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Filename : TranslationExtractorPass.php
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<?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\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
{
    private $extractorServiceId;
    private $extractorTag;

    public function __construct(string $extractorServiceId = 'translation.extractor', string $extractorTag = 'translation.extractor')
    {
        if (0 < \func_num_args()) {
            trigger_deprecation('symfony/translation', '5.3', 'Configuring "%s" is deprecated.', __CLASS__);
        }

        $this->extractorServiceId = $extractorServiceId;
        $this->extractorTag = $extractorTag;
    }

    public function process(ContainerBuilder $container)
    {
        if (!$container->hasDefinition($this->extractorServiceId)) {
            return;
        }

        $definition = $container->getDefinition($this->extractorServiceId);

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

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