// Copyright Materialize, Inc. and contributors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License in the LICENSE file at the
// root of this repository, or online at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::fmt::{Display, Error, Formatter};
use timely::progress::frontier::{Antichain, AntichainRef, MutableAntichain};
pub trait AntichainExt {
type Pretty<'a>: Display
where
Self: 'a;
fn pretty(&self) -> Self::Pretty<'_>;
}
impl<T: Display + 'static> AntichainExt for Antichain<T> {
type Pretty<'a> = FrontierPrinter<AntichainRef<'a, T>>;
fn pretty(&self) -> Self::Pretty<'_> {
self.borrow().pretty()
}
}
impl<T: Display + 'static> AntichainExt for MutableAntichain<T> {
type Pretty<'a> = FrontierPrinter<AntichainRef<'a, T>>;
fn pretty(&self) -> Self::Pretty<'_> {
self.frontier().pretty()
}
}
impl<'a, T: Display> AntichainExt for AntichainRef<'a, T> {
type Pretty<'b>
= FrontierPrinter<Self>
where
Self: 'b;
fn pretty(&self) -> Self::Pretty<'a> {
FrontierPrinter(*self)
}
}
pub struct FrontierPrinter<F>(F);
impl<'a, T: Display> Display for FrontierPrinter<AntichainRef<'a, T>> {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
f.write_str("{")?;
let mut time_iter = self.0.iter();
if let Some(t) = time_iter.next() {
t.fmt(f)?;
}
for t in time_iter {
f.write_str(", ")?;
t.fmt(f)?;
}
f.write_str("}")?;
Ok(())
}
}