mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-28 12:07:57 +00:00
Bastian Köcher
f9975af020
Procedural do not support `$crate` to get access to the crate where the macro is defined. We use a hack to re-export the crate under a known name. With rust edition 2018, people started to rename their crates in `Cargo.toml`, but that breaks the re-export. This commit introduces `proc-maco-crate` that supports finding the requested crate name, even if it was renamed.
116 lines
3.1 KiB
Rust
116 lines
3.1 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 helpers for procedural macros
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// end::description[]
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// reexport proc macros
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pub use srml_support_procedural_tools_derive::*;
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use proc_macro_crate::crate_name;
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use syn::parse::Error;
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use quote::quote;
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pub mod syn_ext;
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#[macro_export]
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macro_rules! custom_keyword_impl {
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($name:ident, $keyident:expr, $keydisp:expr) => {
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impl CustomKeyword for $name {
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fn ident() -> &'static str { $keyident }
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fn display() -> &'static str { $keydisp }
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}
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}
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}
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#[macro_export]
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macro_rules! custom_keyword {
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($name:ident, $keyident:expr, $keydisp:expr) => {
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#[derive(Debug)]
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struct $name;
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custom_keyword_impl!($name, $keyident, $keydisp);
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}
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}
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// FIXME #1569, remove the following functions, which are copied from sr-api-macros
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use proc_macro2::{TokenStream, Span};
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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!("sr_api_hidden_includes_{}", unique_id), Span::call_site())
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}
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/// Generates the access to the `srml-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!( crate )
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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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}.into()
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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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if ::std::env::var("CARGO_PKG_NAME").unwrap() == def_crate {
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TokenStream::new()
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} else {
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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(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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}.into()
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}
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// fn to remove white spaces arount string types
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// (basically whitespaces arount 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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