beet_rsx 0.0.8

An Astro inspired templating system built with bevy
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use beet_core::prelude::*;
use beet_dom::prelude::*;


/// This type may be used to represent:
/// - a constant value `T`
/// - a [`Getter<T>`]
/// - a function that returns `T`, ie a derived signal
#[derive(Clone)]
pub struct DerivedGetter<T: 'static> {
	get_value: CloneFunc<(), T>,
	get_bundle: CloneFunc<(), OnSpawn>,
}

impl<T: 'static> DerivedGetter<T> {
	pub fn new(
		get_value: impl CloneFuncTrait<(), T>,
		get_bundle: impl CloneFuncTrait<(), OnSpawn>,
	) -> Self {
		DerivedGetter {
			get_value: CloneFunc::new(get_value),
			get_bundle: CloneFunc::new(get_bundle),
		}
	}

	/// Get the inner value, either by cloning the const
	/// or calling the func
	pub fn get(&self) -> T { self.get_value.call_func(()) }
}

impl<T, M> IntoBundle<(Self, M)> for DerivedGetter<T>
where
	T: 'static + Send + Sync + IntoBundle<M>,
{
	fn into_bundle(self) -> impl Bundle { self.get_bundle.call_func(()) }
}

impl<T: 'static + Send + Clone + std::fmt::Debug> std::fmt::Debug
	for DerivedGetter<T>
{
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
		write!(f, "DerivedGetter({:?})", self.get())
	}
}

impl<T: 'static + Send + Clone + std::fmt::Display> std::fmt::Display
	for DerivedGetter<T>
{
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
		self.get().fmt(f)
	}
}

pub trait IntoDerivedGetter<T, M> {
	fn into_derived_getter(self) -> DerivedGetter<T>;
}
pub struct IntoIntoDerivedGetterMarker;

impl<T, M, U> IntoDerivedGetter<T, (M, IntoIntoDerivedGetterMarker)> for U
where
	U: Into<T>,
	T: 'static + Send + Sync + Clone + IntoBundle<M>,
{
	fn into_derived_getter(self) -> DerivedGetter<T> {
		let val = self.into();
		let val2 = val.clone();
		DerivedGetter::new(
			move |_| val.clone(),
			move |_| OnSpawn::insert(val2.clone().into_bundle()),
		)
	}
}

pub struct FuncIntoDerivedGetterMarker;
impl<T, M, F> IntoDerivedGetter<T, (M, FuncIntoDerivedGetterMarker)> for F
where
	F: 'static + Send + Sync + Clone + IntoBundle<M> + FnOnce() -> T,
{
	fn into_derived_getter(self) -> DerivedGetter<T> {
		let self2 = self.clone();

		DerivedGetter::new(
			move |_| (self.clone())(),
			move |_| OnSpawn::insert((self2.clone()).into_bundle()),
		)
	}
}
// cant impl fn because multiple impls, derived getter has a special impl
// #[cfg(feature = "nightly")]
// impl<T: 'static + Send + Sync> FnOnce<()> for DerivedGetter<T> {
// 	type Output = T;
// 	extern "rust-call" fn call_once(self, _args: ()) -> Self::Output {
// 		self.value()
// 	}
// }

// #[cfg(feature = "nightly")]
// impl<T: 'static + Send + Sync> FnMut<()> for DerivedGetter<T> {
// 	extern "rust-call" fn call_mut(&mut self, _args: ()) -> Self::Output {
// 		self.value()
// 	}
// }

// #[cfg(feature = "nightly")]
// impl<T: 'static + Send + Sync> Fn<()> for DerivedGetter<T> {
// 	extern "rust-call" fn call(&self, _args: ()) -> Self::Output {
// 		self.value()
// 	}
// }

#[cfg(test)]
mod test {
	use crate::prelude::*;
	use beet_core::prelude::*;

	#[test]
	fn works() {
		let (get, set) = signal("foo");

		let sig: DerivedGetter<&str> = get.into_derived_getter();
		// let sig = get.into_derived_getter();
		sig.get().xpect_eq("foo");
		set("bar");
		sig.get().xpect_eq("bar");
	}
}