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|
use ecs::util::VecExt;
#[derive(Debug)]
pub struct MapVec<Key: Ord, Value>
{
inner: Vec<(Key, Value)>,
}
impl<Key: Ord, Value> MapVec<Key, Value>
{
pub fn insert(&mut self, key: Key, value: Value)
{
self.inner
.insert_at_part_pt_by_key((key, value), |(a_key, _)| a_key);
}
pub fn remove(&mut self, key: Key) -> Option<Value>
{
let index = self
.inner
.binary_search_by_key(&&key, |(a_key, _)| a_key)
.ok()?;
let (_, value) = self.inner.remove(index);
Some(value)
}
pub fn get(&self, key: &Key) -> Option<&Value>
{
let index = self
.inner
.binary_search_by_key(&key, |(a_key, _)| a_key)
.ok()?;
let Some((_, value)) = self.inner.get(index) else {
unreachable!(); // Reason: Index from binary search cannot be OOB
};
Some(value)
}
pub fn get_mut(&mut self, key: &Key) -> Option<&mut Value>
{
let index = self
.inner
.binary_search_by_key(&key, |(a_key, _)| a_key)
.ok()?;
let Some((_, value)) = self.inner.get_mut(index) else {
unreachable!(); // Reason: Index from binary search cannot be OOB
};
Some(value)
}
pub fn values(&self) -> impl Iterator<Item = &Value>
{
self.inner.iter().map(|(_, value)| value)
}
}
impl<Key: Ord, Value> Default for MapVec<Key, Value>
{
fn default() -> Self
{
Self { inner: Vec::new() }
}
}
pub trait OptionExt<T>
{
/// Substitute for the currently experimental function
/// [`Option::get_or_try_insert_with`].
/// See https://github.com/rust-lang/rust/issues/143648
fn get_or_try_insert_with_fn<Err>(
&mut self,
func: impl Fn() -> Result<T, Err>,
) -> Result<&mut T, Err>;
}
impl<T> OptionExt<T> for Option<T>
{
fn get_or_try_insert_with_fn<Err>(
&mut self,
func: impl FnOnce() -> Result<T, Err>,
) -> Result<&mut T, Err>
{
if let None = self {
*self = Some(func()?);
}
Ok(unsafe { self.as_mut().unwrap_unchecked() })
}
}
macro_rules! try_option {
($expr: expr) => {
match $expr {
Ok(value) => value,
Err(err) => {
return Some(Err(err.into()));
}
}
};
}
pub(crate) use try_option;
macro_rules! or {
(($($tt: tt)+) else ($($else_tt: tt)*)) => {
$($tt)+
};
(() else ($($else_tt: tt)*)) => {
$($else_tt)*
};
}
pub(crate) use or;
#[macro_export]
macro_rules! expand_map_opt {
($in: tt, no_occurance=($($no_occurance: tt)*), occurance=($($occurance: tt)*)) => {
$($occurance)*
};
(, no_occurance=($($no_occurance: tt)*), occurance=($($occurance: tt)*)) => {
$($no_occurance)*
};
}
#[macro_export]
macro_rules! builder {
(
$(#[doc = $doc: literal])*
#[builder(
name = $builder_name: ident
$(, derives = ($($builder_derive: ident),+))?
)]
$(#[$attr: meta])*
$visibility: vis struct $name: ident
{
$(
$(#[doc = $field_doc: literal])*
$(#[builder(skip_generate_fn$($field_skip_generate_fn: tt)?)])?
$field_visibility: vis $field: ident: $field_type: ty,
)*
}
) => {
$(#[doc = $doc])*
$(#[$attr])*
$visibility struct $name
{
$(
$(#[doc = $field_doc])*
$field_visibility $field: $field_type,
)*
}
$(#[derive($($builder_derive),+)])?
$visibility struct $builder_name
{
$(
$field: $field_type,
)*
}
impl $builder_name
{
$(
$crate::expand_map_opt!(
$(true $($field_skip_generate_fn)?)?,
no_occurance=(
#[must_use]
$visibility fn $field(mut self, $field: $field_type) -> Self
{
self.$field = $field;
self
}
),
occurance=()
);
)*
#[must_use]
$visibility const fn build(self) -> $name
{
$name {
$(
$field: self.$field,
)*
}
}
}
impl From<$name> for $builder_name
{
#[allow(unused_variables)]
fn from(built: $name) -> Self
{
Self {
$(
$field: built.$field,
)*
}
}
}
};
}
|
