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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celemas\Verba; |
| 6 | |
| 7 | use Closure; |
| 8 | |
| 9 | /** |
| 10 | * The messages of a single domain and locale, plus its plural rule. |
| 11 | * |
| 12 | * @api |
| 13 | */ |
| 14 | final class Catalog |
| 15 | { |
| 16 | /** |
| 17 | * @param array<string, string|list<string>|null> $messages |
| 18 | * @param Closure(int): int $plural |
| 19 | */ |
| 20 | public function __construct( |
| 21 | private array $messages, |
| 22 | private Closure $plural, |
| 23 | ) {} |
| 24 | |
| 25 | /** |
| 26 | * Loads `<file>`, falling back to an empty catalog when it is missing or |
| 27 | * does not return an array. |
| 28 | */ |
| 29 | public static function load(string $file, string $locale): self |
| 30 | { |
| 31 | if (!is_file($file)) { |
| 32 | return new self([], Plurals::rule($locale)); |
| 33 | } |
| 34 | |
| 35 | /** @var mixed $data */ |
| 36 | $data = require $file; |
| 37 | |
| 38 | if (!is_array($data)) { |
| 39 | return new self([], Plurals::rule($locale)); |
| 40 | } |
| 41 | |
| 42 | return new self( |
| 43 | self::readMessages($data['messages'] ?? null), |
| 44 | self::readPlural($data['plural'] ?? null, $locale), |
| 45 | ); |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * @return array<string, string|list<string>|null> |
| 50 | */ |
| 51 | private static function readMessages(mixed $messages): array |
| 52 | { |
| 53 | if (!is_array($messages)) { |
| 54 | return []; |
| 55 | } |
| 56 | |
| 57 | /** @var array<string, string|list<string>|null> $messages */ |
| 58 | return $messages; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * A catalog may borrow another language's rule via a `plural` key holding a |
| 63 | * locale/rule id (e.g. `'plural' => 'ru'`); otherwise its own locale rules. |
| 64 | * |
| 65 | * @return Closure(int): int |
| 66 | */ |
| 67 | private static function readPlural(mixed $plural, string $locale): Closure |
| 68 | { |
| 69 | return Plurals::rule(is_string($plural) ? $plural : $locale); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * The raw entry for an id: a string, a list of plural forms, or null when |
| 74 | * absent or explicitly untranslated. |
| 75 | * |
| 76 | * @return string|list<string>|null |
| 77 | */ |
| 78 | public function get(string $id): string|array|null |
| 79 | { |
| 80 | return $this->messages[$id] ?? null; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Zero-based plural form index for a count. |
| 85 | */ |
| 86 | public function form(int $n): int |
| 87 | { |
| 88 | return ($this->plural)($n); |
| 89 | } |
| 90 | } |