ConstantTest.php

<?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\Test;

use Twig\Compiler;
use Twig\Node\Expression\TestExpression;

/**
 * Checks if a variable is the exact same value as a constant.
 *
 *    {% if post.status is constant('Post::PUBLISHED') %}
 *      the status attribute is exactly the same as Post::PUBLISHED
 *    {% endif %}
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class ConstantTest extends TestExpression {
    public function compile(Compiler $compiler) : void {
        $compiler->raw('(')
            ->subcompile($this->getNode('node'))
            ->raw(' === constant(');
        if ($this->getNode('arguments')
            ->hasNode('1')) {
            $compiler->raw('get_class(')
                ->subcompile($this->getNode('arguments')
                ->getNode('1'))
                ->raw(')."::".');
        }
        $compiler->subcompile($this->getNode('arguments')
            ->getNode('0'))
            ->raw('))');
    }

}