revert: roll back to ccf6c03 state (composite sub-questions preserved)

Reverts the following commits that broke composite question handling:
- 85661a5 auto-detect composite sub-questions from text patterns
- 064b3cf use slice to preserve full content when wrapping selections
- 2562de7 remove isolating to allow nested question blocks

Restores the working state from ccf6c03 where:
- wrapInQuestion fails gracefully in isolating nodes
- selected text is preserved when creating sub-questions
- composite question structure is intact

src/modules/exams/components/exam-rich-form.tsx

@@ -180,6 +180,24 @@ export function ExamRichForm() {
     ? editorDocToStructure(editorDoc, values.title)
     : null
 
+  // 调试:查看复合题的子题解析结果
+  if (previewStructure && typeof window !== "undefined") {
+    const composites = previewStructure.questions.filter((q) => q.type === "composite")
+    if (composites.length > 0) {
+      // eslint-disable-next-line no-console
+      console.log("[ExamPreview] composites:", composites.map((q) => ({
+        id: q.id,
+        textLength: q.content.text.length,
+        textPreview: q.content.text.slice(0, 80),
+        subQuestionCount: q.content.subQuestions?.length ?? 0,
+        subQuestions: q.content.subQuestions?.map((s) => ({
+          text: s.text.slice(0, 50),
+          score: s.score,
+        })),
+      })))
+    }
+  }
+
   return (
     <form onSubmit={handleSubmit} className="space-y-4">
       {/* 顶部工具栏:基本信息(单行) + AI 自动标记 + 保存 */}

src/modules/exams/editor/editor-to-structure.ts

@@ -11,19 +11,7 @@ import type {
 const extractText = (node: JSONContent | undefined): string => {
   if (!node) return ""
   if (node.type === "text") return node.text ?? ""
-  if (Array.isArray(node.content)) {
-    // 段落之间插入换行符,避免不同段落文本被直接连接
-    return node.content
-      .map((child) => {
-        const text = extractText(child)
-        // 段落/列表项后加换行,保持文本结构
-        if (child.type === "paragraph" || child.type === "listItem") {
-          return text + "\n"
-        }
-        return text
-      })
-      .join("")
-  }
+  if (Array.isArray(node.content)) return node.content.map(extractText).join("")
   return ""
 }
 
@@ -118,14 +106,15 @@ const buildQuestion = (qb: JSONContent): EditorQuestion => {
     return true
   })
 
-  // 提取题干文本(过滤掉列表和图片,它们单独处理)
-  const textNodes = nonQuestionBlocks.filter(
+  const text = extractText({
+    type: "doc",
+    content: nonQuestionBlocks.filter(
       (n) =>
         n.type !== "orderedList" &&
         n.type !== "bulletList" &&
         n.type !== "image"
-  )
-  const text = extractText({ type: "doc", content: textNodes })
+    ),
+  })
   const options = parseOptions(nonQuestionBlocks)
   const blanks = collectBlanks(nonQuestionBlocks)
   const images = collectImages(nonQuestionBlocks)
@@ -134,112 +123,9 @@ const buildQuestion = (qb: JSONContent): EditorQuestion => {
   if (blanks.length > 0) content.blanks = blanks
   if (images.length > 0) content.images = images
   if (subQuestions.length > 0) content.subQuestions = subQuestions
-
-  // 复合题:如果没有显式子题,尝试从文本模式识别子题
-  // (如 "1.xxx", "2.xxx", "(1)xxx", "①xxx" 等)
-  if (type === "composite" && subQuestions.length === 0 && content.text) {
-    const detected = detectSubQuestionsFromText(content.text)
-    if (detected.length > 0) {
-      content.subQuestions = detected
-      // 移除被识别为子题的文本,保留选段/材料部分
-      const materialText = extractMaterialText(content.text, detected)
-      content.text = materialText
-    }
-  }
-
   return { id, type, score, content }
 }
 
