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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 codemap::span;
use ext::base::ext_ctxt;
use ast::tt_delim;
use parse::lexer::{new_tt_reader, reader};
use parse::parser::Parser;
fn expand_trace_macros(cx: ext_ctxt, sp: span,
tt: ~[ast::token_tree]) -> base::mac_result
{
let sess = cx.parse_sess();
let cfg = cx.cfg();
let tt_rdr = new_tt_reader(cx.parse_sess().span_diagnostic,
cx.parse_sess().interner, None, tt);
let rdr = tt_rdr as reader;
let rust_parser = Parser(sess, cfg, rdr.dup());
if rust_parser.is_keyword(~"true") {
cx.set_trace_macros(true);
} else if rust_parser.is_keyword(~"false") {
cx.set_trace_macros(false);
} else {
cx.span_fatal(sp, ~"trace_macros! only accepts `true` or `false`")
}
rust_parser.bump();
let rust_parser = Parser(sess, cfg, rdr.dup());
let result = rust_parser.parse_expr();
base::mr_expr(result)
}
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