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index.js
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index.js
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class Vue {
constructor(options={}){
const vm = this
vm.$options = {
...options
}
vm.data = vm.$options.data
this._initData();
this._initMethods(vm.$options.methods)
vm.$options.el = document.querySelector(vm.$options.el)
vm.$mount(vm.$options.el) // 挂在组件
}
_initData() {
const vm = this
const data = vm.data;
for (let key in data){
//把data中的属性输出到this上
Object.defineProperty(vm, key, {
enumerable: true,
configurable: true,
get: function(){
return this.data[key]
},
set: function(val){
this.data[key] = val;
},
});
}
this._observer = new Observer(data,vm)
}
_initMethods(methods) {
for(let fn in methods){
this[fn] = methods[fn]
}
}
$mount(el) {
if(!el){
throw ("Can't find el")
}
if(el===document.body|| el === document.documentElement){
throw ("el can't use <html> <body>")
}
const vm = this
const options = vm.$options
let template = options.template
// 获取整个 innerHTML 包括节点本身
if(!template||typeof template !== 'string'){
const container = document.createElement('div')
container.appendChild(el.cloneNode(true))
template = container.innerHTML
}
const { render } = vm.compile(template)
// options.render = render
vm._renderProxy = new Proxy(vm, {
has (target, key) {
var has = key in target;
var isAllowed = typeof key === 'string' && key.charAt(0) === '_' && !(key in target.data);
return has || !isAllowed
}
});
// 编译虚拟DOM时需要用到的方法
vm._c = function(tag,data,children){return new VNode(tag, data, children,undefined, vm); }
vm._v = createTextVNode
vm._e = createEmptyVNode
vm._s = _s
const renderFn = createFunction(render)
vm.$options.render = renderFn
vm._wachers = new Watcher(vm,()=>{
const vnode = vm._render();
vm.$el = this._patch(null,vnode);
vm._vnode = vnode
})
}
_render() {
const vm = this
return vm.$options.render.call(vm._renderProxy, vm.$createElement);
}
_update() {
const vm = this
var prevVnode = vm._vnode;
vm._vnode = vm._render()
vm.$el = vm._patch(prevVnode, vm._vnode);
}
_patch(oldVnode,newVnode) {
// 还没有增加diff
if (oldVnode === newVnode) {
return
}
const vm = this
const parent = this.$options.el.parentNode
nodeFn.removeChild(parent,vm.$options.el)
// 创建真实节点
function createElement(parent,node,root){
node.parent = parent
let elm
if(node.tag){
elm = nodeFn.createElement(node.tag) //标签
}else if(node.isComment){
elm = nodeFn.createComment(node.text) //注释
}else{
elm = nodeFn.createTextNode(node.text) //文本
}
node.elm = elm
if(node.data){
if(node.data.attrs){
const attrs = node.data.attrs
for( let key in attrs){
elm.setAttribute(key, attrs[key]);
}
}
if(node.data.on){
for(let event in node.data.on){
elm.addEventListener(event,vm[node.data.on[event]].bind(vm))
}
}
}
//TODO 添加事件等
if(root){
vm.$options.el = elm
nodeFn.insertBefore(parent,elm,vm.$options.el.nextSibling)
}else{
nodeFn.appendChild(parent,elm)
}
if(node.children&&node.children.length){
node.children.forEach(v=>createElement(elm,v))
}
}
createElement(parent,newVnode,true)
return newVnode.elm
}
$createElement(tag, data, children) {
const vm = this
return new VNode(tag, data, children,undefined, vm);
}
compile(template){
const ast = this._parse(template.trim())
console.log(ast)
const code = this._generate(ast)
return {
ast,
render: ("with(this){return " + code + "}"), //传入this变量 可以看下with的用法
}
}
_parse(template){
let last, lastTag
const startTagRe = /^<([^>\s\/]+)((\s+[^=>\s]+(\s*=\s*((\"[^"]*\")|(\'[^']*\')|[^>\s]+))?)*)\s*\/?\s*>/m
const endTagRe = /^<\/([^>\s]+)[^>]*>/m
const attrRe = /([^=\s]+)(\s*=\s*((\"([^"]*)\")|(\'([^']*)\')|[^>\s]+))?/gm
const comment = /^<!\--/
