public Instruction ParseSingle(ParseState ParseState)
{
var InstructionPosition = Stream.Position;
var OpcodeNum = BinaryReader.ReadUInt16();
if (!Opcodes.ContainsKey(OpcodeNum))
{
throw(new NotImplementedException(String.Format("Unhandled opcode 0x{0:X2}", OpcodeNum)));
}
var Opcode = Opcodes[OpcodeNum];
var Params = new List <object>();
foreach (var FormatChar in Opcode.Format)
{
switch (FormatChar)
{
case '<': break;
case 's': Params.Add(ReadString()); break;
case 'S': Params.Add(ReadStringz()); break;
case '1': Params.Add(BinaryReader.ReadByte()); break;
case '7': Params.Add((AritmeticOps)BinaryReader.ReadByte()); break;
case '9': Params.Add((ComparisionOps)BinaryReader.ReadByte()); break;
case '2': Params.Add(BinaryReader.ReadInt16()); break;
case 'v': Params.Add(new VariableReference()
{
Index = BinaryReader.ReadUInt16()
}); break;
case '4': Params.Add(BinaryReader.ReadUInt32()); break;
case 'L': Params.Add(new LabelReference()
{
Offset = BinaryReader.ReadUInt32()
}); break;
case 'P':
{
var ParamType = BinaryReader.ReadByte();
object Value = null;
switch (ParamType)
{
case 0x00: Value = BinaryReader.ReadSByte(); break;
case 0x10: Value = BinaryReader.ReadByte(); break;
case 0x20: Value = BinaryReader.ReadInt16(); break;
case 0x40: Value = BinaryReader.ReadInt32(); break;
case 0x01: Value = new VariableReference()
{
Index = BinaryReader.ReadUInt16()
}; break;
case 0x02: Value = new SpecialReference()
{
Index = BinaryReader.ReadUInt16()
}; break;
default: throw (new NotImplementedException(String.Format("Invalid param type {0}", ParamType)));
}
Params.Add(Value);
}
break;
default:
throw(new NotImplementedException(String.Format("Invalid format '{0}'", FormatChar)));
}
}
try
{
if (ParseState.Unindent.Contains((uint)InstructionPosition))
{
ParseState.Indent--;
}
switch (Opcode.OpcodeName)
{
case "JUMP_ALWAYS":
ParseState.Indent--;
break;
}
return(new Instruction()
{
Position = (uint)InstructionPosition,
Opcode = Opcode,
Parameters = Params.ToArray(),
Indent = ParseState.Indent,
});
}
finally
{
switch (Opcode.OpcodeName)
{
//case "FUNCTION_DEF":
case "JUMP_IF":
ParseState.Unindent.Add(((LabelReference)(Params.ToArray()[3])).Offset);
ParseState.Indent++;
break;
case "JUMP_ALWAYS":
ParseState.Unindent.Add(((LabelReference)(Params.ToArray()[0])).Offset);
ParseState.Indent += 2;
break;
}
}
}
