code: def parse(self, filename):
          
          path = os.path.abspath(filename)
  
          # Only PAW supports XML at present.
          if filename.endswith(".xml"):
              return PawXmlSetup(path)
  
          ppdesc = self.read_ppdesc(path)
  
          if ppdesc is None:
              logger.critical("Cannot find ppdesc in %s" % path)
              return None
  
          psp_type = ppdesc.psp_type
  
          parsers = {
              "FHI": NcAbinitHeader.fhi_header,
              "GTH": NcAbinitHeader.gth_header,
              "TM": NcAbinitHeader.tm_header,
              "Teter": NcAbinitHeader.tm_header,
              "HGH": NcAbinitHeader.hgh_header,
              "HGHK": NcAbinitHeader.hgh_header,
              "ONCVPSP": NcAbinitHeader.oncvpsp_header,
              "PAW_abinit_text": PawAbinitHeader.paw_header,
          }
  
          try:
              header = parsers[ppdesc.name](path, ppdesc)
          except Exception:
              raise self.Error(path + ":\n" + straceback())
  
          if psp_type == "NC":
              pseudo = NcAbinitPseudo(path, header)
          elif psp_type == "PAW":
              pseudo = PawAbinitPseudo(path, header)
          else:
              raise NotImplementedError("psp_type not in [NC, PAW]")
  
          return pseudo
docs: Read and parse a pseudopotential file. Main entry point for client code.
  
          Returns:
              pseudopotential object or None if filename is not a valid pseudopotential file.