SandboxedPrint.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.
 */

/**
 * Twig_Node_SandboxedPrint adds a check for the __toString() method
 * when the variable is an object and the sandbox is activated.
 *
 * When there is a simple Print statement, like {{ article }},
 * and if the sandbox is enabled, we need to check that the __toString()
 * method is allowed if 'article' is an object.
 *
 * @package    twig
 * @author     Fabien Potencier <fabien@symfony.com>
 */
class Twig_Node_SandboxedPrint extends Twig_Node_Print {
  public function __construct(Twig_Node_Expression $expr, $lineno, $tag = null) {
    parent::__construct($expr, $lineno, $tag);
  }

  /**
   * Compiles the node to PHP.
   *
   * @param Twig_Compiler A Twig_Compiler instance
   */
  public function compile(Twig_Compiler $compiler) {
    $compiler
      ->addDebugInfo($this)
      ->write('echo $this->env->getExtension(\'sandbox\')->ensureToStringAllowed(')
      ->subcompile($this
      ->getNode('expr'))
      ->raw(");\n");
  }

  /**
   * Removes node filters.
   *
   * This is mostly needed when another visitor adds filters (like the escaper one).
   *
   * @param Twig_Node $node A Node
   */
  protected function removeNodeFilter($node) {
    if ($node instanceof Twig_Node_Expression_Filter) {
      return $this
        ->removeNodeFilter($node
        ->getNode('node'));
    }
    return $node;
  }

}