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Edit File: ServiceLocatorTrait.php

<?php
namespace MailPoetVendor\Symfony\Contracts\Service;
if (!defined('ABSPATH')) exit;
use MailPoetVendor\Psr\Container\ContainerExceptionInterface;
use MailPoetVendor\Psr\Container\NotFoundExceptionInterface;
// Help opcache.preload discover always-needed symbols
\class_exists(ContainerExceptionInterface::class);
\class_exists(NotFoundExceptionInterface::class);
trait ServiceLocatorTrait
{
 private $factories;
 private $loading = [];
 private $providedTypes;
 public function __construct(array $factories)
 {
 $this->factories = $factories;
 }
 public function has(string $id)
 {
 return isset($this->factories[$id]);
 }
 public function get(string $id)
 {
 if (!isset($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]);
 }
 }
 public function getProvidedServices() : array
 {
 if (null === $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
 {
 };
 }
}

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