321 lines
9.2 KiB
Objective-C
321 lines
9.2 KiB
Objective-C
/* iCalTimeZonePeriod.m - this file is part of SOPE
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*
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* Copyright (C) 2006-2014 Inverse inc.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#import <Foundation/NSArray.h>
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#import <Foundation/NSCalendarDate.h>
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#import <Foundation/NSString.h>
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#import <Foundation/NSTimeZone.h>
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#import "iCalDateTime.h"
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#import "iCalRecurrenceRule.h"
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#import "iCalByDayMask.h"
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#import "iCalUTCOffset.h"
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#import "iCalTimeZonePeriod.h"
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@implementation iCalTimeZonePeriod
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- (Class) classForTag: (NSString *) classTag
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{
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Class tagClass;
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if ([classTag isEqualToString: @"RRULE"])
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tagClass = [iCalRecurrenceRule class];
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else if ([classTag isEqualToString: @"RDATE"])
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tagClass = [iCalDateTime class];
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else if ([classTag isEqualToString: @"DTSTART"])
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tagClass = [iCalDateTime class];
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else if ([classTag isEqualToString: @"TZOFFSETFROM"]
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|| [classTag isEqualToString: @"TZOFFSETTO"])
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tagClass = [iCalUTCOffset class];
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else if ([classTag isEqualToString: @"TZNAME"])
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tagClass = [CardElement class];
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else
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tagClass = [super classForTag: classTag];
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return tagClass;
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}
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- (int) _secondsOfOffset: (NSString *) offsetName
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{
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NSString *offsetTo;
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BOOL negative;
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NSRange cursor;
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unsigned int length;
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unsigned int seconds;
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seconds = 0;
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offsetTo = [[self uniqueChildWithTag: offsetName]
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flattenedValuesForKey: @""];
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length = [offsetTo length];
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if (!length)
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return seconds;
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negative = [offsetTo hasPrefix: @"-"];
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if (negative)
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{
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length--;
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cursor = NSMakeRange(1, 2);
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}
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else if ([offsetTo hasPrefix: @"+"])
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{
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length--;
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cursor = NSMakeRange(1, 2);
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}
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else
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cursor = NSMakeRange(0, 2);
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seconds = 3600 * [[offsetTo substringWithRange: cursor] intValue];
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cursor.location += 2;
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seconds += 60 * [[offsetTo substringWithRange: cursor] intValue];
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if (length == 6)
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{
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cursor.location += 2;
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seconds += [[offsetTo substringWithRange: cursor] intValue];
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}
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return ((negative) ? -seconds : seconds);
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}
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// - (unsigned int) dayOfWeekFromRruleDay: (iCalWeekDay) day
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// {
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// unsigned int dayOfWeek;
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// dayOfWeek = 0;
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// while (day >> (dayOfWeek + 1))
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// dayOfWeek++;
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// return dayOfWeek;
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// }
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- (void) dealloc
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{
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[startDate release];
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[super dealloc];
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}
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- (NSCalendarDate *) startDate
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{
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if (!startDate)
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{
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startDate = [(iCalDateTime *) [self uniqueChildWithTag: @"dtstart"]
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dateTime];
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[startDate retain];
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}
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return startDate;
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}
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- (iCalRecurrenceRule *) recurrenceRule
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{
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return (iCalRecurrenceRule *) [self firstChildWithTag: @"rrule"];
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}
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/**
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* This method returns the date corresponding for to the start of the period
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* in the year of the reference date.
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* We assume that a RRULE for a timezone will always be YEARLY with a BYMONTH
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* and a BYDAY rule.
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*/
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- (NSCalendarDate *) _occurrenceForDate: (NSCalendarDate *) refDate
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byRRule: (iCalRecurrenceRule *) rrule
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{
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NSCalendarDate *tmpDate;
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iCalByDayMask *byDayMask;
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int dayOfWeek, dateDayOfWeek, offset, pos;
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NSCalendarDate *tzStart;
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byDayMask = [rrule byDayMask];
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dayOfWeek = 0;
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if (byDayMask == nil)
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{
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dayOfWeek = 0;
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pos = 1;
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}
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else
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{
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dayOfWeek = (int)[byDayMask firstDay];
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pos = [byDayMask firstOccurrence];
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}
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tzStart = [self startDate];
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[tzStart setTimeZone: [NSTimeZone timeZoneWithName: @"GMT"]];
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tmpDate = [NSCalendarDate dateWithYear: [refDate yearOfCommonEra]
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month: [[[rrule byMonth] objectAtIndex: 0] intValue]
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day: 1
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hour: [tzStart hourOfDay]
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minute: [tzStart minuteOfHour] second: 0
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timeZone: [NSTimeZone timeZoneWithName: @"GMT"]];
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tmpDate = [tmpDate addYear: 0
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month: ((pos > 0) ? 0 : 1)
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day: 0
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hour: 0
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minute: 0
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second: 0];
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/* If the day of the time change is "-XSU", we need to determine whether the
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first day of next month is in the same week. In practice, as most time
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changes occurs on sundays, it will be false only when that first day is a
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sunday, but we want to remain algorithmically exact. */
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dateDayOfWeek = [tmpDate dayOfWeek];
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if (dateDayOfWeek > dayOfWeek && pos < 0)
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pos++;
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/* We check if the days of the week are identical. This is important because if they
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are, "pos" actually includes the first day of tmpDate which means we must decrement
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pos by 1. This happens for example in the eastern timezone (America/Montreal)
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in 2015. We have:
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BEGIN:VTIMEZONE
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TZID:America/Montreal
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X-LIC-LOCATION:America/Montreal
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BEGIN:DAYLIGHT
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TZOFFSETFROM:-0500
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TZOFFSETTO:-0400
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TZNAME:EDT
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DTSTART:19700308T020000
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RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
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END:DAYLIGHT
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BEGIN:STANDARD
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TZOFFSETFROM:-0400
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TZOFFSETTO:-0500
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TZNAME:EST
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DTSTART:19701101T020000
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RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU
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END:STANDARD
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END:VTIMEZONE
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The time changes occur on a Sunday, but in March, the 1st is a Sunday itself and in November
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the 1st is also a Sunday. If we don't decrement "pos" by one, tmpDate (which is set to March or November 1st
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because of "day: 1" will have 14 more days added for March and 7 more days added for November - which will
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effectively shift the time change by a whole week.
