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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/>.
use proc_macro2::TokenStream;
use quote::quote;
use syn::{DataStruct, Fields, Token};
use syn::punctuated::Punctuated;
#[must_use]
pub fn deserialise_struct(data: &DataStruct) -> TokenStream {
if let Fields::Named(..) = data.fields {
let mut chain_commands = Punctuated::<TokenStream, Token![,]>::new();
for field in &data.fields {
let name = field.ident.as_ref().unwrap();
let ty = &field.ty;
chain_commands.push(quote! { #name: stream.take::<#ty>()? });
}
quote! {
fn deserialise(data: &[u8]) -> ::bzipper::Result<Self> {
::core::debug_assert_eq!(data.len(), <Self as ::bzipper::Serialise>::SERIALISED_SIZE);
let stream = ::bzipper::Dstream::new(data);
Ok(Self { #chain_commands })
}
}
} else if let Fields::Unnamed(..) = data.fields {
let mut chain_commands = Punctuated::<TokenStream, Token![,]>::new();
for field in &data.fields {
let ty = &field.ty;
chain_commands.push(quote! { stream.take::<#ty>()? });
}
quote! {
fn deserialise(data: &[u8]) -> ::bzipper::Result<Self> {
::core::debug_assert_eq!(data.len(), <Self as ::bzipper::Serialise>::SERIALISED_SIZE);
let stream = ::bzipper::Dstream::new(data);
Ok(Self(#chain_commands))
}
}
} else {
// Fields::Unit
quote! {
#[inline(always)]
fn deserialise(data: &[u8]) -> ::bzipper::Result<Self> {
::core::debug_assert_eq!(data.len(), <Self as ::bzipper::Serialise>::SERIALISED_SIZE);
Ok(Self)
}
}
}
}
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