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import codemap::span;
import ext::base::ext_ctxt;
import ast::tt_delim;
import parse::lexer::{new_tt_reader, reader};
import parse::parser::{parser, SOURCE_FILE};
import parse::common::parser_common;
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(), SOURCE_FILE);
let arg = rust_parser.parse_ident();
match arg {
@~"true" => cx.set_trace_macros(true),
@~"false" => cx.set_trace_macros(false),
_ => cx.span_fatal(sp, ~"trace_macros! only accepts `true` or `false`")
}
let rust_parser = parser(sess, cfg, rdr.dup(), SOURCE_FILE);
let result = rust_parser.parse_expr();
base::mr_expr(result)
}
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