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// Copyright 2024 Gabriel Bjørnager Jensen.
//
// This file is part of bZipper.
//
// bZipper is free software: you can redistribute
// it and/or modify it under the terms of the GNU
// Lesser General Public License as published by
// the Free Software Foundation, either version 3
// of the License, or (at your option) any later
// version.
//
// bZipper is distributed in the hope that it will
// be useful, but WITHOUT ANY WARRANTY; without
// even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Less-
// er General Public License along with bZipper. If
// not, see <https://www.gnu.org/licenses/>.
#![doc(html_logo_url = "https://gitlab.com/bjoernager/bzipper/-/raw/master/doc-icon.svg")]
//! This crate implements procedural macros for [`bzipper`](https://crates.io/crates/bzipper/).
use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, Data, DeriveInput};
macro_rules! use_mod {
($vis:vis $name:ident) => {
mod $name;
$vis use $name::*;
};
}
pub(crate) use use_mod;
use_mod!(discriminant);
use_mod!(discriminant_iter);
use_mod!(generic_name);
mod impls;
#[proc_macro_derive(Decode)]
pub fn derive_decode(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
let impl_body = match input.data {
Data::Enum( ref data) => impls::decode_enum( data),
Data::Struct(ref data) => impls::decode_struct(data),
Data::Union(..) => panic!("unions cannot derive `Decode`"),
};
let ty_name = &input.ident;
let generic_params = &input.generics.params;
let generic_where = &input.generics.where_clause;
let generic_names = GenericName::extract_from(&input.generics);
let output = quote! {
impl<#generic_params> ::bzipper::Decode for #ty_name<#generic_names>
#generic_where {
#impl_body
}
};
//panic!("{output}");
output.into()
}
#[proc_macro_derive(Encode)]
pub fn derive_encode(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
let impl_body = match input.data {
Data::Enum( ref data) => impls::encode_enum( data),
Data::Struct(ref data) => impls::encode_struct(data),
Data::Union(..) => panic!("unions cannot derive `Encode`"),
};
let ty_name = &input.ident;
let generic_params = &input.generics.params;
let generic_where = &input.generics.where_clause;
let generic_names = GenericName::extract_from(&input.generics);
let output = quote! {
impl<#generic_params> ::bzipper::Encode for #ty_name<#generic_names>
#generic_where {
#impl_body
}
};
//panic!("{output}");
output.into()
}
#[proc_macro_derive(SizedEncode)]
pub fn derive_sized_encode(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
let encode_impl_body = match input.data {
Data::Enum( ref data) => impls::encode_enum( data),
Data::Struct(ref data) => impls::encode_struct(data),
Data::Union(..) => panic!("unions can neither derive `Encode` nor `SizedEncode`"),
};
let sized_encode_impl_body = match input.data {
Data::Enum( ref data) => impls::sized_encode_enum( data),
Data::Struct(ref data) => impls::sized_encode_struct(data),
Data::Union(..) => unreachable!(),
};
let ty_name = &input.ident;
let generic_params = &input.generics.params;
let generic_where = &input.generics.where_clause;
let generic_names = GenericName::extract_from(&input.generics);
let output = quote! {
impl<#generic_params> ::bzipper::Encode for #ty_name<#generic_names>
#generic_where {
#encode_impl_body
}
unsafe impl<#generic_params> ::bzipper::SizedEncode for #ty_name<#generic_names>
#generic_where {
#sized_encode_impl_body
}
};
//panic!("{output}");
output.into()
}
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