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use std::marker::PhantomData;
use crate::component::RefSequence as ComponentRefSequence;
use crate::query::flexible::{
EntityHandle,
Iter as FlexibleQueryIter,
Query as FlexibleQuery,
};
use crate::query::options::Options;
use crate::system::{Param as SystemParam, System};
use crate::uid::Uid;
use crate::World;
pub mod flexible;
pub mod options;
#[derive(Debug)]
pub struct Query<'world, Comps, OptionsT = ()>
where
Comps: ComponentRefSequence,
{
world: &'world World,
inner: FlexibleQuery<'world, Comps::Metadata>,
_pd: PhantomData<(Comps, OptionsT)>,
}
impl<'world, Comps, OptionsT> Query<'world, Comps, OptionsT>
where
Comps: ComponentRefSequence,
OptionsT: Options,
{
/// Iterates over the entities matching this query, the iterator item being the entity
/// components.
#[must_use]
pub fn iter<'query>(
&'query self,
) -> ComponentIter<'query, 'world, Comps, FlexibleQueryIter<'query>>
{
#[cfg(feature = "debug")]
tracing::debug!("Searching for {}", std::any::type_name::<Comps>());
ComponentIter {
world: self.world,
iter: self.inner.iter::<OptionsT>(),
comps_pd: PhantomData,
}
}
/// Iterates over the entities matching this query, the iterator item being the entity
/// [`Uid`] and the entity components.
#[must_use]
pub fn iter_with_euids<'query>(
&'query self,
) -> ComponentAndEuidIter<'query, 'world, Comps, FlexibleQueryIter<'query>>
{
#[cfg(feature = "debug")]
tracing::debug!("Searching for {}", std::any::type_name::<Comps>());
ComponentAndEuidIter {
world: self.world,
iter: self.inner.iter::<OptionsT>(),
comps_pd: PhantomData,
}
}
/// Iterates over the entities matching this query using the iterator returned by
/// `func`.
///
/// This function exists so that a custom [`EntityHandle`] iterator can be given to
/// [`ComponentIter`] without giving the user access to a reference to the [`World`].
#[must_use]
pub fn iter_with<'query, OutIter>(
&'query self,
func: impl FnOnce(FlexibleQueryIter<'query>) -> OutIter,
) -> ComponentIter<'query, 'world, Comps, OutIter>
where
OutIter: Iterator<Item = EntityHandle<'query>>,
{
#[cfg(feature = "debug")]
tracing::debug!("Searching for {}", std::any::type_name::<Comps>());
ComponentIter {
world: self.world,
iter: func(self.inner.iter::<OptionsT>()),
comps_pd: PhantomData,
}
}
/// Returns the UID of the entity at the given query iteration index.
#[must_use]
pub fn get_entity_uid(&self, entity_index: usize) -> Option<Uid>
{
Some(self.inner.iter::<OptionsT>().nth(entity_index)?.uid())
}
pub(crate) fn new(world: &'world World) -> Self
{
Self {
world,
inner: world.flexible_query(Comps::metadata()),
_pd: PhantomData,
}
}
}
impl<'query, 'world, Comps, OptionsT> IntoIterator
for &'query Query<'world, Comps, OptionsT>
where
Comps: ComponentRefSequence + 'world,
OptionsT: Options,
{
type IntoIter = ComponentIter<'query, 'world, Comps, FlexibleQueryIter<'query>>;
type Item = Comps::Handles<'query>;
fn into_iter(self) -> Self::IntoIter
{
self.iter()
}
}
impl<'world, Comps, OptionsT> SystemParam<'world> for Query<'world, Comps, OptionsT>
where
Comps: ComponentRefSequence,
OptionsT: Options,
{
type Input = ();
fn initialize<SystemImpl>(
_system: &mut impl System<'world, SystemImpl>,
_input: Self::Input,
)
{
}
fn new<SystemImpl>(
_system: &'world impl System<'world, SystemImpl>,
world: &'world World,
) -> Self
{
Self::new(world)
}
}
pub struct ComponentIter<'query, 'world, Comps, EntityHandleIter>
where
EntityHandleIter: Iterator<Item = EntityHandle<'query>>,
{
world: &'world World,
iter: EntityHandleIter,
comps_pd: PhantomData<Comps>,
}
impl<'query, 'world, Comps, EntityHandleIter>
ComponentIter<'query, 'world, Comps, EntityHandleIter>
where
Comps: ComponentRefSequence + 'world,
EntityHandleIter: Iterator<Item = EntityHandle<'query>>,
'world: 'query,
{
pub(crate) fn new(world: &'world World, iter: EntityHandleIter) -> Self
{
Self { world, iter, comps_pd: PhantomData }
}
}
impl<'query, 'world, Comps, EntityHandleIter> Iterator
for ComponentIter<'query, 'world, Comps, EntityHandleIter>
where
Comps: ComponentRefSequence + 'world,
EntityHandleIter: Iterator<Item = EntityHandle<'query>>,
'world: 'query,
{
type Item = Comps::Handles<'query>;
fn next(&mut self) -> Option<Self::Item>
{
let entity_handle = self.iter.next()?;
Some(Comps::from_components(
entity_handle.components(),
|component_uid| entity_handle.get_component_index(component_uid),
self.world,
))
}
}
pub struct ComponentAndEuidIter<'query, 'world, Comps, EntityHandleIter>
where
EntityHandleIter: Iterator<Item = EntityHandle<'query>>,
{
world: &'world World,
iter: EntityHandleIter,
comps_pd: PhantomData<Comps>,
}
impl<'query, 'world, Comps, EntityHandleIter> Iterator
for ComponentAndEuidIter<'query, 'world, Comps, EntityHandleIter>
where
Comps: ComponentRefSequence + 'world,
EntityHandleIter: Iterator<Item = EntityHandle<'query>>,
'world: 'query,
{
type Item = (Uid, Comps::Handles<'query>);
fn next(&mut self) -> Option<Self::Item>
{
let entity_handle = self.iter.next()?;
Some((
entity_handle.uid(),
Comps::from_components(
entity_handle.components(),
|component_uid| entity_handle.get_component_index(component_uid),
self.world,
),
))
}
}
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