1 // Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
13 #![feature(globs, plugin_registrar, macro_rules, quote)]
18 use syntax::ast::{TokenTree, Item, MetaItem};
19 use syntax::codemap::Span;
20 use syntax::ext::base::*;
21 use syntax::parse::token;
24 use rustc::plugin::Registry;
27 macro_rules! exported_macro (() => (2i))
29 macro_rules! unexported_macro (() => (3i))
32 pub fn plugin_registrar(reg: &mut Registry) {
33 reg.register_macro("make_a_1", expand_make_a_1);
34 reg.register_macro("forged_ident", expand_forged_ident);
35 reg.register_macro("identity", expand_identity);
36 reg.register_syntax_extension(
37 token::intern("into_foo"),
38 Modifier(box expand_into_foo));
41 fn expand_make_a_1(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree])
42 -> Box<MacResult+'static> {
44 cx.span_fatal(sp, "make_a_1 takes no arguments");
46 MacExpr::new(quote_expr!(cx, 1i))
50 fn expand_identity(cx: &mut ExtCtxt, _span: Span, tts: &[TokenTree])
51 -> Box<MacResult+'static> {
52 // Parse an expression and emit it unchanged.
53 let mut parser = parse::new_parser_from_tts(cx.parse_sess(),
54 cx.cfg(), Vec::from_slice(tts));
55 let expr = parser.parse_expr();
56 MacExpr::new(quote_expr!(&mut *cx, $expr))
59 fn expand_into_foo(cx: &mut ExtCtxt, sp: Span, attr: &MetaItem, it: P<Item>)
62 attrs: it.attrs.clone(),
63 ..(*quote_item!(cx, enum Foo { Bar, Baz }).unwrap()).clone()
67 fn expand_forged_ident(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree]) -> Box<MacResult+'static> {
68 use syntax::ext::quote::rt::*;
71 cx.span_fatal(sp, "forged_ident takes no arguments");
74 // Most of this is modelled after the expansion of the `quote_expr!`
76 let parse_sess = cx.parse_sess();
79 // ... except this is where we inject a forged identifier,
80 // and deliberately do not call `cx.parse_tts_with_hygiene`
81 // (because we are testing that this will be *rejected*
82 // by the default parser).
85 let tt = cx.parse_tts("\x00name_2,ctxt_0\x00".to_string());
86 let mut parser = new_parser_from_tts(parse_sess, cfg, tt);