From 4632dd8e9e95a377993ef677a157202fda8072f9 Mon Sep 17 00:00:00 2001
From: Dominik Kaiser
Date: Tue, 2 Jun 2026 23:23:57 +0200
Subject: Implement ECS

---
 src/lib.rs | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 src/lib.rs

(limited to 'src/lib.rs')

diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..be4c2bf
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,110 @@
+pub mod bundle;
+pub mod component;
+pub mod query;
+pub mod sparse_set;
+
+pub mod prelude {
+    pub use super::component::Component;
+    pub use super::component::ComponentStorage;
+    pub use super::sparse_set::SparseSet;
+    pub use super::Entity;
+    pub use super::bundle::ComponentBundle;
+    pub use super::query::Query;
+    pub use super::query::QueryMut;
+}
+
+pub type Entity = usize;
+
+#[macro_export]
+macro_rules! ecs {
+    ($name:ident {
+        context: $ctx:ty,
+        components: {
+            $($comp:ident),* $(,)?
+        },
+        systems: {
+            $($sys:path),* $(,)?
+        }$(,)?
+    }) => {
+        #[allow(non_snake_case)]
+        struct $name {
+            next_entity: Entity,
+            $($comp: SparseSet<$comp>),*
+        }
+
+        impl $name {
+            pub fn new() -> Self {
+                Self {
+                    next_entity: 0,
+                    $($comp: SparseSet::new()),*
+                }
+            }
+
+            pub fn update(&mut self, ctx: &mut $ctx) {
+                $($sys(self, ctx));*
+            }
+
+            pub fn insert<T: ComponentBundle<Self>>(&mut self, entity: Entity, bundle: T) {
+                bundle.insert(self, entity);
+            }
+
+            pub fn spawn<T: ComponentBundle<Self>>(&mut self, bundle:T) -> Entity {
+                let e = self.next_entity;
+                self.next_entity += 1;
+                bundle.insert(self, e);
+                e
+            }
+
+            pub fn remove<T: Component>(&mut self, entity: Entity)
+            where
+                Self: ComponentStorage<T>,
+            {
+                self.storage_mut().remove(entity);
+            }
+
+            pub fn delete(&mut self, entity: Entity) {
+                $(self.$comp.remove(entity);)*
+            }
+
+            pub fn get<T: Component>(&self, entity: Entity) -> Option<&T>
+            where
+                Self: ComponentStorage<T>,
+            {
+                self.storage().get(entity)
+            }
+
+            pub fn get_mut<T: Component>(&mut self, entity: Entity) -> Option<&mut T>
+            where
+                Self: ComponentStorage<T>,
+            {
+                self.storage_mut().get_mut(entity)
+            }
+
+        }
+
+        impl<'a> $name {
+            pub fn query<Q: Query<'a, Self>>(&'a self) -> impl Iterator<Item = Q::Item> {
+                Q::run(self)
+            }
+
+            pub fn query_mut<Q: QueryMut<'a, Self>>(&'a mut self)
+                                                    -> impl Iterator<Item = Q::Item> {
+                Q::run_mut(self)
+            }
+        }
+
+        $(impl ComponentStorage<$comp> for $name {
+            fn storage(&self) -> &SparseSet<$comp> {
+                &self.$comp
+            }
+
+            fn storage_mut(&mut self) -> &mut SparseSet<$comp> {
+                &mut self.$comp
+            }
+
+            fn storage_ptr(&mut self) -> *mut SparseSet<$comp> {
+                &mut self.$comp
+            }
+        })+
+    };
+}
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