1 files changed, 31 insertions, 0 deletions
diff --git a/src/system.rs b/src/system.rs
new file mode 100644
index 0000000..7df8af8
--- /dev/null
+++ b/src/system.rs
@@ -0,0 +1,31 @@
+use crate::actor::{Actorful, Slot, Type};
+use crate::number::Number;
+
+pub struct System {
+    pub screen_buffer: Vec<u32>,
+}
+
+impl Actorful for System {
+    fn inputs() -> Vec<Slot> {
+        let nonnegative_int = Type::NumberInRange {
+            min: Some(Number::from(0)),
+            max: None,
+        };
+        let screen_position_type = Type::Record {
+            name: "Screen Position".to_string(),
+            fields: vec![
+                Slot { name: "X".to_string(), r#type: nonnegative_int.clone() },
+                Slot { name: "Y".to_string(), r#type: nonnegative_int },
+            ],
+        };
+        vec![Slot { name: "mouse_position".to_string(), r#type: screen_position_type }]
+    }
+
+    fn outputs() -> Vec<Slot> {
+        let u24 = Type::NumberInRange {
+            min: Some(Number::from(0)),
+            max: Some(Number::from(1 << 24 - 1)),
+        };
+        vec![Slot { name: "screen_buffer".to_string(), r#type: Type::List { contents: Box::new(u24) }}]
+    }
+}