Flutter Json解析工具

import 'dart:convert';
import 'dart:io';

Future main() async {
  String filePath = "D:\\FlutterProject\\suzhou_bridge_2023\\lib\\services"
      "\\frequent_inspection\\frequent_inspection_disease_data_test.dart";
  var file = File(filePath);

  List classNames = [];

  Stream> inputStream = file.openRead();
  List trueLines = [];

  var lines = utf8.decoder
      .bind(inputStream)
      .transform(const LineSplitter());
  try {
    await for (final line in lines) {
      trueLines.add(line);
      if(RegExp(r'class [a-zA-Z0-9]* extends Object').hasMatch(line)){
        classNames.add(line.split(" ")[1]);
      }
    }
    // print(classNames);
    // print(trueLines);
    String fileStr = "import 'dart:core';\nimport 'package:json_annotation/json_annotation.dart';\n\n";
    for(var className in classNames){
      fileStr = fileStr+_getClassAndPara(className,trueLines);
    }
    // print(fileStr);
    await file.delete();
    try{
      File file2 = File(filePath);
      await file2.writeAsString(fileStr);
    }catch (e) {
      // print(e);
    }
  } catch (e) {
    // print(e);
  }
}

String _getClassAndPara(String classN,List trueLines){
  int startMark = 0;
  int endMark = 0;
  List paras = [];
  for(int i=0;i').hasMatch(para)){
      fromJson = "$fromJson  ${para.split(" ")[0]} ${para.split(" ")[1]};\n";
      fromJson = "$fromJson  if(json['${para.split(" ")[1]}'] == null){\n    ${para.split(" ")[1]} = [];\n  }\n";
      if(para.contains("String?")){
        fromJson = "$fromJson  else{\n    ${para.split(" ")[1]} = (json['${para.split(" ")[1]}'] as List).map((e) => e == null? null:e as String).toList();\n  }\n\n";
      }
      else if(para.contains("int?")){
        fromJson = "$fromJson  else{\n    ${para.split(" ")[1]} = (json['${para.split(" ")[1]}'] as List).map((e) => e == null? null:e as int).toList();\n  }\n\n";
      }
      else if(para.contains("double?")){
        fromJson = "$fromJson  else{\n    ${para.split(" ")[1]} = (json['${para.split(" ")[1]}'] as List).map((e) => e == null? null:e as double).toList();\n  }\n\n";
      }
      else if(para.contains("bool?")){
        fromJson = "$fromJson  else{\n    ${para.split(" ")[1]} = (json['${para.split(" ")[1]}'] as List).map((e) => e == null? null:e as bool).toList();\n  }\n\n";
      }
      else{
        fromJson = "$fromJson  else{\n    ${para.split(" ")[1]} = (json['${para.split(" ")[1]}'] as List).map((e) => e == null? null:${para.split(" ")[0].split("<")[1].split("?")[0]}.fromJson(e as Map)).toList();\n  }\n\n";
      }
    }
  }

  fromJson = "$fromJson  return $classN(\n";


  for(var para in paras){
    if(RegExp(r'List<[a-zA-Z]*\??>').hasMatch(para)){
      fromJson = "$fromJson    ${para.split(" ")[1]},\n";
    }else if(para.contains("String?")||para.contains("int?")||para.contains("double?")||para.contains("bool?")){
      fromJson = "$fromJson    json['${para.split(" ")[1]}'],\n";
    }else{
      fromJson = "$fromJson    ${para.split("?").first}.fromJson(json['${para.split(" ")[1]}']),\n";
    }
    toJson = "$toJson        '${para.split(" ")[1]}': instance.${para.split(" ")[1]},\n";
  }
  fromJson = "$fromJson  );\n}\n";
  toJson = "$toJson    };\n\n";


  String lastStr = "";
  for(int i=startMark;i 
import 'dart:convert';
import 'dart:io';
 
Future<void> main() async {
  String filePath = "D:\\FlutterProject\\suzhou_bridge_2023\\lib\\services"
      "\\frequent_inspection\\frequent_inspection_disease_data_test.dart";
  var file = File(filePath);
 
  List<String> classNames = [];
 
