def validate_element(element, state, validators):
"""Apply a set of validators to an element.
:param element: a `~flatland.Element`
:param state: may be None, an optional value of supplied to
``element.validate``
:param validators: an iterable of validation functions
:return: a truth value
If validators is empty or otherwise false, a fallback validation
of ``not element.is_empty`` will be used. Empty but optional
elements are considered valid.
Emits :class:`flatland.signals.validator_validated` after each
validator is tested.
"""
if element.is_empty and element.optional:
return True
if not validators:
valid = not element.is_empty
if validator_validated.receivers:
validator_validated.send(NotEmpty,
element=element,
state=state,
result=valid)
return valid
for fn in validators:
valid = fn(element, state)
if validator_validated.receivers:
validator_validated.send(fn,
element=element,
state=state,
result=valid)
if valid is None:
return False
elif valid is Skip:
return True
elif not valid or valid is SkipAll:
return valid
return True
def validate_element(element, state, validators):
"""Apply a set of validators to an element.
:param element: a `~flatland.Element`
:param state: may be None, an optional value of supplied to
``element.validate``
:param validators: an iterable of validation functions
:return: a truth value
If validators is empty or otherwise false, a fallback validation
of ``not element.is_empty`` will be used. Empty but optional
elements are considered valid.
Emits :class:`flatland.signals.validator_validated` after each
validator is tested.
"""
if element.is_empty and element.optional:
return True
if not validators:
valid = not element.is_empty
if validator_validated.receivers:
validator_validated.send(
NotEmpty, element=element, state=state, result=valid)
return valid
for fn in validators:
valid = fn(element, state)
if validator_validated.receivers:
validator_validated.send(
fn, element=element, state=state, result=valid)
if valid is None:
return False
elif valid is Skip:
return True
elif not valid or valid is SkipAll:
return valid
return True