private void Push(char input)
{
State s0 = new State();
State s1 = new State();
s0.AddTransition(input, s1);
FSATable nfaTable = new FSATable();
nfaTable.AppendState(s0);
nfaTable.AppendState(s1);
mOperandStack.Add(nfaTable);
mInputSet.Add(input);
}
private void ConvertNFAtoDFA()
{
mDFATable = new FSATable();
if (mNFATable.GetStates().Count == 0)
{
return;
}
State.mStateIDCounter = 0;
HashSet <State> dfaStartStates;
EpsilonClosure(out dfaStartStates, mNFATable.GetFirstState());
State dfaStartState = new State(dfaStartStates);
mDFATable.AppendState(dfaStartState);
List <State> unmarkedDFAStates = new List <State>();
unmarkedDFAStates.Add(dfaStartState);
while (unmarkedDFAStates.Count != 0)
{
State processingDFAState = unmarkedDFAStates[unmarkedDFAStates.Count - 1];
unmarkedDFAStates.RemoveAt(unmarkedDFAStates.Count - 1);
foreach (char c in mInputSet)
{
HashSet <State> moveResult, epsilonClosureResult;
Move(c, out moveResult, new HashSet <State>(processingDFAState.mNFAStates));
EpsilonClosure(out epsilonClosureResult, moveResult);
bool found = false;
State s = null;
for (int i = 0; i < mDFATable.GetStates().Count; ++i)
{
s = mDFATable.GetState(i);
if (s.mNFAStates.SetEquals(epsilonClosureResult))
{
found = true;
break;
}
}
if (found == false)
{
State u = new State(epsilonClosureResult);
unmarkedDFAStates.Add(u);
mDFATable.AppendState(u);
processingDFAState.AddTransition(c, u);
}
else
{
processingDFAState.AddTransition(c, s);
}
}
}
}