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- 06.01.2017
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ResolveReferencesToAliasesPass.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\DependencyInjection\Compiler;
013
014 use Symfony\Component\DependencyInjection\Alias;
015 use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
016 use Symfony\Component\DependencyInjection\Reference;
017 use Symfony\Component\DependencyInjection\ContainerBuilder;
018
019 /**
020 * Replaces all references to aliases with references to the actual service.
021 *
022 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
023 */
024 class ResolveReferencesToAliasesPass implements CompilerPassInterface
025 {
026 private $container;
027
028 /**
029 * Processes the ContainerBuilder to replace references to aliases with actual service references.
030 *
031 * @param ContainerBuilder $container
032 */
033 public function process(ContainerBuilder $container)
034 {
035 $this->container = $container;
036
037 foreach ($container->getDefinitions() as $definition) {
038 if ($definition->isSynthetic() || $definition->isAbstract()) {
039 continue;
040 }
041
042 $definition->setArguments($this->processArguments($definition->getArguments()));
043 $definition->setMethodCalls($this->processArguments($definition->getMethodCalls()));
044 $definition->setProperties($this->processArguments($definition->getProperties()));
045 $definition->setFactory($this->processFactory($definition->getFactory()));
046 $definition->setFactoryService($this->processFactoryService($definition->getFactoryService(false)), false);
047 }
048
049 foreach ($container->getAliases() as $id => $alias) {
050 $aliasId = (string) $alias;
051 if ($aliasId !== $defId = $this->getDefinitionId($aliasId)) {
052 $container->setAlias($id, new Alias($defId, $alias->isPublic()));
053 }
054 }
055 }
056
057 /**
058 * Processes the arguments to replace aliases.
059 *
060 * @param array $arguments An array of References
061 *
062 * @return array An array of References
063 */
064 private function processArguments(array $arguments)
065 {
066 foreach ($arguments as $k => $argument) {
067 if (is_array($argument)) {
068 $arguments[$k] = $this->processArguments($argument);
069 } elseif ($argument instanceof Reference) {
070 $defId = $this->getDefinitionId($id = (string) $argument);
071
072 if ($defId !== $id) {
073 $arguments[$k] = new Reference($defId, $argument->getInvalidBehavior(), $argument->isStrict(false));
074 }
075 }
076 }
077
078 return $arguments;
079 }
080
081 private function processFactoryService($factoryService)
082 {
083 if (null === $factoryService) {
084 return;
085 }
086
087 return $this->getDefinitionId($factoryService);
088 }
089
090 private function processFactory($factory)
091 {
092 if (null === $factory || !is_array($factory) || !$factory[0] instanceof Reference) {
093 return $factory;
094 }
095
096 $defId = $this->getDefinitionId($id = (string) $factory[0]);
097
098 if ($defId !== $id) {
099 $factory[0] = new Reference($defId, $factory[0]->getInvalidBehavior(), $factory[0]->isStrict(false));
100 }
101
102 return $factory;
103 }
104
105 /**
106 * Resolves an alias into a definition id.
107 *
108 * @param string $id The definition or alias id to resolve
109 *
110 * @return string The definition id with aliases resolved
111 */
112 private function getDefinitionId($id)
113 {
114 $seen = array();
115 while ($this->container->hasAlias($id)) {
116 if (isset($seen[$id])) {
117 throw new ServiceCircularReferenceException($id, array_keys($seen));
118 }
119 $seen[$id] = true;
120 $id = (string) $this->container->getAlias($id);
121 }
122
123 return $id;
124 }
125 }
126