mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Bastian Köcher
52 lines
1.8 KiB
Rust
52 lines
1.8 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2020-2022 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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//! Implementation for pallet attribute macro.
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//!
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//! General workflow:
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//! 1 - parse all pallet attributes:
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//! This step remove all attributes `#[pallet::*]` from the ItemMod and build the `Def` struct
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//! which holds the ItemMod without `#[pallet::*]` and information given by those attributes
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//! 2 - expand from the parsed information
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//! This step will modify the ItemMod by adding some derive attributes or phantom data variants
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//! to user defined types. And also crate new types and implement block.
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mod expand;
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mod parse;
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pub use parse::Def;
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use syn::spanned::Spanned;
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pub fn pallet(
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attr: proc_macro::TokenStream,
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item: proc_macro::TokenStream,
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) -> proc_macro::TokenStream {
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if !attr.is_empty() {
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let msg =
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"Invalid pallet macro call: expected no attributes, e.g. macro call must be just \
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`#[frame_support::pallet]` or `#[pallet]`";
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let span = proc_macro2::TokenStream::from(attr).span();
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return syn::Error::new(span, msg).to_compile_error().into()
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}
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let item = syn::parse_macro_input!(item as syn::ItemMod);
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match parse::Def::try_from(item) {
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Ok(def) => expand::expand(def).into(),
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Err(e) => e.to_compile_error().into(),
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}
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}
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