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vendor/symfony/framework-bundle/DependencyInjection/Compiler/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\Bundle\FrameworkBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+
+/**
+ * Adds tagged translation.extractor services to translation extractor.
+ */
+class TranslationExtractorPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->hasDefinition('translation.extractor')) {
+            return;
+        }
+
+        $definition = $container->getDefinition('translation.extractor');
+
+        foreach ($container->findTaggedServiceIds('translation.extractor') 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));
+            }
+
+            $definition->addMethodCall('addExtractor', array($attributes[0]['alias'], new Reference($id)));
+        }
+    }
+}