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mobile/source/ext/phptal/PHPTAL/TalesRegistry.php 3.23 KB
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  <?php
  /**
   * PHPTAL templating engine
   *
   * PHP Version 5
   *
   * @category HTML
   * @package  PHPTAL
   * @author   Laurent Bedubourg <lbedubourg@motion-twin.com>
   * @author   Kornel LesiƄski <kornel@aardvarkmedia.co.uk>
   * @license  http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License
   * @version  SVN: $Id: TalesRegistry.php 610 2009-05-24 00:32:13Z kornel $
   * @link     http://phptal.org/
   */
  
  /**
   * Global registry of TALES expression modifiers
   *
   * @package PHPTAL
   * @subpackage Php
   */
  class PHPTAL_TalesRegistry
  {
      private static $instance;
  
      /**
       * This is a singleton
       *
       * @return PHPTAL_TalesRegistry
       */
      static public function getInstance()
      {
          if (!self::$instance) {
              self::$instance = new PHPTAL_TalesRegistry();
          }
  
          return self::$instance;
      }
  
      protected function __construct()
      {       
          $this->registerPrefix('not', array('PHPTAL_Php_TalesInternal', 'not'));
          $this->registerPrefix('path', array('PHPTAL_Php_TalesInternal', 'path'));
          $this->registerPrefix('string', array('PHPTAL_Php_TalesInternal', 'string'));
          $this->registerPrefix('php', array('PHPTAL_Php_TalesInternal', 'php'));
          $this->registerPrefix('exists', array('PHPTAL_Php_TalesInternal', 'exists'));
          $this->registerPrefix('number', array('PHPTAL_Php_TalesInternal', 'number'));
          $this->registerPrefix('true', array('PHPTAL_Php_TalesInternal', 'true'));
      }
  
      /**
       *
       * Expects an either a function name or an array of class and method as
       * callback.
       *
       * @param string $prefix
       * @param mixed $callback
       */
      public function registerPrefix($prefix, $callback)
      {
          if ($this->isRegistered($prefix)) {
              throw new PHPTAL_ConfigurationException("Expression modifier '$prefix' is already registered");
          }
  
          // Check if valid callback
  
          if (is_array($callback)) {
  
              $class = new ReflectionClass($callback[0]);
  
              if (!$class->isSubclassOf('PHPTAL_Tales')) {
                  throw new PHPTAL_ConfigurationException('The class you want to register does not implement "PHPTAL_Tales".');
              }
  
              $method = new ReflectionMethod($callback[0], $callback[1]);
  
              if (!$method->isStatic()) {
                  throw new PHPTAL_ConfigurationException('The method you want to register is not static.');
              }
  
              // maybe we want to check the parameters the method takes
  
          } else {
              if (!function_exists($callback)) {
                  throw new PHPTAL_ConfigurationException('The function you are trying to register does not exist.');
              }
          }
  
  
          $this->_callbacks[$prefix] = $callback;
      }
  
      /**
       * true if given prefix is taken
       */
      public function isRegistered($prefix)
      {
          return (array_key_exists($prefix, $this->_callbacks));
      }
  
      /**
       * get callback for the prefix
       */
      public function getCallback($prefix)
      {
          if (!$this->isRegistered($prefix)) {
              throw new PHPTAL_ConfigurationException("Expression modifier '$prefix' is not registered");
          }
          return $this->_callbacks[$prefix];
      }
  
      private $_callbacks = array();
  }
  
  ?>