<?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\Component\Translation\Loader;
  
  use Symfony\Component\Config\Resource\DirectoryResource;
  use Symfony\Component\Translation\Exception\InvalidResourceException;
  use Symfony\Component\Translation\Exception\NotFoundResourceException;
  use Symfony\Component\Translation\MessageCatalogue;
  
  /**
   * IcuResFileLoader loads translations from a resource bundle.
   *
   * @author stealth35
   */
  class IcuResFileLoader implements LoaderInterface
  {
      /**
       * {@inheritdoc}
       */
      public function load($resource, string $locale, string $domain = 'messages')
      {
          if (!stream_is_local($resource)) {
              throw new InvalidResourceException(sprintf('This is not a local file "%s".', $resource));
          }
  
          if (!is_dir($resource)) {
              throw new NotFoundResourceException(sprintf('File "%s" not found.', $resource));
          }
  
          try {
              $rb = new \ResourceBundle($locale, $resource);
          } catch (\Exception $e) {
              $rb = null;
          }
  
          if (!$rb) {
              throw new InvalidResourceException(sprintf('Cannot load resource "%s".', $resource));
          } elseif (intl_is_failure($rb->getErrorCode())) {
              throw new InvalidResourceException($rb->getErrorMessage(), $rb->getErrorCode());
          }
  
          $messages = $this->flatten($rb);
          $catalogue = new MessageCatalogue($locale);
          $catalogue->add($messages, $domain);
  
          if (class_exists(DirectoryResource::class)) {
              $catalogue->addResource(new DirectoryResource($resource));
          }
  
          return $catalogue;
      }
  
      /**
       * Flattens an ResourceBundle.
       *
       * The scheme used is:
       *   key { key2 { key3 { "value" } } }
       * Becomes:
       *   'key.key2.key3' => 'value'
       *
       * This function takes an array by reference and will modify it
       *
       * @param \ResourceBundle $rb       The ResourceBundle that will be flattened
       * @param array           $messages Used internally for recursive calls
       * @param string|null     $path     Current path being parsed, used internally for recursive calls
       *
       * @return array
       */
      protected function flatten(\ResourceBundle $rb, array &$messages = [], ?string $path = null)
      {
          foreach ($rb as $key => $value) {
              $nodePath = $path ? $path.'.'.$key : $key;
              if ($value instanceof \ResourceBundle) {
                  $this->flatten($value, $messages, $nodePath);
              } else {
                  $messages[$nodePath] = $value;
              }
          }
  
          return $messages;
      }
  }