--- /dev/null
+<?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\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\ConfigurationExtensionInterface;
+use Symfony\Component\DependencyInjection\Extension\PrependExtensionInterface;
+
+/**
+ * Merges extension configs into the container builder.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class MergeExtensionConfigurationPass implements CompilerPassInterface
+{
+ /**
+ * {@inheritdoc}
+ */
+ public function process(ContainerBuilder $container)
+ {
+ $parameters = $container->getParameterBag()->all();
+ $definitions = $container->getDefinitions();
+ $aliases = $container->getAliases();
+ $exprLangProviders = $container->getExpressionLanguageProviders();
+
+ foreach ($container->getExtensions() as $extension) {
+ if ($extension instanceof PrependExtensionInterface) {
+ $extension->prepend($container);
+ }
+ }
+
+ foreach ($container->getExtensions() as $name => $extension) {
+ if (!$config = $container->getExtensionConfig($name)) {
+ // this extension was not called
+ continue;
+ }
+ $config = $container->getParameterBag()->resolveValue($config);
+
+ $tmpContainer = new ContainerBuilder($container->getParameterBag());
+ $tmpContainer->setResourceTracking($container->isTrackingResources());
+ $tmpContainer->addObjectResource($extension);
+ if ($extension instanceof ConfigurationExtensionInterface && null !== $configuration = $extension->getConfiguration($config, $tmpContainer)) {
+ $tmpContainer->addObjectResource($configuration);
+ }
+
+ foreach ($exprLangProviders as $provider) {
+ $tmpContainer->addExpressionLanguageProvider($provider);
+ }
+
+ $extension->load($config, $tmpContainer);
+
+ $container->merge($tmpContainer);
+ $container->getParameterBag()->add($parameters);
+ }
+
+ $container->addDefinitions($definitions);
+ $container->addAliases($aliases);
+ }
+}