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   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          $compiler = $container->getCompiler();
  39          $formatter = $compiler->getLoggingFormatter();
  40          $graph = $compiler->getServiceReferenceGraph();
  41  
  42          $hasChanged = false;
  43          foreach ($container->getDefinitions() as $id => $definition) {
  44              if ($definition->isPublic()) {
  45                  continue;
  46              }
  47  
  48              if ($graph->hasNode($id)) {
  49                  $edges = $graph->getNode($id)->getInEdges();
  50                  $referencingAliases = array();
  51                  $sourceIds = array();
  52                  foreach ($edges as $edge) {
  53                      $node = $edge->getSourceNode();
  54                      $sourceIds[] = $node->getId();
  55  
  56                      if ($node->isAlias()) {
  57                          $referencingAliases[] = $node->getValue();
  58                      }
  59                  }
  60                  $isReferenced = (\count(array_unique($sourceIds)) - \count($referencingAliases)) > 0;
  61              } else {
  62                  $referencingAliases = array();
  63                  $isReferenced = false;
  64              }
  65  
  66              if (1 === \count($referencingAliases) && false === $isReferenced) {
  67                  $container->setDefinition((string) reset($referencingAliases), $definition);
  68                  $definition->setPublic(true);
  69                  $container->removeDefinition($id);
  70                  $compiler->addLogMessage($formatter->formatRemoveService($this, $id, 'replaces alias '.reset($referencingAliases)));
  71              } elseif (0 === \count($referencingAliases) && false === $isReferenced) {
  72                  $container->removeDefinition($id);
  73                  $compiler->addLogMessage($formatter->formatRemoveService($this, $id, 'unused'));
  74                  $hasChanged = true;
  75              }
  76          }
  77  
  78          if ($hasChanged) {
  79              $this->repeatedPass->setRepeat();
  80          }
  81      }
  82  }