--- /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\Alias;
+use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+/**
+ * Replaces all references to aliases with references to the actual service.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class ResolveReferencesToAliasesPass implements CompilerPassInterface
+{
+ private $container;
+
+ /**
+ * Processes the ContainerBuilder to replace references to aliases with actual service references.
+ *
+ * @param ContainerBuilder $container
+ */
+ public function process(ContainerBuilder $container)
+ {
+ $this->container = $container;
+
+ foreach ($container->getDefinitions() as $definition) {
+ if ($definition->isSynthetic() || $definition->isAbstract()) {
+ continue;
+ }
+
+ $definition->setArguments($this->processArguments($definition->getArguments()));
+ $definition->setMethodCalls($this->processArguments($definition->getMethodCalls()));
+ $definition->setProperties($this->processArguments($definition->getProperties()));
+ $definition->setFactory($this->processFactory($definition->getFactory()));
+ $definition->setFactoryService($this->processFactoryService($definition->getFactoryService(false)), false);
+ }
+
+ foreach ($container->getAliases() as $id => $alias) {
+ $aliasId = (string) $alias;
+ if ($aliasId !== $defId = $this->getDefinitionId($aliasId)) {
+ $container->setAlias($id, new Alias($defId, $alias->isPublic()));
+ }
+ }
+ }
+
+ /**
+ * Processes the arguments to replace aliases.
+ *
+ * @param array $arguments An array of References
+ *
+ * @return array An array of References
+ */
+ private function processArguments(array $arguments)
+ {
+ foreach ($arguments as $k => $argument) {
+ if (is_array($argument)) {
+ $arguments[$k] = $this->processArguments($argument);
+ } elseif ($argument instanceof Reference) {
+ $defId = $this->getDefinitionId($id = (string) $argument);
+
+ if ($defId !== $id) {
+ $arguments[$k] = new Reference($defId, $argument->getInvalidBehavior(), $argument->isStrict(false));
+ }
+ }
+ }
+
+ return $arguments;
+ }
+
+ private function processFactoryService($factoryService)
+ {
+ if (null === $factoryService) {
+ return;
+ }
+
+ return $this->getDefinitionId($factoryService);
+ }
+
+ private function processFactory($factory)
+ {
+ if (null === $factory || !is_array($factory) || !$factory[0] instanceof Reference) {
+ return $factory;
+ }
+
+ $defId = $this->getDefinitionId($id = (string) $factory[0]);
+
+ if ($defId !== $id) {
+ $factory[0] = new Reference($defId, $factory[0]->getInvalidBehavior(), $factory[0]->isStrict(false));
+ }
+
+ return $factory;
+ }
+
+ /**
+ * Resolves an alias into a definition id.
+ *
+ * @param string $id The definition or alias id to resolve
+ *
+ * @return string The definition id with aliases resolved
+ */
+ private function getDefinitionId($id)
+ {
+ $seen = array();
+ while ($this->container->hasAlias($id)) {
+ if (isset($seen[$id])) {
+ throw new ServiceCircularReferenceException($id, array_keys($seen));
+ }
+ $seen[$id] = true;
+ $id = (string) $this->container->getAlias($id);
+ }
+
+ return $id;
+ }
+}