def _get_solver_class(self,
solver_list,
solver_type,
preference_list,
default_logic,
name=None,
logic=None):
if len(solver_list) == 0:
raise NoSolverAvailableError("No %s is available" % solver_type)
logic = convert_logic_from_string(logic)
if name is not None:
if name not in solver_list:
raise NoSolverAvailableError("%s '%s' is not available" % \
(solver_type, name))
if logic is not None and \
name not in self._filter_solvers(solver_list, logic=logic):
raise NoSolverAvailableError(
"%s '%s' does not support logic %s" %
(solver_type, name, logic))
SolverClass = solver_list[name]
if logic is None:
try:
logic = most_generic_logic(SolverClass.LOGICS)
except NoLogicAvailableError:
if default_logic in SolverClass.LOGICS:
logic = default_logic
else:
raise NoLogicAvailableError(
"Cannot automatically select a logic")
closer_logic = get_closer_logic(SolverClass.LOGICS, logic)
return SolverClass, closer_logic
if logic is None:
logic = default_logic
solvers = self._filter_solvers(solver_list, logic=logic)
if solvers is not None and len(solvers) > 0:
# Pick the first solver based on preference list
SolverClass = self._pick_favorite(preference_list, solver_list,
solvers)
closer_logic = get_closer_logic(SolverClass.LOGICS, logic)
return SolverClass, closer_logic
else:
raise NoSolverAvailableError("No %s is available for logic %s" %
(solver_type, logic))
def get_quantifier_eliminator(self, name=None):
if len(self._all_qelims) == 0:
raise NoSolverAvailableError(
"No quantifier eliminator is available")
if name is None:
QElimClass = self.pick_favorite_qelim(self._all_qelims)
elif name in self._all_qelims:
QElimClass = self._all_qelims[name]
else:
raise NoSolverAvailableError("No quantifier eliminator %s" % name)
return QElimClass(self.environment)
def Solver(name: str, logic: tp.Optional[logics.Logic] = None) -> SolverT:
'''
Convience function for building a pysmt solver object with a switch backend.
Similar to `pysmt.shortcuts.Solver`.
'''
try:
cls = SWITCH_SOLVERS[name]
except KeyError:
raise NoSolverAvailableError(
f"Solver '{name}' is not available") from None
if isinstance(logic, str):
logic = logics.convert_logic_from_string(logic)
elif logic is None:
# Try to use the most general logic supported
try:
logic = logics.most_generic_logic(cls.LOGICS)
except NoLogicAvailableError:
# supported logics do not have a single "upper bound"
# Check for some reasonable ones
if logics.QF_UFLIRA in cls.LOGICS:
logic = logics.QF_UFLIRA
elif logics.QF_AUFBV in cls.LOGICS:
logic = logics.QF_AUFBV
else:
# use the first one
logic = cls.LOGICS[0]
return cls(environment=get_env(), logic=logic)
def _pick_favorite(self, preference_list, solver_list, solvers):
for candidate in preference_list:
if candidate in solvers:
return solver_list[candidate]
raise NoSolverAvailableError(
"Cannot find a matching solver in the preference list: %s " %
solvers)
def pick_favorite_solver(self, solvers):
for candidate in self.solver_preference_list:
if candidate in solvers:
return self._all_solvers[candidate]
raise NoSolverAvailableError(
"Cannot find a matching solver in the preference list: %s " %
solvers)
def get_solver(self, quantified=False, name=None, logic=None):
assert quantified is False or logic is None, \
"Cannot specify both quantified and logic."
if quantified is True:
logic = self.default_logic.get_quantified_version
if name is not None:
if name in self._all_solvers:
if logic is None:
SolverClass = self._all_solvers[name]
logic = most_generic_logic(SolverClass.LOGICS)
else:
if name in self.all_solvers(logic=logic):
SolverClass = self._all_solvers[name]
else:
raise NoSolverAvailableError("Solver '%s' does not" \
" support logic %s" %
(name, logic))
closer_logic = get_closer_logic(SolverClass.LOGICS, logic)
return SolverClass(environment=self.environment,
logic=closer_logic,
options=None)
else:
raise NoSolverAvailableError("Solver %s is not available" %
name)
if logic is None:
logic = self.default_logic
solvers = self.all_solvers(logic=logic)
if solvers is not None and len(solvers) > 0:
# Pick the first solver based on preference list
SolverClass = self.pick_favorite_solver(solvers)
closer_logic = get_closer_logic(SolverClass.LOGICS, logic)
return SolverClass(environment=self.environment,
logic=closer_logic,
options=None)
else:
raise NoSolverAvailableError("No solver is available for logic %s" %\
logic)
def pick_favorite_qelim(self, qelims):
for candidate in self.qelim_preference_list:
if candidate in qelims:
return self._all_qelims[candidate]
raise NoSolverAvailableError("Cannot find a matching quantifier " \
"eliminator in the preference list")
