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use std::any::Any;
use std::collections::HashSet;
use std::iter::{Filter, Flatten, Map};
use std::marker::PhantomData;
use crate::component::storage::{
Archetype,
ArchetypeEntity,
ArchetypeRefIter,
EntityIter,
Storage as ComponentStorage,
};
use crate::component::{Metadata as ComponentMetadata, Sequence as ComponentSequence};
use crate::entity::Uid as EntityUid;
use crate::lock::ReadGuard;
use crate::query::options::Options;
use crate::system::{
NoInitParamFlag as NoInitSystemParamFlag,
Param as SystemParam,
System,
};
use crate::World;
pub mod options;
#[derive(Debug)]
pub struct Query<'world, Comps, OptionsT = ()>
where
Comps: ComponentSequence,
{
world: &'world World,
component_storage: ReadGuard<'world, ComponentStorage>,
_pd: PhantomData<(Comps, OptionsT)>,
}
impl<'world, Comps, OptionsT> Query<'world, Comps, OptionsT>
where
Comps: ComponentSequence,
OptionsT: Options,
{
/// Iterates over the entities matching this query.
#[must_use]
pub fn iter(&'world self) -> ComponentIter<'world, Comps, QueryEntityIter<'world>>
{
#[cfg(feature = "debug")]
tracing::debug!("Searching for {}", std::any::type_name::<Comps>());
#[allow(clippy::map_flatten)]
ComponentIter {
world: self.world,
entities: self
.component_storage
.find_entities(Comps::metadata())
.map(Archetype::entities as ComponentIterMapFn)
.flatten()
.filter(|entity| OptionsT::entity_filter(entity.components())),
comps_pd: PhantomData,
}
}
/// Returns the UID of the entity at the given query iteration index.
#[must_use]
pub fn entity_uid(&self, entity_index: usize) -> Option<EntityUid>
{
Some(
self.component_storage
.find_entities(Comps::metadata())
.flat_map(|archetype| archetype.entities())
.filter(|entity| OptionsT::entity_filter(entity.components()))
.nth(entity_index)?
.uid(),
)
}
pub(crate) fn new(world: &'world World) -> Self
{
Self {
world,
component_storage: world
.data
.component_storage
.read_nonblock()
.expect("Failed to acquire read-only component storage lock"),
_pd: PhantomData,
}
}
}
impl<'world, Comps, OptionsT> IntoIterator for &'world Query<'world, Comps, OptionsT>
where
Comps: ComponentSequence,
OptionsT: Options,
{
type IntoIter = ComponentIter<'world, Comps, QueryEntityIter<'world>>;
type Item = Comps::Refs<'world>;
fn into_iter(self) -> Self::IntoIter
{
self.iter()
}
}
unsafe impl<'world, Comps, OptionsT> SystemParam<'world>
for Query<'world, Comps, OptionsT>
where
Comps: ComponentSequence,
OptionsT: Options,
{
type Flags = NoInitSystemParamFlag;
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)
}
fn is_compatible<Other: SystemParam<'world>>() -> bool
{
let other_comparable = Other::get_comparable();
let Some(other_query_component_ids) =
other_comparable.downcast_ref::<QueryComponentIds>()
else {
return true;
};
!other_query_component_ids.contains_component_in::<Comps>()
}
fn get_comparable() -> Box<dyn Any>
{
Box::new(QueryComponentIds { component_ids: Comps::metadata() })
}
}
type ComponentIterMapFn = for<'a> fn(&'a Archetype) -> EntityIter<'a>;
type ComponentIterFilterFn = for<'a, 'b> fn(&'a &'b ArchetypeEntity) -> bool;
type QueryEntityIter<'world> = Filter<
Flatten<Map<ArchetypeRefIter<'world>, ComponentIterMapFn>>,
ComponentIterFilterFn,
>;
pub struct ComponentIter<'world, Comps, EntityIter>
where
EntityIter: Iterator<Item = &'world ArchetypeEntity>,
{
world: &'world World,
entities: EntityIter,
comps_pd: PhantomData<Comps>,
}
impl<'world, Comps, EntityIter> Iterator for ComponentIter<'world, Comps, EntityIter>
where
Comps: ComponentSequence + 'world,
EntityIter: Iterator<Item = &'world ArchetypeEntity>,
{
type Item = Comps::Refs<'world>;
fn next(&mut self) -> Option<Self::Item>
{
Some(Comps::from_components(
self.entities.next()?.components().iter(),
self.world,
))
}
}
#[derive(Debug)]
struct QueryComponentIds
{
component_ids: Vec<ComponentMetadata>,
}
impl QueryComponentIds
{
fn contains_component_in<OtherComps>(&self) -> bool
where
OtherComps: ComponentSequence,
{
let other_ids = OtherComps::metadata()
.into_iter()
.map(|component_metadata| component_metadata.id)
.collect::<HashSet<_>>();
self.component_ids
.iter()
.all(|component_metadata| other_ids.contains(&component_metadata.id))
}
}
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