0]];
        for(i = 1, len = cs.length; i < len; i++){
            c = cs[i];
            if(!c.getAttribute("_nodup") != d){
                c.setAttribute("_nodup", d);
                r[r.length] = c;
            }
        }
        for(i = 0, len = cs.length; i < len; i++){
            cs[i].removeAttribute("_nodup");
        }
        return r;
    }

    function nodup(cs){
        if(!cs){
            return [];
        }
        var len = cs.length, c, i, r = cs, cj, ri = -1, d, j;
        if(!len || typeof cs.nodeType != "undefined" || len == 1){
            return cs;
        }
        if(isIE && typeof cs[0].selectSingleNode != "undefined"){
            return nodupIEXml(cs);
        }
        d = ++key;
        cs[0]._nodup = d;
        for(i = 1; c = cs[i]; i++){
            if(c._nodup != d){
                c._nodup = d;
            }else{
                r = [];
                for(j = 0; j < i; j++){
                    r[++ri] = cs[j];
                }
                for(j = i+1; cj = cs[j]; j++){
                    if(cj._nodup != d){
                        cj._nodup = d;
                        r[++ri] = cj;
                    }
                }
                return r;
            }
        }
        return r;
    }

    function quickDiffIEXml(c1, c2){
        var d = ++key,
            r = [],
            i, len;
        for(i = 0, len = c1.length; i < len; i++){
            c1[i].setAttribute("_qdiff", d);
        }
        for(i = 0, len = c2.length; i < len; i++){
            if(c2[i].getAttribute("_qdiff") != d){
                r[r.length] = c2[i];
            }
        }
        for(i = 0, len = c1.length; i < len; i++){
           c1[i].removeAttribute("_qdiff");
        }
        return r;
    }

    function quickDiff(c1, c2){
        var len1 = c1.length,
            d = ++key,
            r = [],
            i, len;
        if(!len1){
            return c2;
        }
        if(isIE && typeof c1[0].selectSingleNode != "undefined"){
            return quickDiffIEXml(c1, c2);
        }
        for(i = 0; i < len1; i++){
            c1[i]._qdiff = d;
        }
        for(i = 0, len = c2.length; i < len; i++){
            if(c2[i]._qdiff != d){
                r[r.length] = c2[i];
            }
        }
        return r;
    }

    function quickId(ns, mode, root, id){
        if(ns == root){
            id = unescapeCssSelector(id);
            var d = root.ownerDocument || root;
            return d.getElementById(id);
        }
        ns = getNodes(ns, mode, "*");
        return byId(ns, id);
    }

    return {
        getStyle : function(el, name){
            return Ext.fly(el).getStyle(name);
        },
        /**
         * Compiles a selector/xpath query into a reusable function. The returned function
         * takes one parameter "root" (optional), which is the context node from where the query should start.
         * @param {String} selector The selector/xpath query
         * @param {String} [type="select"] Either "select" or "simple" for a simple selector match
         * @return {Function}
         */
        compile : function(path, type){
            type = type || "select";

            // setup fn preamble
            var fn = ["var f = function(root){\n var mode; ++batch; var n = root || document;\n"],
                mode,
                lastPath,
                matchers = Ext.DomQuery.matchers,
                matchersLn = matchers.length,
                modeMatch,
                // accept leading mode switch
                lmode = path.match(modeRe),
                tokenMatch, matched, j, t, m;

            path = setupEscapes(path);

            if(lmode && lmode[1]){
                fn[fn.length] = 'mode="'+lmode[1].replace(trimRe, "")+'";';
                path = path.replace(lmode[1], "");
            }

            // strip leading slashes
            while(path.substr(0, 1)=="/"){
                path = path.substr(1);
            }

