private ParseResult <AnnualDate>?DetermineMonth(PatternFields usedFields, string text)
{
switch (usedFields & (PatternFields.MonthOfYearNumeric | PatternFields.MonthOfYearText))
{
case PatternFields.MonthOfYearNumeric:
// No-op
break;
case PatternFields.MonthOfYearText:
MonthOfYearNumeric = MonthOfYearText;
break;
case PatternFields.MonthOfYearNumeric | PatternFields.MonthOfYearText:
if (MonthOfYearNumeric != MonthOfYearText)
{
return(ParseResult <AnnualDate> .InconsistentMonthValues(text));
}
// No need to change MonthOfYearNumeric - this was just a check
break;
case 0:
MonthOfYearNumeric = TemplateValue.Month;
break;
}
if (MonthOfYearNumeric > CalendarSystem.Iso.GetMonthsInYear(2000))
{
return(ParseResult <AnnualDate> .IsoMonthOutOfRange(text, MonthOfYearNumeric));
}
return(null);
}
