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https://github.com/pezkuwichain/pezkuwi-subxt.git
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cheme
75 lines
2.4 KiB
Rust
75 lines
2.4 KiB
Rust
// Copyright 2017-2018 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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// tag::description[]
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//! Proc macro of Support code for the runtime.
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// end::description[]
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#![recursion_limit="256"]
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extern crate proc_macro;
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extern crate proc_macro2;
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#[macro_use]
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extern crate syn;
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#[macro_use]
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extern crate quote;
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#[macro_use]
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extern crate srml_support_procedural_tools;
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mod storage;
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use proc_macro::TokenStream;
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/// Declares strongly-typed wrappers around codec-compatible types in storage.
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///
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/// ## Example
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///
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/// ```nocompile
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/// decl_storage! {
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/// trait Store for Module<T: Trait> as Example {
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/// Dummy get(dummy) config(): Option<T::Balance>;
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/// Foo get(foo) config(): T::Balance;
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/// }
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/// }
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/// ```
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///
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/// For now we implement a convenience trait with pre-specialised associated types, one for each
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/// storage item. This allows you to gain access to publicly visible storage items from a
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/// module type. Currently you must disambiguate by using `<Module as Store>::Item` rather than
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/// the simpler `Module::Item`. Hopefully the rust guys with fix this soon.
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///
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/// An optional `GenesisConfig` struct for storage initialization can be defined, either specifically as in :
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/// ```nocompile
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/// decl_storage! {
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/// trait Store for Module<T: Trait> as Example {
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/// }
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/// add_extra_genesis {
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/// config(genesis_field): GenesisFieldType;
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/// build(|_: &mut StorageMap, _: &mut ChildrenStorageMap, _: &GenesisConfig<T>| {
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/// })
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/// }
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/// }
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/// ```
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/// or when at least one storage field requires default initialization (both `get` and `config` or `build`).
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/// This struct can be expose as `Config` by `decl_runtime` macro.
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#[proc_macro]
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pub fn decl_storage(input: TokenStream) -> TokenStream {
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storage::transformation::decl_storage_impl(input)
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}
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