/*!
 * Ext JS Library 3.2.1
 * Copyright(c) 2006-2010 Ext JS, Inc.
 * licensing@extjs.com
 * http://www.extjs.com/license
 */
/*
 * This is code is also distributed under MIT license for use
 * with jQuery and prototype JavaScript libraries.
 */
/**
 * @class Ext.DomQuery
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).
<p>
DomQuery supports most of the <a href="http://www.w3.org/TR/2005/WD-css3-selectors-20051215/#selectors">CSS3 selectors spec</a>, along with some custom selectors and basic XPath.</p>

<p>
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.
</p>
<h4>Element Selectors:</h4>
<ul class="list">
    <li> <b>*</b> any element</li>
    <li> <b>E</b> an element with the tag E</li>
    <li> <b>E F</b> All descendent elements of E that have the tag F</li>
    <li> <b>E > F</b> or <b>E/F</b> all direct children elements of E that have the tag F</li>
    <li> <b>E + F</b> all elements with the tag F that are immediately preceded by an element with the tag E</li>
    <li> <b>E ~ F</b> all elements with the tag F that are preceded by a sibling element with the tag E</li>
</ul>
<h4>Attribute Selectors:</h4>
<p>The use of &#64; and quotes are optional. For example, div[&#64;foo='bar'] is also a valid attribute selector.</p>
<ul class="list">
    <li> <b>E[foo]</b> has an attribute "foo"</li>
    <li> <b>E[foo=bar]</b> has an attribute "foo" that equals "bar"</li>
    <li> <b>E[foo^=bar]</b> has an attribute "foo" that starts with "bar"</li>
    <li> <b>E[foo$=bar]</b> has an attribute "foo" that ends with "bar"</li>
    <li> <b>E[foo*=bar]</b> has an attribute "foo" that contains the substring "bar"</li>
    <li> <b>E[foo%=2]</b> has an attribute "foo" that is evenly divisible by 2</li>
    <li> <b>E[foo!=bar]</b> has an attribute "foo" that does not equal "bar"</li>
</ul>
<h4>Pseudo Classes:</h4>
<ul class="list">
    <li> <b>E:first-child</b> E is the first child of its parent</li>
    <li> <b>E:last-child</b> E is the last child of its parent</li>
    <li> <b>E:nth-child(<i>n</i>)</b> E is the <i>n</i>th child of its parent (1 based as per the spec)</li>
    <li> <b>E:nth-child(odd)</b> E is an odd child of its parent</li>
    <li> <b>E:nth-child(even)</b> E is an even child of its parent</li>
    <li> <b>E:only-child</b> E is the only child of its parent</li>
    <li> <b>E:checked</b> E is an element that is has a checked attribute that is true (e.g. a radio or checkbox) </li>
    <li> <b>E:first</b> the first E in the resultset</li>
    <li> <b>E:last</b> the last E in the resultset</li>
    <li> <b>E:nth(<i>n</i>)</b> the <i>n</i>th E in the resultset (1 based)</li>
    <li> <b>E:odd</b> shortcut for :nth-child(odd)</li>
    <li> <b>E:even</b> shortcut for :nth-child(even)</li>
    <li> <b>E:contains(foo)</b> E's innerHTML contains the substring "foo"</li>
    <li> <b>E:nodeValue(foo)</b> E contains a textNode with a nodeValue that equals "foo"</li>
    <li> <b>E:not(S)</b> an E element that does not match simple selector S</li>
    <li> <b>E:has(S)</b> an E element that has a descendent that matches simple selector S</li>
    <li> <b>E:next(S)</b> an E element whose next sibling matches simple selector S</li>
    <li> <b>E:prev(S)</b> an E element whose previous sibling matches simple selector S</li>
    <li> <b>E:any(S1|S2|S2)</b> an E element which matches any of the simple selectors S1, S2 or S3//\\</li>
</ul>
<h4>CSS Value Selectors:</h4>
<ul class="list">
    <li> <b>E{display=none}</b> css value "display" that equals "none"</li>
    <li> <b>E{display^=none}</b> css value "display" that starts with "none"</li>
    <li> <b>E{display$=none}</b> css value "display" that ends with "none"</li>
    <li> <b>E{display*=none}</b> css value "display" that contains the substring "none"</li>
    <li> <b>E{display%=2}</b> css value "display" that is evenly divisible by 2</li>
    <li> <b>E{display!=none}</b> css value "display" that does not equal "none"</li>
</ul>
 * @singleton
 */
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/,
    	// 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;
    
    // 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){
        if(!cls){
            return nodeSet;
        }
        var result = [], ri = -1;
        for(var 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;
        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(var i = 0, ni; ni = ns[i]; i++){
                cs = ni.getElementsByTagName(tagName);
                for(var 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 == ">"){
            var utag = tagName.toUpperCase();
            for(var i = 0, ni, cn; ni = ns[i]; i++){
                cn = ni.childNodes;
                for(var 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 == "+"){
            var utag = tagName.toUpperCase();
            for(var 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 == "~"){
            var utag = tagName.toUpperCase();
            for(var 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;
        tagName = tagName.toLowerCase();
        for(var i = 0, ci; ci = cs[i]; i++){
            if(ci.nodeType == 1 && ci.tagName.toLowerCase() == tagName){
                result[++ri] = ci;
            }
        }
        return result;
    }

    function byId(cs, id){
        if(cs.tagName || cs == document){
            cs = [cs];
        }
        if(!id){
            return cs;
        }
        var result = [], ri = -1;
        for(var 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,	    
            innerHTML;
        for(var i = 0, ci; ci = cs[i]; i++){
	    // skip non-element nodes.
            if(ci.nodeType != 1){
                continue;
            }
	    
