def __getitem__(cls, val):
if isinstance(val, Field):
return val
elif Field in getattr(val, "__mro__", {}):
return val()
elif Structure in getattr(val, "__mro__", {}):
return ClassReference(val)
elif is_function_returning_field(val):
return val()
elif val is None:
return NoneField()
else:
def get_state(value):
raise TypeError(
"pickling of implicit wrappers for non-Typedpy fields are unsupported"
)
if not isinstance(val, type):
raise TypeError(
"Unsupported field type in definition: {}".format(wrap_val(val))
)
the_class = val.__name__
if the_class in _FieldMeta._registry:
return _FieldMeta._registry[the_class]
short_hash = hashlib.sha256(the_class.encode("utf-8")).hexdigest()[:8]
new_name = "Field_{}_{}".format(the_class, short_hash)
class_as_field = create_typed_field(new_name, val)
class_as_field.__getstate__ = get_state
_FieldMeta._registry[the_class] = class_as_field
return class_as_field()
def __manage_uniqueness_for_field__(self, instance, value):
if not getattr(instance, "_instantiated", False):
return
field_name = getattr(self, "_name")
structure_class_name = instance.__class__.__name__
all_instances_by_struct_name = getattr(
self, "_ALL_INSTANCES", defaultdict(dict)
)
instance_by_value_for_current_struct = all_instances_by_struct_name[
structure_class_name
]
if (
getattr(self, MUST_BE_UNIQUE, False)
and len(instance_by_value_for_current_struct)
< MAX_NUMBER_OF_INSTANCES_TO_VERIFY_UNIQUENESS
):
hash_of_field_val = value.__hash__()
if (
instance_by_value_for_current_struct.get(hash_of_field_val, instance)
!= instance
):
raise ValueError(
"Instance copy of field {} in {}, which is defined as unique. Instance is {}".format(
field_name, structure_class_name, wrap_val(value)
)
)
if hash_of_field_val not in instance_by_value_for_current_struct:
instance_by_value_for_current_struct[hash_of_field_val] = instance
def _validate(self, value):
def err_prefix():
return "{}: ".format(self._name) if self._name else ""
if not isinstance(value, self._ty) and value is not None:
raise TypeError(
"{}Expected {}; Got {}".format(err_prefix(), self._ty, wrap_val(value))
)
def _try_default_value(self, default):
try:
self.__set__(Structure(), default)
except Exception as e:
raise e.__class__(
"Invalid default value: {}; Reason: {}".format(
wrap_val(default), str(e)
)
) from e
def __set__(self, instance, value):
super().__set__(instance, value)
try:
datetime.strptime(value, "%H:%M:%S")
except ValueError as ex:
raise ValueError("{}: Got {}; {}".format(self._name, wrap_val(value), ex.args[0]))
def __set__(self, instance, value):
if not HostName._host_name_re.match(value):
raise ValueError("{}: Got {}; wrong format for hostname".format(self._name, wrap_val(value)))
components = value.split(".")
for component in components:
if len(component) > 63:
raise ValueError("{}: Got {}; wrong format for hostname".format(self._name, wrap_val(value)))
super().__set__(instance, value)
def __set__(self, instance, value):
if IPV4._ipv4_re.match(value) and all(
0 <= int(component) <= 255 for component in value.split(".")
):
super().__set__(instance, value)
else:
raise ValueError("{}: Got {}; wrong format for IP version 4".format(self._name, wrap_val(value)))
def __set__(self, instance, value):
if isinstance(value, str):
as_datetime = self.deserialize(value)
super().__set__(instance, as_datetime)
elif isinstance(value, datetime):
super().__set__(instance, value)
else:
raise TypeError("{}: Got {}; Expected datetime or str".format(self._name, wrap_val(value)))
def deserialize(self, value):
try:
return datetime.strptime(value, self._datetime_format)
except ValueError as ex:
raise ValueError("{}: Got {}; {}".format(self._name, wrap_val(value), str(ex))) from ex
