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Diffstat (limited to 'calendar/cal-util/cal-recur.c')
| -rw-r--r-- | calendar/cal-util/cal-recur.c | 3974 |
1 files changed, 0 insertions, 3974 deletions
diff --git a/calendar/cal-util/cal-recur.c b/calendar/cal-util/cal-recur.c deleted file mode 100644 index cfccdaf19f..0000000000 --- a/calendar/cal-util/cal-recur.c +++ /dev/null @@ -1,3974 +0,0 @@ -/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */ -/* - * Evolution calendar recurrence rule functions - * - * Copyright (C) 2000 Ximian, Inc. - * - * Author: Damon Chaplin <damon@ximian.com> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of version 2 of the GNU General Public - * License as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. - */ - -#include <config.h> -#include <stdlib.h> -#include <string.h> -#include <cal-util/cal-recur.h> -#include <cal-util/timeutil.h> - - -/* - * Introduction to The Recurrence Generation Functions: - * - * Note: This is pretty complicated. See the iCalendar spec (RFC 2445) for - * the specification of the recurrence rules and lots of examples - * (sections 4.3.10 & 4.8.5). We also want to support the older - * vCalendar spec, though this should be easy since it is basically a - * subset of iCalendar. - * - * o An iCalendar event can have any number of recurrence rules specifying - * occurrences of the event, as well as dates & times of specific - * occurrences. It can also have any number of recurrence rules and - * specific dates & times specifying exceptions to the occurrences. - * So we first merge all the occurrences generated, eliminating any - * duplicates, then we generate all the exceptions and remove these to - * form the final set of occurrences. - * - * o There are 7 frequencies of occurrences: YEARLY, MONTHLY, WEEKLY, DAILY, - * HOURLY, MINUTELY & SECONDLY. The 'interval' property specifies the - * multiples of the frequency which we step by. We generate a 'set' of - * occurrences for each period defined by the frequency & interval. - * So for a YEARLY frequency with an interval of 3, we generate a set of - * occurrences for every 3rd year. We use complete years here - any - * generated occurrences that occur before the event's start (or after its - * end) are just discarded. - * - * o There are 8 frequency modifiers: BYMONTH, BYWEEKNO, BYYEARDAY, BYMONTHDAY, - * BYDAY, BYHOUR, BYMINUTE & BYSECOND. These can either add extra occurrences - * or filter out occurrences. For example 'FREQ=YEARLY;BYMONTH=1,2' produces - * 2 occurrences for each year rather than the default 1. And - * 'FREQ=DAILY;BYMONTH=1' filters out all occurrences except those in Jan. - * If the modifier works on periods which are less than the recurrence - * frequency, then extra occurrences are added, otherwise occurrences are - * filtered. So we have 2 functions for each modifier - one to expand events - * and the other to filter. We use a table of functions for each frequency - * which points to the appropriate function to use for each modifier. - * - * o Any number of frequency modifiers can be used in a recurrence rule. - * (Though the iCalendar spec says that BYWEEKNO can only be used in a YEARLY - * rule, and some modifiers aren't appropriate for some frequencies - e.g. - * BYMONTHDAY is not really useful in a WEEKLY frequency, and BYYEARDAY is - * not useful in a MONTHLY or WEEKLY frequency). - * The frequency modifiers are applied in the order given above. The first 5 - * modifier rules (BYMONTH, BYWEEKNO, BYYEARDAY, BYMONTHDAY & BYDAY) all - * produce the days on which the occurrences take place, and so we have to - * compute some of these in parallel rather than sequentially, or we may end - * up with too many days. - * - * o Note that some expansion functions may produce days which are invalid, - * e.g. 31st September, 30th Feb. These invalid days are removed before the - * BYHOUR, BYMINUTE & BYSECOND modifier functions are applied. - * - * o After the set of occurrences for the frequency interval are generated, - * the BYSETPOS property is used to select which of the occurrences are - * finally output. If BYSETPOS is not specified then all the occurrences are - * output. - * - * - * FIXME: I think there are a few errors in this code: - * - * 1) I'm not sure it should be generating events in parallel like it says - * above. That needs to be checked. - * - * 2) I didn't think about timezone changes when implementing this. I just - * assumed all the occurrences of the event would be in local time. - * But when clocks go back or forwards due to daylight-saving time, some - * special handling may be needed, especially for the shorter frequencies. - * e.g. for a MINUTELY frequency it should probably iterate over all the - * minutes before and after clocks go back (i.e. some may be the same local - * time but have different UTC offsets). For longer frequencies, if an - * occurrence lands on the overlapping or non-existant time when clocks - * go back/forward, then it may need to choose which of the times to use - * or move the time forward or something. I'm not sure this is clear in the - * spec. - */ - -/* This is the maximum year we will go up to (inclusive). Since we use time_t - values we can't go past 2037 anyway, and some of our VTIMEZONEs may stop - at 2037 as well. */ -#define MAX_YEAR 2037 - -/* Define this for some debugging output. */ -#if 0 -#define CAL_OBJ_DEBUG 1 -#endif - -/* We will use icalrecurrencetype instead of this eventually. */ -typedef struct { - icalrecurrencetype_frequency freq; - - int interval; - - /* Specifies the end of the recurrence, inclusive. No occurrences are - generated after this date. If it is 0, the event recurs forever. */ - time_t enddate; - - /* WKST property - the week start day: 0 = Monday to 6 = Sunday. */ - gint week_start_day; - - - /* NOTE: I've used GList's here, but it doesn't matter if we use - other data structures like arrays. The code should be easy to - change. So long as it is easy to see if the modifier is set. */ - - /* For BYMONTH modifier. A list of GINT_TO_POINTERs, 0-11. */ - GList *bymonth; - - /* For BYWEEKNO modifier. A list of GINT_TO_POINTERs, [+-]1-53. */ - GList *byweekno; - - /* For BYYEARDAY modifier. A list of GINT_TO_POINTERs, [+-]1-366. */ - GList *byyearday; - - /* For BYMONTHDAY modifier. A list of GINT_TO_POINTERs, [+-]1-31. */ - GList *bymonthday; - - /* For BYDAY modifier. A list of GINT_TO_POINTERs, in pairs. - The first of each pair is the weekday, 0 = Monday to 6 = Sunday. - The second of each pair is the week number [+-]0-53. */ - GList *byday; - - /* For BYHOUR modifier. A list of GINT_TO_POINTERs, 0-23. */ - GList *byhour; - - /* For BYMINUTE modifier. A list of GINT_TO_POINTERs, 0-59. */ - GList *byminute; - - /* For BYSECOND modifier. A list of GINT_TO_POINTERs, 0-60. */ - GList *bysecond; - - /* For BYSETPOS modifier. A list of GINT_TO_POINTERs, +ve or -ve. */ - GList *bysetpos; -} CalRecurrence; - -/* This is what we use to pass to all the filter functions. */ -typedef struct _RecurData RecurData; -struct _RecurData { - CalRecurrence *recur; - - /* This is used for the WEEKLY frequency. It is the offset from the - week_start_day. */ - gint weekday_offset; - - /* This is used for fast lookup in BYMONTH filtering. */ - guint8 months[12]; - - /* This is used for fast lookup in BYYEARDAY filtering. */ - guint8 yeardays[367], neg_yeardays[367]; /* Days are 1 - 366. */ - - /* This is used for fast lookup in BYMONTHDAY filtering. */ - guint8 monthdays[32], neg_monthdays[32]; /* Days are 1 to 31. */ - - /* This is used for fast lookup in BYDAY filtering. */ - guint8 weekdays[7]; - - /* This is used for fast lookup in BYHOUR filtering. */ - guint8 hours[24]; - - /* This is used for fast lookup in BYMINUTE filtering. */ - guint8 minutes[60]; - - /* This is used for fast lookup in BYSECOND filtering. */ - guint8 seconds[62]; -}; - -/* This is what we use to represent a date & time. */ -typedef struct _CalObjTime CalObjTime; -struct _CalObjTime { - guint16 year; - guint8 month; /* 0 - 11 */ - guint8 day; /* 1 - 31 */ - guint8 hour; /* 0 - 23 */ - guint8 minute; /* 0 - 59 */ - guint8 second; /* 0 - 59 (maybe up to 61 for leap seconds) */ - guint8 flags; /* The meaning of this depends on where the - CalObjTime is used. In most cases this is - set to TRUE to indicate that this is an - RDATE with an end or a duration set. - In the exceptions code, this is set to TRUE - to indicate that this is an EXDATE with a - DATE value. */ -}; - -/* This is what we use to represent specific recurrence dates. - Note that we assume it starts with a CalObjTime when sorting. */ -typedef struct _CalObjRecurrenceDate CalObjRecurrenceDate; -struct _CalObjRecurrenceDate { - CalObjTime start; - CalComponentPeriod *period; -}; - -/* The paramter we use to store the enddate in RRULE and EXRULE properties. */ -#define EVOLUTION_END_DATE_PARAMETER "X-EVOLUTION-ENDDATE" - -typedef gboolean (*CalObjFindStartFn) (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime); -typedef gboolean (*CalObjFindNextFn) (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end); -typedef GArray* (*CalObjFilterFn) (RecurData *recur_data, - GArray *occs); - -typedef struct _CalRecurVTable CalRecurVTable; -struct _CalRecurVTable { - CalObjFindStartFn find_start_position; - CalObjFindNextFn find_next_position; - - CalObjFilterFn bymonth_filter; - CalObjFilterFn byweekno_filter; - CalObjFilterFn byyearday_filter; - CalObjFilterFn bymonthday_filter; - CalObjFilterFn byday_filter; - CalObjFilterFn byhour_filter; - CalObjFilterFn byminute_filter; - CalObjFilterFn bysecond_filter; -}; - - -/* This is used to specify which parts of the CalObjTime to compare in - cal_obj_time_compare(). */ -typedef enum { - CALOBJ_YEAR, - CALOBJ_MONTH, - CALOBJ_DAY, - CALOBJ_HOUR, - CALOBJ_MINUTE, - CALOBJ_SECOND -} CalObjTimeComparison; - -static void cal_recur_generate_instances_of_rule (CalComponent *comp, - icalproperty *prop, - time_t start, - time_t end, - CalRecurInstanceFn cb, - gpointer cb_data, - CalRecurResolveTimezoneFn tz_cb, - gpointer tz_cb_data, - icaltimezone *default_timezone); - -static CalRecurrence * cal_recur_from_icalproperty (icalproperty *prop, - gboolean exception, - icaltimezone *zone, - gboolean convert_end_date); -static gint cal_recur_ical_weekday_to_weekday (enum icalrecurrencetype_weekday day); -static void cal_recur_free (CalRecurrence *r); - - -static gboolean cal_object_get_rdate_end (CalObjTime *occ, - GArray *rdate_periods); -static void cal_object_compute_duration (CalObjTime *start, - CalObjTime *end, - gint *days, - gint *seconds); - -static gboolean generate_instances_for_chunk (CalComponent *comp, - time_t comp_dtstart, - icaltimezone *zone, - GSList *rrules, - GSList *rdates, - GSList *exrules, - GSList *exdates, - gboolean single_rule, - CalObjTime *event_start, - time_t interval_start, - CalObjTime *chunk_start, - CalObjTime *chunk_end, - gint duration_days, - gint duration_seconds, - gboolean convert_end_date, - CalRecurInstanceFn cb, - gpointer cb_data); - -static GArray* cal_obj_expand_recurrence (CalObjTime *event_start, - icaltimezone *zone, - CalRecurrence *recur, - CalObjTime *interval_start, - CalObjTime *interval_end, - gboolean *finished); - -static GArray* cal_obj_generate_set_yearly (RecurData *recur_data, - CalRecurVTable *vtable, - CalObjTime *occ); -static GArray* cal_obj_generate_set_monthly (RecurData *recur_data, - CalRecurVTable *vtable, - CalObjTime *occ); -static GArray* cal_obj_generate_set_default (RecurData *recur_data, - CalRecurVTable *vtable, - CalObjTime *occ); - - -static CalRecurVTable* cal_obj_get_vtable (icalrecurrencetype_frequency recur_type); -static void cal_obj_initialize_recur_data (RecurData *recur_data, - CalRecurrence *recur, - CalObjTime *event_start); -static void cal_obj_sort_occurrences (GArray *occs); -static gint cal_obj_time_compare_func (const void *arg1, - const void *arg2); -static void cal_obj_remove_duplicates_and_invalid_dates (GArray *occs); -static void cal_obj_remove_exceptions (GArray *occs, - GArray *ex_occs); -static GArray* cal_obj_bysetpos_filter (CalRecurrence *recur, - GArray *occs); - - -static gboolean cal_obj_yearly_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime); -static gboolean cal_obj_yearly_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end); - -static gboolean cal_obj_monthly_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime); -static gboolean cal_obj_monthly_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end); - -static gboolean cal_obj_weekly_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime); -static gboolean cal_obj_weekly_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end); - -static gboolean cal_obj_daily_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime); -static gboolean cal_obj_daily_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end); - -static gboolean cal_obj_hourly_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime); -static gboolean cal_obj_hourly_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end); - -static gboolean cal_obj_minutely_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime); -static gboolean cal_obj_minutely_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end); - -static gboolean cal_obj_secondly_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime); -static