MDL-44357 theme: Allow core to compile LESS in PHP

lib/lessphp/Autoloader.php

@@ -0,0 +1,79 @@
+<?php
+
+/**
+ * Autoloader
+ *
+ * @package Less
+ * @subpackage autoload
+ */
+class Less_Autoloader {
+
+	/**
+	 * Registered flag
+	 *
+	 * @var boolean
+	 */
+	protected static $registered = false;
+
+	/**
+	 * Library directory
+	 *
+	 * @var string
+	 */
+	protected static $libDir;
+
+	/**
+	 * Register the autoloader in the spl autoloader
+	 *
+	 * @return void
+	 * @throws Exception If there was an error in registration
+	 */
+	public static function register(){
+		if( self::$registered ){
+			return;
+		}
+
+		self::$libDir = dirname(__FILE__);
+
+		if(false === spl_autoload_register(array('Less_Autoloader', 'loadClass'))){
+			throw new Exception('Unable to register Less_Autoloader::loadClass as an autoloading method.');
+		}
+
+		self::$registered = true;
+	}
+
+	/**
+	 * Unregisters the autoloader
+	 *
+	 * @return void
+	 */
+	public static function unregister(){
+		spl_autoload_unregister(array('Less_Autoloader', 'loadClass'));
+		self::$registered = false;
+	}
+
+	/**
+	 * Loads the class
+	 *
+	 * @param string $className The class to load
+	 */
+	public static function loadClass($className){
+
+
+		// handle only package classes
+		if(strpos($className, 'Less_') !== 0){
+			return;
+		}
+
+		$className = substr($className,5);
+		$fileName = self::$libDir . DIRECTORY_SEPARATOR . str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';
+
+		if(file_exists($fileName)){
+			require $fileName;
+			return true;
+		}else{
+			throw new Exception('file not loadable '.$fileName);
+		}
+	}
+
+}