Press n or j to go to the next uncovered block, b, p or k for the previous block.
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46x 526x 1x 1x 1x 480x 480x 480x 10x 10x 480x 480x 480x 282x 39x 527x 39x 39x 39x 8x 39x 31x 31x 525x 441x 441x 527x 85x 46x 46x 169x 169x 169x 169x 46x 46x 85x 335x 335x 335x 335x 335x 19x 19x 335x 335x 335x 335x 38x 38x 335x 335x 335x 335x 3x 3x 335x 335x 325x 325x 325x 335x 79x 79x 335x 335x 335x 335x 3x 3x 3x 3x 3x 335x 328x 335x 335x 335x 335x 45x 41x 41x 22x 7x 335x 335x 335x 335x 335x 85x 148x 148x 148x 148x 148x 148x 148x 148x 147x 147x 148x 85x 2193x 711x 711x 2193x 62x 62x 2193x 2193x 2193x 2193x 85x 85x 1175x 97x 97x 97x 1175x 1078x 1078x 1078x 1078x 1078x 1078x 1078x 1078x 1078x 1078x 1173x 1174x 1169x 1169x 1169x 1169x 1169x 1175x 85x 85x 85x 85x 85x 85x 85x 85x 85x 85x 85x 85x 85x 85x 85x 4x 4x 4x 4x 85x 85x 85x 85x 85x 85x 1137x 1137x 1137x 1137x 1137x 1135x 6x 2x 1135x 1137x 8290x 8290x 8290x 8290x 8290x 5020x 5020x 8290x 3270x 3270x 3270x 8290x 2x 1233x 1233x 1233x 1233x 1233x 1155x 81x 1233x 2x 163x 163x 163x 163x 163x 163x 163x 93x 155x 155x 155x 74x 24x 24x 24x 74x 74x 74x 155x 38x 38x 155x 2x 2x 155x 93x 163x 37x 37x 37x 37x 37x 37x 207x 207x 204x 204x 54x 54x 54x 54x 150x 150x 204x 143x 143x 65x 143x 78x 78x 143x 204x 113x 53x 53x 113x 113x 204x 207x 37x 37x 37x 91x 91x 91x 37x 37x 1327x 1327x 1327x 1327x 1327x 396x 8x 396x 388x 388x 396x 1327x 2x 828x 234x 234x 234x 828x | import {
Comment,
Fragment,
Static,
Text,
type VNode,
type VNodeArrayChildren,
type VNodeHook,
type VNodeProps,
cloneIfMounted,
createVNode,
invokeVNodeHook,
isSameVNodeType,
normalizeVNode,
} from './vnode'
import {
type ComponentInternalInstance,
type ComponentOptions,
type Data,
type LifecycleHook,
createComponentInstance,
setupComponent,
} from './component'
import {
filterSingleRoot,
renderComponentRoot,
shouldUpdateComponent,
updateHOCHostEl,
} from './componentRenderUtils'
import {
EMPTY_ARR,
EMPTY_OBJ,
NOOP,
PatchFlags,
ShapeFlags,
def,
getGlobalThis,
invokeArrayFns,
isArray,
isReservedProp,
} from '@vue/shared'
import {
type SchedulerJob,
SchedulerJobFlags,
type SchedulerJobs,
flushPostFlushCbs,
flushPreFlushCbs,
queueJob,
queuePostFlushCb,
} from './scheduler'
import {
EffectFlags,
ReactiveEffect,
pauseTracking,
resetTracking,
} from '@vue/reactivity'
import { updateProps } from './componentProps'
import { updateSlots } from './componentSlots'
import { popWarningContext, pushWarningContext, warn } from './warning'
import { type CreateAppFunction, createAppAPI } from './apiCreateApp'
import { setRef } from './rendererTemplateRef'
import {
type SuspenseBoundary,
type SuspenseImpl,
isSuspense,
queueEffectWithSuspense,
} from './components/Suspense'
import {
TeleportEndKey,
type TeleportImpl,
type TeleportVNode,
} from './components/Teleport'
import { type KeepAliveContext, isKeepAlive } from './components/KeepAlive'
import { isHmrUpdating, registerHMR, unregisterHMR } from './hmr'
import { type RootHydrateFunction, createHydrationFunctions } from './hydration'
import { invokeDirectiveHook } from './directives'
import { endMeasure, startMeasure } from './profiling'
import {
devtoolsComponentAdded,
devtoolsComponentRemoved,
devtoolsComponentUpdated,
setDevtoolsHook,
} from './devtools'
import { initFeatureFlags } from './featureFlags'
import { isAsyncWrapper } from './apiAsyncComponent'
import { isCompatEnabled } from './compat/compatConfig'
import { DeprecationTypes } from './compat/compatConfig'
import type { TransitionHooks } from './components/BaseTransition'
export interface Renderer<HostElement = RendererElement> {
render: RootRenderFunction<HostElement>
createApp: CreateAppFunction<HostElement>
}
export interface HydrationRenderer extends Renderer<Element | ShadowRoot> {
hydrate: RootHydrateFunction
}
export type ElementNamespace = 'svg' | 'mathml' | undefined
export type RootRenderFunction<HostElement = RendererElement> = (
vnode: VNode | null,
container: HostElement,
namespace?: ElementNamespace,
) => void
export interface RendererOptions<
HostNode = RendererNode,
HostElement = RendererElement,
> {
patchProp(
el: HostElement,
key: string,
prevValue: any,
nextValue: any,
namespace?: ElementNamespace,
parentComponent?: ComponentInternalInstance | null,
): void
insert(el: HostNode, parent: HostElement, anchor?: HostNode | null): void
remove(el: HostNode): void
createElement(
type: string,
namespace?: ElementNamespace,
isCustomizedBuiltIn?: string,
vnodeProps?: (VNodeProps & { [key: string]: any }) | null,
): HostElement
createText(text: string): HostNode
createComment(text: string): HostNode
setText(node: HostNode, text: string): void
setElementText(node: HostElement, text: string): void
parentNode(node: HostNode): HostElement | null
nextSibling(node: HostNode): HostNode | null
querySelector?(selector: string): HostElement | null
setScopeId?(el: HostElement, id: string): void
cloneNode?(node: HostNode): HostNode
insertStaticContent?(
content: string,
parent: HostElement,
anchor: HostNode | null,
namespace: ElementNamespace,
start?: HostNode | null,
end?: HostNode | null,
): [HostNode, HostNode]
}
// Renderer Node can technically be any object in the context of core renderer
// logic - they are never directly operated on and always passed to the node op
// functions provided via options, so the internal constraint is really just
// a generic object.
export interface RendererNode {
[key: string | symbol]: any
}
export interface RendererElement extends RendererNode {}
// An object exposing the internals of a renderer, passed to tree-shakeable
// features so that they can be decoupled from this file. Keys are shortened
// to optimize bundle size.
export interface RendererInternals<
HostNode = RendererNode,
HostElement = RendererElement,
> {
p: PatchFn
um: UnmountFn
r: RemoveFn
m: MoveFn
mt: MountComponentFn
mc: MountChildrenFn
pc: PatchChildrenFn
pbc: PatchBlockChildrenFn
n: NextFn
o: RendererOptions<HostNode, HostElement>
}
// These functions are created inside a closure and therefore their types cannot
// be directly exported. In order to avoid maintaining function signatures in
// two places, we declare them once here and use them inside the closure.
