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* This module is Node-only.
*/
import {
NodeTypes,
ElementNode,
TransformContext,
TemplateChildNode,
SimpleExpressionNode,
createCallExpression,
HoistTransform,
CREATE_STATIC,
ExpressionNode,
ElementTypes,
PlainElementNode,
JSChildNode,
TextCallNode,
ConstantTypes
} from '@vue/compiler-core'
import {
isVoidTag,
isString,
isSymbol,
isKnownHtmlAttr,
escapeHtml,
toDisplayString,
normalizeClass,
normalizeStyle,
stringifyStyle,
makeMap,
isKnownSvgAttr
} from '@vue/shared'
import { DOMNamespaces } from '../parserOptions'
export const enum StringifyThresholds {
ELEMENT_WITH_BINDING_COUNT = 5,
NODE_COUNT = 20
}
type StringifiableNode = PlainElementNode | TextCallNode
/**
* Regex for replacing placeholders for embedded constant variables
* (e.g. import URL string constants generated by compiler-sfc)
*/
const expReplaceRE = /__VUE_EXP_START__(.*?)__VUE_EXP_END__/g
/**
* Turn eligible hoisted static trees into stringified static nodes, e.g.
*
* ```js
* const _hoisted_1 = createStaticVNode(`<div class="foo">bar</div>`)
* ```
*
* A single static vnode can contain stringified content for **multiple**
* consecutive nodes (element and plain text), called a "chunk".
* `@vue/runtime-dom` will create the content via innerHTML in a hidden
* container element and insert all the nodes in place. The call must also
* provide the number of nodes contained in the chunk so that during hydration
* we can know how many nodes the static vnode should adopt.
*
* The optimization scans a children list that contains hoisted nodes, and
* tries to find the largest chunk of consecutive hoisted nodes before running
* into a non-hoisted node or the end of the list. A chunk is then converted
* into a single static vnode and replaces the hoisted expression of the first
* node in the chunk. Other nodes in the chunk are considered "merged" and
* therefore removed from both the hoist list and the children array.
*
* This optimization is only performed in Node.js.
*/
export const stringifyStatic: HoistTransform = (children, context, parent) => {
// bail stringification for slot content
if (context.scopes.vSlot > 0) {
return
}
let nc = 0 // current node count
let ec = 0 // current element with binding count
const currentChunk: StringifiableNode[] = []
const stringifyCurrentChunk = (currentIndex: number): number => {
if (
nc >= StringifyThresholds.NODE_COUNT ||
ec >= StringifyThresholds.ELEMENT_WITH_BINDING_COUNT
) {
// combine all currently eligible nodes into a single static vnode call
const staticCall = createCallExpression(context.helper(CREATE_STATIC), [
JSON.stringify(
currentChunk.map(node => stringifyNode(node, context)).join('')
).replace(expReplaceRE, `" + $1 + "`),
// the 2nd argument indicates the number of DOM nodes this static vnode
// will insert / hydrate
String(currentChunk.length)
])
// replace the first node's hoisted expression with the static vnode call
replaceHoist(currentChunk[0], staticCall, context)
if (currentChunk.length > 1) {
for (let i = 1; i < currentChunk.length; i++) {
// for the merged nodes, set their hoisted expression to null
replaceHoist(currentChunk[i], null, context)
}
// also remove merged nodes from children
const deleteCount = currentChunk.length - 1
children.splice(currentIndex - currentChunk.length + 1, deleteCount)
return deleteCount
}
}
return 0
}
let i = 0
for (; i < children.length; i++) {
const child = children[i]
const hoisted = getHoistedNode(child)
if (hoisted) {
// presence of hoisted means child must be a stringifiable node
const node = child as StringifiableNode
const result = analyzeNode(node)
if (result) {
// node is stringifiable, record state
nc += result[0]
ec += result[1]
currentChunk.push(node)
continue
}
}
// we only reach here if we ran into a node that is not stringifiable
// check if currently analyzed nodes meet criteria for stringification.
// adjust iteration index
i -= stringifyCurrentChunk(i)
// reset state
nc = 0
ec = 0
currentChunk.length = 0
}
// in case the last node was also stringifiable
stringifyCurrentChunk(i)
}
const getHoistedNode = (node: TemplateChildNode) =>
((node.type === NodeTypes.ELEMENT && node.tagType === ElementTypes.ELEMENT) ||
node.type == NodeTypes.TEXT_CALL) &&
node.codegenNode &&
node.codegenNode.type === NodeTypes.SIMPLE_EXPRESSION &&
node.codegenNode.hoisted
const dataAriaRE = /^(data|aria)-/
const isStringifiableAttr = (name: string, ns: DOMNamespaces) => {
return (
(ns === DOMNamespaces.HTML
? isKnownHtmlAttr(name)
: ns === DOMNamespaces.SVG
? isKnownSvgAttr(name)
: false) || dataAriaRE.test(name)
)
}
const replaceHoist = (
node: StringifiableNode,
replacement: JSChildNode | null,
context: TransformContext
) => {
const hoistToReplace = (node.codegenNode as SimpleExpressionNode).hoisted!
context.hoists[context.hoists.indexOf(hoistToReplace)] = replacement
}
const isNonStringifiable = /*#__PURE__*/ makeMap(
`caption,thead,tr,th,tbody,td,tfoot,colgroup,col`
)
/**
* for a hoisted node, analyze it and return:
* - false: bailed (contains non-stringifiable props or runtime constant)
* - [nc, ec] where
* - nc is the number of nodes inside
* - ec is the number of element with bindings inside
*/
function analyzeNode(node: StringifiableNode): [number, number] | false {
if (node.type === NodeTypes.ELEMENT && isNonStringifiable(node.tag)) {
return false
}
if (node.type === NodeTypes.TEXT_CALL) {
return [1, 0]
}
let nc = 1 // node count
let ec = node.props.length > 0 ? 1 : 0 // element w/ binding count
let bailed = false
const bail = (): false => {
bailed = true
return false
}
// TODO: check for cases where using innerHTML will result in different
// output compared to imperative node insertions.
