code: def fmt(self, fills):
          
          name = ',$$'.join(''.join(p).strip() for p in self.parsed)
          name = re.sub('\?(.)\?', '%(ws)s\\1%(ws)s', name) % fills
          return name.replace('$$', fills['nl']).replace('  ', ' ')
docs: Format identifier
          args:
              fills (dict): replacements
          returns:
              str (CSS)