query.js

//=========================================
// 选择器模块 v5 开发代号Icarus
//==========================================
define("query",["mass"], function( $ ){
    var global = this, DOC = global.document;
    $.mix({
        //http://www.cnblogs.com/rubylouvre/archive/2010/03/14/1685360.
        isXML : function(el){
            var doc = el.ownerDocument || el
            return doc.createElement("p").nodeName !== doc.createElement("P").nodeName;
        },
        // 第一个节点是否包含第二个节点
        contains:function(a, b){
            if(a.compareDocumentPosition){
                return !!(a.compareDocumentPosition(b) & 16);
            }else if(a.contains){
                return a !== b && (a.contains ? a.contains(b) : true);
            }
            while ((b = b.parentNode))
                if (a === b) return true;
            return false;
        },
        //获取某个节点的文本，如果此节点为元素节点，则取其childNodes的所有文本，
        //为了让结果在所有浏览器下一致，忽略所有空白节点，因此它非元素的innerText或textContent
        getText : function() {
            return function getText( nodes ) {
                for ( var i = 0, ret = "",node; node = nodes[i++];  ) {
                    // 对得文本节点与CDATA的内容
                    if ( node.nodeType === 3 || node.nodeType === 4 ) {
                        ret += node.nodeValue;
                    //取得元素节点的内容
                    } else if ( node.nodeType !== 8 ) {
                        ret += getText( node.childNodes );
                    }
                }
                return ret;
            }
        }(),
        unique :function(nodes){
            if(nodes.length < 2){
                return nodes;
            }
            var result = [], array = [], uniqResult = {}, node = nodes[0],index, ri = 0
            //如果支持sourceIndex我们将使用更为高效的节点排序
            //http://www.cnblogs.com/jkisjk/archive/2011/01/28/array_quickly_sortby.html
            if(node.sourceIndex){//IE opera
                for(var i = 0 , n = nodes.length; i< n; i++){
                    node = nodes[i];
                    index = node.sourceIndex+1e8;
                    if(!uniqResult[index]){
                        (array[ri++] = new String(index))._ = node;
                        uniqResult[index] = 1
                    }
                }
                array.sort();
                while( ri )
                    result[--ri] = array[ri]._;
                return result;
            }else {
                var sortOrder = node.compareDocumentPosition ? sortOrder1 : sortOrder2;
                nodes.sort( sortOrder );
                if (sortOrder.hasDuplicate ) {
                    for ( i = 1; i < nodes.length; i++ ) {
                        if ( nodes[i] === nodes[ i - 1 ] ) {
                            nodes.splice( i--, 1 );
                        }
                    }
                }
                sortOrder.hasDuplicate = false;
                return nodes;
            }
        }
    });
    var reg_combinator  = /^\s*([>+~,\s])\s*(\*|(?:[-\w*]|[^\x00-\xa0]|\\.)*)/
    var trimLeft = /^\s+/;
    var trimRight = /\s+$/;
    var reg_quick = /^(^|[#.])((?:[-\w]|[^\x00-\xa0]|\\.)+)$/;
    var reg_comma       = /^\s*,\s*/;
    var reg_sequence = /^([#\.:]|\[\s*)((?:[-\w]|[^\x00-\xa0]|\\.)+)/;
    var reg_pseudo        = /^\(\s*("([^"]*)"|'([^']*)'|[^\(\)]*(\([^\(\)]*\))?)\s*\)/;
    var reg_attrib      = /^\s*(?:(\S?=)\s*(?:(['"])(.*?)\2|(#?(?:[\w\u00c0-\uFFFF\-]|\\.)*)|)|)\s*\]/
    var reg_attrval  = /\\([0-9a-fA-F]{2,2})/g;
    var reg_sensitive       = /^(title|id|name|class|for|href|src)$/
    var reg_backslash = /\\/g;
    var reg_tag  = /^((?:[-\w\*]|[^\x00-\xa0]|\\.)+)/;//能使用getElementsByTagName处理的CSS表达式
    if ( trimLeft.test( "\xA0" ) ) {
        trimLeft = /^[\s\xA0]+/;
        trimRight = /[\s\xA0]+$/;
    }

    var hash_operator   = {
        "=": 1, 
        "!=": 2, 
        "|=": 3,
        "~=": 4, 
        "^=": 5, 
        "$=": 6, 
        "*=": 7
    }

    function sortOrder1( a, b ) {
        if ( a === b ) {
            sortOrder1.hasDuplicate = true;
            return 0;
        }
        if ( !a.compareDocumentPosition || !b.compareDocumentPosition ) {
            return a.compareDocumentPosition ? -1 : 1;
        }
        return a.compareDocumentPosition(b) & 4 ? -1 : 1;
    };

    function sortOrder2( a, b ) {//处理旧式的标准浏览器与XML
        if ( a === b ) {
            sortOrder2.hasDuplicate = true;
            return 0;
        }
        var al, bl,
        ap = [],
        bp = [],
        aup = a.parentNode,
        bup = b.parentNode,
        cur = aup;
        //如果是属于同一个父节点，那么就比较它们在childNodes中的位置
        if ( aup === bup ) {
            return siblingCheck( a, b );
        // If no parents were found then the nodes are disconnected
        } else if ( !aup ) {
            return -1;

