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davical/inc/RRule-v2.php
Andrew McMillan 844b7b2e94 Handle stuff like DTSTART;TZID=America/New_York:20101119T231307 
Thanks to Matthias Althaus for pointing out that while the class
attempts to handle this kind of thing, it doesn't actually work.
2010-11-19 23:13:30 +13:00

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<?php
/**
* Class for parsing RRule and getting us the dates
*
* @package awl
* @subpackage caldav
* @author Andrew McMillan <andrew@mcmillan.net.nz>
* @copyright Morphoss Ltd
* @license http://gnu.org/copyleft/gpl.html GNU GPL v2 or later
*/
if ( !class_exists('DateTime') ) return;
$rrule_expand_limit = array(
'YEARLY' => array( 'bymonth' => 'expand', 'byweekno' => 'expand', 'byyearday' => 'expand', 'bymonthday' => 'expand',
'byday' => 'expand', 'byhour' => 'expand', 'byminute' => 'expand', 'bysecond' => 'expand' ),
'MONTHLY' => array( 'bymonth' => 'limit', 'bymonthday' => 'expand',
'byday' => 'expand', 'byhour' => 'expand', 'byminute' => 'expand', 'bysecond' => 'expand' ),
'WEEKLY' => array( 'bymonth' => 'limit',
'byday' => 'expand', 'byhour' => 'expand', 'byminute' => 'expand', 'bysecond' => 'expand' ),
'DAILY' => array( 'bymonth' => 'limit', 'bymonthday' => 'limit',
'byday' => 'limit', 'byhour' => 'expand', 'byminute' => 'expand', 'bysecond' => 'expand' ),
'HOURLY' => array( 'bymonth' => 'limit', 'bymonthday' => 'limit',
'byday' => 'limit', 'byhour' => 'limit', 'byminute' => 'expand', 'bysecond' => 'expand' ),
'MINUTELY'=> array( 'bymonth' => 'limit', 'bymonthday' => 'limit',
'byday' => 'limit', 'byhour' => 'limit', 'byminute' => 'limit', 'bysecond' => 'expand' ),
'SECONDLY'=> array( 'bymonth' => 'limit', 'bymonthday' => 'limit',
'byday' => 'limit', 'byhour' => 'limit', 'byminute' => 'limit', 'bysecond' => 'limit' ),
);
$rrule_day_numbers = array( 'SU' => 0, 'MO' => 1, 'TU' => 2, 'WE' => 3, 'TH' => 4, 'FR' => 5, 'SA' => 6 );
$GLOBALS['debug_rrule'] = false;
// $GLOBALS['debug_rrule'] = true;
/**
* Wrap the DateTimeZone class to allow parsing some iCalendar TZID strangenesses
*/
class RepeatRuleTimeZone extends DateTimeZone {
private $tz_defined;
public function __construct($in_dtz = null) {
$this->tz_defined = false;
if ( !isset($in_dtz) ) return;
$olson = olson_from_tzstring($in_dtz);
if ( isset($olson) ) {
try {
parent::__construct($olson);
$this->tz_defined = $olson;
}
catch (Exception $e) {
dbg_error_log( 'ERROR', 'Could not handle timezone "%s" (%s) - will use floating time', $in_dtz, $olson );
parent::__construct('UTC');
$this->tz_defined = false;
}
}
else {
dbg_error_log( 'ERROR', 'Could not recognize timezone "%s" - will use floating time', $in_dtz );
parent::__construct('UTC');
$this->tz_defined = false;
}
}
function tzid() {
if ( $this->tz_defined === false ) return false;
$tzid = $this->getName();
if ( $tzid != 'UTC' ) return $tzid;
return $this->tz_defined;
}
}
/**
* Wrap the DateTime class to make it friendlier to passing in random strings from iCalendar
* objects, and especially the random stuff used to identify timezones. We also add some
* utility methods and stuff too, in order to simplify some of the operations we need to do
* with dates.
