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type BlockStatement,
type CallExpression,
type CompilerError,
type CompilerOptions,
ElementTypes,
type IfStatement,
type JSChildNode,
NodeTypes,
type RootNode,
type TemplateChildNode,
type TemplateLiteral,
createBlockStatement,
createCallExpression,
createCompoundExpression,
createRoot,
createSimpleExpression,
createTemplateLiteral,
createTransformContext,
isText,
processExpression,
} from '@vue/compiler-dom'
import { escapeHtml, isString } from '@vue/shared'
import { SSR_INTERPOLATE, ssrHelpers } from './runtimeHelpers'
import { ssrProcessIf } from './transforms/ssrVIf'
import { ssrProcessFor } from './transforms/ssrVFor'
import { ssrProcessSlotOutlet } from './transforms/ssrTransformSlotOutlet'
import { ssrProcessComponent } from './transforms/ssrTransformComponent'
import { ssrProcessElement } from './transforms/ssrTransformElement'
import { SSRErrorCodes, createSSRCompilerError } from './errors'
// Because SSR codegen output is completely different from client-side output
// (e.g. multiple elements can be concatenated into a single template literal
// instead of each getting a corresponding call), we need to apply an extra
// transform pass to convert the template AST into a fresh JS AST before
// passing it to codegen.
export function ssrCodegenTransform(
ast: RootNode,
options: CompilerOptions,
): void {
const context = createSSRTransformContext(ast, options)
// inject SFC <style> CSS variables
// we do this instead of inlining the expression to ensure the vars are
// only resolved once per render
if (options.ssrCssVars) {
const cssContext = createTransformContext(createRoot([]), options)
const varsExp = processExpression(
createSimpleExpression(options.ssrCssVars, false),
cssContext,
)
context.body.push(
createCompoundExpression([`const _cssVars = { style: `, varsExp, `}`]),
)
Array.from(cssContext.helpers.keys()).forEach(helper => {
ast.helpers.add(helper)
})
}
const isFragment =
ast.children.length > 1 && ast.children.some(c => !isText(c))
processChildren(ast, context, isFragment)
ast.codegenNode = createBlockStatement(context.body)
// Finalize helpers.
// We need to separate helpers imported from 'vue' vs. '@vue/server-renderer'
ast.ssrHelpers = Array.from(
new Set([
...Array.from(ast.helpers).filter(h => h in ssrHelpers),
...context.helpers,
]),
)
ast.helpers = new Set(Array.from(ast.helpers).filter(h => !(h in ssrHelpers)))
}
export interface SSRTransformContext {
root: RootNode
options: CompilerOptions
body: (JSChildNode | IfStatement)[]
helpers: Set<symbol>
withSlotScopeId: boolean
onError: (error: CompilerError) => void
helper<T extends symbol>(name: T): T
pushStringPart(part: TemplateLiteral['elements'][0]): void
pushStatement(statement: IfStatement | CallExpression): void
}
function createSSRTransformContext(
root: RootNode,
options: CompilerOptions,
helpers: Set<symbol> = new Set(),
withSlotScopeId = false,
): SSRTransformContext {
const body: BlockStatement['body'] = []
let currentString: TemplateLiteral | null = null
return {
root,
options,
body,
helpers,
withSlotScopeId,
onError:
options.onError ||
(e => {
throw e
}),
helper<T extends symbol>(name: T): T {
helpers.add(name)
return name
},
pushStringPart(part) {
if (!currentString) {
const currentCall = createCallExpression(`_push`)
body.push(currentCall)
currentString = createTemplateLiteral([])
currentCall.arguments.push(currentString)
}
const bufferedElements = currentString.elements
const lastItem = bufferedElements[bufferedElements.length - 1]
if (isString(part) && isString(lastItem)) {
bufferedElements[bufferedElements.length - 1] += part
} else {
bufferedElements.push(part)
}
},
pushStatement(statement) {
// close current string
currentString = null
body.push(statement)
},
}
}
function createChildContext(
parent: SSRTransformContext,
withSlotScopeId = parent.withSlotScopeId,
): SSRTransformContext {
// ensure child inherits parent helpers
return createSSRTransformContext(
parent.root,
parent.options,
parent.helpers,
withSlotScopeId,
)
}
interface Container {
children: TemplateChildNode[]
}
export function processChildren(
parent: Container,
context: SSRTransformContext,
asFragment = false,
disableNestedFragments = false,
disableComment = false,
): void {
if (asFragment) {
context.pushStringPart(`<!--[-->`)
}
const { children } = parent
for (let i = 0; i < children.length; i++) {
const child = children[i]
switch (child.type) {
case NodeTypes.ELEMENT:
switch (child.tagType) {
case ElementTypes.ELEMENT:
ssrProcessElement(child, context)
break
case ElementTypes.COMPONENT:
ssrProcessComponent(child, context, parent)
break
case ElementTypes.SLOT:
ssrProcessSlotOutlet(child, context)
break
case ElementTypes.TEMPLATE:
// TODO
break
default:
context.onError(
createSSRCompilerError(
SSRErrorCodes.X_SSR_INVALID_AST_NODE,
(child as any).loc,
),
)
// make sure we exhaust all possible types
const exhaustiveCheck: never = child
return exhaustiveCheck
}
break
case NodeTypes.TEXT:
context.pushStringPart(escapeHtml(child.content))
break
case NodeTypes.COMMENT:
// no need to escape comment here because the AST can only
// contain valid comments.
if (!disableComment) {
context.pushStringPart(`<!--${child.content}-->`)
}
break
case NodeTypes.INTERPOLATION:
context.pushStringPart(
createCallExpression(context.helper(SSR_INTERPOLATE), [
child.content,
]),
)
break
case NodeTypes.IF:
ssrProcessIf(child, context, disableNestedFragments, disableComment)
break
case NodeTypes.FOR:
ssrProcessFor(child, context, disableNestedFragments)
break
case NodeTypes.IF_BRANCH:
// no-op - handled by ssrProcessIf
break
case NodeTypes.TEXT_CALL:
case NodeTypes.COMPOUND_EXPRESSION:
// no-op - these two types can never appear as template child node since
// `transformText` is not used during SSR compile.
break
default:
context.onError(
createSSRCompilerError(
SSRErrorCodes.X_SSR_INVALID_AST_NODE,
(child as any).loc,
),
)
// make sure we exhaust all possible types
const exhaustiveCheck: never = child
return exhaustiveCheck
}
}
if (asFragment) {
context.pushStringPart(`<!--]-->`)
}
}
export function processChildrenAsStatement(
parent: Container,
parentContext: SSRTransformContext,
asFragment = false,
withSlotScopeId: boolean = parentContext.withSlotScopeId,
): BlockStatement {
const childContext = createChildContext(parentContext, withSlotScopeId)
processChildren(parent, childContext, asFragment)
return createBlockStatement(childContext.body)
}
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