mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-27 09:17:58 +00:00
Bastian Köcher
104 lines
3.0 KiB
Rust
104 lines
3.0 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2021-2022 Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use syn::spanned::Spanned;
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/// Derive Clone but do not bound any generic.
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pub fn derive_default_no_bound(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
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let input: syn::DeriveInput = match syn::parse(input) {
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Ok(input) => input,
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Err(e) => return e.to_compile_error().into(),
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};
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let name = &input.ident;
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let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
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let impl_ = match input.data {
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syn::Data::Struct(struct_) => match struct_.fields {
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syn::Fields::Named(named) => {
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let fields = named.named.iter().map(|i| &i.ident).map(|i| {
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quote::quote_spanned!(i.span() =>
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#i: core::default::Default::default()
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)
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});
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quote::quote!( Self { #( #fields, )* } )
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},
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syn::Fields::Unnamed(unnamed) => {
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let fields =
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unnamed.unnamed.iter().enumerate().map(|(i, _)| syn::Index::from(i)).map(|i| {
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quote::quote_spanned!(i.span() =>
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core::default::Default::default()
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)
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});
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quote::quote!( Self ( #( #fields, )* ) )
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},
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syn::Fields::Unit => {
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quote::quote!(Self)
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},
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},
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syn::Data::Enum(enum_) =>
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if let Some(first_variant) = enum_.variants.first() {
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let variant_ident = &first_variant.ident;
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match &first_variant.fields {
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syn::Fields::Named(named) => {
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let fields = named.named.iter().map(|i| &i.ident).map(|i| {
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quote::quote_spanned!(i.span() =>
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#i: core::default::Default::default()
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)
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});
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quote::quote!( #name :: #ty_generics :: #variant_ident { #( #fields, )* } )
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},
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syn::Fields::Unnamed(unnamed) => {
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let fields = unnamed
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.unnamed
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.iter()
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.enumerate()
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.map(|(i, _)| syn::Index::from(i))
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.map(|i| {
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quote::quote_spanned!(i.span() =>
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core::default::Default::default()
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)
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});
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quote::quote!( #name :: #ty_generics :: #variant_ident ( #( #fields, )* ) )
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},
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syn::Fields::Unit => quote::quote!( #name :: #ty_generics :: #variant_ident ),
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}
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} else {
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quote::quote!(Self)
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},
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syn::Data::Union(_) => {
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let msg = "Union type not supported by `derive(CloneNoBound)`";
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return syn::Error::new(input.span(), msg).to_compile_error().into()
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},
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};
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quote::quote!(
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const _: () = {
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impl #impl_generics core::default::Default for #name #ty_generics #where_clause {
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fn default() -> Self {
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#impl_
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}
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}
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};
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)
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.into()
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}
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