smarty/index.js

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/**
* nodeJS 模板引擎(依赖doJS框架)
* @authors yutent (yutent@doui.cc)
* @date 2015-12-28 13:57:12
*
*/
'use strict'
require('es.shim')
const Tool = require('./lib/tool')
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const path = require('path')
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function hash(str) {
return Buffer.from(str).toString('hex')
}
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class Smarty {
constructor(opt) {
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this.opt = { cache: true, ext: '.tpl' }
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if (opt) {
Object.assign(this.opt, opt)
}
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this.__REG__ = new RegExp(this.opt.ext + '$')
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this.tool = new Tool()
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this.__DATA__ = Object.create(null) // 预定义的变量储存
this.__CACHE__ = Object.create(null) // 模块缓存
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}
config(key, val) {
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key += ''
if (!key || !val) {
return
}
this.opt[key] = val
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}
/**
* 定义变量
* @param {Str} key 变量名
* @param {any} val
*/
assign(key, val) {
key += ''
if (!key) {
return this
}
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this.__DATA__[key] = val
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return this
}
/**
* [render 模板渲染]
* @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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render(tpl = '', noParse = false) {
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var key = null
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if (!this.tool.opt.path) {
throw new Error('Smarty engine must define path option')
}
if (!tpl) {
return Promise.reject('argument[tpl] can not be empty')
}
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if (!this.__REG__.test(tpl)) {
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.opt.cache && this.__CACHE__[key]) {
return Promise.resolve(this.__CACHE__[key])
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}
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this.__CACHE__[key] = this.tool.__tpl__(tpl, noParse)
if (noParse) {
return this.__CACHE__[key]
}
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try {
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this.__CACHE__[key] = this.tool.parse(this.__CACHE__[key], this.__DATA__)
return Promise.resolve(this.__CACHE__[key])
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} catch (err) {
return Promise.reject(err)
}
}
}
module.exports = Smarty