private static T Parse <T>(IValueHelper <T> valueHelper, string s, out T n, out T d)
where T : struct, IComparable, IFormattable, IConvertible, IComparable <T>, IEquatable <T>
{
if (s == null)
{
throw new ArgumentNullException("s");
}
if (s.Length == 0)
{
throw new FormatException("Input string was empty.");
}
Match m = FractionParseRegex.Match(s);
if (!m.Success)
{
throw new FormatException("Input string was not in a correct format.");
}
T w;
if (m.Groups["w"].Success)
{
if (!valueHelper.TryParse(m.Groups["w"].Value, out w))
{
throw new FormatException("Whole number in input string was not in a correct format.");
}
}
else
{
w = valueHelper.Zero;
}
if (m.Groups["n"].Success)
{
if (!valueHelper.TryParse(m.Groups["n"].Value, out n))
{
throw new FormatException("Numerator in input string was not in a correct format.");
}
if (!valueHelper.TryParse(m.Groups["d"].Value, out d))
{
throw new FormatException("Denominator in input string was not in a correct format.");
}
}
else
{
n = valueHelper.Zero;
d = valueHelper.PositiveOne;
}
return(w);
}
private static bool TryParse <T>(IValueHelper <T> valueHelper, string s, out T w, out T n, out T d)
where T : struct, IComparable, IFormattable, IConvertible, IComparable <T>, IEquatable <T>
{
Match m;
if (String.IsNullOrEmpty(s) || !(m = FractionParseRegex.Match(s)).Success)
{
w = valueHelper.Zero;
n = valueHelper.Zero;
d = valueHelper.PositiveOne;
return(false);
}
if (m.Groups["w"].Success)
{
if (!valueHelper.TryParse(m.Groups["w"].Value, out w))
{
n = valueHelper.Zero;
d = valueHelper.PositiveOne;
return(false);
}
}
else
{
w = valueHelper.Zero;
}
if (m.Groups["n"].Success)
{
if (!valueHelper.TryParse(m.Groups["n"].Value, out n))
{
d = valueHelper.PositiveOne;
return(false);
}
if (!valueHelper.TryParse(m.Groups["d"].Value, out d))
{
return(false);
}
}
else
{
n = valueHelper.Zero;
d = valueHelper.PositiveOne;
}
return(true);
}