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    <h3>Editing: TranslationExtractorPass.php</h3>
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/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Translation\DependencyInjection;

use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Exception\RuntimeException;
use Symfony\Component\DependencyInjection\Reference;

/**
 * Adds tagged translation.extractor services to translation extractor.
 */
class TranslationExtractorPass implements CompilerPassInterface
{
    public function process(ContainerBuilder $container)
    {
        if (!$container-&gt;hasDefinition('translation.extractor')) {
            return;
        }

        $definition = $container-&gt;getDefinition('translation.extractor');

        foreach ($container-&gt;findTaggedServiceIds('translation.extractor', true) as $id =&gt; $attributes) {
            if (!isset($attributes[0]['alias'])) {
                throw new RuntimeException(sprintf('The alias for the tag &quot;translation.extractor&quot; of service &quot;%s&quot; must be set.', $id));
            }

            $definition-&gt;addMethodCall('addExtractor', [$attributes[0]['alias'], new Reference($id)]);
        }
    }
}
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