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- 28.08.2024
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RemoveUnusedDefinitionsPass.php
01 <?php
02
03 /*
04 * This file is part of the Symfony package.
05 *
06 * (c) Fabien Potencier <fabien@symfony.com>
07 *
08 * For the full copyright and license information, please view the LICENSE
09 * file that was distributed with this source code.
10 */
11
12 namespace Symfony\Component\DependencyInjection\Compiler;
13
14 use Symfony\Component\DependencyInjection\ContainerBuilder;
15
16 /**
17 * Removes unused service definitions from the container.
18 *
19 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
20 */
21 class RemoveUnusedDefinitionsPass implements RepeatablePassInterface
22 {
23 private $repeatedPass;
24
25 /**
26 * {@inheritdoc}
27 */
28 public function setRepeatedPass(RepeatedPass $repeatedPass)
29 {
30 $this->repeatedPass = $repeatedPass;
31 }
32
33 /**
34 * Processes the ContainerBuilder to remove unused definitions.
35 */
36 public function process(ContainerBuilder $container)
37 {
38 $graph = $container->getCompiler()->getServiceReferenceGraph();
39
40 $hasChanged = false;
41 foreach ($container->getDefinitions() as $id => $definition) {
42 if ($definition->isPublic() || $definition->isPrivate()) {
43 continue;
44 }
45
46 if ($graph->hasNode($id)) {
47 $edges = $graph->getNode($id)->getInEdges();
48 $referencingAliases = [];
49 $sourceIds = [];
50 foreach ($edges as $edge) {
51 if ($edge->isWeak()) {
52 continue;
53 }
54 $node = $edge->getSourceNode();
55 $sourceIds[] = $node->getId();
56
57 if ($node->isAlias()) {
58 $referencingAliases[] = $node->getValue();
59 }
60 }
61 $isReferenced = (\count(array_unique($sourceIds)) - \count($referencingAliases)) > 0;
62 } else {
63 $referencingAliases = [];
64 $isReferenced = false;
65 }
66
67 if (1 === \count($referencingAliases) && false === $isReferenced) {
68 $container->setDefinition((string) reset($referencingAliases), $definition);
69 $definition->setPublic(!$definition->isPrivate());
70 $definition->setPrivate(reset($referencingAliases)->isPrivate());
71 $container->removeDefinition($id);
72 $container->log($this, sprintf('Removed service "%s"; reason: replaces alias %s.', $id, reset($referencingAliases)));
73 } elseif (0 === \count($referencingAliases) && false === $isReferenced) {
74 $container->removeDefinition($id);
75 $container->resolveEnvPlaceholders(serialize($definition));
76 $container->log($this, sprintf('Removed service "%s"; reason: unused.', $id));
77 $hasChanged = true;
78 }
79 }
80
81 if ($hasChanged) {
82 $this->repeatedPass->setRepeat();
83 }
84 }
85 }
86