*/
class RepeatRuleDateTime extends DateTime {
// public static $Format = 'Y-m-d H:i:s';
public static $Format = 'c';
private $tzid;
private $is_date;
public function __construct($date = null, $dtz = null) {
$this->is_date = false;
if ( !isset($date) ) return;
if ( preg_match('{;?VALUE=DATE[:;]}', $date, $matches) ) $this->is_date = true;
elseif ( preg_match('{:([12]\d{3}) (0[1-9]|1[012]) (0[1-9]|[12]\d|3[01]Z?) $}x', $date, $matches) ) $this->is_date = true;
if (preg_match('/;?TZID=([^:]+).*:(\d{8}(T\d{6})?)(Z)?/', $date, $matches) ) {
$date = $matches[2];
if ( isset($matches[4]) && $matches[4] == 'Z' ) {
$dtz = new RepeatRuleTimeZone('UTC');
$this->tzid = 'UTC';
}
else if ( isset($matches[1]) && $matches[1] != '' ) {
$dtz = new RepeatRuleTimeZone($matches[1]);
$this->tzid = $dtz->tzid();
}
else {
$dtz = new RepeatRuleTimeZone('UTC');
$this->tzid = null;
}
}
elseif( $dtz === null || $dtz == '' ) {
$dtz = new RepeatRuleTimeZone('UTC');
if ( preg_match('/(\d{8}(T\d{6})?)Z/', $date, $matches) ) {
if ( strlen($matches[1]) == 8 ) $this->is_date = true;
$this->tzid = 'UTC';
}
else {
$this->tzid = null;
}
}
elseif ( is_string($dtz) ) {
$dtz = new RepeatRuleTimeZone($dtz);
$this->tzid = $dtz->tzid();
}
else {
$this->tzid = $dtz->getName();
}
parent::__construct($date, $dtz);
return $this;
}
public function __toString() {
return (string)parent::format(self::$Format) . ' ' . parent::getTimeZone()->getName();
}
public function AsDate() {
return $this->format('Ymd');
}
public function modify( $interval ) {
if ( preg_match('{^(-)?P(([0-9-]+)W)?(([0-9-]+)D)?T?(([0-9-]+)H)?(([0-9-]+)M)?(([0-9-]+)S)?$}', $interval, $matches) ) {
$minus = $matches[1];
$interval = '';
if ( isset($matches[2]) && $matches[2] != '' ) $interval .= $minus . $matches[3] . ' weeks ';
if ( isset($matches[4]) && $matches[4] != '' ) $interval .= $minus . $matches[5] . ' days ';
if ( isset($matches[6]) && $matches[6] != '' ) $interval .= $minus . $matches[7] . ' hours ';
if ( isset($matches[8]) && $matches[8] != '' ) $interval .= $minus . $matches[9] . ' minutes ';
if (isset($matches[10]) &&$matches[10] != '' ) $interval .= $minus . $matches[11] . ' seconds ';
}
// printf( "Modify '%s' by: >>%s<<\n", $this->__toString(), $interval );
// print_r($this);
if ( !isset($interval) || $interval == '' ) $interval = '1 day';
parent::modify($interval);
return $this->__toString();
}
public function UTC() {
$gmt = clone($this);
if ( isset($this->tzid) && $this->tzid != 'UTC' ) {
$dtz = parent::getTimezone();
$offset = 0 - $dtz->getOffset($gmt);
$gmt->modify( $offset . ' seconds' );
}
if ( $this->is_date ) return $gmt->format('Ymd');
return $gmt->format('Ymd\THis\Z');
}
public function RFC5545() {
$result = '';
if ( isset($this->tzid) && $this->tzid != 'UTC' ) {
$result = ';TZID='.$this->tzid;
}
if ( $this->is_date ) {
$result .= ';VALUE=DATE:' . $this->format('Ymd');
}
else {
$result .= ':' . $this->format('Ymd\THis');
if ( isset($this->tzid) && $this->tzid == 'UTC' ) {
$result .= 'Z';
}
}
return $result;
}
public function RFC5545Duration( $end_stamp ) {
return sprintf( 'PT%dM', intval(($end_stamp->epoch() - $this->epoch()) / 60) );
}
public function setTimeZone( $tz ) {
if ( is_string($tz) ) {
$tz = new RepeatRuleTimeZone($tz);
$this->tzid = $tz->tzid();
}
parent::setTimeZone( $tz );
return $this;
}
function setDate( $year=null, $month=null, $day=null ) {
if ( !isset($year) ) $year = parent::format('Y');
if ( !isset($month) ) $month = parent::format('m');
if ( !isset($day) ) $day = parent::format('d');
parent::setDate( $year , $month , $day );
return $this;
}
function year() {
return parent::format('Y');
}
function month() {
return parent::format('m');
