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use std::convert::Infallible;
use crate::component::storage::Storage as ComponentStorage;
use crate::component::{IntoParts as IntoComponentParts, Parts as ComponentParts};
use crate::entity::{
Handle as EntityHandle,
MatchingComponentIter as EntityMatchingComponentIter,
};
use crate::lock::ReadGuard;
use crate::query::{
TermWithField as QueryTermWithField,
TermsBuilder as QueryTermsBuilder,
TermsBuilderInterface,
};
use crate::uid::{PairParams as UidPairParams, Uid, Wildcard, With as WithUid};
use crate::{Component, World};
#[derive(Debug)]
pub struct Pair<RelationElem: Element, TargetElem: Element>
{
relation: RelationElem,
target: TargetElem,
}
impl Pair<Uid, Uid>
{
pub fn new<Relation: WithUid>(target: Uid) -> Self
{
Self { relation: Relation::uid(), target }
}
pub fn id(&self) -> Uid
{
Uid::new_pair(UidPairParams {
relation: self.relation,
target: self.target,
})
}
}
impl IntoComponentParts for Pair<Uid, Uid>
{
fn into_parts(self) -> ComponentParts
{
ComponentParts::builder().name("Pair").build(self.id(), ())
}
}
impl<Relation, Target> QueryTermWithField for Pair<Relation, Target>
where
Relation: WithUid,
Target: WithUid,
{
type Field<'a> = Handle<'a>;
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
terms_builder: &mut QueryTermsBuilder<MAX_TERM_CNT>,
)
{
terms_builder.with_required([Self::uid()]);
}
fn get_field<'world>(
entity_handle: &EntityHandle<'world>,
world: &'world World,
) -> Self::Field<'world>
{
let first_matching_comp = entity_handle
.get_matching_components(Self::uid())
.next()
.expect("Not possible");
Handle {
world,
component_storage_lock: world.data.component_storage.read_nonblock().unwrap(),
pair_uid: first_matching_comp.id(),
}
}
}
impl<Relation, Target> WithUid for Pair<Relation, Target>
where
Relation: WithUid,
Target: WithUid,
{
fn uid() -> Uid
{
Uid::new_pair(UidPairParams {
relation: Relation::uid(),
target: Target::uid(),
})
}
}
impl<Relation> QueryTermWithField for &'static [Pair<Relation, Wildcard>]
where
Relation: WithUid,
{
type Field<'a> = HandleIter<'a>;
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
terms_builder: &mut QueryTermsBuilder<MAX_TERM_CNT>,
)
{
terms_builder.with_required([Pair::<Relation, Wildcard>::uid()]);
}
fn get_field<'world>(
entity_handle: &EntityHandle<'world>,
world: &'world World,
) -> Self::Field<'world>
{
HandleIter {
inner: entity_handle
.get_matching_components(Pair::<Relation, Wildcard>::uid()),
world,
}
}
}
pub struct Handle<'world>
{
world: &'world World,
component_storage_lock: ReadGuard<'world, ComponentStorage>,
pair_uid: Uid,
}
impl Handle<'_>
{
pub fn get_target_entity(&self) -> Option<EntityHandle<'_>>
{
let archetype = self
.component_storage_lock
.get_entity_archetype(self.pair_uid.target_entity())?;
let archetype_entity = archetype
.get_entity_by_id(self.pair_uid.target_entity())
.expect("Not possible");
Some(EntityHandle::new(self.world, archetype, archetype_entity))
}
}
pub struct HandleIter<'a>
{
inner: EntityMatchingComponentIter<'a>,
world: &'a World,
}
impl<'a> Iterator for HandleIter<'a>
{
type Item = Handle<'a>;
fn next(&mut self) -> Option<Self::Item>
{
let matching_comp = self.inner.next()?;
Some(Handle {
world: self.world,
component_storage_lock: self
.world
.data
.component_storage
.read_nonblock()
.unwrap(),
pair_uid: matching_comp.id(),
})
}
}
pub trait Element: sealed::Sealed
{
type Value;
}
impl Element for Uid
{
type Value = Uid;
}
impl sealed::Sealed for Uid {}
impl<WithUidT: WithUid> Element for WithUidT
{
type Value = Infallible;
}
impl<WithUidT: WithUid> sealed::Sealed for WithUidT {}
/// Relation denoting a dependency to another entity
#[derive(Debug, Default, Clone, Copy, Component)]
pub struct DependsOn;
/// Relation denoting being the child of another entity.
#[derive(Debug, Default, Clone, Copy, Component)]
pub struct ChildOf;
mod sealed
{
pub trait Sealed {}
}
|