            while(path && lastPath != path){
                lastPath = path;
                tokenMatch = path.match(tagTokenRe);
                if(type == "select"){
                    if(tokenMatch){
                        // ID Selector
                        if(tokenMatch[1] == "#"){
                            fn[fn.length] = 'n = quickId(n, mode, root, "'+tokenMatch[2]+'");';
                        }else{
                            fn[fn.length] = 'n = getNodes(n, mode, "'+tokenMatch[2]+'");';
                        }
                        path = path.replace(tokenMatch[0], "");
                    }else if(path.substr(0, 1) != '@'){
                        fn[fn.length] = 'n = getNodes(n, mode, "*");';
                    }
                // type of "simple"
                }else{
                    if(tokenMatch){
                        if(tokenMatch[1] == "#"){
                            fn[fn.length] = 'n = byId(n, "'+tokenMatch[2]+'");';
                        }else{
                            fn[fn.length] = 'n = byTag(n, "'+tokenMatch[2]+'");';
                        }
                        path = path.replace(tokenMatch[0], "");
                    }
                }
                while(!(modeMatch = path.match(modeRe))){
                    matched = false;
                    for(j = 0; j < matchersLn; j++){
                        t = matchers[j];
                        m = path.match(t.re);
                        if(m){
                            fn[fn.length] = t.select.replace(tplRe, function(x, i){
                                return m[i];
                            });
                            path = path.replace(m[0], "");
                            matched = true;
                            break;
                        }
                    }
                    // prevent infinite loop on bad selector
                    if(!matched){
                        Ext.Error.raise({
                            sourceClass: 'Ext.DomQuery',
                            sourceMethod: 'compile',
                            msg: 'Error parsing selector. Parsing failed at "' + path + '"'
                        });
                    }
                }
                if(modeMatch[1]){
                    fn[fn.length] = 'mode="'+modeMatch[1].replace(trimRe, "")+'";';
                    path = path.replace(modeMatch[1], "");
                }
            }
            // close fn out
            fn[fn.length] = "return nodup(n);\n}";

            // eval fn and return it
            eval(fn.join(""));
            return f;
        },

        /**
         * Selects an array of DOM nodes using JavaScript-only implementation.
         *
         * Use {@link #select} to take advantage of browsers built-in support for CSS selectors.
         * @param {String} selector The selector/xpath query (can be a comma separated list of selectors)
         * @param {HTMLElement/String} [root=document] The start of the query.
         * @return {HTMLElement[]} An Array of DOM elements which match the selector. If there are
         * no matches, and empty Array is returned.
         */
        jsSelect: function(path, root, type){
            // set root to doc if not specified.
            root = root || document;

            if(typeof root == "string"){
                root = document.getElementById(root);
            }
            var paths = path.split(","),
                results = [],
                i, len, subPath, result;

            // loop over each selector
            for(i = 0, len = paths.length; i < len; i++){
                subPath = paths[i].replace(trimRe, "");
                // compile and place in cache
                if(!cache[subPath]){
                    // When we compile, escaping is handled inside the compile method
                    cache[subPath] = Ext.DomQuery.compile(subPath, type);
                    if(!cache[subPath]){
                        Ext.Error.raise({
                            sourceClass: 'Ext.DomQuery',
                            sourceMethod: 'jsSelect',
                            msg: subPath + ' is not a valid selector'
                        });
                    }
                } else {
                    // If we've already compiled, we still need to check if the
                    // selector has escaping and setup the appropriate flags
                    setupEscapes(subPath);
                }
                result = cache[subPath](root);
                if(result && result != document){
                    results = results.concat(result);
                }
            }

            // if there were multiple selectors, make sure dups
            // are eliminated
            if(paths.length > 1){
                return nodup(results);
            }
            return results;
        },

        isXml: function(el) {
            var docEl = (el ? el.ownerDocument || el : 0).documentElement;
            return docEl ? docEl.nodeName !== "HTML" : false;
        },

