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use bevy_utils::all_tuples;
use crate::{
schedule::{
condition::{BoxedCondition, Condition},
graph_utils::{Ambiguity, Dependency, DependencyKind, GraphInfo},
set::{InternedSystemSet, IntoSystemSet, SystemSet},
Chain,
},
system::{BoxedSystem, IntoSystem, System},
};
fn new_condition<M>(condition: impl Condition<M>) -> BoxedCondition {
let condition_system = IntoSystem::into_system(condition);
assert!(
condition_system.is_send(),
"Condition `{}` accesses `NonSend` resources. This is not currently supported.",
condition_system.name()
);
Box::new(condition_system)
}
fn ambiguous_with(graph_info: &mut GraphInfo, set: InternedSystemSet) {
match &mut graph_info.ambiguous_with {
detection @ Ambiguity::Check => {
*detection = Ambiguity::IgnoreWithSet(vec![set]);
}
Ambiguity::IgnoreWithSet(ambiguous_with) => {
ambiguous_with.push(set);
}
Ambiguity::IgnoreAll => (),
}
}
impl<Marker, F> IntoSystemConfigs<Marker> for F
where
F: IntoSystem<(), (), Marker>,
{
fn into_configs(self) -> SystemConfigs {
SystemConfigs::new_system(Box::new(IntoSystem::into_system(self)))
}
}
impl IntoSystemConfigs<()> for BoxedSystem<(), ()> {
fn into_configs(self) -> SystemConfigs {
SystemConfigs::new_system(self)
}
}
/// Stores configuration for a single generic node (a system or a system set)
///
/// The configuration includes the node itself, scheduling metadata
/// (hierarchy: in which sets is the node contained,
/// dependencies: before/after which other nodes should this node run)
/// and the run conditions associated with this node.
pub struct NodeConfig<T> {
pub(crate) node: T,
/// Hierarchy and dependency metadata for this node
pub(crate) graph_info: GraphInfo,
pub(crate) conditions: Vec<BoxedCondition>,
}
/// Stores configuration for a single system.
pub type SystemConfig = NodeConfig<BoxedSystem>;
/// A collections of generic [`NodeConfig`]s.
pub enum NodeConfigs<T> {
/// Configuration for a single node.
NodeConfig(NodeConfig<T>),
/// Configuration for a tuple of nested `Configs` instances.
Configs {
/// Configuration for each element of the tuple.
configs: Vec<NodeConfigs<T>>,
/// Run conditions applied to everything in the tuple.
collective_conditions: Vec<BoxedCondition>,
/// See [`Chain`] for usage.
chained: Chain,
},
}
/// A collection of [`SystemConfig`].
pub type SystemConfigs = NodeConfigs<BoxedSystem>;
impl SystemConfigs {
fn new_system(system: BoxedSystem) -> Self {
// include system in its default sets
let sets = system.default_system_sets().into_iter().collect();
Self::NodeConfig(SystemConfig {
node: system,
graph_info: GraphInfo {
hierarchy: sets,
..Default::default()
},
conditions: Vec::new(),
})
}
}
impl<T> NodeConfigs<T> {
/// Adds a new boxed system set to the systems.
