code: def _receive(self, root, directory, dirs, files, include, exclude):
          
  
          self._received += 1
  
          if not self.symlinks:
              where = root + os.path.sep + directory + os.path.sep
              files = [
                  file_name for file_name in files
                  if not os.path.islink(where + file_name)
              ]
  
          include = FileSetState("Include", directory, include, None
                                 if include else self.include)
          exclude = FileSetState("Exclude", directory, exclude, None
                                 if exclude else self.exclude)
  
          if exclude.matches_all_files_all_subdirs():
              # Exclude everything and do no traverse any subdirectories
              del dirs[0:]
              matched = set()
          else:
              if include.no_possible_matches_in_subdirs():
                  # Do no traverse any subdirectories
                  del dirs[0:]
              matched = include.match(set(files))
              matched -= exclude.match(matched)
  
          return matched, include, exclude
docs: Internal function processing each yield from os.walk.