47 lines
1.5 KiB
Rust
47 lines
1.5 KiB
Rust
use proc_macro2::TokenStream;
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use quote::quote;
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use syn::{Data, DataStruct, DeriveInput, Fields, FieldsNamed};
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pub fn impl_lua_device_macro(ast: &DeriveInput) -> TokenStream {
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let name = &ast.ident;
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// TODO: Handle errors properly
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// This includes making sure one, and only one config is specified
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let config = if let Data::Struct(DataStruct {
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fields: Fields::Named(FieldsNamed { ref named, .. }),
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..
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}) = ast.data
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{
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named
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.iter()
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.find(|&field| {
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field
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.attrs
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.iter()
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.any(|attr| attr.path().is_ident("config"))
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})
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.map(|field| field.ty.clone())
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.unwrap()
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} else {
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unimplemented!()
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};
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let gen = quote! {
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impl #name {
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pub fn register_with_lua(lua: &mlua::Lua) -> mlua::Result<()> {
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lua.globals().set(stringify!(#name), lua.create_proxy::<#name>()?)
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}
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}
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impl mlua::UserData for #name {
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fn add_methods<'lua, M: mlua::UserDataMethods<'lua, Self>>(methods: &mut M) {
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methods.add_function("new", |lua, config: mlua::Value| {
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let config: #config = mlua::FromLua::from_lua(config, lua)?;
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let config: Box<dyn crate::device_manager::DeviceConfig> = Box::new(config);
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Ok(config)
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});
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}
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}
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};
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gen
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}
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