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Comment,
Component,
ComponentInternalInstance,
DirectiveBinding,
Fragment,
mergeProps,
ssrUtils,
Static,
Text,
VNode,
VNodeArrayChildren,
VNodeProps,
warn
} from 'vue'
import {
escapeHtml,
escapeHtmlComment,
isFunction,
isPromise,
isString,
isVoidTag,
ShapeFlags,
isArray,
NOOP
} from '@vue/shared'
import { ssrRenderAttrs } from './helpers/ssrRenderAttrs'
import { ssrCompile } from './helpers/ssrCompile'
import { ssrRenderTeleport } from './helpers/ssrRenderTeleport'
const {
createComponentInstance,
setCurrentRenderingInstance,
setupComponent,
renderComponentRoot,
normalizeVNode
} = ssrUtils
export type SSRBuffer = SSRBufferItem[] & { hasAsync?: boolean }
export type SSRBufferItem = string | SSRBuffer | Promise<SSRBuffer>
export type PushFn = (item: SSRBufferItem) => void
export type Props = Record<string, unknown>
export type SSRContext = {
[key: string]: any
teleports?: Record<string, string>
__teleportBuffers?: Record<string, SSRBuffer>
}
// Each component has a buffer array.
// A buffer array can contain one of the following:
// - plain string
// - A resolved buffer (recursive arrays of strings that can be unrolled
// synchronously)
// - An async buffer (a Promise that resolves to a resolved buffer)
export function createBuffer() {
let appendable = false
const buffer: SSRBuffer = []
return {
getBuffer(): SSRBuffer {
// Return static buffer and await on items during unroll stage
return buffer
},
push(item: SSRBufferItem) {
const isStringItem = isString(item)
if (appendable && isStringItem) {
buffer[buffer.length - 1] += item as string
} else {
buffer.push(item)
}
appendable = isStringItem
if (isPromise(item) || (isArray(item) && item.hasAsync)) {
// promise, or child buffer with async, mark as async.
// this allows skipping unnecessary await ticks during unroll stage
buffer.hasAsync = true
}
}
}
}
export function renderComponentVNode(
vnode: VNode,
parentComponent: ComponentInternalInstance | null = null,
slotScopeId?: string
): SSRBuffer | Promise<SSRBuffer> {
const instance = createComponentInstance(vnode, parentComponent, null)
const res = setupComponent(instance, true /* isSSR */)
const hasAsyncSetup = isPromise(res)
const prefetches = instance.sp /* LifecycleHooks.SERVER_PREFETCH */
if (hasAsyncSetup || prefetches) {
let p: Promise<unknown> = hasAsyncSetup
? (res as Promise<void>)
: Promise.resolve()
if (prefetches) {
p = p
.then(() =>
Promise.all(prefetches.map(prefetch => prefetch.call(instance.proxy)))
)
// Note: error display is already done by the wrapped lifecycle hook function.
.catch(() => {})
}
return p.then(() => renderComponentSubTree(instance, slotScopeId))
} else {
return renderComponentSubTree(instance, slotScopeId)
}
}
function renderComponentSubTree(
instance: ComponentInternalInstance,
slotScopeId?: string
): SSRBuffer | Promise<SSRBuffer> {
const comp = instance.type as Component
const { getBuffer, push } = createBuffer()
if (isFunction(comp)) {
renderVNode(
push,
(instance.subTree = renderComponentRoot(instance)),
instance,
slotScopeId
)
} else {
if (
(!instance.render || instance.render === NOOP) &&
!instance.ssrRender &&
!comp.ssrRender &&
isString(comp.template)
) {
comp.ssrRender = ssrCompile(comp.template, instance)
}
// perf: enable caching of computed getters during render
// since there cannot be state mutations during render.
for (const e of instance.scope.effects) {
if (e.computed) e.computed._cacheable = true
}
const ssrRender = instance.ssrRender || comp.ssrRender
if (ssrRender) {
// optimized
// resolve fallthrough attrs
let attrs = instance.inheritAttrs !== false ? instance.attrs : undefined
let hasCloned = false
let cur = instance
while (true) {
const scopeId = cur.vnode.scopeId
if (scopeId) {
if (!hasCloned) {
attrs = { ...attrs }
hasCloned = true
}
attrs![scopeId] = ''
}
const parent = cur.parent
if (parent && parent.subTree && parent.subTree === cur.vnode) {
// parent is a non-SSR compiled component and is rendering this
// component as root. inherit its scopeId if present.
