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acc: fix is_dnf()

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A Fin() terms with multiple sets should not appear under an And.

* src/tgba/acc.cc (is_dnf): Fix it.
* src/tgbatest/acc.cc, src/tgbatest/acc.test: Augment test case.
This commit is contained in:
Alexandre Duret-Lutz 2015-03-05 08:44:23 +01:00
parent 518de8d5eb
commit b71e6addd2
3 changed files with 31 additions and 15 deletions
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11
src/tgba/acc.cc
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@ -464,10 +464,11 @@ namespace spot
bool acc_cond::acc_code::is_dnf() const
{
if (empty())
if (empty() || size() == 2)
return true;
auto pos = &back();
auto start = &front();
auto and_scope = pos + 1;
if (pos->op == acc_cond::acc_op::Or)
--pos;
while (pos > start)
@ -477,12 +478,16 @@ namespace spot
case acc_cond::acc_op::Or:
return false;
case acc_cond::acc_op::And:
and_scope = std::min(and_scope, pos - pos->size);
--pos;
break;
case acc_cond::acc_op::Inf:
case acc_cond::acc_op::InfNeg:
case acc_cond::acc_op::Fin:
case acc_cond::acc_op::FinNeg:
if (pos[-1].mark.count() > 1 && pos > and_scope)
return false;
/* fall through */
case acc_cond::acc_op::Inf:
case acc_cond::acc_op::InfNeg:
pos -= 2;
break;
}