1use quote::quote;23pub(crate) fn impl_abi_macro(ast: &syn::DeriveInput) -> syn::Result<proc_macro2::TokenStream> {4 5 let name = &ast.ident;6 let (is_named_fields, field_names, field_types, params_count) = match &ast.data {7 syn::Data::Struct(ds) => match ds.fields {8 syn::Fields::Named(ref fields) => Ok((9 true,10 fields.named.iter().enumerate().map(map_field_to_name),11 fields.named.iter().map(map_field_to_type),12 fields.named.len(),13 )),14 syn::Fields::Unnamed(ref fields) => Ok((15 false,16 fields.unnamed.iter().enumerate().map(map_field_to_name),17 fields.unnamed.iter().map(map_field_to_type),18 fields.unnamed.len(),19 )),20 syn::Fields::Unit => Err(syn::Error::new(name.span(), "Unit structs not supported")),21 },22 syn::Data::Enum(_) => Err(syn::Error::new(name.span(), "Enums not supported")),23 syn::Data::Union(_) => Err(syn::Error::new(name.span(), "Unions not supported")),24 }?;2526 if params_count == 0 {27 return Err(syn::Error::new(name.span(), "Empty structs not supported"));28 };2930 let can_be_plcaed_in_vec = impl_can_be_placed_in_vec(name);31 let abi_type = impl_abi_type(name, field_types.clone());32 let abi_read = impl_abi_read(name, is_named_fields, field_names.clone(), field_types);33 let abi_write = impl_abi_write(name, is_named_fields, params_count, field_names);34 println!("{}", abi_write);35 Ok(quote! {36 #can_be_plcaed_in_vec37 #abi_type38 #abi_read39 #abi_write40 })41}4243fn impl_can_be_placed_in_vec(ident: &syn::Ident) -> proc_macro2::TokenStream {44 quote! {45 impl ::evm_coder::abi::sealed::CanBePlacedInVec for #ident {}46 }47}4849fn map_field_to_name(field: (usize, &syn::Field)) -> syn::Ident {50 match field.1.ident.as_ref() {51 Some(name) => name.clone(),52 None => {53 let mut name = "field".to_string();54 name.push_str(field.0.to_string().as_str());55 syn::Ident::new(name.as_str(), proc_macro2::Span::call_site())56 }57 }58}5960fn map_field_to_type<'a>(field: &'a syn::Field) -> &'a syn::Type {61 &field.ty62}6364fn impl_abi_type<'a>(65 name: &syn::Ident,66 field_types: impl Iterator<Item = &'a syn::Type> + Clone,67) -> proc_macro2::TokenStream {68 let mut params_signature = {69 let types = field_types.clone();70 quote!(71 #(nameof(<#types as ::evm_coder::abi::AbiType>::SIGNATURE) fixed(","))*72 )73 };7475 params_signature.extend(quote!(shift_left(1)));7677 let fields_for_dynamic = field_types.clone();7879 quote! {80 impl ::evm_coder::abi::AbiType for #name {81 const SIGNATURE: ::evm_coder::custom_signature::SignatureUnit = ::evm_coder::make_signature!(82 new fixed("(")83 #params_signature84 fixed(")")85 );86 fn is_dynamic() -> bool {87 false88 #(89 || <#fields_for_dynamic as ::evm_coder::abi::AbiType>::is_dynamic()90 )*91 }92 fn size() -> usize {93 0 #(+ <#field_types as ::evm_coder::abi::AbiType>::size())*94 }95 }96 }97}9899fn impl_abi_read<'a>(100 name: &syn::Ident,101 is_named_fields: bool,102 field_names: impl Iterator<Item = proc_macro2::Ident> + Clone,103 field_types: impl Iterator<Item = &'a syn::Type> + Clone,104) -> proc_macro2::TokenStream {105 let field_names1 = field_names.clone();106107 let struct_constructor = if is_named_fields {108 quote!(Ok(Self { #(#field_names1),* }))109 } else {110 quote!(Ok(Self ( #(#field_names1),* )))111 };112 quote!(113 impl ::evm_coder::abi::AbiRead for #name {114 fn abi_read(reader: &mut ::evm_coder::abi::AbiReader) -> ::evm_coder::execution::Result<Self> {115 let size = if !<Self as ::evm_coder::abi::AbiType>::is_dynamic() {116 Some(<Self as ::evm_coder::abi::AbiType>::size())117 } else {118 None119 };120 let mut subresult = reader.subresult(size)?;121 #(122 let #field_names = <#field_types as ::evm_coder::abi::AbiRead>::abi_read(&mut subresult)?;123 )*124125 #struct_constructor126 }127 }128 )129}130131fn impl_abi_write<'a>(132 name: &syn::Ident,133 is_named_fields: bool,134 params_count: usize,135 field_names: impl Iterator<Item = proc_macro2::Ident> + Clone,136) -> proc_macro2::TokenStream {137 let abi_write = if is_named_fields {138 quote!(139 #(140 self.#field_names.abi_write(writer);141 )*142 )143 } else {144 let field_names = (0..params_count)145 .into_iter()146 .map(proc_macro2::Literal::usize_unsuffixed);147 quote!(148 #(149 self.#field_names.abi_write(writer);150 )*151 )152 };153 quote!(154 impl ::evm_coder::abi::AbiWrite for #name {155 fn abi_write(&self, writer: &mut ::evm_coder::abi::AbiWriter) {156 #abi_write157 }158 }159 )160}