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import {
VNode,
VNodeNormalizedChildren,
normalizeVNode,
VNodeChild,
InternalObjectKey
} from './vnode'
import {
isArray,
isFunction,
EMPTY_OBJ,
ShapeFlags,
extend,
def,
SlotFlags
} from '@vue/shared'
import { warn } from './warning'
import { isKeepAlive } from './components/KeepAlive'
import { ContextualRenderFn, withCtx } from './componentRenderContext'
import { isHmrUpdating } from './hmr'
import { DeprecationTypes, isCompatEnabled } from './compat/compatConfig'
import { toRaw } from '@vue/reactivity'
export type Slot = (...args: any[]) => VNode[]
export type InternalSlots = {
[name: string]: Slot | undefined
}
export type Slots = Readonly<InternalSlots>
export type RawSlots = {
[name: string]: unknown
// manual render fn hint to skip forced children updates
$stable?: boolean
/**
* for tracking slot owner instance. This is attached during
* normalizeChildren when the component vnode is created.
* @internal
*/
_ctx?: ComponentInternalInstance | null
/**
* indicates compiler generated slots
* we use a reserved property instead of a vnode patchFlag because the slots
* object may be directly passed down to a child component in a manual
* render function, and the optimization hint need to be on the slot object
* itself to be preserved.
* @internal
*/
_?: SlotFlags
}
const isInternalKey = (key: string) => key[0] === '_' || key === '$stable'
const normalizeSlotValue = (value: unknown): VNode[] =>
isArray(value)
? value.map(normalizeVNode)
: [normalizeVNode(value as VNodeChild)]
const normalizeSlot = (
key: string,
rawSlot: Function,
ctx: ComponentInternalInstance | null | undefined
): Slot => {
const normalized = withCtx((...args: any[]) => {
Iif (__DEV__ && currentInstance) {
warn(
`Slot "${key}" invoked outside of the render function: ` +
`this will not track dependencies used in the slot. ` +
`Invoke the slot function inside the render function instead.`
)
}
return normalizeSlotValue(rawSlot(...args))
}, ctx) as Slot
// NOT a compiled slot
;(normalized as ContextualRenderFn)._c = false
return normalized
}
const normalizeObjectSlots = (
rawSlots: RawSlots,
slots: InternalSlots,
instance: ComponentInternalInstance
) => {
const ctx = rawSlots._ctx
for (const key in rawSlots) {
if (isInternalKey(key)) continue
const value = rawSlots[key]
if (isFunction(value)) {
slots[key] = normalizeSlot(key, value, ctx)
} else if (value != null) {
if (
__DEV__ &&
!(
__COMPAT__ &&
isCompatEnabled(DeprecationTypes.RENDER_FUNCTION, instance)
)
) {
warn(
`Non-function value encountered for slot "${key}". ` +
`Prefer function slots for better performance.`
)
}
const normalized = normalizeSlotValue(value)
slots[key] = () => normalized
}
}
}
const normalizeVNodeSlots = (
instance: ComponentInternalInstance,
children: VNodeNormalizedChildren
) => {
if (
__DEV__ &&
!isKeepAlive(instance.vnode) &&
!(__COMPAT__ && isCompatEnabled(DeprecationTypes.RENDER_FUNCTION, instance))
) {
warn(
`Non-function value encountered for default slot. ` +
`Prefer function slots for better performance.`
)
}
const normalized = normalizeSlotValue(children)
instance.slots.default = () => normalized
}
export const initSlots = (
instance: ComponentInternalInstance,
children: VNodeNormalizedChildren
) => {
if (instance.vnode.shapeFlag & ShapeFlags.SLOTS_CHILDREN) {
const type = (children as RawSlots)._
if (type) {
// users can get the shallow readonly version of the slots object through `this.$slots`,
// we should avoid the proxy object polluting the slots of the internal instance
instance.slots = toRaw(children as InternalSlots)
// make compiler marker non-enumerable
def(children as InternalSlots, '_', type)
} else {
normalizeObjectSlots(
children as RawSlots,
(instance.slots = {}),
instance
)
}
} else {
instance.slots = {}
if (children) {
normalizeVNodeSlots(instance, children)
}
}
def(instance.slots, InternalObjectKey, 1)
}
export const updateSlots = (
instance: ComponentInternalInstance,
children: VNodeNormalizedChildren,
optimized: boolean
) => {
const { vnode, slots } = instance
let needDeletionCheck = true
let deletionComparisonTarget = EMPTY_OBJ
if (vnode.shapeFlag & ShapeFlags.SLOTS_CHILDREN) {
const type = (children as RawSlots)._
if (type) {
// compiled slots.
if (__DEV__ && isHmrUpdating) {
// Parent was HMR updated so slot content may have changed.
// force update slots and mark instance for hmr as well
extend(slots, children as Slots)
} else Iif (optimized && type === SlotFlags.STABLE) {
// compiled AND stable.
// no need to update, and skip stale slots removal.
needDeletionCheck = false
} else {
// compiled but dynamic (v-if/v-for on slots) - update slots, but skip
// normalization.
extend(slots, children as Slots)
// #2893
// when rendering the optimized slots by manually written render function,
// we need to delete the `slots._` flag if necessary to make subsequent updates reliable,
// i.e. let the `renderSlot` create the bailed Fragment
if (!optimized && type === SlotFlags.STABLE) {
delete slots._
}
}
} else {
needDeletionCheck = !(children as RawSlots).$stable
normalizeObjectSlots(children as RawSlots, slots, instance)
}
deletionComparisonTarget = children as RawSlots
} else if (children) {
// non slot object children (direct value) passed to a component
normalizeVNodeSlots(instance, children)
deletionComparisonTarget = { default: 1 }
}
// delete stale slots
if (needDeletionCheck) {
for (const key in slots) {
if (!isInternalKey(key) && !(key in deletionComparisonTarget)) {
delete slots[key]
}
}
}
}
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