  Stream<List<int>> inputStream = file.openRead();
  List<String> trueLines = [];
 
  var lines = utf8.decoder
      .bind(inputStream)
      .transform(const LineSplitter());
  try {
    await for (final line in lines) {
      trueLines.add(line);
      if(RegExp(r'class [a-zA-Z0-9]* extends Object').hasMatch(line)){
        classNames.add(line.split(" ")[1]);
      }
    }
    // print(classNames);
    // print(trueLines);
    String fileStr = "import 'dart:core';\nimport 'package:json_annotation/json_annotation.dart';\n\n";
    for(var className in classNames){
      fileStr = fileStr+_getClassAndPara(className,trueLines);
    }
    // print(fileStr);
    await file.delete();
    try{
      File file2 = File(filePath);
      await file2.writeAsString(fileStr);
    }catch (e) {
      // print(e);
    }
  } catch (e) {
    // print(e);
  }
}
 
String _getClassAndPara(String classN,List<String> trueLines){
  int startMark = 0;
  int endMark = 0;
  List<String> paras = [];
  for(int i=0;i
    if(trueLines[i].contains(classN) && trueLines[i-1].contains("@JsonSerializable()")){
      startMark = i-2;
      // startMark = i-1;
      break;
    }
  }
  for(int i=startMark;i
    if(trueLines[i].contains("}")){
      endMark = i;
      break;
    }
  }
  // print(startMark);
  // print(endMark);
 
  for(int i=startMark;i<=endMark;i++){
    if(trueLines[i].contains("@JsonKey()") && i
      paras.add(trueLines[i+1].trim().replaceAll(";", ""));
    }
  }
  // print(paras);
 
  String factory1 = "  factory $classN.fromJson(Map json)=> _\$${classN}FromJson(json);\n";
  String factory2 = "  Map toJson() => _\$${classN}ToJson(this);\n}\n";
 
  String fromJson = "$classN _\$${classN}FromJson(Map json){\n";
  String toJson = "Map _\$${classN}ToJson($classN instance) =>\n    {\n";
 
  // print(paras);
 
  for(var para in paras){
    print(para);
    /// 首先匹配List的情况
    // if(para.contains("List")){
    if(RegExp(r'List<[a-zA-Z]*\??>').hasMatch(para)){
      fromJson = "$fromJson  ${para.split(" ")[0]} ${para.split(" ")[1]};\n";
      fromJson = "$fromJson  if(json['${para.split(" ")[1]}'] == null){\n    ${para.split(" ")[1]} = [];\n  }\n";
      if(para.contains("String?")){
        fromJson = "$fromJson  else{\n    ${para.split(" ")[1]} = (json['${para.split(" ")[1]}'] as List).map((e) => e == null? null:e as String).toList();\n  }\n\n";
      }
      else if(para.contains("int?")){
        fromJson = "$fromJson  else{\n    ${para.split(" ")[1]} = (json['${para.split(" ")[1]}'] as List).map((e) => e == null? null:e as int).toList();\n  }\n\n";
      }
      else if(para.contains("double?")){
        fromJson = "$fromJson  else{\n    ${para.split(" ")[1]} = (json['${para.split(" ")[1]}'] as List).map((e) => e == null? null:e as double).toList();\n  }\n\n";
      }
      else if(para.contains("bool?")){
        fromJson = "$fromJson  else{\n    ${para.split(" ")[1]} = (json['${para.split(" ")[1]}'] as List).map((e) => e == null? null:e as bool).toList();\n  }\n\n";
      }
      else{
        fromJson = "$fromJson  else{\n    ${para.split(" ")[1]} = (json['${para.split(" ")[1]}'] as List).map((e) => e == null? null:${para.split(" ")[0].split("<")[1].split("?")[0]}.fromJson(e as Map)).toList();\n  }\n\n";
      }
    }
  }
 
  fromJson = "$fromJson  return $classN(\n";
 
 
  for(var para in paras){
    if(RegExp(r'List<[a-zA-Z]*\??>').hasMatch(para)){
      fromJson = "$fromJson    ${para.split(" ")[1]},\n";
    }else if(para.contains("String?")||para.contains("int?")||para.contains("double?")||para.contains("bool?")){
      fromJson = "$fromJson    json['${para.split(" ")[1]}'],\n";
    }else{
      fromJson = "$fromJson    ${para.split("?").first}.fromJson(json['${para.split(" ")[1]}']),\n";
    }
    toJson = "$toJson        '${para.split(" ")[1]}': instance.${para.split(" ")[1]},\n";
  }
  fromJson = "$fromJson  );\n}\n";
  toJson = "$toJson    };\n\n";
 
 
  String lastStr = "";
  for(int i=startMark;i
    lastStr = "$lastStr${trueLines[i]}\n";
  }
  // print(lastStr + factory1+factory2+"\n"+fromJson+"\n"+toJson);
  return ("$lastStr$factory1$factory2\n$fromJson\n$toJson");
  // print(toJson);
 
}