/** * 多国语言管理 * * node i18n.mjs init [默认语言代号] * node i18n.mjs build [语言代号] */ import fs from 'node:fs'; import { readdir, readFile, writeFile } from 'node:fs/promises'; import path from 'node:path'; import common from './common.mjs'; class I18N { //构造函数，设置默认配置 constructor(defaultLang, templateDir, langDir, buildDir) { this.defaultLang = typeof(defaultLang) != 'undefined' && defaultLang ? defaultLang : 'en'; this.templateDir = typeof(templateDir) != 'undefined' && templateDir ? templateDir : './public/template/'; this.langDir = typeof(langDir) != 'undefined' && langDir ? langDir : './i18n/'; this.buildDir = typeof(buildDir) != 'undefined' && buildDir ? buildDir : './public/'; } //从模板文件中解析语言占位变量，并生成语言包文件 async init() { const _self = this; try { const files = await readdir(_self.templateDir); let parseLangRes = null; for (const file of files) { parseLangRes = await _self.parseLangFromTemplate(_self.templateDir + file); if (parseLangRes) { console.log('Template file [%s] parse lang config done', file); } } } catch (err) { console.error('Read dir in function init failed', err); return false; } return true; } //根据语言包文件以及模板文件，生成对应语言的html文件 async build(lang) { const _self = this; const langFiles = await _self.getLangFiles(lang); console.log('Lang json files', langFiles); if (langFiles && langFiles.length > 0) { try { let langData = null; let newHtml = '', saved = false; for (const langFile of langFiles) { const langJson = await readFile(_self.langDir + langFile, { encoding: 'utf8' }); if (!langJson) { continue; } langData = JSON.parse(langJson); const files = await readdir(_self.templateDir); for (const file of files) { newHtml = await _self.replaceLangToTemplate(_self.templateDir + file, langData); if (newHtml) { saved = await _self.saveBuildHtml(langFile.replace('.json', ''), file, newHtml); console.log('Template file [%s] lang data replace with [%s] done, html build [%s].', file, langFile, (saved ? 'success' : 'failed')); } } } } catch (err) { console.error('Read dir in function build failed', err); return false; } } return true; } //判断语言代码格式是否符合国际标准 isIosLangCode(lang) { return /^[a-z]{2}(\-[a-z]{2})?$/i.test(lang); } //判断是否是语言包文件 isIosLangFile(filename) { return /^[a-z]{2}(\-[a-z]{2})?\.json$/i.test(filename); } //更新语言包文件内容，合并新的数据到已有内容中 async updateLangFile(langFile, langJson) { const _self = this; let updated = false; try { let json = await readFile(langFile, { encoding: 'utf8'}); if (json) { let data = JSON.parse(json); for (const key in langJson) { data[key] = langJson[key]; } await writeFile(langFile, JSON.stringify(data, null, 4)); }else { await writeFile(langFile, JSON.stringify(langJson, null, 4)); } updated = true; } catch (err) { console.error('updateLangFile failed', err); } return updated; } //解析单个模板文件，并生成语言包文件 async parseLangFromTemplate(templateFilepath) { const _self = this; let langJson = {}, total = 0; try { const html_template = await readFile(templateFilepath, { encoding: 'utf8' }); const regHtmlLang = /[\s\S]*[\s\S]*/i; let htmlLang = html_template.replace(regHtmlLang, "$1"); if (htmlLang == html_template || _self.isIosLangCode(htmlLang) == false) { htmlLang = _self.defaultLang; }else { htmlLang = htmlLang.toLowerCase(); } //模版语法不能包含：换行符、英文冒号、英文分号 const regLang = /\{([^\}\r\n:;]+)\}/ig; const matches = html_template.matchAll(regLang); for (const match of matches) { langJson[match[1]] = match[1]; total ++; } //更新语言包文件 if (total > 0) { let langFile = _self.langDir + `${htmlLang}.json`; const saved = await _self.updateLangFile(langFile, langJson); if (!saved) { return false; } } } catch (err) { console.error('parseLangFromTemplate failed', err); return false; } return langJson; } //获取所有语言包json文件 async getLangFiles(lang) { const _self = this; let langFiles = []; try { const files = await readdir(_self.langDir); let parseLangRes = null; for (const file of files) { if (_self.isIosLangFile(file)) { if (typeof(lang) == 'undefined') { langFiles.push(file); }else if (file.indexOf(lang) > -1) { langFiles.push(file); } } } } catch (err) { console.error('Read dir in function getLangFiles failed', err); return false; } return langFiles; } //根据语言包替换单个模板文件，返回新的html代码 async replaceLangToTemplate(templateFilepath, langData) { const _self = this; let html = ''; try { const html_template = await readFile(templateFilepath, { encoding: 'utf8' }); html = html_template; for (let key in langData) { html = html.replaceAll(`{${key}}`, langData[key]); } } catch (err) { console.error('replaceLangToTemplate failed', err); return false; } return html; } //保存替换了语言包的html文件 async saveBuildHtml(lang, htmlFilename, htmlContent) { const _self = this; let saved = false; try { let langDir = _self.buildDir + lang; if (!fs.existsSync(langDir)) { fs.mkdirSync(langDir); } let htmlFile = `${langDir}/${htmlFilename}`; await writeFile(htmlFile, htmlContent); saved = true; } catch (err) { console.error('saveBuildHtml failed', err); } return saved; } } export default I18N;