gboolean cal_obj_secondly_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end); - -static GArray* cal_obj_bymonth_expand (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_bymonth_filter (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_byweekno_expand (RecurData *recur_data, - GArray *occs); -#if 0 -/* This isn't used at present. */ -static GArray* cal_obj_byweekno_filter (RecurData *recur_data, - GArray *occs); -#endif -static GArray* cal_obj_byyearday_expand (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_byyearday_filter (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_bymonthday_expand (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_bymonthday_filter (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_byday_expand_yearly (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_byday_expand_monthly (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_byday_expand_weekly (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_byday_filter (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_byhour_expand (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_byhour_filter (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_byminute_expand (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_byminute_filter (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_bysecond_expand (RecurData *recur_data, - GArray *occs); -static GArray* cal_obj_bysecond_filter (RecurData *recur_data, - GArray *occs); - -static void cal_obj_time_add_months (CalObjTime *cotime, - gint months); -static void cal_obj_time_add_days (CalObjTime *cotime, - gint days); -static void cal_obj_time_add_hours (CalObjTime *cotime, - gint hours); -static void cal_obj_time_add_minutes (CalObjTime *cotime, - gint minutes); -static void cal_obj_time_add_seconds (CalObjTime *cotime, - gint seconds); -static gint cal_obj_time_compare (CalObjTime *cotime1, - CalObjTime *cotime2, - CalObjTimeComparison type); -static gint cal_obj_time_weekday (CalObjTime *cotime); -static gint cal_obj_time_weekday_offset (CalObjTime *cotime, - CalRecurrence *recur); -static gint cal_obj_time_day_of_year (CalObjTime *cotime); -static void cal_obj_time_find_first_week (CalObjTime *cotime, - RecurData *recur_data); -static void cal_object_time_from_time (CalObjTime *cotime, - time_t t, - icaltimezone *zone); -static gint cal_obj_date_only_compare_func (const void *arg1, - const void *arg2); - - - -static gboolean cal_recur_ensure_end_dates (CalComponent *comp, - gboolean refresh, - CalRecurResolveTimezoneFn tz_cb, - gpointer tz_cb_data); -static gboolean cal_recur_ensure_rule_end_date (CalComponent *comp, - icalproperty *prop, - gboolean exception, - gboolean refresh, - CalRecurResolveTimezoneFn tz_cb, - gpointer tz_cb_data); -static gboolean cal_recur_ensure_rule_end_date_cb (CalComponent *comp, - time_t instance_start, - time_t instance_end, - gpointer data); -static time_t cal_recur_get_rule_end_date (icalproperty *prop, - icaltimezone *default_timezone); -static void cal_recur_set_rule_end_date (icalproperty *prop, - time_t end_date); - - -#ifdef CAL_OBJ_DEBUG -static char* cal_obj_time_to_string (CalObjTime *cotime); -#endif - - -CalRecurVTable cal_obj_yearly_vtable = { - cal_obj_yearly_find_start_position, - cal_obj_yearly_find_next_position, - - cal_obj_bymonth_expand, - cal_obj_byweekno_expand, - cal_obj_byyearday_expand, - cal_obj_bymonthday_expand, - cal_obj_byday_expand_yearly, - cal_obj_byhour_expand, - cal_obj_byminute_expand, - cal_obj_bysecond_expand -}; - -CalRecurVTable cal_obj_monthly_vtable = { - cal_obj_monthly_find_start_position, - cal_obj_monthly_find_next_position, - - cal_obj_bymonth_filter, - NULL, /* BYWEEKNO is only applicable to YEARLY frequency. */ - NULL, /* BYYEARDAY is not useful in a MONTHLY frequency. */ - cal_obj_bymonthday_expand, - cal_obj_byday_expand_monthly, - cal_obj_byhour_expand, - cal_obj_byminute_expand, - cal_obj_bysecond_expand -}; - -CalRecurVTable cal_obj_weekly_vtable = { - cal_obj_weekly_find_start_position, - cal_obj_weekly_find_next_position, - - cal_obj_bymonth_filter, - NULL, /* BYWEEKNO is only applicable to YEARLY frequency. */ - NULL, /* BYYEARDAY is not useful in a WEEKLY frequency. */ - NULL, /* BYMONTHDAY is not useful in a WEEKLY frequency. */ - cal_obj_byday_expand_weekly, - cal_obj_byhour_expand, - cal_obj_byminute_expand, - cal_obj_bysecond_expand -}; - -CalRecurVTable cal_obj_daily_vtable = { - cal_obj_daily_find_start_position, - cal_obj_daily_find_next_position, - - cal_obj_bymonth_filter, - NULL, /* BYWEEKNO is only applicable to YEARLY frequency. */ - cal_obj_byyearday_filter, - cal_obj_bymonthday_filter, - cal_obj_byday_filter, - cal_obj_byhour_expand, - cal_obj_byminute_expand, - cal_obj_bysecond_expand -}; - -CalRecurVTable cal_obj_hourly_vtable = { - cal_obj_hourly_find_start_position, - cal_obj_hourly_find_next_position, - - cal_obj_bymonth_filter, - NULL, /* BYWEEKNO is only applicable to YEARLY frequency. */ - cal_obj_byyearday_filter, - cal_obj_bymonthday_filter, - cal_obj_byday_filter, - cal_obj_byhour_filter, - cal_obj_byminute_expand, - cal_obj_bysecond_expand -}; - -CalRecurVTable cal_obj_minutely_vtable = { - cal_obj_minutely_find_start_position, - cal_obj_minutely_find_next_position, - - cal_obj_bymonth_filter, - NULL, /* BYWEEKNO is only applicable to YEARLY frequency. */ - cal_obj_byyearday_filter, - cal_obj_bymonthday_filter, - cal_obj_byday_filter, - cal_obj_byhour_filter, - cal_obj_byminute_filter, - cal_obj_bysecond_expand -}; - -CalRecurVTable cal_obj_secondly_vtable = { - cal_obj_secondly_find_start_position, - cal_obj_secondly_find_next_position, - - cal_obj_bymonth_filter, - NULL, /* BYWEEKNO is only applicable to YEARLY frequency. */ - cal_obj_byyearday_filter, - cal_obj_bymonthday_filter, - cal_obj_byday_filter, - cal_obj_byhour_filter, - cal_obj_byminute_filter, - cal_obj_bysecond_filter -}; - -/* - * Calls the given callback function for each occurrence of the event that - * intersects the range between the given start and end times (the end time is - * not included). Note that the occurrences may start before the given start - * time. - * - * If the callback routine returns FALSE the occurrence generation stops. - * - * Both start and end can be -1, in which case we start at the events first - * instance and continue until it ends, or forever if it has no enddate. - */ -void -cal_recur_generate_instances (CalComponent *comp, - time_t start, - time_t end, - CalRecurInstanceFn cb, - gpointer cb_data, - CalRecurResolveTimezoneFn tz_cb, - gpointer tz_cb_data, - icaltimezone *default_timezone) -{ -#if 0 - g_print ("In cal_recur_generate_instances comp: %p\n", comp); - g_print (" start: %li - %s", start, ctime (&start)); - g_print (" end : %li - %s", end, ctime (&end)); -#endif - cal_recur_generate_instances_of_rule (comp, NULL, start, end, - cb, cb_data, tz_cb, tz_cb_data, - default_timezone); -} - - -/* - * Calls the given callback function for each occurrence of the given - * recurrence rule between the given start and end times. If the rule is NULL - * it uses all the rules from the component. - * - * If the callback routine returns FALSE the occurrence generation stops. - * - * The use of the specific rule is for determining the end of a rule when - * COUNT is set. The callback will count instances and store the enddate - * when COUNT is reached. - * - * Both start and end can be -1, in which case we start at the events first - * instance and continue until it ends, or forever if it has no enddate. - */ -static void -cal_recur_generate_instances_of_rule (CalComponent *comp, - icalproperty *prop, - time_t start, - time_t end, - CalRecurInstanceFn cb, - gpointer cb_data, - CalRecurResolveTimezoneFn tz_cb, - gpointer tz_cb_data, - icaltimezone *default_timezone) -{ - CalComponentDateTime dtstart, dtend; - time_t dtstart_time, dtend_time; - GSList *rrules = NULL, *rdates = NULL, elem; - GSList *exrules = NULL, *exdates = NULL; - CalObjTime interval_start, interval_end, event_start, event_end; - CalObjTime chunk_start, chunk_end; - gint days, seconds, year; - gboolean single_rule, convert_end_date = FALSE; - icaltimezone *start_zone = NULL, *end_zone = NULL; - - g_return_if_fail (comp != NULL); - g_return_if_fail (cb != NULL); - g_return_if_fail (tz_cb != NULL); - g_return_if_fail (start >= -1); - g_return_if_fail (end >= -1); - - /* Get dtstart, dtend, recurrences, and exceptions. Note that - cal_component_get_dtend() will convert a DURATION property to a - DTEND so we don't need to worry about that. */ - - cal_component_get_dtstart (comp, &dtstart); - cal_component_get_dtend (comp, &dtend); - - if (!dtstart.value) { - g_message ("cal_recur_generate_instances_of_rule(): bogus " - "component, does not have DTSTART. Skipping..."); - goto out; - } - - /* For DATE-TIME values with a TZID, we use the supplied callback to - resolve the TZID. For DATE values and DATE-TIME values without a - TZID (i.e. floating times) we use the default timezone. */ - if (dtstart.tzid && !dtstart.value->is_date) { - start_zone = (*tz_cb) (dtstart.tzid, tz_cb_data); - } else { - start_zone = default_timezone; - - /* Flag that we need to convert the saved ENDDATE property - to the default timezone. */ - convert_end_date = TRUE; - } - - dtstart_time = icaltime_as_timet_with_zone (*dtstart.value, - start_zone); - if (start == -1) - start = dtstart_time; - - if (dtend.value) { - /* If both DTSTART and DTEND are DATE values, and they are the - same day, we add 1 day to DTEND. This means that most - events created with the old Evolution behavior will still - work OK. I'm not sure what Outlook does in this case. */ - if (dtstart.value->is_date && dtend.value->is_date) { - if (icaltime_compare_date_only (*dtstart.value, - *dtend.value) == 0) { - icaltime_adjust (dtend.value, 1, 0, 0, 0); - } - } - } else { - /* If there is no DTEND, then if DTSTART is a DATE-TIME value - we use the same time (so we have a single point in time). - If DTSTART is a DATE value we add 1 day. */ - dtend.value = g_new (struct icaltimetype, 1); - *dtend.value = *dtstart.value; - - if (dtstart.value->is_date) { - icaltime_adjust (dtend.value, 1, 0, 0, 0); - } - } - - if (dtend.tzid && !dtend.value->is_date) { - end_zone = (*tz_cb) (dtend.tzid, tz_cb_data); - } else { - end_zone = default_timezone; - } - - /* We don't do this any more, since Outlook assumes that the DTEND - date is not included. */ -#if 0 - /* If DTEND is a DATE value, we add 1 day to it so that it includes - the entire day. */ - if (dtend.value->is_date) { - dtend.value->hour = 0; - dtend.value->minute = 0; - dtend.value->second = 0; - icaltime_adjust (dtend.value, 1, 0, 0, 0); - } -#endif - dtend_time = icaltime_as_timet_with_zone (*dtend.value, end_zone); - - /* If there is no recurrence, just call the callback if the event - intersects the given interval. */ - if (!(cal_component_has_recurrences (comp) - || cal_component_has_exceptions (comp))) { - if ((end == -1 || dtstart_time < end) && dtend_time > start) { - (* cb) (comp, dtstart_time, dtend_time, cb_data); - } - - goto out; - } - - /* If a specific recurrence rule is being used, set up a simple list, - else get the recurrence rules from the component. */ - if (prop) { - single_rule = TRUE; - - elem.data = prop; - elem.next = NULL; - rrules = &elem; - } else { - single_rule = FALSE; - - /* Make sure all the enddates for the rules are set. */ - cal_recur_ensure_end_dates (comp, FALSE, tz_cb, tz_cb_data); - - cal_component_get_rrule_property_list (comp, &rrules); - cal_component_get_rdate_list (comp, &rdates); - cal_component_get_exrule_property_list (comp, &exrules); - cal_component_get_exdate_list (comp, &exdates); - } - - /* Convert the interval start & end to CalObjTime. Note that if end - is -1 interval_end won't be set, so don't use it! - Also note that we use end - 1 since we want the interval to be - inclusive as it makes the code simpler. We do all calculation - in the timezone of the DTSTART. */ - cal_object_time_from_time (&interval_start, start, start_zone); - if (end != -1) - cal_object_time_from_time (&interval_end, end - 1, start_zone); - - cal_object_time_from_time (&event_start, dtstart_time, start_zone); - cal_object_time_from_time (&event_end, dtend_time, start_zone); - - /* Calculate the duration of the event, which we use for all - occurrences. We can't just subtract start from end since that may - be affected by daylight-saving time. So we want a value of days - + seconds. */ - cal_object_compute_duration (&event_start, &event_end, - &days, &seconds); - - /* Take off the duration from interval_start, so we get occurrences - that start just before the start time but overlap it. But only do - that if the interval is after the event's start time. */ - if (start > dtstart_time) { - cal_obj_time_add_days (&interval_start, -days); - cal_obj_time_add_seconds (&interval_start, -seconds); - } - - /* Expand the recurrence for each year between start & end, or until - the callback returns 0 if end is 0. We do a year at a time to - give the callback function a chance to break out of the loop, and - so we don't get into problems with infinite recurrences. Since we - have to work on complete sets of occurrences, if there is a yearly - frequency it wouldn't make sense to break it into smaller chunks, - since we would then be calculating the same sets