Constant.php

1. 8.x drupal/core/vendor/twig/twig/lib/Twig/Node/Expression/Constant.php
2. 8.x drupal/core/vendor/twig/twig/lib/Twig/Node/Expression/Test/Constant.php

<?php

/*
 * This file is part of Twig.
 *
 * (c) 2011 Fabien Potencier
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Checks if a variable is the exact same value as a constant.
 *
 * <pre>
 *  {% if post.status is constant('Post::PUBLISHED') %}
 *    the status attribute is exactly the same as Post::PUBLISHED
 *  {% endif %}
 * </pre>
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class Twig_Node_Expression_Test_Constant extends Twig_Node_Expression_Test {
  public function compile(Twig_Compiler $compiler) {
    $compiler
      ->raw('(')
      ->subcompile($this
      ->getNode('node'))
      ->raw(' === constant(')
      ->subcompile($this
      ->getNode('arguments')
      ->getNode(0))
      ->raw('))');
  }

}