_locale_parse_js_file

_locale_parse_js_file($filepath)

function _locale_parse_js_file($filepath) {
  // The file path might contain a query string, so make sure we only use the
  // actual file.
  $parsed_url = UrlHelper::parse($filepath);
  $filepath = $parsed_url['path'];

  // If there is still a protocol component in the path, reject that.
  if (strpos($filepath, ':')) {
    throw new Exception('Only local files should be passed to _locale_parse_js_file().');
  }

  // Load the JavaScript file.
  $file = file_get_contents($filepath);

  // Match all calls to Drupal.t() in an array.
  // Note: \s also matches newlines with the 's' modifier.
  preg_match_all('~
    [^\w]Drupal\s*\.\s*t\s*                       # match "Drupal.t" with whitespace
    \(\s*                                         # match "(" argument list start
    (' . LOCALE_JS_STRING . ')\s*                 # capture string argument
    (?:,\s*' . LOCALE_JS_OBJECT . '\s*            # optionally capture str args
      (?:,\s*' . LOCALE_JS_OBJECT_CONTEXT . '\s*) # optionally capture context
    ?)?                                           # close optional args
    [,\)]                                         # match ")" or "," to finish
    ~sx', $file, $t_matches);

  // Match all Drupal.formatPlural() calls in another array.
  preg_match_all('~
    [^\w]Drupal\s*\.\s*formatPlural\s*  # match "Drupal.formatPlural" with whitespace
    \(                                  # match "(" argument list start
    \s*.+?\s*,\s*                       # match count argument
    (' . LOCALE_JS_STRING . ')\s*,\s*   # match singular string argument
    (                             # capture plural string argument
      (?:                         # non-capturing group to repeat string pieces
        (?:
          \'                      # match start of single-quoted string
          (?:\\\\\'|[^\'])*       # match any character except unescaped single-quote
          @count                  # match "@count"
          (?:\\\\\'|[^\'])*       # match any character except unescaped single-quote
          \'                      # match end of single-quoted string
          |
          "                       # match start of double-quoted string
          (?:\\\\"|[^"])*         # match any character except unescaped double-quote
          @count                  # match "@count"
          (?:\\\\"|[^"])*         # match any character except unescaped double-quote
          "                       # match end of double-quoted string
        )
        (?:\s*\+\s*)?             # match "+" with possible whitespace, for str concat
      )+                          # match multiple because we supports concatenating strs
    )\s*                          # end capturing of plural string argument
    (?:,\s*' . LOCALE_JS_OBJECT . '\s*          # optionally capture string args
      (?:,\s*' . LOCALE_JS_OBJECT_CONTEXT . '\s*)?  # optionally capture context
    )?
    [,\)]
    ~sx', $file, $plural_matches);

  $matches = array();

  // Add strings from Drupal.t().
  foreach ($t_matches[1] as $key => $string) {
    $matches[] = array(
      'source' => _locale_strip_quotes($string),
      'context' => _locale_strip_quotes($t_matches[2][$key]),
    );
  }

  // Add string from Drupal.formatPlural().
  foreach ($plural_matches[1] as $key => $string) {
    $matches[] = array(
      'source' => _locale_strip_quotes($string) . LOCALE_PLURAL_DELIMITER . _locale_strip_quotes($plural_matches[2][$key]),
      'context' => _locale_strip_quotes($plural_matches[3][$key]),
    );
  }

  // Loop through all matches and process them.
  foreach ($matches as $match) {
    $source = \Drupal::service('locale.storage')->findString($match);

    if (!$source) {
      // We don't have the source string yet, thus we insert it into the
      // database.
      $source = \Drupal::service('locale.storage')->createString($match);
    }

    // Besides adding the location this will tag it for current version.
    $source->addLocation('javascript', $filepath);
    $source->save();
  }
}