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|
use std::any::{type_name, Any, TypeId};
use std::fmt::Debug;
use seq_macro::seq;
use crate::lock::WriteGuard;
use crate::system::{ComponentRefMut, Input as SystemInput};
use crate::type_name::TypeName;
use crate::EntityComponent;
pub mod local;
pub trait Component: SystemInput + Any + TypeName
{
/// The component type in question. Will usually be `Self`
type Component
where
Self: Sized;
type RefMut<'component>
where
Self: Sized;
#[doc(hidden)]
fn as_any_mut(&mut self) -> &mut dyn Any;
#[doc(hidden)]
fn as_any(&self) -> &dyn Any;
}
impl dyn Component
{
pub fn downcast_mut<Real: 'static>(&mut self) -> Option<&mut Real>
{
self.as_any_mut().downcast_mut()
}
pub fn downcast_ref<Real: 'static>(&self) -> Option<&Real>
{
self.as_any().downcast_ref()
}
pub fn is<Other: 'static>(&self) -> bool
{
self.as_any().is::<Other>()
}
}
impl Debug for dyn Component
{
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
{
formatter.debug_struct("Component").finish_non_exhaustive()
}
}
impl TypeName for Box<dyn Component>
{
fn type_name(&self) -> &'static str
{
self.as_ref().type_name()
}
}
impl<ComponentT> Component for Option<ComponentT>
where
ComponentT: Component,
{
type Component = ComponentT;
type RefMut<'component> = Option<ComponentRefMut<'component, ComponentT>>;
fn as_any_mut(&mut self) -> &mut dyn Any
{
self
}
fn as_any(&self) -> &dyn Any
{
self
}
}
impl<ComponentT> TypeName for Option<ComponentT>
where
ComponentT: Component,
{
fn type_name(&self) -> &'static str
{
type_name::<Self>()
}
}
impl<ComponentT> SystemInput for Option<ComponentT> where ComponentT: Component {}
/// A sequence of components.
pub trait Sequence
{
type Refs<'component>
where
Self: 'component;
fn into_vec(self) -> Vec<Box<dyn Component>>;
fn type_ids() -> Vec<(TypeId, IsOptional)>;
fn from_components<'component>(
components: impl Iterator<Item = &'component EntityComponent>,
) -> Self::Refs<'component>;
}
/// Whether or not a `Component` is optional.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum IsOptional
{
Yes,
No,
}
impl From<bool> for IsOptional
{
fn from(is_optional: bool) -> Self
{
if is_optional {
return IsOptional::Yes;
}
IsOptional::No
}
}
/// Returns whether the given component type is a optional component.
///
/// Will return `true` if the component is a [`Option`].
pub fn is_optional<ComponentT: Component>() -> bool
{
if TypeId::of::<ComponentT>() == TypeId::of::<Option<ComponentT::Component>>() {
return true;
}
false
}
pub trait FromOptionalComponent<'comp>
{
fn from_optional_component(
optional_component: Option<WriteGuard<'comp, Box<dyn Component>>>,
) -> Self;
}
macro_rules! inner {
($c: tt) => {
seq!(I in 0..=$c {
impl<#(Comp~I: Component,)*> Sequence for (#(Comp~I,)*)
where
#(for<'comp> Comp~I::RefMut<'comp>: FromOptionalComponent<'comp>,)*
{
type Refs<'component> = (#(Comp~I::RefMut<'component>,)*)
where Self: 'component;
fn into_vec(self) -> Vec<Box<dyn Component>>
{
Vec::from_iter([#(Box::new(self.I) as Box<dyn Component>,)*])
}
fn type_ids() -> Vec<(TypeId, IsOptional)>
{
vec![
#(
(TypeId::of::<Comp~I>(), is_optional::<Comp~I>().into()),
)*
]
}
fn from_components<'component>(
components: impl Iterator<Item = &'component EntityComponent>,
) -> Self::Refs<'component>
{
#(
let mut comp_~I: Option<WriteGuard<Box<dyn Component>>> = None;
)*
for comp in components {
#(
if comp.id == TypeId::of::<Comp~I::Component>() {
comp_~I = Some(lock_component(comp));
continue;
}
)*
}
(#(
Comp~I::RefMut::from_optional_component(comp_~I),
)*)
}
}
});
};
}
seq!(C in 0..=64 {
inner!(C);
});
fn lock_component(
entity_component: &EntityComponent,
) -> WriteGuard<'_, Box<dyn Component>>
{
entity_component
.component
.write_nonblock()
.unwrap_or_else(|_| {
panic!(
"Failed to acquire read-write lock to component {}",
entity_component.name
);
})
}
|
