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use std::any::type_name;
use std::marker::PhantomData;
use crate::component::{Component, HandleFromEntityComponentRef, Ref as ComponentRef};
use crate::query::{
TermWithField,
TermWithoutField,
TermsBuilder,
TermsBuilderInterface,
};
pub struct With<ComponentT>
where
ComponentT: Component,
{
_pd: PhantomData<ComponentT>,
}
impl<ComponentT> TermWithoutField for With<ComponentT>
where
ComponentT: Component,
{
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
terms_builder: &mut TermsBuilder<MAX_TERM_CNT>,
)
{
terms_builder.with::<ComponentT>();
}
}
pub struct Without<ComponentT>
where
ComponentT: Component,
{
_pd: PhantomData<ComponentT>,
}
impl<ComponentT> TermWithoutField for Without<ComponentT>
where
ComponentT: Component,
{
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
terms_builder: &mut TermsBuilder<MAX_TERM_CNT>,
)
{
terms_builder.without::<ComponentT>();
}
}
impl<ComponentRefT> TermWithField for Option<ComponentRefT>
where
ComponentRefT: ComponentRef,
{
type Field<'a> = Option<ComponentRefT::Handle<'a>>;
fn apply_to_terms_builder<const MAX_TERM_CNT: usize>(
_terms_builder: &mut TermsBuilder<MAX_TERM_CNT>,
)
{
}
fn get_field<'world>(
entity_handle: &crate::entity::Handle<'world>,
world: &'world crate::World,
) -> Self::Field<'world>
{
Some(
ComponentRefT::Handle::<'world>::from_entity_component_ref(
Some(entity_handle.get_component(ComponentRefT::Component::id())?),
world,
)
.unwrap_or_else(|err| {
panic!(
"Creating handle to component {} failed: {err}",
type_name::<ComponentRefT::Component>()
);
}),
)
}
}
|