several times. - Though this does mean that we sometimes do a lot more work than - is necessary, e.g. if COUNT is set to something quite low. */ - for (year = interval_start.year; - (end == -1 || year <= interval_end.year) && year <= MAX_YEAR; - year++) { - chunk_start = interval_start; - chunk_start.year = year; - if (end != -1) - chunk_end = interval_end; - chunk_end.year = year; - - if (year != interval_start.year) { - chunk_start.month = 0; - chunk_start.day = 1; - chunk_start.hour = 0; - chunk_start.minute = 0; - chunk_start.second = 0; - } - if (end == -1 || year != interval_end.year) { - chunk_end.month = 11; - chunk_end.day = 31; - chunk_end.hour = 23; - chunk_end.minute = 59; - chunk_end.second = 61; - chunk_end.flags = FALSE; - } - - if (!generate_instances_for_chunk (comp, dtstart_time, - start_zone, - rrules, rdates, - exrules, exdates, - single_rule, - &event_start, - start, - &chunk_start, &chunk_end, - days, seconds, - convert_end_date, - cb, cb_data)) - break; - } - - if (!prop) { - cal_component_free_period_list (rdates); - cal_component_free_exdate_list (exdates); - } - - out: - cal_component_free_datetime (&dtstart); - cal_component_free_datetime (&dtend); -} - -/* Builds a list of GINT_TO_POINTER() elements out of a short array from a - * struct icalrecurrencetype. - */ -static GList * -array_to_list (short *array, int max_elements) -{ - GList *l; - int i; - - l = NULL; - - for (i = 0; i < max_elements && array[i] != ICAL_RECURRENCE_ARRAY_MAX; i++) - l = g_list_prepend (l, GINT_TO_POINTER ((int) (array[i]))); - return g_list_reverse (l); -} - -/** - * cal_recur_from_icalproperty: - * @prop: An RRULE or EXRULE #icalproperty. - * @exception: TRUE if this is an EXRULE rather than an RRULE. - * @zone: The DTSTART timezone, used for converting the UNTIL property if it - * is given as a DATE value. - * @convert_end_date: TRUE if the saved end date needs to be converted to the - * given @zone timezone. This is needed if the DTSTART is a DATE or floating - * time. - * - * Converts an #icalproperty to a #CalRecurrence. This should be - * freed using the cal_recur_free() function. - * - * Return value: #CalRecurrence structure. - **/ -static CalRecurrence * -cal_recur_from_icalproperty (icalproperty *prop, gboolean exception, - icaltimezone *zone, gboolean convert_end_date) -{ - struct icalrecurrencetype ir; - CalRecurrence *r; - gint max_elements, i; - - g_return_val_if_fail (prop != NULL, NULL); - - r = g_new (CalRecurrence, 1); - - if (exception) - ir = icalproperty_get_exrule (prop); - else - ir = icalproperty_get_rrule (prop); - - r->freq = ir.freq; - r->interval = ir.interval; - - if (ir.count != 0) { - /* If COUNT is set, we use the pre-calculated enddate. - Note that this can be 0 if the RULE doesn't actually - generate COUNT instances. */ - r->enddate = cal_recur_get_rule_end_date (prop, convert_end_date ? zone : NULL); - } else { - if (icaltime_is_null_time (ir.until)) { - /* If neither COUNT or UNTIL is set, the event - recurs forever. */ - r->enddate = 0; - } else if (ir.until.is_date) { - /* If UNTIL is a DATE, we stop at the end of - the day, in local time (with the DTSTART timezone). - Note that UNTIL is inclusive so we stop before - midnight. */ - ir.until.hour = 23; - ir.until.minute = 59; - ir.until.second = 59; - ir.until.is_date = FALSE; - - r->enddate = icaltime_as_timet_with_zone (ir.until, - zone); -#if 0 - g_print (" until: %li - %s", r->enddate, ctime (&r->enddate)); -#endif - - } else { - /* If UNTIL is a DATE-TIME, it must be in UTC. */ - icaltimezone *utc_zone; - utc_zone = icaltimezone_get_utc_timezone (); - r->enddate = icaltime_as_timet_with_zone (ir.until, - utc_zone); - } - } - - r->week_start_day = cal_recur_ical_weekday_to_weekday (ir.week_start); - - r->bymonth = array_to_list (ir.by_month, - sizeof (ir.by_month) / sizeof (ir.by_month[0])); - - r->byweekno = array_to_list (ir.by_week_no, - sizeof (ir.by_week_no) / sizeof (ir.by_week_no[0])); - - r->byyearday = array_to_list (ir.by_year_day, - sizeof (ir.by_year_day) / sizeof (ir.by_year_day[0])); - - r->bymonthday = array_to_list (ir.by_month_day, - sizeof (ir.by_month_day) / sizeof (ir.by_month_day[0])); - - /* FIXME: libical only supports 8 values, out of possible 107 * 7. */ - r->byday = NULL; - max_elements = sizeof (ir.by_day) / sizeof (ir.by_day[0]); - for (i = 0; i < max_elements && ir.by_day[i] != ICAL_RECURRENCE_ARRAY_MAX; i++) { - enum icalrecurrencetype_weekday day; - gint weeknum, weekday; - - day = icalrecurrencetype_day_day_of_week (ir.by_day[i]); - weeknum = icalrecurrencetype_day_position (ir.by_day[i]); - - weekday = cal_recur_ical_weekday_to_weekday (day); - - r->byday = g_list_prepend (r->byday, - GINT_TO_POINTER (weeknum)); - r->byday = g_list_prepend (r->byday, - GINT_TO_POINTER (weekday)); - } - - r->byhour = array_to_list (ir.by_hour, - sizeof (ir.by_hour) / sizeof (ir.by_hour[0])); - - r->byminute = array_to_list (ir.by_minute, - sizeof (ir.by_minute) / sizeof (ir.by_minute[0])); - - r->bysecond = array_to_list (ir.by_second, - sizeof (ir.by_second) / sizeof (ir.by_second[0])); - - r->bysetpos = array_to_list (ir.by_set_pos, - sizeof (ir.by_set_pos) / sizeof (ir.by_set_pos[0])); - - return r; -} - - -static gint -cal_recur_ical_weekday_to_weekday (enum icalrecurrencetype_weekday day) -{ - gint weekday; - - switch (day) { - case ICAL_NO_WEEKDAY: /* Monday is the default in RFC2445. */ - case ICAL_MONDAY_WEEKDAY: - weekday = 0; - break; - case ICAL_TUESDAY_WEEKDAY: - weekday = 1; - break; - case ICAL_WEDNESDAY_WEEKDAY: - weekday = 2; - break; - case ICAL_THURSDAY_WEEKDAY: - weekday = 3; - break; - case ICAL_FRIDAY_WEEKDAY: - weekday = 4; - break; - case ICAL_SATURDAY_WEEKDAY: - weekday = 5; - break; - case ICAL_SUNDAY_WEEKDAY: - weekday = 6; - break; - default: - g_warning ("cal_recur_ical_weekday_to_weekday(): Unknown week day %d", - day); - weekday = 0; - } - - return weekday; -} - - -/** - * cal_recur_free: - * @r: A #CalRecurrence structure. - * - * Frees a #CalRecurrence structure. - **/ -static void -cal_recur_free (CalRecurrence *r) -{ - g_return_if_fail (r != NULL); - - g_list_free (r->bymonth); - g_list_free (r->byweekno); - g_list_free (r->byyearday); - g_list_free (r->bymonthday); - g_list_free (r->byday); - g_list_free (r->byhour); - g_list_free (r->byminute); - g_list_free (r->bysecond); - g_list_free (r->bysetpos); - - g_free (r); -} - -/* Generates one year's worth of recurrence instances. Returns TRUE if all the - * callback invocations returned TRUE, or FALSE when any one of them returns - * FALSE, i.e. meaning that the instance generation should be stopped. - * - * This should only output instances whose start time is between chunk_start - * and chunk_end (inclusive), or we may generate duplicates when we do the next - * chunk. (This applies mainly to weekly recurrences, since weeks can span 2 - * years.) - * - * It should also only output instances that are on or after the event's - * DTSTART property and that intersect the required interval, between - * interval_start and interval_end. - */ -static gboolean -generate_instances_for_chunk (CalComponent *comp, - time_t comp_dtstart, - icaltimezone *zone, - GSList *rrules, - GSList *rdates, - GSList *exrules, - GSList *exdates, - gboolean single_rule, - CalObjTime *event_start, - time_t interval_start, - CalObjTime *chunk_start, - CalObjTime *chunk_end, - gint duration_days, - gint duration_seconds, - gboolean convert_end_date, - CalRecurInstanceFn cb, - gpointer cb_data) -{ - GArray *occs, *ex_occs, *tmp_occs, *rdate_periods; - CalObjTime cotime, *occ; - GSList *elem; - gint i; - time_t start_time, end_time; - struct icaltimetype start_tt, end_tt; - gboolean cb_status = TRUE, rule_finished, finished = TRUE; - -#if 0 - g_print ("In generate_instances_for_chunk rrules: %p\n" - " %i/%i/%i %02i:%02i:%02i - %i/%i/%i %02i:%02i:%02i\n", - rrules, - chunk_start->day, chunk_start->month + 1, - chunk_start->year, chunk_start->hour, - chunk_start->minute, chunk_start->second, - chunk_end->day, chunk_end->month + 1, - chunk_end->year, chunk_end->hour, - chunk_end->minute, chunk_end->second); -#endif - - occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - ex_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - rdate_periods = g_array_new (FALSE, FALSE, - sizeof (CalObjRecurrenceDate)); - - /* The original DTSTART property is included in the occurrence set, - but not if we are just generating occurrences for a single rule. */ - if (!single_rule) { - /* We add it if it is in this chunk. If it is after this chunk - we set finished to FALSE, since we know we aren't finished - yet. */ - if (cal_obj_time_compare_func (event_start, chunk_end) >= 0) - finished = FALSE; - else if (cal_obj_time_compare_func (event_start, chunk_start) >= 0) - g_array_append_vals (occs, event_start, 1); - } - - /* Expand each of the recurrence rules. */ - for (elem = rrules; elem; elem = elem->next) { - icalproperty *prop; - CalRecurrence *r; - - prop = elem->data; - r = cal_recur_from_icalproperty (prop, FALSE, zone, - convert_end_date); - - tmp_occs = cal_obj_expand_recurrence (event_start, zone, r, - chunk_start, - chunk_end, - &rule_finished); - cal_recur_free (r); - - /* If any of the rules return FALSE for finished, we know we - have to carry on so we set finished to FALSE. */ - if (!rule_finished) - finished = FALSE; - - g_array_append_vals (occs, tmp_occs->data, tmp_occs->len); - g_array_free (tmp_occs, TRUE); - } - - /* Add on specific RDATE occurrence dates. If they have an end time - or duration set, flag them as RDATEs, and store a pointer to the - period in the rdate_periods array. Otherwise we can just treat them - as normal occurrences. */ - for (elem = rdates; elem; elem = elem->next) { - CalComponentPeriod *p; - CalObjRecurrenceDate rdate; - - p = elem->data; - - /* FIXME: We currently assume RDATEs are in the same timezone - as DTSTART. We should get the RDATE timezone and convert - to the DTSTART timezone first. */ - cotime.year = p->start.year; - cotime.month = p->start.month - 1; - cotime.day = p->start.day; - cotime.hour = p->start.hour; - cotime.minute = p->start.minute; - cotime.second = p->start.second; - cotime.flags = FALSE; - - /* If the rdate is after the current chunk we set finished - to FALSE, and we skip it. */ - if (cal_obj_time_compare_func (&cotime, chunk_end) >= 0) { - finished = FALSE; - continue; - } - - /* Check if the end date or duration is set. If it is we need - to store it so we can get it later. (libical seems to set - second to -1 to denote an unset time. See icalvalue.c) - FIXME. */ - if (p->type != CAL_COMPONENT_PERIOD_DATETIME - || p->u.end.second != -1) { - cotime.flags = TRUE; - - rdate.start = cotime; - rdate.period = p; - g_array_append_val (rdate_periods, rdate); - } - - g_array_append_val (occs, cotime); - } - - /* Expand each of the exception rules. */ - for (elem = exrules; elem; elem = elem->next) { - icalproperty *prop; - CalRecurrence *r; - - prop = elem->data; - r = cal_recur_from_icalproperty (prop, FALSE, zone, - convert_end_date); - - tmp_occs = cal_obj_expand_recurrence (event_start, zone, r, - chunk_start, - chunk_end, - &rule_finished); - cal_recur_free (r); - - g_array_append_vals (ex_occs, tmp_occs->data, tmp_occs->len); - g_array_free (tmp_occs, TRUE); - } - - /* Add on specific exception dates. */ - for (elem = exdates; elem; elem = elem->next) { - CalComponentDateTime *cdt; - - cdt = elem->data; - - /* FIXME: We currently assume EXDATEs are in the same timezone - as DTSTART. We should get the EXDATE timezone and convert - to the DTSTART timezone first. */ - cotime.year = cdt->value->year; - cotime.month = cdt->value->month - 1; - cotime.day = cdt->value->day; - - /* If the EXDATE has a DATE value, set the time to the start - of the day and set flags to TRUE so we know to skip all - occurrences on that date. */ - if (cdt->value->is_date) { - cotime.hour = 0; - cotime.minute = 0; - cotime.second = 0; - cotime.flags = TRUE; - } else { - cotime.hour = cdt->value->hour; - cotime.minute = cdt->value->minute; - cotime.second = cdt->value->second; - cotime.flags = FALSE; - } - - g_array_append_val (ex_occs, cotime); - } - - - /* Sort all the arrays. */ - cal_obj_sort_occurrences (occs); - cal_obj_sort_occurrences (ex_occs); - - qsort (rdate_periods->data, rdate_periods->len, - sizeof (CalObjRecurrenceDate), cal_obj_time_compare_func); - - /* Create the final array, by removing the exceptions from the - occurrences, and removing any duplicates. */ - cal_obj_remove_exceptions (occs, ex_occs); - - /* Call the callback for each occurrence. If it returns 0 we break - out of the loop. */ - for (i = 0; i < occs->len; i++) { - /* Convert each CalObjTime into a start & end time_t, and - check it is within the bounds of the event & interval. */ - occ = &g_array_index (occs, CalObjTime, i); -#if 0 - g_print ("Checking occurrence: %s\n", - cal_obj_time_to_string (occ)); -#endif - start_tt = icaltime_null_time (); - start_tt.year = occ->year; - start_tt.month = occ->month + 1; - start_tt.day = occ->day; - start_tt.hour = occ->hour; - start_tt.minute = occ->minute; - start_tt.second = occ->second; - start_time = icaltime_as_timet_with_zone (start_tt, zone); - - if (start_time == -1) { - g_warning ("time_t out of range"); - finished = TRUE; - break; - } - - /* Check to ensure that the start time is at or after