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safra: Output parity acceptance sets

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* src/twaalgos/safra.cc, src/twaalgos/safra.hh:  Note that the created
automaton is not a true parity automaton as they are not handled yet
by Spot.
This commit is contained in:
Alexandre Lewkowicz 2015-05-19 16:32:00 +02:00 • committed by Alexandre Duret-Lutz
parent f2fa92004c
commit ef3143f048
2 changed files with 15 additions and 5 deletions
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14
src/twaalgos/safra.cc
View file

@ -53,25 +53,29 @@ namespace spot
for (auto& s: res)
{
safra_state& tmp = s.first;
tmp.finalize_construction();
s.first.color_ = tmp.finalize_construction();
}
return res;
}
void safra_state::finalize_construction()
unsigned safra_state::finalize_construction()
{
unsigned red = -1U;
unsigned green = -1U;
std::vector<unsigned> rem_succ_of;
assert(is_green_.size() == nb_braces_.size());
for (unsigned i = 0; i < is_green_.size(); ++i)
{
if (nb_braces_[i] == 0)
{
red = std::min(red, 2 * i + 1);
// TODO We also emit Red = min(red, i)
// Step A3: Brackets that do not contain any nodes emit red
is_green_[i] = false;
}
else if (is_green_[i])
{
green = std::min(green, 2 * i);
// Step A4 Emit green
rem_succ_of.emplace_back(i);
}
@ -109,6 +113,7 @@ namespace spot
// it
nn.disable_construction();
}
return std::min(red, green);
}
void safra_state::node::renumber(const std::vector<unsigned>& decr_by)
@ -317,10 +322,13 @@ namespace spot
else
{
dst_num = res->new_state();
s.first.print_debug(dst_num);
// s.first.print_debug(dst_num);
todo.push_back(s.first);
seen.insert(std::make_pair(s.first, dst_num));
}
if (s.first.color_ != -1U)
res->new_transition(src_num, dst_num, s.second, {s.first.color_});
else
res->new_transition(src_num, dst_num, s.second);
}
}

4
src/twaalgos/safra.hh
View file

@ -70,7 +70,8 @@ namespace spot
// A new intermediate node is created with src's braces and with dst as id
// A merge is done if dst already existed in *this
void update_succ(const node& src, unsigned dst, const acc_cond::mark_t acc);
void finalize_construction();
// Return the emitted color, red or green
unsigned finalize_construction();
// A list of nodes similar to the ones of a
// safra tree. These are constructed in the same way as the powerset
// algorithm.
@ -80,6 +81,7 @@ namespace spot
std::vector<size_t> nb_braces_;
// A bitfield to know if a brace can emit green.
std::vector<bool> is_green_;
unsigned color_;
};
SPOT_API twa_graph_ptr