CheckToStringNode.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;

use Twig\Attribute\YieldReady;
use Twig\Compiler;
use Twig\Node\Expression\AbstractExpression;

/**
 * Checks if casting an expression to __toString() is allowed by the sandbox.
 *
 * For instance, when there is a simple Print statement, like {{ article }},
 * and if the sandbox is enabled, we need to check that the __toString()
 * method is allowed if 'article' is an object. The same goes for {{ article|upper }}
 * or {{ random(article) }}
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class CheckToStringNode extends AbstractExpression {
    public function __construct(AbstractExpression $expr) {
        parent::__construct([
            'expr' => $expr,
        ], [], $expr->getTemplateLine());
    }
    public function compile(Compiler $compiler) : void {
        $expr = $this->getNode('expr');
        $compiler->raw('$this->sandbox->ensureToStringAllowed(')
            ->subcompile($expr)
            ->raw(', ')
            ->repr($expr->getTemplateLine())
            ->raw(', $this->source)');
    }

}