        } else if ( !bup ) {
            return 1;
        }
        // Otherwise they're somewhere else in the tree so we need
        // to build up a full list of the parentNodes for comparison
        while ( cur ) {
            ap.unshift( cur );
            cur = cur.parentNode;
        }

        cur = bup;

        while ( cur ) {
            bp.unshift( cur );
            cur = cur.parentNode;
        }

        al = ap.length;
        bl = bp.length;

        // Start walking down the tree looking for a discrepancy
        for ( var i = 0; i < al && i < bl; i++ ) {
            if ( ap[i] !== bp[i] ) {
                return siblingCheck( ap[i], bp[i] );
            }
        }
        // We ended someplace up the tree so do a sibling check
        return i === al ?
        siblingCheck( a, bp[i], -1 ) :
        siblingCheck( ap[i], b, 1 );
    };
    function siblingCheck( a, b, ret ) {
        if ( a === b ) {
            return ret;
        }
        var cur = a.nextSibling;

        while ( cur ) {
            if ( cur === b ) {
                return -1;
            }
            cur = cur.nextSibling;
        }
        return 1;
    };
    var slice = Array.prototype.slice,
    makeArray = function ( nodes, result, flag_multi ) {  
        nodes = slice.call( nodes, 0 );
        if ( result ) {
            result.push.apply( result, nodes );
        }else{
            result = nodes;
        }
        return  flag_multi ? $.unique(result) : result;
    };
    //IE56789无法使用数组方法转换节点集合
    try {
        slice.call( $.html.childNodes, 0 )[0].nodeType;
    } catch( e ) {
        makeArray = function ( nodes, result ,flag_multi) {
            var ret = result || [], ri = ret.length;
            for(var i = 0,el ; el = nodes[i++];){
                ret[ri++] = el
            }
            return flag_multi ? $.unique(ret) : ret;
        }
    }
    function _toHex(x, y) {
        return String.fromCharCode(parseInt(y, 16));
    }
    function parse_nth(expr) {
        var orig = expr
        expr = expr.replace(/^\+|\s*/g, '');//清除无用的空白
        var match = (expr === "even" && "2n" || expr === "odd" && "2n+1" || !/\D/.test(expr) && "0n+" + expr || expr).match(/(-?)(\d*)n([-+]?\d*)/);
        return parse_nth[ orig ] = {
            a: (match[1] + (match[2] || 1)) - 0, 
            b: match[3] - 0
        };
    }
    function getElementsByTagName(tagName, els, flag_xml) {
        var method = "getElementsByTagName", elems = [], uniqResult = {}, prefix
        if(flag_xml && tagName.indexOf(":") > 0 && els.length && els[0].lookupNamespaceURI){
            var arr = tagName.split(":");
            prefix = arr[0];
            tagName = arr[1];
            method = "getElementsByTagNameNS";
            prefix = els[0].lookupNamespaceURI(prefix);
        }
        switch (els.length) {
            case 0:
                return elems;
            case 1:
                //在IE67下，如果存在一个name为length的input元素，下面的all.length返回此元素，而不是长度值
                var all =  prefix ? els[0][method](prefix,tagName) : els[0][method](tagName);
                for(var i = 0, ri = 0, el; el = all[i++];){
                    if(el.nodeType === 1){//防止混入注释节点
                        elems[ri++] = el
                    }
                }
                return elems;
            default:
                for(i = 0, ri = 0; el = els[i++];){
                    var nodes = prefix ? el[method](prefix,tagName) : el[method](tagName)
                    for (var j = 0, node; node = nodes[j++];) {
                        var uid = $.getUid(node);
                           
                        if (!uniqResult[uid]) {
                            uniqResult[uid] = elems[ri++] = node;
                        }
                    }
                }
                return elems;
        }
    }
    //IE9 以下的XML文档不能直接设置自定义属性
    var attrURL = $.oneObject('action,cite,codebase,data,href,longdesc,lowsrc,src,usemap', 2);
    var bools = $["@bools"] = "autofocus,autoplay,async,checked,controls,declare,disabled,defer,defaultChecked,"+
    "contentEditable,ismap,loop,multiple,noshade,open,noresize,readOnly,selected"
    var boolOne = $.oneObject(bools.toLowerCase() );
        
