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// Copyright (C) 2017-2019 Baidu, Inc. All Rights Reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions // are met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above copyright // notice, this list of conditions and the following disclaimer in // the documentation and/or other materials provided with the // distribution. // * Neither the name of Baidu, Inc., nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. use std::fmt::Display; use std::cell::RefCell; #[derive(Default)] pub struct Ctxt { errors: RefCell<Option<Vec<String>>>, } impl Ctxt { pub fn new() -> Self { Ctxt { errors: RefCell::new(Some(Vec::new())) } } pub fn error<T: Display>(&self, msg: T) { self.errors .borrow_mut() .as_mut() .unwrap() .push(msg.to_string()); } pub fn check(self) -> Result<(), String> { let mut errors = self.errors.borrow_mut().take().unwrap(); match errors.len() { 0 => Ok(()), 1 => Err(errors.pop().unwrap()), n => { let mut msg = format!("{} errors:", n); for err in errors { msg.push_str("\n\t# "); msg.push_str(&err); } Err(msg) } } } } impl Drop for Ctxt { fn drop(&mut self) { if self.errors.borrow().is_some() { panic!("forgot to check for errors"); } } }