关键词: C#、JsonToLua、Json2Lua、对象序列化Lua
前提需引入NewtonsofJson，引入方法可先在Visual Studio 2019
将Newtonsoft.Json.dll文件导入Unity的Plugins下。
Json格式字符串转Lua格式字符串，效果如下：
json字符串
{"1": "asd","2": true,"3": 1.5,"4": 123,"a": {"b": "c","d": [1, 2, 3]}
}lua字符串 (.lua文件一般直接return {}表 故会加上 "return " 如果不需要可以自行修改代码。)
return {[1] = "asd",[2] = true,[3] = 1.5,[4] = 123,a = {b = "c",d = { 1, 2, 3 }}
}使用方法：
string json = "{\"1\":\"asd\",\"2\":true,\"3\":1.5,\"4\":123,\"a\":{\"b\":\"c\",\"d\":[1,2,3]}}";
string lua = Milk.Json.MilkJsonUtility.Json2Lua(json, true);类说明：
LuaObject：封装Json基础类型对象，核心GetString方法返回对象的字符串形式。
LuaTable：封装JsonArray或JsonObject类型对象，主要是将数组或对象内的成员封装为LuaObject存储起来，数组存储于list，对象成员存储于map，核心GetString方法返回表的字符串形式。
LuaTable类静态方法：public static LuaTable CreateFromJson(string json)
由该方法进行转化json为lua，使用JObject.Parse(json)转为Json对象，后经过判断是数组还是对象类型进行使用不同函数转化（JsonArray2LuaTable、JsonObject2LuaTable）
JsonArray2LuaTable：将Json数组成员一一转化为LuaTable
JsonObject2LuaTable：将Json对象成员一一转化为LuaTable
namespace Milk.Json
{public static class MilkJsonUtility{/// <summary>/// 将Json格式字符串转成Lua表形式字符串/// </summary>/// <param name="json"></param>/// <param name="indented">是否缩进</param>/// <returns></returns>public static string Json2Lua(string json, bool indented = false){var table = LuaTable.CreateFromJson(json);return $"return {table.GetString(indented)}";}}
}using System;
using System.Collections.Generic;
using System.Text;namespace Milk.Json
{public enum LuaValueType{Table,String,Num,Boolean,nil}
}using System;
using System.Collections.Generic;
using System.Text;
using Newtonsoft.Json.Linq;namespace Milk.Json
{public class LuaTable{//存放table中的有序部分private List<LuaObject> list = new List<LuaObject>();//存放table中的无序部分private Dictionary<string, LuaObject> map = new Dictionary<string, LuaObject>();//所在层级private int layer = 0;public LuaTable(int _layer){layer = _layer + 1;}#region 有序数组添加/// <summary>/// [有序]添加string value/// </summary>/// <param name="value"></param>public void AddItem(string value){list.Add(new LuaObject(value));}/// <summary>/// [有序]num value/// </summary>/// <param name="value"></param>public void AddItem(int value){list.Add(new LuaObject(value));}/// <summary>/// [有序]num value/// </summary>/// <param name="value"></param>public void AddItem(float value){list.Add(new LuaObject(value));}/// <summary>/// [有序]bool value/// </summary>/// <param name="value"></param>public void AddItem(bool value){list.Add(new LuaObject(value));}public void AddItem(LuaTable value){list.Add(new LuaObject(value));}/// <summary>/// 加入nil/// </summary>public void AddItemNil(){list.Add(new LuaObject());}#endregion#region Key_Value添加public void AddItem(string key, string value){//查重if (!map.ContainsKey(key)){map.Add(key, new LuaObject(value));}}public void AddItem(string key, int value){//查重if (!map.ContainsKey(key)){map.Add(key, new LuaObject(value));}}public void AddItem(string key, float value){//查重if (!map.ContainsKey(key)){map.Add(key, new LuaObject(value));}}public void AddItem(string key, bool value){//查重if (!map.ContainsKey(key)){map.Add(key, new LuaObject(value));}}public void AddItem(string key, LuaTable value){//查重if (!map.ContainsKey(key)){map.Add(key, new LuaObject(value));}}public void AddItemNil(string key){//查重if (!map.ContainsKey(key)){map.Add(key, new LuaObject());}}#endregionprivate bool IsNumeric(string str){int number;return int.TryParse(str, out number);}private string IndentedLayer(string str, bool indented, int change = 0){if (indented){for (int i = 0; i < layer + change; i++){str = "\t" + str;}}return str;}public string GetString(bool indented = false){string str = "{";bool hasList = list.Count > 0;bool hasMap = map.Count > 0;bool isNeedIndented = false;if (indented && (hasList || hasMap)){isNeedIndented = true;if (hasList){LuaValueType type = list[0].GetLuaValueType();if (type == LuaValueType.Boolean || type == LuaValueType.Num){isNeedIndented = false;}}if (isNeedIndented)str += "\n";}if (hasList){int count = 0;foreach (var item in list){count++;if (!isNeedIndented){if (indented && count == 1)str += " ";str += item.GetString(indented);if (count < list.Count)str += ",";if (indented)str += " ";}else{str += IndentedLayer(item.GetString(indented), indented);if (count < list.Count)str += ",";if (indented)str += "\n";}}}if (hasMap){int count = 0;foreach (var item in map){count++;var key = item.Key.Replace('$', '_');if (IsNumeric(key)){key = $"[{key}]";}if (indented)str += IndentedLayer($"{key} = {item.Value.GetString(indented)}", indented);elsestr += IndentedLayer($"{key}={item.Value.GetString(indented)}", indented);if (count < map.Count)str += ",";if (indented)str += "\n";}}if (!isNeedIndented){str += "}";}else{str += IndentedLayer("}", indented, -1);}return str;}public static LuaTable CreateFromJson(string json){var jsonObject = JObject.Parse(json);if (jsonObject.Type == JTokenType.Array){return JsonArray2LuaTable(jsonObject.ToObject<JArray>(), 0);}else{return JsonObject2LuaTable(jsonObject, 0);}}/// <summary>/// 递归方法/// </summary>static LuaTable JsonObject2LuaTable(JObject jsonObj, int layer){var curLuaTable = new LuaTable(layer);//构建无序Table(lua表 key-value形式)foreach (var item in jsonObj){switch (item.Value.Type){case JTokenType.Boolean:curLuaTable.AddItem(item.Key, (bool)item.Value);break;case JTokenType.Array:curLuaTable.AddItem(item.Key, JsonArray2LuaTable(item.Value.ToObject<JArray>(), layer + 1));break;case JTokenType.String:curLuaTable.AddItem(item.Key, (string)item.Value);break;case JTokenType.Date: //转成stringcurLuaTable.AddItem(item.Key, (string)item.Value);break;case JTokenType.Float:curLuaTable.AddItem(item.Key, (float)item.Value);break;case JTokenType.Integer:curLuaTable.AddItem(item.Key, (int)item.Value);break;case JTokenType.None:curLuaTable.AddItemNil(item.Key);break;case JTokenType.Null:curLuaTable.AddItemNil(item.Key);break;case JTokenType.Object:curLuaTable.AddItem(item.Key, JsonObject2LuaTable(item.Value.ToObject<JObject>(), layer + 1));break;case JTokenType.TimeSpan:curLuaTable.AddItem(item.Key, (float)item.Value);break;}}return curLuaTable;}static LuaTable JsonArray2LuaTable(JArray jsonArray, int layer){var curLuaTable = new LuaTable(layer);//构建有序Table(lua表)foreach (var item in jsonArray){//检查子项类型switch (item.Type){case JTokenType.Boolean:curLuaTable.AddItem((bool)item);break;case JTokenType.Array:curLuaTable.AddItem(JsonArray2LuaTable(item.ToObject<JArray>(), layer + 1));break;case JTokenType.String:curLuaTable.AddItem((string)item);break;case JTokenType.Object:curLuaTable.AddItem(JsonObject2LuaTable(item.ToObject<JObject>(), layer + 1));break;case JTokenType.Date:curLuaTable.AddItem((string)item);break;case JTokenType.Float:curLuaTable.AddItem((float)item);break;case JTokenType.Integer:curLuaTable.AddItem((int)item);break;case JTokenType.None:curLuaTable.AddItemNil();break;case JTokenType.Null:curLuaTable.AddItemNil();break;case JTokenType.TimeSpan:curLuaTable.AddItem((float)item);break;}}return curLuaTable;}}
}using System;
using System.Collections.Generic;
using System.Text;namespace Milk.Json
{public class LuaObject{private LuaValueType type;private float valueNumber;private string valueString;private bool valueBoolean;private LuaTable valueTable;public LuaObject(string value){type = LuaValueType.String;valueString = value;}public LuaObject(float value){type = LuaValueType.Num;valueNumber = value;}public LuaObject(int value){type = LuaValueType.Num;valueNumber = value;}public LuaObject(bool value){type = LuaValueType.Boolean;valueBoolean = value;}public LuaObject(LuaTable value){type = LuaValueType.Table;valueTable = value;}public LuaObject(){type = LuaValueType.nil;}public string GetString(bool indented = false){switch (type){case LuaValueType.Table:return valueTable.GetString(indented);//break;case LuaValueType.Boolean:if (valueBoolean){return "true";}else{return "false";}//break;case LuaValueType.Num:return valueNumber.ToString();//break;case LuaValueType.String:return "\""+ valueString+"\"";case LuaValueType.nil:return "nil";default:return "";}}public LuaValueType GetLuaValueType(){return type;}}
}