1use quote::quote;23pub(crate) fn impl_abi_macro(ast: &syn::DeriveInput) -> syn::Result<proc_macro2::TokenStream> {4 let name = &ast.ident;5 let (is_named_fields, field_names, field_types, params_count) = match &ast.data {6 syn::Data::Struct(ds) => match ds.fields {7 syn::Fields::Named(ref fields) => Ok((8 true,9 fields.named.iter().enumerate().map(map_field_to_name),10 fields.named.iter().map(map_field_to_type),11 fields.named.len(),12 )),13 syn::Fields::Unnamed(ref fields) => Ok((14 false,15 fields.unnamed.iter().enumerate().map(map_field_to_name),16 fields.unnamed.iter().map(map_field_to_type),17 fields.unnamed.len(),18 )),19 syn::Fields::Unit => Err(syn::Error::new(name.span(), "Unit structs not supported")),20 },21 syn::Data::Enum(_) => Err(syn::Error::new(name.span(), "Enums not supported")),22 syn::Data::Union(_) => Err(syn::Error::new(name.span(), "Unions not supported")),23 }?;2425 if params_count == 0 {26 return Err(syn::Error::new(name.span(), "Empty structs not supported"));27 };2829 let can_be_plcaed_in_vec = impl_can_be_placed_in_vec(name);30 let abi_type = impl_abi_type(name, field_types.clone());31 let abi_read = impl_abi_read(name, is_named_fields, field_names.clone(), field_types);32 let abi_write = impl_abi_write(name, is_named_fields, params_count, field_names);33 3435 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::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 is_dynamic = <Self as ::evm_coder::abi::AbiType>::is_dynamic();116 let size = if !is_dynamic {117 Some(<Self as ::evm_coder::abi::AbiType>::size())118 } else {119 None120 };121 let mut subresult = reader.subresult(size)?;122 #(123 let #field_names = {124 let value = <#field_types as ::evm_coder::abi::AbiRead>::abi_read(&mut subresult)?;125 if !is_dynamic {subresult.bytes_read(<#field_types as ::evm_coder::abi::AbiType>::size())};126 value127 };128 )*129130 #struct_constructor131 }132 }133 )134}135136fn impl_abi_write<'a>(137 name: &syn::Ident,138 is_named_fields: bool,139 params_count: usize,140 field_names: impl Iterator<Item = proc_macro2::Ident> + Clone,141) -> proc_macro2::TokenStream {142 let abi_write = if is_named_fields {143 quote!(144 #(145 ::evm_coder::abi::AbiWrite::abi_write(&self.#field_names, sub);146 )*147 )148 } else {149 let field_names = (0..params_count)150 .into_iter()151 .map(proc_macro2::Literal::usize_unsuffixed);152 quote!(153 #(154 ::evm_coder::abi::AbiWrite::abi_write(&self.#field_names, sub);155 )*156 )157 };158 quote!(159 impl ::evm_coder::abi::AbiWrite for #name {160 fn abi_write(&self, writer: &mut ::evm_coder::abi::AbiWriter) {161 if <Self as ::evm_coder::abi::AbiType>::is_dynamic() {162 let mut sub = ::evm_coder::abi::AbiWriter::new();163 {164 let sub = &mut sub;165 #abi_write166 }167 writer.write_subresult(sub);168 } else {169 let sub = writer;170 #abi_write171 }172 }173 }174 )175}