2 Copyright (c) 2009, Yahoo! Inc. All rights reserved.
3 Code licensed under the BSD License:
4 http://developer.yahoo.net/yui/license.txt
8 YUI.add('selector-native', function(Y) {
12 * The selector-native module provides support for native querySelector
14 * @submodule selector-native
19 * Provides support for using CSS selectors to query the DOM
25 Y.namespace('Selector'); // allow native module to standalone
27 var COMPARE_DOCUMENT_POSITION = 'compareDocumentPosition',
28 OWNER_DOCUMENT = 'ownerDocument',
29 TMP_PREFIX = 'yui-tmp-',
37 _compare: ('sourceIndex' in document.documentElement) ?
38 function(nodeA, nodeB) {
39 var a = nodeA.sourceIndex,
40 b = nodeB.sourceIndex;
50 } : (document.documentElement[COMPARE_DOCUMENT_POSITION] ?
51 function(nodeA, nodeB) {
52 if (nodeA[COMPARE_DOCUMENT_POSITION](nodeB) & 4) {
58 function(nodeA, nodeB) {
59 var rangeA, rangeB, compare;
61 rangeA = nodeA[OWNER_DOCUMENT].createRange();
62 rangeA.setStart(nodeA, 0);
63 rangeB = nodeB[OWNER_DOCUMENT].createRange();
64 rangeB.setStart(nodeB, 0);
65 compare = rangeA.compareBoundaryPoints(1, rangeB); // 1 === Range.START_TO_END
72 _sort: function(nodes) {
74 nodes = Y.Array(nodes, 0, true);
76 nodes.sort(Selector._compare);
83 _deDupe: function(nodes) {
87 for (i = 0; (node = nodes[i++]);) {
89 ret[ret.length] = node;
94 for (i = 0; (node = ret[i++]);) {
96 node.removeAttribute('_found');
103 * Retrieves a set of nodes based on a given CSS selector.
106 * @param {string} selector The CSS Selector to test the node against.
107 * @param {HTMLElement} root optional An HTMLElement to start the query from. Defaults to Y.config.doc
108 * @param {Boolean} firstOnly optional Whether or not to return only the first match.
109 * @return {Array} An array of nodes that match the given selector.
112 query: function(selector, root, firstOnly, skipNative) {
113 root = root || Y.config.doc;
115 useNative = (Y.Selector.useNative && document.querySelector && !skipNative),
116 queries = [[selector, root]],
120 fn = (useNative) ? Y.Selector._nativeQuery : Y.Selector._bruteQuery;
122 if (selector && fn) {
123 // split group into seperate queries
124 if (!skipNative && // already done if skipping
125 (!useNative || root.tagName)) { // split native when element scoping is needed
126 queries = Selector._splitQueries(selector, root);
129 for (i = 0; (query = queries[i++]);) {
130 result = fn(query[0], query[1], firstOnly);
131 if (!firstOnly) { // coerce DOM Collection to Array
132 result = Y.Array(result, 0, true);
135 ret = ret.concat(result);
139 if (queries.length > 1) { // remove dupes and sort by doc order
140 ret = Selector._sort(Selector._deDupe(ret));
144 return (firstOnly) ? (ret[0] || null) : ret;
148 // allows element scoped queries to begin with combinator
149 // e.g. query('> p', document.body) === query('body > p')
150 _splitQueries: function(selector, node) {
151 var groups = selector.split(','),
157 // enforce for element scoping
159 node.id = node.id || Y.guid();
160 prefix = '#' + node.id + ' ';
163 for (i = 0, len = groups.length; i < len; ++i) {
164 selector = prefix + groups[i];
165 queries.push([selector, node]);
172 _nativeQuery: function(selector, root, one) {
174 return root['querySelector' + (one ? '' : 'All')](selector);
175 } catch(e) { // fallback to brute if available
176 return Y.Selector.query(selector, root, one, true); // redo with skipNative true
180 filter: function(nodes, selector) {
184 if (nodes && selector) {
185 for (i = 0; (node = nodes[i++]);) {
186 if (Y.Selector.test(node, selector)) {
187 ret[ret.length] = node;
196 test: function(node, selector, root) {
198 groups = selector.split(','),
202 if (node && node.tagName) { // only test HTMLElements
203 root = root || node.ownerDocument;
206 node.id = TMP_PREFIX + g_counter++;
208 for (i = 0; (group = groups[i++]);) { // TODO: off-dom test
209 group += '#' + node.id; // add ID for uniqueness
210 item = Y.Selector.query(group, root, true);
211 ret = (item === node);
222 Y.mix(Y.Selector, Selector, true);
227 }, '3.0.0' ,{requires:['dom-base']});