/
Rule.php
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/
Rule.php
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<?php
/**
* Class representing a set of "Rule" timezone database entries of the
* same name.
*
* Copyright 2011-2016 Horde LLC (http://www.horde.org/)
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.horde.org/licenses/lgpl21.
*
* @author Jan Schneider <jan@horde.org>
* @package Timezone
*/
class Horde_Timezone_Rule
{
/**
* A ruleset name.
*
* @var string
*/
protected $_name;
/**
* All Rule lines for this ruleset.
*
* @var array
*/
protected $_rules = array();
/**
* List to map weekday descriptions used in the timezone database.
*
* @var array
*/
protected $_weekdays = array('Mon' => Horde_Date::DATE_MONDAY,
'Tue' => Horde_Date::DATE_TUESDAY,
'Wed' => Horde_Date::DATE_WEDNESDAY,
'Thu' => Horde_Date::DATE_THURSDAY,
'Fri' => Horde_Date::DATE_FRIDAY,
'Sat' => Horde_Date::DATE_SATURDAY,
'Sun' => Horde_Date::DATE_SUNDAY);
/**
* Constructor.
*
* @param string $name A ruleset name.
*/
public function __construct($name)
{
$this->_name = $name;
}
/**
* Adds a Rule line to this ruleset.
*
* @param array $rule A parsed Rule line.
*/
public function add($rule)
{
$this->_rules[] = $rule;
}
/**
* Adds rules from this ruleset to a VTIMEZONE component.
*
* @param Horde_Icalendar_Vtimezone $tz A VTIMEZONE component.
* @param string $tzid The timezone ID of the component.
* @param string $name A timezone name abbreviation.
* May contain a placeholder that is
* replaced the Rules' "Letter(s)"
* entry.
* @param array $startOffset An offset hash describing the
* base offset of a timezone.
* @param Horde_Date $start Start of the period to add rules
* for.
* @param Horde_Date $end End of the period to add rules
* for.
*/
public function addRules(Horde_Icalendar_Vtimezone $tz, $tzid, $name,
$startOffset,
Horde_Date $start, Horde_Date $end = null)
{
$offset = $startOffset;
foreach ($this->_rules as $rule) {
$year = $rule[3];
if ($year[0] == 'o') {
// TO is "only"
$rule[3] = $rule[2];
}
if ($rule[3][0] != 'm' && $rule[3] < $start->year) {
// TO is not maximum and is before the searched period
continue;
}
if ($end &&
$rule[2][0] != 'm' && $rule[2] > $end->year) {
// FROM is not "minimum" and is after the searched period
break;
}
if ($rule[2][0] != 'm' && $rule[2] < $start->year) {
$rule[2] = $start->year;
}
if ($rule[8] == 0) {
$component = new Horde_Icalendar_Standard();
$component->setAttribute('TZOFFSETFROM', $offset);
$component->setAttribute('TZOFFSETTO', $startOffset);
$offset = $startOffset;
} else {
$component = new Horde_Icalendar_Daylight();
$component->setAttribute('TZOFFSETFROM', $offset);
$offset = $this->_getOffset($startOffset, $rule[8]);
$component->setAttribute('TZOFFSETTO', $offset);
}
$month = Horde_Timezone::getMonth($rule[5]);
// Retrieve time of rule start.
preg_match('/(\d+)(?::(\d+))?(?::(\d+))?(w|s|u)?/', $rule[7], $match);
if (!isset($match[2])) {
$match[2] = 0;
}
if (preg_match('/^\d+$/', $rule[6])) {
// Rule starts on a specific date.
$rdate = new Horde_Date(
array('year' => $rule[2],
'month' => $month,
'mday' => $rule[6],
'hour' => $match[1],
'min' => $match[2],
'sec' => 0)
);
$component->setAttribute('DTSTART', $rdate);
if ($rule[2] != $rule[3]) {
// Rule lasts more than a single year.
if ($rule[3][0] == 'm') {
$until = '';
} else {
$last = new Horde_Date(
array('year' => $rule[3],
'month' => $month,
'mday' => $rule[6],
'hour' => $match[1],
'min' => $match[2],
'sec' => 0),
$tzid);
$last->setTimezone('UTC');
$until = ';UNTIL=' . $last->format('Ymd\THis') . 'Z';
$component->setAttribute(
'RRULE',
'FREQ=YEARLY;BYMONTH=' . $month
. ';BYMONTHDAY=' . $rule[6]
. $until);
}
}
} elseif (substr($rule[6], 0, 4) == 'last') {
// Rule starts on the last of a certain weekday of the month.
