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friendica-addons/dav/SabreDAV/lib/Sabre/VObject/RecurrenceIterator.php

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Initial Release of the calendar plugin
2012-06-03 20:19:28 +02:00
<?php
/**
* This class is used to determine new for a recurring event, when the next
* events occur.
*
* This iterator may loop infinitely in the future, therefore it is important
* that if you use this class, you set hard limits for the amount of iterations
* you want to handle.
*
* Note that currently there is not full support for the entire iCalendar
* specification, as it's very complex and contains a lot of permutations
* that's not yet used very often in software.
*
* For the focus has been on features as they actually appear in Calendaring
* software, but this may well get expanded as needed / on demand
*
* The following RRULE properties are supported
* * UNTIL
* * INTERVAL
* * COUNT
* * FREQ=DAILY
* * BYDAY
* * FREQ=WEEKLY
* * BYDAY
* * WKST
* * FREQ=MONTHLY
* * BYMONTHDAY
* * BYDAY
* * BYSETPOS
* * FREQ=YEARLY
* * BYMONTH
* * BYMONTHDAY (only if BYMONTH is also set)
* * BYDAY (only if BYMONTH is also set)
*
* Anything beyond this is 'undefined', which means that it may get ignored, or
* you may get unexpected results. The effect is that in some applications the
* specified recurrence may look incorrect, or is missing.
*
* @package Sabre
* @subpackage VObject
* @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
* @author Evert Pot (http://www.rooftopsolutions.nl/)
* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
*/
class Sabre_VObject_RecurrenceIterator implements Iterator {
/**
* The initial event date
*
* @var DateTime
*/
public $startDate;
/**
* The end-date of the initial event
*
* @var DateTime
*/
public $endDate;
/**
* The 'current' recurrence.
*
* This will be increased for every iteration.
*
* @var DateTime
*/
public $currentDate;
/**
* List of dates that are excluded from the rules.
*
* This list contains the items that have been overriden by the EXDATE
* property.
*
* @var array
*/
public $exceptionDates = array();
/**
* Base event
*
* @var Sabre_VObject_Component_VEvent
*/
public $baseEvent;
/**
* List of dates that are overridden by other events.
* Similar to $overriddenEvents, but this just contains the original dates.
*
* @var array
*/
public $overriddenDates = array();
/**
* list of events that are 'overridden'.
*
* This is an array of Sabre_VObject_Component_VEvent objects.
*
* @var array
*/
public $overriddenEvents = array();
/**
* Frequency is one of: secondly, minutely, hourly, daily, weekly, monthly,
* yearly.
*
* @var string
*/
public $frequency;
/**
* The last instance of this recurrence, inclusively
*
* @var DateTime|null
*/
public $until;
/**
* The number of recurrences, or 'null' if infinitely recurring.
*
* @var int
*/
public $count;
/**
* The interval.
*
* If for example frequency is set to daily, interval = 2 would mean every
* 2 days.
*
* @var int
*/
public $interval = 1;
/**
* Which seconds to recur.
*
* This is an array of integers (between 0 and 60)
*
* @var array
*/
public $bySecond;
/**
* Which minutes to recur
*
* This is an array of integers (between 0 and 59)
*
* @var array
*/
public $byMinute;
/**
* Which hours to recur
*
* This is an array of integers (between 0 and 23)
*
* @var array
*/
public $byHour;
/**
* Which weekdays to recur.
*
* This is an array of weekdays
*
* This may also be preceeded by a positive or negative integer. If present,
* this indicates the nth occurrence of a specific day within the monthly or
* yearly rrule. For instance, -2TU indicates the second-last tuesday of
* the month, or year.
*
* @var array
*/
public $byDay;
/**
* Which days of the month to recur
*
* This is an array of days of the months (1-31). The value can also be
* negative. -5 for instance means the 5th last day of the month.
*
* @var array
*/
public $byMonthDay;
/**
* Which days of the year to recur.
*
* This is an array with days of the year (1 to 366). The values can also
* be negative. For instance, -1 will always represent the last day of the
* year. (December 31st).
*
* @var array
*/
public $byYearDay;
/**
* Which week numbers to recur.
*
* This is an array of integers from 1 to 53. The values can also be
* negative. -1 will always refer to the last week of the year.
*
* @var array
*/
public $byWeekNo;
/**
* Which months to recur
*
* This is an array of integers from 1 to 12.
*
* @var array
*/
public $byMonth;
/**
* Which items in an existing st to recur.
*
* These numbers work together with an existing by* rule. It specifies
* exactly which items of the existing by-rule to filter.
