117 lines
3.9 KiB
PHP
117 lines
3.9 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Polyfill\Intl\Icu\DateFormat;
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use Symfony\Polyfill\Intl\Icu\Exception\NotImplementedException;
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/**
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* Parser and formatter for time zone format.
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*
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* @author Igor Wiedler <igor@wiedler.ch>
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*
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* @internal
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*/
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class TimezoneTransformer extends Transformer
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{
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/**
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* {@inheritdoc}
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*
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* @throws NotImplementedException When time zone is different than UTC or GMT (Etc/GMT)
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*/
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public function format(\DateTime $dateTime, int $length): string
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{
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$timeZone = substr($dateTime->getTimezone()->getName(), 0, 3);
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if (!\in_array($timeZone, ['Etc', 'UTC', 'GMT'])) {
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throw new NotImplementedException('Time zone different than GMT or UTC is not supported as a formatting output.');
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}
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if ('Etc' === $timeZone) {
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// i.e. Etc/GMT+1, Etc/UTC, Etc/Zulu
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$timeZone = substr($dateTime->getTimezone()->getName(), 4);
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}
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// From ICU >= 59.1 GMT and UTC are no longer unified
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if (\in_array($timeZone, ['UTC', 'UCT', 'Universal', 'Zulu'])) {
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// offset is not supported with UTC
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return $length > 3 ? 'Coordinated Universal Time' : 'UTC';
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}
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$offset = (int) $dateTime->format('O');
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// From ICU >= 4.8, the zero offset is no more used, example: GMT instead of GMT+00:00
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if (0 === $offset) {
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return $length > 3 ? 'Greenwich Mean Time' : 'GMT';
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}
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if ($length > 3) {
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return $dateTime->format('\G\M\TP');
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}
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return sprintf('GMT%s%d', ($offset >= 0 ? '+' : ''), $offset / 100);
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}
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/**
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* {@inheritdoc}
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*/
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public function getReverseMatchingRegExp(int $length): string
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{
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return 'GMT[+-]\d{2}:?\d{2}';
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}
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/**
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* {@inheritdoc}
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*/
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public function extractDateOptions(string $matched, int $length): array
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{
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return [
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'timezone' => self::getEtcTimeZoneId($matched),
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];
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}
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/**
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* Get an Etc/GMT timezone identifier for the specified timezone.
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*
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* The PHP documentation for timezones states to not use the 'Other' time zones because them exists
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* "for backwards compatibility". However all Etc/GMT time zones are in the tz database 'etcetera' file,
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* which indicates they are not deprecated (neither are old names).
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*
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* Only GMT, Etc/Universal, Etc/Zulu, Etc/Greenwich, Etc/GMT-0, Etc/GMT+0 and Etc/GMT0 are old names and
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* are linked to Etc/GMT or Etc/UTC.
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*
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* @param string $formattedTimeZone A GMT timezone string (GMT-03:00, e.g.)
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*
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* @return string A timezone identifier
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*
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* @see https://php.net/timezones.others
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*
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* @throws NotImplementedException When the GMT time zone have minutes offset different than zero
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* @throws \InvalidArgumentException When the value can not be matched with pattern
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*/
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public static function getEtcTimeZoneId(string $formattedTimeZone): string
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{
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if (preg_match('/GMT(?P<signal>[+-])(?P<hours>\d{2}):?(?P<minutes>\d{2})/', $formattedTimeZone, $matches)) {
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$hours = (int) $matches['hours'];
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$minutes = (int) $matches['minutes'];
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$signal = '-' === $matches['signal'] ? '+' : '-';
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if (0 < $minutes) {
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throw new NotImplementedException(sprintf('It is not possible to use a GMT time zone with minutes offset different than zero (0). GMT time zone tried: "%s".', $formattedTimeZone));
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}
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return 'Etc/GMT'.(0 !== $hours ? $signal.$hours : '');
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}
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throw new \InvalidArgumentException(sprintf('The GMT time zone "%s" does not match with the supported formats GMT[+-]HH:MM or GMT[+-]HHMM.', $formattedTimeZone));
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}
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}
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