feat: create class based string localization builder
Ryan Miller
8 months ago
parent
9cf5e3f207
commit
a7c1693532
@ -0,0 +1,297 @@
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import { getFallbackDictionary, getTranslationDictionary } from './translationDictionaries';
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import { en } from '../../localization/locales';
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import { getLocale } from './shared';
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import { LOCALE_DEFAULTS } from '../../localization/constants';
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import { deSanitizeHtmlTags, sanitizeArgs } from '../../components/basic/I18n';
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import type { LocalizerDictionary } from '../../types/Localizer';
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type PluralKey = 'count';
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type ArgString = `${string}{${string}}${string}`;
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type RawString = ArgString | string;
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type PluralString = `{${PluralKey}, plural, one [${RawString}] other [${RawString}]}`;
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// type LocalizedString = string;
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type GenericLocalizedDictionary = Record<string, RawString | PluralString>;
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type TokenString<Dict extends GenericLocalizedDictionary> = keyof Dict extends string
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? keyof Dict
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: never;
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// type GenericArgsRecord = Record<string, string | number>;
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/** The dynamic arguments in a localized string */
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type StringArgs<T extends string> =
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/** If a string follows the plural format use its plural variable name and recursively check for
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* dynamic args inside all plural forms */
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T extends `{${infer PluralVar}, plural, one [${infer PluralOne}] other [${infer PluralOther}]}`
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? PluralVar | StringArgs<PluralOne> | StringArgs<PluralOther>
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: /** If a string segment follows the variable form parse its variable name and recursively
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* check for more dynamic args */
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T extends `${string}{${infer Var}}${infer Rest}`
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? Var | StringArgs<Rest>
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: never;
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export type StringArgsRecord<T extends string> = Record<StringArgs<T>, string | number>;
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// TODO: move this to a test file
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//
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// const stringArgsTestStrings = {
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// none: 'test',
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// one: 'test{count}',
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// two: 'test {count} second {another}',
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// three: 'test {count} second {another} third {third}',
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// four: 'test {count} second {another} third {third} fourth {fourth}',
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// five: 'test {count} second {another} third {third} fourth {fourth} fifth {fifth}',
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// twoConnected: 'test {count}{another}',
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// threeConnected: '{count}{another}{third}',
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// } as const;
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//
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// const stringArgsTestResults = {
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// one: { count: 'count' },
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// two: { count: 'count', another: 'another' },
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// three: { count: 'count', another: 'another', third: 'third' },
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// four: { count: 'count', another: 'another', third: 'third', fourth: 'fourth' },
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// five: { count: 'count', another: 'another', third: 'third', fourth: 'fourth', fifth: 'fifth' },
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// twoConnected: { count: 'count', another: 'another' },
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// threeConnected: { count: 'count', another: 'another', third: 'third' },
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// } as const;
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//
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// let st0: Record<StringArgs<typeof stringArgsTestStrings.none>, string>;
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// const st1: Record<StringArgs<typeof stringArgsTestStrings.one>, string> = stringArgsTestResults.one;
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// const st2: Record<StringArgs<typeof stringArgsTestStrings.two>, string> = stringArgsTestResults.two;
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// const st3: Record<
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// StringArgs<typeof stringArgsTestStrings.three>,
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// string
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// > = stringArgsTestResults.three;
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// const st4: Record<
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// StringArgs<typeof stringArgsTestStrings.four>,
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// string
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// > = stringArgsTestResults.four;
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// const st5: Record<
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// StringArgs<typeof stringArgsTestStrings.five>,
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// string
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// > = stringArgsTestResults.five;
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// const st6: Record<
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// StringArgs<typeof stringArgsTestStrings.twoConnected>,
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// string
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// > = stringArgsTestResults.twoConnected;
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// const st7: Record<
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// StringArgs<typeof stringArgsTestStrings.threeConnected>,
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// string
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// > = stringArgsTestResults.threeConnected;
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//
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// const results = [st0, st1, st2, st3, st4, st5, st6, st7];
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// Above is testing stuff
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function getPluralKey<R extends PluralKey>(string: PluralString): R {
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const match = /{(\w+), plural, one \[.+\] other \[.+\]}/g.exec(string);
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return match?.[1] as R;
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}
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function getStringForCardinalRule(
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localizedString: string,
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cardinalRule: Intl.LDMLPluralRule
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): string | undefined {
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// TODO: investigate if this is the best way to handle regex like this
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const cardinalPluralRegex: Record<Intl.LDMLPluralRule, RegExp> = {
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zero: /zero \[(.*?)\]/g,
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one: /one \[(.*?)\]/g,
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two: /two \[(.*?)\]/g,
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few: /few \[(.*?)\]/g,
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many: /many \[(.*?)\]/g,
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other: /other \[(.*?)\]/g,
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};
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const regex = cardinalPluralRegex[cardinalRule];
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const match = regex.exec(localizedString);
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return match?.[1] ?? undefined;
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}
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const isPluralForm = (localizedString: string): localizedString is PluralString =>
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/{\w+, plural, one \[.+\] other \[.+\]}/g.test(localizedString);
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/**
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* Checks if a string contains a dynamic variable.
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* @param localizedString - The string to check.
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* @returns `true` if the string contains a dynamic variable, otherwise `false`.