type PatchFn = (
n1: VNode | null, // null means this is a mount
n2: VNode,
container: RendererElement,
anchor?: RendererNode | null,
parentComponent?: ComponentInternalInstance | null,
parentSuspense?: SuspenseBoundary | null,
namespace?: ElementNamespace,
slotScopeIds?: string[] | null,
optimized?: boolean,
) => void
type MountChildrenFn = (
children: VNodeArrayChildren,
container: RendererElement,
anchor: RendererNode | null,
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
namespace: ElementNamespace,
slotScopeIds: string[] | null,
optimized: boolean,
start?: number,
) => void
type PatchChildrenFn = (
n1: VNode | null,
n2: VNode,
container: RendererElement,
anchor: RendererNode | null,
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
namespace: ElementNamespace,
slotScopeIds: string[] | null,
optimized: boolean,
) => void
type PatchBlockChildrenFn = (
oldChildren: VNode[],
newChildren: VNode[],
fallbackContainer: RendererElement,
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
namespace: ElementNamespace,
slotScopeIds: string[] | null,
) => void
type MoveFn = (
vnode: VNode,
container: RendererElement,
anchor: RendererNode | null,
type: MoveType,
parentSuspense?: SuspenseBoundary | null,
) => void
type NextFn = (vnode: VNode) => RendererNode | null
type UnmountFn = (
vnode: VNode,
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
doRemove?: boolean,
optimized?: boolean,
) => void
type RemoveFn = (vnode: VNode) => void
type UnmountChildrenFn = (
children: VNode[],
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
doRemove?: boolean,
optimized?: boolean,
start?: number,
) => void
export type MountComponentFn = (
initialVNode: VNode,
container: RendererElement,
anchor: RendererNode | null,
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
namespace: ElementNamespace,
optimized: boolean,
) => void
type ProcessTextOrCommentFn = (
n1: VNode | null,
n2: VNode,
container: RendererElement,
anchor: RendererNode | null,
) => void
export type SetupRenderEffectFn = (
instance: ComponentInternalInstance,
initialVNode: VNode,
container: RendererElement,
anchor: RendererNode | null,
parentSuspense: SuspenseBoundary | null,
namespace: ElementNamespace,
optimized: boolean,
) => void
export enum MoveType {
ENTER,
LEAVE,
REORDER,
}
export const queuePostRenderEffect: (
fn: SchedulerJobs,
suspense: SuspenseBoundary | null,
) => void = __FEATURE_SUSPENSE__
? __TEST__
? // vitest can't seem to handle eager circular dependency
(fn: Function | Function[], suspense: SuspenseBoundary | null) =>
queueEffectWithSuspense(fn, suspense)
: queueEffectWithSuspense
: queuePostFlushCb
/**
* The createRenderer function accepts two generic arguments:
* HostNode and HostElement, corresponding to Node and Element types in the
* host environment. For example, for runtime-dom, HostNode would be the DOM
* `Node` interface and HostElement would be the DOM `Element` interface.
*
* Custom renderers can pass in the platform specific types like this:
*
* ``` js
* const { render, createApp } = createRenderer<Node, Element>({
* patchProp,
* ...nodeOps
* })
* ```
*/
export function createRenderer<
HostNode = RendererNode,
HostElement = RendererElement,
>(options: RendererOptions<HostNode, HostElement>): Renderer<HostElement> {
return baseCreateRenderer<HostNode, HostElement>(options)
}
// Separate API for creating hydration-enabled renderer.
// Hydration logic is only used when calling this function, making it
// tree-shakable.
export function createHydrationRenderer(
options: RendererOptions<Node, Element>,
): HydrationRenderer {
return baseCreateRenderer(options, createHydrationFunctions)
}
// overload 1: no hydration
function baseCreateRenderer<
HostNode = RendererNode,
HostElement = RendererElement,
>(options: RendererOptions<HostNode, HostElement>): Renderer<HostElement>
// overload 2: with hydration
function baseCreateRenderer(
options: RendererOptions<Node, Element>,
createHydrationFns: typeof createHydrationFunctions,
): HydrationRenderer
// implementation
function baseCreateRenderer(
options: RendererOptions,
createHydrationFns?: typeof createHydrationFunctions,
): any {
// compile-time feature flags check
if (__ESM_BUNDLER__ && !__TEST__) {
initFeatureFlags()
}
const target = getGlobalThis()
target.__VUE__ = true
if (__DEV__ || __FEATURE_PROD_DEVTOOLS__) {
setDevtoolsHook(target.__VUE_DEVTOOLS_GLOBAL_HOOK__, target)
}
const {
insert: hostInsert,
remove: hostRemove,
patchProp: hostPatchProp,
createElement: hostCreateElement,
createText: hostCreateText,
createComment: hostCreateComment,
setText: hostSetText,
setElementText: hostSetElementText,
parentNode: hostParentNode,
nextSibling: hostNextSibling,
setScopeId: hostSetScopeId = NOOP,
insertStaticContent: hostInsertStaticContent,
} = options
// Note: functions inside this closure should use `const xxx = () => {}`
// style in order to prevent being inlined by minifiers.
const patch: PatchFn = (
n1,
n2,
container,
anchor = null,
parentComponent = null,
parentSuspense = null,
namespace = undefined,
slotScopeIds = null,
optimized = __DEV__ && isHmrUpdating ? false : !!n2.dynamicChildren,
) => {
if (n1 === n2) {
return
}
// patching & not same type, unmount old tree
if (n1 && !isSameVNodeType(n1, n2)) {
anchor = getNextHostNode(n1)
unmount(n1, parentComponent, parentSuspense, true)
n1 = null
}
if (n2.patchFlag === PatchFlags.BAIL) {
optimized = false
n2.dynamicChildren = null
}
const { type, ref, shapeFlag } = n2
switch (type) {
case Text:
processText(n1, n2, container, anchor)
break
case Comment:
processCommentNode(n1, n2, container, anchor)
break
case Static:
if (n1 == null) {
mountStaticNode(n2, container, anchor, namespace)
} else if (__DEV__) {
patchStaticNode(n1, n2, container, namespace)
}
break
case Fragment:
processFragment(
n1,
n2,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
break
default:
if (shapeFlag & ShapeFlags.ELEMENT) {
processElement(
n1,
n2,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
} else if (shapeFlag & ShapeFlags.COMPONENT) {
processComponent(
n1,
n2,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
} else if (shapeFlag & ShapeFlags.TELEPORT) {
;(type as typeof TeleportImpl).process(
n1 as TeleportVNode,
n2 as TeleportVNode,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
internals,
)
} else if (__FEATURE_SUSPENSE__ && shapeFlag & ShapeFlags.SUSPENSE) {
;(type as typeof SuspenseImpl).process(
n1,
n2,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
internals,
)
} else if (__DEV__) {
warn('Invalid VNode type:', type, `(${typeof type})`)
}
}
// set ref
if (ref != null && parentComponent) {
setRef(ref, n1 && n1.ref, parentSuspense, n2 || n1, !n2)
}
}
const processText: ProcessTextOrCommentFn = (n1, n2, container, anchor) => {
if (n1 == null) {
hostInsert(
(n2.el = hostCreateText(n2.children as string)),
container,
anchor,
)
} else {
const el = (n2.el = n1.el!)
if (n2.children !== n1.children) {
hostSetText(el, n2.children as string)
}
}
}
const processCommentNode: ProcessTextOrCommentFn = (
n1,
n2,
container,
anchor,
) => {
if (n1 == null) {
hostInsert(
(n2.el = hostCreateComment((n2.children as string) || '')),
container,
anchor,
)
} else {
// there's no support for dynamic comments
n2.el = n1.el
}
}
const mountStaticNode = (
n2: VNode,
container: RendererElement,
anchor: RendererNode | null,
namespace: ElementNamespace,
) => {
// static nodes are only present when used with compiler-dom/runtime-dom
// which guarantees presence of hostInsertStaticContent.
;[n2.el, n2.anchor] = hostInsertStaticContent!(
n2.children as string,
container,
anchor,
namespace,
n2.el,
n2.anchor,
)
}
/**
* Dev / HMR only
*/
const patchStaticNode = (
n1: VNode,
n2: VNode,
container: RendererElement,
namespace: ElementNamespace,
) => {
// static nodes are only patched during dev for HMR
if (n2.children !== n1.children) {
const anchor = hostNextSibling(n1.anchor!)
// remove existing
removeStaticNode(n1)
// insert new
;[n2.el, n2.anchor] = hostInsertStaticContent!(
n2.children as string,
container,
anchor,
namespace,
)
} else {
n2.el = n1.el
n2.anchor = n1.anchor
}
}
const moveStaticNode = (
{ el, anchor }: VNode,
container: RendererElement,
nextSibling: RendererNode | null,
) => {
let next
while (el && el !== anchor) {
next = hostNextSibling(el)
hostInsert(el, container, nextSibling)
el = next
}
hostInsert(anchor!, container, nextSibling)
}
const removeStaticNode = ({ el, anchor }: VNode) => {
let next
while (el && el !== anchor) {
next = hostNextSibling(el)
hostRemove(el)
el = next
}
hostRemove(anchor!)
