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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use ast;
use codemap::Span;
use ext::base::*;
use ext::base;
use owned_slice::OwnedSlice;
use parse::token;
use parse::token::{str_to_ident};
pub fn expand_syntax_ext(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
-> base::MacResult {
let mut res_str = ~"";
for (i, e) in tts.iter().enumerate() {
if i & 1 == 1 {
match *e {
ast::TTTok(_, token::COMMA) => (),
_ => {
cx.span_err(sp, "concat_idents! expecting comma.");
return MacResult::dummy_expr(sp);
}
}
} else {
match *e {
ast::TTTok(_, token::IDENT(ident,_)) => {
res_str.push_str(token::get_ident(ident).get())
}
_ => {
cx.span_err(sp, "concat_idents! requires ident args.");
return MacResult::dummy_expr(sp);
}
}
}
}
let res = str_to_ident(res_str);
let e = @ast::Expr {
id: ast::DUMMY_NODE_ID,
node: ast::ExprPath(
ast::Path {
span: sp,
global: false,
segments: vec!(
ast::PathSegment {
identifier: res,
lifetimes: Vec::new(),
types: OwnedSlice::empty(),
}
)
}
),
span: sp,
};
MRExpr(e)
}
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