private void DetermineWhen(ref LexerToken tok, ref DateSpecifier specifier)
{
Date today = TimesCommon.Current.CurrentDate;
specifier = specifier ?? new DateSpecifier();
switch (tok.Kind)
{
case LexerTokenKindEnum.TOK_DATE:
specifier = tok.Value.GetValue <DateSpecifier>();
break;
case LexerTokenKindEnum.TOK_INT:
{
int amount = tok.Value.GetValue <int>();
int adjust = 0;
tok = Lexer.PeekToken();
LexerTokenKindEnum kind = tok.Kind;
switch (kind)
{
case LexerTokenKindEnum.TOK_YEAR:
case LexerTokenKindEnum.TOK_YEARS:
case LexerTokenKindEnum.TOK_QUARTER:
case LexerTokenKindEnum.TOK_QUARTERS:
case LexerTokenKindEnum.TOK_MONTH:
case LexerTokenKindEnum.TOK_MONTHS:
case LexerTokenKindEnum.TOK_WEEK:
case LexerTokenKindEnum.TOK_WEEKS:
case LexerTokenKindEnum.TOK_DAY:
case LexerTokenKindEnum.TOK_DAYS:
Lexer.NextToken();
tok = Lexer.NextToken();
switch (tok.Kind)
{
case LexerTokenKindEnum.TOK_AGO:
adjust = -1;
break;
case LexerTokenKindEnum.TOK_HENCE:
adjust = 1;
break;
default:
tok.Unexpected();
break;
}
break;
default:
break;
}
Date when = today;
switch (kind)
{
case LexerTokenKindEnum.TOK_YEAR:
case LexerTokenKindEnum.TOK_YEARS:
when = when.AddYears(amount * adjust);
break;
case LexerTokenKindEnum.TOK_QUARTER:
case LexerTokenKindEnum.TOK_QUARTERS:
when = when.AddMonths(amount * 3 * adjust);
break;
case LexerTokenKindEnum.TOK_MONTH:
case LexerTokenKindEnum.TOK_MONTHS:
when = when.AddMonths(amount * adjust);
break;
case LexerTokenKindEnum.TOK_WEEK:
case LexerTokenKindEnum.TOK_WEEKS:
when = when.AddDays(amount * 7 * adjust);
break;
case LexerTokenKindEnum.TOK_DAY:
case LexerTokenKindEnum.TOK_DAYS:
when = when.AddDays(amount * adjust);
break;
default:
if (amount > 31)
{
specifier.Year = amount;
}
else
{
specifier.Day = amount;
}
break;
}
if (adjust != 0)
{
specifier = new DateSpecifier(when);
}
break;
}
case LexerTokenKindEnum.TOK_THIS:
case LexerTokenKindEnum.TOK_NEXT:
case LexerTokenKindEnum.TOK_LAST:
{
int adjust = 0;
if (tok.Kind == LexerTokenKindEnum.TOK_NEXT)
{
adjust = 1;
}
else if (tok.Kind == LexerTokenKindEnum.TOK_LAST)
{
adjust = -1;
}
tok = Lexer.NextToken();
switch (tok.Kind)
{
case LexerTokenKindEnum.TOK_A_MONTH:
{
Date temp = new Date(today.Year, tok.Value.GetValue <int>(), 1);
temp = temp.AddYears(adjust);
specifier = new DateSpecifier(temp.Year, (MonthEnum)temp.Month);
break;
}
case LexerTokenKindEnum.TOK_A_WDAY:
{
Date temp = DateDuration.FindNearest(today, SkipQuantumEnum.WEEKS);
while (temp.DayOfWeek != tok.Value.GetValue <DayOfWeek>())
{
temp = temp.AddDays(1);
}
temp = temp.AddDays(7 * adjust);
specifier = new DateSpecifier(temp);
break;
}
case LexerTokenKindEnum.TOK_YEAR:
{
Date temp = today;
temp = temp.AddYears(adjust);