}
const processElement = (
n1: VNode | null,
n2: VNode,
container: RendererElement,
anchor: RendererNode | null,
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
namespace: ElementNamespace,
slotScopeIds: string[] | null,
optimized: boolean,
) => {
if (n2.type === 'svg') {
namespace = 'svg'
} else if (n2.type === 'math') {
namespace = 'mathml'
}
if (n1 == null) {
mountElement(
n2,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
} else {
patchElement(
n1,
n2,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
}
}
const mountElement = (
vnode: VNode,
container: RendererElement,
anchor: RendererNode | null,
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
namespace: ElementNamespace,
slotScopeIds: string[] | null,
optimized: boolean,
) => {
let el: RendererElement
let vnodeHook: VNodeHook | undefined | null
const { props, shapeFlag, transition, dirs } = vnode
el = vnode.el = hostCreateElement(
vnode.type as string,
namespace,
props && props.is,
props,
)
// mount children first, since some props may rely on child content
// being already rendered, e.g. `<select value>`
if (shapeFlag & ShapeFlags.TEXT_CHILDREN) {
hostSetElementText(el, vnode.children as string)
} else if (shapeFlag & ShapeFlags.ARRAY_CHILDREN) {
mountChildren(
vnode.children as VNodeArrayChildren,
el,
null,
parentComponent,
parentSuspense,
resolveChildrenNamespace(vnode, namespace),
slotScopeIds,
optimized,
)
}
if (dirs) {
invokeDirectiveHook(vnode, null, parentComponent, 'created')
}
// scopeId
setScopeId(el, vnode, vnode.scopeId, slotScopeIds, parentComponent)
// props
if (props) {
for (const key in props) {
if (key !== 'value' && !isReservedProp(key)) {
hostPatchProp(el, key, null, props[key], namespace, parentComponent)
}
}
/**
* Special case for setting value on DOM elements:
* - it can be order-sensitive (e.g. should be set *after* min/max, #2325, #4024)
* - it needs to be forced (#1471)
* #2353 proposes adding another renderer option to configure this, but
* the properties affects are so finite it is worth special casing it
* here to reduce the complexity. (Special casing it also should not
* affect non-DOM renderers)
*/
if ('value' in props) {
hostPatchProp(el, 'value', null, props.value, namespace)
}
if ((vnodeHook = props.onVnodeBeforeMount)) {
invokeVNodeHook(vnodeHook, parentComponent, vnode)
}
}
if (__DEV__ || __FEATURE_PROD_DEVTOOLS__) {
def(el, '__vnode', vnode, true)
def(el, '__vueParentComponent', parentComponent, true)
}
if (dirs) {
invokeDirectiveHook(vnode, null, parentComponent, 'beforeMount')
}
// #1583 For inside suspense + suspense not resolved case, enter hook should call when suspense resolved
// #1689 For inside suspense + suspense resolved case, just call it
const needCallTransitionHooks = needTransition(parentSuspense, transition)
if (needCallTransitionHooks) {
transition!.beforeEnter(el)
}
hostInsert(el, container, anchor)
if (
(vnodeHook = props && props.onVnodeMounted) ||
needCallTransitionHooks ||
dirs
) {
queuePostRenderEffect(() => {
vnodeHook && invokeVNodeHook(vnodeHook, parentComponent, vnode)
needCallTransitionHooks && transition!.enter(el)
dirs && invokeDirectiveHook(vnode, null, parentComponent, 'mounted')
}, parentSuspense)
}
}
const setScopeId = (
el: RendererElement,
vnode: VNode,
scopeId: string | null,
slotScopeIds: string[] | null,
parentComponent: ComponentInternalInstance | null,
) => {
if (scopeId) {
hostSetScopeId(el, scopeId)
}
if (slotScopeIds) {
for (let i = 0; i < slotScopeIds.length; i++) {
hostSetScopeId(el, slotScopeIds[i])
}
}
if (parentComponent) {
let subTree = parentComponent.subTree
if (
__DEV__ &&
subTree.patchFlag > 0 &&
subTree.patchFlag & PatchFlags.DEV_ROOT_FRAGMENT
) {
subTree =
filterSingleRoot(subTree.children as VNodeArrayChildren) || subTree
}
if (
vnode === subTree ||
(isSuspense(subTree.type) &&
(subTree.ssContent === vnode || subTree.ssFallback === vnode))
) {
const parentVNode = parentComponent.vnode
setScopeId(
el,
parentVNode,
parentVNode.scopeId,
parentVNode.slotScopeIds,
parentComponent.parent,
)
}
}
}
const mountChildren: MountChildrenFn = (
children,
container,
anchor,
parentComponent,
parentSuspense,
namespace: ElementNamespace,
slotScopeIds,
optimized,
start = 0,
) => {
for (let i = start; i < children.length; i++) {
const child = (children[i] = optimized
? cloneIfMounted(children[i] as VNode)
: normalizeVNode(children[i]))
patch(
null,
child,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
}
}
const patchElement = (
n1: VNode,
n2: VNode,
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
namespace: ElementNamespace,
slotScopeIds: string[] | null,
optimized: boolean,
) => {
const el = (n2.el = n1.el!)
if (__DEV__ || __FEATURE_PROD_DEVTOOLS__) {
el.__vnode = n2
}
let { patchFlag, dynamicChildren, dirs } = n2
// #1426 take the old vnode's patch flag into account since user may clone a
// compiler-generated vnode, which de-opts to FULL_PROPS
patchFlag |= n1.patchFlag & PatchFlags.FULL_PROPS
const oldProps = n1.props || EMPTY_OBJ
const newProps = n2.props || EMPTY_OBJ
let vnodeHook: VNodeHook | undefined | null
// disable recurse in beforeUpdate hooks
parentComponent && toggleRecurse(parentComponent, false)
if ((vnodeHook = newProps.onVnodeBeforeUpdate)) {
invokeVNodeHook(vnodeHook, parentComponent, n2, n1)
}
if (dirs) {
invokeDirectiveHook(n2, n1, parentComponent, 'beforeUpdate')
}
parentComponent && toggleRecurse(parentComponent, true)
if (__DEV__ && isHmrUpdating) {
// HMR updated, force full diff
patchFlag = 0
optimized = false
dynamicChildren = null
}
// #9135 innerHTML / textContent unset needs to happen before possible
// new children mount
if (
(oldProps.innerHTML && newProps.innerHTML == null) ||
(oldProps.textContent && newProps.textContent == null)
) {
hostSetElementText(el, '')
}
if (dynamicChildren) {
patchBlockChildren(
n1.dynamicChildren!,
dynamicChildren,
el,
parentComponent,
parentSuspense,
resolveChildrenNamespace(n2, namespace),
slotScopeIds,
)
if (__DEV__) {
// necessary for HMR
traverseStaticChildren(n1, n2)
}
} else if (!optimized) {
// full diff
patchChildren(
n1,
n2,
el,
null,
parentComponent,
parentSuspense,
resolveChildrenNamespace(n2, namespace),
slotScopeIds,
false,
)
}
if (patchFlag > 0) {
// the presence of a patchFlag means this element's render code was
// generated by the compiler and can take the fast path.
// in this path old node and new node are guaranteed to have the same shape
// (i.e. at the exact same position in the source template)
if (patchFlag & PatchFlags.FULL_PROPS) {
// element props contain dynamic keys, full diff needed
patchProps(el, oldProps, newProps, parentComponent, namespace)
} else {
// class
// this flag is matched when the element has dynamic class bindings.
if (patchFlag & PatchFlags.CLASS) {
if (oldProps.class !== newProps.class) {
hostPatchProp(el, 'class', null, newProps.class, namespace)
}
}
// style
// this flag is matched when the element has dynamic style bindings
if (patchFlag & PatchFlags.STYLE) {
hostPatchProp(el, 'style', oldProps.style, newProps.style, namespace)
}
// props
// This flag is matched when the element has dynamic prop/attr bindings
// other than class and style. The keys of dynamic prop/attrs are saved for
// faster iteration.
