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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  use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
  16  use Symfony\Component\DependencyInjection\Reference;
  17  
  18  /**
  19   * Replaces all references to aliases with references to the actual service.
  20   *
  21   * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  22   */
  23  class ResolveReferencesToAliasesPass extends AbstractRecursivePass
  24  {
  25      /**
  26       * {@inheritdoc}
  27       */
  28      public function process(ContainerBuilder $container)
  29      {
  30          parent::process($container);
  31  
  32          foreach ($container->getAliases() as $id => $alias) {
  33              $aliasId = $container->normalizeId($alias);
  34              if ($aliasId !== $defId = $this->getDefinitionId($aliasId, $container)) {
  35                  $container->setAlias($id, $defId)->setPublic($alias->isPublic())->setPrivate($alias->isPrivate());
  36              }
  37          }
  38      }
  39  
  40      /**
  41       * {@inheritdoc}
  42       */
  43      protected function processValue($value, $isRoot = false)
  44      {
  45          if ($value instanceof Reference) {
  46              $defId = $this->getDefinitionId($id = $this->container->normalizeId($value), $this->container);
  47  
  48              if ($defId !== $id) {
  49                  return new Reference($defId, $value->getInvalidBehavior());
  50              }
  51          }
  52  
  53          return parent::processValue($value);
  54      }
  55  
  56      /**
  57       * Resolves an alias into a definition id.
  58       *
  59       * @param string $id The definition or alias id to resolve
  60       *
  61       * @return string The definition id with aliases resolved
  62       */
  63      private function getDefinitionId($id, ContainerBuilder $container)
  64      {
  65          $seen = [];
  66          while ($container->hasAlias($id)) {
  67              if (isset($seen[$id])) {
  68                  throw new ServiceCircularReferenceException($id, array_merge(array_keys($seen), [$id]));
  69              }
  70              $seen[$id] = true;
  71              $id = $container->normalizeId($container->getAlias($id));
  72          }
  73  
  74          return $id;
  75      }
  76  }