source: tol/TolJava/WebTOLJavaDEMO/web/sh/src/shAutoloader.js

/**
 * SyntaxHighlighter
 * http://alexgorbatchev.com/SyntaxHighlighter
 *
 * SyntaxHighlighter is donationware. If you are using it, please donate.
 * http://alexgorbatchev.com/SyntaxHighlighter/donate.html
 *
 * @version
 * 3.0.83 (July 02 2010)
 * 
 * @copyright
 * Copyright (C) 2004-2010 Alex Gorbatchev.
 *
 * @license
 * Dual licensed under the MIT and GPL licenses.
 */
(function() {

var sh = SyntaxHighlighter;

/**
 * Provides functionality to dynamically load only the brushes that a needed to render the current page.
 *
 * There are two syntaxes that autoload understands. For example:
 * 
 * SyntaxHighlighter.autoloader(
 *     [ 'applescript',          'Scripts/shBrushAppleScript.js' ],
 *     [ 'actionscript3', 'as3', 'Scripts/shBrushAS3.js' ]
 * );
 *
 * or a more easily comprehendable one:
 *
 * SyntaxHighlighter.autoloader(
 *     'applescript       Scripts/shBrushAppleScript.js',
 *     'actionscript3 as3 Scripts/shBrushAS3.js'
 * );
 */
sh.autoloader = function()
{
        var list = arguments,
                elements = sh.findElements(),
                brushes = {},
                scripts = {},
                all = SyntaxHighlighter.all,
                allCalled = false,
                allParams = null,
                i
                ;
                
        SyntaxHighlighter.all = function(params)
        {
                allParams = params;
                allCalled = true;
        };
        
        function addBrush(aliases, url)
        {
                for (var i = 0; i < aliases.length; i++)
                        brushes[aliases[i]] = url;
        };
        
        function getAliases(item)
        {
                return item.pop
                        ? item
                        : item.split(/\s+/)
                        ;
        }
        
        // create table of aliases and script urls
        for (i = 0; i < list.length; i++)
        {
                var aliases = getAliases(list[i]),
                        url = aliases.pop()
                        ;
                        
                addBrush(aliases, url);
        }
        
        // dynamically add <script /> tags to the document body
        for (i = 0; i < elements.length; i++)
        {
                var url = brushes[elements[i].params.brush];
                
                if (!url)
                        continue;
                
                scripts[url] = false;
                loadScript(url);
        }
        
        function loadScript(url)
        {
                var script = document.createElement('script'),
                        done = false
                        ;
                
                script.src = url;
                script.type = 'text/javascript';
                script.language = 'javascript';
                script.onload = script.onreadystatechange = function()
                {
                        if (!done && (!this.readyState || this.readyState == 'loaded' || this.readyState == 'complete'))
                        {
                                done = true;
                                scripts[url] = true;
                                checkAll();
                                
                                // Handle memory leak in IE
                                script.onload = script.onreadystatechange = null;
                                script.parentNode.removeChild(script);
                        }
                };
                
                // sync way of adding script tags to the page
                document.body.appendChild(script);
        };
        
        function checkAll()
        {
                for(var url in scripts)
                        if (scripts[url] == false)
                                return;
                
                if (allCalled)
                        SyntaxHighlighter.highlight(allParams);
        };
};

})();