jquery/src/selector-native.js

define( [
	"./core",
	"./var/document",
	"./var/documentElement"
], function( jQuery, document, documentElement ) {

/*
 * Optional (non-Sizzle) selector module for custom builds.
 *
 * Note that this DOES NOT SUPPORT many documented jQuery
 * features in exchange for its smaller size:
 *
 * Attribute not equal selector
 * Positional selectors (:first; :eq(n); :odd; etc.)
 * Type selectors (:input; :checkbox; :button; etc.)
 * State-based selectors (:animated; :visible; :hidden; etc.)
 * :has(selector)
 * :not(complex selector)
 * custom selectors via Sizzle extensions
 * Leading combinators (e.g., $collection.find("> *"))
 * Reliable functionality on XML fragments
 * Requiring all parts of a selector to match elements under context
 *   (e.g., $div.find("div > *") now matches children of $div)
 * Matching against non-elements
 * Reliable sorting of disconnected nodes
 * querySelectorAll bug fixes (e.g., unreliable :focus on WebKit)
 *
 * If any of these are unacceptable tradeoffs, either use Sizzle or
 * customize this stub for the project's specific needs.
 */

var hasDuplicate,
	matches = documentElement.matches ||
		documentElement.webkitMatchesSelector ||
		documentElement.mozMatchesSelector ||
		documentElement.oMatchesSelector ||
		documentElement.msMatchesSelector,
	sortOrder = function( a, b ) {

		// Flag for duplicate removal
		if ( a === b ) {
			hasDuplicate = true;
			return 0;
		}

		var compare = b.compareDocumentPosition &&
			a.compareDocumentPosition &&
			a.compareDocumentPosition( b );

		if ( compare ) {

			// Disconnected nodes
			if ( compare & 1 ) {

				// Choose the first element that is related to our document
				if ( a === document || jQuery.contains( document, a ) ) {
					return -1;
				}
				if ( b === document || jQuery.contains( document, b ) ) {
					return 1;
				}

				// Maintain original order
				return 0;
			}

			return compare & 4 ? -1 : 1;
		}

		// Not directly comparable, sort on existence of method
		return a.compareDocumentPosition ? -1 : 1;
	},
	uniqueSort = function( results ) {
		var elem,
			duplicates = [],
			i = 0,
			j = 0;

		hasDuplicate = false;
		results.sort( sortOrder );

		if ( hasDuplicate ) {
			while ( ( elem = results[ i++ ] ) ) {
				if ( elem === results[ i ] ) {
					j = duplicates.push( i );
				}
			}
			while ( j-- ) {
				results.splice( duplicates[ j ], 1 );
			}
		}

		return results;
	};

jQuery.extend( {
	find: function( selector, context, results, seed ) {
		var elem, nodeType,
			i = 0;

		results = results || [];
		context = context || document;

		// Same basic safeguard as Sizzle
		if ( !selector || typeof selector !== "string" ) {
			return results;
		}

		// Early return if context is not an element or document
		if ( ( nodeType = context.nodeType ) !== 1 && nodeType !== 9 ) {
			return [];
		}

		if ( seed ) {
			while ( ( elem = seed[ i++ ] ) ) {
				if ( jQuery.find.matchesSelector( elem, selector ) ) {
					results.push( elem );
				}
			}
		} else {
			jQuery.merge( results, context.querySelectorAll( selector ) );
		}

		return results;
	},
	uniqueSort: uniqueSort,
	unique: uniqueSort,
	text: function( elem ) {
		var node,
			ret = "",
			i = 0,
			nodeType = elem.nodeType;

		if ( !nodeType ) {

			// If no nodeType, this is expected to be an array
			while ( ( node = elem[ i++ ] ) ) {

				// Do not traverse comment nodes
				ret += jQuery.text( node );
			}
		} else if ( nodeType === 1 || nodeType === 9 || nodeType === 11 ) {

			// Use textContent for elements
			return elem.textContent;
		} else if ( nodeType === 3 || nodeType === 4 ) {
			return elem.nodeValue;
		}

		// Do not include comment or processing instruction nodes

		return ret;
	},
	contains: function( a, b ) {
		var adown = a.nodeType === 9 ? a.documentElement : a,
			bup = b && b.parentNode;
		return a === bup || !!( bup && bup.nodeType === 1 && adown.contains( bup ) );
	},
	isXMLDoc: function( elem ) {
		return ( elem.ownerDocument || elem ).documentElement.nodeName !== "HTML";
	},
	expr: {
		attrHandle: {},
		match: {
			bool: new RegExp( "^(?:checked|selected|async|autofocus|autoplay|controls|defer" +
				"|disabled|hidden|ismap|loop|multiple|open|readonly|required|scoped)$", "i" ),
			needsContext: /^[\x20\t\r\n\f]*[>+~]/
		}
	}
} );

jQuery.extend( jQuery.find, {
	matches: function( expr, elements ) {
		return jQuery.find( expr, null, null, elements );
	},
	matchesSelector: function( elem, expr ) {
		return matches.call( elem, expr );
	},
	attr: function( elem, name ) {
		return elem.getAttribute( name );
	}
} );

} );