pub fn in_set_inner(&mut self, set: InternedSystemSet) {
match self {
Self::NodeConfig(config) => {
config.graph_info.hierarchy.push(set);
}
Self::Configs { configs, .. } => {
for config in configs {
config.in_set_inner(set);
}
}
}
}
fn before_inner(&mut self, set: InternedSystemSet) {
match self {
Self::NodeConfig(config) => {
config
.graph_info
.dependencies
.push(Dependency::new(DependencyKind::Before, set));
}
Self::Configs { configs, .. } => {
for config in configs {
config.before_inner(set);
}
}
}
}
fn after_inner(&mut self, set: InternedSystemSet) {
match self {
Self::NodeConfig(config) => {
config
.graph_info
.dependencies
.push(Dependency::new(DependencyKind::After, set));
}
Self::Configs { configs, .. } => {
for config in configs {
config.after_inner(set);
}
}
}
}
fn before_ignore_deferred_inner(&mut self, set: InternedSystemSet) {
match self {
Self::NodeConfig(config) => {
config
.graph_info
.dependencies
.push(Dependency::new(DependencyKind::BeforeNoSync, set));
}
Self::Configs { configs, .. } => {
for config in configs {
config.before_ignore_deferred_inner(set.intern());
}
}
}
}
fn after_ignore_deferred_inner(&mut self, set: InternedSystemSet) {
match self {
Self::NodeConfig(config) => {
config
.graph_info
.dependencies
.push(Dependency::new(DependencyKind::AfterNoSync, set));
}
Self::Configs { configs, .. } => {
for config in configs {
config.after_ignore_deferred_inner(set.intern());
}
}
}
}
fn distributive_run_if_inner<M>(&mut self, condition: impl Condition<M> + Clone) {
match self {
Self::NodeConfig(config) => {
config.conditions.push(new_condition(condition));
}
Self::Configs { configs, .. } => {
for config in configs {
config.distributive_run_if_inner(condition.clone());
}
}
}
}
fn ambiguous_with_inner(&mut self, set: InternedSystemSet) {
match self {
Self::NodeConfig(config) => {
ambiguous_with(&mut config.graph_info, set);
}
Self::Configs { configs, .. } => {
for config in configs {
config.ambiguous_with_inner(set);
}
}
}
}
fn ambiguous_with_all_inner(&mut self) {
match self {
Self::NodeConfig(config) => {
config.graph_info.ambiguous_with = Ambiguity::IgnoreAll;
}
Self::Configs { configs, .. } => {
for config in configs {
config.ambiguous_with_all_inner();
}
}
}
}
/// Adds a new boxed run condition to the systems.
///
/// This is useful if you have a run condition whose concrete type is unknown.
/// Prefer `run_if` for run conditions whose type is known at compile time.
pub fn run_if_dyn(&mut self, condition: BoxedCondition) {
match self {
Self::NodeConfig(config) => {
config.conditions.push(condition);
}
Self::Configs {
collective_conditions,
..
} => {
collective_conditions.push(condition);
}
}
}
fn chain_inner(mut self) -> Self {
match &mut self {
Self::NodeConfig(_) => { /* no op */ }
Self::Configs { chained, .. } => {
*chained = Chain::Yes;
}
}
self
}
fn chain_ignore_deferred_inner(mut self) -> Self {
match &mut self {
Self::NodeConfig(_) => { /* no op */ }
Self::Configs { chained, .. } => {
*chained = Chain::YesIgnoreDeferred;
}
}
self
}
}
/// Types that can convert into a [`SystemConfigs`].
///
/// This trait is implemented for "systems" (functions whose arguments all implement
/// [`SystemParam`](crate::system::SystemParam)), or tuples thereof.
/// It is a common entry point for system configurations.
///
/// # Examples
///
/// ```
/// # use bevy_ecs::schedule::IntoSystemConfigs;
/// # struct AppMock;
/// # struct Update;
/// # impl AppMock {
/// # pub fn add_systems<M>(
/// # &mut self,
/// # schedule: Update,
/// # systems: impl IntoSystemConfigs<M>,
/// # ) -> &mut Self { self }
/// # }
/// # let mut app = AppMock;
///
/// fn handle_input() {}
///
/// fn update_camera() {}
/// fn update_character() {}
///
/// app.add_systems(
/// Update,
/// (
/// handle_input,
/// (update_camera, update_character).after(handle_input)
/// )
/// );
/// ```
#[diagnostic::on_unimplemented(
message = "`{Self}` does not describe a valid system configuration",
label = "invalid system configuration"
)]
pub trait IntoSystemConfigs<Marker>
where
Self: Sized,
{
/// Convert into a [`SystemConfigs`].
fn into_configs(self) -> SystemConfigs;
/// Add these systems to the provided `set`.
