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<?php
namespace Sabre\VObject;
/**
* DateTimeParser
*
* This class is responsible for parsing the several different date and time
* formats iCalendar and vCards have.
*
* @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 DateTimeParser {
/**
* Parses an iCalendar (rfc5545) formatted datetime and returns a DateTime object
*
* Specifying a reference timezone is optional. It will only be used
* if the non-UTC format is used. The argument is used as a reference, the
* returned DateTime object will still be in the UTC timezone.
*
* @param string $dt
* @param DateTimeZone $tz
* @return DateTime
*/
static public function parseDateTime($dt,\DateTimeZone $tz = null) {
// Format is YYYYMMDD + "T" + hhmmss
$result = preg_match('/^([1-4][0-9]{3})([0-1][0-9])([0-3][0-9])T([0-2][0-9])([0-5][0-9])([0-5][0-9])([Z]?)$/',$dt,$matches);
if (!$result) {
throw new \LogicException('The supplied iCalendar datetime value is incorrect: ' . $dt);
}
if ($matches[7]==='Z' || is_null($tz)) {
$tz = new \DateTimeZone('UTC');
}
$date = new \DateTime($matches[1] . '-' . $matches[2] . '-' . $matches[3] . ' ' . $matches[4] . ':' . $matches[5] .':' . $matches[6], $tz);
// Still resetting the timezone, to normalize everything to UTC
$date->setTimeZone(new \DateTimeZone('UTC'));
return $date;
}
/**
* Parses an iCalendar (rfc5545) formatted date and returns a DateTime object
*
* @param string $date
* @return DateTime
*/
static public function parseDate($date) {
// Format is YYYYMMDD
$result = preg_match('/^([1-4][0-9]{3})([0-1][0-9])([0-3][0-9])$/',$date,$matches);
if (!$result) {
throw new \LogicException('The supplied iCalendar date value is incorrect: ' . $date);
}
$date = new \DateTime($matches[1] . '-' . $matches[2] . '-' . $matches[3], new \DateTimeZone('UTC'));
return $date;
}
/**
* Parses an iCalendar (RFC5545) formatted duration value.
*
* This method will either return a DateTimeInterval object, or a string
* suitable for strtotime or DateTime::modify.
*
* @param string $duration
* @param bool $asString
* @return DateInterval|string
*/
static public function parseDuration($duration, $asString = false) {
$result = preg_match('/^(?P<plusminus>\+|-)?P((?P<week>\d+)W)?((?P<day>\d+)D)?(T((?P<hour>\d+)H)?((?P<minute>\d+)M)?((?P<second>\d+)S)?)?$/', $duration, $matches);
if (!$result) {
throw new \LogicException('The supplied iCalendar duration value is incorrect: ' . $duration);
}
if (!$asString) {
$invert = false;
if ($matches['plusminus']==='-') {
$invert = true;
}
$parts = array(
'week',
'day',
'hour',
'minute',
'second',
);
foreach($parts as $part) {
$matches[$part] = isset($matches[$part])&&$matches[$part]?(int)$matches[$part]:0;
}
// We need to re-construct the $duration string, because weeks and
// days are not supported by DateInterval in the same string.
$duration = 'P';
$days = $matches['day'];
if ($matches['week']) {
$days+=$matches['week']*7;
}
if ($days)
$duration.=$days . 'D';
if ($matches['minute'] || $matches['second'] || $matches['hour']) {
$duration.='T';
if ($matches['hour'])
$duration.=$matches['hour'].'H';
if ($matches['minute'])
$duration.=$matches['minute'].'M';
if ($matches['second'])
$duration.=$matches['second'].'S';
}
if ($duration==='P') {
$duration = 'PT0S';
}
$iv = new \DateInterval($duration);
if ($invert) $iv->invert = true;
return $iv;
}
$parts = array(
'week',
'day',
'hour',
'minute',
'second',
);
$newDur = '';
foreach($parts as $part) {
if (isset($matches[$part]) && $matches[$part]) {
$newDur.=' '.$matches[$part] . ' ' . $part . 's';
}
}
$newDur = ($matches['plusminus']==='-'?'-':'+') . trim($newDur);
if ($newDur === '+') { $newDur = '+0 seconds'; };
return $newDur;
}
/**
* Parses either a Date or DateTime, or Duration value.
*
* @param string $date
* @param DateTimeZone|string $referenceTZ
* @return DateTime|DateInterval
*/
static public function parse($date, $referenceTZ = null) {
if ($date[0]==='P' || ($date[0]==='-' && $date[1]==='P')) {
return self::parseDuration($date);
} elseif (strlen($date)===8) {
return self::parseDate($date);
} else {
return self::parseDateTime($date, $referenceTZ);
}
}
}
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