public Automata <String> NDFAToDFA(Automata <String> Automaton)
{
SortedSet <char> alphabet = Automaton.getAlphabet();
Automata <String> dfa = new Automata <String>(alphabet);
Dictionary <Transition <String>, SortedSet <String> > transitionsDict = new Dictionary <Transition <String>, SortedSet <String> >();
dfa.defineAsStartState(prettyPrint(findStartState(Automaton))); //Set startstates for dfa
foreach (char letter in alphabet) //Check all states after the startstate with all the letters in the alphabet
{
if (findMultipleAccessible(Automaton, letter, findStartState(Automaton)).Count() == 0)
{
dfa.addTransition(new Transition <string>(prettyPrint(findStartState(Automaton)), letter, "Ø"));
}
else
{
SortedSet <String> toStates = findMultipleAccessible(Automaton, letter, findStartState(Automaton));
Transition <String> newTransition = new Transition <string>(prettyPrint(findStartState(Automaton)), letter, prettyPrint(toStates));
transitionsDict.Add(newTransition, toStates);
dfa.addTransition(newTransition);
}
}
int tempTransitionsNumber = 0;
Dictionary <Transition <String>, SortedSet <String> > tempTransitionsDict = new Dictionary <Transition <String>, SortedSet <String> >();
while (dfa.getTransistionsNumber() != tempTransitionsNumber)
{
tempTransitionsNumber = dfa.getTransistionsNumber();
foreach (KeyValuePair <Transition <String>, SortedSet <String> > pair in transitionsDict)
{
foreach (char letter in alphabet)
{
if (findMultipleAccessible(Automaton, letter, pair.Value).Count() == 0)
{
if (dfa.getTransitions().Contains(new Transition <string>(pair.Key.getToState(), letter, "Ø")) == false)
{
dfa.addTransition(new Transition <string>(pair.Key.getToState(), letter, "Ø"));
tempTransitionsDict.Add(new Transition <string>(pair.Key.getToState(), letter, "Ø"), findMultipleAccessible(Automaton, letter, pair.Value));
}
}
else
{
SortedSet <String> toStates = findMultipleAccessible(Automaton, letter, pair.Value);
Transition <String> newTransition = new Transition <string>(pair.Key.getToState(), letter, prettyPrint(toStates));
if (dfa.getTransitions().Contains(new Transition <string>(pair.Key.getToState(), letter, prettyPrint(toStates))) == false)
{
tempTransitionsDict.Add(newTransition, toStates);
dfa.addTransition(newTransition);
}
}
}
}
transitionsDict = transitionsDict.Union(tempTransitionsDict).ToDictionary(k => k.Key, v => v.Value);
}
SortedSet <String> tempListFinal = new SortedSet <String>();
foreach (String stat in dfa.getStates())
{
foreach (String endState in Automaton.getFinalStates())
{
if (stat.Contains(endState))
{
tempListFinal.Add(stat);
}
}
}
foreach (String finState in tempListFinal)
{
dfa.defineAsFinalState(finState);
}
return(dfa);
}
