/*

   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);


      /* BSJ:
      *
      *	2006-11-27: added this modification to trap out behaviours attached to
      * 	to non-existant elements in the document. This is mainly from dynamically
      *		altering the DOM
      *
      */
      if (!element)
      {
      	return new Array();
      }
      else
      {
	      if (tagName && element.nodeName.toLowerCase() != tagName)
	      {
	        return new Array();
	      }
      }

      /* Old version */
      //if (tagName && element.nodeName.toLowerCase() != tagName)
      //{
      //  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


*/