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