public void ExecuteNext(CancellationToken ct)
{
if (ProgramIterator >= _programCode.Length - 1 || ct.IsCancellationRequested)
{
EndOfExecutionEvent?.Invoke(this, EventArgs.Empty);
return;
}
switch (_programCode[ProgramIterator])
{
case var word when new Regex(@"Put this ([^ ]*?) pancake on top!").IsMatch(word):
{
var match = Regex.Match(word, @"Put this ([^ ]*?) pancake on top!");
PancakeStack.Push(match.Groups[1].Value.Length);
break;
}
case "Eat the pancake on top!":
if (CheckPancakeStackCount(1))
{
PancakeStack.Pop();
}
break;
case "Put the top pancakes together!":
{
if (CheckPancakeStackCount(2))
{
var firstTopItem = PancakeStack.Pop();
var secondTopItem = PancakeStack.Pop();
PancakeStack.Push(firstTopItem + secondTopItem);
}
break;
}
case "Give me a pancake!":
Input = "";
while (string.IsNullOrEmpty(Input))
{
if (ct.IsCancellationRequested)
{
break;
}
WaitingForInputEvent?.Invoke(this, new WaitingForInputEventArgs()
{
Type = InputType.Numeric
});
WaitHandle.WaitOne();
}
if (!ct.IsCancellationRequested)
{
if (CheckIfValueIsInt32(Input))
{
PancakeStack.Push(Convert.ToInt32(Input));
Input = "";
}
}
break;
case "How about a hotcake?":
while (string.IsNullOrEmpty(Input))
{
if (ct.IsCancellationRequested)
{
break;
}
WaitingForInputEvent?.Invoke(this, new WaitingForInputEventArgs()
{
Type = InputType.Alphanumeric
});
WaitHandle.WaitOne();
}
if (!ct.IsCancellationRequested)
{
PancakeStack.Push(Input[0]);
Input = Input.Remove(0, 1); // imitate console buffer
}
break;
case "Show me a pancake!":
if (CheckPancakeStackCount(1))
{
NewOutputEvent?.Invoke(this, new OutputEventArgs()
{
Type = OutputType.Character, CharacterOutput = (char)PancakeStack.Peek()
});
}
break;
case "Take from the top pancakes!":
{
if (CheckPancakeStackCount(2))
{
var firstTopItem = PancakeStack.Pop();
var secondTopItem = PancakeStack.Pop();
PancakeStack.Push(firstTopItem - secondTopItem);
}
break;
}
case "Flip the pancakes on top!":
{
if (CheckPancakeStackCount(2))
{
var firstTopItem = PancakeStack.Pop();
var secondTopItem = PancakeStack.Pop();
PancakeStack.Push(firstTopItem);
PancakeStack.Push(secondTopItem);
}
break;
}
case "Put another pancake on top!":
{
if (CheckPancakeStackCount(1))
{
var topItem = PancakeStack.Pop();
PancakeStack.Push(topItem);
PancakeStack.Push(topItem);
}
break;
}
case var label when new Regex(@"\[(.*)\]").IsMatch(label):
{
if (CheckPancakeStackCount(1))
{
var match = Regex.Match(label, @"\[(.*)\]");
if (Labels.Any(item => item.Key == match.Groups[1].Value))
{
break;
}
Labels[match.Groups[1].Value] = PancakeStack.Peek() - 2; //Pancake stack language start counting lines from 1
LabelDictionaryChangedEvent?.Invoke(this, Labels);
}
break;
}
case var label when new Regex(@"If the pancake isn't tasty, go over to ""(.*)"".").IsMatch(label):
{
var match = Regex.Match(label, @"If the pancake isn't tasty, go over to ""(.*)"".");
if (CheckPancakeStackCount(1) && CheckIfLabelExist(match.Groups[1].Value))
{
if (PancakeStack.Peek() == 0)
{
ProgramIterator = Labels[match.Groups[1].Value];
}
}
break;
}
case var label when new Regex(@"If the pancake is tasty, go over to ""(.*)"".").IsMatch(label):
{
var match = Regex.Match(label, @"If the pancake is tasty, go over to ""(.*)"".");
if (CheckPancakeStackCount(1) && CheckIfLabelExist(match.Groups[1].Value))
{
if (PancakeStack.Peek() != 0)
{
ProgramIterator = Labels[match.Groups[1].Value];
}
}
break;
}
case "Put syrup on the pancakes!":
PancakeStack = new Stack <int>(PancakeStack.Select(item => item + 1).Reverse());
break;
case "Put butter on the pancakes!":
{
if (CheckPancakeStackCount(1))
{
var topItem = PancakeStack.Pop();
PancakeStack.Push(topItem + 1);
}
break;
}
case "Take off the syrup!":
PancakeStack = new Stack <int>(PancakeStack.Select(item => item - 1).Reverse());
break;
case "Take off the butter!":
{
if (CheckPancakeStackCount(1))
{
var topItem = PancakeStack.Pop();
PancakeStack.Push(topItem - 1);
}
break;
}
case "Show me a numeric pancake!":
if (CheckPancakeStackCount(1))
{
NewOutputEvent?.Invoke(this, new OutputEventArgs()
{
Type = OutputType.Line, LineOutput = PancakeStack.Peek().ToString()
});
}
break;
case "Eat all of the pancakes!":
ProgramIterator = _programCode.Length;
return;
}
PancakeStackChangedEvent?.Invoke(this, PancakeStack);
ProgramIterator++;
}
/// <summary>
/// Called when we receive another matching line from logcat
/// </summary>
/// <param name="output">Last matching line from logcat</param>
protected override void NewOutput(string output)
{
NewOutputEvent?.Invoke(this, output);
}