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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 } const isParentCached = parent.type === NodeTypes.ELEMENT && parent.codegenNode && parent.codegenNode.type === NodeTypes.VNODE_CALL && parent.codegenNode.children && !isArray(parent.codegenNode.children) && parent.codegenNode.children.type === NodeTypes.JS_CACHE_EXPRESSION 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), ]) const deleteCount = currentChunk.length - 1 if (isParentCached) { // if the parent is cached, then `children` is also the value of the // CacheExpression. Just replace the corresponding range in the cached // list with staticCall. children.splice( currentIndex - currentChunk.length, currentChunk.length, // @ts-expect-error staticCall, ) } else { // replace the first node's hoisted expression with the static vnode call ;(currentChunk[0].codegenNode as CacheExpression).value = staticCall if (currentChunk.length > 1) { // remove merged nodes from children children.splice(currentIndex - currentChunk.length + 1, deleteCount) // also adjust index for the remaining cache items const cacheIndex = context.cached.indexOf( currentChunk[currentChunk.length - 1] .codegenNode as CacheExpression, ) if (cacheIndex > -1) { for (let i = cacheIndex; i < context.cached.length; i++) { const c = context.cached[i] if (c) c.index -= deleteCount } context.cached.splice(cacheIndex - deleteCount + 1, deleteCount) } } } return deleteCount } return 0 } let i = 0 for (; i < children.length; i++) { const child = children[i] const isCached = isParentCached || getCachedNode(child) if (isCached) { // presence of cached means child must be a stringifiable node const result = analyzeNode(child as StringifiableNode) if (result) { // node is stringifiable, record state nc += result[0] ec += result[1] currentChunk.push(child as StringifiableNode) 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 getCachedNode = ( node: TemplateChildNode, ): CacheExpression | undefined => { if ( ((node.type === NodeTypes.ELEMENT && node.tagType === ElementTypes.ELEMENT) || node.type === NodeTypes.TEXT_CALL) && node.codegenNode && node.codegenNode.type === NodeTypes.JS_CACHE_EXPRESSION ) { return node.codegenNode } } const dataAriaRE = /^(data|aria)-/ const isStringifiableAttr = (name: string, ns: Namespaces) => { return ( (ns === Namespaces.HTML ? isKnownHtmlAttr(name) : ns === Namespaces.SVG ? isKnownSvgAttr(name) : ns === Namespaces.MATH_ML ? isKnownMathMLAttr(name) : false) || dataAriaRE.test(name) ) } const isNonStringifiable = /*@__PURE__*/ makeMap( `caption,thead,tr,th,tbody,td,tfoot,colgroup,col`, ) /** * for a cached 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 { const isOptionTag = node.tag === 'option' && node.ns === Namespaces.HTML 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() } // <option :value="1"> cannot be safely stringified if ( isOptionTag && isStaticArgOf(p.arg, 'value') && p.exp && p.exp.ast && p.exp.ast.type !== 'StringLiteral' ) { 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 { if (isString(node)) { return node } if (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}` let innerHTML = '' 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) { if (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 } // #6568 if ( isBooleanAttr((p.arg as SimpleExpressionNode).content) && exp.content === 'false' ) { 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, )}"` } } else if (p.name === 'html') { // #5439 v-html with constant value // not sure why would anyone do this but it can happen innerHTML = evaluateConstant(p.exp as SimpleExpressionNode) } else if (p.name === 'text') { innerHTML = escapeHtml( toDisplayString(evaluateConstant(p.exp as SimpleExpressionNode)), ) } } } if (context.scopeId) { res += ` ${context.scopeId}` } res += `>` if (innerHTML) { res += innerHTML } else { for (let i = 0; i < node.children.length; i++) { res += stringifyNode(node.children[i], context) } } if (!isVoidTag(node.tag)) { res += `</${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/transforms/transformExpression) 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 { res += evaluateConstant(c as ExpressionNode) } }) return res } } |