/*
   Behaviour v1.1 by Ben Nolan, June 2005. Based largely on the work
   of Simon Willison (see comments by Simon below).

   Description:
   	
   	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).

   License:
   
   	This file is entirely BSD licensed.
   	
   More information:
   	
   	http://ripcord.co.nz/behaviour/
   
*/   

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();

/*
   The following code is Copyright (C) Simon Willison 2004.

   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 
*/

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) {
	try {
		  // Attempt to fail gracefully in lesser browsers
		  if (!document.getElementsByTagName) {
			return new Array();
		  }
		  // Split selector in to 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;
	} catch (e) {
		return false;	
	}
}

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