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Edit File: ExpressionLanguage.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\DependencyInjection;

use Symfony\Component\ExpressionLanguage\ExpressionLanguage as BaseExpressionLanguage;

/**
 * Adds some function to the default ExpressionLanguage.
 *
 * To get a service, use service('request').
 * To get a parameter, use parameter('kernel.debug').
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class ExpressionLanguage extends BaseExpressionLanguage
{
    protected function registerFunctions()
    {
        parent::registerFunctions();

$this->register('service', function ($arg) {
            return sprintf('$this->get(%s)', $arg);
        }, function (array $variables, $value) {
            return $variables['container']->get($value);
        });

$this->register('parameter', function ($arg) {
            return sprintf('$this->getParameter(%s)', $arg);
        }, function (array $variables, $value) {
            return $variables['container']->getParameter($value);
        });
    }
}

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