# All files / modules/book-generator/parsers subsection.parser.ts

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     /**
     * 小节解析器
     * 容错解析LLM返回的小节大纲JSON
     */

    export function parseSubsections(jsonStr: string): { subsections: any[] } | null {
      if (!jsonStr || typeof jsonStr !== 'string') {
        console.error('[SubsectionParser] 输入为空或非字符串');
        return null;
      }

      try {
        let data: any;
        let cleanedStr = jsonStr.trim();

        // 调试：打印前80个字符
        console.log('[SubsectionParser] 原始前80字符:', JSON.stringify(cleanedStr.substring(0, 80)));

        // 清理 JSON 字符串中的非法控制字符
        cleanedStr = cleanedStr.replace(/[\x00-\x1F\x7F]/g, (char) => {
          // 将控制字符替换为空格（换行符会导致JSON解析失败）
          return ' ';
        });

        // 移除 markdown 代码块标记
        cleanedStr = cleanedStr.replace(/```json\s*/gi, '').replace(/```\s*/g, '').trim();

        // 移除思考标签
        cleanedStr = cleanedStr.replace(/^[\s\S]*?<blockquote>\s*[\s\S]*?<\/blockquote>\s*/, '');
        // 如果以 开头，说明思考标签在JSON之前，需要移除
        // 修复：</think>是结束标签，</think>是开始标签
        const thinkEndIdx = cleanedStr.indexOf('</think>');
        if (thinkEndIdx !== -1) {
          cleanedStr = cleanedStr.substring(thinkEndIdx + 8).trim();
        }

        console.log('[SubsectionParser] 处理后前100字符:', JSON.stringify(cleanedStr.substring(0, 100)));

        try {
          data = JSON.parse(cleanedStr);
        } catch {
          // 使用括号计数法提取JSON对象
          const firstBrace = cleanedStr.indexOf('{');
          if (firstBrace === -1) {
            console.error('[SubsectionParser] 未找到 JSON 对象');
            return null;
          }
          let jsonCandidate = '';
          let depth = 0;
          let started = false;
          for (let i = firstBrace; i < cleanedStr.length; i++) {
            const ch = cleanedStr[i];
            if (ch === '{') {
              depth++;
              started = true;
            } else if (ch === '}') {
              depth--;
            }
            if (started) jsonCandidate += ch;
            if (started && depth === 0) break;
          }
          if (!jsonCandidate) {
            console.error('[SubsectionParser] JSON 对象提取失败');
            return null;
          }
          try {
            data = JSON.parse(jsonCandidate);
          } catch (parseErr) {
            console.error('[SubsectionParser] JSON 解析失败:', parseErr);
            return null;
          }
        }

        if (!data || typeof data !== 'object') {
          console.error('[SubsectionParser] 解析结果非对象');
          return null;
        }

        // 兼容：如果顶层就是数组
        if (Array.isArray(data)) {
          data = { subsections: data };
        }

        // 兼容多种字段名：subsections, Subsections, subsection_list 等
        let subsectionsArray = data.subsections || data.Subsections || data.subsection_list || data.section_subsections;

        if (!Array.isArray(subsectionsArray)) {
          console.error('[SubsectionParser] subsections 字段缺失或非数组');
          return null;
        }

        return {
          subsections: subsectionsArray.map((s: any, i: number) => ({
            number: s.number || i + 1,
            title: s.title || `第${i + 1}小节`,
            summary: typeof s.summary === 'string' ? s.summary : '',
            keyPoints: Array.isArray(s.keyPoints) ? s.keyPoints : [],
            estimatedWords: typeof s.estimatedWords === 'number' ? s.estimatedWords : 500,
          })),
        };
      } catch (err) {
        console.error('[SubsectionParser] 未知错误:', err);
        return null;
      }
    }