Copyright 2003-2016 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.
/**
* Parses child components of vTimezone component.
*
* Returns an array with the exact time of the time change as well as the
* 'from' and 'to' offsets around the change. Time is arbitrarily based on
* UTC for comparison.
*
* @param Horde_Icalendar_Standard|Horde_Icalendar_Daylight $child
* A timezone component.
* @param integer $year
* The latest year we are interested in.
*
* @return array A list of hashes with "time", "from", and "to" elements.
*/
public function parseChild($child, $year)
{
$result['time'] = $result['end'] = 0;
try {
$t = $child->getAttribute('TZOFFSETFROM');
} catch (Horde_Icalendar_Exception $e) {
return array();
}
$result['from'] = ($t['hour'] * 60 * 60 + $t['minute'] * 60) * ($t['ahead'] ? 1 : -1);
try {
$t = $child->getAttribute('TZOFFSETTO');
} catch (Horde_Icalendar_Exception $e) {
return array();
}
$result['to'] = ($t['hour'] * 60 * 60 + $t['minute'] * 60) * ($t['ahead'] ? 1 : -1);
try {
$start = $child->getAttribute('DTSTART');
} catch (Horde_Icalendar_Exception $e) {
return array();
}
if (!is_int($start)) {
return array();
}
$start = getdate($start);
if ($start['year'] > $year) {
return array();
}
$results = array();
try {
$rdates = $child->getAttributeValues('RDATE');
foreach ($rdates as $rdate) {
if ($rdate['year'] == $year || $rdate['year'] == $year - 1) {
$result['time'] = $result['end'] = gmmktime($start['hours'], $start['minutes'], $start['seconds'], $rdate['month'], $rdate['mday'], $rdate['year']);
$results[] = $result;
}
}
} catch (Horde_Icalendar_Exception $e) {
}
try {
$rrules = $child->getAttribute('RRULE');
} catch (Horde_Icalendar_Exception $e) {
if (!$results) {
$result['time'] = $result['end'] = $start[0];
$results[] = $result;
}
return $results;
}
$rrules = explode(';', $rrules);
foreach ($rrules as $rrule) {
$t = explode('=', $rrule);
switch ($t[0]) {
case 'FREQ':
if ($t[1] != 'YEARLY') {
return array();
}
break;
case 'INTERVAL':
if ($t[1] != '1') {
return array();
}
break;
case 'BYMONTH':
$month = intval($t[1]);
break;
case 'BYDAY':
$len = strspn($t[1], '1234567890-+');
if ($len == 0) {
return array();
}
$weekday = substr($t[1], $len);
$weekdays = array('SU' => 0, 'MO' => 1, 'TU' => 2, 'WE' => 3, 'TH' => 4, 'FR' => 5, 'SA' => 6);
$weekday = $weekdays[$weekday];
$which = intval(substr($t[1], 0, $len));
break;
case 'UNTIL':
$result['end'] = intval(substr($t[1], 0, 4));
break;
}
}
if (empty($month) || !isset($weekday)) {
return array();
}
// Get the timestamp for the first day of $month.
$when = gmmktime($start['hours'], $start['minutes'], $start['seconds'], $month, 1, $year);
// Get the day of the week for the first day of $month.
$first_of_month_weekday = intval(gmstrftime('%w', $when));
// Go to the first $weekday before first day of $month.
if ($weekday >= $first_of_month_weekday) {
$weekday -= 7;
}
$when -= ($first_of_month_weekday - $weekday) * 60 * 60 * 24;
// If going backwards go to the first $weekday after last day
// of $month.
if ($which < 0) {
do {
$when += 60 * 60 * 24 * 7;
} while (intval(gmstrftime('%m', $when)) == $month);
}
// Calculate $weekday number $which.
$when += $which * 60 * 60 * 24 * 7;
$result['time'] = $when;
$results[] = $result;
return $results;
}
/**
* 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])) {
$match[2] = 0;
}
if ($rule[2] == $rule[3] && preg_match('/^\\d+$/', $rule[6])) {
// Rule lasts only for a single year and starts on a specific
// date.
