Add ILuaToStringBinding so that CustomClrObjects can implement __tost…

…ring.
OpenRA · Apr 26, 2014 · 483f326 · 483f326
1 parent 866eb48
commit 483f326
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Showing 2 changed files with 25 additions and 0 deletions.
diff --git a/Eluant/LuaRuntime.cs b/Eluant/LuaRuntime.cs
@@ -212,6 +212,7 @@ private void Initialize()
 
             metamethodCallbacks["__newindex"] = CreateCallbackWrapper(NewindexCallback);
             metamethodCallbacks["__index"] = CreateCallbackWrapper(IndexCallback);
+            metamethodCallbacks["__tostring"] = CreateCallbackWrapper(ToStringCallback);
 
             metamethodCallbacks["__add"] = CreateCallbackWrapper(state => BinaryOperatorCallback<ILuaAdditionBinding>(state, (i, a, b) => i.Add(this, a, b)));
             metamethodCallbacks["__sub"] = CreateCallbackWrapper(state => BinaryOperatorCallback<ILuaSubtractionBinding>(state, (i, a, b) => i.Subtract(this, a, b)));
@@ -835,6 +836,24 @@ private int IndexCallback(IntPtr state)
             });
         }
 
+        private int ToStringCallback(IntPtr state)
+        {
+            return LuaToClrBoundary(state, toDispose => {
+                var obj = GetClrObject<LuaClrObjectValue>(1).BackingCustomObject as ILuaToStringBinding;
+
+                if (obj == null) {
+                    throw new LuaException("CLR object does not support indexing.");
+                }
+
+                var value = obj.ToString(this);
+                toDispose.Add(value);
+
+                Push(value);
+
+                return 1;
+            });
+        }
+
         private int CallCallback(IntPtr state)
         {
             return LuaToClrBoundary(state, toDispose => {

diff --git a/Eluant/ObjectBinding/Bindings.cs b/Eluant/ObjectBinding/Bindings.cs
@@ -41,6 +41,12 @@ public interface ILuaTableBinding
         LuaValue this[LuaRuntime runtime, LuaValue key] { get; set; }
     }
 
+    [Metamethod("__tostring")]
+    public interface ILuaToStringBinding
+    {
+        LuaValue ToString(LuaRuntime runtime);
+    }
+
     [Metamethod("__add")]
     public interface ILuaAdditionBinding
     {