def map(self, func):
func = to_unary(func)
if self:
res = func(self._value)
ensure(not isinstance(res, Opt),
lambda: 'map: result Opt not expected',
stack_level=2)
return Opt(res)
else:
return Opt.none()
def sort_desc(self, key=identity):
key = to_unary(key)
return sorted(self._iterable, key=key, reverse=True)
def _adjust_selectors(key_selector, value_selector):
if key_selector is None and value_selector is None:
return operator.itemgetter(0), operator.itemgetter(1)
else:
return to_unary(key_selector) or identity, to_unary(
value_selector) or identity
def sort(self, key=identity):
key = to_unary(key)
return sorted(self._iterable, key=key)
def replace_if(self, pred, new_value):
pred = to_unary(pred)
return self.map(lambda item: new_value if pred(item) else item)
def drop_until(self, pred):
pred = to_unary(pred)
return self.drop_while(negate(pred))
def take_until(self, pred):
pred = to_unary(pred)
return self.take_while(negate(pred))
def drop_while(self, pred):
pred = to_unary(pred)
return itertools.dropwhile(pred, self._iterable)
def take_while(self, pred):
pred = to_unary(pred)
return itertools.takewhile(pred, self._iterable)
def drop_if(self, pred):
pred = to_unary(pred)
return self.filter(negate(pred))
def filter(self, pred):
pred = to_unary(pred)
return filter(pred, self._iterable)
def map(self, func):
func = to_unary(func)
return map(func, self._iterable)
def flat_map(self, func):
func = to_unary(func)
if self:
return Opt(func(self._value))
else:
return Opt.none()
def filter(self, pred):
pred = to_unary(pred)
if self.matches(pred):
return self
else:
return Opt.none()
def matches(self, pred):
pred = to_unary(pred)
return self and pred(self._value)
