remoteLanguagePacks.ts

/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import * as fs from 'fs';
import { FileAccess } from 'vs/base/common/network';
import * as path from 'vs/base/common/path';
import { URI } from 'vs/base/common/uri';

import * as lp from 'vs/base/node/languagePacks';
import product from 'vs/platform/product/common/product';

const metaData = path.join(FileAccess.asFileUri('', require).fsPath, 'nls.metadata.json');
const _cache: Map<string, Promise<lp.NLSConfiguration>> = new Map();

function exists(file: string) {
	return new Promise(c => fs.exists(file, c));
}

export function getNLSConfiguration(language: string, userDataPath: string): Promise<lp.NLSConfiguration> {
	return exists(metaData).then((fileExists) => {
		if (!fileExists || !product.commit) {
			// console.log(`==> MetaData or commit unknown. Using default language.`);
			return Promise.resolve({ locale: 'en', availableLanguages: {} });
		}
		let key = `${language}||${userDataPath}`;
		let result = _cache.get(key);
		if (!result) {
			result = lp.getNLSConfiguration(product.commit, userDataPath, metaData, language).then(value => {
				if (InternalNLSConfiguration.is(value)) {
					value._languagePackSupport = true;
				}
				/**
				 * If the configuration has no results keep trying since code-server
				 * doesn't restart when a language is installed so this result would
				 * persist (the plugin might not be installed yet or something).
				 *
				 * @author coder
				 */
				if (value.locale !== 'en' && value.locale !== 'en-us' && Object.keys(value.availableLanguages).length === 0) {
					_cache.delete(key);
				}
				return value;
			});
			_cache.set(key, result);
		}
		return result;
	});
}

export namespace InternalNLSConfiguration {
	export function is(value: lp.NLSConfiguration): value is lp.InternalNLSConfiguration {
		let candidate: lp.InternalNLSConfiguration = value as lp.InternalNLSConfiguration;
		return candidate && typeof candidate._languagePackId === 'string';
	}
}

/**
 * @author coder
 */
export const getLocaleFromConfig = async (argvResource: URI): Promise<string> => {
	try {
		const content = stripComments(await fs.promises.readFile(argvResource.fsPath, 'utf8'));
		return JSON.parse(content).locale;
	} catch (error) {
		if (error.code !== "ENOENT") {
			console.warn(error)
		}
		return 'en';
	}
};

/**
 * Taken from src/main.js.
 *
 * @author coder
 */
const stripComments = (content: string): string => {
	const regexp = /('(?:[^\\']*(?:\\.)?)*')|('(?:[^\\']*(?:\\.)?)*')|(\/\*(?:\r?\n|.)*?\*\/)|(\/{2,}.*?(?:(?:\r?\n)|$))/g;

	return content.replace(regexp, (match, _m1, _m2, m3, m4) => {
		// Only one of m1, m2, m3, m4 matches
		if (m3) {
			// A block comment. Replace with nothing
			return '';
		} else if (m4) {
			// A line comment. If it ends in \r?\n then keep it.
			const length_1 = m4.length;
			if (length_1 > 2 && m4[length_1 - 1] === '\n') {
				return m4[length_1 - 2] === '\r' ? '\r\n' : '\n';
			}
			else {
				return '';
			}
		} else {
			// We match a string
			return match;
		}
	});
};