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*/
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const isStringWithArgs = (localizedString: string): localizedString is ArgString =>
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localizedString.includes('{');
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/**
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* Logs an i18n message to the console.
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* @param message - The message to log.
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*/
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export function i18nLog(message: string) {
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if (typeof window !== 'undefined') {
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// eslint-disable-next-line no-console
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(window?.log?.error ?? console.log)(`i18n: ${message}`);
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} else {
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// eslint-disable-next-line no-console
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console.log(`i18n: ${message}`);
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}
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}
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const isReplaceLocalizedStringsWithKeysEnabled = () =>
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!!(typeof window !== 'undefined' && window?.sessionFeatureFlags?.replaceLocalizedStringsWithKeys);
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export class LocalizedStringBuilder<
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Dict extends GenericLocalizedDictionary,
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T extends TokenString<Dict>,
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> extends String {
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private readonly token: T;
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private args?: StringArgsRecord<Dict[T]>;
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private isStripped = false;
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private isEnglishForced = false;
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private readonly renderStringAsToken = isReplaceLocalizedStringsWithKeysEnabled();
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constructor(token: T) {
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super(token);
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this.token = token;
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}
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public toString(): string {
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try {
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if (this.renderStringAsToken) {
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return this.token;
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}
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const rawString = this.getRawString();
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const str = isStringWithArgs(rawString) ? this.formatStringWithArgs(rawString) : rawString;
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if (this.isStripped) {
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return this.postProcessStrippedString(str);
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}
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return str;
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} catch (error) {
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i18nLog(error);
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return this.token;
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}
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}
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withArgs(args: StringArgsRecord<Dict[T]>): Omit<this, 'withArgs'> {
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this.args = args;
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return this;
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}
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forceEnglish(): Omit<this, 'forceEnglish'> {
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this.isEnglishForced = true;
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return this;
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}
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strip(): Omit<this, 'strip'> {
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const sanitizedArgs = this.args ? sanitizeArgs(this.args, '\u200B') : undefined;
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if (sanitizedArgs) {
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this.args = sanitizedArgs as StringArgsRecord<Dict[T]>;
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}
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this.isStripped = true;
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return this;
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}
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private postProcessStrippedString(str: string): string {
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const strippedString = str.replaceAll(/<[^>]*>/g, '');
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return deSanitizeHtmlTags(strippedString, '\u200B');
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}
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private getRawString(): RawString | TokenString<Dict> {
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try {
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if (this.renderStringAsToken) {
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return this.token;
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}
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const dict: GenericLocalizedDictionary = this.isEnglishForced
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? en
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: getTranslationDictionary();
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let localizedString = dict[this.token];
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if (!localizedString) {
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i18nLog(`Attempted to get translation for nonexistent key: '${this.token}'`);
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localizedString = (getFallbackDictionary() as GenericLocalizedDictionary)[this.token];
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if (!localizedString) {
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i18nLog(
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`Attempted to get translation for nonexistent key: '${this.token}' in fallback dictionary`
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);
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return this.token;
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}
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}
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return isPluralForm(localizedString)
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? this.resolvePluralString(localizedString)
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: localizedString;
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} catch (error) {
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i18nLog(error.message);
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return this.token;
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}
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}
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private resolvePluralString(str: PluralString): string {
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const pluralKey = getPluralKey(str);
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// This should not be possible, but we need to handle it in case it does happen
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if (!pluralKey) {
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i18nLog(`Attempted to get nonexistent pluralKey for plural form string '${str}'`);
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return this.token;
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}
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let num = this.args?.[pluralKey as keyof StringArgsRecord<Dict[T]>];
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if (num === undefined) {
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i18nLog(`Attempted to get plural count for missing argument '${pluralKey}'`);
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num = 0;
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}
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if (typeof num !== 'number') {
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i18nLog(`Attempted to get plural count for argument '${pluralKey}' which is not a number`);
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num = parseInt(num, 10);
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if (Number.isNaN(num)) {
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i18nLog(
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`Attempted to get parsed plural count for argument '${pluralKey}' which is not a number`
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);
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num = 0;
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}
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}
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const currentLocale = getLocale();
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const cardinalRule = new Intl.PluralRules(currentLocale).select(num);
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const pluralString = getStringForCardinalRule(str, cardinalRule);
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if (!pluralString) {
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i18nLog(`Plural string not found for cardinal '${cardinalRule}': '${str}'`);
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return this.token;
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}
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return pluralString.replaceAll('#', `${num}`);
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}
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private formatStringWithArgs(str: ArgString): string {
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/** Find and replace the dynamic variables in a localized string and substitute the variables with the provided values */
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return str.replace(/\{(\w+)\}/g, (match, arg: string) => {
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const matchedArg = this.args
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? this.args[arg as keyof StringArgsRecord<Dict[T]>].toString()
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: undefined;
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return matchedArg ?? LOCALE_DEFAULTS[arg as keyof typeof LOCALE_DEFAULTS] ?? match;
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});
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}
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}
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export function localize<T extends TokenString<LocalizerDictionary>>(token: T) {
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return new LocalizedStringBuilder<LocalizerDictionary, T>(token);
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}
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export function localizeFromOld<T extends TokenString<LocalizerDictionary>>(
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token: T,
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args: StringArgsRecord<LocalizerDictionary[T]>
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) {
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return new LocalizedStringBuilder<LocalizerDictionary, T>(token).withArgs(args);
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}
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