/*

selectivizr v1.0.2 - (c) Keith Clark, freely distributable under the terms 

of the MIT license.



selectivizr.com

*/

/* 

  

Notes about this source

-----------------------



 * The #DEBUG_START and #DEBUG_END comments are used to mark blocks of code

   that will be removed prior to building a final release version (using a

   pre-compression script)

  

  

References:

-----------

 

 * CSS Syntax          : http://www.w3.org/TR/2003/WD-css3-syntax-20030813/#style

 * Selectors           : http://www.w3.org/TR/css3-selectors/#selectors

 * IE Compatability    : http://msdn.microsoft.com/en-us/library/cc351024(VS.85).aspx

 * W3C Selector Tests  : http://www.w3.org/Style/CSS/Test/CSS3/Selectors/current/html/tests/

 

*/



(function(win) {



	// If browser isn't IE, then stop execution! This handles the script 

	// being loaded by non IE browsers because the developer didn't use 

	// conditional comments.

	if (/*@cc_on!@*/true) return;



	// =========================== Init Objects ============================



	var doc = document;

	var root = doc.documentElement;

	var xhr = getXHRObject();

	var ieVersion = /MSIE (\d+)/.exec(navigator.userAgent)[1];

	

	// If were not in standards mode, IE is too old / new or we can't create

	// an XMLHttpRequest object then we should get out now.

	if (doc.compatMode != 'CSS1Compat' || ieVersion<6 || ieVersion>8 || !xhr) {

		return;

	}

	

	

	// ========================= Common Objects ============================



	// Compatiable selector engines in order of CSS3 support. Note: '*' is

	// a placholder for the object key name. (basically, crude compression)

	var selectorEngines = {

		"NW"								: "*.Dom.select",

		"MooTools"							: "$$",

		"DOMAssistant"						: "*.$", 

		"Prototype"							: "$$",

		"YAHOO"								: "*.util.Selector.query",

		"Sizzle"							: "*", 

		"jQuery"							: "*",

		"dojo"								: "*.query"

	};



	var selectorMethod;

	var enabledWatchers 					= [];     // array of :enabled/:disabled elements to poll

	var ie6PatchID 							= 0;      // used to solve ie6's multiple class bug

	var patchIE6MultipleClasses				= true;   // if true adds class bloat to ie6

	var namespace 							= "slvzr";

	

	// Stylesheet parsing regexp's

	var RE_COMMENT							= /(\/\*[^*]*\*+([^\/][^*]*\*+)*\/)\s*/g;

	var RE_IMPORT							= /@import\s*(?:(?:(?:url\(\s*(['"]?)(.*)\1)\s*\))|(?:(['"])(.*)\3))[^;]*;/g;

	var RE_ASSET_URL 						= /\burl\(\s*(["']?)(?!data:)([^"')]+)\1\s*\)/g;

	var RE_PSEUDO_STRUCTURAL				= /^:(empty|(first|last|only|nth(-last)?)-(child|of-type))$/;

	var RE_PSEUDO_ELEMENTS					= /:(:first-(?:line|letter))/g;

	var RE_SELECTOR_GROUP					= /(^|})\s*([^\{]*?[\[:][^{]+)/g;

	var RE_SELECTOR_PARSE					= /([ +~>])|(:[a-z-]+(?:\(.*?\)+)?)|(\[.*?\])/g; 

	var RE_LIBRARY_INCOMPATIBLE_PSEUDOS		= /(:not\()?:(hover|enabled|disabled|focus|checked|target|active|visited|first-line|first-letter)\)?/g;

	var RE_PATCH_CLASS_NAME_REPLACE			= /[^\w-]/g;

	

	// HTML UI element regexp's

	var RE_INPUT_ELEMENTS					= /^(INPUT|SELECT|TEXTAREA|BUTTON)$/;

	var RE_INPUT_CHECKABLE_TYPES			= /^(checkbox|radio)$/;



	// Broken attribute selector implementations (IE7/8 native [^=""], [$=""] and [*=""])

	var BROKEN_ATTR_IMPLEMENTATIONS			= ieVersion>6 ? /[\$\^*]=(['"])\1/ : null;



