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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
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16 /**
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17 * Removes unused service definitions from the container.
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18 *
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19 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
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20 */
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21 class RemoveUnusedDefinitionsPass implements RepeatablePassInterface
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22 {
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23 private $repeatedPass;
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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 setRepeatedPass(RepeatedPass $repeatedPass)
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29 {
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30 $this->repeatedPass = $repeatedPass;
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31 }
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32
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33 /**
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34 * Processes the ContainerBuilder to remove unused definitions.
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35 */
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36 public function process(ContainerBuilder $container)
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37 {
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38 $graph = $container->getCompiler()->getServiceReferenceGraph();
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39
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40 $hasChanged = false;
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41 foreach ($container->getDefinitions() as $id => $definition) {
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42 if ($definition->isPublic() || $definition->isPrivate()) {
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43 continue;
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44 }
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45
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46 if ($graph->hasNode($id)) {
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47 $edges = $graph->getNode($id)->getInEdges();
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48 $referencingAliases = [];
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49 $sourceIds = [];
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50 foreach ($edges as $edge) {
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51 if ($edge->isWeak()) {
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52 continue;
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53 }
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54 $node = $edge->getSourceNode();
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55 $sourceIds[] = $node->getId();
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56
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57 if ($node->isAlias()) {
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58 $referencingAliases[] = $node->getValue();
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59 }
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60 }
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61 $isReferenced = (\count(array_unique($sourceIds)) - \count($referencingAliases)) > 0;
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62 } else {
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63 $referencingAliases = [];
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64 $isReferenced = false;
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65 }
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66
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67 if (1 === \count($referencingAliases) && false === $isReferenced) {
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68 $container->setDefinition((string) reset($referencingAliases), $definition);
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69 $definition->setPublic(!$definition->isPrivate());
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70 $definition->setPrivate(reset($referencingAliases)->isPrivate());
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71 $container->removeDefinition($id);
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72 $container->log($this, sprintf('Removed service "%s"; reason: replaces alias %s.', $id, reset($referencingAliases)));
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73 } elseif (0 === \count($referencingAliases) && false === $isReferenced) {
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74 $container->removeDefinition($id);
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75 $container->resolveEnvPlaceholders(serialize($definition));
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76 $container->log($this, sprintf('Removed service "%s"; reason: unused.', $id));
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77 $hasChanged = true;
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78 }
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79 }
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80
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81 if ($hasChanged) {
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82 $this->repeatedPass->setRepeat();
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83 }
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84 }
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85 }
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