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vendor/symfony/twig-bundle/DependencyInjection/Compiler/TwigEnvironmentPass.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\TwigBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+
+/**
+ * Adds tagged twig.extension services to twig service.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class TwigEnvironmentPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container)
+    {
+        if (false === $container->hasDefinition('twig')) {
+            return;
+        }
+
+        $definition = $container->getDefinition('twig');
+
+        // Extensions must always be registered before everything else.
+        // For instance, global variable definitions must be registered
+        // afterward. If not, the globals from the extensions will never
+        // be registered.
+        $calls = $definition->getMethodCalls();
+        $definition->setMethodCalls(array());
+        foreach ($container->findTaggedServiceIds('twig.extension') as $id => $attributes) {
+            $definition->addMethodCall('addExtension', array(new Reference($id)));
+        }
+        $definition->setMethodCalls(array_merge($definition->getMethodCalls(), $calls));
+    }
+}