1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
// 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::ext_ctxt;
use ext::base;
use parse::lexer::{new_tt_reader, reader};
use parse::parser::Parser;
pub fn expand_trace_macros(cx: @ext_ctxt,
sp: span,
tt: &[ast::token_tree])
-> base::MacResult {
let sess = cx.parse_sess();
let cfg = cx.cfg();
let tt_rdr = new_tt_reader(
copy cx.parse_sess().span_diagnostic,
cx.parse_sess().interner,
None,
vec::from_slice(tt)
);
let rdr = tt_rdr as @reader;
let rust_parser = Parser(
sess,
copy 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::MRExpr(result)
}
|
