private OperationResult ParseConstant()
{
string value = null;
var sb = new StringBuilder();
string untrimmedFinal = null;
var wasPoint = false;
while (Const.Digits.Contains(Input[Pointer]) || Input[Pointer] == Const.Point)
{
if (Input[Pointer] == Const.Point)
{
if (!wasPoint)
{
wasPoint = true;
}
else
{
return(OperationResult.CreateFailure("A number cannot have multiple points."));
}
}
sb.Append(Input[Pointer]);
if (Pointer + 1 >= Input.Length || (Input[Pointer + 1] != Const.Point && !Const.Digits.Contains(Input[Pointer + 1])))
{
break;
}
else
{
Pointer++;
}
}
LastCharacter = Input[Pointer];
untrimmedFinal = sb.ToString();
value = untrimmedFinal == "0" ? untrimmedFinal : untrimmedFinal.TrimStart('0');
var parsedDecimal = decimal.Parse(value);
var token = new ConstantToken(parsedDecimal);
if (NegateFlag && _parenthesesStack.Count == 0)
{
token.Negate();
NegateFlag = false;
}
_expressionStack.Push(token);
return(ParseAndSimplify());
}
