2018-09-19 23:35:38 +08:00
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import { VNodeFlags } from './flags'
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import { EMPTY_OBJ } from './utils'
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2018-09-20 11:19:25 +08:00
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import { h } from './h'
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2018-09-19 23:35:38 +08:00
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import { VNode, createFragment } from './vdom'
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import { Component, MountedComponent, ComponentClass } from './component'
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import { createTextVNode, cloneVNode } from './vdom'
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import { initializeState } from './componentState'
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import { initializeProps } from './componentProps'
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import {
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initializeComputed,
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getComputedOptions,
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teardownComputed
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} from './componentComputed'
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import { initializeWatch, teardownWatch } from './componentWatch'
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import { Data, ComponentOptions } from './componentOptions'
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import { createRenderProxy } from './componentProxy'
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2018-09-24 08:30:26 +08:00
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import { handleError, ErrorTypes } from './errorHandling'
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2018-09-19 23:35:38 +08:00
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export function createComponentInstance(
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vnode: VNode,
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Component: ComponentClass,
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parentComponent: MountedComponent | null
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): MountedComponent {
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const instance = (vnode.children = new Component()) as MountedComponent
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instance.$parentVNode = vnode
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// renderProxy
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const proxy = (instance.$proxy = createRenderProxy(instance))
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// pointer management
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if (parentComponent) {
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instance.$parent = parentComponent.$proxy
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instance.$root = parentComponent.$root
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parentComponent.$children.push(proxy)
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} else {
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instance.$root = proxy
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}
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// lifecycle
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if (instance.beforeCreate) {
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instance.beforeCreate.call(proxy)
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}
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// TODO provide/inject
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initializeProps(instance, vnode.data)
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initializeState(instance)
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initializeComputed(instance, getComputedOptions(Component))
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initializeWatch(instance, instance.$options.watch)
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instance.$slots = vnode.slots || EMPTY_OBJ
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if (instance.created) {
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instance.created.call(proxy)
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}
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return instance as MountedComponent
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}
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export function renderInstanceRoot(instance: MountedComponent) {
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2018-09-24 08:30:26 +08:00
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let vnode
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try {
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vnode = instance.render.call(
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instance.$proxy,
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instance.$props,
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2018-09-25 07:11:14 +08:00
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instance.$slots,
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instance.$attrs
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2018-09-24 08:30:26 +08:00
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)
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} catch (e1) {
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handleError(e1, instance, ErrorTypes.RENDER)
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if (__DEV__ && instance.renderError) {
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try {
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vnode = instance.renderError.call(instance.$proxy, e1)
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} catch (e2) {
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handleError(e2, instance, ErrorTypes.RENDER_ERROR)
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}
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}
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}
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2018-09-24 11:28:21 +08:00
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return normalizeComponentRoot(
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vnode,
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instance.$parentVNode,
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2018-09-25 06:51:58 +08:00
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instance.$attrs,
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2018-09-24 11:28:21 +08:00
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instance.$options.inheritAttrs
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)
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2018-09-19 23:35:38 +08:00
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}
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export function teardownComponentInstance(instance: MountedComponent) {
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const parentComponent = instance.$parent && instance.$parent._self
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if (parentComponent && !parentComponent._destroyed) {
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parentComponent.$children.splice(
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parentComponent.$children.indexOf(instance.$proxy),
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1
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)
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}
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teardownComputed(instance)
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teardownWatch(instance)
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}
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export function normalizeComponentRoot(
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vnode: any,
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2018-09-24 11:28:21 +08:00
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componentVNode: VNode | null,
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2018-09-25 06:51:58 +08:00
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attrs: Data | void,
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2018-09-24 11:28:21 +08:00
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inheritAttrs: boolean | void
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2018-09-19 23:35:38 +08:00
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): VNode {
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if (vnode == null) {
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vnode = createTextVNode('')
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} else if (typeof vnode !== 'object') {
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vnode = createTextVNode(vnode + '')
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} else if (Array.isArray(vnode)) {
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2018-09-26 05:49:47 +08:00
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if (vnode.length === 1) {
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vnode = normalizeComponentRoot(
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vnode[0],
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componentVNode,
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attrs,
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inheritAttrs
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)
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} else {
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vnode = createFragment(vnode)
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}
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2018-09-19 23:35:38 +08:00
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} else {
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const { flags } = vnode
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if (
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componentVNode &&
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(flags & VNodeFlags.COMPONENT || flags & VNodeFlags.ELEMENT)
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) {
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2018-09-26 01:49:09 +08:00
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if (
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inheritAttrs !== false &&
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attrs !== void 0 &&
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Object.keys(attrs).length > 0
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) {
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2018-09-25 06:51:58 +08:00
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vnode = cloneVNode(vnode, attrs)
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2018-09-25 07:11:14 +08:00
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} else if (vnode.el) {
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2018-09-19 23:35:38 +08:00
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vnode = cloneVNode(vnode)
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}
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if (flags & VNodeFlags.COMPONENT) {
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vnode.parentVNode = componentVNode
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}
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} else if (vnode.el) {
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vnode = cloneVNode(vnode)
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}
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}
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return vnode
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}
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export function shouldUpdateFunctionalComponent(
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prevProps: Data | null,
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nextProps: Data | null
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): boolean {
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if (prevProps === nextProps) {
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return false
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}
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if (prevProps === null) {
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return nextProps !== null
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}
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if (nextProps === null) {
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return prevProps !== null
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}
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let shouldUpdate = true
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const nextKeys = Object.keys(nextProps)
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if (nextKeys.length === Object.keys(prevProps).length) {
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shouldUpdate = false
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for (let i = 0; i < nextKeys.length; i++) {
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const key = nextKeys[i]
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if (nextProps[key] !== prevProps[key]) {
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shouldUpdate = true
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}
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}
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}
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return shouldUpdate
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}
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2018-09-20 11:19:25 +08:00
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// compat only
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2018-09-19 23:35:38 +08:00
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export function createComponentClassFromOptions(
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options: ComponentOptions
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): ComponentClass {
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class ObjectComponent extends Component {
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constructor() {
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super()
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this.$options = options
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}
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}
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for (const key in options) {
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const value = options[key]
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if (typeof value === 'function') {
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2018-09-20 11:19:25 +08:00
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;(ObjectComponent.prototype as any)[key] =
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key === 'render'
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? // normalize render for legacy signature
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function render() {
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return value.call(this, h)
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}
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: value
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2018-09-19 23:35:38 +08:00
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}
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if (key === 'computed') {
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const isGet = typeof value === 'function'
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Object.defineProperty(ObjectComponent.prototype, key, {
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configurable: true,
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get: isGet ? value : value.get,
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set: isGet ? undefined : value.set
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})
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}
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2018-09-20 11:43:27 +08:00
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if (key === 'methods') {
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for (const method in value) {
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;(ObjectComponent.prototype as any)[method] = value[method]
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}
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}
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2018-09-19 23:35:38 +08:00
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}
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return ObjectComponent as ComponentClass
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}
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