	// Whitespace normalization regexp's

	var RE_TIDY_TRAILING_WHITESPACE			= /([(\[+~])\s+/g;

	var RE_TIDY_LEADING_WHITESPACE			= /\s+([)\]+~])/g;

	var RE_TIDY_CONSECUTIVE_WHITESPACE		= /\s+/g;

	var RE_TIDY_TRIM_WHITESPACE				= /^\s*((?:[\S\s]*\S)?)\s*$/;

	

	// String constants

	var EMPTY_STRING						= "";

	var SPACE_STRING						= " ";

	var PLACEHOLDER_STRING					= "$1";



	// =========================== Patching ================================



	// --[ patchStyleSheet() ]----------------------------------------------

	// Scans the passed cssText for selectors that require emulation and

	// creates one or more patches for each matched selector.

	function patchStyleSheet( cssText ) {

		return cssText.replace(RE_PSEUDO_ELEMENTS, PLACEHOLDER_STRING).

			replace(RE_SELECTOR_GROUP, function(m, prefix, selectorText) {	

    			var selectorGroups = selectorText.split(",");

    			for (var c = 0, cs = selectorGroups.length; c < cs; c++) {

    				var selector = normalizeSelectorWhitespace(selectorGroups[c]) + SPACE_STRING;

    				var patches = [];

    				selectorGroups[c] = selector.replace(RE_SELECTOR_PARSE, 

    					function(match, combinator, pseudo, attribute, index) {

    						if (combinator) {

    							if (patches.length>0) {

    								applyPatches( selector.substring(0, index), patches );

    								patches = [];

    							}

    							return combinator;

    						}		

    						else {

    							var patch = (pseudo) ? patchPseudoClass( pseudo ) : patchAttribute( attribute );

    							if (patch) {

    								patches.push(patch);

    								return "." + patch.className;

    							}

    							return match;

    						}

    					}

    				);

    			}

    			return prefix + selectorGroups.join(",");

    		});

	};



	// --[ patchAttribute() ]-----------------------------------------------

	// returns a patch for an attribute selector.

	function patchAttribute( attr ) {

		return (!BROKEN_ATTR_IMPLEMENTATIONS || BROKEN_ATTR_IMPLEMENTATIONS.test(attr)) ? 

			{ className: createClassName(attr), applyClass: true } : null;

	};



	// --[ patchPseudoClass() ]---------------------------------------------

	// returns a patch for a pseudo-class

	function patchPseudoClass( pseudo ) {



		var applyClass = true;

		var className = createClassName(pseudo.slice(1));

		var isNegated = pseudo.substring(0, 5) == ":not(";

		var activateEventName;

		var deactivateEventName;



		// if negated, remove :not() 

		if (isNegated) {

			pseudo = pseudo.slice(5, -1);

		}

		

		// bracket contents are irrelevant - remove them

		var bracketIndex = pseudo.indexOf("(")

		if (bracketIndex > -1) {

			pseudo = pseudo.substring(0, bracketIndex);

		}		

		

		// check we're still dealing with a pseudo-class

		if (pseudo.charAt(0) == ":") {

			switch (pseudo.slice(1)) {



				case "root":

					applyClass = function(e) {

						return isNegated ? e != root : e == root;

					}

					break;



				case "target":

					// :target is only supported in IE8

					if (ieVersion == 8) {

						applyClass = function(e) {

							var handler = function() { 

								var hash = location.hash;

								var hashID = hash.slice(1);

								return isNegated ? (hash == EMPTY_STRING || e.id != hashID) : (hash != EMPTY_STRING && e.id == hashID);

							};

							addEvent( win, "hashchange", function() {

								toggleElementClass(e, className, handler());

							})

							return handler();

						}

						break;

					}

					return false;

				

				case "checked":

					applyClass = function(e) { 

						if (RE_INPUT_CHECKABLE_TYPES.test(e.type)) {

							addEvent( e, "propertychange", function() {

								if (event.propertyName == "checked") {

									toggleElementClass( e, className, e.checked !== isNegated );

								} 							

							})

						}

						return e.checked !== isNegated;

