1 <?php

     2 

     3 /*

     4  * This file is part of the Symfony package.

     5  *

     6  * (c) Fabien Potencier <fabien@symfony.com>

     7  *

     8  * For the full copyright and license information, please view the LICENSE

     9  * file that was distributed with this source code.

    10  */

    11 

    12 namespace Symfony\Component\DependencyInjection\Compiler;

    13 

    14 use Symfony\Component\DependencyInjection\Alias;

    15 use Symfony\Component\DependencyInjection\Reference;

    16 use Symfony\Component\DependencyInjection\ContainerBuilder;

    17 

    18 /**

    19  * Replaces all references to aliases with references to the actual service.

    20  *

    21  * @author Johannes M. Schmitt <schmittjoh@gmail.com>

    22  */

    23 class ResolveReferencesToAliasesPass implements CompilerPassInterface

    24 {

    25     private $container;

    26 

    27     /**

    28      * Processes the ContainerBuilder to replace references to aliases with actual service references.

    29      *

    30      * @param ContainerBuilder $container

    31      */

    32     public function process(ContainerBuilder $container)

    33     {

    34         $this->container = $container;

    35 

    36         foreach ($container->getDefinitions() as $definition) {

    37             if ($definition->isSynthetic() || $definition->isAbstract()) {

    38                 continue;

    39             }

    40 

    41             $definition->setArguments($this->processArguments($definition->getArguments()));

    42             $definition->setMethodCalls($this->processArguments($definition->getMethodCalls()));

    43             $definition->setProperties($this->processArguments($definition->getProperties()));

    44         }

    45 

    46         foreach ($container->getAliases() as $id => $alias) {

    47             $aliasId = (string) $alias;

    48             if ($aliasId !== $defId = $this->getDefinitionId($aliasId)) {

    49                 $container->setAlias($id, new Alias($defId, $alias->isPublic()));

    50             }

    51         }

    52     }

    53 

    54     /**

    55      * Processes the arguments to replace aliases

    56      *

    57      * @param array $arguments An array of References

    58      * @return array An array of References

    59      */

    60     private function processArguments(array $arguments)

    61     {

    62         foreach ($arguments as $k => $argument) {

    63             if (is_array($argument)) {

    64                 $arguments[$k] = $this->processArguments($argument);

    65             } elseif ($argument instanceof Reference) {

    66                 $defId = $this->getDefinitionId($id = (string) $argument);

    67 

    68                 if ($defId !== $id) {

    69                     $arguments[$k] = new Reference($defId, $argument->getInvalidBehavior(), $argument->isStrict());

    70                 }

    71             }

    72         }

    73 

    74         return $arguments;

    75     }

    76 

    77     /**

    78      * Resolve an alias into a definition id

    79      *

    80      * @param string $id The definition or alias id to resolve

    81      * @return string The definition id with aliases resolved

    82      */

    83     private function getDefinitionId($id)

    84     {

    85         while ($this->container->hasAlias($id)) {

    86             $id = (string) $this->container->getAlias($id);

    87         }

    88 

    89         return $id;

    90     }

    91 }