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extern crate proc_macro;
use proc_macro::TokenStream;
use syn::{DataStruct, Fields, parse_macro_input, DeriveInput};
use quote::quote;
#[proc_macro_derive(Wired)]
pub fn derive_wired(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
let ident = input.ident;
let (fields, fields_read) = match input.data {
syn::Data::Struct(DataStruct { fields: Fields::Named(fields), .. }) => {
let names = fields.named.iter().map(|f| &f.ident);
let names2 = fields.named.iter().map(|f| &f.ident);
(quote! { #(self.#names.to_wire(to);)* },
quote! { Ok(Self {
#(#names2: crate::proto::Wired::from_wire(wire)?,)*
})})
}
syn::Data::Struct(DataStruct { fields: Fields::Unnamed(fields), .. }) => {
let idxs = fields.unnamed.iter().enumerate().map(|(p, _)| p);
let reads = fields.unnamed.iter()
.enumerate()
.map(|_| quote! {
crate::proto::Wired::from_wire(wire)?
});
(quote! { #(self.#idxs.to_wire(to);)*}, quote! { #(#reads,)*})
}
_ => {
panic!("Unsupported")
}
};
let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
let tokens = quote! {
impl #impl_generics crate::proto::Wired for #ident #ty_generics #where_clause {
fn to_wire(&self, to: &mut crate::proto::WireWrite) {
#fields
}
fn from_wire(wire: &mut crate::proto::WireRead) -> Result<Self, crate::proto::Error> {
#fields_read
}
}
};
tokens.into()
}