bevy/crates/bevy_derive/src/app_plugin.rs
Carter Anderson 6eea96366d cargo fmt
2020-06-03 20:08:20 -07:00

20 lines
675 B
Rust

use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, DeriveInput};
pub fn derive_app_plugin(input: TokenStream) -> TokenStream {
let ast = parse_macro_input!(input as DeriveInput);
let struct_name = &ast.ident;
TokenStream::from(quote! {
#[no_mangle]
pub extern "C" fn _create_plugin() -> *mut bevy::app::AppPlugin {
// TODO: without this the assembly does nothing. why is that the case?
print!("");
// make sure the constructor is the correct type.
let object = #struct_name {};
let boxed = Box::new(object);
Box::into_raw(boxed)
}
})
}