const tempJsRe = /\{\{((?:.|\r?\n)+?)\}\}/g
let root
let currentParent
let i=0
let html = template
while (html.length>0) {
i++
if(i>template.length/10)break
// console.log('当前剩余html----------\n',html)
last = html
let textEnd = html.indexOf('<')
if (textEnd === 0) {
// 如果是注释 可以保留或者剔除
if (comment.test(html)) {
// console.log('碰到注释----------')
const end = html.indexOf('-->')
if (~end) {
currentParent.children.push({
type: 3,
text: html.substring(4, end),
isComment: true,
parent: currentParent
})
html = html.substring(end + 3).trim()
continue
}
}
else if (html.substring(0, 2) == "</") {
// console.log('碰到end标签-----------')
if (endTagRe.test(html)) {
const lc = RegExp.leftContext;
const lm = RegExp.lastMatch;
const rc = RegExp.rightContext;
lm.replace(endTagRe,parseEndTag);
html = rc.trim();
continue
}
}
// 起点标签
else if (html.charAt(0) == "<") {
// console.log('碰到start标签----------')
if (startTagRe.test(html)) {
const lc = RegExp.leftContext;
const lm = RegExp.lastMatch;
const rc = RegExp.rightContext;
const that = this
lm.replace(startTagRe,parseStartTag);
html = rc.trim();
continue
}
}
}
let text, rest, next
if (textEnd >= 0) {
text = html.substring(0, textEnd)
}
if (textEnd < 0) {
text = html
}
if (text) {
const _textData = {
type: 3,
text: text,
parent: currentParent,
static: true // 静态文本节点
}
if(tempJsRe.test(text)){
_textData.type = 2
// 如果有模版js {{}}
_textData.expression = parseText(text)
_textData.static = false // 静态文本节点
}
currentParent.children.push(_textData)
html = html.substring(text.length).trim()
// console.log('碰到文本-----------',text)
}
if (html === last) {
currentParent.children.push({
type: 3,
text: html,
parent: currentParent
})
break
}
}
// end标签
function parseEndTag(tag, tagName){
// console.log('当前end标签------------',tagName)
currentParent = currentParent.parent // 遇到end标签，跳出当前标签
}
// start标签
function parseStartTag (tag, tagName, rest) {
const attrs = []
rest.replace(attrRe, function(a0, a1, a2, a3, a4, a5, a6) {
attrs.push(parseAttribute(tagName, a0, a1, a2, a3, a4, a5, a6));
});
lastTag = tagName
// console.log('当前start标签------------',lastTag,attrs)
if(!root){
root = {
type: 1,
tag: tagName,
children: [],
}
root.parent = root
currentParent = root
}else {
currentParent.children.push({
type: 1,
tag: tagName,
children: [],
parent: currentParent
})
currentParent = currentParent.children[currentParent.children.length-1] // 遇到start标签，开辟新的结构，继续向内部遍历
}
currentParent.attrsList = attrs
}
// 返回属性
function parseAttribute (tagName, Attr, name) {
var value = "";
if (arguments[7]) value = arguments[8];
else if (arguments[5]) value = arguments[6];
else if (arguments[3]) value = arguments[4];
var empty = !value && !arguments[3];
return {
name: name,
value: empty ? null : value
};
}
// 将文本中的模版js提取出来
function parseText(text) {
const expressionList = [];
let lastIndex = tempJsRe.lastIndex = 0;
let match, index, tokenValue;
while (match = tempJsRe.exec(text)) {
index = match.index;
if (index > lastIndex) expressionList.push(JSON.stringify(tokenValue));
let exp = match[1].trim();
expressionList.push(("_s(" + exp + ")"));
lastIndex = index + match[0].length;
}
return expressionList.join('+')
}
return root
}
_generate(el){
const code = getElement(el)
return code
}
}
class VNode {
constructor(tag, data, children,text, context){
this.tag = tag;
this.data = data;
this.children = children;
this.text = text;
this.context = context;
}
}
class Observer {
constructor(value,vm){
this.value = value;
this.vm = vm
this.walk(value);
this.dep = new Dep();
}
walk (obj) {
var dep = new Dep();
const vm = this.vm
vm.data = new Proxy(obj, {
get (target, key) {
const data = target[key]
// 第一次加载this.data时 Dep.target 有值，可以绑定依赖
if(Dep.target){
dep.depend();
