private static void ExecuteNumericAssignment()
{
// todo must check numeric assignment flavors
// todo must handle numeric buffers as targets and values
long?targetPos = null;
long?targetSize = null;
bool?isTargetByte = null;
targetPos = MemPos.GetPosByte(_tokens[_tokenNum]);
if (targetPos.HasValue)
{
targetSize = 1;
isTargetByte = true;
}
else
{
targetPos = MemPos.GetPosNumeric(_tokens[_tokenNum]);
if (targetPos.HasValue)
{
targetSize = MemPos.GetSizeNumeric(_tokens[_tokenNum]);
isTargetByte = false;
}
}
if (!targetPos.HasValue || !targetSize.HasValue || !isTargetByte.HasValue)
{
throw new SystemException("Cannot parse numeric assignment: Target not found");
}
_tokenNum++;
if (_tokens[_tokenNum] == "[")
{
_tokenNum++; // "["
long offset = GetNumericExpression();
if (_tokens[_tokenNum++] != "]")
{
throw new SystemException("GetNumericAssignment: No closing \"]\"");
}
targetPos += offset;
}
if (_tokens[_tokenNum] == "(")
{
throw new SystemException("TODO: Cannot handle buffer lengths yet");
}
if (_tokens[_tokenNum] != "=")
{
throw new SystemException("Cannot parse numeric expression: Equals sign expected");
}
_tokenNum++;
long result = GetNumericExpression();
if (isTargetByte.Value)
{
Mem.SetByte(targetPos.Value, result);
}
else
{
Mem.SetNum(targetPos.Value, targetSize.Value, result);
}
}
private static long GetNumericValue()
{
string currToken = _tokens[_tokenNum++];
if (Functions.IsNumber(currToken))
{
return(long.Parse(currToken));
}
if (currToken == "FALSE")
{
return(0);
}
if (currToken == "TRUE")
{
return(1);
}
long?targetPos = null;
long?targetSize = null;
bool?isTargetByte = null;
bool?isBuffer = null;
targetPos = MemPos.GetPosByte(currToken);
if (targetPos.HasValue)
{
targetSize = 1;
isTargetByte = true;
isBuffer = false;
}
else
{
targetPos = MemPos.GetPosNumeric(currToken);
if (targetPos.HasValue)
{
targetSize = MemPos.GetSizeNumeric(currToken);
isTargetByte = false;
isBuffer = false;
}
else
{
targetPos = MemPos.GetPosBufferPtr(currToken);
if (targetPos.HasValue)
{
if (_tokens[_tokenNum] == "(")
{
_tokenNum++;
targetSize = GetNumericValue();
_tokenNum++;
isTargetByte = false;
isBuffer = true;
}
}
}
}
if (!targetPos.HasValue || !targetSize.HasValue || !isTargetByte.HasValue || !isBuffer.HasValue)
{
throw new SystemException("GetNumericValue error");
}
if (_tokenNum < _tokenCount && _tokens[_tokenNum] == "[")
{
_tokenNum++; // "["
long offset = GetNumericExpression();
if (_tokens[_tokenNum++] != "]")
{
throw new SystemException("GetNumericValue: No closing \"]\"");
}
targetPos += offset;
}
if (isTargetByte.Value)
{
return(Mem.GetByte(targetPos.Value));
}
if (isBuffer.Value)
{
return(Mem.GetNumBuffer(targetPos.Value, targetSize.Value));
}
return(Mem.GetNum(targetPos.Value, targetSize.Value));
}