lib/lessphp/Autoloader.php

   1 <?php
   2
   3 /**
   4  * Autoloader
   5  *
   6  * @package Less
   7  * @subpackage autoload
   8  */
   9 class Less_Autoloader {
  10
  11         /**
  12          * Registered flag
  13          *
  14          * @var boolean
  15          */
  16         protected static $registered = false;
  17
  18         /**
  19          * Library directory
  20          *
  21          * @var string
  22          */
  23         protected static $libDir;
  24
  25         /**
  26          * Register the autoloader in the spl autoloader
  27          *
  28          * @return void
  29          * @throws Exception If there was an error in registration
  30          */
  31         public static function register(){
  32                 if( self::$registered ){
  33                         return;
  34                 }
  35
  36                 self::$libDir = dirname(__FILE__);
  37
  38                 if(false === spl_autoload_register(array('Less_Autoloader', 'loadClass'))){
  39                         throw new Exception('Unable to register Less_Autoloader::loadClass as an autoloading method.');
  40                 }
  41
  42                 self::$registered = true;
  43         }
  44
  45         /**
  46          * Unregisters the autoloader
  47          *
  48          * @return void
  49          */
  50         public static function unregister(){
  51                 spl_autoload_unregister(array('Less_Autoloader', 'loadClass'));
  52                 self::$registered = false;
  53         }
  54
  55         /**
  56          * Loads the class
  57          *
  58          * @param string $className The class to load
  59          */
  60         public static function loadClass($className){
  61
  62
  63                 // handle only package classes
  64                 if(strpos($className, 'Less_') !== 0){
  65                         return;
  66                 }
  67
  68                 $className = substr($className,5);
  69                 $fileName = self::$libDir . DIRECTORY_SEPARATOR . str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';
  70
  71                 if(file_exists($fileName)){
  72                         require $fileName;
  73                         return true;
  74                 }else{
  75                         throw new Exception('file not loadable '.$fileName);
  76                 }
  77         }
  78
  79 }