227 lines
7.2 KiB
Objective-C
227 lines
7.2 KiB
Objective-C
/*
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Copyright (C) 2004-2005 SKYRIX Software AG
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Copyright (C) 2006-2012 Inverse inc.
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This file is part of SOPE.
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SOPE is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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SOPE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with SOPE; see the file COPYING. If not, write to the
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Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA.
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*/
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#import <NGExtensions/NSCalendarDate+misc.h>
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#import <NGExtensions/NSObject+Logs.h>
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#import "iCalRecurrenceCalculator.h"
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@interface iCalWeeklyRecurrenceCalculator : iCalRecurrenceCalculator
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@end
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#import <NGExtensions/NGCalendarDateRange.h>
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#import "iCalRecurrenceRule.h"
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#import "iCalByDayMask.h"
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#import "NSCalendarDate+ICal.h"
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@interface iCalRecurrenceCalculator (PrivateAPI)
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- (NSCalendarDate *) lastInstanceStartDate;
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- (unsigned) offsetFromSundayForJulianNumber: (long) _jn;
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- (unsigned) offsetFromSundayForWeekDay: (iCalWeekDay) _weekDay;
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- (unsigned) offsetFromSundayForCurrentWeekStart;
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- (iCalWeekDay) weekDayForJulianNumber: (long) _jn;
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@end
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@implementation iCalWeeklyRecurrenceCalculator
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/**
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* TODO : Unsupported conditions for WEEKLY recurrences :
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*
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* BYYEAR
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* BYYEARDAY
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* BYWEEKNO
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* BYMONTH
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* BYMONTHDAY
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* BYHOUR
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* BYMINUTE
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* WKST
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*
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* There's no GUI to defined such conditions, so there's no
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* problem for now.
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*/
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- (NSArray *) recurrenceRangesWithinCalendarDateRange: (NGCalendarDateRange *) _r
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{
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NSMutableArray *ranges;
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NSCalendarDate *firStart, *startDate, *endDate, *currentStartDate, *currentEndDate;
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long i, repeatCount, count;
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unsigned interval;
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iCalByDayMask *dayMask;
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BOOL hasRepeatCount;
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// [self logWithFormat: @"Weekly %@", rrule];
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firStart = [firstRange startDate];
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startDate = [_r startDate];
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endDate = [_r endDate];
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dayMask = nil;
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repeatCount = 0;
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hasRepeatCount = [rrule hasRepeatCount];
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if ([endDate compare: firStart] == NSOrderedAscending)
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// Range ends before first occurrence
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return nil;
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interval = [rrule repeatInterval];
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if ([[rrule byDay] length])
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dayMask = [rrule byDayMask];
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// If rule is bound, check the bounds
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if (![rrule isInfinite])
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{
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NSCalendarDate *until, *lastDate;
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lastDate = nil;
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until = [rrule untilDate];
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if (until)
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lastDate = until;
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else
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{
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repeatCount = [rrule repeatCount];
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if (dayMask == nil)
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// When there's no BYxxx mask, we can find the date of the last
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// occurrence.
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lastDate = [firStart dateByAddingYears: 0 months: 0
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days: (interval
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* (repeatCount - 1) * 7)];
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}
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if (lastDate != nil)
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{
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if ([lastDate compare: startDate] == NSOrderedAscending)
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// Range starts after last occurrence
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return nil;
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if ([lastDate compare: endDate] == NSOrderedAscending)
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// Range ends after last occurence; adjust end date
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endDate = [lastDate addTimeInterval: [firstRange duration]];
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}
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}
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currentStartDate = [firStart copy];
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[currentStartDate autorelease];
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ranges = [NSMutableArray array];
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count = 0;
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if (dayMask == nil)
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{
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i = 0;
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while ([currentStartDate compare: endDate] == NSOrderedAscending ||
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[currentStartDate compare: endDate] == NSOrderedSame)
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{
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currentEndDate = [currentStartDate addTimeInterval: [firstRange duration]];
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if ([startDate compare: currentEndDate] == NSOrderedAscending)
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{
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NGCalendarDateRange *r;
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r = [NGCalendarDateRange calendarDateRangeWithStartDate: currentStartDate
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endDate: currentEndDate];
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[ranges addObject: r];
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}
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i++;
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currentStartDate = [firStart dateByAddingYears: 0
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months: 0
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days: (interval * i * 7)];
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}
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}
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else
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{
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NGCalendarDateRange *r;
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i = [currentStartDate dayOfWeek]; // Set the first day of the week as Sunday and ignore WKST
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while ([currentStartDate compare: endDate] == NSOrderedAscending ||
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[currentStartDate compare: endDate] == NSOrderedSame)
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{
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BOOL isRecurrence = NO;
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NSInteger week;
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currentEndDate = [currentStartDate addTimeInterval: [firstRange duration]];
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if (hasRepeatCount ||
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[startDate compare: currentEndDate] == NSOrderedAscending)
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{
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// If the rule count is defined, stop once the count is reached.
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if ([currentStartDate compare: firStart] == NSOrderedSame)
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{
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// Always add the start date of the recurring event if within
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// the lookup range.
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isRecurrence = YES;
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}
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else
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{
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week = i / 7;
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if ((week % interval) == 0 &&
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[dayMask occursOnDay: [currentStartDate dayOfWeek]])
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isRecurrence = YES;
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}
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if (isRecurrence)
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{
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count++;
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if (repeatCount > 0 && count > repeatCount)
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break;
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r = [NGCalendarDateRange calendarDateRangeWithStartDate: currentStartDate
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endDate: currentEndDate];
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if ([_r doesIntersectWithDateRange: r])
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{
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[ranges addObject: r];
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// [self logWithFormat: @"Add range %@ - %@", [r startDate], [r endDate]];
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}
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}
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}
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currentStartDate = [currentStartDate dateByAddingYears: 0
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months: 0
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days: 1];
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i++;
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}
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}
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return ranges;
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}
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- (NSCalendarDate *) lastInstanceStartDate
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{
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NSCalendarDate *firStart, *lastInstanceStartDate;
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NGCalendarDateRange *r;
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NSArray *instances;
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lastInstanceStartDate = nil;
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if ([rrule repeatCount] > 0)
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{
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firStart = [firstRange startDate];
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r = [NGCalendarDateRange calendarDateRangeWithStartDate: firStart
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endDate: [NSCalendarDate distantFuture]];
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instances = [self recurrenceRangesWithinCalendarDateRange: r];
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if ([instances count])
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lastInstanceStartDate = [(NGCalendarDateRange *)[instances lastObject] startDate];
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}
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else
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lastInstanceStartDate = [super lastInstanceStartDate];
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return lastInstanceStartDate;
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}
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@end /* iCalWeeklyRecurrenceCalculator */
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