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 can_be_plcaed_in_vec = impl_can_be_placed_in_vec(name);7 let abi_type = impl_abi_type(ast)?;8 9 Ok(quote! {10 #can_be_plcaed_in_vec11 #abi_type12 })13}1415fn impl_can_be_placed_in_vec(ident: &syn::Ident) -> proc_macro2::TokenStream {16 quote! {17 impl ::evm_coder::abi::sealed::CanBePlacedInVec for #ident {}18 }19}2021fn map_field_to_type<'a>(field: &'a syn::Field) -> &'a syn::Type {22 &field.ty23}2425fn impl_abi_type(ast: &syn::DeriveInput) -> syn::Result<proc_macro2::TokenStream> {26 let name = &ast.ident;27 let (fields, params_count) = match &ast.data {28 syn::Data::Struct(ds) => match ds.fields {29 syn::Fields::Named(ref fields) => Ok((30 fields.named.iter().map(map_field_to_type),31 fields.named.len(),32 )),33 syn::Fields::Unnamed(ref fields) => Ok((34 fields.unnamed.iter().map(map_field_to_type),35 fields.unnamed.len(),36 )),37 syn::Fields::Unit => Err(syn::Error::new(name.span(), "Unit structs not supported")),38 },39 syn::Data::Enum(_) => Err(syn::Error::new(name.span(), "Enums not supported")),40 syn::Data::Union(_) => Err(syn::Error::new(name.span(), "Unions not supported")),41 }?;4243 let mut params_signature = {44 let fields = fields.clone();45 quote!(46 #(nameof(<#fields as ::evm_coder::abi::AbiType>::SIGNATURE) fixed(","))*47 )48 };4950 if params_count == 0 {51 return Err(syn::Error::new(name.span(), "Empty structs not supported"));52 };5354 params_signature.extend(quote!(shift_left(1)));5556 let fields_for_dynamic = fields.clone();5758 Ok(quote! {59 impl ::evm_coder::abi::AbiType for #name {60 const SIGNATURE: ::evm_coder::custom_signature::SignatureUnit = ::evm_coder::make_signature!(61 new fixed("(")62 #params_signature63 fixed(")")64 );65 fn is_dynamic() -> bool {66 false67 #(68 || <#fields_for_dynamic as ::evm_coder::abi::AbiType>::is_dynamic()69 )*70 }71 fn size() -> usize {72 0 #(+ <#fields as ::evm_coder::abi::AbiType>::size())*73 }74 }75 })76}