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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   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  namespace Symfony\Component\CssSelector\Parser\Shortcut;
  13  
  14  use Symfony\Component\CssSelector\Node\ElementNode;
  15  use Symfony\Component\CssSelector\Node\SelectorNode;
  16  use Symfony\Component\CssSelector\Parser\ParserInterface;
  17  
  18  /**
  19   * CSS selector class parser shortcut.
  20   *
  21   * This shortcut ensure compatibility with previous version.
  22   * - The parser fails to parse an empty string.
  23   * - In the previous version, an empty string matches each tags.
  24   *
  25   * This component is a port of the Python cssselect library,
  26   * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  27   *
  28   * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
  29   *
  30   * @internal
  31   */
  32  class EmptyStringParser implements ParserInterface
  33  {
  34      /**
  35       * {@inheritdoc}
  36       */
  37      public function parse(string $source): array
  38      {
  39          // Matches an empty string
  40          if ('' == $source) {
  41              return [new SelectorNode(new ElementNode(null, '*'))];
  42          }
  43  
  44          return [];
  45      }
  46  }