// Controller Page
// This is the behaviour.js page
// It allows javascript to take place within html

// Creates variables:
// Behaviour
//
// Contains functions:
// getAllChildren
// getElementsBySelector

/*
	Uses css selectors to apply javascript behaviours to enable unobtrusive javascript in html documents.
   	
	Usage: 
	var myrules = {
		'b.someclass' : function(element){
			element.onclick = function(){
				alert(this.innerHTML);
			}
		},
		'#someid u' : function(element){
			element.onmouseover = function(){
				this.innerHTML = "BLAH!";
			}
		}
	};
	
	Behaviour.register(myrules);
	
	// Call Behaviour.apply() to re-apply the rules (if you update the dom, etc).
   	http://ripcord.co.nz/behaviour/
*/

/*
   document.getElementsBySelector(selector)
   - returns an array of element objects from the current document
     matching the CSS selector. Selectors can contain element names, 
     class names and ids and can be nested. For example:
     
     elements = document.getElementsBySelect('div#main p a.external')
     
     Will return an array of all 'a' elements with 'external' in their 
     class attribute that are contained inside 'p' elements that are 
     contained inside the 'div' element which has id="main"

   New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
   See http://www.w3.org/TR/css3-selectors/#attribute-selectors

   Version 0.4 - Simon Willison, March 25th 2003
   -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
   -- Opera 7 fails 
*/

var Behaviour = {
	list : new Array,
	
	register : function(sheet){
		Behaviour.list.push(sheet);
	},
	
	start : function(){
		Behaviour.addLoadEvent(function(){
			Behaviour.apply();
		});
	},
	
	apply : function(){
		for(h=0; sheet = Behaviour.list[h]; h++){
			for(selector in sheet){
				
				list = document.getElementsBySelector(selector);
				
				if (!list){
					continue;
				}

				for (i=0; element = list[i]; i++){
					sheet[selector](element);
				}
			}
		}
	},
	
	addLoadEvent : function(func){
		var oldonload = window.onload;
		
		if (typeof window.onload != 'function') {
			window.onload = func;
		}
		else{
			window.onload = function() {
				oldonload();
				func();
			}
		}
	}
}
Behaviour.start();

/************************************************************/

function getAllChildren(e) {
	// Returns all children of element. Workaround required for IE5/Windows. Ugh.
	return e.all ? e.all : e.getElementsByTagName('*');
}

document.getElementsBySelector = function(selector) {
	// Attempt to fail gracefully in lesser browsers
	if (!document.getElementsByTagName){
		return new Array();
	}

	// Split selector into tokens
	var tokens = selector.split(' ');
	var currentContext = new Array(document);
	
	for(var i = 0; i < tokens.length; i++){
		token = tokens[i].replace(/^\s+/,'').replace(/\s+$/,'');;
	
		if (token.indexOf('#') > -1){
	  		// Token is an ID selector
	  		var bits = token.split('#');
	  		var tagName = bits[0];
	  		var id = bits[1];
	  		var element = document.getElementById(id);
	  
			if(tagName && element.nodeName.toLowerCase() != tagName){
				// tag with that ID not found, return false
				return new Array();
			}
		
	  		// Set currentContext to contain just this element
	  		currentContext = new Array(element);
	  		continue; // Skip to next token
		}
		if (token.indexOf('.') > -1) {
	  		// Token contains a class selector
	  		var bits = token.split('.');
	  		var tagName = bits[0];
	  		var className = bits[1];
	  		if (!tagName) {
				tagName = '*';
	  		}
	  		// Get elements matching tag, filter them for class selector
	  		var found = new Array;
	  		var foundCount = 0;
			
			for (var h = 0; h < currentContext.length; h++){
				var elements;
				if (tagName == '*') {
					elements = getAllChildren(currentContext[h]);
				}
				else{
					elements = currentContext[h].getElementsByTagName(tagName);
				}
			
				for (var j = 0; j < elements.length; j++){
		  			found[foundCount++] = elements[j];
				}
	  		}
	  		
			currentContext = new Array;
			var currentContextIndex = 0;
			
			for (var k = 0; k < found.length; k++){
				if (found[k].className && found[k].className.match(new RegExp('\\b'+className+'\\b'))) {
					currentContext[currentContextIndex++] = found[k];
				}
			}
			continue; // Skip to next token
		}
		// Code to deal with attribute selectors
		if (token.match(/^(\w*)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/)){
			var tagName = RegExp.$1;
			var attrName = RegExp.$2;
			var attrOperator = RegExp.$3;
			var attrValue = RegExp.$4;
			
			if (!tagName) {
				tagName = '*';
			}
			
			// Grab all of the tagName elements within current context
			var found = new Array;
			var foundCount = 0;
			
			for (var h = 0; h < currentContext.length; h++){
				var elements;
				
				if (tagName == '*') {
					elements = getAllChildren(currentContext[h]);
				}
				else {
					elements = currentContext[h].getElementsByTagName(tagName);
				}
				
				for (var j = 0; j < elements.length; j++){
			  		found[foundCount++] = elements[j];
				}
			}
			
			currentContext = new Array;
			var currentContextIndex = 0;
			var checkFunction; // This function will be used to filter the elements
			
			switch (attrOperator){
				case '=': // Equality
					checkFunction = function(e){ return (e.getAttribute(attrName) == attrValue); };
					break;
				case '~': // Match one of space seperated words 
					checkFunction = function(e){ return (e.getAttribute(attrName).match(new RegExp('\\b'+attrValue+'\\b'))); };
					break;
				case '|': // Match start with value followed by optional hyphen
					checkFunction = function(e){ return (e.getAttribute(attrName).match(new RegExp('^'+attrValue+'-?'))); };
					break;
				case '^': // Match starts with value
					checkFunction = function(e){ return (e.getAttribute(attrName).indexOf(attrValue) == 0); };
					break;
				case '$': // Match ends with value - fails with "Warning" in Opera 7
					checkFunction = function(e){ return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length); };
					break;
				case '*': // Match ends with value
					checkFunction = function(e){ return (e.getAttribute(attrName).indexOf(attrValue) > -1); };
					break;
				default :
					// Just test for existence of attribute
					checkFunction = function(e) { return e.getAttribute(attrName); };
			}
			
			currentContext = new Array;
			var currentContextIndex = 0;
			
			for (var k = 0; k < found.length; k++){
				if (checkFunction(found[k])){
					currentContext[currentContextIndex++] = found[k];
				}
			}
			// alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
			continue; // Skip to next token
		}
	
		if(!currentContext[0]){
			return;
		}
	
		// If we get here, token is JUST an element (not a class or ID selector)
		tagName = token;
		var found = new Array;
		var foundCount = 0;
		
		for (var h = 0; h < currentContext.length; h++){
			
			var elements = currentContext[h].getElementsByTagName(tagName);
			
			for (var j = 0; j < elements.length; j++){
				found[foundCount++] = elements[j];
			}
		}
		currentContext = found;
	}
	return currentContext;
}

/* That revolting regular expression explained 
/^(\w+)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/
  \---/  \---/\-------------/    \-------/
    |      |         |               |
    |      |         |           The value
    |      |    ~,|,^,$,* or =
    |   Attribute 
   Tag
*/