internal static ExtendedDateTimePossibilityCollection ToPossibilityCollection(UnspecifiedExtendedDateTime unspecifiedExtendedDateTime)
{
var extendedDateTimePossibilityCollection = new ExtendedDateTimePossibilityCollection();
var extendedDateTimeRange = new ExtendedDateTimeRange();
var startExtendedDateTime = new ExtendedDateTime();
var endExtendedDateTime = new ExtendedDateTime();
extendedDateTimeRange.Start = startExtendedDateTime;
extendedDateTimeRange.End = endExtendedDateTime;
extendedDateTimePossibilityCollection.Add(extendedDateTimeRange);
if (unspecifiedExtendedDateTime.Year.Length != 4) // Year
{
throw new ConversionException("An UnspecifiedExtendedDateTime year must be four characters long.");
}
var yearStartBuffer = new List <char>();
var yearEndBuffer = new List <char>();
for (int i = 0; i < 4; i++)
{
if (unspecifiedExtendedDateTime.Year[0] == 'u')
{
if (i == 0)
{
yearStartBuffer.Add('-');
}
yearStartBuffer.Add('9');
yearEndBuffer.Add('9');
}
else if (unspecifiedExtendedDateTime.Year[i] == 'u')
{
yearStartBuffer.Add('0');
yearEndBuffer.Add('9');
}
else
{
yearStartBuffer.Add(unspecifiedExtendedDateTime.Year[i]);
yearEndBuffer.Add(unspecifiedExtendedDateTime.Year[i]);
}
}
var yearStart = int.Parse(new string(yearStartBuffer.ToArray()));
var yearEnd = int.Parse(new string(yearEndBuffer.ToArray()));
if (unspecifiedExtendedDateTime.Month == null) // Month
{
startExtendedDateTime.Year = yearStart;
endExtendedDateTime.Year = yearEnd;
return(extendedDateTimePossibilityCollection);
}
if (unspecifiedExtendedDateTime.Month.Length != 2)
{
throw new ConversionException("A month must be two characters long.");
}
var monthStartBuffer = new List <char>();
var monthEndBuffer = new List <char>();
var isFirstMonthDigitUnspecified = false;
if (unspecifiedExtendedDateTime.Month[0] == 'u')
{
monthStartBuffer.Add('0');
monthEndBuffer.Add('1');
isFirstMonthDigitUnspecified = true;
}
else
{
monthStartBuffer.Add(unspecifiedExtendedDateTime.Month[0]);
monthEndBuffer.Add(unspecifiedExtendedDateTime.Month[0]);
}
if (unspecifiedExtendedDateTime.Month[1] == 'u')
{
if (isFirstMonthDigitUnspecified)
{
monthStartBuffer.Add('1');
monthEndBuffer.Add('2');
}
else
{
var firstDigit = int.Parse(unspecifiedExtendedDateTime.Month[0].ToString());
if (firstDigit == 0)
{
monthStartBuffer.Add('1');
monthEndBuffer.Add('9');
}
else if (firstDigit == 1)
{
monthStartBuffer.Add('0');
monthEndBuffer.Add('2');
}
else
{
throw new ConversionException("A month must be between 1 and 12.");
}
}
}
else
{
if (isFirstMonthDigitUnspecified)
{
var secondDigit = int.Parse(unspecifiedExtendedDateTime.Month[1].ToString());
if (secondDigit > 2) // Month must be in the range of 01 to 09
{
monthEndBuffer[0] = '0';
}
}
monthStartBuffer.Add(unspecifiedExtendedDateTime.Month[1]);
monthEndBuffer.Add(unspecifiedExtendedDateTime.Month[1]);
}
var monthStart = int.Parse(new string(monthStartBuffer.ToArray()));
var monthEnd = int.Parse(new string(monthEndBuffer.ToArray()));
if (unspecifiedExtendedDateTime.Day == null) // Day
{
startExtendedDateTime.Year = yearStart;
startExtendedDateTime.Month = monthStart;
endExtendedDateTime.Year = yearEnd;
endExtendedDateTime.Month = monthEnd;
return(extendedDateTimePossibilityCollection);
}
