Chris@0: <?php
Chris@0: 
Chris@0: /*
Chris@0:  * This file is part of the Symfony package.
Chris@0:  *
Chris@0:  * (c) Fabien Potencier <fabien@symfony.com>
Chris@0:  *
Chris@0:  * For the full copyright and license information, please view the LICENSE
Chris@0:  * file that was distributed with this source code.
Chris@0:  */
Chris@0: 
Chris@0: namespace Symfony\Component\DependencyInjection\Compiler;
Chris@0: 
Chris@0: use Symfony\Component\DependencyInjection\Alias;
Chris@0: use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
Chris@0: use Symfony\Component\DependencyInjection\Reference;
Chris@0: use Symfony\Component\DependencyInjection\ContainerBuilder;
Chris@0: 
Chris@0: /**
Chris@0:  * Replaces all references to aliases with references to the actual service.
Chris@0:  *
Chris@0:  * @author Johannes M. Schmitt <schmittjoh@gmail.com>
Chris@0:  */
Chris@0: class ResolveReferencesToAliasesPass implements CompilerPassInterface
Chris@0: {
Chris@0:     private $container;
Chris@0: 
Chris@0:     /**
Chris@0:      * Processes the ContainerBuilder to replace references to aliases with actual service references.
Chris@0:      *
Chris@0:      * @param ContainerBuilder $container
Chris@0:      */
Chris@0:     public function process(ContainerBuilder $container)
Chris@0:     {
Chris@0:         $this->container = $container;
Chris@0: 
Chris@0:         foreach ($container->getDefinitions() as $definition) {
Chris@0:             if ($definition->isSynthetic() || $definition->isAbstract()) {
Chris@0:                 continue;
Chris@0:             }
Chris@0: 
Chris@0:             $definition->setArguments($this->processArguments($definition->getArguments()));
Chris@0:             $definition->setMethodCalls($this->processArguments($definition->getMethodCalls()));
Chris@0:             $definition->setProperties($this->processArguments($definition->getProperties()));
Chris@0:             $definition->setFactory($this->processFactory($definition->getFactory()));
Chris@0:         }
Chris@0: 
Chris@0:         foreach ($container->getAliases() as $id => $alias) {
Chris@0:             $aliasId = (string) $alias;
Chris@0:             if ($aliasId !== $defId = $this->getDefinitionId($aliasId)) {
Chris@0:                 $container->setAlias($id, new Alias($defId, $alias->isPublic()));
Chris@0:             }
Chris@0:         }
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * Processes the arguments to replace aliases.
Chris@0:      *
Chris@0:      * @param array $arguments An array of References
Chris@0:      *
Chris@0:      * @return array An array of References
Chris@0:      */
Chris@0:     private function processArguments(array $arguments)
Chris@0:     {
Chris@0:         foreach ($arguments as $k => $argument) {
Chris@0:             if (is_array($argument)) {
Chris@0:                 $arguments[$k] = $this->processArguments($argument);
Chris@0:             } elseif ($argument instanceof Reference) {
Chris@0:                 $defId = $this->getDefinitionId($id = (string) $argument);
Chris@0: 
Chris@0:                 if ($defId !== $id) {
Chris@0:                     $arguments[$k] = new Reference($defId, $argument->getInvalidBehavior());
Chris@0:                 }
Chris@0:             }
Chris@0:         }
Chris@0: 
Chris@0:         return $arguments;
Chris@0:     }
Chris@0: 
Chris@0:     private function processFactory($factory)
Chris@0:     {
Chris@0:         if (null === $factory || !is_array($factory) || !$factory[0] instanceof Reference) {
Chris@0:             return $factory;
Chris@0:         }
Chris@0: 
Chris@0:         $defId = $this->getDefinitionId($id = (string) $factory[0]);
Chris@0: 
Chris@0:         if ($defId !== $id) {
Chris@0:             $factory[0] = new Reference($defId, $factory[0]->getInvalidBehavior());
Chris@0:         }
Chris@0: 
Chris@0:         return $factory;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * Resolves an alias into a definition id.
Chris@0:      *
Chris@0:      * @param string $id The definition or alias id to resolve
Chris@0:      *
Chris@0:      * @return string The definition id with aliases resolved
Chris@0:      */
Chris@0:     private function getDefinitionId($id)
Chris@0:     {
Chris@0:         $seen = array();
Chris@0:         while ($this->container->hasAlias($id)) {
Chris@0:             if (isset($seen[$id])) {
Chris@0:                 throw new ServiceCircularReferenceException($id, array_keys($seen));
Chris@0:             }
Chris@0:             $seen[$id] = true;
Chris@0:             $id = (string) $this->container->getAlias($id);
Chris@0:         }
Chris@0: 
Chris@0:         return $id;
Chris@0:     }
Chris@0: }