105 lines
2.1 KiB
JavaScript
105 lines
2.1 KiB
JavaScript
/**
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* nodeJS 模板引擎
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* @authors yutent (yutent@doui.cc)
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* @date 2015-12-28 13:57:12
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*
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*/
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'use strict'
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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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class Smarty {
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constructor(opt) {
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this.opt = { cache: true, ext: '.tpl' }
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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.__DATA__ = Object.create(null) // 预定义的变量储存
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this.__CACHE__ = Object.create(null) // 渲染缓存
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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} tpl 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(tpl = '', noParse = false) {
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var key = null
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var cache
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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 (!tpl) {
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return Promise.reject('argument[tpl] can not be empty')
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}
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if (!this.__REG__.test(tpl)) {
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tpl += this.opt.ext
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}
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tpl = path.resolve(this.opt.path, tpl)
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key = hash(tpl)
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if (this.__CACHE__[key]) {
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return Promise.resolve(fs.cat(path.resolve('./cache/', key)))
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}
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cache = this.tool.__readFile__(tpl, noParse)
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if (noParse) {
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this.__CACHE__[key] = true
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fs.echo(cache, path.resolve('./cache/', key))
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return Promise.resolve(cache)
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}
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try {
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cache = this.tool.parse(cache, this.__DATA__)
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if (this.opt.cache) {
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this.__CACHE__[key] = true
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fs.echo(cache, path.resolve('./cache/', key))
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}
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return Promise.resolve(cache)
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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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