class RemoveUnusedDefinitionsPass

RemoveUnusedDefinitionsPassTest.php in drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Tests/Compiler/RemoveUnusedDefinitionsPassTest.php

class RemoveUnusedDefinitionsPass implements RepeatablePassInterface {
  private $repeatedPass;

  /**
   * {@inheritDoc}
   */
  public function setRepeatedPass(RepeatedPass $repeatedPass) {
    $this->repeatedPass = $repeatedPass;
  }

  /**
   * Processes the ContainerBuilder to remove unused definitions.
   *
   * @param ContainerBuilder $container
   */
  public function process(ContainerBuilder $container) {
    $compiler = $container
      ->getCompiler();
    $formatter = $compiler
      ->getLoggingFormatter();
    $graph = $compiler
      ->getServiceReferenceGraph();
    $hasChanged = false;
    foreach ($container
      ->getDefinitions() as $id => $definition) {
      if ($definition
        ->isPublic()) {
        continue;
      }
      if ($graph
        ->hasNode($id)) {
        $edges = $graph
          ->getNode($id)
          ->getInEdges();
        $referencingAliases = array();
        $sourceIds = array();
        foreach ($edges as $edge) {
          $node = $edge
            ->getSourceNode();
          $sourceIds[] = $node
            ->getId();
          if ($node
            ->isAlias()) {
            $referencingAliases[] = $node
              ->getValue();
          }
        }
        $isReferenced = count(array_unique($sourceIds)) - count($referencingAliases) > 0;
      }
      else {
        $referencingAliases = array();
        $isReferenced = false;
      }
      if (1 === count($referencingAliases) && false === $isReferenced) {
        $container
          ->setDefinition((string) reset($referencingAliases), $definition);
        $definition
          ->setPublic(true);
        $container
          ->removeDefinition($id);
        $compiler
          ->addLogMessage($formatter
          ->formatRemoveService($this, $id, 'replaces alias ' . reset($referencingAliases)));
      }
      elseif (0 === count($referencingAliases) && false === $isReferenced) {
        $container
          ->removeDefinition($id);
        $compiler
          ->addLogMessage($formatter
          ->formatRemoveService($this, $id, 'unused'));
        $hasChanged = true;
      }
    }
    if ($hasChanged) {
      $this->repeatedPass
        ->setRepeat();
    }
  }

}