Syntax highlighting.

sh/src/shAutoloader.js

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+/**
+ * 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);
+	};
+};
+
+})();