87 lines
3 KiB
PHP
87 lines
3 KiB
PHP
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<?php
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/**
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* Recurrence computation class for the Calendar plugin
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*
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* Uitility class to compute instances of recurring events.
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*
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* @version 0.7-beta
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* @author Thomas Bruederli <roundcube@gmail.com>
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* @package calendar
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*
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* Copyright (C) 2011, Kolab Systems AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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class calendar_recurrence
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{
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private $cal;
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private $event;
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private $engine;
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private $tz_offset = 0;
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private $dst_start = false;
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private $hour = 0;
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/**
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* Default constructor
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*
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* @param object calendar The calendar plugin instance
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* @param array The event object to operate on
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*/
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function __construct($cal, $event)
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{
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$this->cal = $cal;
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// use Horde classes to compute recurring instances
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// TODO: replace with something that has less than 6'000 lines of code
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require_once($this->cal->home . '/lib/Horde_Date_Recurrence.php');
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$this->event = $event;
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$this->engine = new Horde_Date_Recurrence($event['start']);
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$this->engine->fromRRule20(calendar::to_rrule($event['recurrence']));
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if (is_array($event['recurrence']['EXDATE'])) {
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foreach ($event['recurrence']['EXDATE'] as $exdate)
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$this->engine->addException(date('Y', $exdate), date('n', $exdate), date('j', $exdate));
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}
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$this->tz_offset = $event['allday'] ? $this->cal->gmt_offset - date('Z') : 0;
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$this->next = new Horde_Date($event['start'] + $this->tz_offset); # shift all-day times to server timezone because computation operates in local TZ
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$this->dst_start = $this->next->format('I');
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$this->hour = $this->next->hour;
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}
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/**
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* Get timestamp of the next occurence of this event
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*
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* @return mixed Unix timestamp or False if recurrence ended
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*/
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public function next_start()
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{
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$time = false;
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if ($this->next && ($next = $this->engine->nextActiveRecurrence(array('year' => $this->next->year, 'month' => $this->next->month, 'mday' => $this->next->mday + 1, 'hour' => $this->next->hour, 'min' => $this->next->min, 'sec' => $this->next->sec)))) {
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if ($this->event['allday']) {
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$next->hour = $this->hour; # fix time for all-day events
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$next->min = 0;
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}
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# $dst_diff = ($this->dst_start - $next->format('I')) * 3600; # consider difference in daylight saving between base event and recurring instance
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$time = $next->timestamp() - $this->tz_offset;
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$this->next = $next;
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}
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return $time;
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}
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}
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