					}

					break;

					

				case "disabled":

					isNegated = !isNegated;



				case "enabled":

					applyClass = function(e) { 

						if (RE_INPUT_ELEMENTS.test(e.tagName)) {

							addEvent( e, "propertychange", function() {

								if (event.propertyName == "$disabled") {

									toggleElementClass( e, className, e.$disabled === isNegated );

								} 

							});

							enabledWatchers.push(e);

							e.$disabled = e.disabled;

							return e.disabled === isNegated;

						}

						return pseudo == ":enabled" ? isNegated : !isNegated;

					}

					break;

					

				case "focus":

					activateEventName = "focus";

					deactivateEventName = "blur";

								

				case "hover":

					if (!activateEventName) {

						activateEventName = "mouseenter";

						deactivateEventName = "mouseleave";

					}

					applyClass = function(e) {

						addEvent( e, isNegated ? deactivateEventName : activateEventName, function() {

							toggleElementClass( e, className, true );

						})

						addEvent( e, isNegated ? activateEventName : deactivateEventName, function() {

							toggleElementClass( e, className, false );

						})

						return isNegated;

					}

					break;

					

				// everything else

				default:

					// If we don't support this pseudo-class don't create 

					// a patch for it

					if (!RE_PSEUDO_STRUCTURAL.test(pseudo)) {

						return false;

					}

					break;

			}

		}

		return { className: className, applyClass: applyClass };

	};



	// --[ applyPatches() ]-------------------------------------------------

	// uses the passed selector text to find DOM nodes and patch them	

	function applyPatches(selectorText, patches) {

		var elms;

		

		// Although some selector libraries can find :checked :enabled etc. 

		// we need to find all elements that could have that state because 

		// it can be changed by the user.

		var domSelectorText = selectorText.replace(RE_LIBRARY_INCOMPATIBLE_PSEUDOS, EMPTY_STRING);

		

		// If the dom selector equates to an empty string or ends with 

		// whitespace then we need to append a universal selector (*) to it.

		if (domSelectorText == EMPTY_STRING || domSelectorText.charAt(domSelectorText.length - 1) == SPACE_STRING) {

			domSelectorText += "*";

		}

		

		// Ensure we catch errors from the selector library

		try {

			elms = selectorMethod( domSelectorText );

		} catch (ex) {

			// #DEBUG_START

			log( "Selector '" + selectorText + "' threw exception '" + ex + "'" );

			// #DEBUG_END

		}





		if (elms) {

			for (var d = 0, dl = elms.length; d < dl; d++) {	

				var elm = elms[d];

				var cssClasses = elm.className;

				for (var f = 0, fl = patches.length; f < fl; f++) {

					var patch = patches[f];

					

					if (!hasPatch(elm, patch)) {

						if (patch.applyClass && (patch.applyClass === true || patch.applyClass(elm) === true)) {

							cssClasses = toggleClass(cssClasses, patch.className, true );

						}

					}

				}

				elm.className = cssClasses;

			}

		}

	};



	// --[ hasPatch() ]-----------------------------------------------------

	// checks for the exsistence of a patch on an element

	function hasPatch( elm, patch ) {

		return new RegExp("(^|\\s)" + patch.className + "(\\s|$)").test(elm.className);

	};

	

	

	// =========================== Utility =================================

	

	function createClassName( className ) {

		return namespace + "-" + ((ieVersion == 6 && patchIE6MultipleClasses) ?

			ie6PatchID++

		:

			className.replace(RE_PATCH_CLASS_NAME_REPLACE, function(a) { return a.charCodeAt(0) }));

	};



	// --[ log() ]----------------------------------------------------------

	// #DEBUG_START

	function log( message ) {

		if (win.console) {

			win.console.log(message);

		}

	};

	// #DEBUG_END



	// --[ trim() ]---------------------------------------------------------

	// removes leading, trailing whitespace from a string

	function trim( text ) {

		return text.replace(RE_TIDY_TRIM_WHITESPACE, PLACEHOLDER_STRING);

	};



