inc/Twig/Node/Expression/Filter/Default.php

   1 <?php
   2
   3 /*
   4  * This file is part of Twig.
   5  *
   6  * (c) 2011 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 /**
  13  * Returns the value or the default value when it is undefined or empty.
  14  *
  15  * <pre>
  16  *  {{ var.foo|default('foo item on var is not defined') }}
  17  * </pre>
  18  *
  19  * @author Fabien Potencier <fabien@symfony.com>
  20  */
  21 class Twig_Node_Expression_Filter_Default extends Twig_Node_Expression_Filter
  22 {
  23     public function __construct(Twig_NodeInterface $node, Twig_Node_Expression_Constant $filterName, Twig_NodeInterface $arguments, $lineno, $tag = null)
  24     {
  25         $default = new Twig_Node_Expression_Filter($node, new Twig_Node_Expression_Constant('default', $node->getLine()), $arguments, $node->getLine());
  26
  27         if ('default' === $filterName->getAttribute('value') && ($node instanceof Twig_Node_Expression_Name || $node instanceof Twig_Node_Expression_GetAttr)) {
  28             $test = new Twig_Node_Expression_Test_Defined(clone $node, 'defined', new Twig_Node(), $node->getLine());
  29             $false = count($arguments) ? $arguments->getNode(0) : new Twig_Node_Expression_Constant('', $node->getLine());
  30
  31             $node = new Twig_Node_Expression_Conditional($test, $default, $false, $node->getLine());
  32         } else {
  33             $node = $default;
  34         }
  35
  36         parent::__construct($node, $filterName, $arguments, $lineno, $tag);
  37     }
  38
  39     public function compile(Twig_Compiler $compiler)
  40     {
  41         $compiler->subcompile($this->getNode('node'));
  42     }
  43 }