    //检测各种BUG（fixGetAttribute，fixHasAttribute，fixById，fixByTag）
    var fixGetAttribute,fixHasAttribute,fixById,fixByTag;
    var getHTMLText = new Function("els","return els[0]."+ ($.html.textContent ? "textContent" : "innerText") );

    new function(){
        var select = DOC.createElement("select");
        var option = select.appendChild( DOC.createElement("option") );
        option.setAttribute("selected","selected")
        option.className ="x"
        fixGetAttribute = option.getAttribute("class") != "x";
        select.appendChild( DOC.createComment("") );
        fixByTag = select.getElementsByTagName("*").length == 2
        var all = DOC.getElementsByTagName("*"), node, nodeType, comments = [], i = 0, j = 0;
        while ( (node = all[i++]) ) {  
            nodeType = node.nodeType;
            nodeType === 1 ? $.getUid(node) :
            nodeType === 8 ? comments.push(node) : 0;  
        }
        while ( (node = comments[j++]) ) {   
            node.parentNode.removeChild(node);
        }
        fixHasAttribute = select.hasAttribute ? !option.hasAttribute('selected') :true;
        
        var form = DOC.createElement("div"),
        id = "fixId" + (new Date()).getTime(),
        root = $.html;
        form.innerHTML = "<a name='" + id + "'/>";
        root.insertBefore( form, root.firstChild );
        fixById = !!DOC.getElementById( id ) ;
        root.removeChild(form )
    };

