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mod decoder;
mod encoder;
mod recode;
mod util;

use darling::{FromDeriveInput, ToTokens};
use proc_macro::TokenStream;

macro_rules! emit_impl_or_error {
    ($m:ty [$i:ident]) => {
        match <$m>::from_derive_input(&syn::parse_macro_input!($i)) {
            | Ok(val) => val.into_token_stream(),
            | Err(err) => err.write_errors(),
        }
    };
}

#[proc_macro_derive(Decoder, attributes(recode))]
pub fn derive_decoder(input: TokenStream) -> TokenStream {
    emit_impl_or_error!(decoder::Decoder[input]).into()
}

#[proc_macro_derive(Encoder, attributes(recode))]
pub fn derive_encoder(input: TokenStream) -> TokenStream {
    emit_impl_or_error!(encoder::Encoder[input]).into()
}

#[proc_macro_derive(Recode, attributes(recode))]
pub fn derive_recode(input: TokenStream) -> TokenStream {
    emit_impl_or_error!(recode::Recode[input]).into()
}