public OpcodeParamResult ParseLiteralParameter (OpcodeParamResult opcodeParamResult, string clearedParameter)
{
ushort literalValue;
if (clearedParameter.StartsWith("\'") && clearedParameter.EndsWith("\'") && clearedParameter.Length == 3)
{
literalValue = clearedParameter[1];
}
else if (clearedParameter.Contains("0x"))
{
literalValue = Convert.ToUInt16(clearedParameter, 16);
}
else if (clearedParameter.Trim().All(x => char.IsDigit(x)))
{
literalValue = Convert.ToUInt16(clearedParameter, 10);
}
else
{
opcodeParamResult.Param = (ushort)dcpuRegisterCodes.NextWord_Literal_Value;
opcodeParamResult.NextWord = true;
opcodeParamResult.LabelName = clearedParameter;
return opcodeParamResult;
}
ushort maxValue = 0x1F;
if (literalValue < maxValue)
{
opcodeParamResult.Param = 0x20;
opcodeParamResult.Param += literalValue;
}
else
{
opcodeParamResult.Param = (ushort)dcpuRegisterCodes.NextWord_Literal_Value;
opcodeParamResult.NextWord = true;
opcodeParamResult.NextWordValue = literalValue;
}
return opcodeParamResult;
}
public OpcodeParamResult ParseMemoryAddressPlusRegisterParameter (OpcodeParamResult opcodeParamResult, string clearedParameter)
{
var psplit = clearedParameter.Split('+');
if (psplit.Length < 2)
{
throw new Exception(string.Format("malformated memory reference '{0}'", clearedParameter));
}
var addressValue = "[+" + psplit[1] + "]";
if (!this.registerDictionary.ContainsKey(addressValue))
{
throw new Exception(string.Format("Invalid register reference in '{0}'", clearedParameter));
}
opcodeParamResult.Param = (ushort)this.registerDictionary[addressValue];
opcodeParamResult.NextWord = true;
if (psplit[0].StartsWith("\'") && psplit[0].EndsWith("\'") && psplit[0].Length == 3)
{
var val = (ushort)psplit[0][1];
opcodeParamResult.NextWordValue = val;
}
else if (psplit[0].Contains("0x"))
{
ushort val = Convert.ToUInt16(psplit[0].Trim(), 16);
opcodeParamResult.NextWordValue = val;
}
else if (psplit[0].Trim().All(x => char.IsDigit(x)))
{
var val = Convert.ToUInt16(psplit[0].Trim(), 10);
opcodeParamResult.NextWordValue = val;
}
else
{
opcodeParamResult.NextWord = true;
opcodeParamResult.LabelName = psplit[0].Trim();
}
return opcodeParamResult;
}
public OpcodeParamResult ParseMemoryAddressParameter (OpcodeParamResult opcodeParamResult, string clearedParameter)
{
opcodeParamResult.Param = (ushort)dcpuRegisterCodes.NextWord_Literal_Mem;
opcodeParamResult.NextWord = true;
if (clearedParameter.StartsWith("\'") && clearedParameter.EndsWith("\'") && clearedParameter.Length == 5)
{
ushort val = clearedParameter[1];
opcodeParamResult.NextWordValue = val;
}
else if (clearedParameter.Contains("0x"))
{
ushort val = Convert.ToUInt16(clearedParameter.Trim(), 16);
opcodeParamResult.NextWordValue = val;
}
else if (clearedParameter.Trim().All(x => char.IsDigit(x)))
{
ushort val = Convert.ToUInt16(clearedParameter.Trim(), 10);
opcodeParamResult.NextWordValue = val;
}
else
{
opcodeParamResult.NextWord = true;
opcodeParamResult.LabelName = clearedParameter.Trim();
}
return opcodeParamResult;
}
private OpcodeParamResult ParseParam(string param)
{
var opcodeParamResult = new OpcodeParamResult();
var clearedParameter = param.Replace(" ", string.Empty).Trim();
if (this.registerDictionary.ContainsKey(clearedParameter))
{
opcodeParamResult.Param = (ushort)this.registerDictionary[clearedParameter];
}
else
{
if ((clearedParameter.StartsWith("[") || clearedParameter.StartsWith("(")) && (clearedParameter.EndsWith("]") || clearedParameter.EndsWith(")")))
{
clearedParameter = clearedParameter.Substring(1, clearedParameter.Length - 2).Replace(" ", string.Empty);
if (clearedParameter.Contains("+"))
{
opcodeParamResult = ParseMemoryAddressPlusRegisterParameter(opcodeParamResult, clearedParameter);
}
else
{
opcodeParamResult = ParseMemoryAddressParameter(opcodeParamResult, clearedParameter);
}
}
else
{
ParseLiteralParameter (opcodeParamResult, clearedParameter);
}
}
return opcodeParamResult;
}