59 lines
1.9 KiB
Rust
59 lines
1.9 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 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 super::helper;
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use syn::spanned::Spanned;
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/// The definition of the pallet inherent implementation.
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pub struct InherentDef {
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/// A set of usage of instance, must be check for consistency with trait.
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pub instances: Vec<helper::InstanceUsage>,
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}
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impl InherentDef {
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pub fn try_from(item: &mut syn::Item) -> syn::Result<Self> {
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let item = if let syn::Item::Impl(item) = item {
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item
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} else {
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let msg = "Invalid pallet::inherent, expected item impl";
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return Err(syn::Error::new(item.span(), msg));
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};
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if item.trait_.is_none() {
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let msg = "Invalid pallet::inherent, expected impl<..> ProvideInherent for Pallet<..>";
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return Err(syn::Error::new(item.span(), msg));
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}
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if let Some(last) = item.trait_.as_ref().unwrap().1.segments.last() {
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if last.ident != "ProvideInherent" {
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let msg = "Invalid pallet::inherent, expected trait ProvideInherent";
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return Err(syn::Error::new(last.span(), msg));
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}
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} else {
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let msg = "Invalid pallet::inherent, expected impl<..> ProvideInherent for Pallet<..>";
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return Err(syn::Error::new(item.span(), msg));
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}
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let instances = vec![
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helper::check_pallet_struct_usage(&item.self_ty)?,
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helper::check_impl_gen(&item.generics, item.impl_token.span())?,
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];
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Ok(InherentDef { instances })
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}
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}
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