pretur.i18n
Version:
Internationalization using MessageFormat
96 lines • 15 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
function buildLocale(locale, definition) {
return { locale: locale, definition: definition };
}
exports.buildLocale = buildLocale;
function createStringBuilders(locale) {
var MessageFormat = require('messageformat');
var mf = new MessageFormat(locale);
return {
constant: function (str) {
return function () { return str; };
},
callback: function (cb) {
return cb;
},
messageFormat: function (formatString) {
return mf.compile(formatString);
},
};
}
function format(definition, fallback, bundleOrKey, data) {
if (process.env.NODE_ENV !== 'production' && !definition) {
throw new TypeError('definition must be provided');
}
if (bundleOrKey && typeof bundleOrKey === 'object') {
var targetKey = definition[bundleOrKey.key] ||
(fallback && fallback[bundleOrKey.key]);
if (process.env.NODE_ENV !== 'production' && !targetKey) {
throw new TypeError('provided bundle key does not exist in definition or the fallback');
}
return targetKey(bundleOrKey.data);
}
if (typeof bundleOrKey === 'string') {
var targetKey = definition[bundleOrKey] ||
(fallback && fallback[bundleOrKey]);
if (process.env.NODE_ENV !== 'production' && !targetKey) {
throw new TypeError('provided key does not exist in definition or the fallback');
}
return targetKey(data);
}
return '';
}
function bundle(key, data) {
return { key: key, data: data };
}
function internationalize(main) {
var alts = [];
for (var _i = 1; _i < arguments.length; _i++) {
alts[_i - 1] = arguments[_i];
}
var mainDefinition = main.definition(createStringBuilders(main.locale));
var keys = {};
for (var _a = 0, _b = Object.keys(mainDefinition); _a < _b.length; _a++) {
var key = _b[_a];
keys[key] = key;
}
function buildFormatter(locale) {
if (locale === main.locale) {
return function (bundleOrKey, data) {
return format(mainDefinition, undefined, bundleOrKey, data);
};
}
var target = alts.find(function (alt) { return alt.locale === locale; });
if (!target) {
throw new Error("The provided locale " + locale + " does not exist in the list of languages.");
}
var targetDefinition = target.definition(createStringBuilders(locale));
return function (bundleOrKey, data) {
return format(targetDefinition, mainDefinition, bundleOrKey, data);
};
}
return { keys: keys, bundle: bundle, buildFormatter: buildFormatter };
}
exports.internationalize = internationalize;
function combine(i18n1, i18n2) {
var keys = tslib_1.__assign({}, i18n1.keys, i18n2.keys);
function buildFormatter(locale) {
var formatter1 = i18n1.buildFormatter(locale);
var formatter2 = i18n2.buildFormatter(locale);
return function (bundleOrKey, data) {
var key = typeof bundleOrKey === 'string' ? bundleOrKey : bundleOrKey.key;
if (process.env.NODE_ENV !== 'production' && !keys[key]) {
throw new TypeError('provided key does not exist in any of the provided i18ns');
}
if (i18n2.keys[key]) {
return formatter2(bundleOrKey, data);
}
return formatter1(bundleOrKey, data);
};
}
return { keys: keys, bundle: bundle, buildFormatter: buildFormatter };
}
exports.combine = combine;
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interface Bundle<K extends string = string, D = any> {\r\n  key: K;\r\n  data?: D;\r\n}\r\n\r\nexport interface StringBuilder<D = any> {\r\n  (data?: D): string;\r\n}\r\n\r\nexport interface StringBuilders {\r\n  constant(str: string): StringBuilder<undefined>;\r\n  callback<D>(callback: (data?: D) => string): StringBuilder<D>;\r\n  messageFormat<D>(formatString: string): StringBuilder<D>;\r\n}\r\n\r\nexport type Definition<T> = {\r\n  [P in keyof T]: StringBuilder<T[P]>;\r\n};\r\n\r\nexport interface Locale<T> {\r\n  locale: string;\r\n  definition: (builders: StringBuilders) => Definition<T>;\r\n}\r\n\r\nexport function buildLocale<T>(\r\n  locale: string,\r\n  definition: (stringBuilders: StringBuilders) => Definition<T>,\r\n): Locale<T> {\r\n  return { locale, definition };\r\n}\r\n\r\nexport type Keys<T> = {\r\n  [P in keyof T]: P;\r\n};\r\n\r\nexport interface