code: def generate_topology(non_omm_topology, non_element_types=None,
          residues=None):
      
      if non_element_types is None:
          non_element_types = set()
  
      if isinstance(non_omm_topology, pmd.Structure):
          return _topology_from_parmed(non_omm_topology, non_element_types)
      elif has_mbuild:
          mb = import_('mbuild')
          if (non_omm_topology, mb.Compound):
              pmdCompoundStructure = non_omm_topology.to_parmed(residues=residues)
              return _topology_from_parmed(pmdCompoundStructure, non_element_types)
      else:
          raise FoyerError('Unknown topology format: {}\n'
                           'Supported formats are: '
                           '"parmed.Structure", '
                           '"mbuild.Compound", '
                           '"openmm.app.Topology"'.format(non_omm_topology))
docs: Create an OpenMM Topology from another supported topology structure.