*
* Valid values are 1 to 366 and -1 to -366. As an example, this can be
* used to recur the last workday of the month.
*
* This would be done by setting frequency to 'monthly', byDay to
* 'MO,TU,WE,TH,FR' and bySetPos to -1.
*
* @var array
*/
public $bySetPos;
/**
* When a week starts
*
* @var string
*/
public $weekStart = 'MO';
/**
* The current item in the list
*
* @var int
*/
public $counter = 0;
/**
* Simple mapping from iCalendar day names to day numbers
*
* @var array
*/
private $dayMap = array(
'SU' => 0,
'MO' => 1,
'TU' => 2,
'WE' => 3,
'TH' => 4,
'FR' => 5,
'SA' => 6,
);
/**
* Mappings between the day number and english day name.
*
* @var array
*/
private $dayNames = array(
0 => 'Sunday',
1 => 'Monday',
2 => 'Tuesday',
3 => 'Wednesday',
4 => 'Thursday',
5 => 'Friday',
6 => 'Saturday',
);
/**
* If the current iteration of the event is an overriden event, this
* property will hold the VObject
*
* @var Sabre_VObject_Component
*/
private $currentOverriddenEvent;
/**
* This property may contain the date of the next not-overridden event.
* This date is calculated sometimes a bit early, before overridden events
* are evaluated.
*
* @var DateTime
*/
private $nextDate;
/**
* Creates the iterator
*
* You should pass a VCALENDAR component, as well as the UID of the event
* we're going to traverse.
*
* @param Sabre_VObject_Component $vcal
* @param string|null $uid
*/
public function __construct(Sabre_VObject_Component $vcal, $uid=null) {
if (is_null($uid)) {
if ($vcal->name === 'VCALENDAR') {
throw new InvalidArgumentException('If you pass a VCALENDAR object, you must pass a uid argument as well');
}
$components = array($vcal);
$uid = (string)$vcal->uid;
} else {
$components = $vcal->select('VEVENT');
}
foreach($components as $component) {
if ((string)$component->uid == $uid) {
if (isset($component->{'RECURRENCE-ID'})) {
$this->overriddenEvents[$component->DTSTART->getDateTime()->getTimeStamp()] = $component;
$this->overriddenDates[] = $component->{'RECURRENCE-ID'}->getDateTime();
} else {
$this->baseEvent = $component;
}
}
}
if (!$this->baseEvent) {
throw new InvalidArgumentException('Could not find a base event with uid: ' . $uid);
}
$this->startDate = clone $this->baseEvent->DTSTART->getDateTime();
$this->endDate = null;
if (isset($this->baseEvent->DTEND)) {
$this->endDate = clone $this->baseEvent->DTEND->getDateTime();
} else {
$this->endDate = clone $this->startDate;
if (isset($this->baseEvent->DURATION)) {
$this->endDate->add(Sabre_VObject_DateTimeParser::parse($this->baseEvent->DURATION->value));
}
}
$this->currentDate = clone $this->startDate;
$rrule = (string)$this->baseEvent->RRULE;
$parts = explode(';', $rrule);
// If no rrule was specified, we create a default setting
if (!$rrule) {
$this->frequency = 'daily';
$this->count = 1;
} else foreach($parts as $part) {
list($key, $value) = explode('=', $part, 2);
switch(strtoupper($key)) {
case 'FREQ' :
if (!in_array(
strtolower($value),
array('secondly','minutely','hourly','daily','weekly','monthly','yearly')
)) {
throw new InvalidArgumentException('Unknown value for FREQ=' . strtoupper($value));
}
$this->frequency = strtolower($value);
break;
case 'UNTIL' :
$this->until = Sabre_VObject_DateTimeParser::parse($value);
break;
case 'COUNT' :
$this->count = (int)$value;
break;
case 'INTERVAL' :
$this->interval = (int)$value;
break;
case 'BYSECOND' :
$this->bySecond = explode(',', $value);
break;
case 'BYMINUTE' :
$this->byMinute = explode(',', $value);
break;
case 'BYHOUR' :
$this->byHour = explode(',', $value);
break;
case 'BYDAY' :
$this->byDay = explode(',', strtoupper($value));
break;
case 'BYMONTHDAY' :
$this->byMonthDay = explode(',', $value);
break;
case 'BYYEARDAY' :
$this->byYearDay = explode(',', $value);
break;
case 'BYWEEKNO' :
$this->byWeekNo = explode(',', $value);
break;
case 'BYMONTH' :
$this->byMonth = explode(',', $value);
break;
case 'BYSETPOS' :
$this->bySetPos = explode(',', $value);
break;
case 'WKST' :
$this->weekStart = strtoupper($value);
break;
}
}
// Parsing exception dates
if (isset($this->baseEvent->EXDATE)) {
foreach($this->baseEvent->EXDATE as $exDate) {
foreach(explode(',', (string)$exDate) as $exceptionDate) {
$this->exceptionDates[] =
Sabre_VObject_DateTimeParser::parse($exceptionDate, $this->startDate->getTimeZone());
}
}
}
}
/**
* Returns the current item in the list
*
* @return DateTime
*/
public function current() {
if (!$this->valid()) return null;
return clone $this->currentDate;
}
/**
* This method returns the startdate for the current iteration of the
* event.