specifier = new DateSpecifier(temp.Year);
break;
}
case LexerTokenKindEnum.TOK_QUARTER:
{
Date baseDate = DateDuration.FindNearest(today, SkipQuantumEnum.QUARTERS);
Date temp = default(Date);
if (adjust < 0)
{
temp = baseDate.AddMonths(3 * adjust);
}
else if (adjust == 0)
{
temp = baseDate.AddMonths(3);
}
else if (adjust > 0)
{
baseDate = baseDate.AddMonths(3 * adjust);
temp = baseDate.AddMonths(3 * adjust);
}
specifier = new DateSpecifier(adjust < 0 ? temp : baseDate);
break;
}
case LexerTokenKindEnum.TOK_WEEK:
{
Date baseDate = DateDuration.FindNearest(today, SkipQuantumEnum.WEEKS);
Date temp = default(Date);
if (adjust < 0)
{
temp = baseDate.AddDays(7 * adjust);
}
else if (adjust == 0)
{
temp = baseDate.AddDays(7);
}
else if (adjust > 0)
{
baseDate = baseDate.AddDays(7 * adjust);
temp = baseDate.AddDays(7 * adjust);
}
specifier = new DateSpecifier(adjust < 0 ? temp : baseDate);
break;
}
case LexerTokenKindEnum.TOK_DAY:
{
Date temp = today;
temp = temp.AddDays(adjust);
specifier = new DateSpecifier(temp);
break;
}
case LexerTokenKindEnum.TOK_MONTH:
default:
{
Date temp = today;
temp = temp.AddMonths(adjust);
specifier = new DateSpecifier(temp.Year, (MonthEnum)temp.Month);
break;
}
}
break;
}
case LexerTokenKindEnum.TOK_A_MONTH:
specifier.Month = tok.Value.GetValue <MonthEnum>();
tok = Lexer.PeekToken();
switch (tok.Kind)
{
case LexerTokenKindEnum.TOK_INT:
specifier.Year = tok.Value.GetValue <int>();
break;
case LexerTokenKindEnum.END_REACHED:
break;
default:
break;
}
break;
case LexerTokenKindEnum.TOK_A_WDAY:
specifier.WDay = tok.Value.GetValue <DayOfWeek>();
break;
case LexerTokenKindEnum.TOK_TODAY:
specifier = new DateSpecifier(today);
break;
case LexerTokenKindEnum.TOK_TOMORROW:
specifier = new DateSpecifier(today.AddDays(1));
break;
case LexerTokenKindEnum.TOK_YESTERDAY:
specifier = new DateSpecifier(today.AddDays(-1));
break;
default:
tok.Unexpected();
break;
}
}
public void Stabilize(Date?date = null)
{
if (date.HasValue)
{
Logger.Current.Debug("times.interval", () => String.Format("stabilize: with date = {0}", date));
}
if (date.HasValue & !Aligned)
{
Logger.Current.Debug("times.interval", () => "stabilize: date passed, but not aligned");
if (Duration != null)
{
Logger.Current.Debug("times.interval", () => String.Format("stabilize: aligning with a duration: {0}", Duration));
// The interval object has not been seeded with a start date yet, so
// find the nearest period before on on date which fits, if possible.
//
// Find an efficient starting point for the upcoming while loop. We
// want a date early enough that the range will be correct, but late
// enough that we don't spend hundreds of thousands of loops skipping
// through time.