}
function day() {
return parent::format('d');
}
function hour() {
return parent::format('H');
}
function minute() {
return parent::format('i');
}
function second() {
return parent::format('s');
}
function epoch() {
return parent::format('U');
}
}
class RepeatRule {
private $base;
private $until;
private $freq;
private $count;
private $interval;
private $bysecond;
private $byminute;
private $byhour;
private $bymonthday;
private $byyearday;
private $byweekno;
private $byday;
private $bymonth;
private $bysetpos;
private $wkst;
private $instances;
private $position;
private $finished;
private $current_base;
public function __construct( $basedate, $rrule ) {
$this->base = ( is_object($basedate) ? $basedate : new RepeatRuleDateTime($basedate) );
if ( $GLOBALS['debug_rrule'] ) {
printf( "Constructing RRULE based on: '%s', rrule: '%s'\n", $basedate, $rrule );
}
if ( preg_match('{FREQ=([A-Z]+)(;|$)}', $rrule, $m) ) $this->freq = $m[1];
if ( preg_match('{UNTIL=([0-9TZ]+)(;|$)}', $rrule, $m) ) $this->until = new RepeatRuleDateTime($m[1]);
if ( preg_match('{COUNT=([0-9]+)(;|$)}', $rrule, $m) ) $this->count = $m[1];
if ( preg_match('{INTERVAL=([0-9]+)(;|$)}', $rrule, $m) ) $this->interval = $m[1];
if ( preg_match('{WKST=(MO|TU|WE|TH|FR|SA|SU)(;|$)}', $rrule, $m) ) $this->wkst = $m[1];
if ( preg_match('{BYDAY=(([+-]?[0-9]{0,2}(MO|TU|WE|TH|FR|SA|SU),?)+)(;|$)}', $rrule, $m) ) $this->byday = explode(',',$m[1]);
if ( preg_match('{BYYEARDAY=([0-9,+-]+)(;|$)}', $rrule, $m) ) $this->byyearday = explode(',',$m[1]);
if ( preg_match('{BYWEEKNO=([0-9,+-]+)(;|$)}', $rrule, $m) ) $this->byweekno = explode(',',$m[1]);
if ( preg_match('{BYMONTHDAY=([0-9,+-]+)(;|$)}', $rrule, $m) ) $this->bymonthday = explode(',',$m[1]);
if ( preg_match('{BYMONTH=(([+-]?[0-1]?[0-9],?)+)(;|$)}', $rrule, $m) ) $this->bymonth = explode(',',$m[1]);
if ( preg_match('{BYSETPOS=(([+-]?[0-9]{1,3},?)+)(;|$)}', $rrule, $m) ) $this->bysetpos = explode(',',$m[1]);
if ( preg_match('{BYSECOND=([0-9,]+)(;|$)}', $rrule, $m) ) $this->bysecond = explode(',',$m[1]);
if ( preg_match('{BYMINUTE=([0-9,]+)(;|$)}', $rrule, $m) ) $this->byminute = explode(',',$m[1]);
if ( preg_match('{BYHOUR=([0-9,]+)(;|$)}', $rrule, $m) ) $this->byhour = explode(',',$m[1]);
if ( !isset($this->interval) ) $this->interval = 1;
switch( $this->freq ) {
case 'SECONDLY': $this->freq_name = 'second'; break;
case 'MINUTELY': $this->freq_name = 'minute'; break;
case 'HOURLY': $this->freq_name = 'hour'; break;
case 'DAILY': $this->freq_name = 'day'; break;
case 'WEEKLY': $this->freq_name = 'week'; break;
case 'MONTHLY': $this->freq_name = 'month'; break;
case 'YEARLY': $this->freq_name = 'year'; break;
default:
/** need to handle the error, but FREQ is mandatory so unlikely */
}
$this->frequency_string = sprintf('+%d %s', $this->interval, $this->freq_name );
if ( $GLOBALS['debug_rrule'] ) printf( "Frequency modify string is: '%s', base is: '%s'\n", $this->frequency_string, $this->base->format('c') );
$this->Start();
}
public function set_timezone( $tzstring ) {
$this->base->setTimezone(new DateTimeZone($tzstring));
}
public function Start() {
$this->instances = array();
$this->GetMoreInstances();
$this->rewind();
$this->finished = false;
}
public function rewind() {
$this->position = -1;
}
public function next() {
$this->position++;
return $this->current();
}
public function current() {
if ( !$this->valid() ) return null;
if ( !isset($this->instances[$this->position]) ) $this->GetMoreInstances();
if ( !$this->valid() ) return null;
if ( $GLOBALS['debug_rrule'] ) printf( "Returning date from position %d: %s (%s)\n", $this->position, $this->instances[$this->position]->format('c'), $this->instances[$this->position]->UTC() );
