vendor/twig/twig/src/Node/Expression/Filter/DefaultFilter.php line 32

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  1. <?php
  3. /*
  4. * This file is part of Twig.
  5. *
  6. * (c) 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. */
  12. namespace Twig\Node\Expression\Filter;
  14. use Twig\Compiler;
  15. use Twig\Node\Expression\ConditionalExpression;
  16. use Twig\Node\Expression\ConstantExpression;
  17. use Twig\Node\Expression\FilterExpression;
  18. use Twig\Node\Expression\GetAttrExpression;
  19. use Twig\Node\Expression\NameExpression;
  20. use Twig\Node\Expression\Test\DefinedTest;
  21. use Twig\Node\Node;
  23. /**
  24. * Returns the value or the default value when it is undefined or empty.
  25. *
  26. * {{ var.foo|default('foo item on var is not defined') }}
  27. *
  28. * @author Fabien Potencier <fabien@symfony.com>
  29. */
  30. class DefaultFilter extends FilterExpression
  31. {
  32. public function __construct(Node $node, ConstantExpression $filterName, Node $arguments, int $lineno, string $tag = null)
  33. {
  34. $default = new FilterExpression($node, new ConstantExpression('default', $node->getTemplateLine()), $arguments, $node->getTemplateLine());
  36. if ('default' === $filterName->getAttribute('value') && ($node instanceof NameExpression || $node instanceof GetAttrExpression)) {
  37. $test = new DefinedTest(clone $node, 'defined', new Node(), $node->getTemplateLine());
  38. $false = \count($arguments) ? $arguments->getNode(0) : new ConstantExpression('', $node->getTemplateLine());
  40. $node = new ConditionalExpression($test, $default, $false, $node->getTemplateLine());
  41. } else {
  42. $node = $default;
  43. }
  45. parent::__construct($node, $filterName, $arguments, $lineno, $tag);
  46. }
  48. public function compile(Compiler $compiler)
  49. {
  50. $compiler->subcompile($this->getNode('node'));
  51. }
  52. }
  54. class_alias('Twig\Node\Expression\Filter\DefaultFilter', 'Twig_Node_Expression_Filter_Default');