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\ContainerBuilder;
Chris@0: 
Chris@0: /**
Chris@0:  * Removes unused service definitions from the container.
Chris@0:  *
Chris@0:  * @author Johannes M. Schmitt <schmittjoh@gmail.com>
Chris@0:  */
Chris@0: class RemoveUnusedDefinitionsPass implements RepeatablePassInterface
Chris@0: {
Chris@0:     private $repeatedPass;
Chris@0: 
Chris@0:     /**
Chris@0:      * {@inheritdoc}
Chris@0:      */
Chris@0:     public function setRepeatedPass(RepeatedPass $repeatedPass)
Chris@0:     {
Chris@0:         $this->repeatedPass = $repeatedPass;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * Processes the ContainerBuilder to remove unused definitions.
Chris@0:      */
Chris@0:     public function process(ContainerBuilder $container)
Chris@0:     {
Chris@14:         $graph = $container->getCompiler()->getServiceReferenceGraph();
Chris@0: 
Chris@0:         $hasChanged = false;
Chris@0:         foreach ($container->getDefinitions() as $id => $definition) {
Chris@14:             if ($definition->isPublic() || $definition->isPrivate()) {
Chris@0:                 continue;
Chris@0:             }
Chris@0: 
Chris@0:             if ($graph->hasNode($id)) {
Chris@0:                 $edges = $graph->getNode($id)->getInEdges();
Chris@17:                 $referencingAliases = [];
Chris@17:                 $sourceIds = [];
Chris@0:                 foreach ($edges as $edge) {
Chris@14:                     if ($edge->isWeak()) {
Chris@14:                         continue;
Chris@14:                     }
Chris@0:                     $node = $edge->getSourceNode();
Chris@0:                     $sourceIds[] = $node->getId();
Chris@0: 
Chris@0:                     if ($node->isAlias()) {
Chris@0:                         $referencingAliases[] = $node->getValue();
Chris@0:                     }
Chris@0:                 }
Chris@17:                 $isReferenced = (\count(array_unique($sourceIds)) - \count($referencingAliases)) > 0;
Chris@0:             } else {
Chris@17:                 $referencingAliases = [];
Chris@0:                 $isReferenced = false;
Chris@0:             }
Chris@0: 
Chris@17:             if (1 === \count($referencingAliases) && false === $isReferenced) {
Chris@0:                 $container->setDefinition((string) reset($referencingAliases), $definition);
Chris@14:                 $definition->setPublic(!$definition->isPrivate());
Chris@14:                 $definition->setPrivate(reset($referencingAliases)->isPrivate());
Chris@0:                 $container->removeDefinition($id);
Chris@14:                 $container->log($this, sprintf('Removed service "%s"; reason: replaces alias %s.', $id, reset($referencingAliases)));
Chris@17:             } elseif (0 === \count($referencingAliases) && false === $isReferenced) {
Chris@0:                 $container->removeDefinition($id);
Chris@0:                 $container->resolveEnvPlaceholders(serialize($definition));
Chris@14:                 $container->log($this, sprintf('Removed service "%s"; reason: unused.', $id));
Chris@0:                 $hasChanged = true;
Chris@0:             }
Chris@0:         }
Chris@0: 
Chris@0:         if ($hasChanged) {
Chris@0:             $this->repeatedPass->setRepeat();
Chris@0:         }
Chris@0:     }
Chris@0: }