the - event's DTSTART time, and that it is inside the chunk that - we are currently working on. (Note that the chunk_end time - is never after the interval end time, so this also tests - that we don't go past the end of the required interval). */ - if (start_time < comp_dtstart - || cal_obj_time_compare_func (occ, chunk_start) < 0 - || cal_obj_time_compare_func (occ, chunk_end) > 0) { -#if 0 - g_print (" start time invalid\n"); -#endif - continue; - } - - if (occ->flags) { - /* If it is an RDATE, we see if the end date or - duration was set. If not, we use the same duration - as the original occurrence. */ - if (!cal_object_get_rdate_end (occ, rdate_periods)) { - cal_obj_time_add_days (occ, duration_days); - cal_obj_time_add_seconds (occ, - duration_seconds); - } - } else { - cal_obj_time_add_days (occ, duration_days); - cal_obj_time_add_seconds (occ, duration_seconds); - } - - end_tt = icaltime_null_time (); - end_tt.year = occ->year; - end_tt.month = occ->month + 1; - end_tt.day = occ->day; - end_tt.hour = occ->hour; - end_tt.minute = occ->minute; - end_tt.second = occ->second; - end_time = icaltime_as_timet_with_zone (end_tt, zone); - - if (end_time == -1) { - g_warning ("time_t out of range"); - finished = TRUE; - break; - } - - /* Check that the end time is after the interval start, so we - know that it intersects the required interval. */ - if (end_time <= interval_start) { -#if 0 - g_print (" end time invalid\n"); -#endif - continue; - } - - cb_status = (*cb) (comp, start_time, end_time, cb_data); - if (!cb_status) - break; - } - - g_array_free (occs, TRUE); - g_array_free (ex_occs, TRUE); - g_array_free (rdate_periods, TRUE); - - /* We return TRUE (i.e. carry on) only if the callback has always - returned TRUE and we know that we have more occurrences to generate - (i.e. finished is FALSE). */ - return cb_status && !finished; -} - - -/* This looks up the occurrence time in the sorted rdate_periods array, and - tries to compute the end time of the occurrence. If no end time or duration - is set it returns FALSE and the default duration will be used. */ -static gboolean -cal_object_get_rdate_end (CalObjTime *occ, - GArray *rdate_periods) -{ - CalObjRecurrenceDate *rdate = NULL; - CalComponentPeriod *p; - gint lower, upper, middle, cmp = 0; - - lower = 0; - upper = rdate_periods->len; - - while (lower < upper) { - middle = (lower + upper) >> 1; - - rdate = &g_array_index (rdate_periods, CalObjRecurrenceDate, - middle); - - cmp = cal_obj_time_compare_func (occ, &rdate->start); - - if (cmp == 0) - break; - else if (cmp < 0) - upper = middle; - else - lower = middle + 1; - } - - /* This should never happen. */ - if (cmp == 0) { - g_warning ("Recurrence date not found"); - return FALSE; - } - - p = rdate->period; - if (p->type == CAL_COMPONENT_PERIOD_DATETIME) { - /* FIXME: We currently assume RDATEs are in the same timezone - as DTSTART. We should get the RDATE timezone and convert - to the DTSTART timezone first. */ - occ->year = p->u.end.year; - occ->month = p->u.end.month - 1; - occ->day = p->u.end.day; - occ->hour = p->u.end.hour; - occ->minute = p->u.end.minute; - occ->second = p->u.end.second; - occ->flags = FALSE; - } else { - cal_obj_time_add_days (occ, p->u.duration.weeks * 7 - + p->u.duration.days); - cal_obj_time_add_hours (occ, p->u.duration.hours); - cal_obj_time_add_minutes (occ, p->u.duration.minutes); - cal_obj_time_add_seconds (occ, p->u.duration.seconds); - } - - return TRUE; -} - - -static void -cal_object_compute_duration (CalObjTime *start, - CalObjTime *end, - gint *days, - gint *seconds) -{ - GDate start_date, end_date; - gint start_seconds, end_seconds; - - g_date_clear (&start_date, 1); - g_date_clear (&end_date, 1); - g_date_set_dmy (&start_date, start->day, start->month + 1, - start->year); - g_date_set_dmy (&end_date, end->day, end->month + 1, - end->year); - - *days = g_date_julian (&end_date) - g_date_julian (&start_date); - start_seconds = start->hour * 3600 + start->minute * 60 - + start->second; - end_seconds = end->hour * 3600 + end->minute * 60 + end->second; - - *seconds = end_seconds - start_seconds; - if (*seconds < 0) { - *days = *days - 1; - *seconds += 24 * 60 * 60; - } -} - - -/* Returns an unsorted GArray of CalObjTime's resulting from expanding the - given recurrence rule within the given interval. Note that it doesn't - clip the generated occurrences to the interval, i.e. if the interval - starts part way through the year this function still returns all the - occurrences for the year. Clipping is done later. - The finished flag is set to FALSE if there are more occurrences to generate - after the given interval.*/ -static GArray* -cal_obj_expand_recurrence (CalObjTime *event_start, - icaltimezone *zone, - CalRecurrence *recur, - CalObjTime *interval_start, - CalObjTime *interval_end, - gboolean *finished) -{ - CalRecurVTable *vtable; - CalObjTime *event_end = NULL, event_end_cotime; - RecurData recur_data; - CalObjTime occ, *cotime; - GArray *all_occs, *occs; - gint len; - - /* This is the resulting array of CalObjTime elements. */ - all_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - *finished = TRUE; - - vtable = cal_obj_get_vtable (recur->freq); - if (!vtable) - return all_occs; - - /* Calculate some useful data such as some fast lookup tables. */ - cal_obj_initialize_recur_data (&recur_data, recur, event_start); - - /* Compute the event_end, if the recur's enddate is set. */ - if (recur->enddate > 0) { - cal_object_time_from_time (&event_end_cotime, - recur->enddate, zone); - event_end = &event_end_cotime; - - /* If the enddate is before the requested interval return. */ - if (cal_obj_time_compare_func (event_end, interval_start) < 0) - return all_occs; - } - - /* Set finished to FALSE if we know there will be more occurrences to - do after this interval. */ - if (!interval_end || !event_end - || cal_obj_time_compare_func (event_end, interval_end) > 0) - *finished = FALSE; - - /* Get the first period based on the frequency and the interval that - intersects the interval between start and end. */ - if ((*vtable->find_start_position) (event_start, event_end, - &recur_data, - interval_start, interval_end, - &occ)) - return all_occs; - - /* Loop until the event ends or we go past the end of the required - interval. */ - for (;;) { - /* Generate the set of occurrences for this period. */ - switch (recur->freq) { - case ICAL_YEARLY_RECURRENCE: - occs = cal_obj_generate_set_yearly (&recur_data, - vtable, &occ); - break; - case ICAL_MONTHLY_RECURRENCE: - occs = cal_obj_generate_set_monthly (&recur_data, - vtable, &occ); - break; - default: - occs = cal_obj_generate_set_default (&recur_data, - vtable, &occ); - break; - } - - /* Sort the occurrences and remove duplicates. */ - cal_obj_sort_occurrences (occs); - cal_obj_remove_duplicates_and_invalid_dates (occs); - - /* Apply the BYSETPOS property. */ - occs = cal_obj_bysetpos_filter (recur, occs); - - /* Remove any occs after event_end. */ - len = occs->len - 1; - if (event_end) { - while (len >= 0) { - cotime = &g_array_index (occs, CalObjTime, - len); - if (cal_obj_time_compare_func (cotime, - event_end) <= 0) - break; - len--; - } - } - - /* Add the occurrences onto the main array. */ - if (len >= 0) - g_array_append_vals (all_occs, occs->data, len + 1); - - g_array_free (occs, TRUE); - - /* Skip to the next period, or exit the loop if finished. */ - if ((*vtable->find_next_position) (&occ, event_end, - &recur_data, interval_end)) - break; - } - - return all_occs; -} - - -static GArray* -cal_obj_generate_set_yearly (RecurData *recur_data, - CalRecurVTable *vtable, - CalObjTime *occ) -{ - CalRecurrence *recur = recur_data->recur; - GArray *occs_arrays[4], *occs, *occs2; - gint num_occs_arrays = 0, i; - - /* This is a bit complicated, since the iCalendar spec says that - several BYxxx modifiers can be used simultaneously. So we have to - be quite careful when determining the days of the occurrences. - The BYHOUR, BYMINUTE & BYSECOND modifiers are no problem at all. - - The modifiers we have to worry about are: BYMONTH, BYWEEKNO, - BYYEARDAY, BYMONTHDAY & BYDAY. We can't do these sequentially - since each filter will mess up the results of the previous one. - But they aren't all completely independant, e.g. BYMONTHDAY and - BYDAY are related to BYMONTH, and BYDAY is related to BYWEEKNO. - - BYDAY & BYMONTHDAY can also be applied independently, which makes - it worse. So we assume that if BYMONTH or BYWEEKNO is used, then - the BYDAY modifier applies to those, else it is applied - independantly. - - We expand the occurrences in parallel into the occs_arrays[] array, - and then merge them all into one GArray before expanding BYHOUR, - BYMINUTE & BYSECOND. */ - - if (recur->bymonth) { - occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - g_array_append_vals (occs, occ, 1); - - occs = (*vtable->bymonth_filter) (recur_data, occs); - - /* If BYMONTHDAY & BYDAY are both set we need to expand them - in parallel and add the results. */ - if (recur->bymonthday && recur->byday) { - /* Copy the occs array. */ - occs2 = g_array_new (FALSE, FALSE, - sizeof (CalObjTime)); - g_array_append_vals (occs2, occs->data, occs->len); - - occs = (*vtable->bymonthday_filter) (recur_data, occs); - /* Note that we explicitly call the monthly version - of the BYDAY expansion filter. */ - occs2 = cal_obj_byday_expand_monthly (recur_data, - occs2); - - /* Add the 2 resulting arrays together. */ - g_array_append_vals (occs, occs2->data, occs2->len); - g_array_free (occs2, TRUE); - } else { - occs = (*vtable->bymonthday_filter) (recur_data, occs); - /* Note that we explicitly call the monthly version - of the BYDAY expansion filter. */ - occs = cal_obj_byday_expand_monthly (recur_data, occs); - } - - occs_arrays[num_occs_arrays++] = occs; - } - - if (recur->byweekno) { - occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - g_array_append_vals (occs, occ, 1); - - occs = (*vtable->byweekno_filter) (recur_data, occs); - /* Note that we explicitly call the weekly version of the - BYDAY expansion filter. */ - occs = cal_obj_byday_expand_weekly (recur_data, occs); - - occs_arrays[num_occs_arrays++] = occs; - } - - if (recur->byyearday) { - occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - g_array_append_vals (occs, occ, 1); - - occs = (*vtable->byyearday_filter) (recur_data, occs); - - occs_arrays[num_occs_arrays++] = occs; - } - - /* If BYMONTHDAY is set, and BYMONTH is not set, we need to - expand BYMONTHDAY independantly. */ - if (recur->bymonthday && !recur->bymonth) { - occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - g_array_append_vals (occs, occ, 1); - - occs = (*vtable->bymonthday_filter) (recur_data, occs); - - occs_arrays[num_occs_arrays++] = occs; - } - - /* If BYDAY is set, and BYMONTH and BYWEEKNO are not set, we need to - expand BYDAY independantly. */ - if (recur->byday && !recur->bymonth && !recur->byweekno) { - occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - g_array_append_vals (occs, occ, 1); - - occs = (*vtable->byday_filter) (recur_data, occs); - - occs_arrays[num_occs_arrays++] = occs; - } - - /* Add all the arrays together. If no filters were used we just - create an array with one element. */ - if (num_occs_arrays > 0) { - occs = occs_arrays[0]; - for (i = 1; i < num_occs_arrays; i++) { - occs2 = occs_arrays[i]; - g_array_append_vals (occs, occs2->data, occs2->len); - g_array_free (occs2, TRUE); - } - } else { - occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - g_array_append_vals (occs, occ, 1); - } - - /* Now expand BYHOUR, BYMINUTE & BYSECOND. */ - occs = (*vtable->byhour_filter) (recur_data, occs); - occs = (*vtable->byminute_filter) (recur_data, occs); - occs = (*vtable->bysecond_filter) (recur_data, occs); - - return occs; -} - - -static GArray* -cal_obj_generate_set_monthly (RecurData *recur_data, - CalRecurVTable *vtable, - CalObjTime *occ) -{ - GArray *occs, *occs2; - - /* We start with just the one time in each set. */ - occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - g_array_append_vals (occs, occ, 1); - - occs = (*vtable->bymonth_filter) (recur_data, occs); - - /* We need to combine the output of BYMONTHDAY & BYDAY, by doing them - in parallel rather than sequentially. If we did them sequentially - then we would lose the occurrences generated by BYMONTHDAY, and - instead have repetitions of the occurrences from BYDAY. */ - if (recur_data->recur->bymonthday && recur_data->recur->byday) { - occs2 = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - g_array_append_vals (occs2, occs->data, occs->len); - - occs = (*vtable->bymonthday_filter) (recur_data, occs); - occs2 = (*vtable->byday_filter) (recur_data, occs2); - - g_array_append_vals (occs, occs2->data, occs2->len); - g_array_free (occs2, TRUE); - } else { - occs = (*vtable->bymonthday_filter) (recur_data, occs); - occs = (*vtable->byday_filter) (recur_data, occs); - } - - occs = (*vtable->byhour_filter) (recur_data, occs); - occs = (*vtable->byminute_filter) (recur_data, occs); - occs = (*vtable->bysecond_filter) (recur_data, occs); - - return occs; -} - - -static GArray* -cal_obj_generate_set_default (RecurData *recur_data, - CalRecurVTable *vtable, - CalObjTime *occ) -{ - GArray *occs; - -#if 0 - g_print ("Generating set for %i/%i/%i %02i:%02i:%02i\n", - occ->day, occ->month + 