38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use rustc::dep_graph::DepNode;
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use rustc::hir::intravisit::Visitor;
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use rustc::hir::map::Map;
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use rustc::hir;
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use syntax::ast;
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use syntax::attr;
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pub fn find(hir_map: &Map) -> Option<ast::NodeId> {
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let _task = hir_map.dep_graph.in_task(DepNode::PluginRegistrar);
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let krate = hir_map.krate();
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let mut finder = Finder { registrar: None };
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krate.visit_all_items(&mut finder);
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finder.registrar
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}
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struct Finder {
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registrar: Option<ast::NodeId>,
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}
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impl<'v> Visitor<'v> for Finder {
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fn visit_item(&mut self, item: &hir::Item) {
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if attr::contains_name(&item.attrs, "rustc_derive_registrar") {
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self.registrar = Some(item.id);
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}
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}
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}
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