Viewing file:  DefaultFilter.php (1.75 KB) -rw-r--r--
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<?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.
*/
namespace Twig\Node\Expression\Filter;
use Twig\Compiler;
use Twig\Node\Expression\ConditionalExpression;
use Twig\Node\Expression\ConstantExpression;
use Twig\Node\Expression\FilterExpression;
use Twig\Node\Expression\GetAttrExpression;
use Twig\Node\Expression\NameExpression;
use Twig\Node\Expression\Test\DefinedTest;
use Twig\Node\Node;
/**
* Returns the value or the default value when it is undefined or empty.
*
* {{ var.foo|default('foo item on var is not defined') }}
*
* @author Fabien Potencier <[email protected]>
*/
class DefaultFilter extends FilterExpression
{
public function __construct(Node $node, ConstantExpression $filterName, Node $arguments, int $lineno, string $tag = null)
{
$default = new FilterExpression($node, new ConstantExpression('default', $node->getTemplateLine()), $arguments, $node->getTemplateLine());
if ('default' === $filterName->getAttribute('value') && ($node instanceof NameExpression || $node instanceof GetAttrExpression)) {
$test = new DefinedTest(clone $node, 'defined', new Node(), $node->getTemplateLine());
$false = \count($arguments) ? $arguments->getNode(0) : new ConstantExpression('', $node->getTemplateLine());
$node = new ConditionalExpression($test, $default, $false, $node->getTemplateLine());
} else {
$node = $default;
}
parent::__construct($node, $filterName, $arguments, $lineno, $tag);
}
public function compile(Compiler $compiler): void
{
$compiler->subcompile($this->getNode('node'));
}
}
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