1 files changed, 39 insertions, 0 deletions
diff --git a/src/systems/spawncheck.rs b/src/systems/spawncheck.rs
new file mode 100644
index 0000000..52ff38e
--- /dev/null
+++ b/src/systems/spawncheck.rs
@@ -0,0 +1,39 @@
+
+use std::collections::HashSet;
+use specs::{
+	WriteStorage,
+	ReadStorage,
+	Entities,
+	System,
+	Join,
+	Read
+};
+
+use crate::{
+	components::{Removed, Requirements, New, Position, Flag, Flags},
+	resources::{Ground, RoomFlags}
+};
+
+
+pub struct SpawnCheck;
+impl <'a> System<'a> for SpawnCheck {
+	type SystemData = (
+		Entities<'a>,
+		ReadStorage<'a, Requirements>,
+		ReadStorage<'a, New>,
+		WriteStorage<'a, Removed>,
+		Read<'a, Ground>,
+		Read<'a, RoomFlags>,
+		ReadStorage<'a, Position>,
+		ReadStorage<'a, Flags>
+	);
+	fn run(&mut self, (entities, requirements, new, mut removeds, ground, roomflags, positions, flags): Self::SystemData) {
+		for (entity, requirements, _new, position) in (&entities, &requirements, &new, &positions).join() {
+			let ground_flags: HashSet<Flag> = ground.flags_on(position.pos, &flags).union(&roomflags.0).cloned().collect();
+			if !(requirements.required_flags.is_subset(&ground_flags) && requirements.blocking_flags.is_disjoint(&ground_flags)){
+				removeds.insert(entity, Removed).unwrap();
+			}
+		}
+	}
+}
+