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import {AppBskyFeedDefs, AppBskyFeedPost} from '@atproto/api'
import * as bcp47Match from 'bcp-47-match'
import lande from 'lande'
import {hasProp} from '#/lib/type-guards'
import {
AppLanguage,
LANGUAGES_MAP_CODE2,
LANGUAGES_MAP_CODE3,
} from './languages'
export function code2ToCode3(lang: string): string {
if (lang.length === 2) {
return LANGUAGES_MAP_CODE2[lang]?.code3 || lang
}
return lang
}
export function code3ToCode2(lang: string): string {
if (lang.length === 3) {
return LANGUAGES_MAP_CODE3[lang]?.code2 || lang
}
return lang
}
export function code3ToCode2Strict(lang: string): string | undefined {
if (lang.length === 3) {
return LANGUAGES_MAP_CODE3[lang]?.code2
}
return undefined
}
export function codeToLanguageName(lang: string): string {
const lang2 = code3ToCode2(lang)
return LANGUAGES_MAP_CODE2[lang2]?.name || lang
}
export function getPostLanguage(
post: AppBskyFeedDefs.PostView,
): string | undefined {
let candidates: string[] = []
let postText: string = ''
if (hasProp(post.record, 'text') && typeof post.record.text === 'string') {
postText = post.record.text
}
if (
AppBskyFeedPost.isRecord(post.record) &&
hasProp(post.record, 'langs') &&
Array.isArray(post.record.langs)
) {
candidates = post.record.langs
}
// if there's only one declared language, use that
if (candidates?.length === 1) {
return candidates[0]
}
// no text? can't determine
if (postText.trim().length === 0) {
return undefined
}
// run the language model
let langsProbabilityMap = lande(postText)
// filter down using declared languages
if (candidates?.length) {
langsProbabilityMap = langsProbabilityMap.filter(
([lang, _probability]: [string, number]) => {
return candidates.includes(code3ToCode2(lang))
},
)
}
if (langsProbabilityMap[0]) {
return code3ToCode2(langsProbabilityMap[0][0])
}
}
export function isPostInLanguage(
post: AppBskyFeedDefs.PostView,
targetLangs: string[],
): boolean {
const lang = getPostLanguage(post)
if (!lang) {
// the post has no text, so we just say "yes" for now
return true
}
return bcp47Match.basicFilter(lang, targetLangs).length > 0
}
export function getTranslatorLink(text: string, lang: string): string {
return `https://translate.google.com/?sl=auto&tl=${lang}&text=${encodeURIComponent(
text,
)}`
}
/**
* Returns a valid `appLanguage` value from an arbitrary string.
*
* Context: post-refactor, we populated some user's `appLanguage` setting with
* `postLanguage`, which can be a comma-separated list of values. This breaks
* `appLanguage` handling in the app, so we introduced this util to parse out a
* valid `appLanguage` from the pre-populated `postLanguage` values.
*
* The `appLanguage` will continue to be incorrect until the user returns to
* language settings and selects a new option, at which point we'll re-save
* their choice, which should then be a valid option. Since we don't know when
* this will happen, we should leave this here until we feel it's safe to
* remove, or we re-migrate their storage.
*/
export function sanitizeAppLanguageSetting(appLanguage: string): AppLanguage {
const langs = appLanguage.split(',').filter(Boolean)
for (const lang of langs) {
switch (fixLegacyLanguageCode(lang)) {
case 'en':
return AppLanguage.en
case 'ca':
return AppLanguage.ca
case 'de':
return AppLanguage.de
case 'en-GB':
return AppLanguage.en_GB
case 'es':
return AppLanguage.es
case 'fi':
return AppLanguage.fi
case 'fr':
return AppLanguage.fr
case 'ga':
return AppLanguage.ga
case 'hi':
return AppLanguage.hi
case 'hu':
return AppLanguage.hu
case 'id':
return AppLanguage.id
case 'it':
return AppLanguage.it
case 'ja':
return AppLanguage.ja
case 'ko':
return AppLanguage.ko
case 'pl':
return AppLanguage.pl
case 'pt-BR':
return AppLanguage.pt_BR
case 'ru':
return AppLanguage.ru
case 'th':
return AppLanguage.th
case 'tr':
return AppLanguage.tr
case 'uk':
return AppLanguage.uk
case 'vi':
return AppLanguage.vi
case 'zh-CN':
return AppLanguage.zh_CN
case 'zh-HK':
return AppLanguage.zh_HK
case 'zh-TW':
return AppLanguage.zh_TW
default:
continue
}
}
return AppLanguage.en
}
/**
* Handles legacy migration for Java devices.
*
* {@link https://github.com/bluesky-social/social-app/pull/4461}
* {@link https://xml.coverpages.org/iso639a.html}
*/
export function fixLegacyLanguageCode(code: string | null): string | null {
if (code === 'in') {
// indonesian
return 'id'
}
if (code === 'iw') {
// hebrew
return 'he'
}
if (code === 'ji') {
// yiddish
return 'yi'
}
return code
}
/**
* Find the first language supported by our translation infra. Values should be
* in order of preference, and match the values of {@link AppLanguage}.
*
* If no match, returns `en`.
*/
export function findSupportedAppLanguage(languageTags: (string | undefined)[]) {
const supported = new Set(Object.values(AppLanguage))
for (const tag of languageTags) {
if (!tag) continue
if (supported.has(tag as AppLanguage)) {
return tag
}
}
return AppLanguage.en
}
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