1, occ->year, occ->hour, occ->minute, - occ->second); -#endif - - /* We start with just the one time in the set. */ - occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - g_array_append_vals (occs, occ, 1); - - occs = (*vtable->bymonth_filter) (recur_data, occs); - if (vtable->byweekno_filter) - occs = (*vtable->byweekno_filter) (recur_data, occs); - if (vtable->byyearday_filter) - occs = (*vtable->byyearday_filter) (recur_data, occs); - if (vtable->bymonthday_filter) - occs = (*vtable->bymonthday_filter) (recur_data, occs); - occs = (*vtable->byday_filter) (recur_data, occs); - - occs = (*vtable->byhour_filter) (recur_data, occs); - occs = (*vtable->byminute_filter) (recur_data, occs); - occs = (*vtable->bysecond_filter) (recur_data, occs); - - return occs; -} - - - -/* Returns the function table corresponding to the recurrence frequency. */ -static CalRecurVTable* cal_obj_get_vtable (icalrecurrencetype_frequency recur_type) -{ - CalRecurVTable* vtable; - - switch (recur_type) { - case ICAL_YEARLY_RECURRENCE: - vtable = &cal_obj_yearly_vtable; - break; - case ICAL_MONTHLY_RECURRENCE: - vtable = &cal_obj_monthly_vtable; - break; - case ICAL_WEEKLY_RECURRENCE: - vtable = &cal_obj_weekly_vtable; - break; - case ICAL_DAILY_RECURRENCE: - vtable = &cal_obj_daily_vtable; - break; - case ICAL_HOURLY_RECURRENCE: - vtable = &cal_obj_hourly_vtable; - break; - case ICAL_MINUTELY_RECURRENCE: - vtable = &cal_obj_minutely_vtable; - break; - case ICAL_SECONDLY_RECURRENCE: - vtable = &cal_obj_secondly_vtable; - break; - default: - g_warning ("Unknown recurrence frequency"); - vtable = NULL; - } - - return vtable; -} - - -/* This creates a number of fast lookup tables used when filtering with the - modifier properties BYMONTH, BYYEARDAY etc. */ -static void -cal_obj_initialize_recur_data (RecurData *recur_data, - CalRecurrence *recur, - CalObjTime *event_start) -{ - GList *elem; - gint month, yearday, monthday, weekday, week_num, hour, minute, second; - - /* Clear the entire RecurData. */ - memset (recur_data, 0, sizeof (RecurData)); - - recur_data->recur = recur; - - /* Set the weekday, used for the WEEKLY frequency and the BYWEEKNO - modifier. */ - recur_data->weekday_offset = cal_obj_time_weekday_offset (event_start, - recur); - - /* Create an array of months from bymonths for fast lookup. */ - elem = recur->bymonth; - while (elem) { - month = GPOINTER_TO_INT (elem->data); - recur_data->months[month] = 1; - elem = elem->next; - } - - /* Create an array of yeardays from byyearday for fast lookup. - We create a second array to handle the negative values. The first - element there corresponds to the last day of the year. */ - elem = recur->byyearday; - while (elem) { - yearday = GPOINTER_TO_INT (elem->data); - if (yearday >= 0) - recur_data->yeardays[yearday] = 1; - else - recur_data->neg_yeardays[-yearday] = 1; - elem = elem->next; - } - - /* Create an array of monthdays from bymonthday for fast lookup. - We create a second array to handle the negative values. The first - element there corresponds to the last day of the month. */ - elem = recur->bymonthday; - while (elem) { - monthday = GPOINTER_TO_INT (elem->data); - if (monthday >= 0) - recur_data->monthdays[monthday] = 1; - else - recur_data->neg_monthdays[-monthday] = 1; - elem = elem->next; - } - - /* Create an array of weekdays from byday for fast lookup. */ - elem = recur->byday; - while (elem) { - weekday = GPOINTER_TO_INT (elem->data); - elem = elem->next; - /* The week number is not used when filtering. */ - week_num = GPOINTER_TO_INT (elem->data); - elem = elem->next; - - recur_data->weekdays[weekday] = 1; - } - - /* Create an array of hours from byhour for fast lookup. */ - elem = recur->byhour; - while (elem) { - hour = GPOINTER_TO_INT (elem->data); - recur_data->hours[hour] = 1; - elem = elem->next; - } - - /* Create an array of minutes from byminutes for fast lookup. */ - elem = recur->byminute; - while (elem) { - minute = GPOINTER_TO_INT (elem->data); - recur_data->minutes[minute] = 1; - elem = elem->next; - } - - /* Create an array of seconds from byseconds for fast lookup. */ - elem = recur->bysecond; - while (elem) { - second = GPOINTER_TO_INT (elem->data); - recur_data->seconds[second] = 1; - elem = elem->next; - } -} - - -static void -cal_obj_sort_occurrences (GArray *occs) -{ - qsort (occs->data, occs->len, sizeof (CalObjTime), - cal_obj_time_compare_func); -} - - -static void -cal_obj_remove_duplicates_and_invalid_dates (GArray *occs) -{ - static const int days_in_month[12] = { - 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 - }; - - CalObjTime *occ, *prev_occ = NULL; - gint len, i, j = 0, year, month, days; - gboolean keep_occ; - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - keep_occ = TRUE; - - if (prev_occ && cal_obj_time_compare_func (occ, - prev_occ) == 0) - keep_occ = FALSE; - - year = occ->year; - month = occ->month; - days = days_in_month[occ->month]; - /* If it is february and a leap year, add a day. */ - if (month == 1 && (year % 4 == 0 - && (year % 100 != 0 - || year % 400 == 0))) - days++; - if (occ->day > days) - keep_occ = FALSE; - - if (keep_occ) { - if (i != j) - g_array_index (occs, CalObjTime, j) - = g_array_index (occs, CalObjTime, i); - j++; - } - - prev_occ = occ; - } - - g_array_set_size (occs, j); -} - - -/* Removes the exceptions from the ex_occs array from the occurrences in the - occs array, and removes any duplicates. Both arrays are sorted. */ -static void -cal_obj_remove_exceptions (GArray *occs, - GArray *ex_occs) -{ - CalObjTime *occ, *prev_occ = NULL, *ex_occ = NULL, *last_occ_kept; - gint i, j = 0, cmp, ex_index, occs_len, ex_occs_len; - gboolean keep_occ, current_time_is_exception = FALSE; - - if (occs->len == 0) - return; - - ex_index = 0; - occs_len = occs->len; - ex_occs_len = ex_occs->len; - - if (ex_occs_len > 0) - ex_occ = &g_array_index (ex_occs, CalObjTime, ex_index); - - for (i = 0; i < occs_len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - keep_occ = TRUE; - - /* If the occurrence is a duplicate of the previous one, skip - it. */ - if (prev_occ - && cal_obj_time_compare_func (occ, prev_occ) == 0) { - keep_occ = FALSE; - - /* If this occurrence is an RDATE with an end or - duration set, and the previous occurrence in the - array was kept, set the RDATE flag of the last one, - so we still use the end date or duration. */ - if (occ->flags && !current_time_is_exception) { - last_occ_kept = &g_array_index (occs, - CalObjTime, - j - 1); - last_occ_kept->flags = TRUE; - } - } else { - /* We've found a new occurrence time. Reset the flag - to indicate that it hasn't been found in the - exceptions array (yet). */ - current_time_is_exception = FALSE; - - if (ex_occ) { - /* Step through the exceptions until we come - to one that matches or follows this - occurrence. */ - while (ex_occ) { - /* If the exception is an EXDATE with - a DATE value, we only have to - compare the date. */ - if (ex_occ->flags) - cmp = cal_obj_date_only_compare_func (ex_occ, occ); - else - cmp = cal_obj_time_compare_func (ex_occ, occ); - - if (cmp > 0) - break; - - /* Move to the next exception, or set - ex_occ to NULL when we reach the - end of array. */ - ex_index++; - if (ex_index < ex_occs_len) - ex_occ = &g_array_index (ex_occs, CalObjTime, ex_index); - else - ex_occ = NULL; - - /* If the exception did match this - occurrence we remove it, and set the - flag to indicate that the current - time is an exception. */ - if (cmp == 0) { - current_time_is_exception = TRUE; - keep_occ = FALSE; - break; - } - } - } - } - - if (keep_occ) { - /* We are keeping this occurrence, so we move it to - the next free space, unless its position hasn't - changed (i.e. all previous occurrences were also - kept). */ - if (i != j) - g_array_index (occs, CalObjTime, j) - = g_array_index (occs, CalObjTime, i); - j++; - } - - prev_occ = occ; - } - - g_array_set_size (occs, j); -} - - - -static GArray* -cal_obj_bysetpos_filter (CalRecurrence *recur, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - GList *elem; - gint len, pos; - - /* If BYSETPOS has not been specified, or the array is empty, just - return the array. */ - elem = recur->bysetpos; - if (!elem || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - /* Iterate over the indices given in bysetpos, adding the corresponding - element from occs to new_occs. */ - len = occs->len; - while (elem) { - pos = GPOINTER_TO_INT (elem->data); - - /* Negative values count back from the end of the array. */ - if (pos < 0) - pos += len; - /* Positive values need to be decremented since the array is - 0-based. */ - else - pos--; - - if (pos >= 0 && pos < len) { - occ = &g_array_index (occs, CalObjTime, pos); - g_array_append_vals (new_occs, occ, 1); - } - elem = elem->next; - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - - - -/* Finds the first year from the event_start, counting in multiples of the - recurrence interval, that intersects the given interval. It returns TRUE - if there is no intersection. */ -static gboolean -cal_obj_yearly_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime) -{ - *cotime = *event_start; - - /* Move on to the next interval, if the event starts before the - given interval. */ - if (cotime->year < interval_start->year) { - gint years = interval_start->year - cotime->year - + recur_data->recur->interval - 1; - years -= years % recur_data->recur->interval; - /* NOTE: The day may now be invalid, e.g. 29th Feb. */ - cotime->year += years; - } - - if ((event_end && cotime->year > event_end->year) - || (interval_end && cotime->year > interval_end->year)) - return TRUE; - - return FALSE; -} - - -static gboolean -cal_obj_yearly_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end) -{ - /* NOTE: The day may now be invalid, e.g. 29th Feb. */ - cotime->year += recur_data->recur->interval; - - if ((event_end && cotime->year > event_end->year) - || (interval_end && cotime->year > interval_end->year)) - return TRUE; - - return FALSE; -} - - - -static gboolean -cal_obj_monthly_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime) -{ - *cotime = *event_start; - - /* Move on to the next interval, if the event starts before the - given interval. */ - if (cal_obj_time_compare (cotime, interval_start, CALOBJ_MONTH) < 0) { - gint months = (interval_start->year - cotime->year) * 12 - + interval_start->month - cotime->month - + recur_data->recur->interval - 1; - months -= months % recur_data->recur->interval; - /* NOTE: The day may now be invalid, e.g. 31st Sep. */ - cal_obj_time_add_months (cotime, months); - } - - if (event_end && cal_obj_time_compare (cotime, event_end, - CALOBJ_MONTH) > 0) - return TRUE; - if (interval_end && cal_obj_time_compare (cotime, interval_end, - CALOBJ_MONTH) > 0) - return TRUE; - - return FALSE; -} - - -static gboolean -cal_obj_monthly_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end) -{ - /* NOTE: The day may now be invalid, e.g. 31st Sep. */ - cal_obj_time_add_months (cotime, recur_data->recur->interval); - - if (event_end && cal_obj_time_compare (cotime, event_end, - CALOBJ_MONTH) > 0) - return TRUE; - if (interval_end && cal_obj_time_compare (cotime, interval_end, - CALOBJ_MONTH) > 0) - return TRUE; - - return FALSE; -} - - - -static gboolean -cal_obj_weekly_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime) -{ - GDate event_start_date, interval_start_date; - guint32 event_start_julian, interval_start_julian; - gint interval_start_weekday_offset; - CalObjTime week_start; - - if (event_end && cal_obj_time_compare (event_end, interval_start, - CALOBJ_DAY) < 0) - return TRUE; - if (interval_end && cal_obj_time_compare (event_start, interval_end, - CALOBJ_DAY) > 0) - return TRUE; - - *cotime = *event_start; - - /* Convert the event start and interval start to GDates, so we can - easily find the number of days between them. */ - g_date_clear (&event_start_date, 1); - g_date_set_dmy (&event_start_date, event_start->day, - event_start->month + 1, event_start->year); - g_date_clear (&interval_start_date, 1); - g_date_set_dmy (&interval_start_date, interval_start->day, - interval_start->month + 1, interval_start->year); - - /* Calculate the start of the weeks corresponding to the event start - and interval start. */ - event_start_julian = g_date_julian (&event_start_date); - event_start_julian -= recur_data->weekday_offset; - - interval_start_julian = g_date_julian (&interval_start_date); - interval_start_weekday_offset = cal_obj_time_weekday_offset (interval_start, recur_data->recur); - interval_start_julian -= interval_start_weekday_offset; - - /* We want to find the first full week using the recurrence interval - that intersects the given interval dates. */ - if (event_start_julian < interval_start_julian) { - gint weeks = (interval_start_julian - event_start_julian) / 7; - weeks += recur_data->recur->interval - 1; - weeks -= weeks % recur_data->recur->interval; - cal_obj_time_add_days (cotime, weeks * 7); - } - - week_start = *cotime; - cal_obj_time_add_days (&week_start, -recur_data->weekday_offset); - - if (event_end && cal_obj_time_compare (&week_start, event_end, - CALOBJ_DAY) > 0) - return TRUE; - if (interval_end && cal_obj_time_compare (&week_start, interval_end, - CALOBJ_DAY) > 0) - return TRUE; - - return FALSE; -} - - -static gboolean -cal_obj_weekly_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end) -{ - CalObjTime