public override OperatorOutput GenerateBinary(AssemblerState assemblerState, AsmLine asmLine)
{
if (string.IsNullOrWhiteSpace(asmLine.Label))
{
assemblerState.RaiseError("IS must have a label.");
}
else
{
// TODO only integer constants and register substitutions are supported
// register
if (TryParseRegister(asmLine.Expr, out byte registerRef))
{
assemblerState.DefineVariable(asmLine.Label, new RegisterCompilerVariable(registerRef));
}
// constant
else if (int.TryParse(asmLine.Expr, out int constant))
{
assemblerState.DefineVariable(asmLine.Label, new ByteConstantAssemblerVariable((byte)constant));
}
else
{
assemblerState.RaiseError($"IS expression, '{asmLine.Expr}' must be a constant integer or register reference.");
}
}
return(new OperatorOutput());
}
public override OperatorOutput GenerateBinary(AssemblerState assemblerState, AsmLine asmLine)
{
List <byte> bytes = new List <byte>();
string[] args = new[] { asmLine.X, asmLine.Y, asmLine.Z };
foreach (var arg in args)
{
if (TryParseConstant(arg, out byte b))
{
bytes.Add(b);
}
else if (arg.StartsWith('"') && arg.EndsWith('"'))
{
bytes.AddRange(Encoding.ASCII.GetBytes(arg.Trim('"')));
}
else if (string.IsNullOrEmpty(arg))
{
// do nothing
}
else
{
throw new Exception($"Unable to generate byte string. Unknown argument format: '{arg}'.");
}
}
if (!string.IsNullOrEmpty(asmLine.Label))
{
assemblerState.DefineVariable(asmLine.Label, new OctaConstantAssemblerVariable(assemblerState.ProgramCounter));
}
return(new OperatorOutput()
{
Output = bytes.ToArray()
});
}