Bundler<T> {\r\n  <K extends keyof T>(key: K, data?: T[K]): Bundle<K, T[K]>;\r\n}\r\n\r\nexport interface Formatter<T> {\r\n  <K extends keyof T>(key: K, data?: T[K]): string;\r\n  <K extends keyof T>(bundle: Bundle<K, T[K]>): string;\r\n}\r\n\r\nfunction createStringBuilders(locale: string): StringBuilders {\r\n  const MessageFormat = require('messageformat');\r\n  const mf = new MessageFormat(locale);\r\n\r\n  return {\r\n    constant(str: string) {\r\n      return () => str;\r\n    },\r\n    callback(cb: (data?: any) => string) {\r\n      return cb;\r\n    },\r\n    messageFormat(formatString: string) {\r\n      return mf.compile(formatString);\r\n    },\r\n  };\r\n}\r\n\r\nfunction format<T>(\r\n  definition: Definition<T>,\r\n  fallback: Definition<T> | undefined,\r\n  bundleOrKey: Bundle | string,\r\n  data?: any,\r\n): string {\r\n  if (process.env.NODE_ENV !== 'production' && !definition) {\r\n    throw new TypeError('definition must be provided');\r\n  }\r\n\r\n  if (bundleOrKey && typeof bundleOrKey === 'object') {\r\n    const targetKey = (<any>definition)[bundleOrKey.key] ||\r\n      (fallback && (<any>fallback)[bundleOrKey.key]);\r\n\r\n    if (process.env.NODE_ENV !== 'production' && !targetKey) {\r\n      throw new TypeError('provided bundle key does not exist in definition or the fallback');\r\n    }\r\n    return targetKey(bundleOrKey.data);\r\n  }\r\n\r\n  if (typeof bundleOrKey === 'string') {\r\n    const targetKey = (<any>definition)[bundleOrKey] ||\r\n      (fallback && (<any>fallback)[bundleOrKey]);\r\n\r\n    if (process.env.NODE_ENV !== 'production' && !targetKey) {\r\n      throw new TypeError('provided key does not exist in definition or the fallback');\r\n    }\r\n    return targetKey(data);\r\n  }\r\n\r\n  return '';\r\n}\r\n\r\nfunction bundle(key: any, data?: any) {\r\n  return { key, data };\r\n}\r\n\r\nexport interface Internationalization<T> {\r\n  keys: Keys<T>;\r\n  bundle: Bundler<T>;\r\n  buildFormatter(locale: string): Formatter<T>;\r\n}\r\n\r\nexport function internationalize<T>(\r\n  main: Locale<T>,\r\n  ...alts: Locale<Partial<T>>[],\r\n): Internationalization<T> {\r\n  const mainDefinition = main.definition(createStringBuilders(main.locale));\r\n\r\n  const keys = <Keys<T>>{};\r\n\r\n  for (const key of Object.keys(mainDefinition)) {\r\n    (<any>keys)[key] = key;\r\n  }\r\n\r\n  function buildFormatter(locale: string): Formatter<T> {\r\n    if (locale === main.locale) {\r\n      return (bundleOrKey: Bundle | string, data?: any) =>\r\n        format(mainDefinition, undefined, bundleOrKey, data);\r\n    }\r\n\r\n    const target = alts.find(alt => alt.locale === locale);\r\n\r\n    if (!target) {\r\n      throw new Error(`The provided locale ${locale} does not exist in the list of languages.`);\r\n    }\r\n\r\n    const targetDefinition = target.definition(createStringBuilders(locale));\r\n\r\n    return (bundleOrKey: Bundle | string, data?: any) =>\r\n      format(targetDefinition, mainDefinition, bundleOrKey, data);\r\n  }\r\n\r\n  return { keys, bundle, buildFormatter };\r\n}\r\n\r\nexport function combine<T1, T2>(\r\n  i18n1: Internationalization<T1>,\r\n  i18n2: Internationalization<T2>,\r\n): Internationalization<T1 & T2> {\r\n  const keys = { ...(<any>i18n1.keys), ...(<any>i18n2.keys) };\r\n\r\n  function buildFormatter(locale: string): Formatter<T1 & T2> {\r\n    const formatter1 = i18n1.buildFormatter(locale);\r\n    const formatter2 = i18n2.buildFormatter(locale);\r\n\r\n    return (bundleOrKey: Bundle | string, data?: any) => {\r\n      const key = typeof bundleOrKey === 'string' ? bundleOrKey : bundleOrKey.key;\r\n      if (process.env.NODE_ENV !== 'production' && !keys[key]) {\r\n        throw new TypeError('provided key does not exist in any of the provided i18ns');\r\n      }\r\n\r\n      if ((<any>i18n2.keys)[key]) {\r\n        return formatter2(<any>bundleOrKey, data);\r\n      }\r\n\r\n      return formatter1(<any>bundleOrKey, data);\r\n    };\r\n  }\r\n\r\n  return { keys, bundle, buildFormatter };\r\n}\r\n"]}