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:      * @param ContainerBuilder $container
Chris@0:      */
Chris@0:     public function process(ContainerBuilder $container)
Chris@0:     {
Chris@0:         $compiler = $container->getCompiler();
Chris@0:         $formatter = $compiler->getLoggingFormatter();
Chris@0:         $graph = $compiler->getServiceReferenceGraph();
Chris@0: 
Chris@0:         $hasChanged = false;
Chris@0:         foreach ($container->getDefinitions() as $id => $definition) {
Chris@0:             if ($definition->isPublic()) {
Chris@0:                 continue;
Chris@0:             }
Chris@0: 
Chris@0:             if ($graph->hasNode($id)) {
Chris@0:                 $edges = $graph->getNode($id)->getInEdges();
Chris@0:                 $referencingAliases = array();
Chris@0:                 $sourceIds = array();
Chris@0:                 foreach ($edges as $edge) {
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@0:                 $isReferenced = (count(array_unique($sourceIds)) - count($referencingAliases)) > 0;
Chris@0:             } else {
Chris@0:                 $referencingAliases = array();
Chris@0:                 $isReferenced = false;
Chris@0:             }
Chris@0: 
Chris@0:             if (1 === count($referencingAliases) && false === $isReferenced) {
Chris@0:                 $container->setDefinition((string) reset($referencingAliases), $definition);
Chris@0:                 $definition->setPublic(true);
Chris@0:                 $container->removeDefinition($id);
Chris@0:                 $compiler->addLogMessage($formatter->formatRemoveService($this, $id, 'replaces alias '.reset($referencingAliases)));
Chris@0:             } elseif (0 === count($referencingAliases) && false === $isReferenced) {
Chris@0:                 $container->removeDefinition($id);
Chris@0:                 $container->resolveEnvPlaceholders(serialize($definition));
Chris@0:                 $compiler->addLogMessage($formatter->formatRemoveService($this, $id, 'unused'));
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: }