return $this->instances[$this->position];
}
public function key() {
if ( !$this->valid() ) return null;
if ( !isset($this->instances[$this->position]) ) $this->GetMoreInstances();
if ( !isset($this->keys[$this->position]) ) {
$this->keys[$this->position] = $this->instances[$this->position];
}
return $this->keys[$this->position];
}
public function valid() {
if ( isset($this->instances[$this->position]) || !$this->finished ) return true;
return false;
}
private function GetMoreInstances() {
global $rrule_expand_limit;
if ( $this->finished ) return;
$got_more = false;
$loop_limit = 10;
$loops = 0;
while( !$this->finished && !$got_more && $loops++ < $loop_limit ) {
if ( !isset($this->current_base) ) {
$this->current_base = clone($this->base);
}
else {
$this->current_base->modify( $this->frequency_string );
}
if ( $GLOBALS['debug_rrule'] ) printf( "Getting more instances from: '%s' - %d\n", $this->current_base->format('c'), count($this->instances) );
$this->current_set = array( clone($this->current_base) );
foreach( $rrule_expand_limit[$this->freq] AS $bytype => $action ) {
if ( isset($this->{$bytype}) ) $this->{$action.'_'.$bytype}();
if ( !isset($this->current_set[0]) ) break;
}
sort($this->current_set);
if ( isset($this->bysetpos) ) $this->limit_bysetpos();
$position = count($this->instances) - 1;
if ( $GLOBALS['debug_rrule'] ) printf( "Inserting %d from current_set into position %d\n", count($this->current_set), $position + 1 );
foreach( $this->current_set AS $k => $instance ) {
if ( $instance < $this->base ) continue;
if ( isset($this->until) && $instance > $this->until ) {
$this->finished = true;
return;
}
if ( !isset($this->instances[$position]) || $instance != $this->instances[$position] ) {
$got_more = true;
$position++;
$this->instances[$position] = $instance;
if ( $GLOBALS['debug_rrule'] ) printf( "Added date %s into position %d in current set\n", $instance->format('c'), $position );
if ( isset($this->count) && ($position + 1) >= $this->count ) $this->finished = true;
}
}
}
}
static public function date_mask( $date, $y, $mo, $d, $h, $mi, $s ) {
$date_parts = explode(',',$date->format('Y,m,d,H,i,s'));
$tz = $date->getTimezone();
if ( isset($y) || isset($mo) || isset($d) ) {
if ( isset($y) ) $date_parts[0] = $y;
if ( isset($mo) ) $date_parts[1] = $mo;
if ( isset($d) ) $date_parts[2] = $d;
$date->setDate( $date_parts[0], $date_parts[1], $date_parts[2] );
}
if ( isset($h) || isset($mi) || isset($s) ) {
if ( isset($h) ) $date_parts[3] = $h;
if ( isset($mi) ) $date_parts[4] = $mi;
if ( isset($s) ) $date_parts[5] = $s;
$date->setTime( $date_parts[3], $date_parts[4], $date_parts[5] );
}
return $date;
}
private function expand_bymonth() {
$instances = $this->current_set;
$this->current_set = array();
foreach( $instances AS $k => $instance ) {
foreach( $this->bymonth AS $k => $month ) {
$expanded = $this->date_mask( clone($instance), null, $month, null, null, null, null);
if ( $GLOBALS['debug_rrule'] ) printf( "Expanded BYMONTH $month into date %s\n", $expanded->format('c') );
$this->current_set[] = $expanded;
}
}
}
private function expand_bymonthday() {
$instances = $this->current_set;
$this->current_set = array();
foreach( $instances AS $k => $instance ) {
foreach( $this->bymonthday AS $k => $monthday ) {
$this->current_set[] = $this->date_mask( clone($instance), null, null, $monthday, null, null, null);
}
}
}
private function expand_byday_in_week( $day_in_week ) {
global $rrule_day_numbers;
/**
* @TODO: This should really allow for WKST, since if we start a series
* on (eg.) TH and interval > 1, a MO, TU, FR repeat will not be in the
* same week with this code.