// Note dynamic keys like :[foo]="bar" will cause this optimization to
// bail out and go through a full diff because we need to unset the old key
if (patchFlag & PatchFlags.PROPS) {
// if the flag is present then dynamicProps must be non-null
const propsToUpdate = n2.dynamicProps!
for (let i = 0; i < propsToUpdate.length; i++) {
const key = propsToUpdate[i]
const prev = oldProps[key]
const next = newProps[key]
// #1471 force patch value
if (next !== prev || key === 'value') {
hostPatchProp(el, key, prev, next, namespace, parentComponent)
}
}
}
}
// text
// This flag is matched when the element has only dynamic text children.
if (patchFlag & PatchFlags.TEXT) {
if (n1.children !== n2.children) {
hostSetElementText(el, n2.children as string)
}
}
} else if (!optimized && dynamicChildren == null) {
// unoptimized, full diff
patchProps(el, oldProps, newProps, parentComponent, namespace)
}
if ((vnodeHook = newProps.onVnodeUpdated) || dirs) {
queuePostRenderEffect(() => {
vnodeHook && invokeVNodeHook(vnodeHook, parentComponent, n2, n1)
dirs && invokeDirectiveHook(n2, n1, parentComponent, 'updated')
}, parentSuspense)
}
}
// The fast path for blocks.
const patchBlockChildren: PatchBlockChildrenFn = (
oldChildren,
newChildren,
fallbackContainer,
parentComponent,
parentSuspense,
namespace: ElementNamespace,
slotScopeIds,
) => {
for (let i = 0; i < newChildren.length; i++) {
const oldVNode = oldChildren[i]
const newVNode = newChildren[i]
// Determine the container (parent element) for the patch.
const container =
// oldVNode may be an errored async setup() component inside Suspense
// which will not have a mounted element
oldVNode.el &&
// - In the case of a Fragment, we need to provide the actual parent
// of the Fragment itself so it can move its children.
(oldVNode.type === Fragment ||
// - In the case of different nodes, there is going to be a replacement
// which also requires the correct parent container
!isSameVNodeType(oldVNode, newVNode) ||
// - In the case of a component, it could contain anything.
oldVNode.shapeFlag & (ShapeFlags.COMPONENT | ShapeFlags.TELEPORT))
? hostParentNode(oldVNode.el)!
: // In other cases, the parent container is not actually used so we
// just pass the block element here to avoid a DOM parentNode call.
fallbackContainer
patch(
oldVNode,
newVNode,
container,
null,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
true,
)
}
}
const patchProps = (
el: RendererElement,
oldProps: Data,
newProps: Data,
parentComponent: ComponentInternalInstance | null,
namespace: ElementNamespace,
) => {
if (oldProps !== newProps) {
if (oldProps !== EMPTY_OBJ) {
for (const key in oldProps) {
if (!isReservedProp(key) && !(key in newProps)) {
hostPatchProp(
el,
key,
oldProps[key],
null,
namespace,
parentComponent,
)
}
}
}
for (const key in newProps) {
// empty string is not valid prop
if (isReservedProp(key)) continue
const next = newProps[key]
const prev = oldProps[key]
// defer patching value
if (next !== prev && key !== 'value') {
hostPatchProp(el, key, prev, next, namespace, parentComponent)
}
}
if ('value' in newProps) {
hostPatchProp(el, 'value', oldProps.value, newProps.value, namespace)
}
}
}
const processFragment = (
n1: VNode | null,
n2: VNode,
container: RendererElement,
anchor: RendererNode | null,
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
namespace: ElementNamespace,
slotScopeIds: string[] | null,
optimized: boolean,
) => {
const fragmentStartAnchor = (n2.el = n1 ? n1.el : hostCreateText(''))!
const fragmentEndAnchor = (n2.anchor = n1 ? n1.anchor : hostCreateText(''))!
let { patchFlag, dynamicChildren, slotScopeIds: fragmentSlotScopeIds } = n2
if (
__DEV__ &&
// #5523 dev root fragment may inherit directives
(isHmrUpdating || patchFlag & PatchFlags.DEV_ROOT_FRAGMENT)
) {
// HMR updated / Dev root fragment (w/ comments), force full diff
patchFlag = 0
optimized = false
dynamicChildren = null
}
// check if this is a slot fragment with :slotted scope ids
if (fragmentSlotScopeIds) {
slotScopeIds = slotScopeIds
? slotScopeIds.concat(fragmentSlotScopeIds)
: fragmentSlotScopeIds
}
if (n1 == null) {
hostInsert(fragmentStartAnchor, container, anchor)
hostInsert(fragmentEndAnchor, container, anchor)
// a fragment can only have array children
// since they are either generated by the compiler, or implicitly created
// from arrays.
mountChildren(
// #10007
// such fragment like `<></>` will be compiled into
// a fragment which doesn't have a children.
// In this case fallback to an empty array
(n2.children || []) as VNodeArrayChildren,
container,
fragmentEndAnchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
} else {
if (
patchFlag > 0 &&
patchFlag & PatchFlags.STABLE_FRAGMENT &&
dynamicChildren &&
// #2715 the previous fragment could've been a BAILed one as a result
// of renderSlot() with no valid children
n1.dynamicChildren
) {
// a stable fragment (template root or <template v-for>) doesn't need to
// patch children order, but it may contain dynamicChildren.
patchBlockChildren(
n1.dynamicChildren,
dynamicChildren,
container,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
)
if (__DEV__) {
// necessary for HMR
traverseStaticChildren(n1, n2)
} else if (
// #2080 if the stable fragment has a key, it's a <template v-for> that may
// get moved around. Make sure all root level vnodes inherit el.
// #2134 or if it's a component root, it may also get moved around
// as the component is being moved.
n2.key != null ||
(parentComponent && n2 === parentComponent.subTree)
) {
traverseStaticChildren(n1, n2, true /* shallow */)
}
} else {
// keyed / unkeyed, or manual fragments.
// for keyed & unkeyed, since they are compiler generated from v-for,
// each child is guaranteed to be a block so the fragment will never
// have dynamicChildren.
patchChildren(
n1,
n2,
container,
fragmentEndAnchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
}
}
}
const processComponent = (
n1: VNode | null,
n2: VNode,
container: RendererElement,
anchor: RendererNode | null,
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
namespace: ElementNamespace,
slotScopeIds: string[] | null,
optimized: boolean,
) => {
n2.slotScopeIds = slotScopeIds
if (n1 == null) {
if (n2.shapeFlag & ShapeFlags.COMPONENT_KEPT_ALIVE) {
;(parentComponent!.ctx as KeepAliveContext).activate(
n2,
container,
anchor,
namespace,
optimized,
)
} else {
mountComponent(
n2,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
optimized,
)
}
} else {
updateComponent(n1, n2, optimized)
}
}
const mountComponent: MountComponentFn = (
initialVNode,
container,
anchor,
parentComponent,
parentSuspense,
namespace: ElementNamespace,
optimized,
) => {
// 2.x compat may pre-create the component instance before actually
// mounting
const compatMountInstance =
__COMPAT__ && initialVNode.isCompatRoot && initialVNode.component
const instance: ComponentInternalInstance =
compatMountInstance ||
(initialVNode.component = createComponentInstance(
initialVNode,
parentComponent,
parentSuspense,
))
if (__DEV__ && instance.type.__hmrId) {
registerHMR(instance)
}
if (__DEV__) {
pushWarningContext(initialVNode)
startMeasure(instance, `mount`)
}
// inject renderer internals for keepAlive
if (isKeepAlive(initialVNode)) {
;(instance.ctx as KeepAliveContext).renderer = internals
}
// resolve props and slots for setup context
if (!(__COMPAT__ && compatMountInstance)) {
if (__DEV__) {
startMeasure(instance, `init`)
}
setupComponent(instance, false, optimized)
if (__DEV__) {
endMeasure(instance, `init`)
}
}
// setup() is async. This component relies on async logic to be resolved
// before proceeding
if (__FEATURE_SUSPENSE__ && instance.asyncDep) {
// avoid hydration for hmr updating
if (__DEV__ && isHmrUpdating) initialVNode.el = null
parentSuspense &&
parentSuspense.registerDep(instance, setupRenderEffect, optimized)
// Give it a placeholder if this is not hydration
// TODO handle self-defined fallback
if (!initialVNode.el) {
const placeholder = (instance.subTree = createVNode(Comment))
processCommentNode(null, placeholder, container!, anchor)
}
} else {
setupRenderEffect(
instance,
initialVNode,
container,
anchor,
parentSuspense,
namespace,
optimized,
)
}
if (__DEV__) {
popWarningContext()
endMeasure(instance, `mount`)
}
}
const updateComponent = (n1: VNode, n2: VNode, optimized: boolean) => {
const instance = (n2.component = n1.component)!