    //http://www.atmarkit.co.jp/fxml/tanpatsu/24bohem/01.html
    //http://msdn.microsoft.com/zh-CN/library/ms256086.aspx
    //https://developer.mozilla.org/cn/DOM/document.evaluate
    //http://d.hatena.ne.jp/javascripter/20080425/1209094795
    function getElementsByXPath(xpath,context,doc) {
        var result = [];
        try{
            if(global.DOMParser){//IE9支持DOMParser，但我们不能使用doc.evaluate!global.DOMParser
                var nodes = doc.evaluate(xpath, context, null, 7, null);
                for (var i = 0, n = nodes.snapshotLength; i < n; i++){
                    result[i] =  nodes.snapshotItem(i)
                } 
            }else{
                nodes = context.selectNodes(xpath);
                for (i = 0, n = nodes.length; i < n; i++){
                    result[i] =  nodes[i]
                } 
            }
        }catch(e){
            return false;
        }
        return result;
    };
    /**
         * 选择器
         * @param {String} expr CSS表达式
         * @param {Node}   context 上下文（可选）
         * @param {Array}  result  结果集(内部使用)
         * @param {Array}  lastResult  上次的结果集(内部使用)
         * @param {Boolean}flag_xml 是否为XML文档(内部使用)
         * @param {Boolean}flag_multi 是否出现并联选择器(内部使用)
         * @param {Boolean}flag_dirty 是否出现通配符选择器(内部使用)
         * @return {Array} result
         */
    //http://webbugtrack.blogspot.com/
    var Icarus = $.query = function(expr, contexts, result, lastResult, flag_xml,flag_multi,flag_dirty){
        result = result || [];
        contexts = contexts || DOC;
        var pushResult = makeArray;
        if(!contexts.nodeType){//实现对多上下文的支持
            contexts = pushResult(contexts);
            if(!contexts.length)
                return result
        }else{
            contexts = [contexts];
        }
        var rrelative = reg_combinator,//保存到本地作用域
        rquick = reg_quick,
        rBackslash = reg_backslash, rcomma = reg_comma,//用于切割并联选择器
        context = contexts[0],
        doc = context.ownerDocument || context,
        rtag = reg_tag,
        flag_all, uniqResult, elems, nodes, tagName, last, ri, uid;
        //将这次得到的结果集放到最终结果集中
        //如果要从多个上下文中过滤孩子
        expr = expr.replace(trimLeft, "").replace(trimRight, "");  
        flag_xml = flag_xml !== void 0 ? flag_xml : $.isXML(doc);
        if ( flag_xml && expr === "body" && context.body )
            return pushResult( [context.body], result, flag_multi );
        if (!flag_xml && doc.querySelectorAll) {
            var query = expr;
            if(contexts.length > 2 || doc.documentMode == 8  && context.nodeType == 1  ){
                if(contexts.length > 2 )
                    context = doc;
                query = ".fix_icarus_sqa "+query;//IE8也要使用类名确保查找范围
                for(var i = 0, node; node = contexts[i++];){
                    if(node.nodeType === 1){
                        node.className = "fix_icarus_sqa " + node.className;
                    }
                }
            }
            if(doc.documentMode !== 8  || context.nodeName.toLowerCase() !== "object"){
                try{
                    return pushResult( context.querySelectorAll(query), result, flag_multi);
                }catch(e){
                }finally{
                    if(query.indexOf(".fix_icarus_sqa") === 0 ){//如果为上下文添加了类名，就要去掉类名
                        for(i = 0; node = contexts[i++];){
                            if(node.nodeType === 1){
                                node.className =  node.className.replace("fix_icarus_sqa ","");
                            }
                        }
                    }
                }
            }
        }
        var match = expr.match(rquick);
        if(match ){//对只有单个标签，类名或ID的选择器进行提速
            var value = match[2].replace(rBackslash,""), key = match[1];
            if (  key == "") {//tagName;
                nodes = getElementsByTagName(value,contexts,flag_xml);
            } else if ( key === "." && contexts.length === 1 ) {//className，并且上下文只有1个
                if(flag_xml){//如果XPATH查找失败，就会返回字符，那些我们就使用普通方式去查找
                    nodes = getElementsByXPath("//*[@class='"+value+"']", context, doc);
                }else if(context.getElementsByClassName){
                    nodes = context.getElementsByClassName( value );
                }
            }else if ( key === "#" && contexts.length === 1){//ID，并且上下文只有1个
                if( flag_xml){
                    nodes = getElementsByXPath("//*[@id='"+value+"']", context, doc);
                //基于document的查找是不安全的，因为生成的节点可能还没有加入DOM树，比如$("<div id=\"A'B~C.D[E]\"><p>foo</p></div>").find("p")
                }else if(context.nodeType == 9){
                    node = doc.getElementById(value);
                    //IE67 opera混淆表单元素，object以及链接的ID与NAME
                    //http://webbugtrack.blogspot.com/2007/08/bug-152-getelementbyid-returns.html
                    nodes = !node ? [] : !fixById ? [node] : node.getAttributeNode("id").nodeValue === value ? [node] : false;
                }
            }
            if(nodes ){
                return pushResult( nodes, result, flag_multi );
            }
        }
        //执行效率应该是内大外小更高一写
        lastResult = contexts;
        if(lastResult.length){
            loop:
            while (expr && last !== expr) {
                flag_dirty = false;
                elems = null;
                uniqResult = {};
                //处理夹在中间的关系选择器（取得连接符及其后的标签选择器或通配符选择器）
                if (match = expr.match(rrelative)) {
                    expr = RegExp.rightContext;
                    elems = [];
                    tagName = (flag_xml ? match[2] : match[2].toUpperCase()).replace(rBackslash,"") || "*";
                    i = 0;
                    ri = 0;
                    flag_all = tagName === "*";// 表示无需判定tagName
                    switch (match[1]) {//根据连接符取得种子集的亲戚，组成新的种子集
                        case " "://后代选择器
                            if(expr.length || match[2]){//如果后面还跟着东西或最后的字符是通配符
                                elems = getElementsByTagName(tagName, lastResult, flag_xml);
                            }else{
                                elems = lastResult;
                                break loop
                            }
                            break;
                        case ">"://亲子选择器
                            while((node = lastResult[i++])){
                                for (node = node.firstChild; node; node = node.nextSibling){
                                    if (node.nodeType === 1 && (flag_all || tagName === node.nodeName)){
                                        elems[ri++] = node;
                                    }
                                }
                            }
                            break;
                        case "+"://相邻选择器
                            while((node = lastResult[i++])){
                                while((node = node.nextSibling)){
                                    if (node.nodeType === 1) {
                                        if (flag_all || tagName === node.nodeName)
                                            elems[ri++] = node;
                                        break;
                                    }
                                }
                            }
                            break;
                        case "~"://兄长选择器
                            while((node = lastResult[i++])){
                                while((node = node.nextSibling)){
                                    if (node.nodeType === 1 && (flag_all || tagName === node.nodeName)) {
                                        uid = $.getUid(node);
                                        if (uniqResult[uid]){
                                            break;
                                        }else {
                                            uniqResult[uid] = elems[ri++] = node;
                                        }
                                    }
                                }
                            }
                            elems = $.unique(elems);
                            break;
                    }
                }else if(match = expr.match(rtag)){//处理位于最开始的或并联选择器之后的标签选择器或通配符
                    expr = RegExp.rightContext;
                    elems = getElementsByTagName(match[1].replace(rBackslash,""), lastResult, flag_xml);
                }
                   
                if(expr){
                    var arr = Icarus.filter(expr, elems, lastResult, doc, flag_xml);
                    expr = arr[0];
                    elems = arr[1];
                    if (!elems) {
                        flag_dirty = true;
                        elems = getElementsByTagName("*", lastResult, flag_xml);
                    }
                    if (match = expr.match(rcomma)) {
                        expr = RegExp.rightContext;
                        pushResult(elems, result);
                        return Icarus(expr, contexts, result, [], flag_xml, true, flag_dirty);
                    }else{
                        lastResult = elems;
                    }
                }
                    
