def most_generic_logic(logics):
"""Given a set of logics, return the most generic one.
If a unique most generic logic does not exists, throw an error.
"""
res = [l for l in logics if all(l >= x for x in logics)]
if len(res) != 1:
raise NoLogicAvailableError("Could not find the most generic "
"logic for %s." % str(logics))
return res[0]
def get_closer_logic(supported_logics, logic):
"""
Returns the smaller supported logic that is greater or equal to
the given logic. Raises NoLogicAvailableError if the solver
does not support the given logic.
"""
res = [l for l in supported_logics if logic <= l]
if len(res) == 0:
raise NoLogicAvailableError("Logic %s is not supported" % logic)
return min(res)
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))