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Filename : 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;
use Symfony\Contracts\Service\Attribute\SubscribedService;

/**
 * Implementation of ServiceSubscriberInterface that determines subscribed services from
 * method return types. Service ids are available as "ClassName::methodName".
 *
 * @author Kevin Bond <kevinbond@gmail.com>
 */
trait ServiceSubscriberTrait
{
    /** @var ContainerInterface */
    protected $container;

    /**
     * {@inheritdoc}
     */
    public static function getSubscribedServices(): array
    {
        $services = method_exists(get_parent_class(self::class) ?: '', __FUNCTION__) ? parent::getSubscribedServices() : [];
        $attributeOptIn = false;

        if (\PHP_VERSION_ID >= 80000) {
            foreach ((new \ReflectionClass(self::class))->getMethods() as $method) {
                if (self::class !== $method->getDeclaringClass()->name) {
                    continue;
                }

                if (!$attribute = $method->getAttributes(SubscribedService::class)[0] ?? null) {
                    continue;
                }

                if ($method->isStatic() || $method->isAbstract() || $method->isGenerator() || $method->isInternal() || $method->getNumberOfRequiredParameters()) {
                    throw new \LogicException(sprintf('Cannot use "%s" on method "%s::%s()" (can only be used on non-static, non-abstract methods with no parameters).', SubscribedService::class, self::class, $method->name));
                }

                if (!$returnType = $method->getReturnType()) {
                    throw new \LogicException(sprintf('Cannot use "%s" on methods without a return type in "%s::%s()".', SubscribedService::class, $method->name, self::class));
                }

                $serviceId = $returnType instanceof \ReflectionNamedType ? $returnType->getName() : (string) $returnType;

                if ($returnType->allowsNull()) {
                    $serviceId = '?'.$serviceId;
                }

                $services[$attribute->newInstance()->key ?? self::class.'::'.$method->name] = $serviceId;
                $attributeOptIn = true;
            }
        }

        if (!$attributeOptIn) {
            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) {
                    continue;
                }

                if (!($returnType = $method->getReturnType()) instanceof \ReflectionNamedType) {
                    continue;
                }

                if ($returnType->isBuiltin()) {
                    continue;
                }

                if (\PHP_VERSION_ID >= 80000) {
                    trigger_deprecation('symfony/service-contracts', '2.5', 'Using "%s" in "%s" without using the "%s" attribute on any method is deprecated.', ServiceSubscriberTrait::class, self::class, SubscribedService::class);
                }

                $services[self::class.'::'.$method->name] = '?'.($returnType instanceof \ReflectionNamedType ? $returnType->getName() : $returnType);
            }
        }

        return $services;
    }

    /**
     * @required
     *
     * @return ContainerInterface|null
     */
    public function setContainer(ContainerInterface $container)
    {
        $ret = null;
        if (method_exists(get_parent_class(self::class) ?: '', __FUNCTION__)) {
            $ret = parent::setContainer($container);
        }

        $this->container = $container;

        return $ret;
    }
}