def _AddEnumValues(descriptor, cls):
  """Sets class-level attributes for all enum fields defined in this message.

  Also exporting a class-level object that can name enum values.

  Args:
    descriptor: Descriptor object for this message type.
    cls: Class we're constructing for this message type.
  """
  for enum_type in descriptor.enum_types:
    setattr(cls, enum_type.name, enum_type_wrapper.EnumTypeWrapper(enum_type))
    for enum_value in enum_type.values:
      setattr(cls, enum_value.name, enum_value.number)
Sets class-level attributes for all enum fields defined in this message.

  Also exporting a class-level object that can name enum values.

  Args:
    descriptor: Descriptor object for this message type.
    cls: Class we're constructing for this message type.
  
deps/protobuf/python/google/protobuf/internal/python_message.py