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/*

	cssQuery, version 2.0.2 (2005-08-19)

	Copyright: 2004-2005, Dean Edwards (http://dean.edwards.name/)

	License: http://creativecommons.org/licenses/LGPL/2.1/

*/

// the following functions allow querying of the DOM using CSS selectors

var cssQuery = function() {

var version = "2.0.2";

// -----------------------------------------------------------------------

// main query function

// -----------------------------------------------------------------------

var $COMMA = /\s*,\s*/;

var cssQuery = function($selector, $$from) {

try {

	var $match = [];

	var $useCache = arguments.callee.caching && !$$from;

	var $base = ($$from) ? ($$from.constructor == Array) ? $$from : [$$from] : [document];

	// process comma separated selectors

	var $$selectors = parseSelector($selector).split($COMMA), i;

	for (i = 0; i < $$selectors.length; i++) {

		// convert the selector to a stream

		$selector = _toStream($$selectors[i]);

		// faster chop if it starts with id (MSIE only)

		if (isMSIE && $selector.slice(0, 3).join("") == " *#") {

			$selector = $selector.slice(2);

			$$from = _msie_selectById([], $base, $selector[1]);

		} else $$from = $base;

		// process the stream

		var j = 0, $token, $filter, $arguments, $cacheSelector = "";

		while (j < $selector.length) {

			$token = $selector[j++];

			$filter = $selector[j++];

			$cacheSelector += $token + $filter;

			// some pseudo-classes allow arguments to be passed

			//  e.g. nth-child(even)

			$arguments = "";

			if ($selector[j] == "(") {

				while ($selector[j++] != ")" && j < $selector.length) {

					$arguments += $selector[j];

				}

				$arguments = $arguments.slice(0, -1);

				$cacheSelector += "(" + $arguments + ")";

			}

			// process a token/filter pair use cached results if possible

			$$from = ($useCache && cache[$cacheSelector]) ?

				cache[$cacheSelector] : select($$from, $token, $filter, $arguments);

			if ($useCache) cache[$cacheSelector] = $$from;

		}

		$match = $match.concat($$from);

	}

	delete cssQuery.error;

	return $match;

} catch ($error) {

	cssQuery.error = $error;

	return [];

}};

// -----------------------------------------------------------------------

// public interface

// -----------------------------------------------------------------------

cssQuery.toString = function() {

	return "function cssQuery() {\n  [version " + version + "]\n}";

};

// caching

var cache = {};

cssQuery.caching = false;

cssQuery.clearCache = function($selector) {

	if ($selector) {

		$selector = _toStream($selector).join("");

		delete cache[$selector];

	} else cache = {};

};

// allow extensions

var modules = {};

var loaded = false;

cssQuery.addModule = function($name, $script) {

	if (loaded) eval("$script=" + String($script));

	modules[$name] = new $script();;

};

// hackery

cssQuery.valueOf = function($code) {

	return $code ? eval($code) : this;

};

// -----------------------------------------------------------------------

// declarations

// -----------------------------------------------------------------------

var selectors = {};

var pseudoClasses = {};

// a safari bug means that these have to be declared here

var AttributeSelector = {match: /\[([\w-]+(\|[\w-]+)?)\s*(\W?=)?\s*([^\]]*)\]/};

var attributeSelectors = [];

// -----------------------------------------------------------------------

// selectors

// -----------------------------------------------------------------------

// descendant selector

selectors[" "] = function($results, $from, $tagName, $namespace) {

	// loop through current selection

	var $element, i, j;

	for (i = 0; i < $from.length; i++) {

		// get descendants

		var $subset = getElementsByTagName($from[i], $tagName, $namespace);

		// loop through descendants and add to results selection

		for (j = 0; ($element = $subset[j]); j++) {

			if (thisElement($element) && compareNamespace($element, $namespace))

				$results.push($element);

		}

	}

};

// ID selector

selectors["#"] = function($results, $from, $id) {

	// loop through current selection and check ID

	var $element, j;

	for (j = 0; ($element = $from[j]); j++) if ($element.id == $id) $results.push($element);

};

// class selector

selectors["."] = function($results, $from, $className) {

	// create a RegExp version of the class

	$className = new RegExp("(^|\\s)" + $className + "(\\s|$)");

	// loop through current selection and check class

	var $element, i;

	for (i = 0; ($element = $from[i]); i++)

		if ($className.test($element.className)) $results.push($element);

};

// pseudo-class selector

selectors[":"] = function($results, $from, $pseudoClass, $arguments) {

	// retrieve the cssQuery pseudo-class function

	var $test = pseudoClasses[$pseudoClass], $element, i;

	// loop through current selection and apply pseudo-class filter

	if ($test) for (i = 0; ($element = $from[i]); i++)

		// if the cssQuery pseudo-class function returns "true" add the element

		if ($test($element, $arguments)) $results.push($element);

};

// -----------------------------------------------------------------------

// pseudo-classes

// -----------------------------------------------------------------------

pseudoClasses["link"] = function($element) {

	var $document = getDocument($element);

	if ($document.links) for (var i = 0; i < $document.links.length; i++) {

		if ($document.links[i] == $element) return true;

	}

};

pseudoClasses["visited"] = function($element) {

	// can't do this without jiggery-pokery

};

// -----------------------------------------------------------------------

// DOM traversal

// -----------------------------------------------------------------------

// IE5/6 includes comments (LOL) in it's elements collections.

