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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\Component\Intl\DateFormatter\DateFormat;
use Symfony\Component\Intl\Exception\NotImplementedException;
/**
* Parser and formatter for time zone format
*
* @author Igor Wiedler <igor@wiedler.ch>
*/
class TimeZoneTransformer extends Transformer
{
/**
* {@inheritDoc}
*
* @throws NotImplementedException When time zone is different than UTC or GMT (Etc/GMT)
*/
public function format(\DateTime $dateTime, $length)
{
$timeZone = substr($dateTime->getTimezone()->getName(), 0, 3);
if (!in_array($timeZone, array('Etc', 'UTC'))) {
throw new NotImplementedException('Time zone different than GMT or UTC is not supported as a formatting output.');
}
// From ICU >= 4.8, the zero offset is not more used, example: GMT instead of GMT+00:00
$format = (0 !== (int) $dateTime->format('O')) ? '\G\M\TP' : '\G\M\T';
return $dateTime->format($format);
}
/**
* {@inheritDoc}
*/
public function getReverseMatchingRegExp($length)
{
return 'GMT[+-]\d{2}:?\d{2}';
}
/**
* {@inheritDoc}
*/
public function extractDateOptions($matched, $length)
{
return array(
'timezone' => self::getEtcTimeZoneId($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 $formattedTimeZone A GMT timezone string (GMT-03:00, e.g.)
*
* @return string A timezone identifier
*
* @see http://php.net/manual/en/timezones.others.php
* @see http://www.twinsun.com/tz/tz-link.htm
*
* @throws NotImplementedException When the GMT time zone have minutes offset different than zero
* @throws \InvalidArgumentException When the value can not be matched with pattern
*/
public static function getEtcTimeZoneId($formattedTimeZone)
{
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.',
$formattedTimeZone
));
}
return 'Etc/GMT'.($hours !== 0 ? $signal.$hours : '');
}
throw new \InvalidArgumentException('The GMT time zone \'%s\' does not match with the supported formats GMT[+-]HH:MM or GMT[+-]HHMM.');
}
}
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