locale_translate_file_attach_properties

locale_translate_file_attach_properties($file, array $options = array())

function locale_translate_file_attach_properties($file, array $options = array()) {
  // If $file is a file entity, convert it to a stdClass.
  if ($file instanceof FileInterface) {
    $file = (object) array(
      'filename' => $file->getFilename(),
      'uri' => $file->getFileUri(),
    );
  }

  // Extract project, version and language code from the file name. Supported:
  // {project}-{version}.{langcode}.po, {prefix}.{langcode}.po or {langcode}.po
  preg_match('!
    (                       # project OR project and version OR empty (group 1)
      ([a-z_]+)             # project name (group 2)
      \.                    # .
      |                     # OR
      ([a-z_]+)             # project name (group 3)
      \-                    # -
      ([0-9a-z\.\-\+]+)     # version (group 4)
      \.                    # .
      |                     # OR
    )                       # (empty)
    ([^\./]+)               # language code (group 5)
    \.                      # .
    po                      # po extension
    $!x', $file->filename, $matches);
  if (isset($matches[5])) {
    $file->project = $matches[2] . $matches[3];
    $file->version = $matches[4];
    $file->langcode = isset($options['langcode']) ? $options['langcode'] : $matches[5];
  }
  else {
    $file->langcode = LanguageInterface::LANGCODE_NOT_SPECIFIED;
  }
  return $file;
}