// probably only need to check for most common case
// i.e. non-phrasing-content tags inside `<p>`
function walk(node: ElementNode): boolean {
for (let i = 0; i < node.props.length; i++) {
const p = node.props[i]
// bail on non-attr bindings
if (
p.type === NodeTypes.ATTRIBUTE &&
!isStringifiableAttr(p.name, node.ns)
) {
return bail()
}
if (p.type === NodeTypes.DIRECTIVE && p.name === 'bind') {
// bail on non-attr bindings
if (
p.arg &&
(p.arg.type === NodeTypes.COMPOUND_EXPRESSION ||
(p.arg.isStatic && !isStringifiableAttr(p.arg.content, node.ns)))
) {
return bail()
}
if (
p.exp &&
(p.exp.type === NodeTypes.COMPOUND_EXPRESSION ||
p.exp.constType < ConstantTypes.CAN_STRINGIFY)
) {
return bail()
}
}
}
for (let i = 0; i < node.children.length; i++) {
nc++
const child = node.children[i]
if (child.type === NodeTypes.ELEMENT) {
if (child.props.length > 0) {
ec++
}
walk(child)
if (bailed) {
return false
}
}
}
return true
}
return walk(node) ? [nc, ec] : false
}
function stringifyNode(
node: string | TemplateChildNode,
context: TransformContext
): string {
Iif (isString(node)) {
return node
}
Iif (isSymbol(node)) {
return ``
}
switch (node.type) {
case NodeTypes.ELEMENT:
return stringifyElement(node, context)
case NodeTypes.TEXT:
return escapeHtml(node.content)
case NodeTypes.COMMENT:
return `<!--${escapeHtml(node.content)}-->`
case NodeTypes.INTERPOLATION:
return escapeHtml(toDisplayString(evaluateConstant(node.content)))
case NodeTypes.COMPOUND_EXPRESSION:
return escapeHtml(evaluateConstant(node))
case NodeTypes.TEXT_CALL:
return stringifyNode(node.content, context)
default:
// static trees will not contain if/for nodes
return ''
}
}
function stringifyElement(
node: ElementNode,
context: TransformContext
): string {
let res = `<${node.tag}`
for (let i = 0; i < node.props.length; i++) {
const p = node.props[i]
if (p.type === NodeTypes.ATTRIBUTE) {
res += ` ${p.name}`
if (p.value) {
res += `="${escapeHtml(p.value.content)}"`
}
} else if (p.type === NodeTypes.DIRECTIVE && p.name === 'bind') {
const exp = p.exp as SimpleExpressionNode
if (exp.content[0] === '_') {
// internally generated string constant references
// e.g. imported URL strings via compiler-sfc transformAssetUrl plugin
res += ` ${(p.arg as SimpleExpressionNode).content}="__VUE_EXP_START__${
exp.content
}__VUE_EXP_END__"`
continue
}
// constant v-bind, e.g. :foo="1"
let evaluated = evaluateConstant(exp)
if (evaluated != null) {
const arg = p.arg && (p.arg as SimpleExpressionNode).content
if (arg === 'class') {
evaluated = normalizeClass(evaluated)
} else if (arg === 'style') {
evaluated = stringifyStyle(normalizeStyle(evaluated))
}
res += ` ${(p.arg as SimpleExpressionNode).content}="${escapeHtml(
evaluated
)}"`
}
}
}
Iif (context.scopeId) {
res += ` ${context.scopeId}`
}
res += `>`
for (let i = 0; i < node.children.length; i++) {
res += stringifyNode(node.children[i], context)
}
if (!isVoidTag(node.tag)) {
res += `</${node.tag}>`
}
return res
}
// __UNSAFE__
// Reason: eval.
// It's technically safe to eval because only constant expressions are possible
// here, e.g. `{{ 1 }}` or `{{ 'foo' }}`
// in addition, constant exps bail on presence of parens so you can't even
// run JSFuck in here. But we mark it unsafe for security review purposes.
// (see compiler-core/src/transformExpressions)
function evaluateConstant(exp: ExpressionNode): string {
if (exp.type === NodeTypes.SIMPLE_EXPRESSION) {
return new Function(`return ${exp.content}`)()
} else {
// compound
let res = ``
exp.children.forEach(c => {
if (isString(c) || isSymbol(c)) {
return
}
if (c.type === NodeTypes.TEXT) {
res += c.content
} else if (c.type === NodeTypes.INTERPOLATION) {
res += toDisplayString(evaluateConstant(c.content))
} else E{
res += evaluateConstant(c)
}
})
return res
}
}
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