            }
        }
        if (flag_multi) {
            if (elems.length){
                return pushResult(elems, result,flag_multi);
            }
        }else if (DOC !== doc || fixByTag && flag_dirty) {
            for (result = [], ri = 0, i = 0; node = elems[i++]; )
                if (node.nodeType === 1)
                    result[ri++] = node;
            return result
        }
        return elems;
    }
    var onePosition = $.oneObject("eq,gt,lt,first,last,even,odd");

    $.mix(Icarus, {
        //getAttribute总会返回字符串
        //http://reference.sitepoint.com/javascript/Element/getAttribute
        getAttribute : !fixGetAttribute ?
        function(elem, name) {
            return elem.getAttribute(name) || '';
        } :
        function(elem, name, flag_xml) {
            if(flag_xml)
                return elem.getAttribute(name) || '';
            name = name.toLowerCase();
            //http://jsfox.cn/blog/javascript/get-right-href-attribute.html
            if(attrURL[name]){//得到href属性里原始链接，不自动转绝对地址、汉字和符号都不编码
                return  elem.getAttribute(name, 2) || ''
            }
            if(name === "style"){
                return elem.style.cssText.toLowerCase();
            }
            if(elem.tagName === "INPUT" && name == "type"){
                return elem.getAttribute("type") || elem.type;//IE67无法辩识HTML5添加添加的input类型，如input[type=search]，不能使用el.type与el.getAttributeNode去取。
            }
            //布尔属性，如果为true时则返回其属性名，否则返回空字符串，其他一律使用getAttributeNode
            var attr = boolOne[name] ? (elem.getAttribute(name) ? name : '') :
            (elem = elem.getAttributeNode(name)) && elem.value || '';
            return reg_sensitive.test(name)? attr :attr.toLowerCase();
        },
        hasAttribute : !fixHasAttribute ?
        function(elem, name, flag_xml) {
            return flag_xml ?  !!elem.getAttribute(name) :elem.hasAttribute(name);
        } :
        function(elem, name) {
            //http://help.dottoro.com/ljnqsrfe.php
            name = name.toLowerCase();
            //如果这个显式设置的属性是""，即使是outerHTML也寻不见其踪影
            elem = elem.getAttributeNode(name);
            return !!(elem && (elem.specified || elem.nodeValue));
        },
        filter : function(expr, elems, lastResult, doc, flag_xml, flag_get){
            var rsequence = reg_sequence,
            rattrib = reg_attrib ,
            rpseudo = reg_pseudo,
            rBackslash = reg_backslash,
            rattrval  = reg_attrval,
            pushResult = makeArray,
            toHex = _toHex,
            _hash_op  = hash_operator,
            parseNth = parse_nth,
            match ,key, tmp;
            while ( match = expr.match(rsequence)) {//主循环
                expr = RegExp.rightContext;     
                key = ( match[2]|| "").replace(rBackslash,"");
                if (!elems) {//取得用于过滤的元素
                    if (lastResult.length === 1 && lastResult[0] === doc){
                        switch (match[1]) {
                            case "#":
                                if (!flag_xml) {//FF chrome opera等XML文档中也存在getElementById，但不能用
                                    tmp = doc.getElementById(key);
                                    if (!tmp) {
                                        elems = [];
                                        continue;
                                    }
                                    //处理拥有name值为"id"的控件的form元素
                                    if (fixById ? tmp.id === key : tmp.getAttributeNode("id").nodeValue === key) {
                                        elems = [tmp];
                                        continue;
                                    }
                                }
                                break;
                            case ":":
                                switch (key) {
                                    case "root":
                                        elems = [doc.documentElement];
                                        continue;
                                    case "link":
                                        elems = pushResult(doc.links || []);
                                        continue;
                                }
                                break;
                        }
                    }
                    elems = getElementsByTagName("*", lastResult, flag_xml);//取得过滤元
                }
                //取得用于过滤的函数，函数参数或数组
                var filter = 0, flag_not = false, args; 
                switch (match[1]) {
                    case "#"://ID选择器
                        filter = ["id", "=", key];
                        break;
                    case "."://类选择器
                        filter = ["class", "~=", key];
                        break;
                    case ":"://伪类选择器
                        tmp = Icarus.pseudoHooks[key];
                        if (match = expr.match(rpseudo)) {
                            expr = RegExp.rightContext;
                            if(!!~key.indexOf("nth")){
                                args = parseNth[match[1]] || parseNth(match[1]);
                            }else{
                                args = match[3] || match[2] || match[1]
                            }
                        }
                        if (tmp){
                            filter = tmp;
                        }else if (key === "not") {
                            flag_not = true;
                            if (args === "*"){//处理反选伪类中的通配符选择器
                                elems = [];
                            }else if(reg_tag.test(args)){//处理反选伪类中的标签选择器
                                tmp = [];
                                match = flag_xml ? args : args.toUpperCase();
                                for (var i = 0, ri = 0, elem; elem = elems[i++];)