// so we have to check for this. the test is tagName != "!". LOL (again).

var thisElement = function($element) {

	return ($element && $element.nodeType == 1 && $element.tagName != "!") ? $element : null;

};

// return the previous element to the supplied element

//  previousSibling is not good enough as it might return a text or comment node

var previousElementSibling = function($element) {

	while ($element && ($element = $element.previousSibling) && !thisElement($element)) continue;

	return $element;

};

// return the next element to the supplied element

var nextElementSibling = function($element) {

	while ($element && ($element = $element.nextSibling) && !thisElement($element)) continue;

	return $element;

};

// return the first child ELEMENT of an element

//  NOT the first child node (though they may be the same thing)

var firstElementChild = function($element) {

	return thisElement($element.firstChild) || nextElementSibling($element.firstChild);

};

var lastElementChild = function($element) {

	return thisElement($element.lastChild) || previousElementSibling($element.lastChild);

};

// return child elements of an element (not child nodes)

var childElements = function($element) {

	var $childElements = [];

	$element = firstElementChild($element);

	while ($element) {

		$childElements.push($element);

		$element = nextElementSibling($element);

	}

	return $childElements;

};

// -----------------------------------------------------------------------

// browser compatibility

// -----------------------------------------------------------------------

// all of the functions in this section can be overwritten. the default

//  configuration is for IE. The functions below reflect this. standard

//  methods are included in a separate module. It would probably be better

//  the other way round of course but this makes it easier to keep IE7 trim.

var isMSIE = true;

var isXML = function($element) {

	var $document = getDocument($element);

	return (typeof $document.mimeType == "unknown") ?

		/\.xml$/i.test($document.URL) :

		Boolean($document.mimeType == "XML Document");

};

// return the element's containing document

var getDocument = function($element) {

	return $element.ownerDocument || $element.document;

};

var getElementsByTagName = function($element, $tagName) {

	return ($tagName == "*" && $element.all) ? $element.all : $element.getElementsByTagName($tagName);

};

var compareTagName = function($element, $tagName, $namespace) {

	if ($tagName == "*") return thisElement($element);

	if (!compareNamespace($element, $namespace)) return false;

	if (!isXML($element)) $tagName = $tagName.toUpperCase();

	return $element.tagName == $tagName;

};

var compareNamespace = function($element, $namespace) {

	return !$namespace || ($namespace == "*") || ($element.scopeName == $namespace);

};

var getTextContent = function($element) {

	return $element.innerText;

};

function _msie_selectById($results, $from, id) {

	var $match, i, j;

	for (i = 0; i < $from.length; i++) {

		if ($match = $from[i].all.item(id)) {

			if ($match.id == id) $results.push($match);

			else if ($match.length != null) {

				for (j = 0; j < $match.length; j++) {

					if ($match[j].id == id) $results.push($match[j]);

				}

			}

		}

	}

	return $results;

};

// for IE5.0

if (![].push) Array.prototype.push = function() {

	for (var i = 0; i < arguments.length; i++) {

		this[this.length] = arguments[i];

	}

	return this.length;

};

// -----------------------------------------------------------------------

// query support

// -----------------------------------------------------------------------

// select a set of matching elements.

// "from" is an array of elements.

// "token" is a character representing the type of filter

//  e.g. ">" means child selector

// "filter" represents the tag name, id or class name that is being selected

// the function returns an array of matching elements

var $NAMESPACE = /\|/;

function select($$from, $token, $filter, $arguments) {

	if ($NAMESPACE.test($filter)) {

		$filter = $filter.split($NAMESPACE);

		$arguments = $filter[0];

		$filter = $filter[1];

	}

	var $results = [];

	if (selectors[$token]) {

		selectors[$token]($results, $$from, $filter, $arguments);

	}

	return $results;

};

// -----------------------------------------------------------------------

// parsing

// -----------------------------------------------------------------------

// convert css selectors to a stream of tokens and filters

//  it's not a real stream. it's just an array of strings.

var $STANDARD_SELECT = /^[^\s>+~]/;

var $$STREAM = /[\s#.:>+~()@]|[^\s#.:>+~()@]+/g;

function _toStream($selector) {

	if ($STANDARD_SELECT.test($selector)) $selector = " " + $selector;

	return $selector.match($$STREAM) || [];

};

var $WHITESPACE = /\s*([\s>+~(),]|^|$)\s*/g;

var $IMPLIED_ALL = /([\s>+~,]|[^(]\+|^)([#.:@])/g;

var parseSelector = function($selector) {

	return $selector

	// trim whitespace

	.replace($WHITESPACE, "$1")

	// e.g. ".class1" --> "*.class1"

	.replace($IMPLIED_ALL, "$1*$2");

};

var Quote = {

	toString: function() {return "'"},

	match: /^('[^']*')|("[^"]*")$/,

	test: function($string) {

		return this.match.test($string);

	},

	add: function($string) {

		return this.test($string) ? $string : this + $string + this;

	},

	remove: function($string) {

		return this.test($string) ? $string.slice(1, -1) : $string;

	}

};

var getText = function($text) {

	return Quote.remove($text);

};

var $ESCAPE = /([\/()[\]?{}|*+-])/g;

function regEscape($string) {

	return $string.replace($ESCAPE, "\\$1");

};

// -----------------------------------------------------------------------

// modules

// -----------------------------------------------------------------------

// -------- >>      insert modules here for packaging       << -------- \\

loaded = true;

// -----------------------------------------------------------------------

// return the query function

// -----------------------------------------------------------------------

return cssQuery;

}(); // cssQuery