1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
15 use owned_slice::OwnedSlice;
17 use parse::token::{str_to_ident};
20 pub fn expand_syntax_ext<'cx>(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
21 -> Box<base::MacResult+'cx> {
22 let mut res_str = String::new();
23 for (i, e) in tts.iter().enumerate() {
26 ast::TTTok(_, token::COMMA) => (),
28 cx.span_err(sp, "concat_idents! expecting comma.");
29 return DummyResult::expr(sp);
34 ast::TTTok(_, token::IDENT(ident,_)) => {
35 res_str.push_str(token::get_ident(ident).get())
38 cx.span_err(sp, "concat_idents! requires ident args.");
39 return DummyResult::expr(sp);
44 let res = str_to_ident(res_str.as_slice());
47 id: ast::DUMMY_NODE_ID,
55 lifetimes: Vec::new(),
56 types: OwnedSlice::empty(),