<?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\FileResource;
  use Symfony\Component\Config\Util\XmlUtils;
  use Symfony\Component\Translation\Exception\InvalidResourceException;
  use Symfony\Component\Translation\Exception\NotFoundResourceException;
  use Symfony\Component\Translation\Exception\RuntimeException;
  use Symfony\Component\Translation\MessageCatalogue;
  
  /**
   * QtFileLoader loads translations from QT Translations XML files.
   *
   * @author Benjamin Eberlei <kontakt@beberlei.de>
   */
  class QtFileLoader implements LoaderInterface
  {
      /**
       * {@inheritdoc}
       */
      public function load($resource, string $locale, string $domain = 'messages')
      {
          if (!class_exists(XmlUtils::class)) {
              throw new RuntimeException('Loading translations from the QT format requires the Symfony Config component.');
          }
  
          if (!stream_is_local($resource)) {
              throw new InvalidResourceException(sprintf('This is not a local file "%s".', $resource));
          }
  
          if (!file_exists($resource)) {
              throw new NotFoundResourceException(sprintf('File "%s" not found.', $resource));
          }
  
          try {
              $dom = XmlUtils::loadFile($resource);
          } catch (\InvalidArgumentException $e) {
              throw new InvalidResourceException(sprintf('Unable to load "%s".', $resource), $e->getCode(), $e);
          }
  
          $internalErrors = libxml_use_internal_errors(true);
          libxml_clear_errors();
  
          $xpath = new \DOMXPath($dom);
          $nodes = $xpath->evaluate('//TS/context/name[text()="'.$domain.'"]');
  
          $catalogue = new MessageCatalogue($locale);
          if (1 == $nodes->length) {
              $translations = $nodes->item(0)->nextSibling->parentNode->parentNode->getElementsByTagName('message');
              foreach ($translations as $translation) {
                  $translationValue = (string) $translation->getElementsByTagName('translation')->item(0)->nodeValue;
  
                  if (!empty($translationValue)) {
                      $catalogue->set(
                          (string) $translation->getElementsByTagName('source')->item(0)->nodeValue,
                          $translationValue,
                          $domain
                      );
                  }
                  $translation = $translation->nextSibling;
              }
  
              if (class_exists(FileResource::class)) {
                  $catalogue->addResource(new FileResource($resource));
              }
          }
  
          libxml_use_internal_errors($internalErrors);
  
          return $catalogue;
      }
  }