public static bool TryParse(string input, out Rational result)
{
result = new Rational();
if (input.LastIndexOf('-') > 0)
{
return(false);
}
string[] fullNumber = input.Split('.');
if (fullNumber.Length > 2)
{
return(false);
}
if (fullNumber.Length == 1 && !fullNumber[0].Contains(":"))
{
try
{
result.Numerator = int.Parse(fullNumber[0]);
}
catch (Exception)
{
return(false);
}
return(true);
}
if (fullNumber.Length == 1)
{
try
{
var fraction = fullNumber[0].Split(':');
result.Numerator = int.Parse(fraction[0]);
result.Denominator = int.Parse(fraction[1]);
return(true);
}
catch (Exception)
{
return(false);
}
}
try
{
var fraction = fullNumber[1].Split(':');
if (fraction.Length > 2)
{
return(false);
}
int sign = 1;
if (input.LastIndexOf('-') == 0)
{
sign = -1;
}
int z = int.Parse(fullNumber[0]);
int numerator = int.Parse(fraction[0]);
int denumerator = int.Parse(fraction[1]);
result.Denominator = denumerator;
result.Numerator = z * denumerator + sign * numerator;
return(true);
}
catch (Exception)
{
return(false);
}
}
