import { deepClone } from '@/utils/index'
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const componentChild = {}
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/**
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* 将./slots中的文件挂载到对象componentChild上
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* 文件名为key，对应JSON配置中的__config__.tag
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* 文件内容为value，解析JSON配置中的__slot__
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*/
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const slotsFiles = require.context('./slots', false, /\.js$/)
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const keys = slotsFiles.keys() || []
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keys.forEach(key => {
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const tag = key.replace(/^\.\/(.*)\.\w+$/, '$1')
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componentChild[tag] = slotsFiles(key).default
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})
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function vModel(dataObject, defaultValue) {
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dataObject.props.value = defaultValue
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dataObject.on.input = val => {
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this.$emit('input', val)
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}
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}
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function mountSlotFiles(h, confClone, children) {
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const childObjs = componentChild[confClone.__config__.tag]
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if (childObjs) {
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Object.keys(childObjs).forEach(key => {
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const childFunc = childObjs[key]
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if (confClone.__slot__ && confClone.__slot__[key]) {
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children.push(childFunc(h, confClone, key))
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}
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})
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}
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}
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function emitEvents(confClone) {
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['on', 'nativeOn'].forEach(attr => {
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const eventKeyList = Object.keys(confClone[attr] || {})
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eventKeyList.forEach(key => {
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const val = confClone[attr][key]
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if (typeof val === 'string') {
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confClone[attr][key] = event => this.$emit(val, event)
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}
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})
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})
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}
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function buildDataObject(confClone, dataObject) {
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Object.keys(confClone).forEach(key => {
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const val = confClone[key]
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if (key === '__vModel__') {
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vModel.call(this, dataObject, confClone.__config__.defaultValue)
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} else if (dataObject[key] !== undefined) {
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if (dataObject[key] === null
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|| dataObject[key] instanceof RegExp
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|| ['boolean', 'string', 'number', 'function'].includes(typeof dataObject[key])) {
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dataObject[key] = val
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} else if (Array.isArray(dataObject[key])) {
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dataObject[key] = [...dataObject[key], ...val]
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} else {
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dataObject[key] = { ...dataObject[key], ...val }
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}
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} else {
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dataObject.attrs[key] = val
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}
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})
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// 清理属性
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clearAttrs(dataObject)
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}
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function clearAttrs(dataObject) {
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delete dataObject.attrs.__config__
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delete dataObject.attrs.__slot__
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delete dataObject.attrs.__methods__
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}
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function makeDataObject() {
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// 深入数据对象：
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// https://cn.vuejs.org/v2/guide/render-function.html#%E6%B7%B1%E5%85%A5%E6%95%B0%E6%8D%AE%E5%AF%B9%E8%B1%A1
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return {
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class: {},
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attrs: {},
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props: {},
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domProps: {},
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nativeOn: {},
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on: {},
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style: {},
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directives: [],
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scopedSlots: {},
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slot: null,
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key: null,
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ref: null,
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refInFor: true
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}
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}
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export default {
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props: {
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conf: {
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type: Object,
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required: true
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}
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},
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render(h) {
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const dataObject = makeDataObject()
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const confClone = deepClone(this.conf)
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const children = this.$slots.default || []
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// 如果slots文件夹存在与当前tag同名的文件，则执行文件中的代码
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mountSlotFiles.call(this, h, confClone, children)
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// 将字符串类型的事件，发送为消息
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emitEvents.call(this, confClone)
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// 将json表单配置转化为vue render可以识别的 “数据对象（dataObject）”
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buildDataObject.call(this, confClone, dataObject)
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return h(this.conf.__config__.tag, dataObject, children)
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}
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}
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