            innerHTML = ci.innerHTML;
            // we only need to change the property names if we're dealing with html nodes, not XML
            if(innerHTML !== null && innerHTML !== undefined){
                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){
        return Ext.DomQuery.pseudos[name](cs, value);
    }

    function nodupIEXml(cs){
        var d = ++key, 
            r;
        cs[0].setAttribute("_nodup", d);
        r = [cs[0]];
        for(var i = 1, len = cs.length; i < len; i++){
            var c = cs[i];
            if(!c.getAttribute("_nodup") != d){
                c.setAttribute("_nodup", d);
                r[r.length] = c;
            }
        }
        for(var 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;
        if(!len || typeof cs.nodeType != "undefined" || len == 1){
            return cs;
        }
        if(isIE && typeof cs[0].selectSingleNode != "undefined"){
            return nodupIEXml(cs);
        }
        var d = ++key;
        cs[0]._nodup = d;
        for(i = 1; c = cs[i]; i++){
            if(c._nodup != d){
                c._nodup = d;
            }else{
                r = [];
                for(var 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 = [];
        for(var i = 0, len = c1.length; i < len; i++){
            c1[i].setAttribute("_qdiff", d);
        }        
        for(var i = 0, len = c2.length; i < len; i++){
            if(c2[i].getAttribute("_qdiff") != d){
                r[r.length] = c2[i];
            }
        }
        for(var 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 = [];
        if(!len1){
            return c2;
        }
        if(isIE && typeof c1[0].selectSingleNode != "undefined"){
            return quickDiffIEXml(c1, c2);
        }        
        for(var i = 0; i < len1; i++){
            c1[i]._qdiff = d;
        }        
        for(var 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){
           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 (optional) Either "select" (the default) 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);
            
            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;
                var 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))){
                    var matched = false;
                    for(var j = 0; j < matchersLn; j++){
                        var t = matchers[j];
                        var 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){
                        throw '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 a group of elements.
         * @param {String} selector The selector/xpath query (can be a comma separated list of selectors)
         * @param {Node/String} root (optional) The start of the query (defaults to document).
         * @return {Array} 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 = [];
		
	    // loop over each selector
            for(var i = 0, len = paths.length; i < len; i++){		
                var subPath = paths[i].replace(trimRe, "");
		// compile and place in cache
                if(!cache[subPath]){
                    cache[subPath] = Ext.DomQuery.compile(subPath);
                    if(!cache[subPath]){
                        throw subPath + " is not a valid selector";
                    }
                }
                var 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;
	},
        select : document.querySelectorAll ? function(path, root, type) {
	    root = root || document;
	    if (!Ext.DomQuery.isXml(root)) {
		try {
		    var cs = root.querySelectorAll(path);
		    return Ext.toArray(cs);
		}
		catch (ex) {}		
	    }	    
	    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 {Node} root (optional) The start of the query (defaults to document).
         * @return {Element} 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 {Node} root (optional) The start of the query (defaults to document).
         * @param {String} defaultValue
         * @return {String}
         */
        selectValue : function(path, root, defaultValue){
            path = path.replace(trimRe, "");
            if(!valueCache[path]){
                valueCache[path] = Ext.DomQuery.compile(path, "select");
            }
            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 {Node} root (optional) The start of the query (defaults to document).
         * @param {Number} defaultValue
         * @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/Array} 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 {Array} 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 {Array} 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");
            }
            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 =, !=, ^=, $=, *=, %=, |= and ~=.
         * New operators can be added as long as the match the format <i>c</i>= where <i>c</i> is any character other than space, &gt; &lt;.
         */
        operators : {
            "=" : function(a, v){
                return a == v;
            },
            "!=" : function(a, v){
                return a != v;
            },
            "^=" : function(a, v){
                return a && a.substr(0, v.length) == v;
            },
            "$=" : 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;
            }
        },

        /**
         * <p>Object hash of "pseudo class" filter functions which are used when filtering selections. Each function is passed
         * two parameters:</p><div class="mdetail-params"><ul>
         * <li><b>c</b> : Array<div class="sub-desc">An Array of DOM elements to filter.</div></li>
         * <li><b>v</b> : String<div class="sub-desc">The argument (if any) supplied in the selector.</div></li>
         * </ul></div>
         * <p>A filter function returns an Array of DOM elements which conform to the pseudo class.</p>
         * <p>In addition to the provided pseudo classes listed above such as <code>first-child</code> and <code>nth-child</code>,
         * developers may add additional, custom psuedo class filters to select elements according to application-specific requirements.</p>
         * <p>For example, to filter <code>&lt;a></code> elements to only return links to <i>external</i> resources:</p>
         * <code><pre>
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;
};</pre></code>
         * Then external links could be gathered with the following statement:<code><pre>
var externalLinks = Ext.select("a:external");
</code></pre>
         */
        pseudos : {
            "first-child" : function(c){
                var r = [], ri = -1, n;
                for(var i = 0, ci; 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;
                for(var i = 0, ci; 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;
                for(var i = 0, n; n = c[i]; i++){
                    var pn = n.parentNode;
                    if (batch != pn._batch) {
                        var j = 0;
                        for(var 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;;
                for(var i = 0, ci; ci = c[i]; i++){
                    if(!prev(ci) && !next(ci)){
                        r[++ri] = ci;
                    }
                }
                return r;
            },

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

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

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

/**
 * Selects an array of DOM nodes by CSS/XPath selector. Shorthand of {@link Ext.DomQuery#select}
 * @param {String} path The selector/xpath query
 * @param {Node} root (optional) The start of the query (defaults to document).
 * @return {Array}
 * @member Ext
 * @method query
 */
Ext.query = Ext.DomQuery.select;