feat(compiler-vapor): invalid html nesting

packages/compiler-vapor/__tests__/transforms/__snapshots__/transformElement.spec.ts.snap

@@ -10,9 +10,11 @@ export function render(_ctx) {
 `;
 
 exports[`compiler: element transform > component > generate multi root component 1`] = `
-"import { createComponent as _createComponent } from 'vue/vapor';
+"import { createComponent as _createComponent, template as _template } from 'vue/vapor';
+const t0 = _template("123")
 
 export function render(_ctx) {
+  const n1 = t0()
   const n0 = _createComponent(_ctx.Comp)
   return [n0, n1]
 }"
@@ -168,6 +170,23 @@ export function render(_ctx) {
 }"
 `;
 
+exports[`compiler: element transform > invalid html nesting 1`] = `
+"import { insert as _insert, template as _template } from 'vue/vapor';
+const t0 = _template("<div>123</div>")
+const t1 = _template("<p></p>")
+const t2 = _template("<form></form>")
+
+export function render(_ctx) {
+  const n1 = t1()
+  const n0 = t0()
+  const n3 = t2()
+  const n2 = t2()
+  _insert(n0, n1)
+  _insert(n2, n3)
+  return [n1, n3]
+}"
+`;
+
 exports[`compiler: element transform > props + children 1`] = `
 "import { template as _template } from 'vue/vapor';
 const t0 = _template("<div id=\\"foo\\"><span></span></div>")

packages/compiler-vapor/__tests__/transforms/transformElement.spec.ts

@@ -3,6 +3,7 @@ import {
   IRNodeTypes,
   transformChildren,
   transformElement,
+  transformText,
   transformVBind,
   transformVOn,
 } from '../../src'
@@ -13,7 +14,7 @@ import {
 } from '@vue/compiler-core'
 
 const compileWithElementTransform = makeCompile({
-  nodeTransforms: [transformElement, transformChildren],
+  nodeTransforms: [transformElement, transformChildren, transformText],
   directiveTransforms: {
     bind: transformVBind,
     on: transformVOn,
@@ -689,4 +690,24 @@ describe('compiler: element transform', () => {
     ])
     expect(code).contains('_setDynamicEvents(n0, _ctx.obj)')
   })
+
+  test('invalid html nesting', () => {
+    const { code, ir } = compileWithElementTransform(
+      `<p><div>123</div></p>
+      <form><form/></form>`,
+    )
+    expect(code).toMatchSnapshot()
+    expect(ir.template).toEqual(['<div>123</div>', '<p></p>', '<form></form>'])
+    expect(ir.block.dynamic).toMatchObject({
+      children: [
+        { id: 1, template: 1, children: [{ id: 0, template: 0 }] },
+        { id: 3, template: 2, children: [{ id: 2, template: 2 }] },
+      ],
+    })
+
+    expect(ir.block.operation).toMatchObject([
+      { type: IRNodeTypes.INSERT_NODE, parent: 1, elements: [0] },
+      { type: IRNodeTypes.INSERT_NODE, parent: 3, elements: [2] },
+    ])
+  })
 })

packages/compiler-vapor/package.json

@@ -39,6 +39,7 @@
   "dependencies": {
     "@vue/compiler-dom": "workspace:*",
     "@vue/shared": "workspace:*",
-    "source-map-js": "^1.0.2"
+    "source-map-js": "^1.0.2",
+    "validate-html-nesting": "^1.2.2"
   }
 }

packages/compiler-vapor/src/transform.ts

@@ -78,7 +78,8 @@ export interface TransformContext<T extends AllNode = AllNode> {
   enterBlock(ir: TransformContext['block'], isVFor?: boolean): () => void
   reference(): number
   increaseId(): number
-  registerTemplate(): number
+  pushTemplate(template: string): number
+  registerTemplate(customTemplate?: string): number
   registerEffect(
     expressions: SimpleExpressionNode[],
     operation: OperationNode[],
@@ -133,6 +134,7 @@ function createRootContext(
       inVFor && this.inVFor++
       return () => {
         // exit
+        this.registerTemplate()
         this.block = block
         this.template = template
         this.dynamic = dynamic
@@ -180,20 +182,16 @@ function createRootContext(
 
     template: '',
     childrenTemplate: [],
+    pushTemplate(content) {
+      const existing = root.template.findIndex(template => template === content)
+      if (existing !== -1) return existing
+      root.template.push(content)
+      return root.template.length - 1
+    },
     registerTemplate() {
-      if (!this.template) {
-        return -1
-      }
-
-      const existing = root.template.findIndex(
-        template => template === this.template,
-      )
-      if (existing !== -1) {
-        return (this.dynamic.template = existing)
-      }
-
-      root.template.push(this.template)
-      return (this.dynamic.template = root.template.length - 1)
+      if (!this.template) return -1
+      const id = this.pushTemplate(this.template)
+      return (this.dynamic.template = id)
     },
     registerOperation(...node) {
       this.block.operation.push(...node)