                                    if (match !== elem.nodeName)
                                        tmp[ri++] = elem;
                                elems = tmp;
                            }else{
                                var obj =  Icarus.filter(args, elems, lastResult, doc, flag_xml, true) ;
                                filter = obj.filter;
                                args   = obj.args;
                            }
                        }
                        else{
                            throw 'An invalid or illegal string was specified : "'+ key+'"!'
                        }
                        break
                    default:
                        filter = [key.toLowerCase()];  
                        if ((match = expr.match(rattrib))) {
                            expr = RegExp.rightContext;
                            if (match[1]) {
                                filter[1] = match[1];//op
                                filter[2] = match[3] || match[4];//对值进行转义
                                filter[2] = filter[2] ? filter[2].replace(rattrval, toHex).replace(rBackslash,"") : "";
                            }
                        }
                        break;
                }
                if(flag_get){
                    return {
                        filter:filter,
                        args:args
                    }
                }
                //如果条件都俱备，就开始进行筛选 
                if (elems.length && filter) {
                    tmp = [];
                    i = 0;
                    ri = 0;
                    if (typeof filter === "function") {//如果是一些简单的伪类
                        if(onePosition[key]){
                            //如果args为void则将集合的最大索引值传进去，否则将exp转换为数字
                            args =  args === void 0 ? elems.length - 1 : ~~args;
                            for (; elem = elems[i];){
                                if(filter(i++, args) ^ flag_not)
                                    tmp[ri++] = elem;
                            }
                        }else{
                            while((elem = elems[i++])){
                                if ((!!filter(elem, args)) ^ flag_not)
                                    tmp[ri++] = elem;
                            }
                        }
                    }else if (typeof filter.exec === "function"){//如果是子元素过滤伪类
                        tmp = filter.exec({
                            not: flag_not, 
                            xml: flag_xml
                        }, elems, args, doc);
                    } else {
                        var name = filter[0], op = _hash_op[filter[1]], val = filter[2]||"", flag, attr;
                        if (!flag_xml && name === "class" && op === 4) {//如果是类名
                            val = " " + val + " ";
                            while((elem = elems[i++])){
                                var className = elem.className;
                                if (!!(className && (" " + className + " ").indexOf(val) > -1) ^ flag_not){
                                    tmp[ri++] = elem;
                                }
                            }
                        } else {
                            if(!flag_xml && op && val && !reg_sensitive.test(name)){
                                val = val.toLowerCase();
                            }
                            if (op === 4){
                                val = " " + val + " ";
                            }
                            while((elem = elems[i++])){
                                if(!op){
                                    flag = Icarus.hasAttribute(elem,name,flag_xml);//[title]
                                }else if(val === "" && op > 3){
                                    flag = false
                                }else{
                                    attr = Icarus.getAttribute(elem,name,flag_xml);
                                    switch (op) {
                                        case 1:// = 属性值全等于给出值
                                            flag = attr === val;
                                            break;
                                        case 2://!= 非标准，属性值不等于给出值
                                            flag = attr !== val;
                                            break;
                                        case 3://|= 属性值以“-”分割成两部分，给出值等于其中一部分，或全等于属性值
                                            flag = attr === val || attr.substr(0, val.length + 1) === val + "-";
                                            break;
                                        case 4://~= 属性值为多个单词，给出值为其中一个。
                                            flag = attr && (" " + attr + " ").indexOf(val) >= 0;
                                            break;
                                        case 5://^= 属性值以给出值开头
                                            flag = attr  && attr.indexOf(val) === 0 ;
                                            break;
                                        case 6://$= 属性值以给出值结尾
                                            flag = attr  && attr.substr(attr.length - val.length) === val;
                                            break;
                                        case 7://*= 属性值包含给出值
                                            flag = attr  && attr.indexOf(val) >= 0;
                                            break;
                                    }
                                }
                                if (flag ^ flag_not)
                                    tmp[ri++] = elem;
                            }
                        }
                    }
                    elems = tmp;
                }
            }
            return [expr, elems];
        }
    });

