Changed normal precedence calculation.

This commit is contained in:
Dave Halter
2014-11-06 03:47:42 +01:00
parent fae798adfe
commit d58046f38f
2 changed files with 27 additions and 30 deletions

View File

@@ -203,14 +203,7 @@ class Evaluator(object):
types = list(precedence.factor_calculate(self, types, operator))
return types
else:
if element.children[0] == 'not':
left = []
operator, right = element.children
else:
left, operator, right = element.children
left = self.eval_element(left)
return precedence.calculate(self, left, operator,
self.eval_element(right))
return precedence.calculate_children(self, element.children)
def _eval_atom(self, atom):
"""

View File

@@ -218,27 +218,30 @@ def _literals_to_types(evaluator, result):
return list(set(result))
def process_children(evaluator, children):
#first = children[0]
#if isinstance(first,
operator = precedence.operator
lazy_right = lambda: process_precedence_element(evaluator, precedence.right)
# handle lazy evaluation of and/or here.
if operator in ('and', 'or'):
left_bools = set([left.py__bool__() for left in left_objs])
if left_bools == set([True]):
if operator == 'and':
return lazy_right()
else:
return left_objs
elif left_bools == set([False]):
if operator == 'and':
return left_objs
else:
return lazy_right()
# Otherwise continue, because of uncertainty.
return calculate(evaluator, left_objs, precedence.operator,
lazy_right())
def calculate_children(evaluator, children):
"""
Calculate a list of children with operators.
"""
iterator = iter(children)
types = evaluator.eval_element(next(iterator))
for operator in iterator:
right = next(iterator)
if pr.is_node(operator, 'comp_op'): # not in / is not
operator = ' '.join(str(c.value) for c in operator.children)
# handle lazy evaluation of and/or here.
if operator in ('and', 'or'):
left_bools = set([left.py__bool__() for left in types])
if left_bools == set([True]):
if operator == 'and':
types = evaluator.eval_element(right)
elif left_bools == set([False]):
if operator != 'and':
types = evaluator.eval_element(right)
# Otherwise continue, because of uncertainty.
types = calculate(evaluator, types, operator,
evaluator.eval_element(right))
return types
def calculate(evaluator, left_result, operator, right_result):
@@ -273,7 +276,8 @@ def factor_calculate(evaluator, types, operator):
if value is None: # Uncertainty.
return
yield keyword_from_value(not value)
yield typ
else:
yield typ
def _is_number(obj):