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use proc_macro::TokenStream;
use proc_macro2::{Ident, TokenStream as TokenStream2};
use quote::quote;
use syn::{parse_macro_input, spanned::Spanned, ImplItem, ItemImpl, Type};
macro_rules! err {
($($tt:tt)*) => {
return syn::Error::new($($tt)*).to_compile_error().into()
};
}
#[proc_macro_attribute]
pub fn rpc_impl(_attr: TokenStream, item: TokenStream) -> TokenStream {
let mut methods: Vec<Ident> = vec![];
let item2 = item.clone();
let parsed_input = parse_macro_input!(item2 as ItemImpl);
let self_ty = match *parsed_input.self_ty {
Type::Path(p) => p,
_ => err!(
parsed_input.span(),
"implementing the trait `RPCService` on this type is unsupported"
),
};
if parsed_input.items.is_empty() {
err!(self_ty.span(), "At least one method should be implemented");
}
for item in parsed_input.items {
match item {
ImplItem::Method(method) => {
methods.push(method.sig.ident);
}
_ => err!(item.span(), "unexpected item"),
}
}
let item2: TokenStream2 = item.into();
let quoted = quote! {
karyon_jsonrpc::impl_rpc_service!(#self_ty, #(#methods),*);
#item2
};
quoted.into()
}
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