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1<?php
2namespace Apie\IanaValueObjects\LanguageTag;
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 * Only active language regions can be used.
12 */
13final class ActiveLanguageRegion implements StringValueObjectInterface, LimitedOptionsInterface
14{
15    use IsLanguageSubtag;
16
17    private static StringSet $activeOptions;
18
19    public static function getOptions(): StringSet
20    {
21        if (!isset(static::$activeOptions)) {
22            static::$activeOptions = new StringSet(array_map('strval', array_keys(static::getActiveData())));
23        }
24        return static::$activeOptions;
25    }
26
27    protected static function requiresActive(): bool
28    {
29        return true;
30    }
31
32    protected static function getData(): array
33    {
34        return require __DIR__ . '/../../fixtures/language-regions.php';
35    }
36}