*/
$dow_of_instance = $day_in_week->format('w'); // 0 == Sunday
foreach( $this->byday AS $k => $weekday ) {
$dow = $rrule_day_numbers[$weekday];
$offset = $dow - $dow_of_instance;
if ( $offset < 0 ) $offset += 7;
$expanded = clone($day_in_week);
$expanded->modify( sprintf('+%d day', $offset) );
$this->current_set[] = $expanded;
if ( $GLOBALS['debug_rrule'] ) printf( "Expanded BYDAY(W) $weekday into date %s\n", $expanded->format('c') );
}
}
private function expand_byday_in_month( $day_in_month ) {
global $rrule_day_numbers;
$first_of_month = $this->date_mask( clone($day_in_month), null, null, 1, null, null, null);
$dow_of_first = $first_of_month->format('w'); // 0 == Sunday
$days_in_month = cal_days_in_month(CAL_GREGORIAN, $first_of_month->format('m'), $first_of_month->format('Y'));
foreach( $this->byday AS $k => $weekday ) {
if ( preg_match('{([+-])?(\d)?(MO|TU|WE|TH|FR|SA|SU)}', $weekday, $matches ) ) {
$dow = $rrule_day_numbers[$matches[3]];
$first_dom = 1 + $dow - $dow_of_first; if ( $first_dom < 1 ) $first_dom +=7; // e.g. 1st=WE, dow=MO => 1+1-3=-1 => MO is 6th, etc.
$whichweek = intval($matches[2]);
if ( $GLOBALS['debug_rrule'] ) printf( "Expanding BYDAY(M) $weekday in month of %s\n", $instance->format('c') );
if ( $whichweek > 0 ) {
$whichweek--;
$monthday = $first_dom;
if ( $matches[1] == '-' ) {
$monthday += 35;
while( $monthday > $days_in_month ) $monthday -= 7;
$monthday -= (7 * $whichweek);
}
else {
$monthday += (7 * $whichweek);
}
if ( $monthday > 0 && $monthday <= $days_in_month ) {
$expanded = $this->date_mask( clone($day_in_month), null, null, $monthday, null, null, null);
if ( $GLOBALS['debug_rrule'] ) printf( "Expanded BYDAY(M) $weekday now $monthday into date %s\n", $expanded->format('c') );
$this->current_set[] = $expanded;
}
}
else {
for( $monthday = $first_dom; $monthday <= $days_in_month; $monthday += 7 ) {
$expanded = $this->date_mask( clone($day_in_month), null, null, $monthday, null, null, null);
if ( $GLOBALS['debug_rrule'] ) printf( "Expanded BYDAY(M) $weekday now $monthday into date %s\n", $expanded->format('c') );
$this->current_set[] = $expanded;
}
}
}
}
}
private function expand_byday_in_year( $day_in_year ) {
global $rrule_day_numbers;
$first_of_year = $this->date_mask( clone($day_in_year), null, 1, 1, null, null, null);
$dow_of_first = $first_of_year->format('w'); // 0 == Sunday
$days_in_year = 337 + cal_days_in_month(CAL_GREGORIAN, 2, $first_of_year->format('Y'));
foreach( $this->byday AS $k => $weekday ) {
if ( preg_match('{([+-])?(\d)?(MO|TU|WE|TH|FR|SA|SU)}', $weekday, $matches ) ) {
$expanded = clone($first_of_year);
$dow = $rrule_day_numbers[$matches[3]];
$first_doy = 1 + $dow - $dow_of_first; if ( $first_doy < 1 ) $first_doy +=7; // e.g. 1st=WE, dow=MO => 1+1-3=-1 => MO is 6th, etc.
