def _to_expr(l: Label, sig_by_name: dict):
expr = sympy.true
for sig, val in l.items():
sig_by_name[sig.name] = sig
s = sympy.Symbol(str(sig))
expr = (expr & s) if val else (expr & ~s)
return expr
def __getitem__(self, key:Label):
if not isinstance(key, Label):
raise TypeError(key)
indices = [v for (l, v) in self._value_by_label
if set(l.items()).issubset(set(key.items()))]
if len(indices) == 0:
raise KeyError(key)
assert len(indices) == 1, 'return value is not unique: %s: %s' % (str(key), str(indices))
return indices[0]
def smt_out(smt_m: str, i_o: Label, inputs: Iterable[Signal],
descr_by_output: Dict[Signal, FuncDesc]) -> str:
args_dict = build_tau_args_dict(inputs, smt_m, i_o)
conjuncts = []
for sig, val in i_o.items():
out_desc = descr_by_output.get(sig)
if out_desc is None:
continue
condition_on_out = call_func(out_desc, args_dict)
if val is False:
condition_on_out = op_not(condition_on_out)
conjuncts.append(condition_on_out)
return op_and(conjuncts)