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Merged
jadebenn merged 1 commit into from
Aug 7, 2025
Merged

run rustfmt on endio_derive #14

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47 changes: 47 additions & 0 deletions endio_derive/Cargo.lock
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270 changes: 142 additions & 128 deletions endio_derive/src/deserialize.rs
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Original file line number Diff line number Diff line change
@@ -1,158 +1,172 @@
use proc_macro2::{Ident, TokenStream};
use quote::quote;
use syn::{parse_macro_input, parse_quote, Data, DataEnum, DeriveInput, Fields, LitInt, WhereClause};
use syn::{
Data, DataEnum, DeriveInput, Fields, LitInt, WhereClause, parse_macro_input, parse_quote,
};

use crate::{get_field_padding, get_pre_disc_padding, get_post_disc_padding, get_trailing_padding};
use crate::{get_field_padding, get_post_disc_padding, get_pre_disc_padding, get_trailing_padding};

pub fn derive(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let mut input = parse_macro_input!(input as DeriveInput);
let where_generics = &mut input.generics.clone();
let mut where_clause = where_generics.make_where_clause();
let mut input = parse_macro_input!(input as DeriveInput);
let where_generics = &mut input.generics.clone();
let mut where_clause = where_generics.make_where_clause();

let name = &input.ident;
let name = &input.ident;

let deser_code = match &input.data {
Data::Struct(data) => {
add_where_clauses_fields(&mut where_clause, &data.fields);
gen_deser_code_struct(&data.fields)
}
Data::Enum(data) => {
let ty = crate::get_enum_type(&input);
add_where_clauses_enum(&mut where_clause, data, &ty);
let pre_disc_padding = get_pre_disc_padding(&input);
let post_disc_padding = get_post_disc_padding(&input);
gen_deser_code_enum(data, &name, &ty, &pre_disc_padding, &post_disc_padding)
}
Data::Union(_) => unimplemented!(),
};
let deser_code = match &input.data {
Data::Struct(data) => {
add_where_clauses_fields(&mut where_clause, &data.fields);
gen_deser_code_struct(&data.fields)
}
Data::Enum(data) => {
let ty = crate::get_enum_type(&input);
add_where_clauses_enum(&mut where_clause, data, &ty);
let pre_disc_padding = get_pre_disc_padding(&input);
let post_disc_padding = get_post_disc_padding(&input);
gen_deser_code_enum(data, &name, &ty, &pre_disc_padding, &post_disc_padding)
}
Data::Union(_) => unimplemented!(),
};

let trailing_padding = get_trailing_padding(&input);
let read_padding = gen_read_padding(&trailing_padding);
let trailing_padding = get_trailing_padding(&input);
let read_padding = gen_read_padding(&trailing_padding);

let (_, ty_generics, where_clause) = where_generics.split_for_impl();
let (_, ty_generics, where_clause) = where_generics.split_for_impl();

// todo[hygiene]: replace __ENDIO_ENDIANNESS, __ENDIO_READER with unique ident
input.generics.params.push(parse_quote!(__ENDIO_ENDIANNESS: ::endio::Endianness));
input.generics.params.push(parse_quote!(__ENDIO_READER: ::std::io::Read + ::endio::ERead<__ENDIO_ENDIANNESS>));
let (impl_generics, _, _) = input.generics.split_for_impl();
// todo[hygiene]: replace __ENDIO_ENDIANNESS, __ENDIO_READER with unique ident
input
.generics
.params
.push(parse_quote!(__ENDIO_ENDIANNESS: ::endio::Endianness));
input
.generics
.params
.push(parse_quote!(__ENDIO_READER: ::std::io::Read + ::endio::ERead<__ENDIO_ENDIANNESS>));
let (impl_generics, _, _) = input.generics.split_for_impl();

let expanded = quote! {
impl #impl_generics ::endio::Deserialize<__ENDIO_ENDIANNESS, __ENDIO_READER> for #name #ty_generics #where_clause {
fn deserialize(reader: &mut __ENDIO_READER) -> ::std::io::Result<Self> {
#deser_code
#read_padding
Ok(ret)
}
}
};
let expanded = quote! {
impl #impl_generics ::endio::Deserialize<__ENDIO_ENDIANNESS, __ENDIO_READER> for #name #ty_generics #where_clause {
fn deserialize(reader: &mut __ENDIO_READER) -> ::std::io::Result<Self> {
#deser_code
#read_padding
Ok(ret)
}
}
};

expanded.into()
expanded.into()
}

fn add_where_clauses_fields(where_clause: &mut WhereClause, fields: &Fields) {
match fields {
Fields::Named(fields) => {
for f in &fields.named {
let ty = &f.ty;
where_clause.predicates.push(
parse_quote!(#ty: ::endio::Deserialize<__ENDIO_ENDIANNESS, __ENDIO_READER>)
);
}
}
Fields::Unnamed(fields) => {
for f in &fields.unnamed {
let ty = &f.ty;
where_clause.predicates.push(
parse_quote!(#ty: ::endio::Deserialize<__ENDIO_ENDIANNESS, __ENDIO_READER>)
);
}
}
Fields::Unit => {}
}
match fields {
Fields::Named(fields) => {
for f in &fields.named {
let ty = &f.ty;
where_clause.predicates.push(
parse_quote!(#ty: ::endio::Deserialize<__ENDIO_ENDIANNESS, __ENDIO_READER>),
);
}
}
Fields::Unnamed(fields) => {
for f in &fields.unnamed {
let ty = &f.ty;
where_clause.predicates.push(
parse_quote!(#ty: ::endio::Deserialize<__ENDIO_ENDIANNESS, __ENDIO_READER>),
);
}
}
Fields::Unit => {}
}
}

