/**
* /// Undo of the extend operation
*/
public static void Undo(Fst fst)
{
State f = null;
int numStates = fst.GetNumStates();
for (int i = 0; i < numStates; i++)
{
State s = fst.GetState(i);
if (s.FinalWeight != fst.Semiring.Zero)
{
f = s;
break;
}
}
if (f == null)
{
Logger.LogInfo <ExtendFinal>("Final state not found.");
return;
}
for (int i = 0; i < numStates; i++)
{
State s = fst.GetState(i);
for (int j = 0; j < s.GetNumArcs(); j++)
{
Arc a = s.GetArc(j);
if (a.Ilabel == 0 && a.Olabel == 0 &&
a.NextState.GetId() == f.GetId())
{
s.FinalWeight = a.Weight;
}
}
}
fst.DeleteState(f);
}