        /**
         * Selects an array of DOM nodes by CSS/XPath selector.
         *
         * Uses [document.querySelectorAll][0] if browser supports that, otherwise falls back to
         * {@link Ext.dom.Query#jsSelect} to do the work.
         *
         * Aliased as {@link Ext#query}.
         *
         * [0]: https://developer.mozilla.org/en/DOM/document.querySelectorAll
         *
         * @param {String} path The selector/xpath query
         * @param {HTMLElement} [root=document] The start of the query.
         * @return {HTMLElement[]} An array of DOM elements (not a NodeList as returned by `querySelectorAll`).
         * @param {String} [type="select"] Either "select" or "simple" for a simple selector match (only valid when
         * used when the call is deferred to the jsSelect method)
         * @method
         */
        select : document.querySelectorAll ? function(path, root, type) {
            root = root || document;
            if (!Ext.DomQuery.isXml(root)) {
                try {
                    /*
                     * This checking here is to "fix" the behaviour of querySelectorAll
                     * for non root document queries. The way qsa works is intentional,
                     * however it's definitely not the expected way it should work.
                     * When descendant selectors are used, only the lowest selector must be inside the root!
                     * More info: http://ejohn.org/blog/thoughts-on-queryselectorall/
                     * So we create a descendant selector by prepending the root's ID, and query the parent node.
                     * UNLESS the root has no parent in which qsa will work perfectly.
                     *
                     * We only modify the path for single selectors (ie, no multiples),
                     * without a full parser it makes it difficult to do this correctly.
                     */
                    if (root.parentNode && (root.nodeType !== 9) && path.indexOf(',') === -1 && !startIdRe.test(path)) {
                        path = '#' + Ext.escapeId(Ext.id(root)) + ' ' + path;
                        root = root.parentNode;
                    }
                    return Ext.Array.toArray(root.querySelectorAll(path));
                }
                catch (e) {
                }
            }
            return Ext.DomQuery.jsSelect.call(this, path, root, type);
        } : function(path, root, type) {
            return Ext.DomQuery.jsSelect.call(this, path, root, type);
        },

        /**
         * Selects a single element.
         * @param {String} selector The selector/xpath query
         * @param {HTMLElement} [root=document] The start of the query.
         * @return {HTMLElement} The DOM element which matched the selector.
         */
        selectNode : function(path, root){
            return Ext.DomQuery.select(path, root)[0];
        },

        /**
         * Selects the value of a node, optionally replacing null with the defaultValue.
         * @param {String} selector The selector/xpath query
         * @param {HTMLElement} [root=document] The start of the query.
         * @param {String} [defaultValue] When specified, this is return as empty value.
         * @return {String}
         */
        selectValue : function(path, root, defaultValue){
            path = path.replace(trimRe, "");
            if (!valueCache[path]) {
                valueCache[path] = Ext.DomQuery.compile(path, "select");
            } else {
                setupEscapes(path);
            }
            
            var n = valueCache[path](root), 
                v;
                
            n = n[0] ? n[0] : n;

            // overcome a limitation of maximum textnode size
            // Rumored to potentially crash IE6 but has not been confirmed.
            // http://reference.sitepoint.com/javascript/Node/normalize
            // https://developer.mozilla.org/En/DOM/Node.normalize
            if (typeof n.normalize == 'function') {
                n.normalize();
            }

            v = (n && n.firstChild ? n.firstChild.nodeValue : null);
            return ((v === null||v === undefined||v==='') ? defaultValue : v);
        },

        /**
         * Selects the value of a node, parsing integers and floats.
         * Returns the defaultValue, or 0 if none is specified.
         * @param {String} selector The selector/xpath query
         * @param {HTMLElement} [root=document] The start of the query.
         * @param {Number} [defaultValue] When specified, this is return as empty value.
         * @return {Number}
         */
        selectNumber : function(path, root, defaultValue){
            var v = Ext.DomQuery.selectValue(path, root, defaultValue || 0);
            return parseFloat(v);
        },

        /**
         * Returns true if the passed element(s) match the passed simple selector
         * (e.g. `div.some-class` or `span:first-child`)
         * @param {String/HTMLElement/HTMLElement[]} el An element id, element or array of elements
         * @param {String} selector The simple selector to test
         * @return {Boolean}
         */
        is : function(el, ss){
            if(typeof el == "string"){
                el = document.getElementById(el);
            }
            var isArray = Ext.isArray(el),
                result = Ext.DomQuery.filter(isArray ? el : [el], ss);
            return isArray ? (result.length == el.length) : (result.length > 0);
        },

        /**
         * Filters an array of elements to only include matches of a simple selector
         * (e.g. `div.some-class` or `span:first-child`)
         * @param {HTMLElement[]} el An array of elements to filter
         * @param {String} selector The simple selector to test
         * @param {Boolean} nonMatches If true, it returns the elements that DON'T match the selector instead of the
         * ones that match
         * @return {HTMLElement[]} An Array of DOM elements which match the selector. If there are no matches, and empty
         * Array is returned.
         */
        filter : function(els, ss, nonMatches){
            ss = ss.replace(trimRe, "");
            if (!simpleCache[ss]) {
                simpleCache[ss] = Ext.DomQuery.compile(ss, "simple");
            } else {
                setupEscapes(ss);
            }
            
            var result = simpleCache[ss](els);
            return nonMatches ? quickDiff(result, els) : result;
        },