if (shouldUpdateComponent(n1, n2, optimized)) {
if (
__FEATURE_SUSPENSE__ &&
instance.asyncDep &&
!instance.asyncResolved
) {
// async & still pending - just update props and slots
// since the component's reactive effect for render isn't set-up yet
if (__DEV__) {
pushWarningContext(n2)
}
updateComponentPreRender(instance, n2, optimized)
if (__DEV__) {
popWarningContext()
}
return
} else {
// normal update
instance.next = n2
// instance.update is the reactive effect.
instance.update()
}
} else {
// no update needed. just copy over properties
n2.el = n1.el
instance.vnode = n2
}
}
const setupRenderEffect: SetupRenderEffectFn = (
instance,
initialVNode,
container,
anchor,
parentSuspense,
namespace: ElementNamespace,
optimized,
) => {
const componentUpdateFn = () => {
if (!instance.isMounted) {
let vnodeHook: VNodeHook | null | undefined
const { el, props } = initialVNode
const { bm, m, parent, root, type } = instance
const isAsyncWrapperVNode = isAsyncWrapper(initialVNode)
toggleRecurse(instance, false)
// beforeMount hook
if (bm) {
invokeArrayFns(bm)
}
// onVnodeBeforeMount
if (
!isAsyncWrapperVNode &&
(vnodeHook = props && props.onVnodeBeforeMount)
) {
invokeVNodeHook(vnodeHook, parent, initialVNode)
}
if (
__COMPAT__ &&
isCompatEnabled(DeprecationTypes.INSTANCE_EVENT_HOOKS, instance)
) {
instance.emit('hook:beforeMount')
}
toggleRecurse(instance, true)
if (el && hydrateNode) {
// vnode has adopted host node - perform hydration instead of mount.
const hydrateSubTree = () => {
if (__DEV__) {
startMeasure(instance, `render`)
}
instance.subTree = renderComponentRoot(instance)
if (__DEV__) {
endMeasure(instance, `render`)
}
if (__DEV__) {
startMeasure(instance, `hydrate`)
}
hydrateNode!(
el as Node,
instance.subTree,
instance,
parentSuspense,
null,
)
if (__DEV__) {
endMeasure(instance, `hydrate`)
}
}
if (
isAsyncWrapperVNode &&
(type as ComponentOptions).__asyncHydrate
) {
;(type as ComponentOptions).__asyncHydrate!(
el as Element,
instance,
hydrateSubTree,
)
} else {
hydrateSubTree()
}
} else {
// custom element style injection
if (root.ce) {
root.ce._injectChildStyle(type)
}
if (__DEV__) {
startMeasure(instance, `render`)
}
const subTree = (instance.subTree = renderComponentRoot(instance))
if (__DEV__) {
endMeasure(instance, `render`)
}
if (__DEV__) {
startMeasure(instance, `patch`)
}
patch(
null,
subTree,
container,
anchor,
instance,
parentSuspense,
namespace,
)
if (__DEV__) {
endMeasure(instance, `patch`)
}
initialVNode.el = subTree.el
}
// mounted hook
if (m) {
queuePostRenderEffect(m, parentSuspense)
}
// onVnodeMounted
if (
!isAsyncWrapperVNode &&
(vnodeHook = props && props.onVnodeMounted)
) {
const scopedInitialVNode = initialVNode
queuePostRenderEffect(
() => invokeVNodeHook(vnodeHook!, parent, scopedInitialVNode),
parentSuspense,
)
}
if (
__COMPAT__ &&
isCompatEnabled(DeprecationTypes.INSTANCE_EVENT_HOOKS, instance)
) {
queuePostRenderEffect(
() => instance.emit('hook:mounted'),
parentSuspense,
)
}
// activated hook for keep-alive roots.
// #1742 activated hook must be accessed after first render
// since the hook may be injected by a child keep-alive
if (
initialVNode.shapeFlag & ShapeFlags.COMPONENT_SHOULD_KEEP_ALIVE ||
(parent &&
isAsyncWrapper(parent.vnode) &&
parent.vnode.shapeFlag & ShapeFlags.COMPONENT_SHOULD_KEEP_ALIVE)
) {
instance.a && queuePostRenderEffect(instance.a, parentSuspense)
if (
__COMPAT__ &&
isCompatEnabled(DeprecationTypes.INSTANCE_EVENT_HOOKS, instance)
) {
queuePostRenderEffect(
() => instance.emit('hook:activated'),
parentSuspense,
)
}
}
instance.isMounted = true
if (__DEV__ || __FEATURE_PROD_DEVTOOLS__) {
devtoolsComponentAdded(instance)
}
// #2458: deference mount-only object parameters to prevent memleaks
initialVNode = container = anchor = null as any
} else {
let { next, bu, u, parent, vnode } = instance
if (__FEATURE_SUSPENSE__) {
const nonHydratedAsyncRoot = locateNonHydratedAsyncRoot(instance)
// we are trying to update some async comp before hydration
// this will cause crash because we don't know the root node yet
if (nonHydratedAsyncRoot) {
// only sync the properties and abort the rest of operations
if (next) {
next.el = vnode.el
updateComponentPreRender(instance, next, optimized)
}
// and continue the rest of operations once the deps are resolved
nonHydratedAsyncRoot.asyncDep!.then(() => {
// the instance may be destroyed during the time period
if (!instance.isUnmounted) {
componentUpdateFn()
}
})
return
}
}
// updateComponent
// This is triggered by mutation of component's own state (next: null)
// OR parent calling processComponent (next: VNode)
let originNext = next
let vnodeHook: VNodeHook | null | undefined
if (__DEV__) {
pushWarningContext(next || instance.vnode)
}
// Disallow component effect recursion during pre-lifecycle hooks.
toggleRecurse(instance, false)
if (next) {
next.el = vnode.el
updateComponentPreRender(instance, next, optimized)
} else {
next = vnode
}
// beforeUpdate hook
if (bu) {
invokeArrayFns(bu)
}
// onVnodeBeforeUpdate
if ((vnodeHook = next.props && next.props.onVnodeBeforeUpdate)) {
invokeVNodeHook(vnodeHook, parent, next, vnode)
}
if (
__COMPAT__ &&
isCompatEnabled(DeprecationTypes.INSTANCE_EVENT_HOOKS, instance)
) {
instance.emit('hook:beforeUpdate')
}
toggleRecurse(instance, true)
// render
if (__DEV__) {
startMeasure(instance, `render`)
}
const nextTree = renderComponentRoot(instance)
if (__DEV__) {
endMeasure(instance, `render`)
}
const prevTree = instance.subTree
instance.subTree = nextTree
if (__DEV__) {
startMeasure(instance, `patch`)
}
patch(
prevTree,
nextTree,
// parent may have changed if it's in a teleport
hostParentNode(prevTree.el!)!,
// anchor may have changed if it's in a fragment
getNextHostNode(prevTree),
instance,
parentSuspense,
namespace,
)
if (__DEV__) {
endMeasure(instance, `patch`)
}
next.el = nextTree.el
if (originNext === null) {
// self-triggered update. In case of HOC, update parent component
// vnode el. HOC is indicated by parent instance's subTree pointing
// to child component's vnode
updateHOCHostEl(instance, nextTree.el)
}
// updated hook
if (u) {
queuePostRenderEffect(u, parentSuspense)
}
// onVnodeUpdated
if ((vnodeHook = next.props && next.props.onVnodeUpdated)) {
queuePostRenderEffect(
() => invokeVNodeHook(vnodeHook!, parent, next!, vnode),
parentSuspense,
)
}
if (
__COMPAT__ &&
isCompatEnabled(DeprecationTypes.INSTANCE_EVENT_HOOKS, instance)
) {
queuePostRenderEffect(
() => instance.emit('hook:updated'),
parentSuspense,
)
}
if (__DEV__ || __FEATURE_PROD_DEVTOOLS__) {
devtoolsComponentUpdated(instance)
}
if (__DEV__) {
popWarningContext()
}
}
}
// create reactive effect for rendering
instance.scope.on()
const effect = (instance.effect = new ReactiveEffect(componentUpdateFn))
instance.scope.off()
const update = (instance.update = effect.run.bind(effect))
const job: SchedulerJob = (instance.job = effect.runIfDirty.bind(effect))
job.i = instance
job.id = instance.uid
effect.scheduler = () => queueJob(job)
// allowRecurse
// #1801, #2043 component render effects should allow recursive updates
toggleRecurse(instance, true)
if (__DEV__) {
effect.onTrack = instance.rtc
? e => invokeArrayFns(instance.rtc!, e)
: void 0
effect.onTrigger = instance.rtg
? e => invokeArrayFns(instance.rtg!, e)
: void 0
}
update()
}
const updateComponentPreRender = (
instance: ComponentInternalInstance,
nextVNode: VNode,
optimized: boolean,
) => {
nextVNode.component = instance
const prevProps = instance.vnode.props
instance.vnode = nextVNode
instance.next = null
updateProps(instance, nextVNode.props, prevProps, optimized)
updateSlots(instance, nextVNode.children, optimized)
pauseTracking()
// props update may have triggered pre-flush watchers.
