1b2bf35976
Monotone-Revision: 7405c75e35bf1ceda3ee53a96c803205631f7d60 Monotone-Author: wsourdeau@inverse.ca Monotone-Date: 2007-02-08T16:27:08 Monotone-Branch: ca.inverse.sogo
142 lines
3.8 KiB
Objective-C
142 lines
3.8 KiB
Objective-C
/* iCalTimeZonePeriod.m - this file is part of SOPE
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*
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* Copyright (C) 2006 Inverse groupe conseil
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*
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* Author: Wolfgang Sourdeau <wsourdeau@inverse.ca>
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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/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 "CardGroup+iCal.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: @"DTSTART"])
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tagClass = [iCalDateTime class];
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else if ([classTag isEqualToString: @"TZNAME"]
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|| [classTag isEqualToString: @"TZOFFSETFROM"]
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|| [classTag isEqualToString: @"TZOFFSETTO"])
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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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value: 0];
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length = [offsetTo length];
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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 = 1;
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while (day >> dayOfWeek)
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dayOfWeek++;
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return dayOfWeek;
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}
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- (NSCalendarDate *) occurenceForDate: (NSCalendarDate *) refDate;
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{
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NSCalendarDate *tmpDate;
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iCalRecurrenceRule *rrule;
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NSString *byDay;
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int dayOfWeek, dateDayOfWeek, offset, pos;
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rrule = (iCalRecurrenceRule *) [self uniqueChildWithTag: @"rrule"];
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byDay = [rrule namedValue: @"byday"];
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dayOfWeek = [self dayOfWeekFromRruleDay: [rrule byDayMask]];
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pos = [[byDay substringToIndex: 2] intValue];
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if (!pos)
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pos = 1;
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tmpDate = [NSCalendarDate
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dateWithYear: [refDate yearOfCommonEra]
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month: [[rrule namedValue: @"bymonth"] intValue]
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day: 1 hour: 0 minute: 0 second: 0
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timeZone: [NSTimeZone timeZoneWithName: @"GMT"]];
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tmpDate = [tmpDate addYear: 0 month: ((pos > 0) ? 0 : 1)
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day: 0 hour: 0 minute: 0
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second: -[self _secondsOfOffset: @"tzoffsetfrom"]];
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dateDayOfWeek = [tmpDate dayOfWeek];
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offset = (dayOfWeek - dateDayOfWeek);
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if (pos > 0 && offset < 0)
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offset += 7;
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offset += (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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- (int) secondsOffsetFromGMT
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{
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return [self _secondsOfOffset: @"tzoffsetto"];
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}
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@end
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