comparison vendor/symfony/dependency-injection/ServiceLocator.php @ 14:1fec387a4317

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[e-mail]>
+ *
+ * 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 <[e-mail]>
+ * @author Nicolas Grekas <[e-mail]>
+ */
+class ServiceLocator implements PsrContainerInterface
+{
+    private $factories;
+    private $loading = array();
+    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, array(), $this->createServiceNotFoundMessage($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 = 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 $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) : '');
+    }
+}