*
* @return DateTime
*/
public function getDtStart() {
if (!$this->valid()) return null;
return clone $this->currentDate;
}
/**
* This method returns the enddate for the current iteration of the
* event.
*
* @return DateTime
*/
public function getDtEnd() {
if (!$this->valid()) return null;
$dtEnd = clone $this->currentDate;
$dtEnd->add( $this->startDate->diff( $this->endDate ) );
return clone $dtEnd;
}
/**
* Returns a VEVENT object with the updated start and end date.
*
* Any recurrence information is removed, and this function may return an
* 'overridden' event instead.
*
* This method always returns a cloned instance.
*
* @return Sabre_VObject_Component_VEvent
*/
public function getEventObject() {
if ($this->currentOverriddenEvent) {
return clone $this->currentOverriddenEvent;
}
$event = clone $this->baseEvent;
unset($event->RRULE);
unset($event->EXDATE);
unset($event->RDATE);
unset($event->EXRULE);
$event->DTSTART->setDateTime($this->getDTStart(), $event->DTSTART->getDateType());
if (isset($event->DTEND)) {
$event->DTEND->setDateTime($this->getDtEnd(), $event->DTSTART->getDateType());
}
if ($this->counter > 0) {
$event->{'RECURRENCE-ID'} = (string)$event->DTSTART;
}
return $event;
}
/**
* Returns the current item number
*
* @return int
*/
public function key() {
return $this->counter;
}
/**
* Whether or not there is a 'next item'
*
* @return bool
*/
public function valid() {
if (!is_null($this->count)) {
return $this->counter < $this->count;
}
if (!is_null($this->until)) {
return $this->currentDate <= $this->until;
}
return true;
}
/**
* Resets the iterator
*
* @return void
*/
public function rewind() {
$this->currentDate = clone $this->startDate;
$this->counter = 0;
}
/**
* This method allows you to quickly go to the next occurrence after the
* specified date.
*
* Note that this checks the current 'endDate', not the 'stardDate'. This
* means that if you forward to January 1st, the iterator will stop at the
* first event that ends *after* January 1st.
*
* @param DateTime $dt
* @return void
*/
public function fastForward(DateTime $dt) {
while($this->valid() && $this->getDTEnd() < $dt) {
$this->next();
}
}
/**
* Returns true if this recurring event never ends.
*
* @return bool
*/
public function isInfinite() {
return !$this->count && !$this->until;
}
/**
* Goes on to the next iteration
*
* @return void
*/
public function next() {
/*
if (!is_null($this->count) && $this->counter >= $this->count) {
$this->currentDate = null;
}*/
$previousStamp = $this->currentDate->getTimeStamp();
while(true) {
$this->currentOverriddenEvent = null;
// If we have a next date 'stored', we use that
if ($this->nextDate) {
$this->currentDate = $this->nextDate;
$currentStamp = $this->currentDate->getTimeStamp();
$this->nextDate = null;
} else {
// Otherwise, we calculate it
switch($this->frequency) {
case 'daily' :
$this->nextDaily();
break;
case 'weekly' :
$this->nextWeekly();
break;
case 'monthly' :
$this->nextMonthly();
break;
case 'yearly' :
$this->nextYearly();
break;
}
$currentStamp = $this->currentDate->getTimeStamp();
// Checking exception dates
foreach($this->exceptionDates as $exceptionDate) {
if ($this->currentDate == $exceptionDate) {
$this->counter++;
continue 2;
}
}
foreach($this->overriddenDates as $overriddenDate) {
if ($this->currentDate == $overriddenDate) {
continue 2;
}
}
}
// Checking overridden events
foreach($this->overriddenEvents as $index=>$event) {
if ($index > $previousStamp && $index <= $currentStamp) {
// We're moving the 'next date' aside, for later use.