$whichweek = intval($matches[2]);
if ( $GLOBALS['debug_rrule'] ) printf( "Expanding BYDAY(Y) $weekday from date %s\n", $instance->format('c') );
if ( $whichweek > 0 ) {
$whichweek--;
$yearday = $first_doy;
if ( $matches[1] == '-' ) {
$yearday += 371;
while( $yearday > $days_in_year ) $yearday -= 7;
$yearday -= (7 * $whichweek);
}
else {
$yearday += (7 * $whichweek);
}
if ( $yearday > 0 && $yearday <= $days_in_year ) {
$expanded->modify(sprintf('+%d day', $yearday - 1));
if ( $GLOBALS['debug_rrule'] ) printf( "Expanded BYDAY(Y) $weekday now $yearday into date %s\n", $expanded->format('c') );
$this->current_set[] = $expanded;
}
}
else {
$expanded->modify(sprintf('+%d day', $first_doy - 1));
for( $yearday = $first_doy; $yearday <= $days_in_year; $yearday += 7 ) {
if ( $GLOBALS['debug_rrule'] ) printf( "Expanded BYDAY(Y) $weekday now $yearday into date %s\n", $expanded->format('c') );
$this->current_set[] = clone($expanded);
$expanded->modify('+1 week');
}
}
}
}
}
private function expand_byday() {
if ( !isset($this->current_set[0]) ) return;
if ( $this->freq == 'MONTHLY' || $this->freq == 'YEARLY' ) {
if ( isset($this->bymonthday) || isset($this->byyearday) ) {
$this->limit_byday(); /** Per RFC5545 3.3.10 from note 1&2 to table */
return;
}
}
$instances = $this->current_set;
$this->current_set = array();
foreach( $instances AS $k => $instance ) {
if ( $this->freq == 'MONTHLY' ) {
$this->expand_byday_in_month($instance);
}
else if ( $this->freq == 'WEEKLY' ) {
$this->expand_byday_in_week($instance);
}
else { // YEARLY
if ( isset($this->bymonth) ) {
$this->expand_byday_in_month($instance);
}
else if ( isset($this->byweekno) ) {
$this->expand_byday_in_week($instance);
}
else {
$this->expand_byday_in_year($instance);
}
}
}
}
private function expand_byhour() {
$instances = $this->current_set;
$this->current_set = array();
foreach( $instances AS $k => $instance ) {
foreach( $this->bymonth AS $k => $month ) {
$this->current_set[] = $this->date_mask( clone($instance), null, null, null, $hour, null, null);
}
}
}
private function expand_byminute() {
$instances = $this->current_set;
$this->current_set = array();
foreach( $instances AS $k => $instance ) {
foreach( $this->bymonth AS $k => $month ) {
$this->current_set[] = $this->date_mask( clone($instance), null, null, null, null, $minute, null);
}
}
}
private function expand_bysecond() {
$instances = $this->current_set;
$this->current_set = array();
foreach( $instances AS $k => $instance ) {
foreach( $this->bymonth AS $k => $second ) {
$this->current_set[] = $this->date_mask( clone($instance), null, null, null, null, null, $second);
}
}
}
private function limit_generally( $fmt_char, $element_name ) {
$instances = $this->current_set;
$this->current_set = array();
foreach( $instances AS $k => $instance ) {
foreach( $this->{$element_name} AS $k => $element_value ) {
if ( $GLOBALS['debug_rrule'] ) printf( "Limiting '$fmt_char' on '%s' => '%s' ?=? '%s' ? %s\n", $instance->format('c'), $instance->format($fmt_char), $element_value, ($instance->format($fmt_char) == $element_value ? 'Yes' : 'No') );
if ( $instance->format($fmt_char) == $element_value ) $this->current_set[] = $instance;
}
}
}
private function limit_byday() {
global $rrule_day_numbers;
$fmt_char = 'w';
$instances = $this->current_set;
$this->current_set = array();
foreach( $this->byday AS $k => $weekday ) {
$dow = $rrule_day_numbers[$weekday];
foreach( $instances AS $k => $instance ) {
