73 строки
2.3 KiB
TypeScript
73 строки
2.3 KiB
TypeScript
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// Copyright (c) Microsoft Corporation.
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// Licensed under the MIT License.
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/* eslint-disable @typescript-eslint/no-var-requires */
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import * as vm from 'vm';
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/**
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* Creates a reusable safe-eval sandbox to execute code in.
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*/
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export function createSandbox(): <T>(code: string, context?: any) => T {
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const sandbox = vm.createContext({});
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return (code: string, context?: any) => {
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const response = 'SAFE_EVAL_' + Math.floor(Math.random() * 1000000);
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sandbox[response] = {};
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if (context) {
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Object.keys(context).forEach(key => sandbox[key] = context[key]);
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vm.runInContext(`try { ${response} = ${code} } catch (e) { ${response} = undefined }`, sandbox);
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for (const key of Object.keys(context)) {
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delete sandbox[key];
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}
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} else {
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vm.runInContext(`${response} = ${code}`, sandbox);
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}
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return sandbox[response];
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};
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}
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export const safeEval = createSandbox();
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type PrimitiveValue = string | number | boolean | undefined | Date;
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let currentLocale = require('./locales/messages.json');
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export function setLocale(newLocale: string | undefined) {
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if (newLocale) {
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currentLocale = require(newLocale);
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}
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}
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/**
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* generates the translation key for a given message
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*
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* @param literals
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* @returns the key
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*/
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function indexOf(literals: TemplateStringsArray) {
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const content = literals.flatMap((k, i) => [k, '$']);
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content.length--; // drop the trailing undefined.
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return content.join('').trim().replace(/ [a-z]/g, ([a, b]) => b.toUpperCase()).replace(/[^a-zA-Z$]/g, '');
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}
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/**
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* Support for tagged template literals for i18n.
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*
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* Leverages translation files in ../i18n
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*
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* @param literals the literal values in the tagged template
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* @param values the inserted values in the template
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*
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* @translator
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*/
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export function i(literals: TemplateStringsArray, ...values: Array<string | number | boolean | undefined | Date>): string {
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const key = indexOf(literals);
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if (key) {
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const str = currentLocale[key]; // get localized string
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if (str) {
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// fill out the template string.
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return safeEval(`\`${str}\``, values.reduce((p, c, i) => { p[`p${i}`] = c; return p; }, <any>{}));
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}
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}
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// if the translation isn't available, just resolve the string template normally.
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return String.raw(literals, ...values);
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}
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