// flush them before the render update.
flushPreFlushCbs(instance)
resetTracking()
}
const patchChildren: PatchChildrenFn = (
n1,
n2,
container,
anchor,
parentComponent,
parentSuspense,
namespace: ElementNamespace,
slotScopeIds,
optimized = false,
) => {
const c1 = n1 && n1.children
const prevShapeFlag = n1 ? n1.shapeFlag : 0
const c2 = n2.children
const { patchFlag, shapeFlag } = n2
// fast path
if (patchFlag > 0) {
if (patchFlag & PatchFlags.KEYED_FRAGMENT) {
// this could be either fully-keyed or mixed (some keyed some not)
// presence of patchFlag means children are guaranteed to be arrays
patchKeyedChildren(
c1 as VNode[],
c2 as VNodeArrayChildren,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
return
} else if (patchFlag & PatchFlags.UNKEYED_FRAGMENT) {
// unkeyed
patchUnkeyedChildren(
c1 as VNode[],
c2 as VNodeArrayChildren,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
return
}
}
// children has 3 possibilities: text, array or no children.
if (shapeFlag & ShapeFlags.TEXT_CHILDREN) {
// text children fast path
if (prevShapeFlag & ShapeFlags.ARRAY_CHILDREN) {
unmountChildren(c1 as VNode[], parentComponent, parentSuspense)
}
if (c2 !== c1) {
hostSetElementText(container, c2 as string)
}
} else {
if (prevShapeFlag & ShapeFlags.ARRAY_CHILDREN) {
// prev children was array
if (shapeFlag & ShapeFlags.ARRAY_CHILDREN) {
// two arrays, cannot assume anything, do full diff
patchKeyedChildren(
c1 as VNode[],
c2 as VNodeArrayChildren,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
} else {
// no new children, just unmount old
unmountChildren(c1 as VNode[], parentComponent, parentSuspense, true)
}
} else {
// prev children was text OR null
// new children is array OR null
if (prevShapeFlag & ShapeFlags.TEXT_CHILDREN) {
hostSetElementText(container, '')
}
// mount new if array
if (shapeFlag & ShapeFlags.ARRAY_CHILDREN) {
mountChildren(
c2 as VNodeArrayChildren,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
}
}
}
}
const patchUnkeyedChildren = (
c1: VNode[],
c2: VNodeArrayChildren,
container: RendererElement,
anchor: RendererNode | null,
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
namespace: ElementNamespace,
slotScopeIds: string[] | null,
optimized: boolean,
) => {
c1 = c1 || EMPTY_ARR
c2 = c2 || EMPTY_ARR
const oldLength = c1.length
const newLength = c2.length
const commonLength = Math.min(oldLength, newLength)
let i
for (i = 0; i < commonLength; i++) {
const nextChild = (c2[i] = optimized
? cloneIfMounted(c2[i] as VNode)
: normalizeVNode(c2[i]))
patch(
c1[i],
nextChild,
container,
null,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
}
if (oldLength > newLength) {
// remove old
unmountChildren(
c1,
parentComponent,
parentSuspense,
true,
false,
commonLength,
)
} else {
// mount new
mountChildren(
c2,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
commonLength,
)
}
}
// can be all-keyed or mixed
const patchKeyedChildren = (
c1: VNode[],
c2: VNodeArrayChildren,
container: RendererElement,
parentAnchor: RendererNode | null,
parentComponent: ComponentInternalInstance | null,
parentSuspense: SuspenseBoundary | null,
namespace: ElementNamespace,
slotScopeIds: string[] | null,
optimized: boolean,
) => {
let i = 0
const l2 = c2.length
let e1 = c1.length - 1 // prev ending index
let e2 = l2 - 1 // next ending index
// 1. sync from start
// (a b) c
// (a b) d e
while (i <= e1 && i <= e2) {
const n1 = c1[i]
const n2 = (c2[i] = optimized
? cloneIfMounted(c2[i] as VNode)
: normalizeVNode(c2[i]))
if (isSameVNodeType(n1, n2)) {
patch(
n1,
n2,
container,
null,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
} else {
break
}
i++
}
// 2. sync from end
// a (b c)
// d e (b c)
while (i <= e1 && i <= e2) {
const n1 = c1[e1]
const n2 = (c2[e2] = optimized
? cloneIfMounted(c2[e2] as VNode)
: normalizeVNode(c2[e2]))
if (isSameVNodeType(n1, n2)) {
patch(
n1,
n2,
container,
null,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
} else {
break
}
e1--
e2--
}
// 3. common sequence + mount
// (a b)
// (a b) c
// i = 2, e1 = 1, e2 = 2
// (a b)
// c (a b)
// i = 0, e1 = -1, e2 = 0
if (i > e1) {
if (i <= e2) {
const nextPos = e2 + 1
const anchor = nextPos < l2 ? (c2[nextPos] as VNode).el : parentAnchor
while (i <= e2) {
patch(
null,
(c2[i] = optimized
? cloneIfMounted(c2[i] as VNode)
: normalizeVNode(c2[i])),
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
i++
}
}
}
// 4. common sequence + unmount
// (a b) c
// (a b)
// i = 2, e1 = 2, e2 = 1
// a (b c)
// (b c)
// i = 0, e1 = 0, e2 = -1
else if (i > e2) {
while (i <= e1) {
unmount(c1[i], parentComponent, parentSuspense, true)
i++
}
}
// 5. unknown sequence
// [i ... e1 + 1]: a b [c d e] f g
// [i ... e2 + 1]: a b [e d c h] f g
// i = 2, e1 = 4, e2 = 5
else {
const s1 = i // prev starting index
const s2 = i // next starting index
// 5.1 build key:index map for newChildren
const keyToNewIndexMap: Map<PropertyKey, number> = new Map()
for (i = s2; i <= e2; i++) {
const nextChild = (c2[i] = optimized
? cloneIfMounted(c2[i] as VNode)
: normalizeVNode(c2[i]))
if (nextChild.key != null) {
if (__DEV__ && keyToNewIndexMap.has(nextChild.key)) {
warn(
`Duplicate keys found during update:`,
JSON.stringify(nextChild.key),
`Make sure keys are unique.`,
)
}
keyToNewIndexMap.set(nextChild.key, i)
}
}
// 5.2 loop through old children left to be patched and try to patch
// matching nodes & remove nodes that are no longer present
let j
let patched = 0
const toBePatched = e2 - s2 + 1
let moved = false
// used to track whether any node has moved
let maxNewIndexSoFar = 0
// works as Map<newIndex, oldIndex>
// Note that oldIndex is offset by +1
// and oldIndex = 0 is a special value indicating the new node has
// no corresponding old node.
