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mod attribute_helpers; use crate::attribute_helpers::{contains_initialize_with, contains_skip}; use proc_macro2::Span; use quote::quote; use syn::export::TokenStream2; use syn::{Fields, Ident, Index, ItemEnum, ItemStruct, ItemUnion}; pub fn struct_ser(input: &ItemStruct) -> syn::Result<TokenStream2> { let name = &input.ident; let mut body = TokenStream2::new(); match &input.fields { Fields::Named(fields) => { for field in &fields.named { if contains_skip(&field.attrs) { continue; } let field_name = field.ident.as_ref().unwrap(); let delta = quote! { borsh::Serializable::write(&self.#field_name, writer)?; }; body.extend(delta); } } Fields::Unnamed(fields) => { for field_idx in 0..fields.unnamed.len() { let field_idx = Index { index: field_idx as u32, span: Span::call_site(), }; let delta = quote! { borsh::Serializable::write(&self.#field_idx, writer)?; }; body.extend(delta); } } Fields::Unit => {} } Ok(quote! { impl borsh::ser::Serializable for #name { fn write<W: std::io::Write>(&self, writer: &mut W) -> Result<(), std::io::Error> { #body Ok(()) } } }) } pub fn enum_ser(input: &ItemEnum) -> syn::Result<TokenStream2> { let name = &input.ident; let mut body = TokenStream2::new(); for (variant_idx, variant) in input.variants.iter().enumerate() { let variant_idx = variant_idx as u8; let variant_ident = &variant.ident; let mut variant_header = TokenStream2::new(); let mut variant_body = TokenStream2::new(); match &variant.fields { Fields::Named(fields) => { for field in &fields.named { let field_name = field.ident.as_ref().unwrap(); if contains_skip(&field.attrs) { variant_header.extend(quote! { _#field_name, }); continue; } else { variant_header.extend(quote! { #field_name, }); } variant_body.extend(quote! { borsh::Serializable::write(#field_name, writer)?; }) } variant_header = quote! { { #variant_header }}; } Fields::Unnamed(fields) => { for (field_idx, field) in fields.unnamed.iter().enumerate() { let field_idx = field_idx as u32; if contains_skip(&field.attrs) { let field_ident = Ident::new(format!("_id{}", field_idx).as_str(), Span::call_site()); variant_header.extend(quote! { #field_ident, }); continue; } else { let field_ident = Ident::new(format!("id{}", field_idx).as_str(), Span::call_site()); variant_header.extend(quote! { #field_ident, }); variant_body.extend(quote! { borsh::Serializable::write(#field_ident, writer)?; }) } } variant_header = quote! { ( #variant_header )}; } Fields::Unit => {} } body.extend(quote!( #name::#variant_ident #variant_header => { let variant_idx: u8 = #variant_idx; writer.write(&variant_idx.to_le_bytes())?; #variant_body } )) } Ok(quote! { impl borsh::ser::Serializable for #name { fn write<W: std::io::Write>(&self, writer: &mut W) -> Result<(), std::io::Error> { match self { #body } Ok(()) } } }) } pub fn union_ser(_input: &ItemUnion) -> syn::Result<TokenStream2> { unimplemented!() } pub fn struct_de(input: &ItemStruct) -> syn::Result<TokenStream2> { let name = &input.ident; let init_method = contains_initialize_with(&input.attrs)?; let return_value = match &input.fields { Fields::Named(fields) => { let mut body = TokenStream2::new(); for field in &fields.named { let field_name = field.ident.as_ref().unwrap(); let delta = if contains_skip(&field.attrs) { quote! { #field_name: Default::default(), } } else { quote! { #field_name: borsh::Deserializable::read(reader)?, } }; body.extend(delta); } quote! { Self { #body } } } Fields::Unnamed(fields) => { let mut body = TokenStream2::new(); for _ in 0..fields.unnamed.len() { let delta = quote! { borsh::Deserializable::read(reader)?, }; body.extend(delta); } quote! { Self( #body ) } } Fields::Unit => { quote! { Self {} } } }; if let Some(method_ident) = init_method { Ok(quote! { impl borsh::de::Deserializable for #name { fn read<R: std::io::Read>(reader: &mut R) -> Result<Self, std::io::Error> { let mut return_value = #return_value; return_value.#method_ident(); Ok(return_value) } } }) } else { Ok(quote! { impl borsh::de::Deserializable for #name { fn read<R: std::io::Read>(reader: &mut R) -> Result<Self, std::io::Error> { Ok(#return_value) } } }) } } pub fn enum_de(input: &ItemEnum) -> syn::Result<TokenStream2> { let name = &input.ident; let init_method = contains_initialize_with(&input.attrs)?; let mut variant_arms = TokenStream2::new(); for (variant_idx, variant) in input.variants.iter().enumerate() { let variant_idx = variant_idx as u8; let variant_ident = &variant.ident; let mut variant_header = TokenStream2::new(); match &variant.fields { Fields::Named(fields) => { for field in &fields.named { let field_name = field.ident.as_ref().unwrap(); if contains_skip(&field.attrs) { variant_header.extend(quote! { #field_name: Default::default(), }); } else { variant_header.extend(quote! { #field_name: borsh::Deserializable::read(reader)?, }); } } variant_header = quote! { { #variant_header }}; } Fields::Unnamed(fields) => { for field in fields.unnamed.iter() { if contains_skip(&field.attrs) { variant_header.extend(quote! { Default::default(), }); } else { variant_header.extend(quote! { borsh::Deserializable::read(reader)?, }); } } variant_header = quote! { ( #variant_header )}; } Fields::Unit => {} } variant_arms.extend(quote! { #variant_idx => #name::#variant_ident #variant_header , }); } let variant_idx = quote! { let mut variant_idx = [0u8; std::mem::size_of::<u8>()]; reader.read(&mut variant_idx)?; let variant_idx = u8::from_le_bytes(variant_idx); }; if let Some(method_ident) = init_method { Ok(quote! { impl borsh::de::Deserializable for #name { fn read<R: std::io::Read>(reader: &mut R) -> Result<Self, std::io::Error> { #variant_idx let mut return_value = match variant_idx { #variant_arms _ => panic!(format!("Unexpeted variant index: {:?}", variant_idx)), }; return_value.#method_ident(); Ok(return_value) } } }) } else { Ok(quote! { impl borsh::de::Deserializable for #name { fn read<R: std::io::Read>(reader: &mut R) -> Result<Self, std::io::Error> { #variant_idx let return_value = match variant_idx { #variant_arms _ => panic!(format!("Unexpeted variant index: {:?}", variant_idx)), }; Ok(return_value) } } }) } } pub fn union_de(_input: &ItemUnion) -> syn::Result<TokenStream2> { unimplemented!() }