<?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;
use Psr\Container\ContainerInterface as PsrContainerInterface;
use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
/**
* @author Robin Chalas <robin.chalas@gmail.com>
* @author Nicolas Grekas <p@tchwork.com>
*/
class ServiceLocator implements PsrContainerInterface
{
private $factories;
private $loading = [];
private $externalId;
private $container;
/**
* @param callable[] $factories
*/
public function __construct(array $factories)
{
$this->factories = $factories;
}
/**
* {@inheritdoc}
*/
public function has($id)
{
return isset($this->factories[$id]);
}
/**
* {@inheritdoc}
*/
public function get($id)
{
if (!isset($this->factories[$id])) {
throw new ServiceNotFoundException($id, end($this->loading) ?: null, null, [], $this->createServiceNotFoundMessage($id));
}
if (isset($this->loading[$id])) {
$ids = array_values($this->loading);
$ids = \array_slice($this->loading, array_search($id, $ids));
$ids[] = $id;
throw new ServiceCircularReferenceException($id, $ids);
}
$this->loading[$id] = $id;
try {
return $this->factories[$id]();
} finally {
unset($this->loading[$id]);
}
}
public function __invoke($id)
{
return isset($this->factories[$id]) ? $this->get($id) : null;
}
/**
* @internal
*/
public function withContext($externalId, Container $container)
{
$locator = clone $this;
$locator->externalId = $externalId;
$locator->container = $container;
return $locator;
}
private function createServiceNotFoundMessage($id)
{
if ($this->loading) {
return sprintf('The service "%s" has a dependency on a non-existent service "%s". This locator %s', end($this->loading), $id, $this->formatAlternatives());
}
$class = debug_backtrace(\DEBUG_BACKTRACE_PROVIDE_OBJECT | \DEBUG_BACKTRACE_IGNORE_ARGS, 3);
$class = isset($class[2]['object']) ? \get_class($class[2]['object']) : null;
$externalId = $this->externalId ?: $class;
$msg = [];
$msg[] = sprintf('Service "%s" not found:', $id);
if (!$this->container) {
$class = null;
} elseif ($this->container->has($id) || isset($this->container->getRemovedIds()[$id])) {
$msg[] = 'even though it exists in the app\'s container,';
} else {
try {
$this->container->get($id);
$class = null;
} catch (ServiceNotFoundException $e) {
if ($e->getAlternatives()) {
$msg[] = sprintf('did you mean %s? Anyway,', $this->formatAlternatives($e->getAlternatives(), 'or'));
} else {
$class = null;
}
}
}
if ($externalId) {
$msg[] = sprintf('the container inside "%s" is a smaller service locator that %s', $externalId, $this->formatAlternatives());
} else {
$msg[] = sprintf('the current service locator %s', $this->formatAlternatives());
}
if (!$class) {
// no-op
} elseif (is_subclass_of($class, ServiceSubscriberInterface::class)) {
$msg[] = sprintf('Unless you need extra laziness, try using dependency injection instead. Otherwise, you need to declare it using "%s::getSubscribedServices()".', preg_replace('/([^\\\\]++\\\\)++/', '', $class));
} else {
$msg[] = 'Try using dependency injection instead.';
}
return implode(' ', $msg);
}
private function formatAlternatives(array $alternatives = null, $separator = 'and')
{
$format = '"%s"%s';
if (null === $alternatives) {
if (!$alternatives = array_keys($this->factories)) {
return 'is empty...';
}
$format = sprintf('only knows about the %s service%s.', $format, 1 < \count($alternatives) ? 's' : '');
}
$last = array_pop($alternatives);
return sprintf($format, $alternatives ? implode('", "', $alternatives) : $last, $alternatives ? sprintf(' %s "%s"', $separator, $last) : '');
}
}