public void GetSymbolReturnsBlankCharForUninitialisedTapeEntries()
{
Tape tape = new Tape();
Assert.AreEqual(' ', tape.GetSymbol(-1));
Assert.AreEqual(' ', tape.GetSymbol(1));
}
public void GetSymbolReturnsCharStoredInTapeElements()
{
Tape tape = new Tape();
tape.Write('a');
Assert.AreEqual('a', tape.GetSymbol(0));
}
public void MovingTapeRightBringsBlankCellIntoView()
{
Tape tape = new Tape();
tape.Write('a');
tape.MoveRight();
Assert.AreEqual(' ', tape.Read());
}
public void GetIndexReturnsCurrentTapeIndex()
{
Tape tape = new Tape();
tape.MoveRight();
Assert.AreEqual(1, tape.GetIndex());
tape.MoveLeft();
Assert.AreEqual(0, tape.GetIndex());
}
public void MovingTapeLeftThenRightReturnsTapeToOriginalPosition()
{
Tape tape = new Tape();
char symbol = 'a';
tape.Write(symbol);
tape.MoveLeft();
tape.MoveRight();
Assert.AreEqual(symbol, tape.Read());
}
static void Main(string[] args)
{
Console.OutputEncoding = Encoding.Default;
ITape tape = null;
try
{
tape = new Tape(File.ReadAllText("./init.tap"));
}
catch(Exception)
{
tape = new Tape();
}
IInstructionTable instructionTable = null;
try
{
instructionTable = ParseInstructions(args);
}
catch(Exception ex)
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Failed to load instruction table. " + ex.Message);
Console.ReadLine();
return;
}
Processor processor = new Processor(tape, instructionTable);
Console.CursorVisible = false;
int clockDelay = 500;
try
{
clockDelay = Int32.Parse(ConfigurationManager.AppSettings.Get("ClockDelay"));
}
catch(Exception)
{
}
while(true)
{
Console.SetCursorPosition(0, 0);
DrawTape(tape);
DrawHead(processor);
Console.WriteLine();
Console.WriteLine("Tick: " + processor.Tick);
if(!processor.Execute())
{
break;
}
Thread.Sleep(clockDelay);
}
Console.WriteLine("Execution completed!");
Console.ReadLine();
}
public void GetSymbolReturnsBlankCharForNullElements()
{
Tape tape = new Tape();
Assert.AreEqual(' ', tape.GetSymbol(0));
}
public void TapeStoresAllWrittenSymbolsAsItMovesRight()
{
Tape tape = new Tape();
List<char> symbols = new List<char>() { 'a', 'b', 'c', 'd' };
for(int symbolIndex = 0; symbolIndex < symbols.Count; ++symbolIndex)
{
tape.Write(symbols[symbolIndex]);
tape.MoveRight();
}
for (int symbolIndex = symbols.Count - 1; symbolIndex >= 0; --symbolIndex)
{
tape.MoveLeft();
Assert.AreEqual(symbols[symbolIndex], tape.Read());
}
}
public void TapeCanBeInitialisedWithHeadBeforeInitialisedCellsAndWrittenTo()
{
Tape tape = new Tape("a,b\n-1");
tape.Write('c');
Assert.AreEqual('c', tape.Read());
}
public void TapeCanBeInitialisedWithHeadAfterInitialisedCellsAndRead()
{
Tape tape = new Tape("a,b\n2");
Assert.AreEqual(' ', tape.Read());
tape.Write('c');
Assert.AreEqual('c', tape.Read());
}
public void TapeCanBeInitialisedWithDifferentValues()
{
Tape tape = new Tape("a,,b,,c");
Assert.AreEqual('a', tape.Read());
tape.MoveRight();
Assert.AreEqual(' ', tape.Read());
tape.MoveRight();
Assert.AreEqual('b', tape.Read());
tape.MoveRight();
Assert.AreEqual(' ', tape.Read());
tape.MoveRight();
Assert.AreEqual('c', tape.Read());
tape.MoveRight();
}
public void TapeCanBeInitialisedToDifferentStartPosition()
{
Tape tape = new Tape("a,,b,,c\n2");
Assert.AreEqual('b', tape.Read());
tape.MoveRight();
Assert.AreEqual(' ', tape.Read());
tape.MoveRight();
Assert.AreEqual('c', tape.Read());
tape.MoveRight();
}
public void ReadReturnsLastWrittenCharacter()
{
Tape tape = new Tape();
char symbol = 'a';
tape.Write(symbol);
Assert.AreEqual(symbol, tape.Read());
}
public void ReadingNewTapeReturnsNull()
{
Tape tape = new Tape();
Assert.AreEqual(' ', tape.Read());
}