if ( $GLOBALS['debug_rrule'] ) printf( "Limiting '$fmt_char' on '%s' => '%s' ?=? '%s' (%d) ? %s\n", $instance->format('c'), $instance->format($fmt_char), $weekday, $dow, ($instance->format($fmt_char) == $dow ? 'Yes' : 'No') );
if ( $instance->format($fmt_char) == $dow ) $this->current_set[] = $instance;
}
}
}
private function limit_bymonth() { $this->limit_generally( 'm', 'bymonth' ); }
private function limit_byyearday() { $this->limit_generally( 'z', 'byyearday' ); }
private function limit_bymonthday() { $this->limit_generally( 'd', 'bymonthday' ); }
private function limit_byhour() { $this->limit_generally( 'H', 'byhour' ); }
private function limit_byminute() { $this->limit_generally( 'i', 'byminute' ); }
private function limit_bysecond() { $this->limit_generally( 's', 'bysecond' ); }
private function limit_bysetpos( ) {
$instances = $this->current_set;
$count = count($instances);
$this->current_set = array();
foreach( $this->bysetpos AS $k => $element_value ) {
if ( $GLOBALS['debug_rrule'] ) printf( "Limiting bysetpos %s of %d instances\n", $element_value, $count );
if ( $element_value > 0 ) {
$this->current_set[] = $instances[$element_value - 1];
}
else if ( $element_value < 0 ) {
$this->current_set[] = $instances[$count + $element_value];
}
}
}
}
require_once("vComponent.php");
/**
* Expand the event instances for an RDATE or EXDATE property
*
* @param string $property RDATE or EXDATE, depending...
* @param array $component A vComponent which is a VEVENT, VTODO or VJOURNAL
* @param array $range_end A date after which we care less about expansion
*
* @return array An array keyed on the UTC dates, referring to the component
*/
function rdate_expand( $dtstart, $property, $component, $range_end = null ) {
$properties = $component->GetProperties($property);
$expansion = array();
foreach( $properties AS $p ) {
$timezone = $p->GetParameterValue('TZID');
$rdate = $p->Value();
$rdates = explode( ',', $rdate );
foreach( $rdates AS $k => $v ) {
$rdate = new RepeatRuleDateTime( $v, $timezone);
$expansion[$rdate->UTC()] = $component;
if ( $rdate > $range_end ) break;
}
}
return $expansion;
}
/**
* Expand the event instances for an RRULE property
*
* @param object $dtstart A RepeatRuleDateTime which is the master dtstart
* @param string $property RDATE or EXDATE, depending...
* @param array $component A vComponent which is a VEVENT, VTODO or VJOURNAL
* @param array $range_end A date after which we care less about expansion
*
* @return array An array keyed on the UTC dates, referring to the component
*/
function rrule_expand( $dtstart, $property, $component, $range_end ) {
$expansion = array();
$recur = $component->GetProperty($property);
if ( !isset($recur) ) return $expansion;
$recur = $recur->Value();
$this_start = $component->GetProperty('DTSTART');
if ( isset($this_start) ) {
$timezone = $this_start->GetParameterValue('TZID');
$this_start = new RepeatRuleDateTime($this_start->Value(),$timezone);
}
else {
$this_start = clone($dtstart);
}
// print_r( $this_start );
// printf( "RRULE: %s\n", $recur );
$rule = new RepeatRule( $this_start, $recur );
$i = 0;
$result_limit = 1000;
while( $date = $rule->next() ) {
// printf( "[%3d] %s\n", $i, $date->UTC() );
$expansion[$date->UTC()] = $component;
if ( $i++ >= $result_limit || $date > $range_end ) break;
}
// print_r( $expansion );
return $expansion;
}
/**
* Expand the event instances for an iCalendar VEVENT (or VTODO)
*
* Note: expansion here does not apply modifications to instances other than modifying start/end/due/duration.
