Added a ToLua derive macro #427

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ArchangelJTW wants to merge 17 commits into mlua-rs:main

from ArchangelJTW:to_lua_macro

Open

Added a ToLua derive macro #427

ArchangelJTW wants to merge 17 commits into mlua-rs:main from ArchangelJTW:to_lua_macro

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@ArchangelJTW

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@ArchangelJTW ArchangelJTW commented Jul 12, 2024 •

edited

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I just made it but it seems useful so far, at least for me it is, works with most primitives so I think it's worth adding to help reduce boilerplate:

use mlua::{FromLua, Function, Lua, LuaOptions, StdLib, ToLua};
use serde::{Deserialize, Serialize};
#[derive(Debug, Serialize, Deserialize, FromLua, Clone, ToLua)] // new ToLua derive macro
struct MyType {
 x: u32,
 y: String,
}
fn main() {
 let lua = Lua::new_with(StdLib::ALL_SAFE, LuaOptions::default()).unwrap();
 
 let lua_code = r#"
 function(myType)
 print(myType.x, myType.y)
 end
 "#;
 let f: Function = lua.load(lua_code).eval().unwrap();
 let my_type = MyType {
 x: 6,
 y: "hi, from rust to lua".into()
 };
 f.call::<MyType, ()>(my_type).unwrap();
}

joshw added 2 commits

July 12, 2024 18:37


 Added a ToLua macro, early stages

80b1ecd


 updated to use userdata instead of table

71a0399

@ArchangelJTW

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ArchangelJTW commented Jul 13, 2024 •

edited

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I updated it to implement UserData instead of IntoLua, this works more cleanly with passing the type in and out of lua, it will use copy on rust primitives, otherwise it will clone. It could probably be updated to include field annotations of some kind in order to be more customizable and efficient. It currently creates a simple getter and setter for all the struct fields.