cur = parent
} else {
break
}
}
if (slotScopeId) {
Iif (!hasCloned) attrs = { ...attrs }
attrs![slotScopeId.trim()] = ''
}
// set current rendering instance for asset resolution
const prev = setCurrentRenderingInstance(instance)
ssrRender(
instance.proxy,
push,
instance,
attrs,
// compiler-optimized bindings
instance.props,
instance.setupState,
instance.data,
instance.ctx
)
setCurrentRenderingInstance(prev)
} else if (instance.render && instance.render !== NOOP) {
renderVNode(
push,
(instance.subTree = renderComponentRoot(instance)),
instance,
slotScopeId
)
} else {
warn(
`Component ${
comp.name ? `${comp.name} ` : ``
} is missing template or render function.`
)
push(`<!---->`)
}
}
return getBuffer()
}
export function renderVNode(
push: PushFn,
vnode: VNode,
parentComponent: ComponentInternalInstance,
slotScopeId?: string
) {
const { type, shapeFlag, children } = vnode
switch (type) {
case Text:
push(escapeHtml(children as string))
break
case Comment:
push(
children ? `<!--${escapeHtmlComment(children as string)}-->` : `<!---->`
)
break
case Static:
push(children as string)
break
case Fragment:
if (vnode.slotScopeIds) {
slotScopeId =
(slotScopeId ? slotScopeId + ' ' : '') + vnode.slotScopeIds.join(' ')
}
push(`<!--[-->`) // open
renderVNodeChildren(
push,
children as VNodeArrayChildren,
parentComponent,
slotScopeId
)
push(`<!--]-->`) // close
break
default:
if (shapeFlag & ShapeFlags.ELEMENT) {
renderElementVNode(push, vnode, parentComponent, slotScopeId)
} else if (shapeFlag & ShapeFlags.COMPONENT) {
push(renderComponentVNode(vnode, parentComponent, slotScopeId))
} else if (shapeFlag & ShapeFlags.TELEPORT) {
renderTeleportVNode(push, vnode, parentComponent, slotScopeId)
} else if (shapeFlag & ShapeFlags.SUSPENSE) {
renderVNode(push, vnode.ssContent!, parentComponent, slotScopeId)
} else E{
warn(
'[@vue/server-renderer] Invalid VNode type:',
type,
`(${typeof type})`
)
}
}
}
export function renderVNodeChildren(
push: PushFn,
children: VNodeArrayChildren,
parentComponent: ComponentInternalInstance,
slotScopeId: string | undefined
) {
for (let i = 0; i < children.length; i++) {
renderVNode(push, normalizeVNode(children[i]), parentComponent, slotScopeId)
}
}
function renderElementVNode(
push: PushFn,
vnode: VNode,
parentComponent: ComponentInternalInstance,
slotScopeId: string | undefined
) {
const tag = vnode.type as string
let { props, children, shapeFlag, scopeId, dirs } = vnode
let openTag = `<${tag}`
if (dirs) {
props = applySSRDirectives(vnode, props, dirs)
}
if (props) {
openTag += ssrRenderAttrs(props, tag)
}
if (scopeId) {
openTag += ` ${scopeId}`
}
// inherit parent chain scope id if this is the root node
let curParent: ComponentInternalInstance | null = parentComponent
let curVnode = vnode
while (curParent && curVnode === curParent.subTree) {
curVnode = curParent.vnode
if (curVnode.scopeId) {
openTag += ` ${curVnode.scopeId}`
}
curParent = curParent.parent
}
if (slotScopeId) {
openTag += ` ${slotScopeId}`
}
push(openTag + `>`)
if (!isVoidTag(tag)) {
let hasChildrenOverride = false
if (props) {
if (props.innerHTML) {
hasChildrenOverride = true
push(props.innerHTML)
} else if (props.textContent) {
hasChildrenOverride = true
push(escapeHtml(props.textContent))
} else if (tag === 'textarea' && props.value) {
hasChildrenOverride = true
push(escapeHtml(props.value))
}
}
if (!hasChildrenOverride) {
if (shapeFlag & ShapeFlags.TEXT_CHILDREN) {
push(escapeHtml(children as string))
} else if (shapeFlag & ShapeFlags.ARRAY_CHILDREN) {
renderVNodeChildren(
push,
children as VNodeArrayChildren,
parentComponent,
slotScopeId
)
}
}
push(`</${tag}>`)
}
}
function applySSRDirectives(
vnode: VNode,
rawProps: VNodeProps | null,
dirs: DirectiveBinding[]
): VNodeProps {
const toMerge: VNodeProps[] = []
for (let i = 0; i < dirs.length; i++) {
const binding = dirs[i]
const {
dir: { getSSRProps }
} = binding
if (getSSRProps) {
const props = getSSRProps(binding, vnode)
if (props) toMerge.push(props)
}
}
return mergeProps(rawProps || {}, ...toMerge)
}
function renderTeleportVNode(
push: PushFn,
vnode: VNode,
parentComponent: ComponentInternalInstance,
slotScopeId: string | undefined
) {
const target = vnode.props && vnode.props.to
const disabled = vnode.props && vnode.props.disabled
Iif (!target) {
warn(`[@vue/server-renderer] Teleport is missing target prop.`)
return []
}
Iif (!isString(target)) {
warn(
`[@vue/server-renderer] Teleport target must be a query selector string.`
)
return []
}
ssrRenderTeleport(
push,
push => {
renderVNodeChildren(
push,
vnode.children as VNodeArrayChildren,
parentComponent,
slotScopeId
)
},
target,
disabled || disabled === '',
parentComponent
)
}
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