	// --[ normalizeWhitespace() ]------------------------------------------

	// removes leading, trailing and consecutive whitespace from a string

	function normalizeWhitespace( text ) {

		return trim(text).replace(RE_TIDY_CONSECUTIVE_WHITESPACE, SPACE_STRING);

	};



	// --[ normalizeSelectorWhitespace() ]----------------------------------

	// tidies whitespace around selector brackets and combinators

	function normalizeSelectorWhitespace( selectorText ) {

		return normalizeWhitespace(selectorText.

			replace(RE_TIDY_TRAILING_WHITESPACE, PLACEHOLDER_STRING).

			replace(RE_TIDY_LEADING_WHITESPACE, PLACEHOLDER_STRING)

		);

	};



	// --[ toggleElementClass() ]-------------------------------------------

	// toggles a single className on an element

	function toggleElementClass( elm, className, on ) {

		var oldClassName = elm.className;

		var newClassName = toggleClass(oldClassName, className, on);

		if (newClassName != oldClassName) {

			elm.className = newClassName;

			elm.parentNode.className += EMPTY_STRING;

		}

	};



	// --[ toggleClass() ]--------------------------------------------------

	// adds / removes a className from a string of classNames. Used to 

	// manage multiple class changes without forcing a DOM redraw

	function toggleClass( classList, className, on ) {

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

		var classExists = re.test(classList);

		if (on) {

			return classExists ? classList : classList + SPACE_STRING + className;

		} else {

			return classExists ? trim(classList.replace(re, PLACEHOLDER_STRING)) : classList;

		}

	};

	

	// --[ addEvent() ]-----------------------------------------------------

	function addEvent(elm, eventName, eventHandler) {

		elm.attachEvent("on" + eventName, eventHandler);

	};



	// --[ getXHRObject() ]-------------------------------------------------

	function getXHRObject()

	{

		if (win.XMLHttpRequest) {

			return new XMLHttpRequest;

		}

		try	{ 

			return new ActiveXObject('Microsoft.XMLHTTP');

		} catch(e) { 

			return null;

		}

	};



	// --[ loadStyleSheet() ]-----------------------------------------------

	function loadStyleSheet( url ) {

		xhr.open("GET", url, false);

		xhr.send();

		return (xhr.status==200) ? xhr.responseText : EMPTY_STRING;	

	};

	

	// --[ resolveUrl() ]---------------------------------------------------

	// Converts a URL fragment to a fully qualified URL using the specified

	// context URL. Returns null if same-origin policy is broken

	function resolveUrl( url, contextUrl ) {

	

		function getProtocolAndHost( url ) {

			return url.substring(0, url.indexOf("/", 8));

		};

		

		// absolute path

		if (/^https?:\/\//i.test(url)) {

			return getProtocolAndHost(contextUrl) == getProtocolAndHost(url) ? url : null;

		}

		

		// root-relative path

		if (url.charAt(0)=="/")	{

			return getProtocolAndHost(contextUrl) + url;

		}



		// relative path

		var contextUrlPath = contextUrl.split(/[?#]/)[0]; // ignore query string in the contextUrl	

		if (url.charAt(0) != "?" && contextUrlPath.charAt(contextUrlPath.length - 1) != "/") {

			contextUrlPath = contextUrlPath.substring(0, contextUrlPath.lastIndexOf("/") + 1);

		}

		

		return contextUrlPath + url;

	};

	

	// --[ parseStyleSheet() ]----------------------------------------------

	// Downloads the stylesheet specified by the URL, removes it's comments

	// and recursivly replaces @import rules with their contents, ultimately

	// returning the full cssText.

	function parseStyleSheet( url ) {

		if (url) {

			return loadStyleSheet(url).replace(RE_COMMENT, EMPTY_STRING).

			replace(RE_IMPORT, function( match, quoteChar, importUrl, quoteChar2, importUrl2 ) { 

				return parseStyleSheet(resolveUrl(importUrl || importUrl2, url));

			}).

			replace(RE_ASSET_URL, function( match, quoteChar, assetUrl ) { 

				quoteChar = quoteChar || EMPTY_STRING;

				return " url(" + quoteChar + resolveUrl(assetUrl, url) + quoteChar + ") "; 

			});

		}

		return EMPTY_STRING;

	};

	

	// --[ init() ]---------------------------------------------------------

	function init() {

		// honour the <base> tag

		var url, stylesheet;

		var baseTags = doc.getElementsByTagName("BASE");

		var baseUrl = (baseTags.length > 0) ? baseTags[0].href : doc.location.href;

		

		/* Note: This code prevents IE from freezing / crashing when using 

		@font-face .eot files but it modifies the <head> tag and could

		trigger the IE stylesheet limit. It will also cause FOUC issues.

