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use proc_macro::TokenStream;
use quote::{format_ident, quote};
use syn::DeriveInput;
#[proc_macro_derive(Bytes)]
pub fn derive_bytes(input: TokenStream) -> TokenStream {
let input = syn::parse_macro_input!(input as DeriveInput);
let ident = input.ident;
let generics = input.generics;
let mut gen_where = quote!();
{
let mut gen = Vec::new();
for generig in generics.type_params() {
gen.push(quote!(#generig: TBytes))
}
if !gen.is_empty() {
gen_where = quote! {
where #(#gen),*
}
}
}
match input.data {
syn::Data::Struct(s) => {
let mut names = Vec::with_capacity(s.fields.len());
let mut types = Vec::with_capacity(s.fields.len());
for field in s.fields {
names.push(field.ident);
types.push(field.ty);
}
quote! {
impl #generics TBytes for #ident #generics #gen_where{
fn size(&self) -> usize{
#(self.#names.size())+*
}
fn to_bytes(&self) -> Vec<u8>{
let mut buffer = Vec::with_capacity(self.size());
#(buffer.append(&mut self.#names.to_bytes());)*
buffer
}
fn from_bytes(bytes: &mut Vec<u8>) -> Option<Self>{
#(let #names = <#types>::from_bytes(bytes)?;)*
Some(Self{
#(#names),*
})
}
}
}
.into()
}
syn::Data::Enum(e) => {
let mut idxs = Vec::new();
let mut idents = Vec::new();
let mut fields = Vec::new();
for (i, variant) in e.variants.iter().enumerate() {
idxs.push(i);
idents.push(variant.ident.clone());
fields.push(variant.fields.clone());
}
let mut variant_from = Vec::new();
let mut variant_to = Vec::new();
let mut variants = Vec::new();
let mut variant_size = Vec::new();
for i in 0..idents.len() {
let ident = idents[i].clone();
let fields = fields[i].clone();
let mut variant_init_vars = Vec::new();
let mut variant_vars = Vec::new();
let mut is_object = false;
for (ii, field) in fields.iter().enumerate() {
let ty = field.ty.clone();
if let Some(ident) = field.ident.clone() {
is_object = true;
variant_init_vars.push(quote!(
#ident : <#ty>::from_bytes(bytes)?
));
variant_vars.push(quote!(
#ident
));
} else {
variant_init_vars.push(quote!(
<#ty>::from_bytes(bytes)?
));
let vii = format_ident!("v{}", ii);
variant_vars.push(quote!(#vii));
}
}
if variant_vars.len() > 0 {
if is_object {
variants.push(quote!(#ident{#(#variant_vars),*}));
} else {
variants.push(quote!(#ident(#(#variant_vars),*)));
}
variant_to.push(quote! {
#(buffer.append(&mut #variant_vars.to_bytes());)*
});
variant_size.push(quote! {
#(#variant_vars.size())+*
});
} else {
variants.push(quote! {
#ident
});
variant_to.push(quote! {});
variant_size.push(quote! {0});
}
if variant_init_vars.len() > 0 {
if is_object {
variant_from.push(quote! {
#ident{#(#variant_init_vars),*}
});
} else {
variant_from.push(quote! {
#ident(#(#variant_init_vars),*)
});
}
} else {
variant_from.push(quote! {
#ident
});
}
}
quote! {
impl #generics TBytes for #ident #generics #gen_where{
fn size(&self) -> usize{
match self{
#(Self::#variants => #variant_size),*
}
}
fn to_bytes(&self) -> Vec<u8>{
let mut buffer = Vec::new();
match self{
#(Self::#variants => {buffer.append(&mut #idxs.to_bytes()); #variant_to}),*
};
buffer
}
fn from_bytes(bytes: &mut Vec<u8>) -> Option<Self>{
let id = usize::from_bytes(bytes)?;
match id{
#(#idxs => Some(Self::#variant_from),)*
_=> None
}
}
}
}
.into()
}
syn::Data::Union(_) => todo!(),
}
}