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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celema\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 | /** @var Closure(int): int */ |
| 17 | private readonly Closure $plural; |
| 18 | |
| 19 | /** |
| 20 | * @param array<string, string|list<string>|null> $messages |
| 21 | * @param string $pluralKey A locale or rule id resolved through {@see Plurals}. |
| 22 | * @param array<string, array<string, string|list<string>|null>> $contexts |
| 23 | */ |
| 24 | public function __construct( |
| 25 | private readonly array $messages, |
| 26 | private readonly string $pluralKey, |
| 27 | private readonly array $contexts = [], |
| 28 | ) { |
| 29 | $this->plural = Plurals::rule($pluralKey); |
| 30 | } |
| 31 | |
| 32 | /** |
| 33 | * Loads `<file>`, falling back to an empty catalog when it is missing or |
| 34 | * does not return an array. |
| 35 | */ |
| 36 | public static function load(string $file, string $locale): self |
| 37 | { |
| 38 | if (!is_file($file)) { |
| 39 | return new self([], $locale); |
| 40 | } |
| 41 | |
| 42 | /** @var mixed $data */ |
| 43 | $data = require $file; |
| 44 | |
| 45 | if (!is_array($data)) { |
| 46 | return new self([], $locale); |
| 47 | } |
| 48 | |
| 49 | return new self( |
| 50 | self::readMessages($data['messages'] ?? null), |
| 51 | self::readPluralKey($data['plural'] ?? null, $locale), |
| 52 | self::readContexts($data['contexts'] ?? null), |
| 53 | ); |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * @return array<string, string|list<string>|null> |
| 58 | */ |
| 59 | private static function readMessages(mixed $messages): array |
| 60 | { |
| 61 | if (!is_array($messages)) { |
| 62 | return []; |
| 63 | } |
| 64 | |
| 65 | /** @var array<string, string|list<string>|null> $messages */ |
| 66 | return $messages; |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * @return array<string, array<string, string|list<string>|null>> |
| 71 | */ |
| 72 | private static function readContexts(mixed $contexts): array |
| 73 | { |
| 74 | if (!is_array($contexts)) { |
| 75 | return []; |
| 76 | } |
| 77 | |
| 78 | $read = []; |
| 79 | |
| 80 | foreach ($contexts as $context => $messages) { |
| 81 | if (!is_string($context) || !is_array($messages)) { |
| 82 | continue; |
| 83 | } |
| 84 | |
| 85 | $read[$context] = self::readMessages($messages); |
| 86 | } |
| 87 | |
| 88 | return $read; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * A catalog may borrow another language's rule via a `plural` key holding a |
| 93 | * locale/rule id (e.g. `'plural' => 'ru'`); otherwise its own locale rules. |
| 94 | */ |
| 95 | private static function readPluralKey(mixed $plural, string $locale): string |
| 96 | { |
| 97 | return is_string($plural) ? $plural : $locale; |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * The raw entry for an id: a string, a list of plural forms, or null when |
| 102 | * absent or explicitly untranslated. |
| 103 | * |
| 104 | * @return string|list<string>|null |
| 105 | */ |
| 106 | public function get(string $id, ?string $context = null): string|array|null |
| 107 | { |
| 108 | $messages = $context === null ? $this->messages : $this->contexts[$context] ?? []; |
| 109 | |
| 110 | return $messages[$id] ?? null; |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Zero-based plural form index for a count. |
| 115 | */ |
| 116 | public function form(int $n): int |
| 117 | { |
| 118 | return ($this->plural)($n); |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * The catalog as canonical, JSON-ready data: the plural rule id plus every |
| 123 | * translated message. Untranslated ids (null or an empty form list) are |
| 124 | * dropped — a consumer of the payload falls back to the id, mirroring the |
| 125 | * runtime. |
| 126 | * |
| 127 | * @return array{ |
| 128 | * plural: string, |
| 129 | * messages: array<string, string|list<string>>, |
| 130 | * contexts?: array<string, array<string, string|list<string>>>, |
| 131 | * } |
| 132 | */ |
| 133 | public function export(): array |
| 134 | { |
| 135 | $export = [ |
| 136 | 'plural' => $this->pluralKey, |
| 137 | 'messages' => self::translated($this->messages), |
| 138 | ]; |
| 139 | $contexts = []; |
| 140 | |
| 141 | foreach ($this->contexts as $context => $messages) { |
| 142 | $messages = self::translated($messages); |
| 143 | |
| 144 | if ($messages !== []) { |
| 145 | $contexts[$context] = $messages; |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | if ($contexts !== []) { |
| 150 | $export['contexts'] = $contexts; |
| 151 | } |
| 152 | |
| 153 | return $export; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * @param array<string, string|list<string>|null> $messages |
| 158 | * @return array<string, string|list<string>> |
| 159 | */ |
| 160 | private static function translated(array $messages): array |
| 161 | { |
| 162 | $translated = []; |
| 163 | |
| 164 | foreach ($messages as $id => $message) { |
| 165 | if ($message === null || $message === []) { |
| 166 | continue; |
| 167 | } |
| 168 | |
| 169 | $translated[$id] = $message; |
| 170 | } |
| 171 | |
| 172 | return $translated; |
| 173 | } |
| 174 | } |