<?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;

// Help opcache.preload discover always-needed symbols
class_exists(ContainerExceptionInterface::class);
class_exists(NotFoundExceptionInterface::class);

/**
 * A trait to help implement ServiceProviderInterface.
 *
 * @author Robin Chalas <robin.chalas@gmail.com>
 * @author Nicolas Grekas <p@tchwork.com>
 */
trait ServiceLocatorTrait
{
    private array $factories;
    private array $loading = [];
    private array $providedTypes;

    /**
     * @param array<string, callable> $factories
     */
    public function __construct(array $factories)
    {
        $this->factories = $factories;
    }

    public function has(string $id): bool
    {
        return isset($this->factories[$id]);
    }

    public function get(string $id): mixed
    {
        if (!isset($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]);
        }
    }

    public function getProvidedServices(): array
    {
        if (!isset($this->providedTypes)) {
            $this->providedTypes = [];

            foreach ($this->factories as $name => $factory) {
                if (!\is_callable($factory)) {
                    $this->providedTypes[$name] = '?';
                } else {
                    $type = (new \ReflectionFunction($factory))->getReturnType();

                    $this->providedTypes[$name] = $type ? ($type->allowsNull() ? '?' : '').($type instanceof \ReflectionNamedType ? $type->getName() : $type) : '?';
                }
            }
        }

        return $this->providedTypes;
    }

    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 {
        };
    }
}

.NET Framework

Project Request

ProjectC

Vehicle Maintenance

Movie Navigator

Customers Exchange

ATM

.NET Core

Mail Daemon

Custom

Buns of code

PHP

Mediabox

Loan Castle

Content Management

Laravel

Phone Check

Frontend

Forex Wall

Business projects

Certification Center

Amerikas Auto

Pet projects

Geolocation Assistant

Web Dynamics

Blackball

Good old times

DOS Clock

BrainOut

Airport Administrator

Atomizer

Mediabox