Implement atom.appearance.overlays

OpenDreamRuntime/AtomManager.cs

@@ -231,11 +231,11 @@ public bool IsValidAppearanceVar(string name) {
             case "transform":
             case "appearance":
             case "verbs":
-                return true;
-
-            // Get/SetAppearanceVar doesn't handle these
             case "overlays":
             case "underlays":
+                return true;
+
+            // Get/SetAppearanceVar doesn't handle filters right now
             case "filters":
             default:
                 return false;
@@ -370,8 +370,14 @@ public void SetAppearanceVar(IconAppearance appearance, string varName, DreamVal
                 break;
             case "appearance":
                 throw new Exception("Cannot assign the appearance var on an appearance");
-            // TODO: overlays, underlays, filters
-            //       Those are handled separately by whatever is calling SetAppearanceVar currently
+
+            // These should be handled by the DreamObject if being accessed through that
+            case "overlays":
+            case "underlays":
+                throw new Exception($"Cannot assign the {varName} var on an appearance");
+
+            // TODO: filters
+            //       It's handled separately by whatever is calling SetAppearanceVar currently
             default:
                 throw new ArgumentException($"Invalid appearance var {varName}");
         }
@@ -452,8 +458,26 @@ public DreamValue GetAppearanceVar(IconAppearance appearance, string varName) {
             case "appearance":
                 IconAppearance appearanceCopy = new IconAppearance(appearance); // Return a copy
                 return new(appearanceCopy);
-            // TODO: overlays, underlays, filters
-            //       Those are handled separately by whatever is calling GetAppearanceVar currently
+
+            // These should be handled by an atom if referenced through one
+            case "overlays":
+            case "underlays":
+                // In BYOND this just creates a new normal list
+                var lays = varName == "overlays" ? appearance.Overlays : appearance.Underlays;
+                var list = _objectTree.CreateList(lays.Count);
+
+                if (_appearanceSystem != null) {
+                    foreach (var layId in lays) {
+                        var lay = _appearanceSystem.MustGetAppearance(layId);
+
+                        list.AddValue(new(lay));
+                    }
+                }
+
+                return new(list);
+
+            // TODO: filters
+            //       It's handled separately by whatever is calling GetAppearanceVar currently
             default:
                 throw new ArgumentException($"Invalid appearance var {varName}");
         }

OpenDreamRuntime/Objects/Types/DreamList.cs

@@ -1254,27 +1254,21 @@ public override int GetLength() {
 }
 
 // proc args list
-sealed class ProcArgsList : DreamList {
-    private readonly DMProcState _state;
-
-    public ProcArgsList(DreamObjectDefinition listDef, DMProcState state) : base(listDef, 0) {
-        _state = state;
-    }
-
+internal sealed class ProcArgsList(DreamObjectDefinition listDef, DMProcState state) : DreamList(listDef, 0) {
     public override DreamValue GetValue(DreamValue key) {
         if (!key.TryGetValueAsInteger(out var index))
             throw new Exception($"Invalid index into args list: {key}");
-        if (index < 1 || index > _state.ArgumentCount)
+        if (index < 1 || index > state.ArgumentCount)
             throw new Exception($"Out of bounds index on args list: {index}");
 
-        return _state.GetArguments()[index - 1];
+        return state.GetArguments()[index - 1];
     }
 
     // TODO: This would preferably be an IEnumerable<> method. Probably as part of #985.
     public override List<DreamValue> GetValues() {
-        List<DreamValue> values = new(_state.ArgumentCount);
+        List<DreamValue> values = new(state.ArgumentCount);
 
-        foreach (DreamValue value in _state.GetArguments()) {
+        foreach (DreamValue value in state.GetArguments()) {
             values.Add(value);
         }
 
@@ -1284,10 +1278,10 @@ public override List<DreamValue> GetValues() {
     public override void SetValue(DreamValue key, DreamValue value, bool allowGrowth = false) {
         if (!key.TryGetValueAsInteger(out var index))
             throw new Exception($"Invalid index into args list: {key}");
-        if (index < 1 || index > _state.ArgumentCount)
+        if (index < 1 || index > state.ArgumentCount)
             throw new Exception($"Out of bounds index on args list: {index}");
 
-        _state.SetArgument(index - 1, value);
+        state.SetArgument(index - 1, value);
     }
 
     public override void AddValue(DreamValue value) {
@@ -1303,7 +1297,7 @@ public override void Cut(int start = 1, int end = 0) {
     }
 
     public override int GetLength() {
-        return _state.ArgumentCount;
+        return state.ArgumentCount;
     }
 }