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In Europe/Berlin, we have a different use-case for November. In 2015, November 1st is a Sunday.
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The time change in November must occur on October 25th but since tmpDate will be November 1st,
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so a Sunday, dateDayOfWeek will be 0 and dayOfWeek will also be 0 we would decrement tmpDate by 14 days,
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which is incorrect because it would shift the timezone change one week earlier. We take care about this
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one with check if pos is greater or equal than 0 and if so, we don't decrement it.
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BEGIN:VCALENDAR
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PRODID:-//Inverse inc.//NONSGML Olson 2014g//EN
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VERSION:2.0
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BEGIN:VTIMEZONE
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TZID:Europe/Berlin
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X-LIC-LOCATION:Europe/Berlin
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BEGIN:DAYLIGHT
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TZOFFSETFROM:+0100
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TZOFFSETTO:+0200
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TZNAME:CEST
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DTSTART:19700329T020000
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RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
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END:DAYLIGHT
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BEGIN:STANDARD
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TZOFFSETFROM:+0200
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TZOFFSETTO:+0100
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TZNAME:CET
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DTSTART:19701025T030000
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RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
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END:STANDARD
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END:VTIMEZONE
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END:VCALENDAR
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*/
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if (dayOfWeek == dateDayOfWeek && pos >= 0)
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pos--;
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offset = (dayOfWeek - dateDayOfWeek) + (pos * 7);
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tmpDate = [tmpDate addYear: 0 month: 0 day: offset
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hour: 0 minute: 0 second: 0];
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return tmpDate;
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}
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- (NSCalendarDate *) _occurrenceFromRdate: (NSCalendarDate *) refDate
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rDates: (NSArray *) rDatesIn;
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{
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NSArray *rDates;
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NSEnumerator *dateList;
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NSCalendarDate *rDateCur, *rDateOut;
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NSString *dateString;
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unsigned i;
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rDateCur = nil;
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rDateOut = nil;
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dateList = [rDatesIn objectEnumerator];
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while ((dateString = [dateList nextObject]))
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{
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rDates = [(iCalDateTime*) dateString dateTimes];
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for (i = 0; i < [rDates count]; i++)
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{
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rDateCur = [rDates objectAtIndex: i];
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if (!rDateOut || ([rDateCur yearOfCommonEra] > [rDateOut yearOfCommonEra] && [refDate yearOfCommonEra] >= [rDateCur yearOfCommonEra]))
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rDateOut = rDateCur;
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}
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}
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return rDateOut;
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}
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- (NSCalendarDate *) occurrenceForDate: (NSCalendarDate *) refDate;
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{
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NSCalendarDate *tmpDate;
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iCalRecurrenceRule *rrule;
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NSArray *rDates;
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tmpDate = nil;
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rrule = (iCalRecurrenceRule *) [self uniqueChildWithTag: @"rrule"];
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rDates = (NSArray *) [self childrenWithTag: @"rdate"];
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if ([rDates count])
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{
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tmpDate = [self _occurrenceFromRdate: refDate rDates: rDates];
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return tmpDate;
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}
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if ([rrule isVoid])
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tmpDate
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= [(iCalDateTime *) [self uniqueChildWithTag: @"dtstart"] dateTime];
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else if ([rrule untilDate] == nil || [refDate compare: [rrule untilDate]] == NSOrderedAscending)
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tmpDate = [self _occurrenceForDate: refDate byRRule: rrule];
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else if ([refDate compare: [rrule untilDate]] == NSOrderedDescending)
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tmpDate = [rrule untilDate];
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return tmpDate;
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}
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- (int) secondsOffsetFromGMT
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{
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return [self _secondsOfOffset: @"tzoffsetto"];
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}
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- (NSComparisonResult) compare: (iCalTimeZonePeriod *) otherPeriod
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{
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return [[self startDate] compare: [otherPeriod startDate]];
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}
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@end
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