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