code: protected function indentationMode(string $line): int
    {
      $mode = 0;
  
      $line = trim($line);
  
      if (substr($line, 0, 5)=='begin' || substr($line, 0, 2)=='if' || substr($line, -4, 4)=='loop')
      {
        $mode |= self::C_INDENT_INCREMENT_AFTER;
      }
  
      if (substr($line, 0, 3)=='end')
      {
        $mode |= self::C_INDENT_DECREMENT_BEFORE;
      }
  
      return $mode;
    }
docs: {@inheritdoc}