// used for determining longest stable subsequence
const newIndexToOldIndexMap = new Array(toBePatched)
for (i = 0; i < toBePatched; i++) newIndexToOldIndexMap[i] = 0
for (i = s1; i <= e1; i++) {
const prevChild = c1[i]
if (patched >= toBePatched) {
// all new children have been patched so this can only be a removal
unmount(prevChild, parentComponent, parentSuspense, true)
continue
}
let newIndex
if (prevChild.key != null) {
newIndex = keyToNewIndexMap.get(prevChild.key)
} else {
// key-less node, try to locate a key-less node of the same type
for (j = s2; j <= e2; j++) {
if (
newIndexToOldIndexMap[j - s2] === 0 &&
isSameVNodeType(prevChild, c2[j] as VNode)
) {
newIndex = j
break
}
}
}
if (newIndex === undefined) {
unmount(prevChild, parentComponent, parentSuspense, true)
} else {
newIndexToOldIndexMap[newIndex - s2] = i + 1
if (newIndex >= maxNewIndexSoFar) {
maxNewIndexSoFar = newIndex
} else {
moved = true
}
patch(
prevChild,
c2[newIndex] as VNode,
container,
null,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
patched++
}
}
// 5.3 move and mount
// generate longest stable subsequence only when nodes have moved
const increasingNewIndexSequence = moved
? getSequence(newIndexToOldIndexMap)
: EMPTY_ARR
j = increasingNewIndexSequence.length - 1
// looping backwards so that we can use last patched node as anchor
for (i = toBePatched - 1; i >= 0; i--) {
const nextIndex = s2 + i
const nextChild = c2[nextIndex] as VNode
const anchor =
nextIndex + 1 < l2 ? (c2[nextIndex + 1] as VNode).el : parentAnchor
if (newIndexToOldIndexMap[i] === 0) {
// mount new
patch(
null,
nextChild,
container,
anchor,
parentComponent,
parentSuspense,
namespace,
slotScopeIds,
optimized,
)
} else if (moved) {
// move if:
// There is no stable subsequence (e.g. a reverse)
// OR current node is not among the stable sequence
if (j < 0 || i !== increasingNewIndexSequence[j]) {
move(nextChild, container, anchor, MoveType.REORDER)
} else {
j--
}
}
}
}
}
const move: MoveFn = (
vnode,
container,
anchor,
moveType,
parentSuspense = null,
) => {
const { el, type, transition, children, shapeFlag } = vnode
if (shapeFlag & ShapeFlags.COMPONENT) {
move(vnode.component!.subTree, container, anchor, moveType)
return
}
if (__FEATURE_SUSPENSE__ && shapeFlag & ShapeFlags.SUSPENSE) {
vnode.suspense!.move(container, anchor, moveType)
return
}
if (shapeFlag & ShapeFlags.TELEPORT) {
;(type as typeof TeleportImpl).move(vnode, container, anchor, internals)
return
}
if (type === Fragment) {
hostInsert(el!, container, anchor)
for (let i = 0; i < (children as VNode[]).length; i++) {
move((children as VNode[])[i], container, anchor, moveType)
}
hostInsert(vnode.anchor!, container, anchor)
return
}
if (type === Static) {
moveStaticNode(vnode, container, anchor)
return
}
// single nodes
const needTransition =
moveType !== MoveType.REORDER &&
shapeFlag & ShapeFlags.ELEMENT &&
transition
if (needTransition) {
if (moveType === MoveType.ENTER) {
transition!.beforeEnter(el!)
hostInsert(el!, container, anchor)
queuePostRenderEffect(() => transition!.enter(el!), parentSuspense)
} else {
const { leave, delayLeave, afterLeave } = transition!
const remove = () => hostInsert(el!, container, anchor)
const performLeave = () => {
leave(el!, () => {
remove()
afterLeave && afterLeave()
})
}
if (delayLeave) {
delayLeave(el!, remove, performLeave)
} else {
performLeave()
}
}
} else {
hostInsert(el!, container, anchor)
}
}
const unmount: UnmountFn = (
vnode,
parentComponent,
parentSuspense,
doRemove = false,
optimized = false,
) => {
const {
type,
props,
ref,
children,
dynamicChildren,
shapeFlag,
patchFlag,
dirs,
cacheIndex,
} = vnode
if (patchFlag === PatchFlags.BAIL) {
optimized = false
}
// unset ref
if (ref != null) {
setRef(ref, null, parentSuspense, vnode, true)
}
// #6593 should clean memo cache when unmount
if (cacheIndex != null) {
parentComponent!.renderCache[cacheIndex] = undefined
}
if (shapeFlag & ShapeFlags.COMPONENT_SHOULD_KEEP_ALIVE) {
;(parentComponent!.ctx as KeepAliveContext).deactivate(vnode)
return
}
const shouldInvokeDirs = shapeFlag & ShapeFlags.ELEMENT && dirs
const shouldInvokeVnodeHook = !isAsyncWrapper(vnode)
let vnodeHook: VNodeHook | undefined | null
if (
shouldInvokeVnodeHook &&
(vnodeHook = props && props.onVnodeBeforeUnmount)
) {
invokeVNodeHook(vnodeHook, parentComponent, vnode)
}
if (shapeFlag & ShapeFlags.COMPONENT) {
unmountComponent(vnode.component!, parentSuspense, doRemove)
} else {
if (__FEATURE_SUSPENSE__ && shapeFlag & ShapeFlags.SUSPENSE) {
vnode.suspense!.unmount(parentSuspense, doRemove)
return
}
if (shouldInvokeDirs) {
invokeDirectiveHook(vnode, null, parentComponent, 'beforeUnmount')
}
if (shapeFlag & ShapeFlags.TELEPORT) {
;(vnode.type as typeof TeleportImpl).remove(
vnode,
parentComponent,
parentSuspense,
internals,
doRemove,
)
} else if (
dynamicChildren &&
// #5154
// when v-once is used inside a block, setBlockTracking(-1) marks the
// parent block with hasOnce: true
// so that it doesn't take the fast path during unmount - otherwise
// components nested in v-once are never unmounted.
!dynamicChildren.hasOnce &&
// #1153: fast path should not be taken for non-stable (v-for) fragments
(type !== Fragment ||
(patchFlag > 0 && patchFlag & PatchFlags.STABLE_FRAGMENT))
) {
// fast path for block nodes: only need to unmount dynamic children.
unmountChildren(
dynamicChildren,
parentComponent,
parentSuspense,
false,
true,
)
} else if (
(type === Fragment &&
patchFlag &
(PatchFlags.KEYED_FRAGMENT | PatchFlags.UNKEYED_FRAGMENT)) ||
(!optimized && shapeFlag & ShapeFlags.ARRAY_CHILDREN)
) {
unmountChildren(children as VNode[], parentComponent, parentSuspense)
}
if (doRemove) {
remove(vnode)
}
}
if (
(shouldInvokeVnodeHook &&
(vnodeHook = props && props.onVnodeUnmounted)) ||
shouldInvokeDirs
) {
queuePostRenderEffect(() => {
vnodeHook && invokeVNodeHook(vnodeHook, parentComponent, vnode)
shouldInvokeDirs &&
invokeDirectiveHook(vnode, null, parentComponent, 'unmounted')
}, parentSuspense)
}
}
const remove: RemoveFn = vnode => {
const { type, el, anchor, transition } = vnode
if (type === Fragment) {
if (
__DEV__ &&
vnode.patchFlag > 0 &&
vnode.patchFlag & PatchFlags.DEV_ROOT_FRAGMENT &&
transition &&
!transition.persisted
) {
;(vnode.children as VNode[]).forEach(child => {
if (child.type === Comment) {
hostRemove(child.el!)
} else {
remove(child)
}
})
} else {
removeFragment(el!, anchor!)
}
return
}
if (type === Static) {
removeStaticNode(vnode)
return
}
const performRemove = () => {
hostRemove(el!)
if (transition && !transition.persisted && transition.afterLeave) {
transition.afterLeave()
}
}
if (
vnode.shapeFlag & ShapeFlags.ELEMENT &&
transition &&
!transition.persisted
) {
const { leave, delayLeave } = transition
const performLeave = () => leave(el!, performRemove)
if (delayLeave) {
delayLeave(vnode.el!, performRemove, performLeave)
} else {
performLeave()
}
} else {
performRemove()
}
}
const removeFragment = (cur: RendererNode, end: RendererNode) => {
// For fragments, directly remove all contained DOM nodes.
