53 lines
1.6 KiB
Rust
53 lines
1.6 KiB
Rust
// Copyright 2012 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 core::prelude::*;
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use ext::base::*;
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use ext::base;
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fn expand_syntax_ext(cx: ext_ctxt, sp: span, tts: ~[ast::token_tree])
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-> base::MacResult {
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let mut res_str = ~"";
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for tts.eachi |i, e| {
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if i & 1 == 1 {
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match *e {
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ast::tt_tok(_, token::COMMA) => (),
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_ => cx.span_fatal(sp, ~"concat_idents! \
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expecting comma.")
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}
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} else {
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match *e {
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ast::tt_tok(_, token::IDENT(ident,_)) =>
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res_str += cx.str_of(ident),
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_ => cx.span_fatal(sp, ~"concat_idents! \
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requires ident args.")
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}
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}
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}
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let res = cx.parse_sess().interner.intern(@res_str);
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let e = @ast::expr {
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id: cx.next_id(),
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callee_id: cx.next_id(),
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node: ast::expr_path(
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@ast::path {
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span: sp,
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global: false,
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idents: ~[res],
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rp: None,
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types: ~[],
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}
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),
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span: sp,
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};
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MRExpr(e)
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}
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