mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-29 02:07:56 +00:00
Shawn Tabrizi
59 lines
1.9 KiB
Rust
59 lines
1.9 KiB
Rust
// Copyright 2019-2020 Parity Technologies (UK) Ltd.
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// This file is part of Substrate.
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// Substrate 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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// Substrate 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 Substrate. If not, see <http://www.gnu.org/licenses/>.
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//! Derive macro implementation of `PassBy` with the associated type set to `Codec`.
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//!
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//! It is required that the type implements `Encode` and `Decode` from the `parity-scale-codec`
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//! crate.
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use crate::utils::{generate_crate_access, generate_runtime_interface_include};
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use syn::{DeriveInput, Result, Generics, parse_quote};
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use quote::quote;
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use proc_macro2::TokenStream;
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/// The derive implementation for `PassBy` with `Codec`.
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pub fn derive_impl(mut input: DeriveInput) -> Result<TokenStream> {
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add_trait_bounds(&mut input.generics);
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let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
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let crate_include = generate_runtime_interface_include();
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let crate_ = generate_crate_access();
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let ident = input.ident;
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let res = quote! {
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const _: () = {
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#crate_include
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impl #impl_generics #crate_::pass_by::PassBy for #ident #ty_generics #where_clause {
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type PassBy = #crate_::pass_by::Codec<#ident>;
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}
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};
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};
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Ok(res)
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}
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/// Add the `codec::Codec` trait bound to every type parameter.
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fn add_trait_bounds(generics: &mut Generics) {
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let crate_ = generate_crate_access();
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generics.type_params_mut()
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.for_each(|type_param| type_param.bounds.push(parse_quote!(#crate_::codec::Codec)));
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}
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