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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 matches!(data.fields, Fields::Unit) {
quote! {
#[inline(always)]
fn deserialise(_stream: &::bzipper::Dstream) -> ::bzipper::Result<Self> { Ok(Self) }
}
} else {
let mut chain_commands = Punctuated::<TokenStream, Token![,]>::new();
for field in &data.fields {
let command = field.ident
.as_ref()
.map_or_else(
|| quote! { Deserialise::deserialise(stream)? },
|field_name| quote! { #field_name: Deserialise::deserialise(stream)? }
);
chain_commands.push(command);
}
let value = if let Fields::Named(..) = data.fields {
quote! { Self { #chain_commands } }
} else {
quote! { Self(#chain_commands) }
};
quote! {
fn deserialise(stream: &::bzipper::Dstream) -> ::bzipper::Result<Self> {
let value = #value;
Ok(value)
}
}
}
}
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