93b642d974
#[plugin] #[no_link] extern crate bleh;
becomes a crate attribute
#![plugin(bleh)]
The feature gate is still required.
It's almost never correct to link a plugin into the resulting library /
executable, because it will bring all of libsyntax and librustc with it.
However if you really want this behavior, you can get it with a separate
`extern crate` item in addition to the `plugin` attribute.
Fixes #21043.
Fixes #20769.
[breaking-change]
51 lines
1.6 KiB
Rust
51 lines
1.6 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// force-host
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#![feature(plugin_registrar)]
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#![feature(box_syntax)]
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extern crate syntax;
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extern crate rustc;
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use std::borrow::ToOwned;
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use syntax::ast;
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use syntax::codemap::Span;
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use syntax::ext::build::AstBuilder;
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use syntax::ext::base::{TTMacroExpander, ExtCtxt, MacResult, MacExpr, NormalTT};
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use syntax::parse::token;
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use syntax::print::pprust;
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use syntax::ptr::P;
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use rustc::plugin::Registry;
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struct Expander {
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args: Vec<P<ast::MetaItem>>,
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}
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impl TTMacroExpander for Expander {
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fn expand<'cx>(&self,
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ecx: &'cx mut ExtCtxt,
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sp: Span,
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_: &[ast::TokenTree]) -> Box<MacResult+'cx> {
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let args = self.args.iter().map(|i| pprust::meta_item_to_string(&*i))
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.collect::<Vec<_>>().connect(", ");
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let interned = token::intern_and_get_ident(&args[]);
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MacExpr::new(ecx.expr_str(sp, interned))
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}
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}
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#[plugin_registrar]
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pub fn plugin_registrar(reg: &mut Registry) {
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let args = reg.args().clone();
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reg.register_syntax_extension(token::intern("plugin_args"),
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NormalTT(box Expander { args: args, }, None));
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}
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