-/**
- * 从文本中检测子题(如 "1.xxx", "2.xxx", "(1)xxx", "①xxx" 等)
- * 返回检测到的子题列表(不含原文中的材料部分)
- *
- * 检测策略:
- * 1. 优先识别带编号的行(1.xxx, (1)xxx, ①xxx 等)
- * 2. 如果检测到编号子题,且其前一行带分值(如"xxx（3分）"),
- *    则把前一行也作为子题1
- */
-const detectSubQuestionsFromText = (
-  text: string
-): Array<{ id: string; text: string; score?: number }> => {
-  const lines = text.split("\n").map((l) => l.trim()).filter(Boolean)
-  const subQuestionPattern = /^(?:\(?(\d+)\)?|①|②|③|④|⑤|⑥|⑦|⑧|⑨|⑩)[.、)）]?\s*(.+)/
-  const scorePattern = /[（(](\d+)\s*分[）)]/
-  const subs: Array<{ id: string; text: string; score?: number }> = []
-
-  // 先找所有带编号的子题
-  const numberedIndices: number[] = []
-  for (let i = 0; i < lines.length; i++) {
-    if (lines[i].match(subQuestionPattern)) {
-      numberedIndices.push(i)
-    }
-  }
-
-  if (numberedIndices.length === 0) return []
-
-  // 如果第一个编号子题前面有带分值的行,把它们也作为子题
-  const firstNumberedIdx = numberedIndices[0]
-  if (firstNumberedIdx > 0) {
-    // 检查前一行是否带分值(可能是未编号的子题1)
-    for (let i = firstNumberedIdx - 1; i >= 0; i--) {
-      const line = lines[i]
-      const scoreMatch = line.match(scorePattern)
-      if (scoreMatch && line.length < 100) {
-        // 短行 + 带分值 = 可能是子题
-        subs.unshift({
-          id: createId(),
-          text: line,
-          score: Number(scoreMatch[1]),
-        })
-      } else {
-        break
-      }
-    }
-  }
-
-  // 处理带编号的子题
-  let currentSub: { id: string; text: string } | null = null
-  for (let i = firstNumberedIdx; i < lines.length; i++) {
-    const line = lines[i]
-    const match = line.match(subQuestionPattern)
-    if (match) {
-      if (currentSub) subs.push(currentSub)
-      const content = match[2] || ""
-      const scoreMatch = content.match(scorePattern)
-      const score = scoreMatch ? Number(scoreMatch[1]) : undefined
-      currentSub = { id: createId(), text: content }
-      if (score !== undefined) {
-        subs.push({ ...currentSub, score })
-        currentSub = null
-      }
-    } else if (currentSub) {
-      currentSub.text += "\n" + line
-    }
-  }
-  if (currentSub) subs.push(currentSub)
-
-  return subs
-}
-
-/**
- * 从原文中提取材料文本(移除被识别为子题的部分)
- */
-const extractMaterialText = (
-  fullText: string,
-  subs: Array<{ id: string; text: string }>
-): string => {
-  let material = fullText
-  for (const sub of subs) {
-    // 移除子题文本(取第一行作为匹配依据)
-    const firstLine = sub.text.split("\n")[0]
-    if (firstLine) {
-      material = material.replace(firstLine, "")
-    }
-  }
-  // 清理多余的空行
-  return material.replace(/\n{3,}/g, "\n\n").trim()
-}
-
 /** 统计结构节点的题目数和总分(递归) */
 const computeStats = (node: EditorStructureNode): { count: number; score: number } => {
   if (node.type === "question") {

src/modules/exams/editor/extensions/group-block.tsx

@@ -80,6 +80,7 @@ export const GroupBlock = Node.create({
   group: "block",
   content: "block+",
   defining: true,
+  isolating: true,
   addAttributes() {
     return {
       title: { default: "" },

src/modules/exams/editor/extensions/question-block.tsx

@@ -64,6 +64,7 @@ export const QuestionBlock = Node.create({
   group: "block",
   content: "block+",
   defining: true,
+  isolating: true,
   addAttributes() {
     return {
       questionId: { default: "" },

src/modules/exams/editor/extensions/section-block.tsx

@@ -86,6 +86,7 @@ export const SectionBlock = Node.create({
   group: "block",
   content: "block+",
   defining: true,
+  isolating: true,
   addAttributes() {
     return {
       title: { default: "" },

