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1 <?php
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2
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3 /*
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4 * This file is part of the Symfony package.
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5 *
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6 * (c) Fabien Potencier <fabien@symfony.com>
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7 *
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8 * For the full copyright and license information, please view the LICENSE
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9 * file that was distributed with this source code.
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10 */
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11
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12 namespace Symfony\Component\DependencyInjection\Compiler;
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13
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14 use Symfony\Component\DependencyInjection\ContainerBuilder;
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15 use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
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16 use Symfony\Component\DependencyInjection\Reference;
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17
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18 /**
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19 * Replaces all references to aliases with references to the actual service.
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20 *
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21 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
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22 */
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23 class ResolveReferencesToAliasesPass extends AbstractRecursivePass
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24 {
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25 /**
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26 * {@inheritdoc}
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27 */
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28 public function process(ContainerBuilder $container)
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29 {
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30 parent::process($container);
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31
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32 foreach ($container->getAliases() as $id => $alias) {
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33 $aliasId = $container->normalizeId($alias);
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34 if ($aliasId !== $defId = $this->getDefinitionId($aliasId, $container)) {
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35 $container->setAlias($id, $defId)->setPublic($alias->isPublic())->setPrivate($alias->isPrivate());
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36 }
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37 }
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38 }
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39
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40 /**
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41 * {@inheritdoc}
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42 */
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43 protected function processValue($value, $isRoot = false)
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44 {
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45 if ($value instanceof Reference) {
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46 $defId = $this->getDefinitionId($id = $this->container->normalizeId($value), $this->container);
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47
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48 if ($defId !== $id) {
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49 return new Reference($defId, $value->getInvalidBehavior());
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50 }
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51 }
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52
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53 return parent::processValue($value);
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54 }
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55
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56 /**
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57 * Resolves an alias into a definition id.
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58 *
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59 * @param string $id The definition or alias id to resolve
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60 * @param ContainerBuilder $container
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61 *
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62 * @return string The definition id with aliases resolved
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63 */
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64 private function getDefinitionId($id, ContainerBuilder $container)
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65 {
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66 $seen = [];
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67 while ($container->hasAlias($id)) {
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68 if (isset($seen[$id])) {
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69 throw new ServiceCircularReferenceException($id, array_merge(array_keys($seen), [$id]));
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70 }
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71 $seen[$id] = true;
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72 $id = $container->normalizeId($container->getAlias($id));
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73 }
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74
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75 return $id;
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76 }
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77 }
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