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.
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(plugin_registrar)]
14 #![feature(box_syntax, rustc_private)]
19 use std::borrow::ToOwned;
21 use syntax::codemap::Span;
22 use syntax::ext::build::AstBuilder;
23 use syntax::ext::base::{TTMacroExpander, ExtCtxt, MacResult, MacEager, NormalTT};
24 use syntax::parse::token;
25 use syntax::print::pprust;
27 use rustc::plugin::Registry;
30 args: Vec<P<ast::MetaItem>>,
33 impl TTMacroExpander for Expander {
35 ecx: &'cx mut ExtCtxt,
37 _: &[ast::TokenTree]) -> Box<MacResult+'cx> {
38 let args = self.args.iter().map(|i| pprust::meta_item_to_string(&*i))
39 .collect::<Vec<_>>().join(", ");
40 let interned = token::intern_and_get_ident(&args[..]);
41 MacEager::expr(ecx.expr_str(sp, interned))
46 pub fn plugin_registrar(reg: &mut Registry) {
47 let args = reg.args().clone();
48 reg.register_syntax_extension(token::intern("plugin_args"),
49 // FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
50 NormalTT(Box::new(Expander { args: args, }), None, false));