src/modules/exams/editor/selection-toolbar.tsx

@@ -151,40 +151,43 @@ export function SelectionToolbar({
   const insertQuestion = (type: QuestionBlockType) => {
     const score = type === "composite" ? 5 : 2
     if (hasTextSelection) {
-      // 用 slice 获取选区内的完整节点结构(保留段落/列表/图片等),
-      // 然后用 questionBlock 包裹这些内容。这比 wrapIn 更可靠,
-      // 因为 wrapIn 在选区跨越多个段落或部分段落时可能失败或丢失内容。
+      // 先尝试 wrapIn(普通情况下可用)
+      const wrapped = editor.commands.wrapInQuestion({ type, score })
+      if (!wrapped) {
+        // wrapIn 失败(通常在 isolating 节点如复合题块内):
+        // 获取选中文本,删除选区,插入包含选中文本的 questionBlock
+        // 这样不会清空内容,而是把选中文本转为新的子题
         const { from, to } = editor.state.selection
-      const slice = editor.state.doc.slice(from, to)
-      const sliceContent = slice.content.toJSON
-        ? (slice.content.toJSON() as unknown[])
-        : Array.isArray(slice.content.content)
-          ? slice.content.content.map((n) => n.toJSON())
-          : []
-
-      // 确保 content: "block+" 满足(非空)
-      const validContent =
-        sliceContent.length > 0
-          ? sliceContent
+        const selectedText = editor.state.doc.textBetween(from, to, "\n")
+        const lines = selectedText
+          .split("\n")
+          .filter((l) => l.trim().length > 0)
+        const content = lines.length > 0
+          ? lines.map((line) => ({
+              type: "paragraph",
+              content: [{ type: "text", text: line }],
+            }))
           : [{ type: "paragraph", content: [{ type: "text", text: " " }] }]
 
         editor.chain()
           .focus()
-        .deleteRange({ from, to })
-        .insertContentAt(from, {
+          .deleteSelection()
+          .insertContent({
             type: "questionBlock",
             attrs: { type, score, questionId: "" },
-          content: validContent,
+            content,
           })
           .run()
+      }
     } else {
       // 未选中文本时:插入空题目块
       editor.chain().focus().insertQuestion({ type, score }).run()
     }
   }
 
-  /** 通用包裹:用 slice 获取选区完整节点结构,包裹到指定节点中 */
-  const wrapSelection = (
+  /** 通用降级包裹:wrapIn 失败时,把选中文本转为指定节点 */
+  const wrapOrInsert = (
+    wrapFn: () => boolean,
     insertFn: () => void,
     nodeType: "groupBlock" | "sectionBlock",
     attrs: Record<string, unknown>,
@@ -194,33 +197,34 @@ export function SelectionToolbar({
       insertFn()
       return
     }
-    // 用 slice 获取选区内的完整节点结构,确保不丢失内容
+    const wrapped = wrapFn()
+    if (!wrapped) {
+      // wrapIn 失败:获取选中文本,删除选区,插入包含选中文本的节点
       const { from, to } = editor.state.selection
-    const slice = editor.state.doc.slice(from, to)
-    const sliceContent = slice.content.toJSON
-      ? (slice.content.toJSON() as unknown[])
-      : Array.isArray(slice.content.content)
-        ? slice.content.content.map((n) => n.toJSON())
-        : []
-
-    const validContent =
-      sliceContent.length > 0
-        ? sliceContent
+      const selectedText = editor.state.doc.textBetween(from, to, "\n")
+      const lines = selectedText.split("\n").filter((l) => l.trim().length > 0)
+      const content = lines.length > 0
+        ? lines.map((line) => ({
+            type: "paragraph",
+            content: [{ type: "text", text: line }],
+          }))
         : [{ type: "paragraph", content: [{ type: "text", text: " " }] }]
 
       editor.chain()
         .focus()
-      .deleteRange({ from, to })
-      .insertContentAt(from, {
+        .deleteSelection()
+        .insertContent({
           type: nodeType,
           attrs: { ...attrs, title: defaultTitle },
-        content: validContent,
+          content,
         })
         .run()
     }
+  }
 
   const insertGroup = () => {
-    wrapSelection(
+    wrapOrInsert(
+      () => editor.commands.wrapInGroup("一、选择题", ""),
       () => editor.chain().focus().insertGroup("一、选择题", "").run(),
       "groupBlock",
       { instruction: "" },
@@ -229,7 +233,8 @@ export function SelectionToolbar({
   }
 
   const insertSection = () => {
-    wrapSelection(
+    wrapOrInsert(
+      () => editor.commands.wrapInSection("第Ⅰ卷 选择题", 1),
       () => editor.chain().focus().insertSection("第Ⅰ卷 选择题", 1).run(),
       "sectionBlock",
       { level: 1 },