code: def highlight_block(self, text):
          
          text = to_text_string(text)
          if text.startswith(("c", "C")):
              self.setFormat(0, len(text), self.formats["comment"])
              self.highlight_spaces(text)
          else:
              FortranSH.highlight_block(self, text)
              self.setFormat(0, 5, self.formats["comment"])
              self.setFormat(73, max([73, len(text)]),
                             self.formats["comment"])
docs: Implement highlight specific for Fortran77.