def do_expression(cls, data, ctx=None):
if ctx:
for n in data:
if isinstance(n, Variable):
n.ctx = ctx
it = iter(data)
first, res = next(it), next(it)
while True:
try:
op = OPRT.get(res, None)
if op:
second = next(it)
first = op(cls.prepare( first ), cls.prepare( second ))
if op == OPRT['and'] and not first:
raise StopIteration
elif op == OPRT['or'] and first:
raise StopIteration
res = next(it)
except StopIteration:
break
return first
def value(self):
it = iter(self.data)
try:
first = next(it)
while True:
res = next(it)
op = OPRT.get(res.strip(), None)
if op:
second = next(it)
first = op(first, second)
if op == OPRT['and'] and not first:
raise StopIteration
elif op == OPRT['or'] and first:
raise StopIteration
except StopIteration:
while isinstance(first, Variable):
first = first.value
return first
def value(self):
it = iter(self.data)
try:
first = next(it)
while True:
res = next(it)
op = OPRT.get(res.strip(), None)
if op:
second = next(it)
first = op(first, second)
if op == OPRT['and'] and not first:
raise StopIteration
elif op == OPRT['or'] and first:
raise StopIteration
except StopIteration:
while isinstance(first, Variable):
first = first.value
return first
