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/* @flow */
import { def } from 'core/util/lang'
import { normalizeChildren } from 'core/vdom/helpers/normalize-children'
import { emptyObject } from 'shared/util'
import { isAsyncPlaceholder } from './is-async-placeholder'
export function normalizeScopedSlots (
slots: { [key: string]: Function } | void,
normalSlots: { [key: string]: Array<VNode> },
prevSlots?: { [key: string]: Function } | void
): any {
let res
const hasNormalSlots = Object.keys(normalSlots).length > 0
const isStable = slots ? !!slots.$stable : !hasNormalSlots
const key = slots && slots.$key
if (!slots) {
res = {}
} else if (slots._normalized) {
// fast path 1: child component re-render only, parent did not change
return slots._normalized
} else if (
isStable &&
prevSlots &&
prevSlots !== emptyObject &&
key === prevSlots.$key &&
!hasNormalSlots &&
!prevSlots.$hasNormal
) {
// fast path 2: stable scoped slots w/ no normal slots to proxy,
// only need to normalize once
return prevSlots
} else {
res = {}
for (const key in slots) {
if (slots[key] && key[0] !== '$') {
res[key] = normalizeScopedSlot(normalSlots, key, slots[key])
}
}
}
// expose normal slots on scopedSlots
for (const key in normalSlots) {
if (!(key in res)) {
res[key] = proxyNormalSlot(normalSlots, key)
}
}
// avoriaz seems to mock a non-extensible $scopedSlots object
// and when that is passed down this would cause an error
if (slots && Object.isExtensible(slots)) {
(slots: any)._normalized = res
}
def(res, '$stable', isStable)
def(res, '$key', key)
def(res, '$hasNormal', hasNormalSlots)
return res
}
function normalizeScopedSlot(normalSlots, key, fn) {
const normalized = function () {
let res = arguments.length ? fn.apply(null, arguments) : fn({})
res = res && typeof res === 'object' && !Array.isArray(res)
? [res] // single vnode
: normalizeChildren(res)
let vnode: ?VNode = res && res[0]
return res && (
!vnode ||
(res.length === 1 && vnode.isComment && !isAsyncPlaceholder(vnode)) // #9658, #10391
) ? undefined
: res
}
// this is a slot using the new v-slot syntax without scope. although it is
// compiled as a scoped slot, render fn users would expect it to be present
// on this.$slots because the usage is semantically a normal slot.
if (fn.proxy) {
Object.defineProperty(normalSlots, key, {
get: normalized,
enumerable: true,
configurable: true
})
}
return normalized
}
function proxyNormalSlot(slots, key) {
return () => slots[key]
}