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|
/// A sorted map that allows multiple values for each key.
pub use dup_tree_map::DupTreeMap;
mod one_or_more {
use either::Either;
use std::{iter, slice, vec};
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum OneOrMore<T> {
One(T),
More(Vec<T>),
}
pub type Iter<'a, T> = Either<slice::Iter<'a, T>, iter::Once<&'a T>>;
pub type IntoIter<T> = Either<vec::IntoIter<T>, iter::Once<T>>;
impl<T> OneOrMore<T> {
pub fn new(x: T) -> Self {
OneOrMore::One(x)
}
pub fn push(&mut self, x: T) {
take_mut::take(self, |sef| match sef {
OneOrMore::More(mut vec) => {
vec.push(x);
OneOrMore::More(vec)
}
OneOrMore::One(one) => OneOrMore::More(vec![one, x]),
})
}
pub fn iter(&self) -> Iter<'_, T> {
match self {
OneOrMore::More(vec) => Either::Left(vec.iter()),
OneOrMore::One(x) => Either::Right(iter::once(x)),
}
}
}
impl<T> IntoIterator for OneOrMore<T> {
type Item = T;
type IntoIter = IntoIter<T>;
fn into_iter(self) -> Self::IntoIter {
match self {
OneOrMore::More(vec) => Either::Left(vec.into_iter()),
OneOrMore::One(x) => Either::Right(iter::once(x)),
}
}
}
}
mod dup_tree_map {
use super::one_or_more;
use super::one_or_more::OneOrMore;
use std::collections::{btree_map, BTreeMap};
use std::iter;
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct DupTreeMap<K, V> {
map: BTreeMap<K, OneOrMore<V>>,
size: usize,
}
pub type IterInternal<'a, K, V> =
iter::Zip<iter::Repeat<&'a K>, one_or_more::Iter<'a, V>>;
pub type Iter<'a, K, V> = iter::FlatMap<
btree_map::Iter<'a, K, OneOrMore<V>>,
IterInternal<'a, K, V>,
for<'b> fn((&'b K, &'b OneOrMore<V>)) -> IterInternal<'b, K, V>,
>;
pub type IntoIterInternal<K, V> =
iter::Zip<iter::Repeat<K>, one_or_more::IntoIter<V>>;
pub type IntoIter<K, V> = iter::FlatMap<
btree_map::IntoIter<K, OneOrMore<V>>,
IntoIterInternal<K, V>,
fn((K, OneOrMore<V>)) -> IntoIterInternal<K, V>,
>;
impl<K, V> DupTreeMap<K, V> {
pub fn new() -> Self
where
K: Ord,
{
DupTreeMap {
map: BTreeMap::new(),
size: 0,
}
}
pub fn insert(&mut self, key: K, value: V)
where
K: Ord,
{
use std::collections::btree_map::Entry;
match self.map.entry(key) {
Entry::Vacant(e) => {
e.insert(OneOrMore::new(value));
}
Entry::Occupied(mut e) => e.get_mut().push(value),
}
}
pub fn len(&self) -> usize {
self.size
}
pub fn is_empty(&self) -> bool {
self.size == 0
}
pub fn iter(&self) -> Iter<'_, K, V>
where
K: Ord,
{
fn foo<'a, K, V>(
(k, oom): (&'a K, &'a OneOrMore<V>),
) -> IterInternal<'a, K, V> {
iter::repeat(k).zip(oom.iter())
}
self.map.iter().flat_map(foo)
}
}
impl<K, V> Default for DupTreeMap<K, V>
where
K: Ord,
{
fn default() -> Self {
Self::new()
}
}
impl<K, V> IntoIterator for DupTreeMap<K, V>
where
K: Ord + Clone,
{
type Item = (K, V);
type IntoIter = IntoIter<K, V>;
fn into_iter(self) -> Self::IntoIter {
fn foo<K, V>((k, oom): (K, OneOrMore<V>)) -> IntoIterInternal<K, V>
where
K: Clone,
{
iter::repeat(k).zip(oom.into_iter())
}
self.map.into_iter().flat_map(foo)
}
}
impl<'a, K, V> IntoIterator for &'a DupTreeMap<K, V>
where
K: Ord,
{
type Item = (&'a K, &'a V);
type IntoIter = Iter<'a, K, V>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
impl<K, V> iter::FromIterator<(K, V)> for DupTreeMap<K, V>
where
K: Ord,
{
fn from_iter<T>(iter: T) -> Self
where
T: IntoIterator<Item = (K, V)>,
{
let mut map = DupTreeMap::new();
for (k, v) in iter {
map.insert(k, v);
}
map
}
}
}
|
