René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[ENH] Add LuaObject(UserData)","articleBody":"### Description\r\nI want to add easy UserData support to GmodDotNet\r\n\r\n`LuaObject` is a inheritable class that allows to push and pop c#-style userdata. It already implements some basic metamethods such as `__gc` and `__tostring`, with virtual methods `Destroy` and `Name` for child classes to override.\r\nAt the module startup, every class inherited from `LuaObject` and with `[UserData(string Name)]` attribute would be registered.\r\nRegistering luaobject consists of steps:\r\n\r\n1. Create metatable using `lua.CreateMetatable` using name from `[UserData]` attribute\r\n2. Write TypeName, TypeId from `CreateMetaTable` and Type to internal Dictionary\r\n3. Get all static methods with signature `int (ILua lua)` and `[MetaMethod]` attribute from the class and push them as metamethods\r\n4. Create table and push all static methods with the same signature but without `[MetaMethod]` attribute\r\n5. Make new table an `__index` for metatable\r\n\r\n### Usage\r\nCreating LuaObject\r\n```cs\r\n    [UserData(Name = \"MyLuaObject\")]\r\n    public class MyLuaObject : LuaObject\u003cMyLuaObject\u003e\r\n    {\r\n        public override string Name() =\u003e \"MyLuaObject\";\r\n        public override void Destroy() =\u003e Console.WriteLine(\"Garbage collected!\");\r\n        public int SomeInt = 5;\r\n        private static int ReturnNumber(ILua lua)\r\n        {\r\n            var self = Pop(lua);\r\n            lua.PushNumber(self.SomeInt);\r\n            return 1;\r\n        }\r\n    }\r\n```\r\n\r\nPushing and poping\r\n```cs\r\n    int SomePushLuaMethod(ILua lua)\r\n    {\r\n        MyLuaObject obj = new MyLuaObject();\r\n        obj.Push(lua);\r\n        return 1;\r\n    }\r\n    int SomePopLuaMethod(ILua lua)\r\n    {\r\n        MyLuaObject obj = MyLuaObject.Pop(1); // Pop first argument\r\n        Console.WriteLine(obj.SomeInt);\r\n    }\r\n```\r\nUsage in lua is as follows:\r\n```lua\r\n    local myObj = SomePushLuaMethod()\r\n    print(myObj:ReturnNumber())\r\n    SomePopLuaMethod(myObj) -- 5 in console\r\n    myObj = nil --__gc would be called, also calling Destroy virtual method\r\n```","author":{"url":"https://github.com/JenyaRostov","@type":"Person","name":"JenyaRostov"},"datePublished":"2021-06-04T19:37:04.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/1/Extensions/issues/1"}