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use crate::*;
pub struct System {
pub(crate) initialize: Box<dyn Fn(&mut World) + Send>,
pub(crate) lock:
Box<dyn Fn(*const World, *mut Vec<Box<dyn RefLifetime>>) -> SystemResult + Send>,
pub(crate) run_fn: Box<dyn FnMut(&World) -> SystemResult + Send>,
}
impl System {
pub fn initialize(&self, world: &mut World) {
(self.initialize)(world)
}
pub fn run(&mut self, world: &World) -> SystemResult {
(self.run_fn)(world)
}
}
pub trait IntoSystem<R> {
fn system(self) -> System;
}
macro_rules! impl_system {
($($id:ident,)* $(&mut $idmut:ident,)*) => {
impl<$($id: Send + Sync,)* $($idmut: Send + Sync,)* F> IntoSystem<($(&$id,)* $(&mut $idmut,)*)> for F
where
$($id: Default+'static,)*
$($idmut: Default+'static,)*
F: Fn($(&$id,)* $(&mut $idmut,)*) -> SystemResult + 'static + Send,
{
fn system(self) -> System {
System {
initialize: Box::new(|_world: &mut World| {
$(_world.initialize::<$id>();)*
$(_world.initialize::<$idmut>();)*
}),
lock: Box::new(|_world: *const World, _locked: *mut Vec<Box<dyn RefLifetime>>| {
$(unsafe {(&mut *_locked).push(Box::new((*_world).get::<$id>()?))};)*
$(unsafe {(&mut *_locked).push(Box::new((*_world).get_mut::<$idmut>()?))};)*
Ok(())
}),
run_fn: Box::new(move |_world: &World| {
self($(&*_world.get::<$id>()?,)* $(&mut *_world.get_mut::<$idmut>()?),*)
}),
}
}
}
}
}
macro_rules! impl_system_muts {
($($processed:ident),*$(,)?;) => {
impl_system!($(&mut $processed,)*);
};
($($processed:ident),*$(,)?; $head:ident, $($tail:ident,)*) => {
impl_system!($($tail,)* $head, $(&mut $processed,)*);
impl_system_muts!($($processed,)* $head; $($tail,)*);
}
}
macro_rules! impl_systems {
() => {};
($head:ident, $($idents:ident,)*) => {
impl_system_muts!(; $head, $($idents,)*);
impl_systems!($($idents,)*);
}
}
impl_system!();
#[cfg(not(feature="big_systems"))]
impl_systems!(A, B, C, D, E, G, H, I, J, K, L, M,);
#[cfg(feature="big_systems")]
impl_systems!(A, B, C, D, E, G, H, I, J, K, L, M, O, P, Q, R, S, T, U, V, W,);
#[cfg(test)]
mod tests {
use crate::*;
use wasm_bindgen_test::*;
#[test]
#[wasm_bindgen_test]
fn convert_system() {
let _ = generic::<u32>.system();
fn tmp(_var1: &u32, _var2: &u64, _var3: &mut i32, _var4: &mut i64) -> SystemResult {
Ok(())
}
fn tmp2(
_var1: &u32,
_var2: &u64,
_var3: &mut i32,
_var4: &mut i64,
_var5: &mut i64,
_var6: &mut i64,
_var7: &mut i64,
_var8: &mut i64,
_var9: &mut i64,
_var10: &mut i64,
_var11: &mut i64,
_var12: &mut i64,
) -> SystemResult {
Ok(())
}
let _ = tmp.system();
let _ = tmp2.system();
}
#[test]
#[wasm_bindgen_test]
fn system_is_send() {
let x = 6;
send(
(move |_var1: &u32| {
let _y = x;
Ok(())
})
.system(),
);
send((|| Ok(())).system());
send(sys.system());
}
fn sys(_var1: &u32) -> SystemResult {
Ok(())
}
fn generic<T>(_t: &T) -> SystemResult {
Ok(())
}
fn send<T: Send>(_t: T) {}
#[test]
#[wasm_bindgen_test]
fn manual_system_run() {
let mut world = World::default();
world.initialize::<u32>();
generic::<u32>.system().run(&world).unwrap();
}
#[test]
#[wasm_bindgen_test]
fn system_replace_resource() {
#[derive(Default)]
pub struct A;
#[derive(Default)]
pub struct B {
x: u32,
}
let mut world = World::default();
let mut my_system = (|_a: &A, b: &mut B| {
let b2 = B { x: 45 };
*b = b2;
Ok(())
})
.system();
my_system.initialize(&mut world);
my_system.run(&world).unwrap();
assert_eq!(world.get::<B>().unwrap().x, 45);
}
}