bool ClingconDLPropagator::init(Clasp::Solver& s)
{
for (unsigned int i = 0; i != literals_.size(); ++i)
{
if (!s.isFalse(literals_[i]) || !s.isTrue(literals_[i]))
{
s.addWatch(literals_[i],this,Clasp::Literal(i+1,false).rep());
s.addWatch(~literals_[i],this,Clasp::Literal(i+1,true).rep());
}
}
for (unsigned int i = 0; i != literals_.size(); ++i)
{
std::vector<difflogic::DLPropagator::EdgeId> consequences;
if (s.isFalse(literals_[i]))
consequences = p_.deactivate(i+1);
else
if (s.isTrue(literals_[i]))
consequences = p_.activate(i+1);
for (const auto& j : consequences)
{
Clasp::Literal l = edgeid2lit(j);
if (!s_.isTrue(l))
{
if (!s.force(l))
return false;
//std::cout << "initially propagated " << l.var() << "," << l.sign() << " to pending: " << j << std::endl;
propagated_.push_back(l);
}
}
}
return true;
}
bool TheoryPropagator::PP::propagateFixpoint(Clasp::Solver& s, Clasp::PostPropagator*) {
typedef Potassco::AbstractPropagator::ChangeList ChangeList;
while (delta_ != trail_.size()) {
uint32 dl = s.decisionLevel();
if (undo_.back().level != dl) {
s.addUndoWatch(dl, this);
undo_.push_back(Undo(dl, delta_));
}
ChangeList change = Potassco::toSpan(&trail_[0] + delta_, trail_.size() - delta_);
delta_ = trail_.size();
status_ = ClauseCreator::status_open;
solver_ = &s;
inProp_ = true;
bool ok = wrapper_->prop_->propagate(*this, change);
inProp_ = false;
if (!ok && !s.hasConflict() && (status_ & ClauseCreator::status_asserting) != 0) {
if (s.level(clause_[1].var()) < dl && dl != s.backtrackLevel()) {
TheoryPropagator::PP::reset();
for (PostPropagator* n = this->next; n; n = n->next) { n->reset(); }
dl = s.undoUntil(s.level(clause_[1].var()));
}
if (!s.isFalse(clause_[0])) {
ok = ClauseCreator::create(*solver_, clause_, ccFlags_s | ClauseCreator::clause_no_prepare, Constraint_t::Other);
}
else {
return s.force(clause_[0], this);
}
}
if (s.hasConflict() || !ok || (s.queueSize() && !s.propagateUntil(this))) {
if (!s.hasConflict()) { s.setStopConflict(); }
return false;
}
CLASP_FAIL_IF(dl < s.decisionLevel(), "invalid operation in propagation");
}
return true;
}