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|
use std::any::type_name;
use std::marker::PhantomData;
use crate::World;
use crate::component::{
Component,
Handle as ComponentHandle,
HandleMut as ComponentHandleMut,
};
use crate::entity::Handle as EntityHandle;
use crate::query::{
Term,
TermsBuilder,
TermsBuilderInterface,
};
use crate::tuple::Tuple;
use crate::uid::With as WithUid;
pub struct With<WithUidT>
where
WithUidT: WithUid,
{
_pd: PhantomData<WithUidT>,
}
impl<'world, WithUidT> Term<'world> for With<WithUidT>
where
WithUidT: WithUid,
{
type AddField<Fields: Tuple> = Fields;
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
terms_builder: &mut TermsBuilder<MAX_TERM_CNT>,
)
{
terms_builder.present([WithUidT::uid()]);
}
fn add_field<Fields: Tuple>(
_entity_handle: &EntityHandle<'world>,
_world: &'world World,
fields: Fields,
) -> Self::AddField<Fields>
{
fields
}
}
pub struct Without<WithUidT>
where
WithUidT: WithUid,
{
_pd: PhantomData<WithUidT>,
}
impl<'world, WithUidT> Term<'world> for Without<WithUidT>
where
WithUidT: WithUid,
{
type AddField<Fields: Tuple> = Fields;
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
terms_builder: &mut TermsBuilder<MAX_TERM_CNT>,
)
{
terms_builder.absent([WithUidT::uid()]);
}
fn add_field<Fields: Tuple>(
_entity_handle: &EntityHandle<'world>,
_world: &'world World,
fields: Fields,
) -> Self::AddField<Fields>
{
fields
}
}
impl<'world, ComponentT: Component> Term<'world> for Option<&ComponentT>
{
type AddField<Fields: Tuple> =
Fields::WithElementAtEnd<Option<ComponentHandle<'world, ComponentT>>>;
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
_terms_builder: &mut TermsBuilder<MAX_TERM_CNT>,
)
{
}
fn add_field<Fields: Tuple>(
entity_handle: &EntityHandle<'world>,
_world: &'world World,
fields: Fields,
) -> Self::AddField<Fields>
{
let component = (|| {
let comp_ref = &entity_handle
.get_matching_components(ComponentT::id())
.next()?;
match ComponentHandle::<ComponentT>::from_entity_component_ref(comp_ref) {
Ok(component) => Some(component),
Err(err) => {
panic!(
"Creating handle to component {} failed: {err}",
type_name::<ComponentT>()
);
}
}
})();
fields.with_elem(component)
}
}
impl<'world, ComponentT: Component> Term<'world> for Option<&mut ComponentT>
{
type AddField<Fields: Tuple> =
Fields::WithElementAtEnd<Option<ComponentHandleMut<'world, ComponentT>>>;
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
_terms_builder: &mut TermsBuilder<MAX_TERM_CNT>,
)
{
}
fn add_field<Fields: Tuple>(
entity_handle: &EntityHandle<'world>,
world: &'world World,
fields: Fields,
) -> Self::AddField<Fields>
{
let component = (|| {
let comp_ref = &entity_handle
.get_matching_components(ComponentT::id())
.next()?;
match ComponentHandleMut::<ComponentT>::from_entity_component_ref(comp_ref, world) {
Ok(component) => Some(component),
Err(err) => {
panic!(
"Creating mut handle to component {} failed: {err}",
type_name::<ComponentT>()
);
}
}
})();
fields.with_elem(component)
}
}
|
