Anki/rslib/src/scheduler/queue/builder/sorting.rs
Damien Elmes 2c6b6734b5 experimental queue building
Still a work in progress, and hidden behind a feature flag.
2021-03-01 12:18:21 +10:00

71 lines
2.4 KiB
Rust

// Copyright: Ankitects Pty Ltd and contributors
// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
use super::{DueCard, NewCard, NewCardOrder, QueueBuilder, ReviewCardOrder};
use fnv::FnvHasher;
use std::{cmp::Ordering, hash::Hasher};
impl QueueBuilder {
pub(super) fn sort_new(&mut self) {
match self.new_order {
NewCardOrder::Random => {
self.new.iter_mut().for_each(NewCard::hash_id_and_mtime);
self.new.sort_unstable_by(|a, b| a.extra.cmp(&b.extra));
}
NewCardOrder::Due => {
self.new.sort_unstable_by(|a, b| a.due.cmp(&b.due));
}
}
}
pub(super) fn sort_reviews(&mut self) {
self.review.iter_mut().for_each(DueCard::hash_id_and_mtime);
self.day_learning
.iter_mut()
.for_each(DueCard::hash_id_and_mtime);
match self.review_order {
ReviewCardOrder::ShuffledByDay => {
self.review.sort_unstable_by(shuffle_by_day);
self.day_learning.sort_unstable_by(shuffle_by_day);
}
ReviewCardOrder::Shuffled => {
self.review.sort_unstable_by(|a, b| a.extra.cmp(&b.extra));
self.day_learning
.sort_unstable_by(|a, b| a.extra.cmp(&b.extra));
}
ReviewCardOrder::IntervalsAscending => {
// fixme: implement; may require separate field if we want
// to shuffle cards that share an interval
}
ReviewCardOrder::IntervalsDescending => {
// fixme: implement; may require separate field if we want
// to shuffle cards that share an interval
}
}
}
}
// We sort based on a hash so that if the queue is rebuilt, remaining
// cards come back in the same order.
impl DueCard {
fn hash_id_and_mtime(&mut self) {
let mut hasher = FnvHasher::default();
hasher.write_i64(self.id.0);
hasher.write_i64(self.mtime.0);
self.extra = hasher.finish();
}
}
impl NewCard {
fn hash_id_and_mtime(&mut self) {
let mut hasher = FnvHasher::default();
hasher.write_i64(self.id.0);
hasher.write_i64(self.mtime.0);
self.extra = hasher.finish();
}
}
fn shuffle_by_day(a: &DueCard, b: &DueCard) -> Ordering {
(a.due, a.extra).cmp(&(b.due, b.extra))
}