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1<?php
2namespace Apie\IanaValueObjects;
3
4use Apie\Core\Lists\StringSet;
5use Apie\Core\ValueObjects\Interfaces\LimitedOptionsInterface;
6use Apie\Core\ValueObjects\Interfaces\StringValueObjectInterface;
7
8/**
9 * All language regions registered in the IANA Language Subtag Registry.
10 *
11 * @see BCP 47
12 * @see RFC 5646
13 * @see RFC 4647
14 * @see https://www.iana.org/assignments/language-subtag-registry
15 *
16 * Any language region that is not active anymore can be used as well (for data integrity).
17 */
18final class LanguageRegion implements StringValueObjectInterface, LimitedOptionsInterface
19{
20    use IsLanguageSubtag;
21
22    protected static function requiresActive(): bool
23    {
24        return false;
25    }
26
27    protected static function getData(): array
28    {
29        return require __DIR__ . '/../fixtures/language-regions.php';
30    }
31
32    public static function getOptions(): StringSet
33    {
34        return new StringSet(array_keys(static::getData()));
35    }
36}