kitchen/scripts/test_json_debug_clean.dart

// 2026-04-25 | test_json_debug_clean.dart | 详细调试 _cleanJsonContent
import 'dart:io';
import 'dart:convert';

void main() {
  final path = r'e:\program files (x86)\wegame\apps\2821981550\filerecv\小妈厨房 - 数据导出(1).json';
  
  print('📁 读取文件...\n');
  final bytes = File(path).readAsBytesSync();
  var content = utf8.decode(bytes, allowMalformed: true);
  
  print('原始内容:');
  print('  长度: ${content.length}');
  print('  最后一个字符: "${content[content.length - 1]}" (${content.codeUnitAt(content.length - 1)})');
  print('');
  
  // 模拟 _cleanJsonContentPage 的每一步
  print('🧹 执行 _cleanJsonContentPage:\n');
  
  // 步骤1: 移除BOM
  content = content.replaceFirst(RegExp('^\\uFEFF'), '');
  print('步骤1 - 移除BOM后长度: ${content.length}');
  print('');
  
  // 步骤2: 检查最后一个 }
  final lastBrace = content.lastIndexOf('}');
  print('步骤2 - 最后一个 } 在位置: $lastBrace (总长度: ${content.length})');
  
  if (lastBrace >= 0 && lastBrace < content.length - 1) {
    final trailing = content.substring(lastBrace + 1).trim();
    print('  } 之后的内容: "$trailing" (${trailing.length}字符)');
    print('  内容的hex编码:');
    for (var i = 0; i < (trailing).length; i++) {
      print('    [$i] U+${trailing.codeUnitAt(i).toRadixString(16).toUpperCase().padLeft(4, '0')} "${trailing[i]}"');
    }
    
    if (trailing.isNotEmpty &&
        !trailing.startsWith(',') &&
        !trailing.startsWith('}') &&
        !trailing.startsWith(']')) {
      print('  ⚠️ 将截取到位置 ${lastBrace + 1}');
      content = content.substring(0, lastBrace + 1);
      print('  截取后长度: ${content.length}');
    } else {
      print('  ✅ 不需要截取');
    }
  } else if (lastBrace == content.length - 1) {
    print('  ✅ 最后一个字符就是 }');
  } else {
    print('  ❌ 没有找到 }');
  }
  print('');
  
  // 步骤3: 检查最后一个 ]
  final lastBracket = content.lastIndexOf(']');
  print('步骤3 - 最后一个 ] 在位置: $lastBracket (当前长度: ${content.length})');
  
  if (lastBracket >= 0 && lastBracket < content.length - 1) {
    final trailing = content.substring(lastBracket + 1).trim();
    print('  ] 之后的内容: "$trailing" (${trailing.length}字符)');
    
    if (trailing.isNotEmpty) {
      print('  ⚠️ 将截取到位置 ${lastBracket + 1}');
      content = content.substring(0, lastBracket + 1);
      print('  截取后长度: ${content.length}');
    } else {
      print('  ✅ 不需要截取');
    }
  } else if (lastBracket == content.length - 1) {
    print('  ✅ 最后一个字符就是 ]');
  } else {
    print('  ❌ 没有找到 ]');
  }
  print('');
  
  // 步骤4: 移除控制字符
  final beforeControl = content.length;
  content = content.replaceAll(RegExp(r'[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]'), '');
  if (content.length != beforeControl) {
    print('步骤4 - 移除了 ${beforeControl - content.length} 个控制字符');
  } else {
    print('步骤4 - 无控制字符需要移除');
  }
  print('');
  
  // 步骤5: trim
  final beforeTrim = content.length;
  content = content.trim();
  if (content.length != beforeTrim) {
    print('步骤5 - trim移除了 ${beforeTrim - content.length} 个空白字符');
  } else {
    print('步骤5 - 无空白字符需要trim');
  }
  print('');
  
  // 最终结果
  print('✅ 最终结果:');
  print('  长度: ${content.length}');
  print('  最后10个字符: ...${content.length > 10 ? content.substring(content.length - 10) : content}');
  print('');
  
  // 尝试解析
  print('🔍 尝试 jsonDecode...');
  try {
    final decoded = jsonDecode(content);
    print('✅ 解析成功!');
    
    if (decoded is Map<String, dynamic>) {
      print('  Keys: ${decoded.keys.join(', ')}');
      
      // 检查浏览记录
      if (decoded.containsKey('browse_history')) {
        final history = decoded['browse_history'];
        if (history is List) {
          print('  浏览记录数: ${history.length}');
        }
      }
    }
  } catch (e) {
    print('❌ 解析失败: $e');
    print('');
    
    // 显示错误位置的上下文
    final lines = content.split('\n');
    print('  总行数: ${lines.length}');
    
    final lineMatch = RegExp(r'line (\d+)').firstMatch(e.toString());
    final charMatch = RegExp(r'character (\d+)').firstMatch(e.toString());
    
    if (lineMatch != null) {
      final errorLine = int.tryParse(lineMatch.group(1) ?? '0') ?? 0;
      final errorChar = int.tryParse(charMatch?.group(1) ?? '0') ?? 0;
      
      print('  错误位置: 第${errorLine}行, 第${errorChar}个字符');
      
      if (errorLine > 0 && errorLine <= lines.length) {
        print('  该行内容: "${lines[errorLine - 1]}"');
        
        // 括号平衡检查
        var braceCount = 0;
        var bracketCount = 0;
        for (var i = 0; i < errorLine; i++) {
          final line = lines[i];
          for (var j = 0; j < line.length; j++) {
            final char = line[j];
            if (char == '{') braceCount++;
            if (char == '}') braceCount--;
            if (char == '[') bracketCount++;
            if (char == ']') bracketCount--;
          }
        }
        
        print('  到该行前的括号平衡: {=$braceCount [=$bracketCount');
      }
    }
  }
}