week_start; - - cal_obj_time_add_days (cotime, recur_data->recur->interval * 7); - - /* Return TRUE if the start of this week is after the event finishes - or is after the end of the required interval. */ - week_start = *cotime; - cal_obj_time_add_days (&week_start, -recur_data->weekday_offset); - -#ifdef CAL_OBJ_DEBUG - g_print ("Next day: %s\n", cal_obj_time_to_string (cotime)); - g_print ("Week Start: %s\n", cal_obj_time_to_string (&week_start)); -#endif - - if (event_end && cal_obj_time_compare (&week_start, event_end, - CALOBJ_DAY) > 0) - return TRUE; - if (interval_end && cal_obj_time_compare (&week_start, interval_end, - CALOBJ_DAY) > 0) { -#ifdef CAL_OBJ_DEBUG - g_print ("Interval end reached: %s\n", - cal_obj_time_to_string (interval_end)); -#endif - return TRUE; - } - - return FALSE; -} - - -static gboolean -cal_obj_daily_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime) -{ - GDate event_start_date, interval_start_date; - guint32 event_start_julian, interval_start_julian, days; - - if (interval_end && cal_obj_time_compare (event_start, interval_end, - CALOBJ_DAY) > 0) - return TRUE; - if (event_end && cal_obj_time_compare (event_end, interval_start, - CALOBJ_DAY) < 0) - return TRUE; - - *cotime = *event_start; - - /* Convert the event start and interval start to GDates, so we can - easily find the number of days between them. */ - g_date_clear (&event_start_date, 1); - g_date_set_dmy (&event_start_date, event_start->day, - event_start->month + 1, event_start->year); - g_date_clear (&interval_start_date, 1); - g_date_set_dmy (&interval_start_date, interval_start->day, - interval_start->month + 1, interval_start->year); - - event_start_julian = g_date_julian (&event_start_date); - interval_start_julian = g_date_julian (&interval_start_date); - - if (event_start_julian < interval_start_julian) { - days = interval_start_julian - event_start_julian - + recur_data->recur->interval - 1; - days -= days % recur_data->recur->interval; - cal_obj_time_add_days (cotime, days); - } - - if (event_end && cal_obj_time_compare (cotime, event_end, - CALOBJ_DAY) > 0) - return TRUE; - if (interval_end && cal_obj_time_compare (cotime, interval_end, - CALOBJ_DAY) > 0) - return TRUE; - - return FALSE; -} - - -static gboolean -cal_obj_daily_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end) -{ - cal_obj_time_add_days (cotime, recur_data->recur->interval); - - if (event_end && cal_obj_time_compare (cotime, event_end, - CALOBJ_DAY) > 0) - return TRUE; - if (interval_end && cal_obj_time_compare (cotime, interval_end, - CALOBJ_DAY) > 0) - return TRUE; - - return FALSE; -} - - -static gboolean -cal_obj_hourly_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime) -{ - GDate event_start_date, interval_start_date; - guint32 event_start_julian, interval_start_julian, hours; - - if (interval_end && cal_obj_time_compare (event_start, interval_end, - CALOBJ_HOUR) > 0) - return TRUE; - if (event_end && cal_obj_time_compare (event_end, interval_start, - CALOBJ_HOUR) < 0) - return TRUE; - - *cotime = *event_start; - - if (cal_obj_time_compare (event_start, interval_start, - CALOBJ_HOUR) < 0) { - /* Convert the event start and interval start to GDates, so we - can easily find the number of days between them. */ - g_date_clear (&event_start_date, 1); - g_date_set_dmy (&event_start_date, event_start->day, - event_start->month + 1, event_start->year); - g_date_clear (&interval_start_date, 1); - g_date_set_dmy (&interval_start_date, interval_start->day, - interval_start->month + 1, - interval_start->year); - - event_start_julian = g_date_julian (&event_start_date); - interval_start_julian = g_date_julian (&interval_start_date); - - hours = (interval_start_julian - event_start_julian) * 24; - hours += interval_start->hour - event_start->hour; - hours += recur_data->recur->interval - 1; - hours -= hours % recur_data->recur->interval; - cal_obj_time_add_hours (cotime, hours); - } - - if (event_end && cal_obj_time_compare (cotime, event_end, - CALOBJ_HOUR) > 0) - return TRUE; - if (interval_end && cal_obj_time_compare (cotime, interval_end, - CALOBJ_HOUR) > 0) - return TRUE; - - return FALSE; -} - - -static gboolean -cal_obj_hourly_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end) -{ - cal_obj_time_add_hours (cotime, recur_data->recur->interval); - - if (event_end && cal_obj_time_compare (cotime, event_end, - CALOBJ_HOUR) > 0) - return TRUE; - if (interval_end && cal_obj_time_compare (cotime, interval_end, - CALOBJ_HOUR) > 0) - return TRUE; - - return FALSE; -} - - -static gboolean -cal_obj_minutely_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime) -{ - GDate event_start_date, interval_start_date; - guint32 event_start_julian, interval_start_julian, minutes; - - if (interval_end && cal_obj_time_compare (event_start, interval_end, - CALOBJ_MINUTE) > 0) - return TRUE; - if (event_end && cal_obj_time_compare (event_end, interval_start, - CALOBJ_MINUTE) < 0) - return TRUE; - - *cotime = *event_start; - - if (cal_obj_time_compare (event_start, interval_start, - CALOBJ_MINUTE) < 0) { - /* Convert the event start and interval start to GDates, so we - can easily find the number of days between them. */ - g_date_clear (&event_start_date, 1); - g_date_set_dmy (&event_start_date, event_start->day, - event_start->month + 1, event_start->year); - g_date_clear (&interval_start_date, 1); - g_date_set_dmy (&interval_start_date, interval_start->day, - interval_start->month + 1, - interval_start->year); - - event_start_julian = g_date_julian (&event_start_date); - interval_start_julian = g_date_julian (&interval_start_date); - - minutes = (interval_start_julian - event_start_julian) - * 24 * 60; - minutes += (interval_start->hour - event_start->hour) * 24; - minutes += interval_start->minute - event_start->minute; - minutes += recur_data->recur->interval - 1; - minutes -= minutes % recur_data->recur->interval; - cal_obj_time_add_minutes (cotime, minutes); - } - - if (event_end && cal_obj_time_compare (cotime, event_end, - CALOBJ_MINUTE) > 0) - return TRUE; - if (interval_end && cal_obj_time_compare (cotime, interval_end, - CALOBJ_MINUTE) > 0) - return TRUE; - - return FALSE; -} - - -static gboolean -cal_obj_minutely_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end) -{ - cal_obj_time_add_minutes (cotime, recur_data->recur->interval); - - if (event_end && cal_obj_time_compare (cotime, event_end, - CALOBJ_MINUTE) > 0) - return TRUE; - if (interval_end && cal_obj_time_compare (cotime, interval_end, - CALOBJ_MINUTE) > 0) - return TRUE; - - return FALSE; -} - - -static gboolean -cal_obj_secondly_find_start_position (CalObjTime *event_start, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_start, - CalObjTime *interval_end, - CalObjTime *cotime) -{ - GDate event_start_date, interval_start_date; - guint32 event_start_julian, interval_start_julian, seconds; - - if (interval_end && cal_obj_time_compare (event_start, interval_end, - CALOBJ_SECOND) > 0) - return TRUE; - if (event_end && cal_obj_time_compare (event_end, interval_start, - CALOBJ_SECOND) < 0) - return TRUE; - - *cotime = *event_start; - - if (cal_obj_time_compare (event_start, interval_start, - CALOBJ_SECOND) < 0) { - /* Convert the event start and interval start to GDates, so we - can easily find the number of days between them. */ - g_date_clear (&event_start_date, 1); - g_date_set_dmy (&event_start_date, event_start->day, - event_start->month + 1, event_start->year); - g_date_clear (&interval_start_date, 1); - g_date_set_dmy (&interval_start_date, interval_start->day, - interval_start->month + 1, - interval_start->year); - - event_start_julian = g_date_julian (&event_start_date); - interval_start_julian = g_date_julian (&interval_start_date); - - seconds = (interval_start_julian - event_start_julian) - * 24 * 60 * 60; - seconds += (interval_start->hour - event_start->hour) - * 24 * 60; - seconds += (interval_start->minute - event_start->minute) * 60; - seconds += interval_start->second - event_start->second; - seconds += recur_data->recur->interval - 1; - seconds -= seconds % recur_data->recur->interval; - cal_obj_time_add_seconds (cotime, seconds); - } - - if (event_end && cal_obj_time_compare (cotime, event_end, - CALOBJ_SECOND) >= 0) - return TRUE; - if (interval_end && cal_obj_time_compare (cotime, interval_end, - CALOBJ_SECOND) >= 0) - return TRUE; - - return FALSE; -} - - -static gboolean -cal_obj_secondly_find_next_position (CalObjTime *cotime, - CalObjTime *event_end, - RecurData *recur_data, - CalObjTime *interval_end) -{ - cal_obj_time_add_seconds (cotime, recur_data->recur->interval); - - if (event_end && cal_obj_time_compare (cotime, event_end, - CALOBJ_SECOND) >= 0) - return TRUE; - if (interval_end && cal_obj_time_compare (cotime, interval_end, - CALOBJ_SECOND) >= 0) - return TRUE; - - return FALSE; -} - - - - - -/* If the BYMONTH rule is specified it expands each occurrence in occs, by - using each of the months in the bymonth list. */ -static GArray* -cal_obj_bymonth_expand (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - GList *elem; - gint len, i; - - /* If BYMONTH has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->bymonth || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - - elem = recur_data->recur->bymonth; - while (elem) { - /* NOTE: The day may now be invalid, e.g. 31st Feb. */ - occ->month = GPOINTER_TO_INT (elem->data); - g_array_append_vals (new_occs, occ, 1); - elem = elem->next; - } - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - -/* If the BYMONTH rule is specified it filters out all occurrences in occs - which do not match one of the months in the bymonth list. */ -static GArray* -cal_obj_bymonth_filter (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - gint len, i; - - /* If BYMONTH has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->bymonth || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - if (recur_data->months[occ->month]) - g_array_append_vals (new_occs, occ, 1); - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - - -static GArray* -cal_obj_byweekno_expand (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ, year_start_cotime, year_end_cotime, cotime; - GList *elem; - gint len, i, weekno; - - /* If BYWEEKNO has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->byweekno || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - - /* Find the day that would correspond to week 1 (note that - week 1 is the first week starting from the specified week - start day that has 4 days in the new year). */ - year_start_cotime = *occ; - cal_obj_time_find_first_week (&year_start_cotime, - recur_data); - - /* Find the day that would correspond to week 1 of the next - year, which we use for -ve week numbers. */ - year_end_cotime = *occ; - year_end_cotime.year++; - cal_obj_time_find_first_week (&year_end_cotime, - recur_data); - - /* Now iterate over the week numbers in byweekno, generating a - new occurrence for each one. */ - elem = recur_data->recur->byweekno; - while (elem) { - weekno = GPOINTER_TO_INT (elem->data); - if (weekno > 0) { - cotime = year_start_cotime; - cal_obj_time_add_days (&cotime, - (weekno - 1) * 7); - } else { - cotime = year_end_cotime; - cal_obj_time_add_days (&cotime, weekno * 7); - } - - /* Skip occurrences if they fall outside the year. */ - if (cotime.year == occ->year) - g_array_append_val (new_occs, cotime); - elem = elem->next; - } - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - -#if 0 -/* This isn't used at present. */ -static GArray* -cal_obj_byweekno_filter (RecurData *recur_data, - GArray *occs) -{ - - return occs; -} -#endif - - -static GArray* -cal_obj_byyearday_expand (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ, year_start_cotime, year_end_cotime, cotime; - GList *elem; - gint len, i, dayno; - - /* If BYYEARDAY has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->byyearday || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - - /* Find the day that would correspond to day 1. */ - year_start_cotime = *occ; - year_start_cotime.month = 0; - year_start_cotime.day = 1; - - /* Find the day that would correspond to day 1 of the next - year, which we use for -ve day numbers. */ - year_end_cotime = *occ; - year_end_cotime.year++; - year_end_cotime.month = 0; - year_end_cotime.day = 1; - - /* Now iterate over the day numbers in byyearday, generating a - new occurrence for each one. */ - elem = recur_data->recur->byyearday; - while (elem) { - dayno = GPOINTER_TO_INT (elem->data); - if (dayno > 0) { - cotime = year_start_cotime; - cal_obj_time_add_days (&cotime, dayno - 1); - } else { - cotime = year_end_cotime; - cal_obj_time_add_days (&cotime, dayno); - } - - /* Skip occurrences if they fall outside the year. */ - if (cotime.year == occ->year) - g_array_append_val (new_occs, cotime); - elem = elem->next; - } - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - -/* Note: occs must not contain invalid dates, e.g. 31st September. */ -static GArray* -cal_obj_byyearday_filter (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - gint yearday, len, i, days_in_year; - - /* If BYYEARDAY has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->byyearday || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - yearday = cal_obj_time_day_of_year (occ); - if (recur_data->yeardays[yearday]) { - g_array_append_vals (new_occs, occ, 1); - } else { - days_in_year = g_date_is_leap_year (occ->year) - ? 