#[track_caller]
fn in_set(self, set: impl SystemSet) -> SystemConfigs {
self.into_configs().in_set(set)
}
/// Runs before all systems in `set`. If `self` has any systems that produce [`Commands`](crate::system::Commands)
/// or other [`Deferred`](crate::system::Deferred) operations, all systems in `set` will see their effect.
///
/// If automatically inserting [`apply_deferred`](crate::schedule::apply_deferred) like
/// this isn't desired, use [`before_ignore_deferred`](Self::before_ignore_deferred) instead.
///
/// Note: The given set is not implicitly added to the schedule when this system set is added.
/// It is safe, but no dependencies will be created.
fn before<M>(self, set: impl IntoSystemSet<M>) -> SystemConfigs {
self.into_configs().before(set)
}
/// Run after all systems in `set`. If `set` has any systems that produce [`Commands`](crate::system::Commands)
/// or other [`Deferred`](crate::system::Deferred) operations, all systems in `self` will see their effect.
///
/// If automatically inserting [`apply_deferred`](crate::schedule::apply_deferred) like
/// this isn't desired, use [`after_ignore_deferred`](Self::after_ignore_deferred) instead.
///
/// Note: The given set is not implicitly added to the schedule when this system set is added.
/// It is safe, but no dependencies will be created.
fn after<M>(self, set: impl IntoSystemSet<M>) -> SystemConfigs {
self.into_configs().after(set)
}
/// Run before all systems in `set`.
///
/// Unlike [`before`](Self::before), this will not cause the systems in
/// `set` to wait for the deferred effects of `self` to be applied.
fn before_ignore_deferred<M>(self, set: impl IntoSystemSet<M>) -> SystemConfigs {
self.into_configs().before_ignore_deferred(set)
}
/// Run after all systems in `set`.
///
/// Unlike [`after`](Self::after), this will not wait for the deferred
/// effects of systems in `set` to be applied.
fn after_ignore_deferred<M>(self, set: impl IntoSystemSet<M>) -> SystemConfigs {
self.into_configs().after_ignore_deferred(set)
}
/// Add a run condition to each contained system.
///
/// Each system will receive its own clone of the [`Condition`] and will only run
/// if the `Condition` is true.
///
/// Each individual condition will be evaluated at most once (per schedule run),
/// right before the corresponding system prepares to run.
///
/// This is equivalent to calling [`run_if`](IntoSystemConfigs::run_if) on each individual
/// system, as shown below:
///
/// ```
/// # use bevy_ecs::prelude::*;
/// # let mut schedule = Schedule::default();
/// # fn a() {}
/// # fn b() {}
/// # fn condition() -> bool { true }
/// schedule.add_systems((a, b).distributive_run_if(condition));
/// schedule.add_systems((a.run_if(condition), b.run_if(condition)));
/// ```
///
/// # Note
///
/// Because the conditions are evaluated separately for each system, there is no guarantee
/// that all evaluations in a single schedule run will yield the same result. If another
/// system is run inbetween two evaluations it could cause the result of the condition to change.
///
/// Use [`run_if`](IntoSystemSetConfigs::run_if) on a [`SystemSet`] if you want to make sure
/// that either all or none of the systems are run, or you don't want to evaluate the run
/// condition for each contained system separately.
fn distributive_run_if<M>(self, condition: impl Condition<M> + Clone) -> SystemConfigs {
self.into_configs().distributive_run_if(condition)
}
/// Run the systems only if the [`Condition`] is `true`.
///
/// The `Condition` will be evaluated at most once (per schedule run),
/// the first time a system in this set prepares to run.
