/*
	Source: classbehaviours.utilities.js
	ClassBehaviours is a javascript framework based on class-name parsing.
	Copyright 2011 by Maurice van Creij and published on http://www.woollymittens.nl/
	This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
*/

	// CLASSBEHAVIOURS CLASS
	// create the root classbehaviours object if it doesn't already exist
	if(typeof(classBehaviours)=='undefined') classBehaviours = {};

		// COMMON UTILITY FUNCTIONS
		// create the utilities child object if it doesn't already exist
		if(typeof(classBehaviours.utilities)=='undefined') classBehaviours.utilities = {
			// returns all nodes of the same class
			getElementsByClassName : function(className, node){
				// use the whole body if no target was provided
				var target = (node!=null) ? node : document ;
				// make an empty array for the results
				var foundNodes = new Array();
				// make a regular expression to recognise the class name
				var wantedClass = new RegExp('\\b'+className+'\\b');
				// for all elements in the parent node
				var allNodes = (target.all) ? target.all : target.getElementsByTagName("*");
				for(var a=0; a<allNodes.length; a++){
					// if the classname was found add it to the results
					if(wantedClass.test(allNodes[a].className)) foundNodes[foundNodes.length] = allNodes[a];
				}
				// return the list
				return foundNodes;
			},
			// gets the value of a parameter from a className
			getClassParameter : function(targetNode, paramName, defaultValue){
				if(targetNode!=null){
					var parameterValue = (targetNode.className.indexOf(' ' + paramName + '_')>-1) ?
						targetNode.className.split(' ' + paramName + '_')[1].split(' ')[0] :
						defaultValue ;
					return (isNaN(defaultValue) || defaultValue==null || defaultValue=='' || typeof(defaultValue)!='string') ?
						parameterValue :
						parseFloat(parameterValue.replace('D','.'));
				}else{
					return defaultValue;
				}
			},
			// sets the value of a parameter from a className
			setClassParameter : function(targetNode, paramName, newValue){
				if(targetNode!=null){
					// create a default value, if there isn't one
					if(targetNode.className==null) targetNode.className = '';
					if(targetNode.className.indexOf(' ' + paramName + '_')<0) targetNode.className += ' ' + paramName + '_0';
					// get the old value
					oldValue = this.getClassParameter(targetNode, paramName, null);
					// replace the old value
					if(oldValue!=null) targetNode.className = targetNode.className.replace(paramName+'_'+oldValue, paramName+'_'+newValue);
				}
			},
			// get the next node without worrying about text nodes
			nextNode : function(targetNode, count){
				var testNode = targetNode;
				if(count==null) count = 1;
				for(var a=0; a<count; a++){
					do {
						testNode = (testNode.nextSibling!=null) ? testNode.nextSibling : targetNode ;
					}while(testNode.nodeName.indexOf('#text')>-1);
				}
				return testNode;
			},
			// get the previous node without worrying about text nodes
			previousNode : function(node, count){
				testNode = node;
				if(count==null) count = 1;
				// look for the previous html node
				for(var a=0; a<count; a++){
					do {
						testNode = testNode.previousSibling;
						if(testNode==null) testNode = node;
					}while(testNode.nodeName.indexOf('#text')>-1);
				}
				// return it
				return testNode;
			},
			// find the parent node with the given classname
			findParentNode : function(node, rootTag, rootId, rootClass){
				// try parent nodes until you find the one which meets the conditions
				rootFound = false;
				while(!rootFound && node.nodeName!='BODY'){
					rootFound = (rootTag && node.nodeName) ? (node.nodeName.indexOf(rootTag)>-1) : rootFound ;
					rootFound = (rootId && node.id) ? (node.id.indexOf(rootId)>-1) : rootFound ;
					rootFound = (rootClass && node.className) ? (node.className.indexOf(rootClass)>-1) : rootFound ;
					node = (!rootFound) ? node.parentNode : node;
				}
				// pass it back
				return node;
			},
			// gracefully add an event handler
			addEvent : function(node, eventName, eventHandler){
				if('addEventListener' in node){
					node.addEventListener(eventName, eventHandler, false);
				}else if('attachEvent' in node){
					node.attachEvent('on'+eventName, function(event){eventHandler(event)});
				}else{
					node['on'+eventName] = eventHandler;
				}
				return true;
			},
			// trigger an event handler manually
			triggerEvent : function(node, eventName){
				if('fireEvent' in node){
					node.fireEvent('on' + eventName);
				}else if('dispatchEvent' in node){
					var evt = document.createEvent('HTMLEvents');
					evt.initEvent(eventName, false, true);
					node.dispatchEvent(evt);
				}else{
					eval('node.on' + eventName + '()');
				}
				return true;
			},
			// trim whitespace from around a string
			trim : function(string){
				var cu = classBehaviours.utilities;
				return cu.rtrim(cu.ltrim(string));
			},
			ltrim : function(string){
				var left = 0;
				while(left < string.length && string[left] == ' '){
					left++;
				}
				return string.substring(left, string.length);
			},
			rtrim : function(string){
				var right = string.length - 1;
				while(right > 0 && string[right] == ' '){
					right -= 1;
				}
				return string.substring(0, right + 1);
			}
		}