File ICal/Value/Duration.php | PHP iCal Parser API

1:	<?php
2:	declare(strict_types=1);
3:
4:	namespace om\ICal\Value;
5:
6:	use DateInterval;
7:	use Exception;
8:
9:	/**
10:	* DURATION values (RFC 5545, section 3.3.6), e.g. "PT1H30M", "-P1W" or "P1DT12H".
11:	*/
12:	final class Duration {
13:	public static function parse(string $value): ?DateInterval {
14:	$value = strtoupper(trim($value));
15:	// at most 9 digits per part: longer durations (thousands of years) are not meaningful
16:	if (!preg_match('/^([+-])?P(?:(\d{1,9})W)?(?:(\d{1,9})D)?(?:T(?:(\d{1,9})H)?(?:(\d{1,9})M)?(?:(\d{1,9})S)?)?$/D', $value, $match) \|\| !preg_match('/\d/', $value)) {
17:	return null;
18:	}
19:	$days = (int) ($match[2] ?? 0) * 7 + (int) ($match[3] ?? 0);
20:	try {
21:	$interval = new DateInterval(sprintf('P%dDT%dH%dM%dS', $days, (int) ($match[4] ?? 0), (int) ($match[5] ?? 0), (int) ($match[6] ?? 0)));
22:	} catch (Exception) {
23:	return null;
24:	}
25:	$interval->invert = ($match[1] ?? '') === '-' ? 1 : 0;
26:	return $interval;
27:	}
28:
29:	/**
30:	* Format an interval; months and years are not allowed by the RFC and are converted
31:	* to days only when the interval was created by DateTime::diff().
32:	*/
33:	public static function format(DateInterval $interval): string {
34:	$days = $interval->days !== false && ($interval->y \|\| $interval->m) ? $interval->days : $interval->d;
35:	$time = ($interval->h ? $interval->h . 'H' : '') . ($interval->i ? $interval->i . 'M' : '') . ($interval->s ? $interval->s . 'S' : '');
36:	$result = 'P' . ($days ? $days . 'D' : '') . ($time !== '' ? 'T' . $time : '');
37:	return ($interval->invert ? '-' : '') . ($result === 'P' ? 'PT0S' : $result);
38:	}
39:	}
40:

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