fn gen_deser_code_fields(fields: &Fields) -> TokenStream {
match fields {
Fields::Named(fields) => {
let mut deser = vec![];
for f in &fields.named {
let ident = &f.ident;
let padding = get_field_padding(f);
let read_padding = gen_read_padding(&padding);
deser.push(quote! { #ident: {
#read_padding
::endio::ERead::read(reader)?
}, });
}
quote! { { #(#deser)* } }
}
Fields::Unnamed(fields) => {
let mut deser = vec![];
for f in &fields.unnamed {
let padding = get_field_padding(f);
let read_padding = gen_read_padding(&padding);
deser.push(quote! { {
#read_padding
::endio::ERead::read(reader)?
}, });
}
quote! { ( #(#deser)* ) }
}
Fields::Unit => {
quote! { }
}
}
match fields {
Fields::Named(fields) => {
let mut deser = vec![];
for f in &fields.named {
let ident = &f.ident;
let padding = get_field_padding(f);
let read_padding = gen_read_padding(&padding);
deser.push(quote! { #ident: {
#read_padding
::endio::ERead::read(reader)?
}, });
}
quote! { { #(#deser)* } }
}
Fields::Unnamed(fields) => {
let mut deser = vec![];
for f in &fields.unnamed {
let padding = get_field_padding(f);
let read_padding = gen_read_padding(&padding);
deser.push(quote! { {
#read_padding
::endio::ERead::read(reader)?
}, });
}
quote! { ( #(#deser)* ) }
}
Fields::Unit => {
quote! {}
}
}
}

fn gen_deser_code_struct(fields: &Fields) -> TokenStream {
let deser_code = gen_deser_code_fields(fields);
quote! { let ret = Self #deser_code; }
let deser_code = gen_deser_code_fields(fields);
quote! { let ret = Self #deser_code; }
}

fn add_where_clauses_enum(where_clause: &mut WhereClause, data: &DataEnum, ty: &Ident) {
where_clause.predicates.push(
parse_quote!(#ty: ::endio::Deserialize<__ENDIO_ENDIANNESS, __ENDIO_READER>)
);
for var in &data.variants {
add_where_clauses_fields(where_clause, &var.fields);
}
where_clause
.predicates
.push(parse_quote!(#ty: ::endio::Deserialize<__ENDIO_ENDIANNESS, __ENDIO_READER>));
for var in &data.variants {
add_where_clauses_fields(where_clause, &var.fields);
}
}

fn gen_deser_code_enum(data: &DataEnum, name: &Ident, ty: &Ident, pre_disc_padding: &Option<LitInt>, post_disc_padding: &Option<LitInt>) -> TokenStream {
let last_disc: syn::ExprLit = parse_quote! { 0 };
let mut last_disc = &last_disc.into();
let mut disc_offset = 0;
let mut arms = vec![];
for f in &data.variants {
let ident = &f.ident;
if let Some((_, x)) = &f.discriminant {
last_disc = x;
disc_offset = 0;
}
let deser_fields = gen_deser_code_fields(&f.fields);
let arm = quote! { disc if disc == (#last_disc + (#disc_offset as #ty)) => Self::#ident #deser_fields, };
disc_offset += 1;
arms.push(arm);
}
let read_pre_padding = gen_read_padding(pre_disc_padding);
let read_post_padding = gen_read_padding(post_disc_padding);
quote! {
#read_pre_padding
let disc: #ty = ::endio::ERead::read(reader)?;
#read_post_padding
let ret = match disc {
#(#arms)*
_ => return ::std::result::Result::Err(::std::io::Error::new(::std::io::ErrorKind::InvalidData, format!("invalid discriminant value for {}: {}", stringify!(#name), disc)))
};
}
fn gen_deser_code_enum(
data: &DataEnum,
name: &Ident,
ty: &Ident,
pre_disc_padding: &Option<LitInt>,
post_disc_padding: &Option<LitInt>,
) -> TokenStream {
let last_disc: syn::ExprLit = parse_quote! { 0 };
let mut last_disc = &last_disc.into();
let mut disc_offset = 0;
let mut arms = vec![];
for f in &data.variants {
let ident = &f.ident;
if let Some((_, x)) = &f.discriminant {
last_disc = x;
disc_offset = 0;
}
let deser_fields = gen_deser_code_fields(&f.fields);
let arm = quote! { disc if disc == (#last_disc + (#disc_offset as #ty)) => Self::#ident #deser_fields, };
disc_offset += 1;
arms.push(arm);
}
let read_pre_padding = gen_read_padding(pre_disc_padding);
let read_post_padding = gen_read_padding(post_disc_padding);
quote! {
#read_pre_padding
let disc: #ty = ::endio::ERead::read(reader)?;
#read_post_padding
let ret = match disc {
#(#arms)*
_ => return ::std::result::Result::Err(::std::io::Error::new(::std::io::ErrorKind::InvalidData, format!("invalid discriminant value for {}: {}", stringify!(#name), disc)))
};
}
}

fn gen_read_padding(padding: &Option<LitInt>) -> TokenStream {
match padding {
Some(x) => quote! {
let mut padding = [0; #x];
::std::io::Read::read_exact(reader, &mut padding)?;
},
None => quote! { },
}
match padding {
Some(x) => quote! {
let mut padding = [0; #x];
::std::io::Read::read_exact(reader, &mut padding)?;
},
None => quote! {},
}
}
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