mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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yjh
aad80cce31
Since the hash rules of this part of the `pallet_prefix/storage_prefix` are always fixed, we can put the runtime calculation into compile time. --- polkadot address: 15ouFh2SHpGbHtDPsJ6cXQfes9Cx1gEFnJJsJVqPGzBSTudr --------- Co-authored-by: Juan <juangirini@gmail.com> Co-authored-by: command-bot <> Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
62 lines
2.2 KiB
Rust
62 lines
2.2 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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//! 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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pub(crate) mod parse;
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pub use parse::{composite::keyword::CompositeKeyword, Def};
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use syn::spanned::Spanned;
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mod keyword {
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syn::custom_keyword!(dev_mode);
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}
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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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let mut dev_mode = false;
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if !attr.is_empty() {
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if let Ok(_) = syn::parse::<keyword::dev_mode>(attr.clone()) {
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dev_mode = true;
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} else {
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let msg = "Invalid pallet macro call: unexpected attribute. Macro call must be \
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bare, such as `#[frame_support::pallet]` or `#[pallet]`, or must specify the \
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`dev_mode` attribute, such as `#[frame_support::pallet(dev_mode)]` or \
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#[pallet(dev_mode)].";
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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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}
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let item = syn::parse_macro_input!(item as syn::ItemMod);
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match parse::Def::try_from(item, dev_mode) {
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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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