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#include "CertainZeroFPA.h"
namespace ctl{
bool CertainZeroFPA::search(DependencyGraph &t_graph, AbstractSearchStrategy &W)
{
PriorityQueue N;
Configuration &v = t_graph.initialConfiguration();
v.assignment = ZERO;
for(Edge *e : t_graph.successors(v)){
W.push(e);
if(e->source->IsNegated)
N.push(e);
}
while(!W.empty() || !N.empty()){
Edge *e;
if(!W.empty()) {
e = W.pop();
}
else if (!N.empty()) {
e = N.top();
N.pop();
}
// e->edgePrinter();
/*****************************************************************/
/*Data handling*/
int targetONEassignments = 0;
int targetZEROassignments = 0;
Configuration * lastUnknown = NULL;
bool czero = false;
for(auto c : e->targets){
if (c->assignment == ONE) {
targetONEassignments++;
}
else if (c->assignment == ZERO) {
targetZEROassignments++;
}
else if (c->assignment == CZERO){
czero = true;
break;
}
else if(c-> assignment == UNKNOWN){
lastUnknown = c;
}
}
/*****************************************************************/
if(e->isDeleted || e->source->assignment == ONE || e->source->assignment == CZERO){
//std::cout << "== Ignored ==\n" << std::flush;
}
/*****************************************************************/
else if(e->targets.size() == targetONEassignments){
if(e->source->IsNegated){
e->source->assignment = CZERO;
e->source->removeSuccessor(e);
}
else{
e->source->assignment = ONE;
}
if(e->source == &v) break;
for(Edge *de : e->source->DependencySet){
W.push_dependency(de);
}
e->source->DependencySet.clear();
}
else if(czero){
if(e->source->IsNegated){
e->source->assignment = ONE;
if(e->source == &v) break;
for(Edge *de : e->source->DependencySet){
W.push_dependency(de);
}
e->source->DependencySet.clear();
}
else{
if(e->source->Successors.size() <= 1){
e->source->assignment = CZERO;
if(e->source == &v) break;
for(Edge *de : e->source->DependencySet){
W.push_dependency(de);
}
e->source->DependencySet.clear();
}
}
e->source->removeSuccessor(e);
}
else if(targetZEROassignments > 0){
if(e->source->IsNegated && e->processed){
e->source->assignment = ONE;
if(e->source == &v) break;
for(Edge *de : e->source->DependencySet){
W.push_dependency(de);
}
e->source->DependencySet.clear();
}
else {
for(auto c : e->targets){
if(c->assignment == ZERO) {
c->DependencySet.push_back(e);
}
}
}
}
else if(lastUnknown != NULL){
Configuration *tc = lastUnknown;
tc->assignment = ZERO;
tc->DependencySet.push_back(e);
t_graph.successors(*tc);
if(tc->Successors.empty()){
tc->assignment = CZERO;
W.push_dependency(e);
}
else {
for(Edge *succ : tc->Successors){
W.push(succ);
if(succ->source->IsNegated){
N.push(succ);
}
}
}
}
e->processed = true;
}
// std::cout << "Final Assignment: " << v.assignment << " " << ((v.assignment == ONE) ? true : false) << std::endl;
return (v.assignment == ONE) ? true : false;
}
}
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