Date?initialStart = Start ?? Begin;
Date?initialFinish = Finish ?? End;
if (initialStart.HasValue)
{
Logger.Current.Debug("times.interval", () => String.Format("stabilize: initial_start = {0}", initialStart));
}
if (initialFinish.HasValue)
{
Logger.Current.Debug("times.interval", () => String.Format("stabilize: initial_finish = {0}", initialFinish));
}
Date when = Start ?? date.Value;
switch (Duration.Quantum)
{
case SkipQuantumEnum.MONTHS:
case SkipQuantumEnum.QUARTERS:
case SkipQuantumEnum.YEARS:
Logger.Current.Debug("times.interval", () => "stabilize: monthly, quarterly or yearly duration");
// These start on most recent period start quantum before when
// DEBUG("times.interval", "stabilize: monthly, quarterly or yearly duration");
Start = DateDuration.FindNearest(when, Duration.Quantum);
break;
case SkipQuantumEnum.WEEKS:
// Weeks start on the beginning of week prior to 400 remainder period length
// Either the first quanta of the period or the last quanta of the period seems more sensible
// implies period is never less than 400 days not too unreasonable
// DEBUG("times.interval", "stabilize: weekly duration");
Logger.Current.Debug("times.interval", () => "stabilize: weekly duration");
int period = Duration.Length * 7;
Start = DateDuration.FindNearest(when.AddDays(-(period + 400 % period)), Duration.Quantum);
break;
default:
// multiples of days have a quanta of 1 day so should not have the start date adjusted to a quanta
Logger.Current.Debug("times.interval", () => "stabilize: daily duration - stable by definition");
Start = when;
break;
}
Logger.Current.Debug("times.interval", () => String.Format("stabilize: beginning start date = {0}", Start));
while (Start < date)
{
DateInterval nextInterval = new DateInterval(this);
nextInterval++;
if (nextInterval.Start.HasValue && nextInterval.Start <= date)
{
Assign(nextInterval);
}
else
{
EndOfDuration = null;
Next = null;
break;
}
}
Logger.Current.Debug("times.interval", () => String.Format("stabilize: proposed start date = {0}", Start));
if (initialStart.HasValue && (!Start.HasValue || Start < initialStart))
{
// Using the discovered start, find the end of the period
ResolveEnd();
Start = initialStart;
Logger.Current.Debug("times.interval", () => "stabilize: start reset to initial start");
}
if (initialFinish.HasValue && (!Finish.HasValue || Finish > initialFinish))
{
Finish = initialFinish;
Logger.Current.Debug("times.interval", () => "stabilize: finish reset to initial finish");
}
if (Start.HasValue)
{
Logger.Current.Debug("times.interval", () => String.Format("stabilize: final start = {0}", Start));
}
if (Finish.HasValue)
{
Logger.Current.Debug("times.interval", () => String.Format("stabilize: final finish = {0}", Finish));
}
}
else if (Range != null)
{
Start = Range.Begin;
Finish = Range.End;
}
Aligned = true;
}
// If there is no duration, then if we've reached here the date falls
// between start and finish.
if (Duration == null)
{
Logger.Current.Debug("times.interval", () => "stabilize: there was no duration given");
if (!Start.HasValue && !Finish.HasValue)
{
throw new DateError(DateError.ErrorMessageInvalidDateIntervalNeitherStartNorFinishNorDuration);
}
}
else
{
ResolveEnd();
}
}
/// <summary>
/// Ported from date_parser_t::parse()
/// </summary>
public DateInterval Parse()
{
DateSpecifier sinceSpecifier = null;
DateSpecifier untilSpecifier = null;
DateSpecifier inclusionSpecifier = null;
DateInterval period = new DateInterval();
Date today = TimesCommon.Current.CurrentDate;
bool endInclusive = false;
for (LexerToken tok = Lexer.NextToken(); tok.Kind != LexerTokenKindEnum.END_REACHED; tok = Lexer.NextToken())
{
switch (tok.Kind)
{
case LexerTokenKindEnum.TOK_DATE:
case LexerTokenKindEnum.TOK_INT:
case LexerTokenKindEnum.TOK_A_MONTH:
case LexerTokenKindEnum.TOK_A_WDAY:
DetermineWhen(ref tok, ref inclusionSpecifier);
break;
case LexerTokenKindEnum.TOK_DASH:
if (inclusionSpecifier != null)
{
sinceSpecifier = inclusionSpecifier;
inclusionSpecifier = null;
tok = Lexer.NextToken();
DetermineWhen(ref tok, ref untilSpecifier);
// The dash operator is special: it has an _inclusive_ end.
