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feat: add crate topola-gear-sectors 

`topola-gear-sectors` has license `MIT OR Apache-2.0`,
because it copies large amounts of code directly from
rusts `alloc` standard library.

It implements something like an associative map from
angles to arbitrary values, but also supports inspecting
the intervals between angles in the map.
This commit is contained in:
Alain Emilia Anna Zscheile 2025-01-04 22:33:06 +01:00
parent ea7c3a5e4b
commit 5d2abe5ec7
5 changed files with 541 additions and 0 deletions
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4
Cargo.toml
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@ -61,6 +61,10 @@ thiserror.workspace = true
path = "crates/specctra-core" path = "crates/specctra-core"
features = ["rstar"] features = ["rstar"]
[dependencies.topola-gear-sectors]
path = "crates/topola-gear-sectors"
features = ["serde"]
[dev-dependencies] [dev-dependencies]
serde_json.workspace = true serde_json.workspace = true

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LICENSES/Apache-2.0.txt Normal file
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crates/topola-gear-sectors/Cargo.toml Normal file
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@ -0,0 +1,20 @@
# SPDX-FileCopyrightText: 2024 Topola contributors
#
# SPDX-License-Identifier: MIT OR Apache-2.0
[package]
name = "topola-gear-sectors"
version = "0.1.0"
edition = "2021"
license = "MIT OR Apache-2.0"
[features]
serde = ["smallvec/serde", "dep:serde"]
[dependencies]
num-traits = "0.2"
smallvec = "1.13"
[dependencies.serde]
workspace = true
optional = true

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crates/topola-gear-sectors/src/entry.rs Normal file
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@ -0,0 +1,155 @@
// SPDX-FileCopyrightText: 2024 Topola contributors
//
// SPDX-License-Identifier: MIT OR Apache-2.0
//
// The entry API (interface) and part of the implementation is copied directly from
// Rust's `alloc::collections::btree_map::Entry` (January 2025).
// <https://doc.rust-lang.org/src/alloc/collections/btree/map/entry.rs.html>
use core::marker::PhantomData;
use smallvec::SmallVec;
pub enum Entry<'a, K: 'a, V: 'a> {
Occupied(OccupiedEntry<'a, K, V>),
Vacant(VacantEntry<'a, K, V>),
}
use Entry::*;
impl<'a, K: 'a, V: 'a> Entry<'a, K, V> {
pub fn position(&self) -> usize {
match self {
Occupied(entry) => entry.position(),
Vacant(entry) => entry.position(),
}
}
pub fn key(&self) -> &K {
match self {
Occupied(entry) => entry.key(),
Vacant(entry) => entry.key(),
}
}
pub fn and_modify<F: FnOnce(&mut V)>(self, f: F) -> Self {
match self {
Occupied(mut entry) => {
f(entry.get_mut());
Occupied(entry)
}
Vacant(entry) => Vacant(entry),
}
}
pub fn or_insert(self, default: V) -> &'a mut V {
match self {
Occupied(entry) => entry.into_mut(),
Vacant(entry) => entry.insert(default),
}
}
pub fn or_insert_with<F: FnOnce() -> V>(self, default: F) -> &'a mut V {
match self {
Occupied(entry) => entry.into_mut(),
Vacant(entry) => entry.insert(default()),
}
}
pub fn or_insert_with_key<F: FnOnce(&K) -> V>(self, default: F) -> &'a mut V {
match self {
Occupied(entry) => entry.into_mut(),
Vacant(entry) => {
let value = default(entry.key());
entry.insert(value)
}
}
}
}
pub struct OccupiedEntry<'a, K: 'a, V: 'a> {
pub(crate) parent: &'a mut SmallVec<[(K, V); 8]>,
pub(crate) pos: usize,
pub(crate) _marker: PhantomData<&'a mut (K, V)>,
}
impl<'a, K: 'a, V: 'a> OccupiedEntry<'a, K, V> {
#[inline(always)]
pub fn position(&self) -> usize {
self.pos
}
#[inline]
pub fn key(&self) -> &K {
&self.parent[self.pos].0
}
#[inline]
pub fn get(&self) -> &V {
&self.parent[self.pos].1
}
#[inline]
pub fn get_mut(&mut self) -> &mut V {
&mut self.parent[self.pos].1
}
#[inline]
pub fn into_mut(self) -> &'a mut V {
&mut self.parent[self.pos].1
}
#[inline]
pub fn remove_entry(self) -> (K, V) {
self.parent.remove(self.pos)
}
#[inline]
pub fn remove(self) -> V {
self.remove_entry().1
}
pub fn insert(&mut self, value: V) -> V {
core::mem::replace(&mut self.parent[self.pos].1, value)
}
}
pub struct VacantEntry<'a, K: 'a, V: 'a> {
pub(crate) parent: &'a mut SmallVec<[(K, V); 8]>,
pub(crate) pos: usize,
pub(crate) key: K,
pub(crate) _marker: PhantomData<&'a mut (K, V)>,
}
impl<'a, K: 'a, V: 'a> VacantEntry<'a, K, V> {
#[inline(always)]
pub fn position(&self) -> usize {
self.pos
}
#[inline(always)]
pub fn key(&self) -> &K {
&self.key
}
#[inline(always)]
pub fn into_key(self) -> K {
self.key
}
pub fn insert(self, value: V) -> &'a mut V {
self.parent.insert(self.pos, (self.key, value));
&mut self.parent[self.pos].1
}
pub fn insert_entry(self, value: V) -> OccupiedEntry<'a, K, V> {
let VacantEntry {
parent, pos, key, ..
} = self;
parent.insert(pos, (key, value));
OccupiedEntry {
parent,
pos,
_marker: PhantomData,
}
}
}

