105 lines
3.6 KiB
PHP
105 lines
3.6 KiB
PHP
<?php
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/**
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* Recurrence computation class for xcal-based Kolab format objects
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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 @package_version@
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* @author Thomas Bruederli <bruederli@kolabsys.com>
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*
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* Copyright (C) 2012, Kolab Systems AG <contact@kolabsys.com>
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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 Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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class kolab_date_recurrence
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{
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private $engine;
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private $tz_offset = 0;
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private $allday = false;
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private $hour = 0;
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/**
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* Default constructor
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*
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* @param array The Kolab object to operate on
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*/
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function __construct($object)
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{
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// use (copied) 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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$this->engine = new Horde_Date_Recurrence($object['start']);
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$this->engine->fromRRule20($this->to_rrule($object['recurrence'])); // TODO: get that string directly from libkolabxml
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foreach ((array)$object['recurrence']['EXDATE'] as $exdate)
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$this->engine->addException(date('Y', $exdate), date('n', $exdate), date('j', $exdate));
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$now = new DateTime('now', kolab_format::$timezone);
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$this->tz_offset = $object['allday'] ? $now->getOffset() - date('Z') : 0;
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$this->next = new Horde_Date($object['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->allday = $object['allday'];
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$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->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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# consider difference in daylight saving between base event and recurring instance
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$dst_diff = ($this->dst_start - $next->format('I')) * 3600;
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$time = $next->timestamp() - $this->tz_offset - $dst_diff;
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$this->next = $next;
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}
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return $time;
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}
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/**
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* Convert the internal structured data into a vcalendar RRULE 2.0 string
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*/
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private function to_rrule($recurrence)
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{
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if (is_string($recurrence))
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return $recurrence;
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$rrule = '';
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foreach ((array)$recurrence as $k => $val) {
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$k = strtoupper($k);
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switch ($k) {
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case 'UNTIL':
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$val = gmdate('Ymd\THis', $val);
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break;
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case 'EXDATE':
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foreach ((array)$val as $i => $ex)
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$val[$i] = gmdate('Ymd\THis', $ex);
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$val = join(',', (array)$val);
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break;
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}
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$rrule .= $k . '=' . $val . ';';
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}
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return $rrule;
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}
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}
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