366 : 365; - if (recur_data->neg_yeardays[days_in_year + 1 - - yearday]) - g_array_append_vals (new_occs, occ, 1); - } - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - - -static GArray* -cal_obj_bymonthday_expand (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ, month_start_cotime, month_end_cotime, cotime; - GList *elem; - gint len, i, dayno; - - /* If BYMONTHDAY has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->bymonthday || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - - /* Find the day that would correspond to day 1. */ - month_start_cotime = *occ; - month_start_cotime.day = 1; - - /* Find the day that would correspond to day 1 of the next - month, which we use for -ve day numbers. */ - month_end_cotime = *occ; - month_end_cotime.month++; - month_end_cotime.day = 1; - - /* Now iterate over the day numbers in bymonthday, generating a - new occurrence for each one. */ - elem = recur_data->recur->bymonthday; - while (elem) { - dayno = GPOINTER_TO_INT (elem->data); - if (dayno > 0) { - cotime = month_start_cotime; - cal_obj_time_add_days (&cotime, dayno - 1); - } else { - cotime = month_end_cotime; - cal_obj_time_add_days (&cotime, dayno); - } - - /* Skip occurrences if they fall outside the month. */ - if (cotime.month == occ->month) - g_array_append_val (new_occs, cotime); - elem = elem->next; - } - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - -static GArray* -cal_obj_bymonthday_filter (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - gint len, i, days_in_month; - - /* If BYMONTHDAY has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->bymonthday || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - if (recur_data->monthdays[occ->day]) { - g_array_append_vals (new_occs, occ, 1); - } else { - days_in_month = time_days_in_month (occ->year, - occ->month); - if (recur_data->neg_monthdays[days_in_month + 1 - - occ->day]) - g_array_append_vals (new_occs, occ, 1); - } - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - - -static GArray* -cal_obj_byday_expand_yearly (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - GList *elem; - gint len, i, weekday, week_num; - gint first_weekday, last_weekday, offset; - guint16 year; - - /* If BYDAY has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->byday || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - - elem = recur_data->recur->byday; - while (elem) { - weekday = GPOINTER_TO_INT (elem->data); - elem = elem->next; - week_num = GPOINTER_TO_INT (elem->data); - elem = elem->next; - - year = occ->year; - if (week_num == 0) { - /* Expand to every Mon/Tue/etc. in the year. */ - occ->month = 0; - occ->day = 1; - first_weekday = cal_obj_time_weekday (occ); - offset = (weekday + 7 - first_weekday) % 7; - cal_obj_time_add_days (occ, offset); - - while (occ->year == year) { - g_array_append_vals (new_occs, occ, 1); - cal_obj_time_add_days (occ, 7); - } - - } else if (week_num > 0) { - /* Add the nth Mon/Tue/etc. in the year. */ - occ->month = 0; - occ->day = 1; - first_weekday = cal_obj_time_weekday (occ); - offset = (weekday + 7 - first_weekday) % 7; - offset += (week_num - 1) * 7; - cal_obj_time_add_days (occ, offset); - if (occ->year == year) - g_array_append_vals (new_occs, occ, 1); - - } else { - /* Add the -nth Mon/Tue/etc. in the year. */ - occ->month = 11; - occ->day = 31; - last_weekday = cal_obj_time_weekday (occ); - offset = (last_weekday + 7 - weekday) % 7; - offset += (week_num - 1) * 7; - cal_obj_time_add_days (occ, -offset); - if (occ->year == year) - g_array_append_vals (new_occs, occ, 1); - } - - /* Reset the year, as we may have gone past the end. */ - occ->year = year; - } - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - -static GArray* -cal_obj_byday_expand_monthly (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - GList *elem; - gint len, i, weekday, week_num; - gint first_weekday, last_weekday, offset; - guint16 year; - guint8 month; - - /* If BYDAY has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->byday || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - - elem = recur_data->recur->byday; - while (elem) { - weekday = GPOINTER_TO_INT (elem->data); - elem = elem->next; - week_num = GPOINTER_TO_INT (elem->data); - elem = elem->next; - - year = occ->year; - month = occ->month; - if (week_num == 0) { - /* Expand to every Mon/Tue/etc. in the month.*/ - occ->day = 1; - first_weekday = cal_obj_time_weekday (occ); - offset = (weekday + 7 - first_weekday) % 7; - cal_obj_time_add_days (occ, offset); - - while (occ->year == year - && occ->month == month) { - g_array_append_vals (new_occs, occ, 1); - cal_obj_time_add_days (occ, 7); - } - - } else if (week_num > 0) { - /* Add the nth Mon/Tue/etc. in the month. */ - occ->day = 1; - first_weekday = cal_obj_time_weekday (occ); - offset = (weekday + 7 - first_weekday) % 7; - offset += (week_num - 1) * 7; - cal_obj_time_add_days (occ, offset); - if (occ->year == year && occ->month == month) - g_array_append_vals (new_occs, occ, 1); - - } else { - /* Add the -nth Mon/Tue/etc. in the month. */ - occ->day = time_days_in_month (occ->year, - occ->month); - last_weekday = cal_obj_time_weekday (occ); - - /* This calculates the number of days to step - backwards from the last day of the month - to the weekday we want. */ - offset = (last_weekday + 7 - weekday) % 7; - - /* This adds on the weeks. */ - offset += (-week_num - 1) * 7; - - cal_obj_time_add_days (occ, -offset); - if (occ->year == year && occ->month == month) - g_array_append_vals (new_occs, occ, 1); - } - - /* Reset the year & month, as we may have gone past - the end. */ - occ->year = year; - occ->month = month; - } - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - -/* Note: occs must not contain invalid dates, e.g. 31st September. */ -static GArray* -cal_obj_byday_expand_weekly (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - GList *elem; - gint len, i, weekday, week_num; - gint weekday_offset, new_weekday_offset; - - /* If BYDAY has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->byday || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - - elem = recur_data->recur->byday; - while (elem) { - weekday = GPOINTER_TO_INT (elem->data); - elem = elem->next; - - /* FIXME: Currently we just ignore this, but maybe we - should skip all elements where week_num != 0. - The spec isn't clear about this. */ - week_num = GPOINTER_TO_INT (elem->data); - elem = elem->next; - - weekday_offset = cal_obj_time_weekday_offset (occ, recur_data->recur); - new_weekday_offset = (weekday + 7 - recur_data->recur->week_start_day) % 7; - cal_obj_time_add_days (occ, new_weekday_offset - weekday_offset); - g_array_append_vals (new_occs, occ, 1); - } - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - -/* Note: occs must not contain invalid dates, e.g. 31st September. */ -static GArray* -cal_obj_byday_filter (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - gint len, i, weekday; - - /* If BYDAY has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->byday || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - weekday = cal_obj_time_weekday (occ); - - /* See if the weekday on its own is set. */ - if (recur_data->weekdays[weekday]) - g_array_append_vals (new_occs, occ, 1); - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - - -/* If the BYHOUR rule is specified it expands each occurrence in occs, by - using each of the hours in the byhour list. */ -static GArray* -cal_obj_byhour_expand (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - GList *elem; - gint len, i; - - /* If BYHOUR has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->byhour || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - - elem = recur_data->recur->byhour; - while (elem) { - occ->hour = GPOINTER_TO_INT (elem->data); - g_array_append_vals (new_occs, occ, 1); - elem = elem->next; - } - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - -/* If the BYHOUR rule is specified it filters out all occurrences in occs - which do not match one of the hours in the byhour list. */ -static GArray* -cal_obj_byhour_filter (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - gint len, i; - - /* If BYHOUR has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->byhour || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - if (recur_data->hours[occ->hour]) - g_array_append_vals (new_occs, occ, 1); - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - - -/* If the BYMINUTE rule is specified it expands each occurrence in occs, by - using each of the minutes in the byminute list. */ -static GArray* -cal_obj_byminute_expand (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - GList *elem; - gint len, i; - - /* If BYMINUTE has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->byminute || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - - elem = recur_data->recur->byminute; - while (elem) { - occ->minute = GPOINTER_TO_INT (elem->data); - g_array_append_vals (new_occs, occ, 1); - elem = elem->next; - } - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - -/* If the BYMINUTE rule is specified it filters out all occurrences in occs - which do not match one of the minutes in the byminute list. */ -static GArray* -cal_obj_byminute_filter (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - gint len, i; - - /* If BYMINUTE has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->byminute || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - if (recur_data->minutes[occ->minute]) - g_array_append_vals (new_occs, occ, 1); - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - - -/* If the BYSECOND rule is specified it expands each occurrence in occs, by - using each of the seconds in the bysecond list. */ -static GArray* -cal_obj_bysecond_expand (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - GList *elem; - gint len, i; - - /* If BYSECOND has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->bysecond || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - - elem = recur_data->recur->bysecond; - while (elem) { - occ->second = GPOINTER_TO_INT (elem->data); - g_array_append_vals (new_occs, occ, 1); - elem = elem->next; - } - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - -/* If the BYSECOND rule is specified it filters out all occurrences in occs - which do not match one of the seconds in the bysecond list. */ -static GArray* -cal_obj_bysecond_filter (RecurData *recur_data, - GArray *occs) -{ - GArray *new_occs; - CalObjTime *occ; - gint len, i; - - /* If BYSECOND has not been specified, or the array is empty, just - return the array. */ - if (!recur_data->recur->bysecond || occs->len == 0) - return occs; - - new_occs = g_array_new (FALSE, FALSE, sizeof (CalObjTime)); - - len = occs->len; - for (i = 0; i < len; i++) { - occ = &g_array_index (occs, CalObjTime, i); - if (recur_data->seconds[occ->second]) - g_array_append_vals (new_occs, occ, 1); - } - - g_array_free (occs, TRUE); - - return new_occs; -} - - - - - -/* Adds a positive or negative number of months to the given CalObjTime, - updating the year appropriately so we end up with a valid month. - Note that the day may be invalid, e.g. 30th Feb. */ -static void -cal_obj_time_add_months (CalObjTime *cotime, - gint months) -{ - guint month, years; - - /* We use a guint to avoid overflow on the guint8. */ - month = cotime->month + months; - cotime->month = month % 12; - if (month > 0) { - cotime->year += month / 12; - } else { - years = month / 12; - if (cotime->month != 0) { - cotime->month += 12; - years -= 1; - } - cotime->year += years; - } -} - - -/* Adds a positive or negative number of days to the given CalObjTime, - updating the month and year appropriately so we end up with a valid day. */ -static void -cal_obj_time_add_days (CalObjTime *cotime, - gint days) -{ - gint day, days_in_month; - - /* We use a guint to avoid overflow on the guint8. */ - day = cotime->day; - day += days; - - if (days >= 0) { - for (;;) { - days_in_month = time_days_in_month (cotime->year, - cotime->month); - if (day <= days_in_month) - break; - - cotime->month++; - if (cotime->month >= 12) { - cotime->year++; - cotime->month = 0; - } - - day -= days_in_month; - } - - cotime->day = (guint8) day; - } else { - while (day <= 0) { - if (cotime->month == 0) { - cotime->year--; - cotime->month = 11; - } else { - cotime->month--; - } - - days_in_month = time_days_in_month (cotime->year, - cotime->month); - day += days_in_month; - } - - cotime->day = (guint8) day; - } -} - - -/* Adds a positive or negative number of hours to the given CalObjTime, - updating the day, month & year appropriately so we end up with a valid - time. */ -static void -cal_obj_time_add_hours (CalObjTime *cotime, - gint hours) -{ - gint hour, days; - - /* We use a gint to avoid overflow on the guint8. */ - hour = cotime->hour + hours; - cotime->hour = hour % 24; - if (hour >= 0) { - if (hour >= 24) - cal_obj_time_add_days (cotime, hour / 24); - } else { - days = hour / 24; - if (cotime->hour != 0) { - cotime->hour += 24; - days -= 1; - } - cal_obj_time_add_days (cotime, days); - } -} - - -/* Adds a positive or negative number of minutes to the given CalObjTime, - updating the rest of the CalObjTime appropriately. */ -static void -cal_obj_time_add_minutes (CalObjTime *cotime, - gint minutes) -{ - gint minute, hours; - - /* We use a gint to