<?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\ContainerBuilder;
/**
* Removes unused service definitions from the container.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
*/
class RemoveUnusedDefinitionsPass implements RepeatablePassInterface
{
private $repeatedPass;
/**
* {@inheritdoc}
*/
public function setRepeatedPass(RepeatedPass $repeatedPass)
{
$this->repeatedPass = $repeatedPass;
}
/**
* Processes the ContainerBuilder to remove unused definitions.
*/
public function process(ContainerBuilder $container)
{
$graph = $container->getCompiler()->getServiceReferenceGraph();
$hasChanged = false;
foreach ($container->getDefinitions() as $id => $definition) {
if ($definition->isPublic() || $definition->isPrivate()) {
continue;
}
if ($graph->hasNode($id)) {
$edges = $graph->getNode($id)->getInEdges();
$referencingAliases = [];
$sourceIds = [];
foreach ($edges as $edge) {
if ($edge->isWeak()) {
continue;
}
$node = $edge->getSourceNode();
$sourceIds[] = $node->getId();
if ($node->isAlias()) {
$referencingAliases[] = $node->getValue();
}
}
$isReferenced = (\count(array_unique($sourceIds)) - \count($referencingAliases)) > 0;
} else {
$referencingAliases = [];
$isReferenced = false;
}
if (1 === \count($referencingAliases) && false === $isReferenced) {
$container->setDefinition((string) reset($referencingAliases), $definition);
$definition->setPublic(!$definition->isPrivate());
$definition->setPrivate(reset($referencingAliases)->isPrivate());
$container->removeDefinition($id);
$container->log($this, sprintf('Removed service "%s"; reason: replaces alias %s.', $id, reset($referencingAliases)));
} elseif (0 === \count($referencingAliases) && false === $isReferenced) {
$container->removeDefinition($id);
$container->resolveEnvPlaceholders(serialize($definition));
$container->log($this, sprintf('Removed service "%s"; reason: unused.', $id));
$hasChanged = true;
}
}
if ($hasChanged) {
$this->repeatedPass->setRepeat();
}
}
}