def test_two_items_causes_completion(self):
singular_sink = SingularSink()
transduce(Transducer,
sending(),
[23, 78],
init=singular_sink())
self.assertTrue(singular_sink.has_value)
def test_two_items_returns_two_element_list(self):
collection = CollectingSink()
transduce(Transducer,
sending(),
[23, 78],
init=collection())
self.assertEqual(list(collection), [23, 78])
def test_zero_items_returns_initial_empty_collection(self):
collection = CollectingSink()
transduce(Transducer,
sending(),
empty_iter(),
init=collection())
self.assertEqual(len(collection), 0)
def transduce(transducer, target=UNSET):
reducer = transducer(sending())
accumulator = target if target is not UNSET else reducer.initial()
try:
while True:
item = (yield)
accumulator = reducer.step(accumulator, item)
if isinstance(accumulator, Reduced):
accumulator = accumulator.value
break
assert accumulator is target
except GeneratorExit:
pass
assert accumulator is target
return reducer.complete(accumulator)
def transduce(transducer, target=UNSET):
reducer = transducer(sending())
accumulator = target if target is not UNSET else reducer.initial()
try:
while True:
item = (yield)
accumulator = reducer.step(accumulator, item)
if isinstance(accumulator, Reduced):
accumulator = accumulator.value
break
assert accumulator is target
except GeneratorExit:
pass
assert accumulator is target
return reducer.complete(accumulator)
def test_sending_to_non_sink_raises_attribute_error(self):
with self.assertRaises(AttributeError):
transduce(Transducer,
sending(),
(23, 78),
init=set())
