void initTuringMachine(string s)
{
renderTimer.Enabled = false;
tm = new TuringMachine();
if (s != "")
{
programReader inReader2 = new programReader();
inReader2.ReadFromFile(ref tm, s);
}
else
{
programReader inReader = new programReader();
OpenFileDialog fileDialog = new OpenFileDialog();
fileDialog.Filter = "TM program |*.txt";
fileDialog.Title = "Select a Turing Machine program";
fileDialog.InitialDirectory = "";
fileDialog.RestoreDirectory = true;
if (fileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
string path = fileDialog.FileName;
if (inReader.ReadFromFile(ref tm, path) == programReader.INPUT_CODE.SUCCESSFUL)
{
StringBuilder sb = new StringBuilder();
for (int i = path.Length - 1; i >= 0; i--)
{
if (path[i] != '\\')
{
sb.Insert(0, path[i]);
}
else
{
break;
}
}
sb.Replace(".txt", "");
//this.Text = "Turing Machine" + "(" + sb.ToString() + ")";
}
}
}
this.Show();
if (tm.hasInitState)
{
initTapeGui();
renderTimer.Enabled = true;
}
}
public INPUT_CODE ReadFromFile(ref TuringMachine tm, String path) // Return true if input is correct
{
const char comma = ',';
const String initString = "init: ";
const String acceptString = "accept: ";
const char moveLeft = '<';
const char moveRight = '>';
const char hold = '-';
int stateCount = 0;
int tapeCount = 0;
try
{
using (StreamReader sr = new StreamReader(path))
{
StringBuilder sb = new StringBuilder();
List <string> states = new List <string>();
String line;
while (!sr.EndOfStream)
{
line = sr.ReadLine();
while (line.Length == 0 || line[0] == '/')
{
line = sr.ReadLine();
}
if (!tm.hasInitState && line.Substring(0, initString.Length) == initString)
{
sb.Append(line, initString.Length, line.Length - initString.Length);
tm.CurrentState = sb.ToString();
tm.initState = sb.ToString();
sb = new StringBuilder();
continue;
}
if (line.Length >= acceptString.Length && line.Substring(0, acceptString.Length) == acceptString)
{
for (int i = acceptString.Length; i < line.Length; i++)
{
if (line[i] != comma)
{
sb.Append(line[i]);
}
else
{
tm.Add_AcceptState(sb.ToString());
sb = new StringBuilder();
}
}
if (sb.Length > 0)
{
tm.Add_AcceptState(sb.ToString());
sb = new StringBuilder();
}
continue;
}
if (line.Length > 1)
{
String currentState = "";
List <char> currentChars = new List <char>();
String newState = "";
List <char> newChars = new List <char>();
List <Action> actions = new List <Action>();
int i;
for (i = 0; i < line.Length; i++) // Find transition current state
{
if (line[i] != comma)
{
sb.Append(line[i]);
}
else
{
currentState = sb.ToString();
sb = new StringBuilder();
break;
}
}
for (; i < line.Length; i++)
{
if (line[i] == comma)
{
continue;
}
currentChars.Add(line[i]);
}
line = sr.ReadLine();
for (i = 0; i < line.Length; i++)
{
if (line[i] != comma)
{
sb.Append(line[i]);
}
else
{
newState = sb.ToString();
sb = new StringBuilder();
break;
}
}
for (; i < line.Length; i++)
{
if (line[i] == comma)
{
continue;
}
if (line[i] == moveLeft)
{
actions.Add(Action.MOVE_LEFT);
continue;
}
if (line[i] == moveRight)
{
actions.Add(Action.MOVE_RIGHT);
continue;
}
if (line[i] == hold)
{
actions.Add(Action.HOLD);
continue;
}
newChars.Add(line[i]);
}
if (currentState.Length == 0)
{
return(INPUT_CODE.BAD_TRANSITION);
}
if (currentChars.Count == 0)
{
return(INPUT_CODE.BAD_TRANSITION);
}
if (newState.Length == 0)
{
return(INPUT_CODE.BAD_TRANSITION);
}
if (newChars.Count == 0)
{
return(INPUT_CODE.BAD_TRANSITION);
}
if (actions.Count == 0)
{
return(INPUT_CODE.BAD_TRANSITION);
}
if (currentChars.Count != newChars.Count &&
currentChars.Count != actions.Count)
{
return(INPUT_CODE.BAD_TRANSITION);
}
if (tapeCount == 0)
{
tapeCount = currentChars.Count;
}
else
{
if (tapeCount != currentChars.Count)
{
return(INPUT_CODE.TAPE_COUNTS_NOT_MATCH);
}
}
Transition newTransition;
newTransition.currentState = currentState;
newTransition.currentChars = currentChars;
newTransition.newState = newState;
newTransition.newChars = newChars;
newTransition.actions = actions;
tm.AddTransition(newTransition);
}
}
}
}
catch (Exception e)
{
return(INPUT_CODE.FILE_NOT_FOUND);
}
if (!tm.hasInitState)
{
return(INPUT_CODE.NO_INIT_STATES);
}
if (tm.acceptStates.Count == 0)
{
return(INPUT_CODE.NO_ACCEPT_STATES);
}
for (int i = 0; i < tapeCount; i++)
{
tm.tapes.Add(new Tape());
}
return(INPUT_CODE.SUCCESSFUL);
}