selector-native.js revision 63942f7c9f6be91fe24a7b40e76d436847ec9b7b
(function(Y) {
/**
* The selector-native module provides support for native querySelector
* @module dom
* @submodule selector-native
* @for Selector
*/
/**
* Provides support for using CSS selectors to query the DOM
* @class Selector
* @static
* @for Selector
*/
Y.namespace('Selector'); // allow native module to standalone
var COMPARE_DOCUMENT_POSITION = 'compareDocumentPosition',
OWNER_DOCUMENT = 'ownerDocument',
TMP_PREFIX = 'yui-tmp-',
g_counter = 0;
var Selector = {
_reLead: /^\s*([>+~]|:self)/,
_reUnSupported: /!./g,
_foundCache: [],
_supportsNative: function() {
// whitelist and feature detection to manage
// future implementations manually
return ( (Y.UA.ie >= 8 || Y.UA.webkit > 525) &&
document.querySelectorAll);
},
useNative: true,
_toArray: function(nodes) { // TODO: move to Y.Array
var ret = nodes,
i, len;
if (!nodes.slice) {
try {
ret = Array.prototype.slice.call(nodes);
} catch(e) { // IE: requires manual copy
ret = [];
for (i = 0, len = nodes.length; i < len; ++i) {
ret[i] = nodes[i];
}
}
}
return ret;
},
_clearFoundCache: function() {
var foundCache = Selector._foundCache,
i, len;
for (i = 0, len = foundCache.length; i < len; ++i) {
try { // IE no like delete
delete foundCache[i]._found;
} catch(e) {
foundCache[i].removeAttribute('_found');
}
}
foundCache = [];
},
_compare: ('sourceIndex' in document.documentElement) ?
function(nodeA, nodeB) {
var a = nodeA.sourceIndex,
b = nodeB.sourceIndex;
if (a === b) {
return 0;
} else if (a > b) {
return 1;
}
return -1;
} : (document.documentElement[COMPARE_DOCUMENT_POSITION] ?
function(nodeA, nodeB) {
if (nodeA[COMPARE_DOCUMENT_POSITION](nodeB) & 4) {
return -1;
} else {
return 1;
}
} :
function(nodeA, nodeB) {
var rangeA, rangeB, compare;
if (nodeA && nodeB) {
rangeA = nodeA[OWNER_DOCUMENT].createRange();
rangeA.setStart(nodeA, 0);
rangeB = nodeB[OWNER_DOCUMENT].createRange();
rangeB.setStart(nodeB, 0);
compare = rangeA.compareBoundaryPoints(Range.START_TO_END, rangeB);
}
return compare;
}),
_sort: function(nodes) {
if (nodes) {
nodes = Selector._toArray(nodes);
if (nodes.sort) {
nodes.sort(Selector._compare);
}
}
return nodes;
},
_deDupe: function(nodes) {
var ret = [],
cache = Selector._foundCache,
i, node;
for (i = 0, node; node = nodes[i++];) {
if (!node._found) {
ret[ret.length] = cache[cache.length] = node;
node._found = true;
}
}
Selector._clearFoundCache();
return ret;
},
// allows element scoped queries to begin with combinator
// e.g. query('> p', document.body) === query('body > p')
_prepQuery: function(root, selector) {
var groups = selector.split(','),
queries = [],
inDoc = true,
isDocRoot = (root && root.nodeType === 9),
i, len;
if (root) {
if (!isDocRoot) {
root.id = root.id || Y.guid();
// break into separate queries for element scoping
for (i = 0, len = groups.length; i < len; ++i) {
selector = '#' + root.id + ' ' + groups[i]; // prepend with root ID
queries.push({root: root, selector: selector});
}
} else {
queries.push({root: root, selector: selector});
}
}
return queries;
},
_nativeQuery: function(selector, root, firstOnly) {
if (Selector._reUnSupported.test(selector)) {
return Y.Selector.query(selector, root, firstOnly);
}
var ret = firstOnly ? null : [],
queryName = firstOnly ? 'querySelector' : 'querySelectorAll',
result,
queries,
i, query;
root = root || Y.config.doc;
if (selector) {
queries = Selector._prepQuery(root, selector);
ret = [];
for (i = 0, query; query = queries[i++];) {
try {
result = query.root[queryName](query.selector);
if (queryName === 'querySelectorAll') { // convert NodeList to Array
result = Selector._toArray(result);
}
ret = ret.concat(result);
} catch(e) {
Y.log('native selector error: ' + e, 'error', 'Selector');
}
}
if (queries.length > 1) { // remove dupes and sort by doc order
ret = Selector._sort(Selector._deDupe(ret));
}
ret = (firstOnly) ? (ret[0] || null) : ret;
}
return ret;
},
filter: function(nodes, selector) {
var ret = [],
i, node;
if (nodes && selector) {
for (i = 0, node; (node = nodes[i++]);) {
if (Y.Selector.test(node, selector)) {
ret[ret.length] = node;
}
}
} else {
Y.log('invalid filter input (nodes: ' + nodes +
', selector: ' + selector + ')', 'warn', 'Selector');
}
return ret;
},
test: function(node, selector) {
var ret = false,
groups = selector.split(','),
item,
i, group;
if (node && node.tagName) { // only test HTMLElements
if (!node.id) {
node.id = TMP_PREFIX + g_counter++;
}
for (i = 0, group; group = groups[i++];) { // TODO: off-dom test
group += '#' + node.id; // add ID for uniqueness
item = Y.Selector.query(group, node.ownerDocument, true);
ret = (item === node);
if (ret) {
break;
}
}
}
return ret;
}
};
if (Y.UA.ie && Y.UA.ie <= 8) {
Selector._reUnSupported = /:(?:nth|not|root|only|checked|first|last|empty)/;
}
// allow standalone selector-native module
if (Selector._supportsNative() && Selector.useNative) {
Y.Selector.query = Y.Selector.query || Selector._nativeQuery;
}
Y.mix(Y.Selector, Selector, true);
})(Y);