def solve(self):
self._send_command("(check-sat)")
ans = self._get_answer()
if ans == "sat":
return True
elif ans == "unsat":
return False
elif ans == "unknown":
raise SolverReturnedUnknownResultError
else:
raise UnknownSolverAnswerError("Solver returned: " + ans)
def solve(self, assumptions=None):
assert assumptions is None
self._send_command(SmtLibCommand(smtcmd.CHECK_SAT, []))
ans = self._get_answer()
if ans == "sat":
return True
elif ans == "unsat":
return False
elif ans == "unknown":
raise SolverReturnedUnknownResultError
else:
raise UnknownSolverAnswerError("Solver returned: " + ans)
def sequence_interpolant(self, formulas):
"""Returns a sequence interpolant for the conjunction of formulas, or
None if the problem is satisfiable.
"""
solver = SmtLibSolver(self.options[0], self.options[1], self.options[2], self.options[3], **self.options[4])
for f in formulas:
sorts = solver.to.get_types(f, custom_only=True)
for s in sorts:
if all(s not in ds for ds in solver.declared_sorts):
solver._declare_sort(s)
deps = f.get_free_variables()
for d in deps:
if all(d not in dv for dv in solver.declared_vars):
solver._declare_variable(d)
names = []
i = 0
for f in formulas:
self._send_named_assert_command(f, "IP_%d" % i, solver)
names.append("IP_%d" % i)
i += 1
solver._send_command(SmtLibCommand(smtcmd.CHECK_SAT, []))
ans = solver._get_answer()
if ans == "sat":
return None
elif ans == "unsat":
pass
elif ans == "unknown":
raise SolverReturnedUnknownResultError
else:
raise UnknownSolverAnswerError("Solver returned: " + ans)
solver._send_command(SmtLibCommand(smtcmd.GET_INTERPOLANTS, names))
res = solver.parser.get_interpolant_list(solver.solver_stdout)
solver._exit()
return res
def _check_success(self):
res = self._get_answer()
if res != "success":
raise UnknownSolverAnswerError("Solver returned: '%s'" % res)