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1<?php
2/**
3 * Jingga
4 *
5 * PHP Version 8.1
6 *
7 * @package   phpOMS\Utils\Parser\Calendar
8 * @copyright Dennis Eichhorn
9 * @license   OMS License 2.0
10 * @version   1.0.0
11 * @link      https://jingga.app
12 */
13declare(strict_types=1);
14
15namespace phpOMS\Utils\Parser\Calendar;
16
17/**
18 * iCal parser.
19 *
20 * @package phpOMS\Utils\Parser\Calendar
21 * @license OMS License 2.0
22 * @link    https://jingga.app
23 * @since   1.0.0
24 */
25class ICalParser
26{
27    /**
28     * Parse iCal data
29     *
30     * @param string $data iCal data
31     *
32     * @return array
33     *
34     * @since 1.0.0
35     */
36    public static function parse(string $data) : array
37    {
38        \preg_match_all('/BEGIN:VEVENT(.*?)END:VEVENT/s', $data, $matches, \PREG_SET_ORDER);
39
40        $eventList = [];
41
42        foreach ($matches as $match) {
43            $event = [];
44
45            \preg_match('/UID:(.*?)\r\n/', $match[1], $uidMatch);
46            $event['uid'] = \DateTime::createFromFormat('Ymd\THis', $uidMatch[1]);
47
48            \preg_match('/STATUS:(.*?)\r\n/', $match[1], $statusMatch);
49            $event['status'] = \DateTime::createFromFormat('Ymd\THis', $statusMatch[1]);
50
51            \preg_match('/DTSTART:(.*?)\r\n/', $match[1], $startMatch);
52            $event['start'] = \DateTime::createFromFormat('Ymd\THis', $startMatch[1]);
53
54            \preg_match('/DTEND:(.*?)\r\n/', $match[1], $endMatch);
55            $event['end'] = \DateTime::createFromFormat('Ymd\THis', $endMatch[1]);
56
57            \preg_match('/ORGANIZER:(.*?)\r\n/', $match[1], $organizerMatch);
58            $event['organizer'] = \DateTime::createFromFormat('Ymd\THis', $organizerMatch[1]);
59
60            \preg_match('/SUMMARY:(.*?)\r\n/', $match[1], $summaryMatch);
61            $event['summary'] = $summaryMatch[1];
62
63            \preg_match('/DESCRIPTION:(.*?)\r\n/', $match[1], $descriptionMatch);
64            $event['description'] = $descriptionMatch[1];
65
66            \preg_match('/LOCATION:(.*?)\r\n/', $match[1], $locationMatch);
67            $event['location'] = $locationMatch[1];
68
69            // Check if this event is recurring
70            if (\preg_match('/RRULE:(.*?)\r\n/', $match[1], $rruleMatch)) {
71                $rrule = self::parseRRule($rruleMatch[1]);
72                $event = \array_merge($event, $rrule);
73            }
74
75            $eventList[] = $event;
76        }
77
78        return $eventList;
79    }
80
81    /**
82     * Parse rrule
83     *
84     * @param string $rruleString rrule string
85     *
86     * @return array
87     *
88     * @since 1.0.0
89     */
90    private static function parseRRule($rruleString) : array
91    {
92        $rrule = [];
93
94        \preg_match('/FREQ=(.*?);/', $rruleString, $freqMatch);
95        $rrule['freq'] = $freqMatch[1];
96
97        \preg_match('/INTERVAL=(.*?);/', $rruleString, $intervalMatch);
98        $rrule['interval'] = (int) $intervalMatch[1];
99
100        if (\preg_match('/COUNT=(.*?);/', $rruleString, $countMatch)) {
101            $rrule['count'] = (int) $countMatch[1];
102        }
103
104        if (\preg_match('/UNTIL=(.*?);/', $rruleString, $untilMatch)) {
105            $rrule['until'] = \DateTime::createFromFormat('Ymd\THis', $untilMatch[1]);
106        }
107
108        return $rrule;
109    }
110}