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extern crate proc_macro; use proc_macro::TokenStream; use proc_macro2::Span; use quote::{format_ident, quote}; use syn::{parse_macro_input, Data, DataStruct, DeriveInput, Fields, Ident}; #[proc_macro_derive(Table)] pub fn table(input: TokenStream) -> TokenStream { let input = parse_macro_input!(input as DeriveInput); if let Data::Struct(DataStruct { fields: Fields::Named(fields), .. }) = input.data { let ident = &input.ident; let fields_ident = { let mut s = ident.to_string(); s.push_str("Fields"); Ident::new(&s, Span::call_site()) }; let struct_fields = fields.named.iter().map(|field| { let name = &field.ident; let ty = &field.ty; quote! { #name: typed_sql::types::Field::<#ident, #ty>, } }); let default_fields = fields.named.iter().map(|field| { let name = &field.ident; quote! { #name: typed_sql::types::Field::new(stringify!(#name)), } }); let table_name = { let mut s = ident.to_string().to_lowercase(); s.push('s'); Ident::new(&s, Span::call_site()) }; let expanded = quote! { struct #fields_ident { #(#struct_fields)* } impl Default for #fields_ident { fn default() -> Self { Self { #(#default_fields)* } } } impl typed_sql::Table for #ident { const NAME: &'static str = stringify!(#table_name); type Fields = #fields_ident; } }; TokenStream::from(expanded) } else { todo!() } } #[proc_macro_derive(Join)] pub fn join(input: TokenStream) -> TokenStream { let input = parse_macro_input!(input as DeriveInput); if let Data::Struct(DataStruct { fields: Fields::Named(fields), .. }) = input.data { let ident = input.ident; let fields_ident = format_ident!("{}Fields", ident); let struct_fields = fields.named.iter().map(|field| { let name = &field.ident; let ty = &field.ty; quote! { #name: <#ty as typed_sql::Table>::Fields } }); let mut fields = fields.named.iter(); let table = &fields.next().unwrap().ty; let join_ident = format_ident!("{}Join", ident); let join_fields = fields.clone().map(|field| { let name = &field.ident; let g = field.ident.as_ref().unwrap().to_string().to_uppercase(); let g = format_ident!("{}", g); let ty = &field.ty; quote! { #name: typed_sql::query::select::join::Joined<#g, typed_sql::query::select::join::Inner, #ty> } }); let generics = fields.map(|field| { Ident::new( &field.ident.as_ref().unwrap().to_string().to_uppercase(), Span::call_site(), ) }); let join_generics = generics.clone().map(|generic| { quote! { #generic } }); let join_generics = quote! { #(#join_generics),* }; let impl_generics = generics.clone().map(|generic| { quote! { #generic: typed_sql::query::Predicate } }); let impl_generics = quote! { #(#impl_generics),* }; let expanded = quote! { #[derive(Default)] struct #fields_ident { #(#struct_fields),* } struct #join_ident<#join_generics> { #(#join_fields),* } impl<#impl_generics> typed_sql::Join<(#join_generics)> for #ident { type Table = #table; type Fields = #fields_ident; type Join = #join_ident<#join_generics>; } impl<#impl_generics> typed_sql::query::select::join::JoinSelect for #join_ident<#join_generics> { type Table = #table; type Fields = #fields_ident; fn write_join_select(&self, sql: &mut String) { self.post.write_join(sql); } } }; TokenStream::from(expanded) } else { todo!() } } #[proc_macro_derive(Insertable)] pub fn insertable(input: TokenStream) -> TokenStream { let input = parse_macro_input!(input as DeriveInput); if let Data::Struct(DataStruct { fields: Fields::Named(fields), .. }) = input.data { let ident = &input.ident; let write_columns = fields.named.iter().map(|field| { let name = &field.ident; quote! { sql.push_str(stringify!(#name)); } }); let write_values = fields.named.iter().map(|field| { let name = &field.ident; quote! { self.#name.write_primative(sql); } }); let expanded = quote! { impl typed_sql::Insertable for #ident { fn write_columns(sql: &mut String) { #(#write_columns)(sql.push(',');)* } fn write_values(&self, sql: &mut String) { use typed_sql::types::Primitive; #(#write_values)(sql.push(',');)* } } }; TokenStream::from(expanded) } else { todo!() } } #[proc_macro_derive(Binding)] pub fn binding(input: TokenStream) -> TokenStream { let input = parse_macro_input!(input as DeriveInput); if let Data::Struct(DataStruct { fields: Fields::Named(fields), .. }) = input.data { let ident = &input.ident; let bindings = format_ident!("{}Bindings", ident); let bind_fields = fields.named.iter().map(|field| { let name = &field.ident; quote! { #name: typed_sql::types::Bind } }); let binds = fields.named.iter().map(|field| { let name = &field.ident; quote! { #name: binder.bind() } }); let values = fields.named.iter().map(|field| { let name = &field.ident; quote! { self.#name.write_primative(sql); } }); let expanded = quote! { struct #bindings { #(#bind_fields),* } impl typed_sql::Binding for #ident { type Bindings = #bindings; fn bindings(binder: &mut typed_sql::types::bind::Binder) -> Self::Bindings { #bindings { #(#binds),* } } fn write_types(_sql: &mut String) {} fn write_values(&self, sql: &mut String) { use typed_sql::types::Primitive; #(#values)(sql.push(','))*; } } }; TokenStream::from(expanded) } else { todo!() } } #[proc_macro_derive(Queryable)] pub fn queryable(input: TokenStream) -> TokenStream { let input = parse_macro_input!(input as DeriveInput); if let Data::Struct(DataStruct { fields: Fields::Named(fields), .. }) = input.data { let ident = &input.ident; let columns = fields.named.iter().map(|field| { let name = &field.ident; quote! { sql.push_str(stringify!(#name)); } }); let expanded = quote! { impl typed_sql::Queryable for #ident { fn write_queryable(sql: &mut String) { #(#columns)(sql.push(','))* } } }; TokenStream::from(expanded) } else { todo!() } }