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import {
type Props,
type PushFn,
type SSRBufferItem,
renderVNodeChildren,
} from '../render'
import { isArray } from '@vue/shared'
const { ensureValidVNode } = ssrUtils
export type SSRSlots = Record<string, SSRSlot>
export type SSRSlot = (
props: Props,
push: PushFn,
parentComponent: ComponentInternalInstance | null,
scopeId: string | null,
) => void
export function ssrRenderSlot(
slots: Slots | SSRSlots,
slotName: string,
slotProps: Props,
fallbackRenderFn: (() => void) | null,
push: PushFn,
parentComponent: ComponentInternalInstance,
slotScopeId?: string,
): void {
// template-compiled slots are always rendered as fragments
push(`<!--[-->`)
ssrRenderSlotInner(
slots,
slotName,
slotProps,
fallbackRenderFn,
push,
parentComponent,
slotScopeId,
)
push(`<!--]-->`)
}
export function ssrRenderSlotInner(
slots: Slots | SSRSlots,
slotName: string,
slotProps: Props,
fallbackRenderFn: (() => void) | null,
push: PushFn,
parentComponent: ComponentInternalInstance,
slotScopeId?: string,
transition?: boolean,
): void {
const slotFn = slots[slotName]
if (slotFn) {
const slotBuffer: SSRBufferItem[] = []
const bufferedPush = (item: SSRBufferItem) => {
slotBuffer.push(item)
}
const ret = slotFn(
slotProps,
bufferedPush,
parentComponent,
slotScopeId ? ' ' + slotScopeId : '',
)
if (isArray(ret)) {
const validSlotContent = ensureValidVNode(ret)
if (validSlotContent) {
// normal slot
renderVNodeChildren(
push,
validSlotContent,
parentComponent,
slotScopeId,
)
} else if (fallbackRenderFn) {
fallbackRenderFn()
} else if (transition) {
push(`<!---->`)
}
} else {
// ssr slot.
// check if the slot renders all comments, in which case use the fallback
let isEmptySlot = true
if (transition) {
isEmptySlot = false
} else {
for (let i = 0; i < slotBuffer.length; i++) {
if (!isComment(slotBuffer[i])) {
isEmptySlot = false
break
}
}
}
if (isEmptySlot) {
if (fallbackRenderFn) {
fallbackRenderFn()
}
} else {
// #9933
// Although we handle Transition/TransitionGroup in the transform stage
// without rendering it as a fragment, the content passed into the slot
// may still be a fragment.
// Therefore, here we need to avoid rendering it as a fragment again.
let start = 0
let end = slotBuffer.length
if (
transition &&
slotBuffer[0] === '<!--[-->' &&
slotBuffer[end - 1] === '<!--]-->'
) {
start++
end--
}
if (start < end) {
for (let i = start; i < end; i++) {
push(slotBuffer[i])
}
} else if (transition) {
push(`<!---->`)
}
}
}
} else if (fallbackRenderFn) {
fallbackRenderFn()
} else if (transition) {
push(`<!---->`)
}
}
const commentTestRE = /^<!--[\s\S]*-->$/
const commentRE = /<!--[^]*?-->/gm
function isComment(item: SSRBufferItem) {
if (typeof item !== 'string' || !commentTestRE.test(item)) return false
// if item is '<!---->' or '<!--[-->' or '<!--]-->', return true directly
if (item.length <= 8) return true
return !item.replace(commentRE, '').trim()
}
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