68 lines
2.3 KiB
Rust
68 lines
2.3 KiB
Rust
// Copyright (C) Parity Technologies (UK) Ltd.
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// This file is part of Pezkuwi.
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// Pezkuwi is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Pezkuwi is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Pezkuwi. If not, see <http://www.gnu.org/licenses/>.
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use inflector::Inflector;
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use quote::format_ident;
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pub fn derive(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
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let input: syn::DeriveInput = match syn::parse(item) {
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Ok(input) => input,
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Err(e) => return e.into_compile_error().into(),
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};
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let syn::DeriveInput { generics, data, .. } = input;
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match data {
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syn::Data::Enum(syn::DataEnum { variants, .. }) => {
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let methods = variants.into_iter().map(|syn::Variant { ident, fields, .. }| {
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let snake_cased_ident = format_ident!("{}", ident.to_string().to_snake_case());
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let ref_fields =
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fields.into_iter().enumerate().map(|(idx, syn::Field { ident, ty, .. })| {
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let field_name = ident.unwrap_or_else(|| format_ident!("_{}", idx));
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let field_ty = match ty {
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syn::Type::Reference(r) => {
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// If the type is already a reference, do nothing
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quote::quote!(#r)
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},
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t => {
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// Otherwise, make it a reference
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quote::quote!(&#t)
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},
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};
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quote::quote!(#field_name: #field_ty,)
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});
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quote::quote!(fn #snake_cased_ident( #(#ref_fields)* ) -> Weight;)
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});
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let res = quote::quote! {
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pub trait XcmWeightInfo #generics {
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#(#methods)*
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}
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};
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res.into()
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},
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syn::Data::Struct(syn::DataStruct { struct_token, .. }) => {
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let msg = "structs are not supported by 'derive(XcmWeightInfo)'";
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syn::Error::new(struct_token.span, msg).into_compile_error().into()
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},
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syn::Data::Union(syn::DataUnion { union_token, .. }) => {
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let msg = "unions are not supported by 'derive(XcmWeightInfo)'";
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syn::Error::new(union_token.span, msg).into_compile_error().into()
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},
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}
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}
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