64 lines
1.9 KiB
Rust
64 lines
1.9 KiB
Rust
// Copyright 2012-2013 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 ast;
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use attr;
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use codemap::Span;
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use diagnostic;
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use visit;
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use visit::Visitor;
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use std::vec_ng::Vec;
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struct MacroRegistrarContext {
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registrars: Vec<(ast::NodeId, Span)> ,
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}
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impl Visitor<()> for MacroRegistrarContext {
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fn visit_item(&mut self, item: &ast::Item, _: ()) {
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match item.node {
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ast::ItemFn(..) => {
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if attr::contains_name(item.attrs.as_slice(),
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"macro_registrar") {
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self.registrars.push((item.id, item.span));
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}
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}
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_ => {}
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}
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visit::walk_item(self, item, ());
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}
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}
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pub fn find_macro_registrar(diagnostic: @diagnostic::SpanHandler,
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krate: &ast::Crate) -> Option<ast::DefId> {
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let mut ctx = MacroRegistrarContext { registrars: Vec::new() };
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visit::walk_crate(&mut ctx, krate, ());
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match ctx.registrars.len() {
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0 => None,
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1 => {
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let (node_id, _) = ctx.registrars.pop().unwrap();
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Some(ast::DefId {
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krate: ast::LOCAL_CRATE,
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node: node_id
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})
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},
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_ => {
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diagnostic.handler().err("multiple macro registration functions found");
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for &(_, span) in ctx.registrars.iter() {
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diagnostic.span_note(span, "one is here");
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}
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diagnostic.handler().abort_if_errors();
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unreachable!();
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}
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}
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}
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