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   1  <?php
   2  
   3  /*
   4   * This file is part of Twig.
   5   *
   6   * (c) 2015 Fabien Potencier
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  /**
  13   * Default autoescaping strategy based on file names.
  14   *
  15   * This strategy sets the HTML as the default autoescaping strategy,
  16   * but changes it based on the filename.
  17   *
  18   * Note that there is no runtime performance impact as the
  19   * default autoescaping strategy is set at compilation time.
  20   *
  21   * @author Fabien Potencier <fabien@symfony.com>
  22   */
  23  class Twig_FileExtensionEscapingStrategy
  24  {
  25      /**
  26       * Guesses the best autoescaping strategy based on the file name.
  27       *
  28       * @param string $filename The template file name
  29       *
  30       * @return string|false The escaping strategy name to use or false to disable
  31       */
  32      public static function guess($filename)
  33      {
  34          if (in_array(substr($filename, -1), array('/', '\\'))) {
  35              return 'html'; // return html for directories
  36          }
  37  
  38          if ('.twig' === substr($filename, -5)) {
  39              $filename = substr($filename, 0, -5);
  40          }
  41  
  42          $extension = pathinfo($filename, PATHINFO_EXTENSION);
  43  
  44          switch ($extension) {
  45              case 'js':
  46                  return 'js';
  47  
  48              case 'css':
  49                  return 'css';
  50  
  51              case 'txt':
  52                  return false;
  53  
  54              default:
  55                  return 'html';
  56          }
  57      }
  58  }