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<?php
declare(strict_types=1);
namespace Sabre\VObject\TimezoneGuesser;
use DateTimeZone;
/**
* Some clients add 'X-LIC-LOCATION' with the olson name.
*/
class FindFromTimezoneMap implements TimezoneFinder
{
private $map = [];
private $patterns = [
'/^\((UTC|GMT)(\+|\-)[\d]{2}\:[\d]{2}\) (.*)/',
'/^\((UTC|GMT)(\+|\-)[\d]{2}\.[\d]{2}\) (.*)/',
];
public function find(string $tzid, bool $failIfUncertain = false): ?DateTimeZone
{
// Next, we check if the tzid is somewhere in our tzid map.
if ($this->hasTzInMap($tzid)) {
return new DateTimeZone($this->getTzFromMap($tzid));
}
// Some Microsoft products prefix the offset first, so let's strip that off
// and see if it is our tzid map. We don't want to check for this first just
// in case there are overrides in our tzid map.
foreach ($this->patterns as $pattern) {
if (!preg_match($pattern, $tzid, $matches)) {
continue;
}
$tzidAlternate = $matches[3];
if ($this->hasTzInMap($tzidAlternate)) {
return new DateTimeZone($this->getTzFromMap($tzidAlternate));
}
}
return null;
}
/**
* This method returns an array of timezone identifiers, that are supported
* by DateTimeZone(), but not returned by DateTimeZone::listIdentifiers().
*
* We're not using DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC) because:
* - It's not supported by some PHP versions as well as HHVM.
* - It also returns identifiers, that are invalid values for new DateTimeZone() on some PHP versions.
* (See timezonedata/php-bc.php and timezonedata php-workaround.php)
*
* @return array
*/
private function getTzMaps()
{
if ([] === $this->map) {
$this->map = array_merge(
include __DIR__.'/../timezonedata/windowszones.php',
include __DIR__.'/../timezonedata/lotuszones.php',
include __DIR__.'/../timezonedata/exchangezones.php',
include __DIR__.'/../timezonedata/php-workaround.php'
);
}
return $this->map;
}
private function getTzFromMap(string $tzid): string
{
return $this->getTzMaps()[$tzid];
}
private function hasTzInMap(string $tzid): bool
{
return isset($this->getTzMaps()[$tzid]);
}
}
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