$this->nextDate = clone $this->currentDate;
$this->currentDate = $event->DTSTART->getDateTime();
$this->currentOverriddenEvent = $event;
break;
}
}
break;
}
/*
if (!is_null($this->until)) {
if($this->currentDate > $this->until) {
$this->currentDate = null;
}
}*/
$this->counter++;
}
/**
* Does the processing for advancing the iterator for daily frequency.
*
* @return void
*/
protected function nextDaily() {
if (!$this->byDay) {
$this->currentDate->modify('+' . $this->interval . ' days');
return;
}
$recurrenceDays = array();
foreach($this->byDay as $byDay) {
// The day may be preceeded with a positive (+n) or
// negative (-n) integer. However, this does not make
// sense in 'weekly' so we ignore it here.
$recurrenceDays[] = $this->dayMap[substr($byDay,-2)];
}
do {
$this->currentDate->modify('+' . $this->interval . ' days');
// Current day of the week
$currentDay = $this->currentDate->format('w');
} while (!in_array($currentDay, $recurrenceDays));
}
/**
* Does the processing for advancing the iterator for weekly frequency.
*
* @return void
*/
protected function nextWeekly() {
if (!$this->byDay) {
$this->currentDate->modify('+' . $this->interval . ' weeks');
return;
}
$recurrenceDays = array();
foreach($this->byDay as $byDay) {
// The day may be preceeded with a positive (+n) or
// negative (-n) integer. However, this does not make
// sense in 'weekly' so we ignore it here.
$recurrenceDays[] = $this->dayMap[substr($byDay,-2)];
}
// Current day of the week
$currentDay = $this->currentDate->format('w');
// First day of the week:
$firstDay = $this->dayMap[$this->weekStart];
$time = array(
$this->currentDate->format('H'),
$this->currentDate->format('i'),
$this->currentDate->format('s')
);
// Increasing the 'current day' until we find our next
// occurrence.
while(true) {
$currentDay++;
if ($currentDay>6) {
$currentDay = 0;
}
// We need to roll over to the next week
if ($currentDay === $firstDay) {
$this->currentDate->modify('+' . $this->interval . ' weeks');
// We need to go to the first day of this week, but only if we
// are not already on this first day of this week.
if($this->currentDate->format('w') != $firstDay) {
$this->currentDate->modify('last ' . $this->dayNames[$this->dayMap[$this->weekStart]]);
$this->currentDate->setTime($time[0],$time[1],$time[2]);
}
}
// We have a match
if (in_array($currentDay ,$recurrenceDays)) {
$this->currentDate->modify($this->dayNames[$currentDay]);
$this->currentDate->setTime($time[0],$time[1],$time[2]);
break;
}
}
}
/**
* Does the processing for advancing the iterator for monthly frequency.
*
* @return void
*/
protected function nextMonthly() {
$currentDayOfMonth = $this->currentDate->format('j');
if (!$this->byMonthDay && !$this->byDay) {
// If the current day is higher than the 28th, rollover can
// occur to the next month. We Must skip these invalid
// entries.
if ($currentDayOfMonth < 29) {
$this->currentDate->modify('+' . $this->interval . ' months');
} else {
$increase = 0;
do {
$increase++;
$tempDate = clone $this->currentDate;
$tempDate->modify('+ ' . ($this->interval*$increase) . ' months');
} while ($tempDate->format('j') != $currentDayOfMonth);
$this->currentDate = $tempDate;
}
return;
}
while(true) {
$occurrences = $this->getMonthlyOccurrences();
foreach($occurrences as $occurrence) {
// The first occurrence thats higher than the current
// day of the month wins.
if ($occurrence > $currentDayOfMonth) {
break 2;
}
}
// If we made it all the way here, it means there were no
// valid occurrences, and we need to advance to the next
// month.
$this->currentDate->modify('first day of this month');
$this->currentDate->modify('+ ' . $this->interval . ' months');
// This goes to 0 because we need to start counting at hte
// beginning.
$currentDayOfMonth = 0;
}
$this->currentDate->setDate($this->currentDate->format('Y'), $this->currentDate->format('n'), $occurrence);
}
/**
* Does the processing for advancing the iterator for yearly frequency.
