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255 lines
7.2 KiB
PHP
255 lines
7.2 KiB
PHP
<?php
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/**
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* Class representing vTimezones.
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*
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* $Horde: framework/iCalendar/iCalendar/vtimezone.php,v 1.8.10.9 2008/07/03 08:42:58 jan Exp $
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*
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* Copyright 2003-2008 The Horde Project (http://www.horde.org/)
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*
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* See the enclosed file COPYING for license information (LGPL). If you
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* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
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*
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* @author Mike Cochrane <mike@graftonhall.co.nz>
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* @since Horde 3.0
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* @package Horde_iCalendar
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* @changes 2010/02/26 Joerg Lehrke <jlehrke@noc.de>: Add RDATE support (for KDE 4.x)
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*/
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class Horde_iCalendar_vtimezone extends Horde_iCalendar {
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function getType()
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{
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return 'vTimeZone';
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}
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function exportvCalendar()
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{
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return parent::_exportvData('VTIMEZONE');
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}
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/**
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* Parse child components of the vTimezone component. Returns an
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* array with the exact time of the time change as well as the
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* 'from' and 'to' offsets around the change. Time is arbitrarily
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* based on UTC for comparison.
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*/
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function parseChild(&$child, $year)
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{
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// Make sure 'time' key is first for sort().
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$result['time'] = 0;
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$rrule_interval = 0; // 0 undefined, 1 yearly, 12 monthly
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$t = $child->getAttribute('TZOFFSETFROM');
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if (is_a($t, 'PEAR_Error')) {
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return false;
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}
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$result['from'] = ($t['hour'] * 60 * 60 + $t['minute'] * 60) * ($t['ahead'] ? 1 : -1);
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$t = $child->getAttribute('TZOFFSETTO');
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if (is_a($t, 'PEAR_Error')) {
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return false;
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}
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$result['to'] = ($t['hour'] * 60 * 60 + $t['minute'] * 60) * ($t['ahead'] ? 1 : -1);
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$switch_time = $child->getAttribute('DTSTART');
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if (is_a($switch_time, 'PEAR_Error')) {
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return false;
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}
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$rdates = $child->getAttribute('RDATE');
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if (!is_a($rdates, 'PEAR_Error')) {
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foreach ($rdates as $rdate) {
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$switch_time = $switch_time['value'];
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$switch_year = date("Y", $switch_time);
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if ($switch_year == $year) {
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$t = getdate($switch_time);
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$result['time'] = @gmmktime($t['hours'], $t['minutes'], $t['seconds'],
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$t['mon'], $t['mday'], $t['year']);
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return $result;
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}
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}
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}
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$rrules = $child->getAttribute('RRULE');
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if (is_a($rrules, 'PEAR_Error')) {
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if (!is_int($switch_time)) {
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return false;
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}
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// Convert this timestamp from local time to UTC for
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// comparison (All dates are compared as if they are UTC).
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$t = getdate($switch_time);
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$result['time'] = @gmmktime($t['hours'], $t['minutes'], $t['seconds'],
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$t['mon'], $t['mday'], $t['year']);
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return $result;
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}
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$switch_year = date("Y", $switch_time);
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if ($switch_year > $year) {
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return false;
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}
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$rrules = explode(';', $rrules);
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foreach ($rrules as $rrule) {
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$t = explode('=', $rrule);
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switch ($t[0]) {
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case 'FREQ':
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switch($t[1]) {
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case 'YEARLY':
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if ($rrule_interval == 12) {
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return false;
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}
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$rrule_interval = 1;
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break;
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case 'MONTHLY':
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if ($rrule_interval == 1) {
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return false;
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}
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$rrule_interval = 12;
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break;
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default:
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return false;
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}
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break;
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case 'INTERVAL':
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if ($rrule_interval && $t[1] != $rrule_interval) {
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return false;
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}
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$rrule_interval = intval($t[1]);
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if ($rrule_interval != 1 && $rrule_interval != 12) {
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return false;
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}
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break;
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case 'COUNT':
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if ($switch_year + intval($t[1]) < intval($year)) {
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return false;
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}
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break;
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case 'BYMONTH':
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$month = intval($t[1]);
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break;
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case 'BYDAY':
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$len = strspn($t[1], '1234567890-+');
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if ($len == 0) {
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return false;
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}
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$weekday = substr($t[1], $len);
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$weekdays = array(
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'SU' => 0,
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'MO' => 1,
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'TU' => 2,
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'WE' => 3,
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'TH' => 4,
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'FR' => 5,
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'SA' => 6
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);
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$weekday = $weekdays[$weekday];
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$which = intval(substr($t[1], 0, $len));
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break;
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case 'UNTIL':
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if (intval($year) > intval(substr($t[1], 0, 4))) {
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return false;
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}
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break;
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}
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}
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if ($rrule_interval == 12) {
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$month = date("n", $switch_time);
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}
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if (empty($month) || !isset($weekday)) {
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return false;
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}
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if (is_int($switch_time)) {
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// Was stored as localtime.
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$switch_time = strftime('%H:%M:%S', $switch_time);
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$switch_time = explode(':', $switch_time);
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} else {
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$switch_time = explode('T', $switch_time);
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if (count($switch_time) != 2) {
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return false;
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}
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$switch_time[0] = substr($switch_time[1], 0, 2);
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$switch_time[2] = substr($switch_time[1], 4, 2);
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$switch_time[1] = substr($switch_time[1], 2, 2);
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}
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// Get the timestamp for the first day of $month.
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$when = gmmktime($switch_time[0], $switch_time[1], $switch_time[2],
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$month, 1, $year);
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// Get the day of the week for the first day of $month.
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$first_of_month_weekday = intval(gmstrftime('%w', $when));
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// Go to the first $weekday before first day of $month.
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if ($weekday >= $first_of_month_weekday) {
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$weekday -= 7;
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}
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$when -= ($first_of_month_weekday - $weekday) * 60 * 60 * 24;
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// If going backwards go to the first $weekday after last day
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// of $month.
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if ($which < 0) {
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do {
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$when += 60*60*24*7;
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} while (intval(gmstrftime('%m', $when)) == $month);
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}
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// Calculate $weekday number $which.
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$when += $which * 60 * 60 * 24 * 7;
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$result['time'] = $when;
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return $result;
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}
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}
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/**
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* @package Horde_iCalendar
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*/
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class Horde_iCalendar_standard extends Horde_iCalendar {
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function getType()
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{
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return 'standard';
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}
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function parsevCalendar($data)
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{
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parent::parsevCalendar($data, 'STANDARD');
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}
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function exportvCalendar()
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{
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return parent::_exportvData('STANDARD');
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}
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}
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/**
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* @package Horde_iCalendar
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*/
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class Horde_iCalendar_daylight extends Horde_iCalendar {
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function getType()
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{
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return 'daylight';
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}
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function parsevCalendar($data)
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{
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parent::parsevCalendar($data, 'DAYLIGHT');
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}
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function exportvCalendar()
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{
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return parent::_exportvData('DAYLIGHT');
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}
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}
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