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use std::hash::{Hash, Hasher};
use std::iter::FromIterator;
use crate::stable_hasher::{HashStable, StableHasher};
use rustc_index::vec::{Idx, IndexVec};
#[derive(Clone, Debug)]
pub struct SortedIndexMultiMap<I: Idx, K, V> {
items: IndexVec<I, (K, V)>,
idx_sorted_by_item_key: Vec<I>,
}
impl<I: Idx, K: Ord, V> SortedIndexMultiMap<I, K, V> {
#[inline]
pub fn new() -> Self {
SortedIndexMultiMap { items: IndexVec::new(), idx_sorted_by_item_key: Vec::new() }
}
#[inline]
pub fn len(&self) -> usize {
self.items.len()
}
#[inline]
pub fn is_empty(&self) -> bool {
self.items.is_empty()
}
#[inline]
pub fn into_iter(self) -> impl DoubleEndedIterator<Item = (K, V)> {
self.items.into_iter()
}
#[inline]
pub fn into_iter_enumerated(self) -> impl DoubleEndedIterator<Item = (I, (K, V))> {
self.items.into_iter_enumerated()
}
#[inline]
pub fn iter(&self) -> impl '_ + DoubleEndedIterator<Item = (&K, &V)> {
self.items.iter().map(|(ref k, ref v)| (k, v))
}
#[inline]
pub fn iter_enumerated(&self) -> impl '_ + DoubleEndedIterator<Item = (I, (&K, &V))> {
self.items.iter_enumerated().map(|(i, (ref k, ref v))| (i, (k, v)))
}
#[inline]
pub fn get(&self, idx: I) -> Option<&(K, V)> {
self.items.get(idx)
}
#[inline]
pub fn get_by_key(&self, key: K) -> impl Iterator<Item = &V> + '_ {
self.get_by_key_enumerated(key).map(|(_, v)| v)
}
#[inline]
pub fn get_by_key_enumerated(&self, key: K) -> impl Iterator<Item = (I, &V)> + '_ {
let lower_bound = self.idx_sorted_by_item_key.partition_point(|&i| self.items[i].0 < key);
self.idx_sorted_by_item_key[lower_bound..].iter().map_while(move |&i| {
let (k, v) = &self.items[i];
(k == &key).then_some((i, v))
})
}
}
impl<I: Idx, K: Eq, V: Eq> Eq for SortedIndexMultiMap<I, K, V> {}
impl<I: Idx, K: PartialEq, V: PartialEq> PartialEq for SortedIndexMultiMap<I, K, V> {
fn eq(&self, other: &Self) -> bool {
self.items == other.items
}
}
impl<I: Idx, K, V> Hash for SortedIndexMultiMap<I, K, V>
where
K: Hash,
V: Hash,
{
fn hash<H: Hasher>(&self, hasher: &mut H) {
self.items.hash(hasher)
}
}
impl<I: Idx, K, V, C> HashStable<C> for SortedIndexMultiMap<I, K, V>
where
K: HashStable<C>,
V: HashStable<C>,
{
fn hash_stable(&self, ctx: &mut C, hasher: &mut StableHasher) {
self.items.hash_stable(ctx, hasher)
}
}
impl<I: Idx, K: Ord, V> FromIterator<(K, V)> for SortedIndexMultiMap<I, K, V> {
fn from_iter<J>(iter: J) -> Self
where
J: IntoIterator<Item = (K, V)>,
{
let items = IndexVec::from_iter(iter);
let mut idx_sorted_by_item_key: Vec<_> = items.indices().collect();
idx_sorted_by_item_key.sort_by_key(|&idx| &items[idx].0);
SortedIndexMultiMap { items, idx_sorted_by_item_key }
}
}
impl<I: Idx, K, V> std::ops::Index<I> for SortedIndexMultiMap<I, K, V> {
type Output = V;
fn index(&self, idx: I) -> &Self::Output {
&self.items[idx].1
}
}