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https://git.friendi.ca/friendica/friendica-addons.git
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181 lines
5.3 KiB
PHP
181 lines
5.3 KiB
PHP
<?php
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namespace Sabre\VObject;
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/**
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* DateTimeParser
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*
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* This class is responsible for parsing the several different date and time
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* formats iCalendar and vCards have.
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*
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* @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
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* @author Evert Pot (http://www.rooftopsolutions.nl/)
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* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
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*/
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class DateTimeParser {
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/**
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* Parses an iCalendar (rfc5545) formatted datetime and returns a DateTime object
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*
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* Specifying a reference timezone is optional. It will only be used
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* if the non-UTC format is used. The argument is used as a reference, the
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* returned DateTime object will still be in the UTC timezone.
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*
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* @param string $dt
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* @param DateTimeZone $tz
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* @return DateTime
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*/
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static public function parseDateTime($dt,\DateTimeZone $tz = null) {
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// Format is YYYYMMDD + "T" + hhmmss
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$result = preg_match('/^([1-3][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,$matches);
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if (!$result) {
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throw new \LogicException('The supplied iCalendar datetime value is incorrect: ' . $dt);
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}
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if ($matches[7]==='Z' || is_null($tz)) {
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$tz = new \DateTimeZone('UTC');
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}
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$date = new \DateTime($matches[1] . '-' . $matches[2] . '-' . $matches[3] . ' ' . $matches[4] . ':' . $matches[5] .':' . $matches[6], $tz);
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// Still resetting the timezone, to normalize everything to UTC
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$date->setTimeZone(new \DateTimeZone('UTC'));
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return $date;
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}
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/**
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* Parses an iCalendar (rfc5545) formatted date and returns a DateTime object
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*
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* @param string $date
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* @return DateTime
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*/
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static public function parseDate($date) {
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// Format is YYYYMMDD
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$result = preg_match('/^([1-3][0-9]{3})([0-1][0-9])([0-3][0-9])$/',$date,$matches);
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if (!$result) {
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throw new \LogicException('The supplied iCalendar date value is incorrect: ' . $date);
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}
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$date = new \DateTime($matches[1] . '-' . $matches[2] . '-' . $matches[3], new \DateTimeZone('UTC'));
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return $date;
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}
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/**
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* Parses an iCalendar (RFC5545) formatted duration value.
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*
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* This method will either return a DateTimeInterval object, or a string
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* suitable for strtotime or DateTime::modify.
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*
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* @param string $duration
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* @param bool $asString
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* @return DateInterval|string
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*/
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static public function parseDuration($duration, $asString = false) {
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$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, $matches);
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if (!$result) {
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throw new \LogicException('The supplied iCalendar duration value is incorrect: ' . $duration);
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}
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if (!$asString) {
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$invert = false;
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if ($matches['plusminus']==='-') {
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$invert = true;
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}
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$parts = array(
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'week',
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'day',
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'hour',
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'minute',
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'second',
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);
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foreach($parts as $part) {
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$matches[$part] = isset($matches[$part])&&$matches[$part]?(int)$matches[$part]:0;
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}
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// We need to re-construct the $duration string, because weeks and
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// days are not supported by DateInterval in the same string.
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$duration = 'P';
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$days = $matches['day'];
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if ($matches['week']) {
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$days+=$matches['week']*7;
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}
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if ($days)
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$duration.=$days . 'D';
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if ($matches['minute'] || $matches['second'] || $matches['hour']) {
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$duration.='T';
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if ($matches['hour'])
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$duration.=$matches['hour'].'H';
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if ($matches['minute'])
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$duration.=$matches['minute'].'M';
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if ($matches['second'])
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$duration.=$matches['second'].'S';
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}
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if ($duration==='P') {
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$duration = 'PT0S';
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}
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$iv = new \DateInterval($duration);
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if ($invert) $iv->invert = true;
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return $iv;
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}
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$parts = array(
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'week',
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'day',
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'hour',
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'minute',
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'second',
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);
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$newDur = '';
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foreach($parts as $part) {
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if (isset($matches[$part]) && $matches[$part]) {
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$newDur.=' '.$matches[$part] . ' ' . $part . 's';
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}
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}
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$newDur = ($matches['plusminus']==='-'?'-':'+') . trim($newDur);
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if ($newDur === '+') { $newDur = '+0 seconds'; };
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return $newDur;
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}
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/**
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* Parses either a Date or DateTime, or Duration value.
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*
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* @param string $date
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* @param DateTimeZone|string $referenceTZ
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* @return DateTime|DateInterval
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*/
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static public function parse($date, $referenceTZ = null) {
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if ($date[0]==='P' || ($date[0]==='-' && $date[1]==='P')) {
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return self::parseDuration($date);
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} elseif (strlen($date)===8) {
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return self::parseDate($date);
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} else {
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return self::parseDateTime($date, $referenceTZ);
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}
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}
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}
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