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1 | // Copyright 2015 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. | |
4 | // | |
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. | |
10 | ||
11 | // force-host | |
12 | ||
13 | #![feature(plugin_registrar)] | |
c34b1796 | 14 | #![feature(box_syntax, rustc_private)] |
1a4d82fc JJ |
15 | |
16 | extern crate syntax; | |
17 | extern crate rustc; | |
18 | ||
19 | use std::borrow::ToOwned; | |
20 | use syntax::ast; | |
21 | use syntax::codemap::Span; | |
22 | use syntax::ext::build::AstBuilder; | |
c34b1796 | 23 | use syntax::ext::base::{TTMacroExpander, ExtCtxt, MacResult, MacEager, NormalTT}; |
1a4d82fc JJ |
24 | use syntax::parse::token; |
25 | use syntax::print::pprust; | |
26 | use syntax::ptr::P; | |
27 | use rustc::plugin::Registry; | |
28 | ||
29 | struct Expander { | |
85aaf69f | 30 | args: Vec<P<ast::MetaItem>>, |
1a4d82fc JJ |
31 | } |
32 | ||
33 | impl TTMacroExpander for Expander { | |
34 | fn expand<'cx>(&self, | |
35 | ecx: &'cx mut ExtCtxt, | |
36 | sp: Span, | |
37 | _: &[ast::TokenTree]) -> Box<MacResult+'cx> { | |
85aaf69f | 38 | let args = self.args.iter().map(|i| pprust::meta_item_to_string(&*i)) |
c1a9b12d | 39 | .collect::<Vec<_>>().join(", "); |
85aaf69f | 40 | let interned = token::intern_and_get_ident(&args[..]); |
c34b1796 | 41 | MacEager::expr(ecx.expr_str(sp, interned)) |
1a4d82fc JJ |
42 | } |
43 | } | |
44 | ||
45 | #[plugin_registrar] | |
46 | pub fn plugin_registrar(reg: &mut Registry) { | |
47 | let args = reg.args().clone(); | |
48 | reg.register_syntax_extension(token::intern("plugin_args"), | |
c34b1796 AL |
49 | // FIXME (#22405): Replace `Box::new` with `box` here when/if possible. |
50 | NormalTT(Box::new(Expander { args: args, }), None, false)); | |
1a4d82fc | 51 | } |