<?php

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

/**
 * Returns the value or the default value when it is undefined or empty.
 *
 * <pre>
 *  {{ var.foo|default('foo item on var is not defined') }}
 * </pre>
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class Twig_SupTwgDtgs_Node_Expression_Filter_Default extends Twig_SupTwgDtgs_Node_Expression_Filter
{
  public function __construct(Twig_SupTwgDtgs_NodeInterface $node, Twig_SupTwgDtgs_Node_Expression_Constant $filterName, Twig_SupTwgDtgs_NodeInterface $arguments, $lineno, $tag = null)
  {
    $default = new Twig_SupTwgDtgs_Node_Expression_Filter($node, new Twig_SupTwgDtgs_Node_Expression_Constant('default', $node->getTemplateLine()), $arguments, $node->getTemplateLine());

    if ('default' === $filterName->getAttribute('value') && ($node instanceof Twig_SupTwgDtgs_Node_Expression_Name || $node instanceof Twig_SupTwgDtgs_Node_Expression_GetAttr)) {
      $test = new Twig_SupTwgDtgs_Node_Expression_Test_Defined(clone $node, 'defined', new Twig_SupTwgDtgs_Node(), $node->getTemplateLine());
      $false = count($arguments) ? $arguments->getNode(0) : new Twig_SupTwgDtgs_Node_Expression_Constant('', $node->getTemplateLine());

      $node = new Twig_SupTwgDtgs_Node_Expression_Conditional($test, $default, $false, $node->getTemplateLine());
    } else {
      $node = $default;
    }

    parent::__construct($node, $filterName, $arguments, $lineno, $tag);
  }

  public function compile(Twig_SupTwgDtgs_Compiler $compiler)
  {
    $compiler->subcompile($this->getNode('node'));
  }
}
