Test.php

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drupal/core/vendor/twig/twig/lib/Twig/Node/Expression/Test.php
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<?php

/*
 * This file is part of Twig.
 *
 * (c) 2010 Fabien Potencier
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
class Twig_Node_Expression_Test extends Twig_Node_Expression_Call {
  public function __construct(Twig_NodeInterface $node, $name, Twig_NodeInterface $arguments = null, $lineno) {
    parent::__construct(array(
      'node' => $node,
      'arguments' => $arguments,
    ), array(
      'name' => $name,
    ), $lineno);
  }
  public function compile(Twig_Compiler $compiler) {
    $name = $this
      ->getAttribute('name');
    $test = $compiler
      ->getEnvironment()
      ->getTest($name);
    $this
      ->setAttribute('name', $name);
    $this
      ->setAttribute('type', 'test');
    $this
      ->setAttribute('thing', $test);
    if ($test instanceof Twig_TestCallableInterface || $test instanceof Twig_SimpleTest) {
      $this
        ->setAttribute('callable', $test
        ->getCallable());
    }
    $this
      ->compileCallable($compiler);
  }

}

Classes