def __clean_cnf(cnf, is_first_order):
cnf = Braces.flatten(cnf, is_first_order)
clauses = set()
for disjunct_text in cnf.split(LogicOperator.Conjuction):
disjunct_text = disjunct_text.replace(Braces.Left, "")\
.replace(Braces.Right, "")
if len(disjunct_text) == 0:
continue
disjunct_text = disjunct_text.replace(Braces.FO_Left, Braces.Left)\
.replace(Braces.FO_Right, Braces.Right)
disjunct = frozenset(symbol.strip() for symbol in
disjunct_text.split(LogicOperator.Disjunction))
if not is_disjunction_tautology(disjunct):
clauses.add(disjunct)
return __clean_clauses(clauses)
def __clean_cnf(cnf, is_first_order):
cnf = Braces.flatten(cnf, is_first_order)
clauses = set()
for disjunct_text in cnf.split(LogicOperator.Conjuction):
disjunct_text = disjunct_text.replace(Braces.Left, "")\
.replace(Braces.Right, "")
if len(disjunct_text) == 0:
continue
disjunct_text = disjunct_text.replace(Braces.FO_Left, Braces.Left)\
.replace(Braces.FO_Right, Braces.Right)
disjunct = frozenset(
symbol.strip()
for symbol in disjunct_text.split(LogicOperator.Disjunction))
if not is_disjunction_tautology(disjunct):
clauses.add(disjunct)
return __clean_clauses(clauses)
