patch.ts — vue Source File

Source Code

/**
 * Virtual DOM patching algorithm based on Snabbdom by
 * Simon Friis Vindum (@paldepind)
 * Licensed under the MIT License
 * https://github.com/paldepind/snabbdom/blob/master/LICENSE
 *
 * modified by Evan You (@yyx990803)
 *
 * Not type-checking this because this file is perf-critical and the cost
 * of making flow understand it is not worth it.
 */

import VNode, { cloneVNode } from './vnode'
import config from '../config'
import { SSR_ATTR } from 'shared/constants'
import { registerRef } from './modules/template-ref'
import { traverse } from '../observer/traverse'
import { activeInstance } from '../instance/lifecycle'
import { isTextInputType } from 'web/util/element'

import {
  warn,
  isDef,
  isUndef,
  isTrue,
  isArray,
  makeMap,
  isRegExp,
  isPrimitive
} from '../util/index'

export const emptyNode = new VNode('', {}, [])

const hooks = ['create', 'activate', 'update', 'remove', 'destroy']

function sameVnode(a, b) {
  return (
    a.key === b.key &&
    a.asyncFactory === b.asyncFactory &&
    ((a.tag === b.tag &&
      a.isComment === b.isComment &&
      isDef(a.data) === isDef(b.data) &&
      sameInputType(a, b)) ||
      (isTrue(a.isAsyncPlaceholder) && isUndef(b.asyncFactory.error)))
  )
}

function sameInputType(a, b) {
  if (a.tag !== 'input') return true
  let i
  const typeA = isDef((i = a.data)) && isDef((i = i.attrs)) && i.type
  const typeB = isDef((i = b.data)) && isDef((i = i.attrs)) && i.type
  return typeA === typeB || (isTextInputType(typeA) && isTextInputType(typeB))
}

function createKeyToOldIdx(children, beginIdx, endIdx) {
  let i, key
  const map = {}
  for (i = beginIdx; i <= endIdx; ++i) {
    key = children[i].key
// ... (848 more lines)