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@17: use Symfony\Component\DependencyInjection\ContainerBuilder;
Chris@0: use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
Chris@0: use Symfony\Component\DependencyInjection\Reference;
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@14: class ResolveReferencesToAliasesPass extends AbstractRecursivePass
Chris@0: {
Chris@0:     /**
Chris@14:      * {@inheritdoc}
Chris@0:      */
Chris@0:     public function process(ContainerBuilder $container)
Chris@0:     {
Chris@14:         parent::process($container);
Chris@0: 
Chris@0:         foreach ($container->getAliases() as $id => $alias) {
Chris@14:             $aliasId = $container->normalizeId($alias);
Chris@14:             if ($aliasId !== $defId = $this->getDefinitionId($aliasId, $container)) {
Chris@14:                 $container->setAlias($id, $defId)->setPublic($alias->isPublic())->setPrivate($alias->isPrivate());
Chris@0:             }
Chris@0:         }
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@14:      * {@inheritdoc}
Chris@0:      */
Chris@14:     protected function processValue($value, $isRoot = false)
Chris@0:     {
Chris@14:         if ($value instanceof Reference) {
Chris@14:             $defId = $this->getDefinitionId($id = $this->container->normalizeId($value), $this->container);
Chris@0: 
Chris@14:             if ($defId !== $id) {
Chris@14:                 return new Reference($defId, $value->getInvalidBehavior());
Chris@0:             }
Chris@0:         }
Chris@0: 
Chris@14:         return parent::processValue($value);
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * Resolves an alias into a definition id.
Chris@0:      *
Chris@14:      * @param string           $id        The definition or alias id to resolve
Chris@14:      * @param ContainerBuilder $container
Chris@0:      *
Chris@0:      * @return string The definition id with aliases resolved
Chris@0:      */
Chris@14:     private function getDefinitionId($id, ContainerBuilder $container)
Chris@0:     {
Chris@17:         $seen = [];
Chris@14:         while ($container->hasAlias($id)) {
Chris@0:             if (isset($seen[$id])) {
Chris@17:                 throw new ServiceCircularReferenceException($id, array_merge(array_keys($seen), [$id]));
Chris@0:             }
Chris@0:             $seen[$id] = true;
Chris@14:             $id = $container->normalizeId($container->getAlias($id));
Chris@0:         }
Chris@0: 
Chris@0:         return $id;
Chris@0:     }
Chris@0: }