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#![recursion_limit = "128"]
extern crate proc_macro;
use proc_macro::TokenStream;
use proc_macro2::TokenStream as TokenStream2;
use quote::quote;
use syn::{parse_macro_input, DeriveInput};
#[proc_macro_derive(Actor)]
pub fn actor(input: TokenStream) -> TokenStream {
let ast = parse_macro_input!(input as DeriveInput);
let gen = impl_actor(&ast);
gen.into()
}
fn impl_actor(ast: &syn::DeriveInput) -> TokenStream2 {
let name = &ast.ident;
if let syn::Data::Struct(_) = ast.data {
quote! {
impl ActorRaw for #name {
fn receive(&mut self, env: messaging::ReceiveEnvelope) -> () {
println!("Got msg, but component isn't handling any: {:?}", env);
}
}
}
} else {
panic!("#[derive(Actor)] is only defined for structs, not for enums!");
}
}