feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

substrate/frame/support/procedural/src/pallet/parse/inherent.rs

@@ -0,0 +1,58 @@
+// This file is part of Substrate.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use super::helper;
+use syn::spanned::Spanned;
+
+/// The definition of the pallet inherent implementation.
+pub struct InherentDef {
+	/// A set of usage of instance, must be check for consistency with trait.
+	pub instances: Vec<helper::InstanceUsage>,
+}
+
+impl InherentDef {
+	pub fn try_from(item: &mut syn::Item) -> syn::Result<Self> {
+		let item = if let syn::Item::Impl(item) = item {
+			item
+		} else {
+			let msg = "Invalid pallet::inherent, expected item impl";
+			return Err(syn::Error::new(item.span(), msg));
+		};
+
+		if item.trait_.is_none() {
+			let msg = "Invalid pallet::inherent, expected impl<..> ProvideInherent for Pallet<..>";
+			return Err(syn::Error::new(item.span(), msg));
+		}
+
+		if let Some(last) = item.trait_.as_ref().unwrap().1.segments.last() {
+			if last.ident != "ProvideInherent" {
+				let msg = "Invalid pallet::inherent, expected trait ProvideInherent";
+				return Err(syn::Error::new(last.span(), msg));
+			}
+		} else {
+			let msg = "Invalid pallet::inherent, expected impl<..> ProvideInherent for Pallet<..>";
+			return Err(syn::Error::new(item.span(), msg));
+		}
+
+		let instances = vec![
+			helper::check_pallet_struct_usage(&item.self_ty)?,
+			helper::check_impl_gen(&item.generics, item.impl_token.span())?,
+		];
+
+		Ok(InherentDef { instances })
+	}
+}