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acc: add a maybe_accepting() method

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* spot/twa/acc.cc, spot/twa/acc.hh: Implement the new method, and
use it to implement inf_accepting().
* tests/python/accparse2.py: Add some tests.
This commit is contained in:
Alexandre Duret-Lutz 2017-05-30 18:04:57 +02:00
parent f7d14ab526
commit 78add1d44b
3 changed files with 54 additions and 13 deletions
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45
spot/twa/acc.cc
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@ -215,39 +215,52 @@ namespace spot
return false;
}
static bool
inf_eval(acc_cond::mark_t inf, const acc_cond::acc_word* pos)
static trival
partial_eval(acc_cond::mark_t infinitely_often,
acc_cond::mark_t always_present,
const acc_cond::acc_word* pos)
{
switch (pos->sub.op)
{
case acc_cond::acc_op::And:
{
auto sub = pos - pos->sub.size;
trival res = true;
while (sub < pos)
{
--pos;
if (!inf_eval(inf, pos))
return false;
res = res &&
partial_eval(infinitely_often, always_present, pos);
if (res.is_false())
return res;
pos -= pos->sub.size;
}
return true;
return res;
}
case acc_cond::acc_op::Or:
{
auto sub = pos - pos->sub.size;
trival res = false;
while (sub < pos)
{
--pos;
if (inf_eval(inf, pos))
return true;
res = res ||
partial_eval(infinitely_often, always_present, pos);
if (res.is_true())
return res;
pos -= pos->sub.size;
}
return false;
return res;
}
case acc_cond::acc_op::Inf:
return (pos[-1].mark & inf) == pos[-1].mark;
return (pos[-1].mark & infinitely_often) == pos[-1].mark;
case acc_cond::acc_op::Fin:
return true;
if (pos[-1].mark & always_present)
return false;
else if (pos[-1].mark & infinitely_often)
return trival::maybe();
else
return true;
case acc_cond::acc_op::FinNeg:
case acc_cond::acc_op::InfNeg:
SPOT_UNREACHABLE();
@ -310,13 +323,21 @@ namespace spot
return eval(inf, &back());
}
bool acc_cond::acc_code::inf_satisfiable(mark_t inf) const
trival acc_cond::acc_code::maybe_accepting(mark_t infinitely_often,
mark_t always_present) const
{
if (empty())
return true;
return inf_eval(inf, &back());
return partial_eval(infinitely_often | always_present,
always_present, &back());
}
bool acc_cond::acc_code::inf_satisfiable(mark_t inf) const
{
return !maybe_accepting(inf, 0U).is_false();
}
acc_cond::mark_t acc_cond::accepting_sets(mark_t inf) const
{
if (uses_fin_acceptance())