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NodeTransform,
NodeTypes,
ElementTypes,
createCallExpression,
resolveComponentType,
buildProps,
ComponentNode,
SlotFnBuilder,
createFunctionExpression,
buildSlots,
FunctionExpression,
TemplateChildNode,
createIfStatement,
createSimpleExpression,
getBaseTransformPreset,
DOMNodeTransforms,
DOMDirectiveTransforms,
createReturnStatement,
ReturnStatement,
Namespaces,
locStub,
RootNode,
TransformContext,
CompilerOptions,
TransformOptions,
createRoot,
createTransformContext,
traverseNode,
ExpressionNode,
TemplateNode,
SUSPENSE,
TELEPORT,
TRANSITION_GROUP,
CREATE_VNODE,
CallExpression,
JSChildNode
} from '@vue/compiler-dom'
import { SSR_RENDER_COMPONENT, SSR_RENDER_VNODE } from '../runtimeHelpers'
import {
SSRTransformContext,
processChildren,
processChildrenAsStatement
} from '../ssrCodegenTransform'
import { ssrProcessTeleport } from './ssrTransformTeleport'
import {
ssrProcessSuspense,
ssrTransformSuspense
} from './ssrTransformSuspense'
import { ssrProcessTransitionGroup } from './ssrTransformTransitionGroup'
import { isSymbol, isObject, isArray } from '@vue/shared'
import { buildSSRProps } from './ssrTransformElement'
// We need to construct the slot functions in the 1st pass to ensure proper
// scope tracking, but the children of each slot cannot be processed until
// the 2nd pass, so we store the WIP slot functions in a weakMap during the 1st
// pass and complete them in the 2nd pass.
const wipMap = new WeakMap<ComponentNode, WIPSlotEntry[]>()
interface WIPSlotEntry {
fn: FunctionExpression
children: TemplateChildNode[]
vnodeBranch: ReturnStatement
}
const componentTypeMap = new WeakMap<
ComponentNode,
string | symbol | CallExpression
>()
// ssr component transform is done in two phases:
// In phase 1. we use `buildSlot` to analyze the children of the component into
// WIP slot functions (it must be done in phase 1 because `buildSlot` relies on
// the core transform context).
// In phase 2. we convert the WIP slots from phase 1 into ssr-specific codegen
// nodes.
export const ssrTransformComponent: NodeTransform = (node, context) => {
if (
node.type !== NodeTypes.ELEMENT ||
node.tagType !== ElementTypes.COMPONENT
) {
return
}
const component = resolveComponentType(node, context, true /* ssr */)
componentTypeMap.set(node, component)
if (isSymbol(component)) {
if (component === SUSPENSE) {
return ssrTransformSuspense(node, context)
}
return // built-in component: fallthrough
}
// Build the fallback vnode-based branch for the component's slots.
// We need to clone the node into a fresh copy and use the buildSlots' logic
// to get access to the children of each slot. We then compile them with
// a child transform pipeline using vnode-based transforms (instead of ssr-
// based ones), and save the result branch (a ReturnStatement) in an array.
// The branch is retrieved when processing slots again in ssr mode.
const vnodeBranches: ReturnStatement[] = []
const clonedNode = clone(node)
return function ssrPostTransformComponent() {
// Using the cloned node, build the normal VNode-based branches (for
// fallback in case the child is render-fn based). Store them in an array
// for later use.
if (clonedNode.children.length) {
buildSlots(clonedNode, context, (props, children) => {
vnodeBranches.push(createVNodeSlotBranch(props, children, context))
return createFunctionExpression(undefined)
})
}
let propsExp: string | JSChildNode = `null`
if (node.props.length) {
// note we are not passing ssr: true here because for components, v-on
// handlers should still be passed
const { props, directives } = buildProps(node, context)
if (props || directives.length) {
propsExp = buildSSRProps(props, directives, context)
}
}
const wipEntries: WIPSlotEntry[] = []
wipMap.set(node, wipEntries)
const buildSSRSlotFn: SlotFnBuilder = (props, children, loc) => {
const fn = createFunctionExpression(
[props || `_`, `_push`, `_parent`, `_scopeId`],
undefined, // no return, assign body later
true, // newline
true, // isSlot
loc
)
wipEntries.push({
fn,
children,
// also collect the corresponding vnode branch built earlier
vnodeBranch: vnodeBranches[wipEntries.length]
})
return fn
}
const slots = node.children.length
? buildSlots(node, context, buildSSRSlotFn).slots
: `null`
if (typeof component !== 'string') {
// dynamic component that resolved to a `resolveDynamicComponent` call
// expression - since the resolved result may be a plain element (string)
// or a VNode, handle it with `renderVNode`.
