static void Main(string[] args)
{
Console.Write("Please enter a path to the source file: ");
string userInput = Console.ReadLine();
if (userInput.Length < 7)
{
Console.WriteLine("File name isnt big enough to possibly be a .TM file made from a .txt file");
Console.WriteLine("Press any key to exit program and try again.");
Console.ReadKey();
Environment.Exit(0);
}
if (userInput[userInput.Length - 7] != '.' && userInput[userInput.Length - 6] != 'T' && userInput[userInput.Length - 5] != 'M')
{
Console.WriteLine("File was not a .TM file");
Console.WriteLine("Press any key to exit program and try again.");
Console.ReadKey();
Environment.Exit(0);
}
TuringMachine testMachine;
try { testMachine = new TuringMachine(userInput); }
catch (FormatException x)
{
Console.WriteLine(x.Message);
Console.WriteLine("Press any key to exit program and try again.");
Console.ReadKey();
Environment.Exit(0);
}
catch (UnauthorizedAccessException)
{
Console.WriteLine("File could not be accessed due to permission level.");
Console.WriteLine("Press any key to exit program and try again.");
Console.ReadKey();
Environment.Exit(0);
}
catch (System.IO.FileNotFoundException)
{
Console.WriteLine("File does not exist");
Console.WriteLine("Press any key to exit program and try again.");
Console.ReadKey();
Environment.Exit(0);
}
testMachine = new TuringMachine(userInput);
try { testMachine.run(testMachine); }
catch (FormatException x)
{
Console.WriteLine(x.Message);
Console.WriteLine("Press any key to exit program and try again.");
Console.ReadKey();
Environment.Exit(0);
}
Console.ReadKey();
}
public void run(TuringMachine machine)
{
currentState = startState;
header = 1;
tape = setTape();
showTape();
bool foundEdge;
while (currentState != acceptState || currentState != rejectState)
{
foundEdge = false;
List <Edge> potentialEdges = new List <Edge>();
try { potentialEdges = transitionFunction[currentState]; }
catch
{
currentState = rejectState;
continue;
}
foreach (Edge x in potentialEdges)
{
if (potentialEdges.Count == 0)
{
currentState = rejectState;
}
if (x.read.ToString().Equals(tape[header]))
{
tape[header] = x.write.ToString();
if (x.moveHeader == 'R')
{
if (header < tape.Count() - 2)
{
header++;
tape[header - 2] = tape[header - 1];
tape[header - 1] = "[" + x.nextState.name + "]";
}
else
{
resizeArray(tape);
header++;
tape[header - 2] = tape[header - 1];
tape[header - 1] = "[" + x.nextState.name + "]";
}
}
else
{
if (header > 1)
{
header--;
tape[header] = tape[header - 1];
tape[header - 1] = "[" + x.nextState.name + "]";
//header--;
}
else
{
throw new FormatException("Header fell off the front of the tape. Only infinite in the other direction.");
}
}
currentState = x.nextState;
foundEdge = true;
break;
}
}
if (!foundEdge)
{
currentState = rejectState;
}
Console.Write("\n");
if (currentState == acceptState)
{
Console.Write("Accept: ");
}
else if (currentState == rejectState)
{
Console.Write("Reject: ");
}
showTape();
}
}
