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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 Psr\Container\ContainerInterface;
  15  use Symfony\Component\DependencyInjection\Definition;
  16  use Symfony\Component\DependencyInjection\Reference;
  17  
  18  /**
  19   * Compiler pass to inject their service locator to service subscribers.
  20   *
  21   * @author Nicolas Grekas <p@tchwork.com>
  22   */
  23  class ResolveServiceSubscribersPass extends AbstractRecursivePass
  24  {
  25      private $serviceLocator;
  26  
  27      protected function processValue($value, $isRoot = false)
  28      {
  29          if ($value instanceof Reference && $this->serviceLocator && ContainerInterface::class === $this->container->normalizeId($value)) {
  30              return new Reference($this->serviceLocator);
  31          }
  32  
  33          if (!$value instanceof Definition) {
  34              return parent::processValue($value, $isRoot);
  35          }
  36  
  37          $serviceLocator = $this->serviceLocator;
  38          $this->serviceLocator = null;
  39  
  40          if ($value->hasTag('container.service_subscriber.locator')) {
  41              $this->serviceLocator = $value->getTag('container.service_subscriber.locator')[0]['id'];
  42              $value->clearTag('container.service_subscriber.locator');
  43          }
  44  
  45          try {
  46              return parent::processValue($value);
  47          } finally {
  48              $this->serviceLocator = $serviceLocator;
  49          }
  50      }
  51  }