$rdate = new Horde_Date(array('year' => $rule[2], 'month' => Horde_Timezone::getMonth($rule[5]), 'mday' => $rule[6], 'hour' => $match[1], 'min' => $match[2], 'sec' => 0));
$component->setAttribute('DTSTART', $rdate);
} elseif (substr($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);
}
$component->setAttribute('TZNAME', sprintf($name, $rule[9]));
$tz->addComponent($component);
}
}
/**
* 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 $end = null)
{
foreach ($this->_rules as $ruleNo => $rule) {
// The rule items are:
// 0: "Rule"
// 1: The rule name
// 2: The start year or "minimum"
// 3: The end year or "only" if only at the start year or "maximum"
// 4: Type, whatever that means (unused)
// 5: The start month
// 6: The start day, either specific or as a rule
// 7: The start time
// 8: The offset to the base time
// 9: The time name abbreviation
$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;
}
// The month of rule start.
$month = Horde_Timezone::getMonth($rule[5]);
// The time of rule start.
preg_match('/(\\d+)(?::(\\d+))?(?::(\\d+))?([wsguz])?/', $rule[7], $match);
$hour = $match[1];
$minute = isset($match[2]) ? $match[2] : 0;
if (!isset($match[4])) {
$modifier = 'w';
} elseif ($match[4] == 'g' || $match[4] == 'z') {
$modifier = 'u';
} else {
$modifier = $match[4];
}
// Find the start date.
$first = $this->_getFirstMatch($rule, $rule[2]);
$first->hour = $hour;
$first->min = $minute;
$previousOffset = $this->_findPreviousOffset($first, $ruleNo, $startOffset);
if ($rule[8] == 0) {
$component = new Horde_Icalendar_Standard();
$component->setAttribute('TZOFFSETFROM', $previousOffset);
$component->setAttribute('TZOFFSETTO', $startOffset);
} else {
$component = new Horde_Icalendar_Daylight();
$component->setAttribute('TZOFFSETFROM', $previousOffset);
$component->setAttribute('TZOFFSETTO', $this->_getOffset($startOffset, $rule[8]));
}
switch ($modifier) {
case 's':
$first->hour += ($previousOffset['ahead'] ? 1 : -1) * $previousOffset['hour'] - ($startOffset['ahead'] ? 1 : -1) * $startOffset['hour'];
$first->min += ($previousOffset['ahead'] ? 1 : -1) * $previousOffset['minute'] - ($startOffset['ahead'] ? 1 : -1) * $startOffset['minute'];
break;
case 'u':
$first->hour += ($previousOffset['ahead'] ? 1 : -1) * $previousOffset['hour'];
$first->min += ($previousOffset['ahead'] ? 1 : -1) * $previousOffset['minute'];
break;
}
$component->setAttribute('DTSTART', $first);
// Find the end date.
if ($rule[3][0] == 'm') {
$until = '';
} else {
$last = $this->_getFirstMatch($rule, $rule[3]);
$last->hour = $hour;
$last->min = $minute;
switch ($modifier) {
case 's':
$last->hour -= ($startOffset['ahead'] ? 1 : -1) * $startOffset['hour'];
$last->min -= ($startOffset['ahead'] ? 1 : -1) * $startOffset['minute'];
break;
case 'w':
$last->hour -= ($previousOffset['ahead'] ? 1 : -1) * $previousOffset['hour'];
$last->min -= ($previousOffset['ahead'] ? 1 : -1) * $previousOffset['minute'];
break;
}
$until = ';UNTIL=' . $last->format('Ymd\\THis') . 'Z';
}
if ($rule[2] != $rule[3]) {
if (preg_match('/^\\d+$/', $rule[6])) {
// Rule starts on a specific date.
$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.
$component->setAttribute('RRULE', 'FREQ=YEARLY;BYDAY=-1' . Horde_String::upper(substr($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('>=', $rule[6]);
for ($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.
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);
}
}