        /**
         * Collection of matching regular expressions and code snippets.
         * Each capture group within `()` will be replace the `{}` in the select
         * statement as specified by their index.
         */
        matchers : [{
                re: /^\.([\w\-\\]+)/,
                select: 'n = byClassName(n, " {1} ");'
            }, {
                re: /^\:([\w\-]+)(?:\(((?:[^\s>\/]*|.*?))\))?/,
                select: 'n = byPseudo(n, "{1}", "{2}");'
            },{
                re: /^(?:([\[\{])(?:@)?([\w\-]+)\s?(?:(=|.=)\s?['"]?(.*?)["']?)?[\]\}])/,
                select: 'n = byAttribute(n, "{2}", "{4}", "{3}", "{1}");'
            }, {
                re: /^#([\w\-\\]+)/,
                select: 'n = byId(n, "{1}");'
            },{
                re: /^@([\w\-]+)/,
                select: 'return {firstChild:{nodeValue:attrValue(n, "{1}")}};'
            }
        ],

        /**
         * Collection of operator comparison functions.
         * The default operators are `=`, `!=`, `^=`, `$=`, `*=`, `%=`, `|=` and `~=`.
         * New operators can be added as long as the match the format *c*`=` where *c*
         * is any character other than space, `>`, or `<`.
         */
        operators : {
            "=" : function(a, v){
                return a == v;
            },
            "!=" : function(a, v){
                return a != v;
            },
            "^=" : function(a, v){
                return a && a.substr(0, v.length) == v;
            },
            "$=" : function(a, v){
                return a && a.substr(a.length-v.length) == v;
            },
            "*=" : function(a, v){
                return a && a.indexOf(v) !== -1;
            },
            "%=" : function(a, v){
                return (a % v) == 0;
            },
            "|=" : function(a, v){
                return a && (a == v || a.substr(0, v.length+1) == v+'-');
            },
            "~=" : function(a, v){
                return a && (' '+a+' ').indexOf(' '+v+' ') != -1;
            }
        },

        /**
         * Object hash of "pseudo class" filter functions which are used when filtering selections.
         * Each function is passed two parameters:
         *
         * - **c** : Array
         *     An Array of DOM elements to filter.
         *
         * - **v** : String
         *     The argument (if any) supplied in the selector.
         *
         * A filter function returns an Array of DOM elements which conform to the pseudo class.
         * In addition to the provided pseudo classes listed above such as `first-child` and `nth-child`,
         * developers may add additional, custom psuedo class filters to select elements according to application-specific requirements.
         *
         * For example, to filter `a` elements to only return links to __external__ resources:
         *
         *     Ext.DomQuery.pseudos.external = function(c, v){
         *         var r = [], ri = -1;
         *         for(var i = 0, ci; ci = c[i]; i++){
         *             // Include in result set only if it's a link to an external resource
         *             if(ci.hostname != location.hostname){
         *                 r[++ri] = ci;
         *             }
         *         }
         *         return r;
         *     };
         *
         * Then external links could be gathered with the following statement:
         *
         *     var externalLinks = Ext.select("a:external");
         */
        pseudos : {
            "first-child" : function(c){
                var r = [], ri = -1, n,
                    i, ci;
                for(i = 0; (ci = n = c[i]); i++){
                    while((n = n.previousSibling) && n.nodeType != 1);
                    if(!n){
                        r[++ri] = ci;
                    }
                }
                return r;
            },

            "last-child" : function(c){
                var r = [], ri = -1, n,
                    i, ci;
                for(i = 0; (ci = n = c[i]); i++){
                    while((n = n.nextSibling) && n.nodeType != 1);
                    if(!n){
                        r[++ri] = ci;
                    }
                }
                return r;
            },

