public static Roman Parse(string str)
{
var roman = new Roman();
char[] chars = str.ToCharArray();
chars.ToList().ForEach(c => roman._primitives.Add(RomanPrimitive.Parse(c)));
return(roman);
}
public int Calculate()
{
if (_dirty)
{
_valueCache = 0;
int result = 0;
int length = _primitives.Count();
for (int i = 0; i < length; i++)
{
RomanPrimitive current = _primitives[i];
result += current.OctValue;
if (i == length - 1)
{
return(result);
}
RomanPrimitive next = _primitives[i + 1];
if (current.OctValue < next.OctValue)
{
result = next.OctValue - result;
i++;
}
else if (current.OctValue == next.OctValue)
{
if (!current.AllowRepeat)
{
throw new Exception(string.Format("{0} can't be repeated", current.Symbol));
}
int count = 2;
for (int j = i + 2; j < length; j++)
{
if (_primitives[j].Symbol != current.Symbol)
{
break;
}
count++;
result += current.OctValue;
i++;
if (count > 3)
{
throw new Exception(string.Format("{0} can't be repeated more than 3 times",
current.Symbol));
}
}
}
}
_valueCache = result;
}
return(_valueCache);
}