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use crate::component::Sequence as ComponentSequence;
use crate::event::component::TypeTransformComponentsToAddedEvents;
use crate::event::{Event, Sequence as EventSequence};
use crate::sole::Sole;
use crate::system::System;
use crate::tuple::Reduce as TupleReduce;
use crate::{SoleAlreadyExistsError, World};
/// A collection of systems, entities & soles that can be added to a [`World`].
pub trait Extension
{
fn collect(self, collector: Collector<'_>);
}
/// Passed to a [`Extension`] to collects it's systems, entities & soles.
pub struct Collector<'world>
{
world: &'world mut World,
}
impl<'world> Collector<'world>
{
/// Returns a new `Collector` for the given [`World`].
pub fn new(world: &'world mut World) -> Self
{
Self { world }
}
/// Adds a system to the [`World`].
pub fn add_system<'this, EventT, SystemImpl>(
&'this mut self,
event: EventT,
system: impl System<'this, SystemImpl>,
) where
EventT: Event,
{
self.world.register_system(event, system);
}
/// Adds a entity to the [`World`].
pub fn add_entity<Comps>(&mut self, components: Comps)
where
Comps: ComponentSequence + TupleReduce<TypeTransformComponentsToAddedEvents>,
Comps::Out: EventSequence,
{
self.world.create_entity(components);
}
/// Adds a globally shared singleton value to the [`World`].
///
/// # Errors
/// Returns `Err` if this [`Sole`] has already been added.
pub fn add_sole<SoleT>(&mut self, sole: SoleT) -> Result<(), SoleAlreadyExistsError>
where
SoleT: Sole,
{
self.world.add_sole(sole)
}
}
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