// (fragment child nodes cannot have transition)
let next
while (cur !== end) {
next = hostNextSibling(cur)!
hostRemove(cur)
cur = next
}
hostRemove(end)
}
const unmountComponent = (
instance: ComponentInternalInstance,
parentSuspense: SuspenseBoundary | null,
doRemove?: boolean,
) => {
if (__DEV__ && instance.type.__hmrId) {
unregisterHMR(instance)
}
const { bum, scope, job, subTree, um, m, a } = instance
invalidateMount(m)
invalidateMount(a)
// beforeUnmount hook
if (bum) {
invokeArrayFns(bum)
}
if (
__COMPAT__ &&
isCompatEnabled(DeprecationTypes.INSTANCE_EVENT_HOOKS, instance)
) {
instance.emit('hook:beforeDestroy')
}
// stop effects in component scope
scope.stop()
// job may be null if a component is unmounted before its async
// setup has resolved.
if (job) {
// so that scheduler will no longer invoke it
job.flags! |= SchedulerJobFlags.DISPOSED
unmount(subTree, instance, parentSuspense, doRemove)
}
// unmounted hook
if (um) {
queuePostRenderEffect(um, parentSuspense)
}
if (
__COMPAT__ &&
isCompatEnabled(DeprecationTypes.INSTANCE_EVENT_HOOKS, instance)
) {
queuePostRenderEffect(
() => instance.emit('hook:destroyed'),
parentSuspense,
)
}
queuePostRenderEffect(() => {
instance.isUnmounted = true
}, parentSuspense)
// A component with async dep inside a pending suspense is unmounted before
// its async dep resolves. This should remove the dep from the suspense, and
// cause the suspense to resolve immediately if that was the last dep.
if (
__FEATURE_SUSPENSE__ &&
parentSuspense &&
parentSuspense.pendingBranch &&
!parentSuspense.isUnmounted &&
instance.asyncDep &&
!instance.asyncResolved &&
instance.suspenseId === parentSuspense.pendingId
) {
parentSuspense.deps--
if (parentSuspense.deps === 0) {
parentSuspense.resolve()
}
}
if (__DEV__ || __FEATURE_PROD_DEVTOOLS__) {
devtoolsComponentRemoved(instance)
}
}
const unmountChildren: UnmountChildrenFn = (
children,
parentComponent,
parentSuspense,
doRemove = false,
optimized = false,
start = 0,
) => {
for (let i = start; i < children.length; i++) {
unmount(children[i], parentComponent, parentSuspense, doRemove, optimized)
}
}
const getNextHostNode: NextFn = vnode => {
if (vnode.shapeFlag & ShapeFlags.COMPONENT) {
return getNextHostNode(vnode.component!.subTree)
}
if (__FEATURE_SUSPENSE__ && vnode.shapeFlag & ShapeFlags.SUSPENSE) {
return vnode.suspense!.next()
}
const el = hostNextSibling((vnode.anchor || vnode.el)!)
// #9071, #9313
// teleported content can mess up nextSibling searches during patch so
// we need to skip them during nextSibling search
const teleportEnd = el && el[TeleportEndKey]
return teleportEnd ? hostNextSibling(teleportEnd) : el
}
let isFlushing = false
const render: RootRenderFunction = (vnode, container, namespace) => {
if (vnode == null) {
if (container._vnode) {
unmount(container._vnode, null, null, true)
}
} else {
patch(
container._vnode || null,
vnode,
container,
null,
null,
null,
namespace,
)
}
container._vnode = vnode
if (!isFlushing) {
isFlushing = true
flushPreFlushCbs()
flushPostFlushCbs()
isFlushing = false
}
}
const internals: RendererInternals = {
p: patch,
um: unmount,
m: move,
r: remove,
mt: mountComponent,
mc: mountChildren,
pc: patchChildren,
pbc: patchBlockChildren,
n: getNextHostNode,
o: options,
}
let hydrate: ReturnType<typeof createHydrationFunctions>[0] | undefined
let hydrateNode: ReturnType<typeof createHydrationFunctions>[1] | undefined
if (createHydrationFns) {
;[hydrate, hydrateNode] = createHydrationFns(
internals as RendererInternals<Node, Element>,
)
}
return {
render,
hydrate,
createApp: createAppAPI(render, hydrate),
}
}
function resolveChildrenNamespace(
{ type, props }: VNode,
currentNamespace: ElementNamespace,
): ElementNamespace {
return (currentNamespace === 'svg' && type === 'foreignObject') ||
(currentNamespace === 'mathml' &&
type === 'annotation-xml' &&
props &&
props.encoding &&
props.encoding.includes('html'))
? undefined
: currentNamespace
}
function toggleRecurse(
{ effect, job }: ComponentInternalInstance,
allowed: boolean,
) {
if (allowed) {
effect.flags |= EffectFlags.ALLOW_RECURSE
job.flags! |= SchedulerJobFlags.ALLOW_RECURSE
} else {
effect.flags &= ~EffectFlags.ALLOW_RECURSE
job.flags! &= ~SchedulerJobFlags.ALLOW_RECURSE
}
}
export function needTransition(
parentSuspense: SuspenseBoundary | null,
transition: TransitionHooks | null,
): boolean | null {
return (
(!parentSuspense || (parentSuspense && !parentSuspense.pendingBranch)) &&
transition &&
!transition.persisted
)
}
/**
* #1156
* When a component is HMR-enabled, we need to make sure that all static nodes
* inside a block also inherit the DOM element from the previous tree so that
* HMR updates (which are full updates) can retrieve the element for patching.
*
* #2080
* Inside keyed `template` fragment static children, if a fragment is moved,
* the children will always be moved. Therefore, in order to ensure correct move
* position, el should be inherited from previous nodes.
*/
export function traverseStaticChildren(
n1: VNode,
n2: VNode,
shallow = false,
): void {
const ch1 = n1.children
const ch2 = n2.children
if (isArray(ch1) && isArray(ch2)) {
for (let i = 0; i < ch1.length; i++) {
// this is only called in the optimized path so array children are
// guaranteed to be vnodes
const c1 = ch1[i] as VNode
let c2 = ch2[i] as VNode
if (c2.shapeFlag & ShapeFlags.ELEMENT && !c2.dynamicChildren) {
if (c2.patchFlag <= 0 || c2.patchFlag === PatchFlags.NEED_HYDRATION) {
c2 = ch2[i] = cloneIfMounted(ch2[i] as VNode)
c2.el = c1.el
}
if (!shallow && c2.patchFlag !== PatchFlags.BAIL)
traverseStaticChildren(c1, c2)
}
// #6852 also inherit for text nodes
if (c2.type === Text) {
c2.el = c1.el
}
// also inherit for comment nodes, but not placeholders (e.g. v-if which
// would have received .el during block patch)
if (__DEV__ && c2.type === Comment && !c2.el) {
c2.el = c1.el
}
}
}
}
// https://en.wikipedia.org/wiki/Longest_increasing_subsequence
function getSequence(arr: number[]): number[] {
const p = arr.slice()
const result = [0]
let i, j, u, v, c
const len = arr.length
for (i = 0; i < len; i++) {
const arrI = arr[i]
if (arrI !== 0) {
j = result[result.length - 1]
if (arr[j] < arrI) {
p[i] = j
result.push(i)
continue
}
u = 0
v = result.length - 1
while (u < v) {
c = (u + v) >> 1
if (arr[result[c]] < arrI) {
u = c + 1
} else {
v = c
}
}
if (arrI < arr[result[u]]) {
if (u > 0) {
p[i] = result[u - 1]
}
result[u] = i
}
}
}
u = result.length
v = result[u - 1]
while (u-- > 0) {
result[u] = v
v = p[v]
}
return result
}
function locateNonHydratedAsyncRoot(
instance: ComponentInternalInstance,
): ComponentInternalInstance | undefined {
const subComponent = instance.subTree.component
if (subComponent) {
if (subComponent.asyncDep && !subComponent.asyncResolved) {
return subComponent
} else {
return locateNonHydratedAsyncRoot(subComponent)
}
}
}
export function invalidateMount(hooks: LifecycleHook): void {
if (hooks) {
for (let i = 0; i < hooks.length; i++)
hooks[i].flags! |= SchedulerJobFlags.DISPOSED
}
}
|