def __eq__(self, other):
# check importent special case first
# %(x,y).(x:S & y:T|y) = prj2(S,T)
if isinstance(other, SymbolicLambda):
if not len(other.variable_list)==2:
return False
if isinstance(other.predicate, AConjunctPredicate):
belong_pred0 = other.predicate.children[0]
belong_pred1 = other.predicate.children[1]
if isinstance(belong_pred0, AMemberPredicate) and isinstance(belong_pred1, AMemberPredicate):
x = other.variable_list[0].idName
y = other.variable_list[1].idName
xx = belong_pred0.children[0]
yy = belong_pred1.children[0]
if USE_RPYTHON_CODE:
from rpython_interp import interpret
else:
from interp import interpret
if isinstance(xx, AIdentifierExpression) and xx.idName==x:
S = interpret(belong_pred0.children[1], self.env)
if isinstance(yy, AIdentifierExpression) and yy.idName==y:
T = interpret(belong_pred1.children[1], self.env)
if isinstance(other.expression, AIdentifierExpression): # else: maybe equal.
try:
if self.left_set==S and self.right_set==T and y==other.expression.idName:
return True
except NameError:
pass # maybe equal. use brute-force in symbolic set
return SymbolicSet.__eq__(self, other)
def __eq__(self, other):
# TODO: handle empty set and maybe more sp. cases
return SymbolicSet.__eq__(self, other)