///
/// If this set contains more than one system, calling `run_if` is equivalent to adding each
/// system to a common set and configuring the run condition on that set, as shown below:
///
/// # Examples
///
/// ```
/// # use bevy_ecs::prelude::*;
/// # let mut schedule = Schedule::default();
/// # fn a() {}
/// # fn b() {}
/// # fn condition() -> bool { true }
/// # #[derive(SystemSet, Debug, Eq, PartialEq, Hash, Clone, Copy)]
/// # struct C;
/// schedule.add_systems((a, b).run_if(condition));
/// schedule.add_systems((a, b).in_set(C)).configure_sets(C.run_if(condition));
/// ```
///
/// # Note
///
/// Because the condition will only be evaluated once, there is no guarantee that the condition
/// is upheld after the first system has run. You need to make sure that no other systems that
/// could invalidate the condition are scheduled inbetween the first and last run system.
///
/// Use [`distributive_run_if`](IntoSystemConfigs::distributive_run_if) if you want the
/// condition to be evaluated for each individual system, right before one is run.
fn run_if<M>(self, condition: impl Condition<M>) -> SystemConfigs {
self.into_configs().run_if(condition)
}
/// Suppress warnings and errors that would result from these systems having ambiguities
/// (conflicting access but indeterminate order) with systems in `set`.
fn ambiguous_with<M>(self, set: impl IntoSystemSet<M>) -> SystemConfigs {
self.into_configs().ambiguous_with(set)
}
/// Suppress warnings and errors that would result from these systems having ambiguities
/// (conflicting access but indeterminate order) with any other system.
fn ambiguous_with_all(self) -> SystemConfigs {
self.into_configs().ambiguous_with_all()
}
/// Treat this collection as a sequence of systems.
///
/// Ordering constraints will be applied between the successive elements.
///
/// If the preceding node on a edge has deferred parameters, a [`apply_deferred`](crate::schedule::apply_deferred)
/// will be inserted on the edge. If this behavior is not desired consider using
/// [`chain_ignore_deferred`](Self::chain_ignore_deferred) instead.
fn chain(self) -> SystemConfigs {
self.into_configs().chain()
}
/// Treat this collection as a sequence of systems.
///
/// Ordering constraints will be applied between the successive elements.
///
/// Unlike [`chain`](Self::chain) this will **not** add [`apply_deferred`](crate::schedule::apply_deferred) on the edges.
fn chain_ignore_deferred(self) -> SystemConfigs {
self.into_configs().chain_ignore_deferred()
}
}
impl IntoSystemConfigs<()> for SystemConfigs {
fn into_configs(self) -> Self {
self
}
#[track_caller]
fn in_set(mut self, set: impl SystemSet) -> Self {
assert!(
set.system_type().is_none(),
"adding arbitrary systems to a system type set is not allowed"
);
self.in_set_inner(set.intern());
self
}
fn before<M>(mut self, set: impl IntoSystemSet<M>) -> Self {
let set = set.into_system_set();
self.before_inner(set.intern());
self
}
fn after<M>(mut self, set: impl IntoSystemSet<M>) -> Self {
let set = set.into_system_set();
self.after_inner(set.intern());
self
}
fn before_ignore_deferred<M>(mut self, set: impl IntoSystemSet<M>) -> Self {
let set = set.into_system_set();
self.before_ignore_deferred_inner(set.intern());
self
}
fn after_ignore_deferred<M>(mut self, set: impl IntoSystemSet<M>) -> Self {
let set = set.into_system_set();
self.after_ignore_deferred_inner(set.intern());
self
}
fn distributive_run_if<M>(mut self, condition: impl Condition<M> + Clone) -> SystemConfigs {
self.distributive_run_if_inner(condition);
self
}
fn run_if<M>(mut self, condition: impl Condition<M>) -> SystemConfigs {
self.run_if_dyn(new_condition(condition));
self
}
fn ambiguous_with<M>(mut self, set: impl IntoSystemSet<M>) -> Self {
let set = set.into_system_set();
self.ambiguous_with_inner(set.intern());
self
}
fn ambiguous_with_all(mut self) -> Self {
self.ambiguous_with_all_inner();
self
}
fn chain(self) -> Self {
self.chain_inner()
}
fn chain_ignore_deferred(self) -> Self {
self.chain_ignore_deferred_inner()
}
}
#[doc(hidden)]
pub struct SystemConfigTupleMarker;
macro_rules! impl_system_collection {
($(($param: ident, $sys: ident)),*) => {
impl<$($param, $sys),*> IntoSystemConfigs<(SystemConfigTupleMarker, $($param,)*)> for ($($sys,)*)
where
$($sys: IntoSystemConfigs<$param>),*
{
#[allow(non_snake_case)]
fn into_configs(self) -> SystemConfigs {
let ($($sys,)*) = self;
SystemConfigs::Configs {
configs: vec![$($sys.into_configs(),)*],
collective_conditions: Vec::new(),
chained: Chain::No,
}
}
}
}
}
all_tuples!(impl_system_collection, 1, 20, P, S);
/// A [`SystemSet`] with scheduling metadata.
