1<?php
2
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 */
11
12namespace Twig\Node\Expression\Test;
13
14use Twig\Compiler;
15use Twig\Node\Expression\TestExpression;
16
17/**
18 * Checks that a variable is null.
19 *
20 *  {{ var is none }}
21 *
22 * @author Fabien Potencier <fabien@symfony.com>
23 */
24class NullTest extends TestExpression
25{
26    public function compile(Compiler $compiler)
27    {
28        $compiler
29            ->raw('(null === ')
30            ->subcompile($this->getNode('node'))
31            ->raw(')')
32        ;
33    }
34}
35
36class_alias('Twig\Node\Expression\Test\NullTest', 'Twig_Node_Expression_Test_Null');
37