avoid overflow on the guint8. */ - minute = cotime->minute + minutes; - cotime->minute = minute % 60; - if (minute >= 0) { - if (minute >= 60) - cal_obj_time_add_hours (cotime, minute / 60); - } else { - hours = minute / 60; - if (cotime->minute != 0) { - cotime->minute += 60; - hours -= 1; - } - cal_obj_time_add_hours (cotime, hours); - } -} - - -/* Adds a positive or negative number of seconds to the given CalObjTime, - updating the rest of the CalObjTime appropriately. */ -static void -cal_obj_time_add_seconds (CalObjTime *cotime, - gint seconds) -{ - gint second, minutes; - - /* We use a gint to avoid overflow on the guint8. */ - second = cotime->second + seconds; - cotime->second = second % 60; - if (second >= 0) { - if (second >= 60) - cal_obj_time_add_minutes (cotime, second / 60); - } else { - minutes = second / 60; - if (cotime->second != 0) { - cotime->second += 60; - minutes -= 1; - } - cal_obj_time_add_minutes (cotime, minutes); - } -} - - -/* Compares 2 CalObjTimes. Returns -1 if the cotime1 is before cotime2, 0 if - they are the same, or 1 if cotime1 is after cotime2. The comparison type - specifies which parts of the times we are interested in, e.g. if CALOBJ_DAY - is used we only want to know if the days are different. */ -static gint -cal_obj_time_compare (CalObjTime *cotime1, - CalObjTime *cotime2, - CalObjTimeComparison type) -{ - if (cotime1->year < cotime2->year) - return -1; - if (cotime1->year > cotime2->year) - return 1; - - if (type == CALOBJ_YEAR) - return 0; - - if (cotime1->month < cotime2->month) - return -1; - if (cotime1->month > cotime2->month) - return 1; - - if (type == CALOBJ_MONTH) - return 0; - - if (cotime1->day < cotime2->day) - return -1; - if (cotime1->day > cotime2->day) - return 1; - - if (type == CALOBJ_DAY) - return 0; - - if (cotime1->hour < cotime2->hour) - return -1; - if (cotime1->hour > cotime2->hour) - return 1; - - if (type == CALOBJ_HOUR) - return 0; - - if (cotime1->minute < cotime2->minute) - return -1; - if (cotime1->minute > cotime2->minute) - return 1; - - if (type == CALOBJ_MINUTE) - return 0; - - if (cotime1->second < cotime2->second) - return -1; - if (cotime1->second > cotime2->second) - return 1; - - return 0; -} - - -/* This is the same as the above function, but without the comparison type. - It is used for qsort(). */ -static gint -cal_obj_time_compare_func (const void *arg1, - const void *arg2) -{ - CalObjTime *cotime1, *cotime2; - gint retval; - - cotime1 = (CalObjTime*) arg1; - cotime2 = (CalObjTime*) arg2; - - if (cotime1->year < cotime2->year) - retval = -1; - else if (cotime1->year > cotime2->year) - retval = 1; - - else if (cotime1->month < cotime2->month) - retval = -1; - else if (cotime1->month > cotime2->month) - retval = 1; - - else if (cotime1->day < cotime2->day) - retval = -1; - else if (cotime1->day > cotime2->day) - retval = 1; - - else if (cotime1->hour < cotime2->hour) - retval = -1; - else if (cotime1->hour > cotime2->hour) - retval = 1; - - else if (cotime1->minute < cotime2->minute) - retval = -1; - else if (cotime1->minute > cotime2->minute) - retval = 1; - - else if (cotime1->second < cotime2->second) - retval = -1; - else if (cotime1->second > cotime2->second) - retval = 1; - - else - retval = 0; - -#if 0 - g_print ("%s - ", cal_obj_time_to_string (cotime1)); - g_print ("%s : %i\n", cal_obj_time_to_string (cotime2), retval); -#endif - - return retval; -} - - -static gint -cal_obj_date_only_compare_func (const void *arg1, - const void *arg2) -{ - CalObjTime *cotime1, *cotime2; - - cotime1 = (CalObjTime*) arg1; - cotime2 = (CalObjTime*) arg2; - - if (cotime1->year < cotime2->year) - return -1; - if (cotime1->year > cotime2->year) - return 1; - - if (cotime1->month < cotime2->month) - return -1; - if (cotime1->month > cotime2->month) - return 1; - - if (cotime1->day < cotime2->day) - return -1; - if (cotime1->day > cotime2->day) - return 1; - - return 0; -} - - -/* Returns the weekday of the given CalObjTime, from 0 (Mon) - 6 (Sun). */ -static gint -cal_obj_time_weekday (CalObjTime *cotime) -{ - GDate date; - gint weekday; - - g_date_clear (&date, 1); - g_date_set_dmy (&date, cotime->day, cotime->month + 1, cotime->year); - - /* This results in a value of 0 (Monday) - 6 (Sunday). */ - weekday = g_date_weekday (&date) - 1; - - return weekday; -} - - -/* Returns the weekday of the given CalObjTime, from 0 - 6. The week start - day is Monday by default, but can be set in the recurrence rule. */ -static gint -cal_obj_time_weekday_offset (CalObjTime *cotime, - CalRecurrence *recur) -{ - GDate date; - gint weekday, offset; - - g_date_clear (&date, 1); - g_date_set_dmy (&date, cotime->day, cotime->month + 1, cotime->year); - - /* This results in a value of 0 (Monday) - 6 (Sunday). */ - weekday = g_date_weekday (&date) - 1; - - /* This calculates the offset of our day from the start of the week. - We just add on a week (to avoid any possible negative values) and - then subtract the specified week start day, then convert it into a - value from 0-6. */ - offset = (weekday + 7 - recur->week_start_day) % 7; - - return offset; -} - - -/* Returns the day of the year of the given CalObjTime, from 1 - 366. */ -static gint -cal_obj_time_day_of_year (CalObjTime *cotime) -{ - GDate date; - - g_date_clear (&date, 1); - g_date_set_dmy (&date, cotime->day, cotime->month + 1, cotime->year); - - return g_date_day_of_year (&date); -} - - -/* Finds the first week in the given CalObjTime's year, using the same weekday - as the event start day (i.e. from the RecurData). - The first week of the year is the first week starting from the specified - week start day that has 4 days in the new year. It may be in the previous - year. */ -static void -cal_obj_time_find_first_week (CalObjTime *cotime, - RecurData *recur_data) -{ - GDate date; - gint weekday, week_start_day, first_full_week_start_offset, offset; - - /* Find out the weekday of the 1st of the year, 0 (Mon) - 6 (Sun). */ - g_date_clear (&date, 1); - g_date_set_dmy (&date, 1, 1, cotime->year); - weekday = g_date_weekday (&date) - 1; - - /* Calculate the first day of the year that starts a new week, i.e. the - first week_start_day after weekday, using 0 = 1st Jan. - e.g. if the 1st Jan is a Tuesday (1) and week_start_day is a - Monday (0), the result will be (0 + 7 - 1) % 7 = 6 (7th Jan). */ - week_start_day = recur_data->recur->week_start_day; - first_full_week_start_offset = (week_start_day + 7 - weekday) % 7; - - /* Now see if we have to move backwards 1 week, i.e. if the week - starts on or after Jan 5th (since the previous week has 4 days in - this year and so will be the first week of the year). */ - if (first_full_week_start_offset >= 4) - first_full_week_start_offset -= 7; - - /* Now add the days to get to the event's weekday. */ - offset = first_full_week_start_offset + recur_data->weekday_offset; - - /* Now move the cotime to the appropriate day. */ - cotime->month = 0; - cotime->day = 1; - cal_obj_time_add_days (cotime, offset); -} - - -static void -cal_object_time_from_time (CalObjTime *cotime, - time_t t, - icaltimezone *zone) -{ - struct icaltimetype tt; - - tt = icaltime_from_timet_with_zone (t, FALSE, zone); - - cotime->year = tt.year; - cotime->month = tt.month - 1; - cotime->day = tt.day; - cotime->hour = tt.hour; - cotime->minute = tt.minute; - cotime->second = tt.second; - cotime->flags = FALSE; -} - - -/* Debugging function to convert a CalObjTime to a string. It uses a static - buffer so beware. */ -#ifdef CAL_OBJ_DEBUG -static char* -cal_obj_time_to_string (CalObjTime *cotime) -{ - static char buffer[20]; - char *weekdays[] = { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun", - " " }; - gint weekday; - - weekday = cal_obj_time_weekday (cotime); - - sprintf (buffer, "%s %02i/%02i/%04i %02i:%02i:%02i", - weekdays[weekday], - cotime->day, cotime->month + 1, cotime->year, - cotime->hour, cotime->minute, cotime->second); - return buffer; -} -#endif - - -/* This recalculates the end dates for recurrence & exception rules which use - the COUNT property. If refresh is TRUE it will recalculate all enddates - for rules which use COUNT. If refresh is FALSE, it will only calculate - the enddate if it hasn't already been set. It returns TRUE if the component - was changed, i.e. if the component should be saved at some point. - We store the enddate in the "X-EVOLUTION-ENDDATE" parameter of the RRULE - or EXRULE. */ -static gboolean -cal_recur_ensure_end_dates (CalComponent *comp, - gboolean refresh, - CalRecurResolveTimezoneFn tz_cb, - gpointer tz_cb_data) -{ - GSList *rrules, *exrules, *elem; - gboolean changed = FALSE; - - /* Do the RRULEs. */ - cal_component_get_rrule_property_list (comp, &rrules); - for (elem = rrules; elem; elem = elem->next) { - changed |= cal_recur_ensure_rule_end_date (comp, elem->data, - FALSE, refresh, - tz_cb, tz_cb_data); - } - - /* Do the EXRULEs. */ - cal_component_get_exrule_property_list (comp, &exrules); - for (elem = exrules; elem; elem = elem->next) { - changed |= cal_recur_ensure_rule_end_date (comp, elem->data, - TRUE, refresh, - tz_cb, tz_cb_data); - } - - return changed; -} - - -typedef struct _CalRecurEnsureEndDateData CalRecurEnsureEndDateData; -struct _CalRecurEnsureEndDateData { - gint count; - gint instances; - time_t end_date; -}; - - -static gboolean -cal_recur_ensure_rule_end_date (CalComponent *comp, - icalproperty *prop, - gboolean exception, - gboolean refresh, - CalRecurResolveTimezoneFn tz_cb, - gpointer tz_cb_data) -{ - struct icalrecurrencetype rule; - CalRecurEnsureEndDateData cb_data; - - if (exception) - rule = icalproperty_get_exrule (prop); - else - rule = icalproperty_get_rrule (prop); - - /* If the rule doesn't use COUNT just return. */ - if (rule.count == 0) - return FALSE; - - /* If refresh is FALSE, we check if the enddate is already set, and - if it is we just return. */ - if (!refresh) { - if (cal_recur_get_rule_end_date (prop, NULL) != -1) - return FALSE; - } - - /* Calculate the end date. Note that we initialize end_date to 0, so - if the RULE doesn't generate COUNT instances we save a time_t of 0. - Also note that we use the UTC timezone as the default timezone. - In get_end_date() if the DTSTART is a DATE or floating time, we will - convert the ENDDATE to the current timezone. */ - cb_data.count = rule.count; - cb_data.instances = 0; - cb_data.end_date = 0; - cal_recur_generate_instances_of_rule (comp, prop, -1, -1, - cal_recur_ensure_rule_end_date_cb, - &cb_data, tz_cb, tz_cb_data, - icaltimezone_get_utc_timezone ()); - - /* Store the end date in the "X-EVOLUTION-ENDDATE" parameter of the - rule. */ - cal_recur_set_rule_end_date (prop, cb_data.end_date); - - return TRUE; -} - - -static gboolean -cal_recur_ensure_rule_end_date_cb (CalComponent *comp, - time_t instance_start, - time_t instance_end, - gpointer data) -{ - CalRecurEnsureEndDateData *cb_data; - - cb_data = (CalRecurEnsureEndDateData*) data; - - cb_data->instances++; - - if (cb_data->instances == cb_data->count) { - cb_data->end_date = instance_start; - return FALSE; - } - - return TRUE; -} - - -/* If default_timezone is set, the saved ENDDATE parameter is assumed to be - in that timezone. This is used when the DTSTART is a DATE or floating - value, since the RRULE end date will change depending on the timezone that - it is evaluated in. */ -static time_t -cal_recur_get_rule_end_date (icalproperty *prop, - icaltimezone *default_timezone) -{ - icalparameter *param; - const char *xname, *xvalue; - icalvalue *value; - struct icaltimetype icaltime; - icaltimezone *zone; - - param = icalproperty_get_first_parameter (prop, ICAL_X_PARAMETER); - while (param) { - xname = icalparameter_get_xname (param); - if (xname && !strcmp (xname, EVOLUTION_END_DATE_PARAMETER)) { - xvalue = icalparameter_get_x (param); - value = icalvalue_new_from_string (ICAL_DATETIME_VALUE, - xvalue); - if (value) { - icaltime = icalvalue_get_datetime (value); - icalvalue_free (value); - - zone = default_timezone ? default_timezone : - icaltimezone_get_utc_timezone (); - return icaltime_as_timet_with_zone (icaltime, - zone); - } - } - - param = icalproperty_get_next_parameter (prop, - ICAL_X_PARAMETER); - } - - return -1; -} - - -static void -cal_recur_set_rule_end_date (icalproperty *prop, - time_t end_date) -{ - icalparameter *param; - icalvalue *value; - icaltimezone *utc_zone; - struct icaltimetype icaltime; - const char *end_date_string, *xname; - - /* We save the value as a UTC DATE-TIME. */ - utc_zone = icaltimezone_get_utc_timezone (); - icaltime = icaltime_from_timet_with_zone (end_date, FALSE, utc_zone); - value = icalvalue_new_datetime (icaltime); - end_date_string = icalvalue_as_ical_string (value); - icalvalue_free (value); - - /* If we already have an X-EVOLUTION-ENDDATE parameter, set the value - to the new date-time. */ - param = icalproperty_get_first_parameter (prop, ICAL_X_PARAMETER); - while (param) { - xname = icalparameter_get_xname (param); - if (xname && !strcmp (xname, EVOLUTION_END_DATE_PARAMETER)) { - icalparameter_set_x (param, end_date_string); - return; - } - param = icalproperty_get_next_parameter (prop, ICAL_X_PARAMETER); - } - - /* Create a new X-EVOLUTION-ENDDATE and add it to the property. */ - param = icalparameter_new_x (end_date_string); - icalparameter_set_xname (param, EVOLUTION_END_DATE_PARAMETER); - icalproperty_add_parameter (prop, param); -} - |