pub type SystemSetConfig = NodeConfig<InternedSystemSet>;
impl SystemSetConfig {
#[track_caller]
pub(super) fn new(set: InternedSystemSet) -> Self {
// system type sets are automatically populated
// to avoid unintentionally broad changes, they cannot be configured
assert!(
set.system_type().is_none(),
"configuring system type sets is not allowed"
);
Self {
node: set,
graph_info: GraphInfo::default(),
conditions: Vec::new(),
}
}
}
/// A collection of [`SystemSetConfig`].
pub type SystemSetConfigs = NodeConfigs<InternedSystemSet>;
/// Types that can convert into a [`SystemSetConfigs`].
#[diagnostic::on_unimplemented(
message = "`{Self}` does not describe a valid system set configuration",
label = "invalid system set configuration"
)]
pub trait IntoSystemSetConfigs
where
Self: Sized,
{
/// Convert into a [`SystemSetConfigs`].
#[doc(hidden)]
fn into_configs(self) -> SystemSetConfigs;
/// Add these system sets to the provided `set`.
#[track_caller]
fn in_set(self, set: impl SystemSet) -> SystemSetConfigs {
self.into_configs().in_set(set)
}
/// Runs before all systems in `set`. If `self` has any systems that produce [`Commands`](crate::system::Commands)
/// or other [`Deferred`](crate::system::Deferred) operations, all systems in `set` will see their effect.
///
/// If automatically inserting [`apply_deferred`](crate::schedule::apply_deferred) like
/// this isn't desired, use [`before_ignore_deferred`](Self::before_ignore_deferred) instead.
fn before<M>(self, set: impl IntoSystemSet<M>) -> SystemSetConfigs {
self.into_configs().before(set)
}
/// Runs before all systems in `set`. If `set` has any systems that produce [`Commands`](crate::system::Commands)
/// or other [`Deferred`](crate::system::Deferred) operations, all systems in `self` will see their effect.
///
/// If automatically inserting [`apply_deferred`](crate::schedule::apply_deferred) like
/// this isn't desired, use [`after_ignore_deferred`](Self::after_ignore_deferred) instead.
fn after<M>(self, set: impl IntoSystemSet<M>) -> SystemSetConfigs {
self.into_configs().after(set)
}
/// Run before all systems in `set`.
///
/// Unlike [`before`](Self::before), this will not cause the systems in `set` to wait for the
/// deferred effects of `self` to be applied.
fn before_ignore_deferred<M>(self, set: impl IntoSystemSet<M>) -> SystemSetConfigs {
self.into_configs().before_ignore_deferred(set)
}
/// Run after all systems in `set`.
///
/// Unlike [`after`](Self::after), this may not see the deferred
/// effects of systems in `set` to be applied.
fn after_ignore_deferred<M>(self, set: impl IntoSystemSet<M>) -> SystemSetConfigs {
self.into_configs().after_ignore_deferred(set)
}
/// Run the systems in this set(s) only if the [`Condition`] is `true`.
