/*
Copyright (c) 2010, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.com/yui/license.html
version: 3.2.0
build: nightly
*/
YUI.add('selector-native', function(Y) {

(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';

var Selector = {
    _foundCache: [],

    useNative: true,

    _compare: ('sourceIndex' in Y.config.doc.documentElement) ?
        function(nodeA, nodeB) {
            var a = nodeA.sourceIndex,
                b = nodeB.sourceIndex;

            if (a === b) {
                return 0;
            } else if (a > b) {
                return 1;
            }

            return -1;

        } : (Y.config.doc.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(1, rangeB); // 1 === Range.START_TO_END
            }

            return compare;
        
    }),

    _sort: function(nodes) {
        if (nodes) {
            nodes = Y.Array(nodes, 0, true);
            if (nodes.sort) {
                nodes.sort(Selector._compare);
            }
        }

        return nodes;
    },

    _deDupe: function(nodes) {
        var ret = [],
            i, node;

        for (i = 0; (node = nodes[i++]);) {
            if (!node._found) {
                ret[ret.length] = node;
                node._found = true;
            }
        }

        for (i = 0; (node = ret[i++]);) {
            node._found = null;
            node.removeAttribute('_found');
        }

        return ret;
    },

    /**
     * Retrieves a set of nodes based on a given CSS selector. 
     * @method query
     *
     * @param {string} selector The CSS Selector to test the node against.
     * @param {HTMLElement} root optional An HTMLElement to start the query from. Defaults to Y.config.doc
     * @param {Boolean} firstOnly optional Whether or not to return only the first match.
     * @return {Array} An array of nodes that match the given selector.
     * @static
     */
    query: function(selector, root, firstOnly, skipNative) {
        root = root || Y.config.doc;
        var ret = [],
            useNative = (Y.Selector.useNative && Y.config.doc.querySelector && !skipNative),
            queries = [[selector, root]],
            query,
            result,
            i,
            fn = (useNative) ? Y.Selector._nativeQuery : Y.Selector._bruteQuery;

        if (selector && fn) {
            // split group into seperate queries
            if (!skipNative && // already done if skipping
                    (!useNative || root.tagName)) { // split native when element scoping is needed
                queries = Selector._splitQueries(selector, root);
            }

            for (i = 0; (query = queries[i++]);) {
                result = fn(query[0], query[1], firstOnly);
                if (!firstOnly) { // coerce DOM Collection to Array
                    result = Y.Array(result, 0, true);
                }
                if (result) {
                    ret = ret.concat(result);
                }
            }

            if (queries.length > 1) { // remove dupes and sort by doc order 
                ret = Selector._sort(Selector._deDupe(ret));
            }
        }

        return (firstOnly) ? (ret[0] || null) : ret;

    },

    // allows element scoped queries to begin with combinator
    // e.g. query('> p', document.body) === query('body > p')
    _splitQueries: function(selector, node) {
        var groups = selector.split(','),
            queries = [],
            prefix = '',
            i, len;

        if (node) {
            // enforce for element scoping
            if (node.tagName) {
                node.id = node.id || Y.guid();
                prefix = '[id="' + node.id + '"] ';
            }

            for (i = 0, len = groups.length; i < len; ++i) {
                selector =  prefix + groups[i];
                queries.push([selector, node]);
            }
        }

        return queries;
    },

    _nativeQuery: function(selector, root, one) {
        if (Y.UA.webkit && selector.indexOf(':checked') > -1 &&
                (Y.Selector.pseudos && Y.Selector.pseudos.checked)) { // webkit (chrome, safari) fails to find "selected"
            return Y.Selector.query(selector, root, one, true); // redo with skipNative true to try brute query
        }
        try {
            return root['querySelector' + (one ? '' : 'All')](selector);
        } catch(e) { // fallback to brute if available
            return Y.Selector.query(selector, root, one, true); // redo with skipNative true
        }
    },

    filter: function(nodes, selector) {
        var ret = [],
            i, node;

        if (nodes && selector) {
            for (i = 0; (node = nodes[i++]);) {
                if (Y.Selector.test(node, selector)) {
                    ret[ret.length] = node;
                }
            }
        } else {
        }

        return ret;
    },

    test: function(node, selector, root) {
        var ret = false,
            groups = selector.split(','),
            useFrag = false,
            parent,
            item,
            items,
            frag,
            i, j, group;

        if (node && node.tagName) { // only test HTMLElements

            // we need a root if off-doc
            if (!root && !Y.DOM.inDoc(node)) {
                parent = node.parentNode;
                if (parent) { 
                    root = parent;
                } else { // only use frag when no parent to query
                    frag = node[OWNER_DOCUMENT].createDocumentFragment();
                    frag.appendChild(node);
                    root = frag;
                    useFrag = true;
                }
            }
            root = root || node[OWNER_DOCUMENT];

            if (!node.id) {
                node.id = Y.guid();
            }
            for (i = 0; (group = groups[i++]);) { // TODO: off-dom test
                group += '[id="' + node.id + '"]';
                items = Y.Selector.query(group, root);

                for (j = 0; item = items[j++];) {
                    if (item === node) {
                        ret = true;
                        break;
                    }
                }
                if (ret) {
                    break;
                }
            }

            if (useFrag) { // cleanup
                frag.removeChild(node);
            }
        }

        return ret;
    },

    /**
     * A convenience function to emulate Y.Node's aNode.ancestor(selector).
     * @param {HTMLElement} element An HTMLElement to start the query from.
     * @param {String} selector The CSS selector to test the node against.
     * @return {HTMLElement} The ancestor node matching the selector, or null.
     * @param {Boolean} testSelf optional Whether or not to include the element in the scan 
     * @static
     * @method ancestor
     */
    ancestor: function (element, selector, testSelf) {
        return Y.DOM.ancestor(element, function(n) {
            return Y.Selector.test(n, selector);
        }, testSelf);
    }
};

Y.mix(Y.Selector, Selector, true);

})(Y);


}, '3.2.0' ,{requires:['dom-base']});