*
* @return void
*/
protected function nextYearly() {
if (!$this->byMonth) {
$this->currentDate->modify('+' . $this->interval . ' years');
return;
}
$currentMonth = $this->currentDate->format('n');
$currentYear = $this->currentDate->format('Y');
$currentDayOfMonth = $this->currentDate->format('j');
$advancedToNewMonth = false;
// If we got a byDay or getMonthDay filter, we must first expand
// further.
if ($this->byDay || $this->byMonthDay) {
while(true) {
$occurrences = $this->getMonthlyOccurrences();
foreach($occurrences as $occurrence) {
// The first occurrence that's higher than the current
// day of the month wins.
// If we advanced to the next month or year, the first
// occurrence is always correct.
if ($occurrence > $currentDayOfMonth || $advancedToNewMonth) {
break 2;
}
}
// If we made it here, it means we need to advance to
// the next month or year.
$currentDayOfMonth = 1;
$advancedToNewMonth = true;
do {
$currentMonth++;
if ($currentMonth>12) {
$currentYear+=$this->interval;
$currentMonth = 1;
}
} while (!in_array($currentMonth, $this->byMonth));
$this->currentDate->setDate($currentYear, $currentMonth, $currentDayOfMonth);
}
// If we made it here, it means we got a valid occurrence
$this->currentDate->setDate($currentYear, $currentMonth, $occurrence);
return;
} else {
// no byDay or byMonthDay, so we can just loop through the
// months.
do {
$currentMonth++;
if ($currentMonth>12) {
$currentYear+=$this->interval;
$currentMonth = 1;
}
} while (!in_array($currentMonth, $this->byMonth));
$this->currentDate->setDate($currentYear, $currentMonth, $currentDayOfMonth);
return;
}
}
/**
* Returns all the occurrences for a monthly frequency with a 'byDay' or
* 'byMonthDay' expansion for the current month.
*
* The returned list is an array of integers with the day of month (1-31).
*
* @return array
*/
protected function getMonthlyOccurrences() {
$startDate = clone $this->currentDate;
$byDayResults = array();
// Our strategy is to simply go through the byDays, advance the date to
// that point and add it to the results.
if ($this->byDay) foreach($this->byDay as $day) {
$dayName = $this->dayNames[$this->dayMap[substr($day,-2)]];
// Dayname will be something like 'wednesday'. Now we need to find
// all wednesdays in this month.
$dayHits = array();
$checkDate = clone $startDate;
$checkDate->modify('first day of this month');
$checkDate->modify($dayName);
do {
$dayHits[] = $checkDate->format('j');
$checkDate->modify('next ' . $dayName);
} while ($checkDate->format('n') === $startDate->format('n'));
// So now we have 'all wednesdays' for month. It is however
// possible that the user only really wanted the 1st, 2nd or last
// wednesday.
if (strlen($day)>2) {
$offset = (int)substr($day,0,-2);
if ($offset>0) {
// It is possible that the day does not exist, such as a
// 5th or 6th wednesday of the month.
if (isset($dayHits[$offset-1])) {
$byDayResults[] = $dayHits[$offset-1];
}
} else {
// if it was negative we count from the end of the array
$byDayResults[] = $dayHits[count($dayHits) + $offset];
}
} else {
// There was no counter (first, second, last wednesdays), so we
// just need to add the all to the list).
$byDayResults = array_merge($byDayResults, $dayHits);
}
}
$byMonthDayResults = array();
if ($this->byMonthDay) foreach($this->byMonthDay as $monthDay) {
// Removing values that are out of range for this month
if ($monthDay > $startDate->format('t') ||
$monthDay < 0-$startDate->format('t')) {
continue;
}
if ($monthDay>0) {
$byMonthDayResults[] = $monthDay;
} else {
// Negative values
$byMonthDayResults[] = $startDate->format('t') + 1 + $monthDay;
}
}
// If there was just byDay or just byMonthDay, they just specify our
// (almost) final list. If both were provided, then byDay limits the
// list.
if ($this->byMonthDay && $this->byDay) {
$result = array_intersect($byMonthDayResults, $byDayResults);
} elseif ($this->byMonthDay) {
$result = $byMonthDayResults;
} else {
$result = $byDayResults;
}
$result = array_unique($result);
sort($result, SORT_NUMERIC);
// The last thing that needs checking is the BYSETPOS. If it's set, it
// means only certain items in the set survive the filter.
if (!$this->bySetPos) {
return $result;
}
$filteredResult = array();
foreach($this->bySetPos as $setPos) {
if ($setPos<0) {
$setPos = count($result)-($setPos+1);
}
if (isset($result[$setPos-1])) {
$filteredResult[] = $result[$setPos-1];
}
}
sort($filteredResult, SORT_NUMERIC);
return $filteredResult;
}
}
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