    //===================构建处理伪类的适配器=====================
    var filterPseudoHasExp = function(strchild,strsibling, type){
        return {
            exec:function(flags,lastResult,args){
                var result = [], flag_not = flags.not,child = strchild, sibling = strsibling,
                ofType = type, cache = {},lock = {},a = args.a, b = args.b, i = 0, ri = 0, el, found ,diff,count;
                if(!ofType && a === 1 && b === 0 ){
                    return flag_not ? [] : lastResult;
                }
                var checkName = ofType ? "nodeName" : "nodeType";
                for (; el = lastResult[i++];) {
                    var parent = el.parentNode;
                    var pid =  $.getUid(parent);
                    if (!lock[pid]){
                        count = lock[pid] = 1;
                        var checkValue = ofType ? el.nodeName : 1;
                        for(var node = parent[child];node;node = node[sibling]){
                            if(node[checkName] === checkValue){
                                pid = $.getUid(node);
                                cache[pid] = count++;
                            }
                        }
                    }
                    diff = cache[$.getUid(el)] - b;
                    found =  a === 0 ? diff === 0 : (diff % a === 0 && diff / a >= 0 );
                    (found ^ flag_not) && (result[ri++] = el);
                }
                return  result;
            }
        };
    };
    function filterPseudoNoExp(name, isLast, isOnly) {
        var A = "var result = [], flag_not = flags.not, node, el, tagName, i = 0, ri = 0, found = 0; for (; node = el = lastResult[i++];found = 0) {"
        var B = "{0} while (!found && (node=node.{1})) { (node.{2} === {3})  && ++found;  }";
        var C = " node = el;while (!found && (node = node.previousSibling)) {  node.{2} === {3} && ++found;  }";
        var D =  "!found ^ flag_not && (result[ri++] = el);  }   return result";

        var start = isLast ? "nextSibling" : "previousSibling";
        var fills = {
            type: [" tagName = el.nodeName;", start, "nodeName", "tagName"],
            child: ["", start, "nodeType", "1"]
        }
        [name];
        var body = A+B+(isOnly ? C: "")+D;
        var fn = new Function("flags","lastResult",body.replace(/{(\d)}/g, function ($, $1) {
            return fills[$1];
        }));
        return {
            exec:fn
        }
    }

    function filterProp(str_prop, flag) {
        return {
            exec: function (flags, elems) {
                var result = [], prop = str_prop, flag_not = flag ? flags.not : !flags.not;
                for (var i = 0,ri = 0, elem; elem = elems[i++];)
                    if ( elem[prop] ^ flag_not)
                        result[ri++] = elem;//&& ( !flag || elem.type !== "hidden" )
                return result;
            }
        };
    };
    Icarus.pseudoHooks = {
        root: function (el) {//标准
            return el === (el.ownerDocument || el.document).documentElement;
        },
        target: {//标准
            exec: function (flags, elems,_,doc) {
                var result = [], flag_not = flags.not;
                var win = doc.defaultView || doc.parentWindow;
                var hash = win.location.hash.slice(1);       
                for (var i = 0,ri = 0, elem; elem = elems[i++];)
                    if (((elem.id || elem.name) === hash) ^ flag_not)
                        result[ri++] = elem;
                return result;
            }
        },
        "first-child"    : filterPseudoNoExp("child", false, false),
        "last-child"     : filterPseudoNoExp("child", true,  false),
        "only-child"     : filterPseudoNoExp("child", true,  true),
        "first-of-type"  : filterPseudoNoExp("type",  false, false),
        "last-of-type"   : filterPseudoNoExp("type",  true,  false),
        "only-of-type"   : filterPseudoNoExp("type",  true,  true),//name, isLast, isOnly
        "nth-child"       : filterPseudoHasExp("firstChild", "nextSibling",     false),//标准
        "nth-last-child"  : filterPseudoHasExp("lastChild",  "previousSibling", false),//标准
        "nth-of-type"     : filterPseudoHasExp("firstChild", "nextSibling",     true),//标准
        "nth-last-of-type": filterPseudoHasExp("lastChild",  "previousSibling", true),//标准
        empty: {//标准
            exec: function (flags, elems) {   
                var result = [], flag_not = flags.not;
                for (var i = 0, ri = 0, elem; elem = elems[i++];) {
                    if(elem.nodeType == 1){
                        if (!elem.firstChild ^ flag_not)
                            result[ri++] = elem;
                    }
                }
                return result;
            }
        },
        link: {//标准
            exec: function (flags, elems) {
                var links = (elems[0].ownerDocument || elems[0].document).links;
                if (!links) return [];
                var result = [],
                checked = {},
                flag_not = flags.not;
                for (var i = 0, ri = 0,elem; elem = links[i++];)
                    checked[$.getUid(elem) ] = 1;
                for (i = 0; elem = elems[i++]; )
                    if (checked[$.getUid(elem)] ^ flag_not)
                        result[ri++] = elem;
                return result;
            }
        },
        lang: {//标准 CSS2链接伪类
            exec: function (flags, elems, arg) {
                var result = [], reg = new RegExp("^" + arg, "i"), flag_not = flags.not;
                for (var i = 0, ri = 0, elem; elem = elems[i++]; ){
                    var tmp = elem;
                    while (tmp && !tmp.getAttribute("lang"))
                        tmp = tmp.parentNode;
                    tmp = !!(tmp && reg.test(tmp.getAttribute("lang")));
                    if (tmp ^ flag_not)
                        result[ri++] = elem;
                }
                return result;
            }
        },
        active: function(el){
            return el === el.ownerDocument.activeElement;
        },
        focus:function(el){
            return (el.type|| el.href) && el === el.ownerDocument.activeElement;
        },
        indeterminate : function(node){//标准
            return node.indeterminate === true && node.type === "checkbox"
        },
        //http://www.w3.org/TR/css3-selectors/#UIstates
        enabled:  filterProp("disabled", false),//标准
        disabled: filterProp("disabled", true),//标准
        checked:  filterProp("checked", true),//标准
        contains: {
            exec: function (flags, elems, arg) {
                var res = [], fn = flags.xml ? $.getText: getHTMLText,
                flag_not = flags.not;
                for (var i = 0, ri = 0, elem; elem = elems[i++]; ){
                    if ((!!~  fn( [elem] ).indexOf(arg)) ^ flag_not)
                        res[ri++] = elem;
                }
                return res;
            }
        },
        //自定义伪类
        selected : function(el){
            el.parentNode && el.parentNode.selectedIndex;//处理safari的bug
            return el.selected === true;
        },
        header : function(el){
            return /h\d/i.test( el.nodeName );
        },
        button : function(el){
            return "button" === el.type || el.nodeName === "BUTTON";
        },
        input: function(el){
            return /input|select|textarea|button/i.test(el.nodeName);
        },
        parent : function( el ) {
            return !!el.firstChild;
        },
        has : function(el, expr){//孩子中是否拥有匹配expr的节点
            return !!$.query(expr,[el]).length;
        },
        //与位置相关的过滤器
        first: function(index){
            return index === 0;
        },
        last: function(index, num){
            return index === num;
        },
        even: function(index){
            return index % 2 === 0;
        },
        odd: function(index){
            return index % 2 === 1;
        },
        lt: function(index, num){
            return index < num;
        },
        gt: function(index, num){
            return index > num;
        },
        eq: function(index, num){
            return index ===  num;
        },
        hidden : function( el ) {
            return el.type === "hidden" || (!el.offsetWidth && !el.offsetHeight) || (el.currentStyle && el.currentStyle.display === "none") ;
        }
    }
    Icarus.pseudoHooks.visible = function(el){
        return  !Icarus.pseudoHooks.hidden(el);
    }

