mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-27 10:27:59 +00:00
Bastian Köcher
121 lines
3.5 KiB
Rust
121 lines
3.5 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2017-2022 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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// tag::description[]
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//! Proc macro helpers for procedural macros
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// end::description[]
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// reexport proc macros
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pub use frame_support_procedural_tools_derive::*;
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use proc_macro_crate::{crate_name, FoundCrate};
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use quote::quote;
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use syn::parse::Error;
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pub mod syn_ext;
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// FIXME #1569, remove the following functions, which are copied from sp-api-macros
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use proc_macro2::{Span, TokenStream};
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use syn::Ident;
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fn generate_hidden_includes_mod_name(unique_id: &str) -> Ident {
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Ident::new(&format!("sp_api_hidden_includes_{}", unique_id), Span::call_site())
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}
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/// Generates the access to the `frame-support` crate.
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pub fn generate_crate_access(unique_id: &str, def_crate: &str) -> TokenStream {
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if std::env::var("CARGO_PKG_NAME").unwrap() == def_crate {
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quote::quote!(frame_support)
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} else {
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let mod_name = generate_hidden_includes_mod_name(unique_id);
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quote::quote!( self::#mod_name::hidden_include )
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}
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}
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/// Generate the crate access for the crate using 2018 syntax.
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///
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/// for `frame-support` output will for example be `frame_support`.
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pub fn generate_crate_access_2018(def_crate: &str) -> Result<syn::Ident, Error> {
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match crate_name(def_crate) {
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Ok(FoundCrate::Itself) => {
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let name = def_crate.to_string().replace("-", "_");
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Ok(syn::Ident::new(&name, Span::call_site()))
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},
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Ok(FoundCrate::Name(name)) => Ok(Ident::new(&name, Span::call_site())),
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Err(e) => Err(Error::new(Span::call_site(), e)),
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}
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}
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/// Generates the hidden includes that are required to make the macro independent from its scope.
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pub fn generate_hidden_includes(unique_id: &str, def_crate: &str) -> TokenStream {
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let mod_name = generate_hidden_includes_mod_name(unique_id);
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match crate_name(def_crate) {
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Ok(FoundCrate::Itself) => quote!(),
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Ok(FoundCrate::Name(name)) => {
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let name = Ident::new(&name, Span::call_site());
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quote::quote!(
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#[doc(hidden)]
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mod #mod_name {
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pub extern crate #name as hidden_include;
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}
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)
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},
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Err(e) => {
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let err = Error::new(Span::call_site(), e).to_compile_error();
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quote!( #err )
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},
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}
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}
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// fn to remove white spaces around string types
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// (basically whitespaces around tokens)
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pub fn clean_type_string(input: &str) -> String {
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input
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.replace(" ::", "::")
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.replace(":: ", "::")
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.replace(" ,", ",")
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.replace(" ;", ";")
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.replace(" [", "[")
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.replace("[ ", "[")
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.replace(" ]", "]")
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.replace(" (", "(")
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.replace("( ", "(")
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.replace(" )", ")")
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.replace(" <", "<")
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.replace("< ", "<")
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.replace(" >", ">")
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}
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/// Return all doc attributes literals found.
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pub fn get_doc_literals(attrs: &[syn::Attribute]) -> Vec<syn::Lit> {
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attrs
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.iter()
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.filter_map(|attr| {
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if let Ok(syn::Meta::NameValue(meta)) = attr.parse_meta() {
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if meta.path.get_ident().map_or(false, |ident| ident == "doc") {
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Some(meta.lit)
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} else {
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None
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}
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} else {
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None
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}
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})
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.collect()
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}
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