endInclusive = true;
}
else
{
tok.Unexpected();
}
break;
case LexerTokenKindEnum.TOK_SINCE:
if (sinceSpecifier != null)
{
tok.Unexpected();
}
else
{
tok = Lexer.NextToken();
DetermineWhen(ref tok, ref sinceSpecifier);
}
break;
case LexerTokenKindEnum.TOK_UNTIL:
if (untilSpecifier != null)
{
tok.Unexpected();
}
else
{
tok = Lexer.NextToken();
DetermineWhen(ref tok, ref untilSpecifier);
}
break;
case LexerTokenKindEnum.TOK_IN:
if (inclusionSpecifier != null)
{
tok.Unexpected();
}
else
{
tok = Lexer.NextToken();
DetermineWhen(ref tok, ref inclusionSpecifier);
}
break;
case LexerTokenKindEnum.TOK_THIS:
case LexerTokenKindEnum.TOK_NEXT:
case LexerTokenKindEnum.TOK_LAST:
{
int adjust = 0;
if (tok.Kind == LexerTokenKindEnum.TOK_NEXT)
{
adjust = 1;
}
else if (tok.Kind == LexerTokenKindEnum.TOK_LAST)
{
adjust = -1;
}
tok = Lexer.NextToken();
switch (tok.Kind)
{
case LexerTokenKindEnum.TOK_INT:
{
int amount = tok.Value.GetValue <int>();
Date baseDate = today;
Date end = today;
if (adjust == 0)
{
adjust = 1;
}
tok = Lexer.NextToken();
switch (tok.Kind)
{
case LexerTokenKindEnum.TOK_YEARS:
baseDate = baseDate.AddYears(amount * adjust);
break;
case LexerTokenKindEnum.TOK_QUARTERS:
baseDate = baseDate.AddMonths(amount * adjust * 3);
break;
case LexerTokenKindEnum.TOK_MONTHS:
baseDate = baseDate.AddMonths(amount * adjust);
break;
case LexerTokenKindEnum.TOK_WEEKS:
baseDate = baseDate.AddDays(amount * adjust * 7);
break;
case LexerTokenKindEnum.TOK_DAYS:
baseDate = baseDate.AddDays(amount * adjust);
break;
default:
tok.Unexpected();
break;
}
if (adjust > 0)
{
Date temp = baseDate;
baseDate = end;
end = temp;
}
sinceSpecifier = new DateSpecifier(baseDate);
untilSpecifier = new DateSpecifier(end);
break;
}
case LexerTokenKindEnum.TOK_A_MONTH:
{
DetermineWhen(ref tok, ref inclusionSpecifier);
Date temp = new Date(today.Year, (int)inclusionSpecifier.Month, 1);
temp = temp.AddYears(adjust);
inclusionSpecifier = new DateSpecifier(temp.Year, (MonthEnum)temp.Month);
break;
}
case LexerTokenKindEnum.TOK_A_WDAY:
{
DetermineWhen(ref tok, ref inclusionSpecifier);
Date temp = DateDuration.FindNearest(today, SkipQuantumEnum.WEEKS);
while (temp.DayOfWeek != inclusionSpecifier.WDay)
{
temp = temp.AddDays(1);
}
temp = temp.AddDays(7 * adjust);
inclusionSpecifier = new DateSpecifier(temp);
break;
}
case LexerTokenKindEnum.TOK_YEAR:
{
Date temp = today;
temp = temp.AddYears(adjust);
inclusionSpecifier = new DateSpecifier(temp.Year);
break;
}
case LexerTokenKindEnum.TOK_QUARTER:
{
Date baseDate = DateDuration.FindNearest(today, SkipQuantumEnum.QUARTERS);
Date temp;
if (adjust < 0)
{
temp = baseDate.AddMonths(3 * adjust);
}
else if (adjust == 0)
{
temp = baseDate.AddMonths(3);
}
else
{
baseDate = baseDate.AddMonths(3 * adjust);
temp = baseDate.AddMonths(3 * adjust);
}
sinceSpecifier = new DateSpecifier(adjust < 0 ? temp : baseDate);
untilSpecifier = new DateSpecifier(adjust < 0 ? baseDate : temp);
break;
}
case LexerTokenKindEnum.TOK_WEEK:
{
Date baseDate = DateDuration.FindNearest(today, SkipQuantumEnum.WEEKS);
Date temp;
if (adjust < 0)
{
temp = baseDate.AddDays(7 * adjust);
}
else if (adjust == 0)
{
temp = baseDate.AddDays(7);
}
else
{
baseDate = baseDate.AddDays(7 * adjust);
temp = baseDate.AddDays(7 * adjust);
}
sinceSpecifier = new DateSpecifier(adjust < 0 ? temp : baseDate);
