private RomanNumeral ProcessSpecialCases(int number, RomanNumeral max)
{
if (number == max.Number)
{
return null;
}
var greater = RomanNumeralRepository.Numerals.OrderBy(x => x.Number)
.Where(x => max.Number < x.Number);
var less = RomanNumeralRepository.Numerals.OrderByDescending(x => x.Number)
.Where(x => number > x.Number);
var closestGreater = greater.FirstOrDefault();
var nextLess = less.Skip(1).FirstOrDefault();
if (closestGreater == null)
{
return null;
}
var roundedValueToPrecision = ((int)(number / max.Precision) * max.Precision);
if (nextLess != null && roundedValueToPrecision == closestGreater.Number - nextLess.Number)
{
return new RomanNumeral { Number = closestGreater.Number - nextLess.Number, Value = string.Join("", nextLess.Value, closestGreater.Value) };
}
if (roundedValueToPrecision == closestGreater.Number - max.Number)
{
return new RomanNumeral { Number = closestGreater.Number - max.Number, Value = string.Join("", max.Value, closestGreater.Value) };
}
return null;
}
public void Should_parse_94_to_XCIV()
{
var output = new RomanNumeral ().Parse (94);
Assert.That (output, Is.EqualTo ("XCIV"));
}
public void Should_parse_6_to_VI()
{
var output = new RomanNumeral().Parse (6);
Assert.That (output, Is.EqualTo ("VI"));
}
public void Should_parse_50_to_L()
{
var output = new RomanNumeral ().Parse (50);
Assert.That (output, Is.EqualTo ("L"));
}
public void Should_parse_20_to_XX()
{
var output = new RomanNumeral().Parse (20);
Assert.That (output, Is.EqualTo ("XX"));
}
public void Should_parse_1990_to_MCMXC()
{
var output = new RomanNumeral ().Parse (1990);
Assert.That (output, Is.EqualTo ("MCMXC"));
}
public void Should_parse_100_to_C()
{
var output = new RomanNumeral ().Parse (100);
Assert.That (output, Is.EqualTo ("C"));
}
public void Should_parse_two_to_II()
{
var output = new RomanNumeral().Parse (2);
Assert.That (output, Is.EqualTo ("II"));
}