119 lines
2.4 KiB
JavaScript
119 lines
2.4 KiB
JavaScript
/**
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* nodeJS 模板引擎
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* @author yutent<yutent.io@gmail.com>
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* @date 2020/09/18 13:36:47
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*/
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require('es.shim')
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const Tool = require('./lib/tool')
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const path = require('path')
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const fs = require('iofs')
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function hash(str) {
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return Buffer.from(str).toString('hex')
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}
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var cacheDir = path.resolve(__dirname, './cache/')
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class Smarty {
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constructor(opt) {
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this.opt = { ext: '.htm' }
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if (opt) {
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Object.assign(this.opt, opt)
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}
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this.__REG__ = new RegExp(this.opt.ext + '$')
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this.tool = new Tool(this.opt)
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this.reset()
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this.__CACHE__ = Object.create(null) // 渲染缓存
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// 消除缓存目录
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fs.rm(cacheDir)
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}
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reset() {
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this.__DATA__ = Object.create(null) // 预定义的变量储存
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}
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config(key, val) {
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key += ''
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if (!key || val === undefined) {
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return
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}
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this.opt[key] = val
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this.tool.opt[key] = val
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}
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/**
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* 定义变量
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* @param {Str} key 变量名
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* @param {any} val 值
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*/
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assign(key, val) {
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key += ''
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if (!key) {
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return this
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}
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this.__DATA__[key] = val
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return this
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}
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/**
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* [render 模板渲染]
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* @param {String} filePath 模板路径
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* @param {Boolean} noParse 不解析直接读取
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* @return {Promise} 返回一个Promise对象
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*/
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render(filePath = '', noParse = false) {
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var key, ckey, cache, needWrite
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if (!this.opt.path) {
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throw new Error('Smarty engine must define path option')
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}
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if (!filePath) {
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return Promise.reject('argument[filePath] can not be empty')
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}
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if (!this.__REG__.test(filePath)) {
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filePath += this.opt.ext
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}
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filePath = path.resolve(this.opt.path, filePath)
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key = hash(filePath)
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ckey = path.join(cacheDir, key)
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if (this.__CACHE__[key]) {
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cache = fs.cat(ckey)
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} else {
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cache = fs.cat(filePath)
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this.__CACHE__[key] = true
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needWrite = true
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}
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// 无需解析时, 直接输出
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if (noParse) {
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if (needWrite) {
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fs.echo(cache, ckey)
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}
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return Promise.resolve(cache)
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} else {
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if (needWrite) {
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cache = this.tool.parse(cache)
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fs.echo(cache, ckey)
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}
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}
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try {
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var body = this.tool.exec(cache, this.__DATA__)
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this.reset()
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return Promise.resolve(body)
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} catch (err) {
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return Promise.reject(err)
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}
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}
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}
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module.exports = Smarty
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