		If you choose to use it, make sure you comment out the for loop 

		directly below this comment.



		var head = doc.getElementsByTagName("head")[0];

		for (var c=doc.styleSheets.length-1; c>=0; c--) {

			stylesheet = doc.styleSheets[c]

			head.appendChild(doc.createElement("style"))

			var patchedStylesheet = doc.styleSheets[doc.styleSheets.length-1];

			

			if (stylesheet.href != EMPTY_STRING) {

				url = resolveUrl(stylesheet.href, baseUrl)

				if (url) {

					patchedStylesheet.cssText = patchStyleSheet( parseStyleSheet( url ) )

					stylesheet.disabled = true

					setTimeout( function () {

						stylesheet.owningElement.parentNode.removeChild(stylesheet.owningElement)

					})

				}

			}

		}

		*/

		

		for (var c = 0; c < doc.styleSheets.length; c++) {

			stylesheet = doc.styleSheets[c]

			if (stylesheet.href != EMPTY_STRING) {

				url = resolveUrl(stylesheet.href, baseUrl);

				if (url) {

					stylesheet.cssText = patchStyleSheet( parseStyleSheet( url ) );

				}

			}

		}

		

		// :enabled & :disabled polling script (since we can't hook 

		// onpropertychange event when an element is disabled) 

		if (enabledWatchers.length > 0) {

			setInterval( function() {

				for (var c = 0, cl = enabledWatchers.length; c < cl; c++) {

					var e = enabledWatchers[c];

					if (e.disabled !== e.$disabled) {

						if (e.disabled) {

							e.disabled = false;

							e.$disabled = true;

							e.disabled = true;

						}

						else {

							e.$disabled = e.disabled;

						}

					}

				}

			},250)

		}

	};

	

	// Bind selectivizr to the ContentLoaded event. 

	ContentLoaded(win, function() {

		// Determine the "best fit" selector engine

		for (var engine in selectorEngines) {

			var members, member, context = win;

			if (win[engine]) {

				members = selectorEngines[engine].replace("*", engine).split(".");

				while ((member = members.shift()) && (context = context[member])) {}

				if (typeof context == "function") {

					selectorMethod = context;

					init();

					return;

				}

			}

		}

	});

	

	

	/*!

	 * ContentLoaded.js by Diego Perini, modified for IE<9 only (to save space)

	 *

	 * Author: Diego Perini (diego.perini at gmail.com)

	 * Summary: cross-browser wrapper for DOMContentLoaded

	 * Updated: 20101020

	 * License: MIT

	 * Version: 1.2

	 *

	 * URL:

	 * http://javascript.nwbox.com/ContentLoaded/

	 * http://javascript.nwbox.com/ContentLoaded/MIT-LICENSE

	 *

	 */



	// @w window reference

	// @f function reference

	function ContentLoaded(win, fn) {



		var done = false, top = true,

		init = function(e) {

			if (e.type == "readystatechange" && doc.readyState != "complete") return;

			(e.type == "load" ? win : doc).detachEvent("on" + e.type, init, false);

			if (!done && (done = true)) fn.call(win, e.type || e);

		},

		poll = function() {

			try { root.doScroll("left"); } catch(e) { setTimeout(poll, 50); return; }

			init('poll');

		};



		if (doc.readyState == "complete") fn.call(win, EMPTY_STRING);

		else {

			if (doc.createEventObject && root.doScroll) {

				try { top = !win.frameElement; } catch(e) { }

				if (top) poll();

			}

			addEvent(doc,"readystatechange", init);

			addEvent(win,"load", init);

		}

	};

})(this);