private static void Normal(byte b)
{
if ((b >= 33 && b <= 126))
{
VGAText.Write(b);
return;
}
switch (b)
{
case 0x08: VGAText.Backspace(); return; // ascii
case 0x0A: VGAText.Newline(); return; // ascii
case 0x0C: VGAText.Formfeed(); return; // ascii
case 0x0D: VGAText.CarriageReturn(); return; // ascii
case 0x1b: State = ControlState.Escape; return; // vt100
case 0x9E: State = ControlState.Color; return;
case 0x9F: State = ControlState.Background; return;
default: return;
}
}
public static void Write(byte b)
{
switch (State)
{
case ControlState.Normal: { Normal(b); return; }
case ControlState.Escape: { Escape(b); return; }
case ControlState.Color: { VGAText.SetColor(b); State = ControlState.Normal; return; }
case ControlState.Background: { VGAText.SetBackground(b); State = ControlState.Normal;; return; }
}
}
private static void Evaluate()
{
if (FirstCharacter == (byte)'E')
{
// Move to next line (ESC E)
VGAText.Newline();
}
else if (FirstCharacter == (byte)'[')
{
if (FinalCharacter == (byte)'m')
{
// Display Attributes
for (int i = 0; i < ParameterCount; i++)
{
var parameter = GetParameter(i + 1);
switch (parameter)
{
case 30: VGAText.SetColor(VGAColor.Black); break;
case 31: VGAText.SetColor(VGAColor.Red); break;
case 32: VGAText.SetColor(VGAColor.Green); break;
case 33: VGAText.SetColor(VGAColor.Yellow); break;
case 34: VGAText.SetColor(VGAColor.Blue); break;
case 35: VGAText.SetColor(VGAColor.Magenta); break;
case 36: VGAText.SetColor(VGAColor.Cyan); break;
case 37: VGAText.SetColor(VGAColor.White); break;
case 40: VGAText.SetBackground(VGAColor.Black); break;
case 41: VGAText.SetBackground(VGAColor.Red); break;
case 42: VGAText.SetBackground(VGAColor.Green); break;
case 43: VGAText.SetBackground(VGAColor.Yellow); break;
case 44: VGAText.SetBackground(VGAColor.Blue); break;
case 45: VGAText.SetBackground(VGAColor.Magenta); break;
case 46: VGAText.SetBackground(VGAColor.Cyan); break;
case 47: VGAText.SetBackground(VGAColor.White); break;
// FUTURE:
//0 Reset all attributes
//1 Bright
//2 Dim
//4 Underscore
//5 Blink
//7 Reverse
//8 Hidden
default: break;
}
}
}
else if (FinalCharacter == (byte)'J')
{
var parameter = GetParameter(1);
switch (parameter)
{
case 0: break; // TODO: Clear screen cursor dowon
case 1: break; // TODO: Clear screen cursor up
case 2: VGAText.Clear(); break;
default: break;
}
}
ClearControlSequences();
}
}