DebugClassLoader.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Symfony\Component\ClassLoader;


/**
 * Autoloader checking if the class is really defined in the file found.
 *
 * The DebugClassLoader will wrap all registered autoloaders providing a
 * findFile method and will throw an exception if a file is found but does
 * not declare the class.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Christophe Coevoet <stof@notk.org>
 *
 * @api
 */
class DebugClassLoader {
  private $classFinder;

  /**
   * Constructor.
   *
   * @param object $classFinder
   *
   * @api
   */
  public function __construct($classFinder) {
    $this->classFinder = $classFinder;
  }

  /**
   * Replaces all autoloaders implementing a findFile method by a DebugClassLoader wrapper.
   */
  public static function enable() {
    if (!is_array($functions = spl_autoload_functions())) {
      return;
    }
    foreach ($functions as $function) {
      spl_autoload_unregister($function);
    }
    foreach ($functions as $function) {
      if (is_array($function) && method_exists($function[0], 'findFile')) {
        $function = array(
          new static($function[0]),
          'loadClass',
        );
      }
      spl_autoload_register($function);
    }
  }

  /**
   * Unregisters this instance as an autoloader.
   */
  public function unregister() {
    spl_autoload_unregister(array(
      $this,
      'loadClass',
    ));
  }

  /**
   * Loads the given class or interface.
   *
   * @param string $class The name of the class
   *
   * @return Boolean|null True, if loaded
   */
  public function loadClass($class) {
    if ($file = $this->classFinder
      ->findFile($class)) {
      require $file;
      if (!class_exists($class, false) && !interface_exists($class, false) && (!function_exists('trait_exists') || !trait_exists($class, false))) {
        throw new \RuntimeException(sprintf('The autoloader expected class "%s" to be defined in file "%s". The file was found but the class was not in it, the class name or namespace probably has a typo.', $class, $file));
      }
      return true;
    }
  }

}