untilSpecifier = new DateSpecifier(adjust < 0 ? baseDate : temp);
break;
}
case LexerTokenKindEnum.TOK_DAY:
{
Date temp = today;
temp = temp.AddDays(adjust);
inclusionSpecifier = new DateSpecifier(temp);
break;
}
case LexerTokenKindEnum.TOK_MONTH:
default:
{
Date temp = today;
temp = temp.AddMonths(adjust);
inclusionSpecifier = new DateSpecifier(temp.Year, (MonthEnum)temp.Month);
break;
}
}
break;
}
case LexerTokenKindEnum.TOK_TODAY:
inclusionSpecifier = new DateSpecifier(today);
break;
case LexerTokenKindEnum.TOK_TOMORROW:
inclusionSpecifier = new DateSpecifier(today.AddDays(1));
break;
case LexerTokenKindEnum.TOK_YESTERDAY:
inclusionSpecifier = new DateSpecifier(today.AddDays(-1));
break;
case LexerTokenKindEnum.TOK_EVERY:
tok = Lexer.NextToken();
if (tok.Kind == LexerTokenKindEnum.TOK_INT)
{
int quantity = tok.Value.GetValue <int>();
tok = Lexer.NextToken();
switch (tok.Kind)
{
case LexerTokenKindEnum.TOK_YEARS:
period.Duration = new DateDuration(SkipQuantumEnum.YEARS, quantity);
break;
case LexerTokenKindEnum.TOK_QUARTERS:
period.Duration = new DateDuration(SkipQuantumEnum.QUARTERS, quantity);
break;
case LexerTokenKindEnum.TOK_MONTHS:
period.Duration = new DateDuration(SkipQuantumEnum.MONTHS, quantity);
break;
case LexerTokenKindEnum.TOK_WEEKS:
period.Duration = new DateDuration(SkipQuantumEnum.WEEKS, quantity);
break;
case LexerTokenKindEnum.TOK_DAYS:
period.Duration = new DateDuration(SkipQuantumEnum.DAYS, quantity);
break;
default:
tok.Unexpected();
break;
}
}
else
{
switch (tok.Kind)
{
case LexerTokenKindEnum.TOK_YEAR:
period.Duration = new DateDuration(SkipQuantumEnum.YEARS, 1);
break;
case LexerTokenKindEnum.TOK_QUARTER:
period.Duration = new DateDuration(SkipQuantumEnum.QUARTERS, 1);
break;
case LexerTokenKindEnum.TOK_MONTH:
period.Duration = new DateDuration(SkipQuantumEnum.MONTHS, 1);
break;
case LexerTokenKindEnum.TOK_WEEK:
period.Duration = new DateDuration(SkipQuantumEnum.WEEKS, 1);
break;
case LexerTokenKindEnum.TOK_DAY:
period.Duration = new DateDuration(SkipQuantumEnum.DAYS, 1);
break;
default:
tok.Unexpected();
break;
}
}
break;
case LexerTokenKindEnum.TOK_YEARLY:
period.Duration = new DateDuration(SkipQuantumEnum.YEARS, 1);
break;
case LexerTokenKindEnum.TOK_QUARTERLY:
period.Duration = new DateDuration(SkipQuantumEnum.QUARTERS, 1);
break;
case LexerTokenKindEnum.TOK_BIMONTHLY:
period.Duration = new DateDuration(SkipQuantumEnum.MONTHS, 2);
break;
case LexerTokenKindEnum.TOK_MONTHLY:
period.Duration = new DateDuration(SkipQuantumEnum.MONTHS, 1);
break;
case LexerTokenKindEnum.TOK_BIWEEKLY:
period.Duration = new DateDuration(SkipQuantumEnum.WEEKS, 2);
break;
case LexerTokenKindEnum.TOK_WEEKLY:
period.Duration = new DateDuration(SkipQuantumEnum.WEEKS, 1);
break;
case LexerTokenKindEnum.TOK_DAILY:
period.Duration = new DateDuration(SkipQuantumEnum.DAYS, 1);
break;
default:
tok.Unexpected();
break;
}
}
if (sinceSpecifier != null || untilSpecifier != null)
{
DateRange range = new DateRange(sinceSpecifier, untilSpecifier)
{
EndExclusive = endInclusive
};
period.Range = new DateSpecifierOrRange(range);
}
else if (inclusionSpecifier != null)
{
period.Range = new DateSpecifierOrRange(inclusionSpecifier);
}
else
{
/* otherwise, it's something like "monthly", with no date reference */
}
return(period);
}