packages/compiler-vapor/src/transforms/transformElement.ts

@@ -1,3 +1,4 @@
+import { isValidHTMLNesting } from 'validate-html-nesting'
 import {
   type AttributeNode,
   type ElementNode,
@@ -44,9 +45,8 @@ export const transformElement: NodeTransform = (node, context) => {
         (node.tagType === ElementTypes.ELEMENT ||
           node.tagType === ElementTypes.COMPONENT)
       )
-    ) {
+    )
       return
-    }
 
     const { tag, tagType } = node
     const isComponent = tagType === ElementTypes.COMPONENT
@@ -59,7 +59,7 @@ export const transformElement: NodeTransform = (node, context) => {
     ;(isComponent ? transformComponentElement : transformNativeElement)(
       tag,
       propsResult,
-      context,
+      context as TransformContext<ElementNode>,
     )
   }
 }
@@ -121,12 +121,14 @@ function resolveSetupReference(name: string, context: TransformContext) {
 function transformNativeElement(
   tag: string,
   propsResult: ReturnType<typeof buildProps>,
-  context: TransformContext,
+  context: TransformContext<ElementNode>,
 ) {
   const { scopeId } = context.options
 
-  context.template += `<${tag}`
-  if (scopeId) context.template += ` ${scopeId}`
+  let template = ''
+
+  template += `<${tag}`
+  if (scopeId) template += ` ${scopeId}`
 
   if (propsResult[0] /* dynamic props */) {
     const [, dynamicArgs, expressions] = propsResult
@@ -141,8 +143,8 @@ function transformNativeElement(
     for (const prop of propsResult[1]) {
       const { key, values } = prop
       if (key.isStatic && values.length === 1 && values[0].isStatic) {
-        context.template += ` ${key.content}`
-        if (values[0].content) context.template += `="${values[0].content}"`
+        template += ` ${key.content}`
+        if (values[0].content) template += `="${values[0].content}"`
       } else {
         context.registerEffect(values, [
           {
@@ -155,10 +157,22 @@ function transformNativeElement(
     }
   }
 
-  context.template += `>` + context.childrenTemplate.join('')
+  template += `>` + context.childrenTemplate.join('')
   // TODO remove unnecessary close tag, e.g. if it's the last element of the template
   if (!isVoidTag(tag)) {
-    context.template += `</${tag}>`
+    template += `</${tag}>`
+  }
+
+  if (
+    context.parent &&
+    context.parent.node.type === NodeTypes.ELEMENT &&
+    !isValidHTMLNesting(context.parent.node.tag, tag)
+  ) {
+    context.reference()
+    context.dynamic.template = context.pushTemplate(template)
+    context.dynamic.flags |= DynamicFlag.INSERT | DynamicFlag.NON_TEMPLATE
+  } else {
+    context.template += template
   }
 }
 

packages/compiler-vapor/src/transforms/vFor.ts

@@ -64,7 +64,6 @@ export function processFor(
   context.reference()
 
   return () => {
-    context.registerTemplate()
     exitBlock()
     context.registerOperation({
       type: IRNodeTypes.FOR,

packages/compiler-vapor/src/transforms/vIf.ts

@@ -128,9 +128,5 @@ export function createIfBranch(
 
   const exitBlock = context.enterBlock(branch)
   context.reference()
-  const onExit = () => {
-    context.registerTemplate()
-    exitBlock()
-  }
-  return [branch, onExit]
+  return [branch, exitBlock]
 }

pnpm-lock.yaml

@@ -292,6 +292,9 @@ importers:
       source-map-js:
         specifier: ^1.0.2
         version: 1.0.2
+      validate-html-nesting:
+        specifier: ^1.2.2
+        version: 1.2.2
 
   packages/dts-built-test:
     dependencies:
@@ -5968,6 +5971,10 @@ packages:
   /util-deprecate@1.0.2:
     resolution: {integrity: sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==}
 
+  /validate-html-nesting@1.2.2:
+    resolution: {integrity: sha512-hGdgQozCsQJMyfK5urgFcWEqsSSrK63Awe0t/IMR0bZ0QMtnuaiHzThW81guu3qx9abLi99NEuiaN6P9gVYsNg==}
+    dev: false
+
   /validate-npm-package-license@3.0.4:
     resolution: {integrity: sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==}
     dependencies: