private static bool InDayOfMonthRange(IrIntegerRange range, int year, int month, int dayOfMonth)
{
if (range.Start < 0 || (range.IsRange && range.End < 0))
{
// one of the range values is negative, so we need to convert it to a positive by counting back from the end of the month
var daysInMonth = DateTime.DaysInMonth(year, month);
range = range.CloneWithRevisedRange(
range.Start < 0 ? daysInMonth + range.Start + 1 : range.Start,
range.End < 0 ? daysInMonth + range.End + 1 : range.End
);
}
return InIntegerRange(range, dayOfMonth, DaysInPreviousMonth(year, month), 1);
}
private static bool InIntegerRange(IrIntegerRange range, int value, int lengthOfUnit, int min = 0)
{
if (!range.IsRange)
{
return value == range.Start;
}
if (range.IsHalfOpen && value == range.End)
return false;
if (range.IsSplit) // range spans across the max value and loops back around
{
if (value <= range.End || value >= range.Start)
{
if (range.HasInterval)
{
if (value >= range.Start)
return (value - range.Start) % range.Interval == 0;
return (value + lengthOfUnit - range.Start) % range.Interval == 0;
}
return true;
}
}
else // not a split range (easier case)
{
if (value >= range.Start && value <= range.End)
{
if (range.HasInterval)
return (value - range.Start) % range.Interval == 0;
return true;
}
}
return false;
}
private static bool InDayOfYearRange(IrIntegerRange range, int year, int month, int dayOfYear)
{
if (range.Start < 0 || (range.IsRange && range.End < 0))
{
// one of the range values is negative, so we need to convert it to a positive
var daysInYear = DateTime.IsLeapYear(year) ? 366 : 365;
range = range.CloneWithRevisedRange(
range.Start < 0 ? daysInYear + range.Start + 1 : range.Start,
range.End < 0 ? daysInYear + range.End + 1 : range.End
);
}
var daysInPrevYear = DateTime.IsLeapYear(year-1) ? 366 : 365;
return InIntegerRange(range, dayOfYear, daysInPrevYear);
}