/*
  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) {
 // 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;
}

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