Test.php

<?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 {
  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');
    $testMap = $compiler
      ->getEnvironment()
      ->getTests();
    if (!isset($testMap[$name])) {
      $message = sprintf('The test "%s" does not exist', $name);
      if ($alternatives = $compiler
        ->getEnvironment()
        ->computeAlternatives($name, array_keys($compiler
        ->getEnvironment()
        ->getTests()))) {
        $message = sprintf('%s. Did you mean "%s"', $message, implode('", "', $alternatives));
      }
      throw new Twig_Error_Syntax($message, $this
        ->getLine());
    }
    $name = $this
      ->getAttribute('name');
    $node = $this
      ->getNode('node');
    $compiler
      ->raw($testMap[$name]
      ->compile() . '(')
      ->subcompile($node);
    if (null !== $this
      ->getNode('arguments')) {
      $compiler
        ->raw(', ');
      $max = count($this
        ->getNode('arguments')) - 1;
      foreach ($this
        ->getNode('arguments') as $i => $arg) {
        $compiler
          ->subcompile($arg);
        if ($i != $max) {
          $compiler
            ->raw(', ');
        }
      }
    }
    $compiler
      ->raw(')');
  }

}