/*
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 (line 167)

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