use proc_macro2::{Span, TokenStream};
use proc_macro_crate::{crate_name, FoundCrate};
use quote::quote;
use synstructure::{decl_derive, Structure};
decl_derive!([DagCbor, attributes(ipld)] => dag_cbor_derive);
mod ast;
mod attr;
mod gen;
mod parse;
fn dag_cbor_derive(s: Structure) -> TokenStream {
let lurk_ipld = match use_crate("lurk-ipld") {
Ok(ident) => ident,
Err(error) => return error,
};
let ast = parse::parse(&s);
let encode = gen::gen_encode(&ast, &lurk_ipld);
let decode = gen::gen_decode(&ast, &lurk_ipld);
quote! {
#encode
#decode
}
}
fn use_crate(name: &str) -> Result<syn::Ident, TokenStream> {
match crate_name(name) {
Ok(FoundCrate::Name(n)) => Ok(syn::Ident::new(&n, Span::call_site())),
Ok(FoundCrate::Itself) => Ok(syn::Ident::new("crate", Span::call_site())),
Err(err) => Err(syn::Error::new(Span::call_site(), err).to_compile_error()),
}
}
#[cfg(test)]
mod tests {
#[test]
fn test() {
let t = trybuild::TestCases::new();
t.pass("examples/basic.rs");
t.pass("examples/name_attr.rs");
t.pass("examples/repr_attr.rs");
}
}