*
* @param object $vResource A vComponent which is a VCALENDAR containing components needing expansion
* @param object $range_start A RepeatRuleDateTime which is the beginning of the range for events, default -6 weeks
* @param object $range_end A RepeatRuleDateTime which is the end of the range for events, default +6 weeks
*
* @return vComponent The original vComponent, with the instances of the internal components expanded.
*/
function expand_event_instances( $vResource, $range_start = null, $range_end = null ) {
$components = $vResource->GetComponents();
if ( !isset($range_start) ) { $range_start = new RepeatRuleDateTime(); $range_start->modify('-6 weeks'); }
if ( !isset($range_end) ) { $range_end = clone($range_start); $range_end->modify('+6 months'); }
$new_components = array();
$result_limit = 1000;
$instances = array();
$expand = false;
$dtstart = null;
foreach( $components AS $k => $comp ) {
if ( $comp->GetType() != 'VEVENT' && $comp->GetType() != 'VTODO' && $comp->GetType() != 'VJOURNAL' ) {
if ( $comp->GetType() != 'VTIMEZONE' ) $new_components[] = $comp;
continue;
}
if ( !isset($dtstart) ) {
$dtstart = $comp->GetProperty('DTSTART');
$tzid = $dtstart->GetParameterValue('TZID');
$dtstart = new RepeatRuleDateTime( $dtstart->Value(), $tzid );
$instances[$dtstart->UTC()] = $comp;
}
$p = $comp->GetProperty('RECURRENCE-ID');
if ( isset($p) && $p->Value() != '' ) {
$range = $p->GetParameterValue('RANGE');
$recur_tzid = $p->GetParameterValue('TZID');
$recur_utc = new RepeatRuleDateTime($p->Value(),$recur_tzid);
$recur_utc = $recur_utc->UTC();
if ( isset($range) && $range == 'THISANDFUTURE' ) {
foreach( $instances AS $k => $v ) {
if ( $k >= $recur_utc ) unset($instances[$k]);
}
}
else {
unset($instances[$recur_utc]);
}
}
$instances = array_merge( $instances, rrule_expand($dtstart, 'RRULE', $comp, $range_end) );
$instances = array_merge( $instances, rdate_expand($dtstart, 'RDATE', $comp, $range_end) );
foreach ( rdate_expand($dtstart, 'EXDATE', $comp, $range_end) AS $k => $v ) {
unset($instances[$k]);
}
}
$last_duration = null;
$early_start = null;
$new_components = array();
$start_utc = $range_start->UTC();
$end_utc = $range_end->UTC();
foreach( $instances AS $utc => $comp ) {
if ( $utc > $end_utc ) break;
$end_type = ($comp->GetType() == 'VTODO' ? 'DUE' : 'DTEND');
$duration = $comp->GetProperty('DURATION');
if ( !isset($duration) || $duration->Value() == '' ) {
$instance_start = $comp->GetProperty('DTSTART');
$dtsrt = new RepeatRuleDateTime( $instance_start->Value(), $instance_start->GetParameterValue('TZID'));
$instance_end = $comp->GetProperty($end_type);
if ( isset($instance_end) ) {
$dtend = new RepeatRuleDateTime( $instance_end->Value(), $instance_end->GetParameterValue('TZID'));
$duration = $dtstart->RFC5545Duration( $dtend );
}
else {
if ( $instance_start->GetParameterValue('VALUE') == 'DATE' ) {
$duration = 'P1D';
}
else {
$duration = 'P0D'; // For clarity
}
}
}
else {
$duration = $duration->Value();
}
if ( $utc < $start_utc ) {
if ( isset($early_start) && isset($last_duration) && $duration == $last_duration) {
if ( $utc < $early_start ) continue;
}
else {
/** Calculate the latest possible start date when this event would overlap our range start */
$latest_start = clone($range_start);
$latest_start->modify('-'.$duration);
$early_start = $latest_start->UTC();
$last_duration = $duration;
if ( $utc < $early_start ) continue;
}
}
$component = clone($comp);
$component->ClearProperties( array('DTSTART'=> true, 'DUE' => true, 'DTEND' => true) );
$component->AddProperty('DTSTART', $utc );
$component->AddProperty('DURATION', $duration );
$new_components[] = $component;
}
$vResource->SetComponents($new_components);
return $vResource;
}
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