/**
 * A module of various browser polyfills
 * @file polyfill.js
 */
(function(){

	"use strict";
 
	// Console.log polyfill for IE 8 stupidity
	if(typeof window.console === "undefined")
	{
		window.console = {
			log:function(){}
		};
	}
	
	// --------------------------------------------------------------------------
	
	/**
	 * String trim function polyfill
	 */
	if(typeof String.prototype.trim === "undefined")
	{
		/**
		 * @private
		 */
		String.prototype.trim = function()
		{
			return this.replace(/^[\s\uFEFF]+|[\s\uFEFF]+$/g, "");
		};
	}
	
	// --------------------------------------------------------------------------
	
	//This is used so IE 8 can use the classList api
	/*
	 * classList.js: Cross-browser full element.classList implementation.
	 * 2011-06-15
	 *
	 * By Eli Grey, http://eligrey.com
	 * Public Domain.
	 * NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
	 */
	
	if (typeof document !== "undefined" && !("classList" in document.createElement("a")))
	{
		(function (view){
		
			var classListProp = "classList",
				protoProp = "prototype",
				elemCtrProto = (view.HTMLElement || view.Element)[protoProp],
				objCtr = Object,
				strTrim = String[protoProp].trim ||
				function ()
				{
					return this.replace(/^\s+|\s+$/g, "");
				},
				arrIndexOf = Array[protoProp].indexOf ||
				function (item)
				{
					var
					i = 0,
						len = this.length;
					for (; i < len; i++)
					{
						if (i in this && this[i] === item)
						{
							return i;
						}
					}
					return -1;
				}
				// Vendors: please allow content code to instantiate DOMExceptions
				,
				/**
				 * @private
				 */
				DOMEx = function (type, message)
				{
					this.name = type;
					this.code = DOMException[type];
					this.message = message;
				},
				/**
				 * @private
				 */
				checkTokenAndGetIndex = function (classList, token)
				{
					if (token === "")
					{
						throw new DOMEx("SYNTAX_ERR", "An invalid or illegal string was specified");
					}
					if (/\s/.test(token))
					{
						throw new DOMEx("INVALID_CHARACTER_ERR", "String contains an invalid character");
					}
					return arrIndexOf.call(classList, token);
				},
				/**
				 * @private
				 */
				ClassList = function (elem)
				{
					var
					trimmedClasses = strTrim.call(elem.className),
						classes = trimmedClasses ? trimmedClasses.split(/\s+/) : [],
						i = 0,
						len = classes.length;
					for (; i < len; i++)
					{
						this.push(classes[i]);
					}
					this._updateClassName = function ()
					{
						elem.className = this.toString();
					};
				},
				classListProto = ClassList[protoProp] = [],
				/**
				 * @private
				 */
				classListGetter = function ()
				{
					return new ClassList(this);
				};
			// Most DOMException implementations don't allow calling DOMException's toString()
			// on non-DOMExceptions. Error's toString() is sufficient here.
			DOMEx[protoProp] = Error[protoProp];
			classListProto.item = function (i)
			{
				return this[i] || null;
			};
			classListProto.contains = function (token)
			{
				token += "";
				return checkTokenAndGetIndex(this, token) !== -1;
			};
			classListProto.add = function (token)
			{
				token += "";
				if (checkTokenAndGetIndex(this, token) === -1)
				{
					this.push(token);
					this._updateClassName();
				}
			};
			classListProto.remove = function (token)
			{
				token += "";
				var index = checkTokenAndGetIndex(this, token);
				if (index !== -1)
				{
					this.splice(index, 1);
					this._updateClassName();
				}
			};
			classListProto.toggle = function (token)
			{
				token += "";
				if (checkTokenAndGetIndex(this, token) === -1)
				{
					this.add(token);
				}
				else
				{
					this.remove(token);
				}
			};
			classListProto.toString = function ()
			{
				return this.join(" ");
			};
	
			if (objCtr.defineProperty)
			{
				var classListPropDesc = {
					get: classListGetter,
					enumerable: true,
					configurable: true
				};
				try
				{
					objCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);
				}
				catch (ex)
				{ // IE 8 doesn't support enumerable:true
					if (ex.number === -0x7FF5EC54)
					{
						classListPropDesc.enumerable = false;
						objCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);
					}
				}
			}
			else if (objCtr[protoProp].__defineGetter__)
			{
				elemCtrProto.__defineGetter__(classListProp, classListGetter);
			}
	
		}(self));
	}
}());