code: def process_grammars(self, grammars):
          
          for path in self.default_grammars:
              grammars.insert(0, open(os.path.relpath(os.path.join(os.path.dirname(os.path.abspath(__file__)),
                                                                   os.path.normcase(path)))))
          for fo in grammars:
              logging.debug("Processing grammar content of %s", fo.name)
              self.set_namespace(os.path.splitext(os.path.basename(fo.name))[0])
              for line in fo:
                  self.parse_line(line)
              self.handle_empty_line()
          self.resolve_xref()
          self.calculate_leaf_paths()
docs: Process provided grammars by parsing them into Python objects.