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use super::{
archetype::{ArchetypeIndex, EntityLayout},
component::ComponentTypeId,
slicevec::SliceVec,
};
use crate::internals::query::filter::LayoutFilter;
#[derive(Default, Debug)]
pub struct SearchIndex {
component_layouts: SliceVec<ComponentTypeId>,
}
impl SearchIndex {
pub(crate) fn push(&mut self, archetype_layout: &EntityLayout) {
self.component_layouts
.push(archetype_layout.component_types().iter().copied());
}
pub fn search_from<'a, F: LayoutFilter>(
&'a self,
filter: &'a F,
start: usize,
) -> impl Iterator<Item = ArchetypeIndex> + 'a {
self.component_layouts
.iter_from(start)
.enumerate()
.filter(move |(_, components)| filter.matches_layout(components).is_pass())
.map(move |(i, _)| ArchetypeIndex((i + start) as u32))
}
pub fn search<'a, F: LayoutFilter>(
&'a self,
filter: &'a F,
) -> impl Iterator<Item = ArchetypeIndex> + 'a {
self.search_from(filter, 0)
}
}