bitcode_derive/
lib.rs
use crate::decode::Decode;
use crate::encode::Encode;
use crate::shared::Derive;
use proc_macro::TokenStream;
use quote::quote;
use syn::spanned::Spanned;
use syn::{parse_macro_input, DeriveInput, Error};
mod attribute;
mod bound;
mod decode;
mod encode;
mod shared;
macro_rules! derive {
($fn_name:ident, $trait_:ident) => {
#[proc_macro_derive($trait_, attributes(bitcode))]
pub fn $fn_name(input: TokenStream) -> TokenStream {
$trait_
.derive(parse_macro_input!(input as DeriveInput))
.unwrap_or_else(Error::into_compile_error)
.into()
}
};
}
derive!(derive_encode, Encode);
derive!(derive_decode, Decode);
pub(crate) fn error(spanned: &impl Spanned, s: &str) -> Error {
Error::new(spanned.span(), s.to_owned())
}
pub(crate) fn err<T>(spanned: &impl Spanned, s: &str) -> Result<T, Error> {
Err(error(spanned, s))
}
pub(crate) fn private(crate_name: &syn::Path) -> proc_macro2::TokenStream {
quote! { #crate_name::__private }
}