///
/// The `Condition` will be evaluated at most once (per schedule run),
/// the first time a system in this set(s) prepares to run.
fn run_if<M>(self, condition: impl Condition<M>) -> SystemSetConfigs {
self.into_configs().run_if(condition)
}
/// Suppress warnings and errors that would result from systems in these sets having ambiguities
/// (conflicting access but indeterminate order) with systems in `set`.
fn ambiguous_with<M>(self, set: impl IntoSystemSet<M>) -> SystemSetConfigs {
self.into_configs().ambiguous_with(set)
}
/// Suppress warnings and errors that would result from systems in these sets having ambiguities
/// (conflicting access but indeterminate order) with any other system.
fn ambiguous_with_all(self) -> SystemSetConfigs {
self.into_configs().ambiguous_with_all()
}
/// Treat this collection as a sequence of system sets.
///
/// Ordering constraints will be applied between the successive elements.
fn chain(self) -> SystemSetConfigs {
self.into_configs().chain()
}
/// Treat this collection as a sequence of systems.
///
/// Ordering constraints will be applied between the successive elements.
///
/// Unlike [`chain`](Self::chain) this will **not** add [`apply_deferred`](crate::schedule::apply_deferred) on the edges.
fn chain_ignore_deferred(self) -> SystemConfigs {
self.into_configs().chain_ignore_deferred()
}
}
impl IntoSystemSetConfigs for SystemSetConfigs {
fn into_configs(self) -> Self {
self
}
#[track_caller]
fn in_set(mut self, set: impl SystemSet) -> Self {
assert!(
set.system_type().is_none(),
"adding arbitrary systems to a system type set is not allowed"
);
self.in_set_inner(set.intern());
self
}
fn before<M>(mut self, set: impl IntoSystemSet<M>) -> Self {
let set = set.into_system_set();
self.before_inner(set.intern());
self
}
fn after<M>(mut self, set: impl IntoSystemSet<M>) -> Self {
let set = set.into_system_set();
self.after_inner(set.intern());
self
}
fn before_ignore_deferred<M>(mut self, set: impl IntoSystemSet<M>) -> Self {
let set = set.into_system_set();
self.before_ignore_deferred_inner(set.intern());
self
}
fn after_ignore_deferred<M>(mut self, set: impl IntoSystemSet<M>) -> Self {
let set = set.into_system_set();
self.after_ignore_deferred_inner(set.intern());
self
}
fn run_if<M>(mut self, condition: impl Condition<M>) -> SystemSetConfigs {
self.run_if_dyn(new_condition(condition));
self
}
fn ambiguous_with<M>(mut self, set: impl IntoSystemSet<M>) -> Self {
let set = set.into_system_set();
self.ambiguous_with_inner(set.intern());
self
}
fn ambiguous_with_all(mut self) -> Self {
self.ambiguous_with_all_inner();
self
}
fn chain(self) -> Self {
self.chain_inner()
}
}
impl<S: SystemSet> IntoSystemSetConfigs for S {
fn into_configs(self) -> SystemSetConfigs {
SystemSetConfigs::NodeConfig(SystemSetConfig::new(self.intern()))
}
}
impl IntoSystemSetConfigs for SystemSetConfig {
fn into_configs(self) -> SystemSetConfigs {
SystemSetConfigs::NodeConfig(self)
}
}
macro_rules! impl_system_set_collection {
($($set: ident),*) => {
impl<$($set: IntoSystemSetConfigs),*> IntoSystemSetConfigs for ($($set,)*)
{
#[allow(non_snake_case)]
fn into_configs(self) -> SystemSetConfigs {
let ($($set,)*) = self;
SystemSetConfigs::Configs {
configs: vec![$($set.into_configs(),)*],
collective_conditions: Vec::new(),
chained: Chain::No,
}
}
}
}
}
all_tuples!(impl_system_set_collection, 1, 20, S);