    "text,radio,checkbox,file,password,submit,image,reset".replace($.rword, function(name){
        Icarus.pseudoHooks[name] = function(el){
            return (el.getAttribute("type") || el.type) === name;//避开HTML5新增类型导致的BUG，不直接使用el.type === name;
        }
    });
    return Icarus
});
/**
2011.10.25重构$.unique
2011.10.26支持对拥有name值为id的控件的表单元素的查找，添加labed语句，让元素不存在时更快跳出主循环
2011.10.30让属性选择器支持拥有多个中括号与转义符的属性表达式，如‘input[name=brackets\\[5\\]\\[\\]]’
2011.10.31重构属性选择器处理无操作部分，使用hasAttribute来判定用户是否显示使用此属性，并支持checked, selected, disabled等布尔属性
2011.10.31重构关系选择器部分，让后代选择器也出现在switch分支中
2011.11.1 重构子元素过滤伪类的两个生成函数filterPseudoHasExp filterPseudoNoExp
2011.11.2 FIX处理 -of-type家族的BUG
2011.11.3 添加getAttribute hasAttribute API
2011.11.4 属性选择器对给出值或属性值为空字符串时进行快速过滤
2011.11.5 添加getElementsByXpath 增加对XML的支持
2011.11.6 重构getElementsByTagName 支持带命名空间的tagName
2011.11.6 处理IE67与opera9在getElementById中的BUG
2011.11.7 支持多上下文,对IE678的注释节点进行清除,优化querySelectorAll的使用
2011.11.8 处理分解nth-child参数的BUG，修正IE67下getAttribute对input[type=search]的支持，重构sortOrder标准浏览器的部分
调整swich...case中属性选择器的分支，因为reg_sequence允许出现"[  "的情况，因此会匹配不到，需要改为default
修改属性选择器$=的判定，原先attr.indexOf(val) == attr.length - val.length，会导致"PWD".indexOf("bar]")也有true
2011.11.9 增加getText 重构 getElementById与过滤ID部分
2011.11.10 exec一律改为match,对parseNth的结果进行缓存
2012.5.21 对body进行优化
https://github.com/CNEYE/JReally
*/