$weekday = $this->_weekdays[substr($rule[6], 4, 3)];
$last = new Horde_Date(array(
'year' => $rule[2],
'month' => $month,
'mday' => Horde_Date_Utils::daysInMonth($month, $rule[2]),
'hour' => $match[1],
'min' => $match[2],
'sec' => 0
));
while ($last->dayOfWeek() != $weekday) {
$last->mday--;
}
$component->setAttribute('DTSTART', $last);
if ($rule[3][0] == 'm') {
$until = '';
} else {
$last = new Horde_Date(
array('year' => $rule[3],
'month' => $month,
'mday' => Horde_Date_Utils::daysInMonth($month, $rule[2]),
'hour' => $match[1],
'min' => $match[2],
'sec' => 0),
$tzid);
while ($last->dayOfWeek() != $weekday) {
$last->mday--;
}
$last->setTimezone('UTC');
$until = ';UNTIL=' . $last->format('Ymd\THis') . 'Z';
}
$component->setAttribute(
'RRULE',
'FREQ=YEARLY;BYDAY=-1'
. Horde_String::upper(substr($rule[6], 4, 2))
. ';BYMONTH=' . $month . $until);
} elseif (strpos($rule[6], '>=')) {
// Rule starts on a certain weekday after a certain day of
// month.
list($weekday, $day) = explode('>=', $rule[6]);
$weekdayInt = $this->_weekdays[substr($weekday, 0, 3)];
$first = new Horde_Date(array(
'year' => $rule[2],
'month' => $month,
'mday' => $day,
'hour' => $match[1],
'min' => $match[2],
'sec' => 0
));
while ($first->dayOfWeek() != $weekdayInt) {
$first->mday++;
}
$component->setAttribute('DTSTART', $first);
if ($rule[3][0] == 'm') {
$until = '';
} else {
$last = new Horde_Date(
array('year' => $rule[3],
'month' => $month,
'mday' => $day,
'hour' => $match[1],
'min' => $match[2],
'sec' => 0),
$tzid);
while ($last->dayOfWeek() != $weekday) {
$last->mday++;
}
$last->setTimezone('UTC');
$until = ';UNTIL=' . $last->format('Ymd\THis') . 'Z';
}
for ($days = array(), $i = $day, $lastDay = min(Horde_Date_Utils::daysInMonth($month, $rule[2]), $i + 6);
$day > 1 && $i <= $lastDay;
$i++) {
$days[] = $i;
}
$component->setAttribute(
'RRULE',
'FREQ=YEARLY;BYMONTH=' . $month
. ($days ? (';BYMONTHDAY=' . implode(',', $days)) : '')
. ';BYDAY=1' . Horde_String::upper(substr($weekday, 0, 2))
. $until);
} elseif (strpos($rule[6], '<=')) {
// Rule starts on a certain weekday before a certain day of
// month.
list($weekday, $day) = explode('>=', $rule[6]);
$weekdayInt = $this->_weekdays[substr($weekday, 0, 3)];
$last = new Horde_Date(array(
'year' => $rule[2],
'month' => $month,
'mday' => $day,
'hour' => $match[1],
'min' => $match[2],
'sec' => 0
));
while ($last->dayOfWeek() != $weekdayInt) {
$last->mday--;
}
$component->setAttribute('DTSTART', $last);
if ($rule[3][0] == 'm') {
$until = '';
} else {
$last = new Horde_Date(
array('year' => $rule[3],
'month' => $month,
'mday' => $day,
'hour' => $match[1],
'min' => $match[2],
'sec' => 0),
$tzid);
while ($last->dayOfWeek() != $weekday) {
$last->mday--;
}
$last->setTimezone('UTC');
$until = ';UNTIL=' . $last->format('Ymd\THis') . 'Z';
}
for ($days = array(), $i = 1; $i <= $day; $i++) {
$days[] = $i;
}
$component->setAttribute(
'RRULE',
'FREQ=YEARLY;BYMONTH=' . $month
. ';BYMONTHDAY=' . implode(',', $days)
. ';BYDAY=-1' . Horde_String::upper(substr($weekday, 0, 2))
. $until);
} else {
continue;
}
$component->setAttribute('TZNAME', sprintf($name, $rule[9]));
$tz->addComponent($component);
}
}
/**
* Calculates the new offset of a timezone.
*
* @param array $start A hash describing the original timezone offset.
* @param string $new A string describing the offset to be added to (or
* subtracted from) the original offset.
*
* @return array A hash describing the new timezone offset.
*/
protected function _getOffset($start, $new)
{
$start = ($start['ahead'] ? 1 : -1) * (60 * $start['hour'] + $start['minute']);
preg_match('/(-)?(\d+):(\d+)/', $new, $match);
$start += ($match[1] == '-' ? -1 : 1) * (60 * $match[2] + $match[3]);
$result = array('ahead' => $start > 0);
$start = abs($start);
$result['hour'] = floor($start / 60);
$result['minute'] = $start % 60;
return $result;
}
}