<?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\Translation\Exception\InvalidResourceException;
  
  /**
   * JsonFileLoader loads translations from an json file.
   *
   * @author singles
   */
  class JsonFileLoader extends FileLoader
  {
      /**
       * {@inheritdoc}
       */
      protected function loadResource(string $resource)
      {
          $messages = [];
          if ($data = file_get_contents($resource)) {
              $messages = json_decode($data, true);
  
              if (0 < $errorCode = json_last_error()) {
                  throw new InvalidResourceException('Error parsing JSON: '.$this->getJSONErrorMessage($errorCode));
              }
          }
  
          return $messages;
      }
  
      /**
       * Translates JSON_ERROR_* constant into meaningful message.
       */
      private function getJSONErrorMessage(int $errorCode): string
      {
          switch ($errorCode) {
              case \JSON_ERROR_DEPTH:
                  return 'Maximum stack depth exceeded';
              case \JSON_ERROR_STATE_MISMATCH:
                  return 'Underflow or the modes mismatch';
              case \JSON_ERROR_CTRL_CHAR:
                  return 'Unexpected control character found';
              case \JSON_ERROR_SYNTAX:
                  return 'Syntax error, malformed JSON';
              case \JSON_ERROR_UTF8:
                  return 'Malformed UTF-8 characters, possibly incorrectly encoded';
              default:
                  return 'Unknown error';
          }
      }
  }