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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\DependencyInjection\Compiler;
use Symfony\Component\DependencyInjection\Alias;
use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
use Symfony\Component\DependencyInjection\Reference;
use Symfony\Component\DependencyInjection\ContainerBuilder;
/**
* Replaces all references to aliases with references to the actual service.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
*/
class ResolveReferencesToAliasesPass implements CompilerPassInterface
{
private $container;
/**
* Processes the ContainerBuilder to replace references to aliases with actual service references.
*
* @param ContainerBuilder $container
*/
public function process(ContainerBuilder $container)
{
$this->container = $container;
foreach ($container->getDefinitions() as $definition) {
if ($definition->isSynthetic() || $definition->isAbstract()) {
continue;
}
$definition->setArguments($this->processArguments($definition->getArguments()));
$definition->setMethodCalls($this->processArguments($definition->getMethodCalls()));
$definition->setProperties($this->processArguments($definition->getProperties()));
}
foreach ($container->getAliases() as $id => $alias) {
$aliasId = (string) $alias;
if ($aliasId !== $defId = $this->getDefinitionId($aliasId)) {
$container->setAlias($id, new Alias($defId, $alias->isPublic()));
}
}
}
/**
* Processes the arguments to replace aliases.
*
* @param array $arguments An array of References
*
* @return array An array of References
*/
private function processArguments(array $arguments)
{
foreach ($arguments as $k => $argument) {
if (is_array($argument)) {
$arguments[$k] = $this->processArguments($argument);
} elseif ($argument instanceof Reference) {
$defId = $this->getDefinitionId($id = (string) $argument);
if ($defId !== $id) {
$arguments[$k] = new Reference($defId, $argument->getInvalidBehavior(), $argument->isStrict());
}
}
}
return $arguments;
}
/**
* Resolves an alias into a definition id.
*
* @param string $id The definition or alias id to resolve
*
* @return string The definition id with aliases resolved
*/
private function getDefinitionId($id)
{
$seen = array();
while ($this->container->hasAlias($id)) {
if (isset($seen[$id])) {
throw new ServiceCircularReferenceException($id, array_keys($seen));
}
$seen[$id] = true;
$id = (string) $this->container->getAlias($id);
}
return $id;
}
}
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