            "nth-child" : function(c, a) {
                var r = [], ri = -1,
                    m = nthRe.exec(a == "even" && "2n" || a == "odd" && "2n+1" || !nthRe2.test(a) && "n+" + a || a),
                    f = (m[1] || 1) - 0, l = m[2] - 0,
                    i, n, j, cn, pn;
                for(i = 0; n = c[i]; i++){
                    pn = n.parentNode;
                    if (batch != pn._batch) {
                        j = 0;
                        for(cn = pn.firstChild; cn; cn = cn.nextSibling){
                            if(cn.nodeType == 1){
                               cn.nodeIndex = ++j;
                            }
                        }
                        pn._batch = batch;
                    }
                    if (f == 1) {
                        if (l == 0 || n.nodeIndex == l){
                            r[++ri] = n;
                        }
                    } else if ((n.nodeIndex + l) % f == 0){
                        r[++ri] = n;
                    }
                }

                return r;
            },

            "only-child" : function(c){
                var r = [], ri = -1,
                    i, ci;
                for(i = 0; ci = c[i]; i++){
                    if(!prev(ci) && !next(ci)){
                        r[++ri] = ci;
                    }
                }
                return r;
            },

            "empty" : function(c){
                var r = [], ri = -1,
                    i, ci, cns, j, cn, empty;
                for(i = 0, ci; ci = c[i]; i++){
                    cns = ci.childNodes;
                    j = 0;
                    empty = true;
                    while(cn = cns[j]){
                        ++j;
                        if(cn.nodeType == 1 || cn.nodeType == 3){
                            empty = false;
                            break;
                        }
                    }
                    if(empty){
                        r[++ri] = ci;
                    }
                }
                return r;
            },

            "contains" : function(c, v){
                var r = [], ri = -1,
                    i, ci;
                for(i = 0; ci = c[i]; i++){
                    if((ci.textContent||ci.innerText||ci.text||'').indexOf(v) != -1){
                        r[++ri] = ci;
                    }
                }
                return r;
            },

            "nodeValue" : function(c, v){
                var r = [], ri = -1,
                    i, ci;
                for(i = 0; ci = c[i]; i++){
                    if(ci.firstChild && ci.firstChild.nodeValue == v){
                        r[++ri] = ci;
                    }
                }
                return r;
            },

            "checked" : function(c){
                var r = [], ri = -1,
                    i, ci;
                for(i = 0; ci = c[i]; i++){
                    if(ci.checked == true){
                        r[++ri] = ci;
                    }
                }
                return r;
            },

            "not" : function(c, ss){
                return Ext.DomQuery.filter(c, ss, true);
            },

            "any" : function(c, selectors){
                var ss = selectors.split('|'),
                    r = [], ri = -1, s,
                    i, ci, j;
                for(i = 0; ci = c[i]; i++){
                    for(j = 0; s = ss[j]; j++){
                        if(Ext.DomQuery.is(ci, s)){
                            r[++ri] = ci;
                            break;
                        }
                    }
                }
                return r;
            },

            "odd" : function(c){
                return this["nth-child"](c, "odd");
            },

            "even" : function(c){
                return this["nth-child"](c, "even");
            },

            "nth" : function(c, a){
                return c[a-1] || [];
            },

            "first" : function(c){
                return c[0] || [];
            },

            "last" : function(c){
                return c[c.length-1] || [];
            },

            "has" : function(c, ss){
                var s = Ext.DomQuery.select,
                    r = [], ri = -1,
                    i, ci;
                for(i = 0; ci = c[i]; i++){
                    if(s(ss, ci).length > 0){
                        r[++ri] = ci;
                    }
                }
                return r;
            },

            "next" : function(c, ss){
                var is = Ext.DomQuery.is,
                    r = [], ri = -1,
                    i, ci, n;
                for(i = 0; ci = c[i]; i++){
                    n = next(ci);
                    if(n && is(n, ss)){
                        r[++ri] = ci;
                    }
                }
                return r;
            },

            "prev" : function(c, ss){
                var is = Ext.DomQuery.is,
                    r = [], ri = -1,
                    i, ci, n;
                for(i = 0; ci = c[i]; i++){
                    n = prev(ci);
                    if(n && is(n, ss)){
                        r[++ri] = ci;
                    }
                }
                return r;
            }
        }
    };
}());

/**
 * Shorthand of {@link Ext.dom.Query#select}
 * @member Ext
 * @method query
 * @inheritdoc Ext.dom.Query#select
 */
Ext.query = Ext.DomQuery.select;