}
return data
},
set(target,key,value){
let res = Reflect.set(target, key, value)
dep.notify();
return res
}
})
// defineProperty 版本
// const keys = Object.keys(obj);
// for (let i = 0; i < keys.length; i++) {
// const key = keys[i]
// const value = obj[key]
// Object.defineProperty(obj, key, {
// enumerable: true,
// configurable: true,
// get() {
// return value
// },
// set(newVal) {
// }
// });
// }
}
}
class Watcher {
constructor (vm, Fn) {
this.vm = vm
this.Fn = Fn
this.depIds = new Set(); // 存储depId
this.value = this.getThis()// 需要最后执行。第一次渲染
}
addDep(dep){
if (!this.depIds.has(dep.id)) {
dep.addSubscribe(this);//获取Dep实例，把自己的Watcher实例发送过去
this.depIds.add(dep.id)
}
}
update () {
Promise.resolve().then(()=>{
this.vm._update()
})
}
getThis(){
Dep.target = this
this.Fn&&this.Fn() // 第一次渲染在这里 Dep.target 有值，绑定依赖
Dep.target = null
}
}
let uuid = 0
class Dep {
constructor() {
this.id = uuid ++
this.subscribes = [];
}
depend() {
Dep.target&&Dep.target.addDep(this); //Dep.target已经变成了Watcher，绑定依赖,把自己传到Watcher那边
}
addSubscribe(subscribe) {
this.subscribes.push(subscribe);
}
notify() {
const subscribes = this.subscribes;
for (let i = 0;i < subscribes.length; i++) {
subscribes[i].update(); //依次触发依赖
}
}
}
Dep.target = null //初始化
//转换为函数
function createFunction (code) {
try {
return new Function(code)
} catch (err) {
console.log(err,'err')
}
}
// 输出文本
function _s (val){
return val == null
? ''
: typeof val === 'object'
? JSON.stringify(val, null, 2)
: String(val)
}
// 获取标签上的各种属性
function getData (el){
var data = '{';
if (el.attrsList) {
data += "attrs:{" + (getProps(el.attrsList.filter(item=>!item.name.startsWith('@')))) + "},";
}
const event = el.attrsList.filter(item=>item.name.startsWith('@'))
if(event&&event.length){
data += "on:{" +getHandlers(event) +"},"
}
//TODO 添加事件、自定义v-if等
data = data.replace(/,$/, '') + '}';
return data
}
//获取内容
function getNode(node){
if (node.type === 1) {
return getElement(node)
} else if (node.type === 3 && node.isComment) {
return getComment(node)
} else {
return getText(node)
}
}
function getHandlers(events){
let res = ""
events.forEach(item=>{
res += `"${item.name.replace("@",'')}":"${item.value}",`;
})
return res
}
//获取一般的html标签属性
function getProps (props) {
var res = '';
for (var i = 0; i < props.length; i++) {
var prop = props[i];
res += `"` + (prop.name) + `":"`+ (prop.value.replace(/\u2028/g, '\\u2028').replace(/\u2029/g, '\\u2029')) +`",`;
}
return res.slice(0, -1)
}
//节点，子节点
function getElement(el) {
const data = getData(el);
var children =("[" + (el.children.map(n=> getNode(n)).join(',')) + "]")
code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
return code
}
//注释
function getComment (comment) {
return ("_e(" + (JSON.stringify(comment.text)) + ")")
}
//文本节点
function getText (text) {
return ("_v(" + (text.type === 2
? text.expression
: JSON.stringify(text.text).replace(/\u2028/g, '\\u2028').replace(/\u2029/g, '\\u2029')) + ")")
}
//创建空节点
function createEmptyVNode(text) {
if ( text === void 0 ) text = '';
var node = new VNode();
node.text = text;
node.isComment = true;
return node
};
//创建文本vnode节点
function createTextVNode (val) {
return new VNode(undefined, undefined, undefined, String(val))
}
// 操作节点
const nodeFn = {
createElement (tagName,vnode){
// 创建节点，还有很多类型的比如select需要考虑
return document.createElement(tagName);
},
createTextNode (text) {
return document.createTextNode(text)
},
createComment (text) {
return document.createComment(text)
},
appendChild (node, child) {
node.appendChild(child);
},
removeChild (node, child) {
node.removeChild(child);
},
parentNode (node) {
return node.parentNode
},
insertBefore (parent, node, nNode) {
parent.insertBefore(node, nNode);
}
}