node.ssrCodegenNode = createCallExpression(
context.helper(SSR_RENDER_VNODE),
[
`_push`,
createCallExpression(context.helper(CREATE_VNODE), [
component,
propsExp,
slots
]),
`_parent`
]
)
} else {
node.ssrCodegenNode = createCallExpression(
context.helper(SSR_RENDER_COMPONENT),
[component, propsExp, slots, `_parent`]
)
}
}
}
export function ssrProcessComponent(
node: ComponentNode,
context: SSRTransformContext
) {
const component = componentTypeMap.get(node)!
if (!node.ssrCodegenNode) {
// this is a built-in component that fell-through.
if (component === TELEPORT) {
return ssrProcessTeleport(node, context)
} else if (component === SUSPENSE) {
return ssrProcessSuspense(node, context)
} else if (component === TRANSITION_GROUP) {
return ssrProcessTransitionGroup(node, context)
} else {
// real fall-through: Transition / KeepAlive
// just render its children.
processChildren(node.children, context)
}
} else {
// finish up slot function expressions from the 1st pass.
const wipEntries = wipMap.get(node) || []
for (let i = 0; i < wipEntries.length; i++) {
const { fn, children, vnodeBranch } = wipEntries[i]
// For each slot, we generate two branches: one SSR-optimized branch and
// one normal vnode-based branch. The branches are taken based on the
// presence of the 2nd `_push` argument (which is only present if the slot
// is called by `_ssrRenderSlot`.
fn.body = createIfStatement(
createSimpleExpression(`_push`, false),
processChildrenAsStatement(
children,
context,
false,
true /* withSlotScopeId */
),
vnodeBranch
)
}
// component is inside a slot, inherit slot scope Id
if (context.withSlotScopeId) {
node.ssrCodegenNode.arguments.push(`_scopeId`)
}
if (typeof component === 'string') {
// static component
context.pushStatement(
createCallExpression(`_push`, [node.ssrCodegenNode])
)
} else {
// dynamic component (`resolveDynamicComponent` call)
// the codegen node is a `renderVNode` call
context.pushStatement(node.ssrCodegenNode)
}
}
}
export const rawOptionsMap = new WeakMap<RootNode, CompilerOptions>()
const [baseNodeTransforms, baseDirectiveTransforms] =
getBaseTransformPreset(true)
const vnodeNodeTransforms = [...baseNodeTransforms, ...DOMNodeTransforms]
const vnodeDirectiveTransforms = {
...baseDirectiveTransforms,
...DOMDirectiveTransforms
}
function createVNodeSlotBranch(
props: ExpressionNode | undefined,
children: TemplateChildNode[],
parentContext: TransformContext
): ReturnStatement {
// apply a sub-transform using vnode-based transforms.
const rawOptions = rawOptionsMap.get(parentContext.root)!
const subOptions = {
...rawOptions,
// overwrite with vnode-based transforms
nodeTransforms: [
...vnodeNodeTransforms,
...(rawOptions.nodeTransforms || [])
],
directiveTransforms: {
...vnodeDirectiveTransforms,
...(rawOptions.directiveTransforms || {})
}
}
// wrap the children with a wrapper template for proper children treatment.
const wrapperNode: TemplateNode = {
type: NodeTypes.ELEMENT,
ns: Namespaces.HTML,
tag: 'template',
tagType: ElementTypes.TEMPLATE,
isSelfClosing: false,
// important: provide v-slot="props" on the wrapper for proper
// scope analysis
props: [
{
type: NodeTypes.DIRECTIVE,
name: 'slot',
exp: props,
arg: undefined,
modifiers: [],
loc: locStub
}
],
children,
loc: locStub,
codegenNode: undefined
}
subTransform(wrapperNode, subOptions, parentContext)
return createReturnStatement(children)
}
function subTransform(
node: TemplateChildNode,
options: TransformOptions,
parentContext: TransformContext
) {
const childRoot = createRoot([node])
const childContext = createTransformContext(childRoot, options)
// this sub transform is for vnode fallback branch so it should be handled
// like normal render functions
childContext.ssr = false
// inherit parent scope analysis state
childContext.scopes = { ...parentContext.scopes }
childContext.identifiers = { ...parentContext.identifiers }
childContext.imports = parentContext.imports
// traverse
traverseNode(childRoot, childContext)
// merge helpers/components/directives into parent context
;(['helpers', 'components', 'directives'] as const).forEach(key => {
childContext[key].forEach((value: any, helperKey: any) => {
if (key === 'helpers') {
const parentCount = parentContext.helpers.get(helperKey)
if (parentCount === undefined) {
parentContext.helpers.set(helperKey, value)
} else {
parentContext.helpers.set(helperKey, value + parentCount)
}
} else {
;(parentContext[key] as any).add(value)
}
})
})
// imports/hoists are not merged because:
// - imports are only used for asset urls and should be consistent between
// node/client branches
// - hoists are not enabled for the client branch here
}
function clone(v: any): any {
if (isArray(v)) {
return v.map(clone)
} else if (isObject(v)) {
const res: any = {}
for (const key in v) {
res[key] = clone(v[key])
}
return res
} else {
return v
}
}
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