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vendor/symfony/http-kernel/DependencyInjection/RegisterLocaleAwareServicesPass.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\HttpKernel\DependencyInjection;
+
+use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * Register all services that have the "kernel.locale_aware" tag into the listener.
+ *
+ * @author Pierre Bobiet <pierrebobiet@gmail.com>
+ */
+class RegisterLocaleAwareServicesPass implements CompilerPassInterface
+{
+    /**
+     * @return void
+     */
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->hasDefinition('locale_aware_listener')) {
+            return;
+        }
+
+        $services = [];
+
+        foreach ($container->findTaggedServiceIds('kernel.locale_aware') as $id => $tags) {
+            $services[] = new Reference($id);
+        }
+
+        if (!$services) {
+            $container->removeDefinition('locale_aware_listener');
+
+            return;
+        }
+
+        $container
+            ->getDefinition('locale_aware_listener')
+            ->setArgument(0, new IteratorArgument($services))
+        ;
+    }
+}