www.aleph1.co.uk Git - yaffs-website/blob - vendor/symfony/dependency-injection/Compiler/RemoveUnusedDefinitionsPass.php

   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\ContainerBuilder;
  15
  16 /**
  17  * Removes unused service definitions from the container.
  18  *
  19  * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  20  */
  21 class RemoveUnusedDefinitionsPass implements RepeatablePassInterface
  22 {
  23     private $repeatedPass;
  24
  25     /**
  26      * {@inheritdoc}
  27      */
  28     public function setRepeatedPass(RepeatedPass $repeatedPass)
  29     {
  30         $this->repeatedPass = $repeatedPass;
  31     }
  32
  33     /**
  34      * Processes the ContainerBuilder to remove unused definitions.
  35      */
  36     public function process(ContainerBuilder $container)
  37     {
  38         $graph = $container->getCompiler()->getServiceReferenceGraph();
  39
  40         $hasChanged = false;
  41         foreach ($container->getDefinitions() as $id => $definition) {
  42             if ($definition->isPublic() || $definition->isPrivate()) {
  43                 continue;
  44             }
  45
  46             if ($graph->hasNode($id)) {
  47                 $edges = $graph->getNode($id)->getInEdges();
  48                 $referencingAliases = array();
  49                 $sourceIds = array();
  50                 foreach ($edges as $edge) {
  51                     if ($edge->isWeak()) {
  52                         continue;
  53                     }
  54                     $node = $edge->getSourceNode();
  55                     $sourceIds[] = $node->getId();
  56
  57                     if ($node->isAlias()) {
  58                         $referencingAliases[] = $node->getValue();
  59                     }
  60                 }
  61                 $isReferenced = (count(array_unique($sourceIds)) - count($referencingAliases)) > 0;
  62             } else {
  63                 $referencingAliases = array();
  64                 $isReferenced = false;
  65             }
  66
  67             if (1 === count($referencingAliases) && false === $isReferenced) {
  68                 $container->setDefinition((string) reset($referencingAliases), $definition);
  69                 $definition->setPublic(!$definition->isPrivate());
  70                 $definition->setPrivate(reset($referencingAliases)->isPrivate());
  71                 $container->removeDefinition($id);
  72                 $container->log($this, sprintf('Removed service "%s"; reason: replaces alias %s.', $id, reset($referencingAliases)));
  73             } elseif (0 === count($referencingAliases) && false === $isReferenced) {
  74                 $container->removeDefinition($id);
  75                 $container->resolveEnvPlaceholders(serialize($definition));
  76                 $container->log($this, sprintf('Removed service "%s"; reason: unused.', $id));
  77                 $hasChanged = true;
  78             }
  79         }
  80
  81         if ($hasChanged) {
  82             $this->repeatedPass->setRepeat();
  83         }
  84     }
  85 }