rust/src/test/auxiliary/lint_plugin_test.rs

// Copyright 2014 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.

// force-host

#![feature(plugin_registrar)]
#![feature(box_syntax)]

extern crate syntax;

// Load rustc as a plugin to get macros
#[macro_use]
extern crate rustc;

use syntax::ast;
use syntax::parse::token;
use rustc::lint::{Context, LintPass, LintPassObject, LintArray};
use rustc::plugin::Registry;

declare_lint!(TEST_LINT, Warn, "Warn about items named 'lintme'");

struct Pass;

impl LintPass for Pass {
    fn get_lints(&self) -> LintArray {
        lint_array!(TEST_LINT)
    }

    fn check_item(&mut self, cx: &Context, it: &ast::Item) {
        let name = token::get_ident(it.ident);
        if &name[..] == "lintme" {
            cx.span_lint(TEST_LINT, it.span, "item is named 'lintme'");
        }
    }
}

#[plugin_registrar]
pub fn plugin_registrar(reg: &mut Registry) {
    reg.register_lint_pass(box Pass as LintPassObject);
}