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   1  <?php
   2  
   3  /*
   4   * This file is part of Twig.
   5   *
   6   * (c) 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  namespace Twig\Node\Expression\Test;
  13  
  14  use Twig\Compiler;
  15  use Twig\Node\Expression\TestExpression;
  16  
  17  /**
  18   * Checks that a variable is null.
  19   *
  20   *  {{ var is none }}
  21   *
  22   * @author Fabien Potencier <fabien@symfony.com>
  23   */
  24  class NullTest extends TestExpression
  25  {
  26      public function compile(Compiler $compiler)
  27      {
  28          $compiler
  29              ->raw('(null === ')
  30              ->subcompile($this->getNode('node'))
  31              ->raw(')')
  32          ;
  33      }
  34  }
  35  
  36  class_alias('Twig\Node\Expression\Test\NullTest', 'Twig_Node_Expression_Test_Null');