Add support for calling GetComponent<T> on GameObjects

- Add support for calling GetComponent<T> on gameobjects by getting their transform component internally and calling it on that.

Author: MerlinVR

Assets/UdonSharp/Editor/UdonSharpExpressionCapture.cs

@@ -661,7 +661,22 @@ private SymbolDefinition InvokeExtern(SymbolDefinition[] invokeParams)
 
             // Now make the needed symbol definitions and run the invoke
             if (!targetMethod.IsStatic && !(targetMethod is ConstructorInfo)/* && targetMethod.Name != "Instantiate"*/) // Constructors don't take an instance argument, but are still classified as an instance method
-                visitorContext.uasmBuilder.AddPush(accessSymbol);
+            {
+                if (genericTypeArguments != null && typeof(GameObject).IsAssignableFrom(accessSymbol.symbolCsType)) // Handle GetComponent<T> on gameobjects by getting their transform first
+                {
+                    using (ExpressionCaptureScope transformComponentGetScope = new ExpressionCaptureScope(visitorContext, null))
+                    {
+                        transformComponentGetScope.SetToLocalSymbol(accessSymbol);
+                        transformComponentGetScope.ResolveAccessToken("transform");
+
+                        visitorContext.uasmBuilder.AddPush(transformComponentGetScope.ExecuteGet());
+                    }
+                }
+                else
+                {
+                    visitorContext.uasmBuilder.AddPush(accessSymbol);
+                }
+            }
 
             foreach (SymbolDefinition invokeParam in expandedParams)
                 visitorContext.uasmBuilder.AddPush(invokeParam);