public RangeRule(int from, int to, int numberOfDigits)
{
if (numberOfDigits <= 0)
{
throw new ArgumentOutOfRangeException(nameof(numberOfDigits));
}
if (to < from)
{
throw new ArgumentOutOfRangeException(nameof(to), "to must be > than from");
}
if (to > Math.Pow(to, numberOfDigits))
{
throw new ArgumentOutOfRangeException(nameof(to));
}
if (from > Math.Pow(from, numberOfDigits))
{
throw new ArgumentOutOfRangeException(nameof(from));
}
NumberOfDigits = numberOfDigits;
_digitsFrom = new int[numberOfDigits];
_digitsTo = new int[numberOfDigits];
for (int i = 1; i <= numberOfDigits; i++)
{
_digitsFrom[i - 1] = DigitHelper.NthDigit(from, i);
_digitsTo[i - 1] = DigitHelper.NthDigit(to, i);
}
}
private bool IsMatch(int number)
{
//Start with largest power
for (var i = NumberOfDigits; i >= 1; i--)
{
var nthDigitOfNumber = DigitHelper.NthDigit(number, i);
if (nthDigitOfNumber < _digitsFrom[i - 1])
{
return(false);
}
if (nthDigitOfNumber > _digitsTo[i - 1])
{
return(false);
}
if (nthDigitOfNumber < _digitsTo[i - 1])
{
return(true);
}
}
return(true);
}