Add Composer autoloading functions and PHPStan for testing

vendor/symfony/contracts/Service/ResetInterface.php

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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\Contracts\Service;
+
+/**
+ * Provides a way to reset an object to its initial state.
+ *
+ * When calling the "reset()" method on an object, it should be put back to its
+ * initial state. This usually means clearing any internal buffers and forwarding
+ * the call to internal dependencies. All properties of the object should be put
+ * back to the same state it had when it was first ready to use.
+ *
+ * This method could be called, for example, to recycle objects that are used as
+ * services, so that they can be used to handle several requests in the same
+ * process loop (note that we advise making your services stateless instead of
+ * implementing this interface when possible.)
+ */
+interface ResetInterface
+{
+    public function reset();
+}

vendor/symfony/contracts/Service/ServiceLocatorTrait.php

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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\Contracts\Service;
+
+use Psr\Container\ContainerExceptionInterface;
+use Psr\Container\NotFoundExceptionInterface;
+
+/**
+ * A trait to help implement PSR-11 service locators.
+ *
+ * @author Robin Chalas <robin.chalas@gmail.com>
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+trait ServiceLocatorTrait
+{
+    private $factories;
+    private $loading = array();
+
+    /**
+     * @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 $this->createNotFoundException($id);
+        }
+
+        if (isset($this->loading[$id])) {
+            $ids = array_values($this->loading);
+            $ids = \array_slice($this->loading, array_search($id, $ids));
+            $ids[] = $id;
+
+            throw $this->createCircularReferenceException($id, $ids);
+        }
+
+        $this->loading[$id] = $id;
+        try {
+            return $this->factories[$id]($this);
+        } finally {
+            unset($this->loading[$id]);
+        }
+    }
+
+    private function createNotFoundException(string $id): NotFoundExceptionInterface
+    {
+        if (!$alternatives = array_keys($this->factories)) {
+            $message = 'is empty...';
+        } else {
+            $last = array_pop($alternatives);
+            if ($alternatives) {
+                $message = sprintf('only knows about the "%s" and "%s" services.', implode('", "', $alternatives), $last);
+            } else {
+                $message = sprintf('only knows about the "%s" service.', $last);
+            }
+        }
+
+        if ($this->loading) {
+            $message = sprintf('The service "%s" has a dependency on a non-existent service "%s". This locator %s', end($this->loading), $id, $message);
+        } else {
+            $message = sprintf('Service "%s" not found: the current service locator %s', $id, $message);
+        }
+
+        return new class($message) extends \InvalidArgumentException implements NotFoundExceptionInterface {
+        };
+    }
+
+    private function createCircularReferenceException(string $id, array $path): ContainerExceptionInterface
+    {
+        return new class(sprintf('Circular reference detected for service "%s", path: "%s".', $id, implode(' -> ', $path))) extends \RuntimeException implements ContainerExceptionInterface {
+        };
+    }
+}

vendor/symfony/contracts/Service/ServiceSubscriberInterface.php

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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\Contracts\Service;
+
+/**
+ * A ServiceSubscriber exposes its dependencies via the static {@link getSubscribedServices} method.
+ *
+ * The getSubscribedServices method returns an array of service types required by such instances,
+ * optionally keyed by the service names used internally. Service types that start with an interrogation
+ * mark "?" are optional, while the other ones are mandatory service dependencies.
+ *
+ * The injected service locators SHOULD NOT allow access to any other services not specified by the method.
+ *
+ * It is expected that ServiceSubscriber instances consume PSR-11-based service locators internally.
+ * This interface does not dictate any injection method for these service locators, although constructor
+ * injection is recommended.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+interface ServiceSubscriberInterface
+{
+    /**
+     * Returns an array of service types required by such instances, optionally keyed by the service names used internally.
+     *
+     * For mandatory dependencies:
+     *
+     *  * array('logger' => 'Psr\Log\LoggerInterface') means the objects use the "logger" name
+     *    internally to fetch a service which must implement Psr\Log\LoggerInterface.
+     *  * array('loggers' => 'Psr\Log\LoggerInterface[]') means the objects use the "loggers" name
+     *    internally to fetch an iterable of Psr\Log\LoggerInterface instances.
+     *  * array('Psr\Log\LoggerInterface') is a shortcut for
+     *  * array('Psr\Log\LoggerInterface' => 'Psr\Log\LoggerInterface')
+     *
+     * otherwise:
+     *
+     *  * array('logger' => '?Psr\Log\LoggerInterface') denotes an optional dependency
+     *  * array('loggers' => '?Psr\Log\LoggerInterface[]') denotes an optional iterable dependency
+     *  * array('?Psr\Log\LoggerInterface') is a shortcut for
+     *  * array('Psr\Log\LoggerInterface' => '?Psr\Log\LoggerInterface')
+     *
+     * @return array The required service types, optionally keyed by service names
+     */
+    public static function getSubscribedServices();
+}

vendor/symfony/contracts/Service/ServiceSubscriberTrait.php

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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\Contracts\Service;
+
+use Psr\Container\ContainerInterface;
+
+/**
+ * Implementation of ServiceSubscriberInterface that determines subscribed services from
+ * private method return types. Service ids are available as "ClassName::methodName".
+ *
+ * @author Kevin Bond <kevinbond@gmail.com>
+ */
+trait ServiceSubscriberTrait
+{
+    /** @var ContainerInterface */
+    private $container;
+
+    public static function getSubscribedServices(): array
+    {
+        static $services;
+
+        if (null !== $services) {
+            return $services;
+        }
+
+        $services = \is_callable(array('parent', __FUNCTION__)) ? parent::getSubscribedServices() : array();
+
+        foreach ((new \ReflectionClass(self::class))->getMethods() as $method) {
+            if ($method->isStatic() || $method->isAbstract() || $method->isGenerator() || $method->isInternal() || $method->getNumberOfRequiredParameters()) {
+                continue;
+            }
+
+            if (self::class === $method->getDeclaringClass()->name && ($returnType = $method->getReturnType()) && !$returnType->isBuiltin()) {
+                $services[self::class.'::'.$method->name] = '?'.$returnType->getName();
+            }
+        }
+
+        return $services;
+    }
+
+    /**
+     * @required
+     */
+    public function setContainer(ContainerInterface $container)
+    {
+        $this->container = $container;
+
+        if (\is_callable(array('parent', __FUNCTION__))) {
+            return parent::setContainer($container);
+        }
+    }
+}