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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celemas\Verba; |
| 6 | |
| 7 | use Closure; |
| 8 | |
| 9 | /** |
| 10 | * Plural rules keyed by language, using the classic gettext formulas. |
| 11 | * |
| 12 | * Only the exceptions are listed; every other language falls through to the |
| 13 | * two-form `n !== 1` default. Region subtags are honored where they change the |
| 14 | * rule (e.g. `pt_BR`). A catalog may override its rule via the `plural` key. |
| 15 | * |
| 16 | * @api |
| 17 | */ |
| 18 | final class Plurals |
| 19 | { |
| 20 | /** |
| 21 | * Returns the rule mapping a count to its zero-based plural form index. |
| 22 | * |
| 23 | * @return Closure(int): int |
| 24 | */ |
| 25 | public static function rule(string $locale): Closure |
| 26 | { |
| 27 | return self::entry($locale)[1]; |
| 28 | } |
| 29 | |
| 30 | /** |
| 31 | * Number of plural forms (nplurals) for the given locale. |
| 32 | */ |
| 33 | public static function forms(string $locale): int |
| 34 | { |
| 35 | return self::entry($locale)[0]; |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * @return array{int, Closure(int): int} |
| 40 | * |
| 41 | * @psalm-suppress UnusedClosureParam One-form languages ignore the count. |
| 42 | */ |
| 43 | private static function entry(string $locale): array |
| 44 | { |
| 45 | $norm = str_replace('-', '_', strtolower($locale)); |
| 46 | $lang = explode('_', $norm)[0]; |
| 47 | |
| 48 | return match (true) { |
| 49 | $norm === 'pt_br', $lang === 'fr' => [2, static fn(int $n): int => $n > 1 ? 1 : 0], |
| 50 | in_array($lang, ['ja', 'ko', 'zh', 'vi', 'th', 'id', 'fa'], true) => [ |
| 51 | 1, |
| 52 | static fn(int $n): int => 0, |
| 53 | ], |
| 54 | in_array($lang, ['ru', 'uk', 'be'], true) => [ |
| 55 | 3, |
| 56 | static fn(int $n): int => match (true) { |
| 57 | ($n % 10) === 1 && ($n % 100) !== 11 => 0, |
| 58 | ($n % 10) >= 2 && ($n % 10) <= 4 && !(($n % 100) >= 12 && ($n % 100) <= 14) => 1, |
| 59 | default => 2, |
| 60 | }, |
| 61 | ], |
| 62 | $lang === 'pl' => [ |
| 63 | 3, |
| 64 | static fn(int $n): int => match (true) { |
| 65 | $n === 1 => 0, |
| 66 | ($n % 10) >= 2 && ($n % 10) <= 4 && !(($n % 100) >= 12 && ($n % 100) <= 14) => 1, |
| 67 | default => 2, |
| 68 | }, |
| 69 | ], |
| 70 | in_array($lang, ['cs', 'sk'], true) => [ |
| 71 | 3, |
| 72 | static fn(int $n): int => match (true) { |
| 73 | $n === 1 => 0, |
| 74 | $n >= 2 && $n <= 4 => 1, |
| 75 | default => 2, |
| 76 | }, |
| 77 | ], |
| 78 | $lang === 'ar' => [ |
| 79 | 6, |
| 80 | static fn(int $n): int => match (true) { |
| 81 | $n === 0 => 0, |
| 82 | $n === 1 => 1, |
| 83 | $n === 2 => 2, |
| 84 | ($n % 100) >= 3 && ($n % 100) <= 10 => 3, |
| 85 | ($n % 100) >= 11 => 4, |
| 86 | default => 5, |
| 87 | }, |
| 88 | ], |
| 89 | default => [2, static fn(int $n): int => $n === 1 ? 0 : 1], |
| 90 | }; |
| 91 | } |
| 92 | } |