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crates/topola-gear-sectors/src/lib.rs Normal file
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// SPDX-FileCopyrightText: 2024 Topola contributors
//
// SPDX-License-Identifier: MIT OR Apache-2.0
use core::{cmp, marker::PhantomData, ops};
use num_traits::ConstZero;
use smallvec::SmallVec;
mod entry;
pub use entry::*;
/// Trait implemented by types which can be used to represent angles
pub trait Angle: Copy + cmp::PartialEq + ConstZero + ops::AddAssign + ops::SubAssign {
/// The value at which 1 winding is indicated
const TAU: Self;
/// A total comparison operator for angles
fn total_cmp(&self, oth: &Self) -> cmp::Ordering;
/// Returns true if the number is finite (e.g. [`canonicalize`] terminates normally and not `NaN`)
fn is_finite(&self) -> bool;
}
impl Angle for f64 {
const TAU: Self = core::f64::consts::TAU;
#[inline(always)]
fn total_cmp(&self, oth: &Self) -> cmp::Ordering {
f64::total_cmp(self, oth)
}
#[inline(always)]
fn is_finite(&self) -> bool {
num_traits::float::FloatCore::is_finite(*self)
}
}
impl Angle for f32 {
const TAU: Self = core::f32::consts::TAU;
#[inline(always)]
fn total_cmp(&self, oth: &Self) -> cmp::Ordering {
f32::total_cmp(self, oth)
}
#[inline(always)]
fn is_finite(&self) -> bool {
num_traits::float::FloatCore::is_finite(*self)
}
}
/// Turn an arbitrary angle into a canonical one (e.g. in range `[0, 2π)`).
///
/// Panics if passed a non-finite number.
// (If the [`Angle::is_finite`] implementation of `K` is invalid,
// it might infinitely loop instead, or cause undefined behavior.)
pub fn canonicalize<K: Angle>(key: &mut K) {
let mut key_ = *key;
assert!(key_.is_finite());
while key_.total_cmp(&<K as ConstZero>::ZERO) == cmp::Ordering::Less {
key_ += <K as Angle>::TAU;
}
while key_.total_cmp(&<K as Angle>::TAU) != cmp::Ordering::Less {
key_ -= <K as Angle>::TAU;
}
*key = key_;
}
/// Data structure for storing data (`V`) associated to angles (`K`).
///
/// Note that this can also be used to store the dual (faces) by storing
/// their data at the angle where that sector starts, or even both.
#[derive(Clone, Debug, Default, PartialEq, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
pub struct GearSectors<K, V> {
// entries ordered by `Angle::total_cmp`
secs: SmallVec<[(K, V); 8]>,
}
impl<K: Angle, V> GearSectors<K, V> {
pub fn new() -> Self {
Self {
secs: SmallVec::new(),
}
}
#[inline(always)]
pub fn secs(&self) -> &[(K, V)] {
&self.secs[..]
}
#[inline]
pub fn iter_mut<'a>(
&'a mut self,
) -> impl core::iter::ExactSizeIterator<Item = (&'a K, &'a mut V)> {
self.secs.iter_mut().map(|(k, v)| (&*k, v))
}
pub fn entry(&mut self, mut key: K) -> Entry<'_, K, V> {
canonicalize(&mut key);
match self.secs.binary_search_by(|ent| ent.0.total_cmp(&key)) {
Ok(pos) => Entry::Occupied(OccupiedEntry {
parent: &mut self.secs,
pos,
_marker: PhantomData,
}),
Err(pos) => Entry::Vacant(VacantEntry {
parent: &mut self.secs,
pos,
key,
_marker: PhantomData,
}),
}
}
/// Calculate the bounds of the sector in which `key` is contained.
///
/// ## Edge cases
/// * Wraps around at 2π if the map is not empty.
/// * If only a single element with key `y` is contained in the map, returns `y..y`.
pub fn sector_bounds(&self, mut key: K) -> core::ops::Range<K> {
canonicalize(&mut key);
if self.secs.len() == 0 {
<K as ConstZero>::ZERO..<K as Angle>::TAU
} else {
// `pp`... the first position that is greater than `key`
let pp = self
.secs
.partition_point(|ent| ent.0.total_cmp(&key) != cmp::Ordering::Greater);
(self.secs[pp.wrapping_sub(1).rem_euclid(self.secs.len())].0)..(self.secs[pp].0)
}
}
/// Retain only the elements specified by the predicate.
///
/// In other words, remove all elements e such that f(&e) returns false. This method operates in place.
#[inline]
pub fn retain<F: FnMut(&K, &mut V) -> bool>(&mut self, mut f: F) {
self.secs.retain(move |ent| f(&ent.0, &mut ent.1));
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn simple_usage() {
let mut gs = GearSectors::<f64, u8>::new();
gs.entry(0.1).or_insert(1);
assert_eq!(gs.sector_bounds(0.0), 0.1..0.1);
gs.entry(0.2).or_insert(2);
assert_eq!(gs.secs(), &[(0.1, 1), (0.2, 2),]);
assert_eq!(gs.sector_bounds(0.0), 0.2..0.1);
assert_eq!(gs.sector_bounds(0.1), 0.1..0.2);
assert_eq!(gs.sector_bounds(0.15), 0.1..0.2);
}
}