if (unspecifiedExtendedDateTime.Day.Length != 2)
{
throw new ConversionException("A day must be two characters long.");
}
var dayStartBuffer = new List <char>();
var dayEndBuffer = new List <char>();
var daysInEndMonth = ExtendedDateTimeCalculator.DaysInMonth(yearEnd, monthEnd);
var isFirstDayDigitUnspecified = false;
if (unspecifiedExtendedDateTime.Day[0] == 'u')
{
dayStartBuffer.Add('0');
dayEndBuffer.Add(daysInEndMonth.ToString()[0]);
isFirstDayDigitUnspecified = true;
}
else
{
dayStartBuffer.Add(unspecifiedExtendedDateTime.Day[0]);
dayEndBuffer.Add(unspecifiedExtendedDateTime.Day[0]);
}
if (unspecifiedExtendedDateTime.Day[1] == 'u')
{
if (isFirstDayDigitUnspecified)
{
dayStartBuffer.Add('1');
dayEndBuffer.Add(daysInEndMonth.ToString()[1]);
}
else
{
var firstDigit = int.Parse(unspecifiedExtendedDateTime.Day[0].ToString());
if (firstDigit == 0) // Day is 01 to 09
{
dayStartBuffer.Add('1');
dayEndBuffer.Add('9');
}
else if (firstDigit == 1) // Day is 10 to 19
{
dayStartBuffer.Add('0');
dayEndBuffer.Add('9');
}
else if (firstDigit == 2) // Day is 20 to 28 (if end month is February in a non-leap year) or 29
{
dayStartBuffer.Add('0');
if (daysInEndMonth == 28)
{
dayEndBuffer.Add('8');
}
else
{
dayEndBuffer.Add('9');
}
}
else if (firstDigit == 3) // Day is 30 to 30 or 31 (depending on end month)
{
dayStartBuffer.Add('0');
if (daysInEndMonth == 30)
{
dayEndBuffer.Add('0');
}
else
{
dayEndBuffer.Add('1');
}
}
else
{
throw new ConversionException("A day must be between 1 and either 28, 29, 30, or 31 depending on the month.");
}
}
}
else
{
if (isFirstDayDigitUnspecified)
{
var secondDigit = int.Parse(unspecifiedExtendedDateTime.Day[1].ToString());
if (secondDigit > daysInEndMonth.ToString()[1]) // Decrement the first digit of the end day.
{
dayEndBuffer[0] = (int.Parse(dayEndBuffer[0].ToString()) - 1).ToString()[0];
}
}
dayStartBuffer.Add(unspecifiedExtendedDateTime.Day[1]);
dayEndBuffer.Add(unspecifiedExtendedDateTime.Day[1]);
}
var dayStart = int.Parse(new string(dayStartBuffer.ToArray()));
var dayEnd = int.Parse(new string(dayEndBuffer.ToArray()));
var rangeBuffer = new List <ExtendedDateTime>(); // Collects consecutive dates, which are then converted into an ExtendedDateTimeRange.
extendedDateTimePossibilityCollection.Clear();
for (var year = yearStart; year <= yearEnd; year++)
{
for (var month = monthStart; month <= monthEnd; month++)
{
for (var day = dayStart; day <= dayEnd; day++)
{
if (day > ExtendedDateTimeCalculator.DaysInMonth(year, month))
{
if (rangeBuffer.Count == 1)
{
extendedDateTimePossibilityCollection.Add(new ExtendedDateTime(year, month, day));
rangeBuffer.Clear();
}
else if (rangeBuffer.Count > 0)
{
extendedDateTimePossibilityCollection.Add(new ExtendedDateTimeRange(rangeBuffer.First(), rangeBuffer.Last()));
rangeBuffer.Clear();
}
}
else
{
rangeBuffer.Add(new ExtendedDateTime(year, month, day));
}
if (day == dayEnd)
{
if (rangeBuffer.Count == 1)
{
extendedDateTimePossibilityCollection.Add(new ExtendedDateTime(year, month, day));
rangeBuffer.Clear();
}
else if (rangeBuffer.Count > 0)
{
extendedDateTimePossibilityCollection.Add(new ExtendedDateTimeRange(rangeBuffer.First(), rangeBuffer.Last()));
rangeBuffer.Clear();
}
}
}
}
}
return(extendedDateTimePossibilityCollection);
}
