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use std::any::Any;
use std::collections::HashSet;
use std::iter::{Filter, Flatten, Map};
use std::marker::PhantomData;
use std::sync::Arc;
use crate::component::storage::{
Archetype,
ArchetypeRefIter,
Storage as ComponentStorage,
};
use crate::component::{
Id as ComponentId,
IsOptional as ComponentIsOptional,
Sequence as ComponentSequence,
};
use crate::lock::{Lock, ReadGuard};
use crate::query::options::Options;
use crate::system::{
NoInitParamFlag as NoInitSystemParamFlag,
Param as SystemParam,
System,
};
use crate::{EntityComponent, World, WorldData};
pub mod options;
#[derive(Debug)]
pub struct Query<'world, Comps, OptionsT = ()>
where
Comps: ComponentSequence,
{
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<'this>(&'this self) -> ComponentIter<'world, Comps>
where
'this: 'world,
{
#[cfg(feature = "debug")]
tracing::debug!("Searching for {}", std::any::type_name::<Comps>());
#[allow(clippy::map_flatten)]
ComponentIter {
entities: self
.component_storage
.find_entities(&Comps::ids())
.map((|archetype| archetype.components.as_slice()) as ComponentIterMapFn)
.flatten()
.filter(|components| OptionsT::entity_filter(*components)),
comps_pd: PhantomData,
}
}
pub(crate) fn new(component_storage: &'world Arc<Lock<ComponentStorage>>) -> Self
{
Self {
component_storage: 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>;
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.data.component_storage)
}
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::ids() })
}
fn handle_pre_run(world_data: &WorldData)
{
let mut component_storage_lock = world_data
.component_storage
.write_nonblock()
.expect("Failed to acquire read-write component storage lock");
#[cfg(feature = "debug")]
tracing::debug!(
"Adding archetypes lookup entry for components: ({})",
std::any::type_name::<Comps>()
);
component_storage_lock.add_archetype_lookup_entry(
&Comps::ids()
.into_iter()
.filter_map(|(component_id, is_optional)| {
if is_optional == ComponentIsOptional::Yes {
return None;
}
Some(component_id)
})
.collect::<Vec<_>>(),
);
}
}
type ComponentIterMapFn = for<'a> fn(&'a Archetype) -> &'a [Vec<EntityComponent>];
type ComponentIterFilterFn = for<'a, 'b> fn(&'a &'b Vec<EntityComponent>) -> bool;
pub struct ComponentIter<'world, Comps>
{
entities: Filter<
Flatten<Map<ArchetypeRefIter<'world>, ComponentIterMapFn>>,
ComponentIterFilterFn,
>,
comps_pd: PhantomData<Comps>,
}
impl<'world, Comps> Iterator for ComponentIter<'world, Comps>
where
Comps: ComponentSequence + 'world,
{
type Item = Comps::Refs<'world>;
fn next(&mut self) -> Option<Self::Item>
{
Some(Comps::from_components(self.entities.next()?.iter()))
}
}
#[derive(Debug)]
struct QueryComponentIds
{
component_ids: Vec<(ComponentId, ComponentIsOptional)>,
}
impl QueryComponentIds
{
fn contains_component_in<OtherComps>(&self) -> bool
where
OtherComps: ComponentSequence,
{
let other_ids = OtherComps::ids()
.into_iter()
.map(|(id, _)| id)
.collect::<HashSet<_>>();
self.component_ids
.iter()
.all(|(id, _)| other_ids.contains(id))
}
}
|
