34 lines
1 KiB
TypeScript
34 lines
1 KiB
TypeScript
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import { I18nValue, I18nValueDynamic } from '../types'
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export function pluralizeRussian<T>(
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n: number,
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one: T,
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few: T,
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many: T
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): T {
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// reference: https://unicode-org.github.io/cldr-staging/charts/latest/supplemental/language_plural_rules.html#ru
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// one: 1 книга
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// few: 2 книги, 3 книги, 4 книги
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// many: 5 книг, 10 книг, 20 книг, 100 книг (also 0 книг, нет книг)
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const mod10 = n % 10
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const mod100 = n % 100
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if (mod10 === 1 && mod100 !== 11) return one
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if (mod10 >= 2 && mod10 <= 4 && (mod100 < 10 || mod100 >= 20)) return few
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return many
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}
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export function createPluralRussian<Args extends any[] = []>(
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one: I18nValue<[number, ...Args]>,
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few: I18nValue<[number, ...Args]>,
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many: I18nValue<[number, ...Args]>
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): I18nValueDynamic<[number, ...Args]> {
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return (n, ...args) => {
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const val = pluralizeRussian(n, one, few, many)
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if (typeof val === 'function') return val(n, ...args)
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return val
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}
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}
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