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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\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.
*
* @param ContainerBuilder $container
*/
public function process(ContainerBuilder $container)
{
$compiler = $container->getCompiler();
$formatter = $compiler->getLoggingFormatter();
$graph = $compiler->getServiceReferenceGraph();
$hasChanged = false;
foreach ($container->getDefinitions() as $id => $definition) {
if ($definition->isPublic()) {
continue;
}
if ($graph->hasNode($id)) {
$edges = $graph->getNode($id)->getInEdges();
$referencingAliases = array();
$sourceIds = array();
foreach ($edges as $edge) {
$node = $edge->getSourceNode();
$sourceIds[] = $node->getId();
if ($node->isAlias()) {
$referencingAliases[] = $node->getValue();
}
}
$isReferenced = (count(array_unique($sourceIds)) - count($referencingAliases)) > 0;
} else {
$referencingAliases = array();
$isReferenced = false;
}
if (1 === count($referencingAliases) && false === $isReferenced) {
$container->setDefinition((string) reset($referencingAliases), $definition);
$definition->setPublic(true);
$container->removeDefinition($id);
$compiler->addLogMessage($formatter->formatRemoveService($this, $id, 'replaces alias '.reset($referencingAliases)));
} elseif (0 === count($referencingAliases) && false === $isReferenced) {
$container->removeDefinition($id);
$compiler->addLogMessage($formatter->formatRemoveService($this, $id, 'unused'));
$hasChanged = true;
}
}
if ($hasChanged) {
$this->repeatedPass->setRepeat();
}
}
}
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