public void regexToNDFA(ref int depth, ref Automata <String> automata, string prevstate = null, string nextstate = null)
{
//THOMPSON
if (depth == 0)
{
prevstate = "1";
automata.defineAsStartState(prevstate);
depth += 2;
}
//depth += 1;
bool nonext = false;
switch (operate)
{
case Operator.OR:
automata.addTransition(new Transition <string>(prevstate, depth.ToString()));
String splitstate = depth.ToString();
depth++;
String lnewstate = splitstate;
if (left.operate == Operator.ONE)
{
foreach (char s in left.terminal)
{
automata.addTransition(new Transition <string>(lnewstate, s, depth.ToString()));
automata.addToAlphabet(s);
lnewstate = depth.ToString(); //NOT PROPERLY IMPLEMENTED BEHAVIOR
depth++;
}
}
else
{
automata.addTransition(new Transition <string>(lnewstate, depth.ToString())); //print = print + left.terminal;//left.regexToNDFA(depth, automata);
lnewstate = depth.ToString();
depth++;
String loldstate2 = depth.ToString();
depth++;
left.regexToNDFA(ref depth, ref automata, lnewstate, loldstate2);
lnewstate = loldstate2;
//depth++;
}
automata.addTransition(new Transition <string>(prevstate, depth.ToString()));
splitstate = depth.ToString();
depth++;
depth++;
String rnewstate = splitstate;
if (right.operate == Operator.ONE)
{
foreach (char s in right.terminal)
{
automata.addTransition(new Transition <string>(rnewstate, s, depth.ToString()));
automata.addToAlphabet(s);
rnewstate = depth.ToString();
depth++;
}
}
else
{
automata.addTransition(new Transition <string>(rnewstate, depth.ToString())); //print = print + left.terminal;//left.regexToNDFA(depth, automata);
rnewstate = depth.ToString(); //NOT PROPERLY IMPLEMENTED BEHAVIOR
depth++;
String roldstate = depth.ToString();
depth++;
right.regexToNDFA(ref depth, ref automata, rnewstate, roldstate);
rnewstate = roldstate;
//depth++;
}
if (nextstate == null)
{
automata.addTransition(new Transition <string>(lnewstate, depth.ToString()));
automata.addTransition(new Transition <string>(rnewstate, depth.ToString()));
automata.defineAsFinalState(depth.ToString());
depth++;
}
else
{
automata.addTransition(new Transition <string>(lnewstate, nextstate)); //WRONG
automata.addTransition(new Transition <string>(rnewstate, nextstate));
}
break;
case Operator.DOT:
if (nextstate == null)
{
nextstate = depth.ToString();
depth++;
nonext = true;
}
depth++;
String tmpstate = depth.ToString();
if (left.operate == Operator.ONE)
{
lnewstate = prevstate;
depth++;
foreach (char s in left.terminal)
{
automata.addTransition(new Transition <string>(lnewstate, s, depth.ToString()));
automata.addToAlphabet(s);
lnewstate = depth.ToString();
depth++;
}
automata.addTransition(new Transition <string>(lnewstate, tmpstate));
}
else
{
left.regexToNDFA(ref depth, ref automata, prevstate, tmpstate);
}
if (right.operate == Operator.ONE)
{
lnewstate = tmpstate;
depth++;
foreach (char s in right.terminal)
{
automata.addTransition(new Transition <string>(lnewstate, s, depth.ToString()));
automata.addToAlphabet(s);
lnewstate = depth.ToString();
depth++;
}
automata.addTransition(new Transition <string>(lnewstate, nextstate));
}
else
{
right.regexToNDFA(ref depth, ref automata, tmpstate, nextstate);
}
if (nonext)
{
automata.defineAsFinalState(nextstate);
}
break;
case Operator.ONE: //NOT REALLY IMPLEMENTED
depth++;
lnewstate = prevstate;
foreach (char s in terminal)
{
automata.addTransition(new Transition <string>(lnewstate, s, depth.ToString()));
automata.addToAlphabet(s);
lnewstate = depth.ToString();
depth++;
}
if (nextstate == null)
{
automata.defineAsFinalState((depth - 1).ToString());
}
break;
case Operator.PLUS:
if (nextstate == null)
{
nextstate = depth.ToString();
depth++;
nonext = true;
}
depth++;
automata.addTransition(new Transition <string>(prevstate, depth.ToString()));
lnewstate = depth.ToString();
String loldstate = depth.ToString();
depth++;
if (left.operate == Operator.ONE)
{
foreach (char s in left.terminal)
{
automata.addTransition(new Transition <string>(lnewstate, s, depth.ToString()));
automata.addToAlphabet(s);
lnewstate = depth.ToString();
depth++;
}
automata.addTransition(new Transition <string>(lnewstate, loldstate));
automata.addTransition(new Transition <string>(lnewstate, depth.ToString()));
rnewstate = depth.ToString();
}
else
{
rnewstate = depth.ToString();
depth++;
left.regexToNDFA(ref depth, ref automata, lnewstate, rnewstate); //NOT CHECKED, PROBABLY WRONG
//automata.addTransition(new Transition<string>(loldstate, depth.ToString()));
automata.addTransition(new Transition <string>(rnewstate, lnewstate));
automata.addTransition(new Transition <string>(rnewstate, depth.ToString()));
rnewstate = depth.ToString();
}
if (!nonext)
{
automata.addTransition(new Transition <string>(depth.ToString(), nextstate));
}
else
{
depth++;
automata.addTransition(new Transition <string>(rnewstate, depth.ToString()));
automata.defineAsFinalState(depth.ToString());
}
depth++;
break;
case Operator.STAR:
if (depth.ToString() == nextstate)
{
depth++;
}
if (nextstate == null)
{
nextstate = depth.ToString();
depth++;
nonext = true;
}
automata.addTransition(new Transition <string>(prevstate, depth.ToString()));
lnewstate = depth.ToString();
rnewstate = lnewstate;
depth++;
if (left.operate == Operator.ONE)
{
foreach (char s in left.terminal)
{
automata.addTransition(new Transition <string>(lnewstate, s, depth.ToString()));
automata.addToAlphabet(s);
lnewstate = depth.ToString(); //NOT PROPERLY IMPLEMENTED BEHAVIOR
depth++;
}
automata.addTransition(new Transition <string>(prevstate, nextstate));
automata.addTransition(new Transition <string>(lnewstate, rnewstate));
}
else
{
automata.addTransition(new Transition <string>(lnewstate, depth.ToString())); //print = print + left.terminal;//left.regexToNDFA(depth, automata);
loldstate = lnewstate;
lnewstate = depth.ToString();
depth++;
String futurestate = depth.ToString();
depth++;
left.regexToNDFA(ref depth, ref automata, lnewstate, futurestate);
depth++;
automata.addTransition(new Transition <string>(futurestate, depth.ToString()));
automata.addTransition(new Transition <string>(futurestate, lnewstate));
automata.addTransition(new Transition <string>(loldstate, depth.ToString()));
lnewstate = depth.ToString();
depth++;
}
if (!nonext)
{
automata.addTransition(new Transition <string>(lnewstate, nextstate));
}
else
{
automata.addTransition(new Transition <string>(lnewstate, depth.ToString()));
automata.defineAsFinalState(depth.ToString());
}
break;
}
}