Allow to use default parameters (passing nothing to the add method except the class name

Author: bakpaul

stlib/__init__.py

@@ -26,8 +26,9 @@ def checkName(context : Sofa.Core.Node, name):
     # Check if a name is provided, if not, use the one of the class
     params = kwargs.copy()
     if isinstance(typeName, type) and issubclass(typeName, BasePrefab): #Only for prefabs
-        if "parameters" not in params or len(params.keys()) > 1:
+        if len(params.keys()) > 1 or (len(params.keys()) == 1 and "parameters" not in params):
             raise RuntimeError("Invalid argument, a prefab takes only the \"parameters\" kwargs as input")
+
     elif "name" not in params : #This doesn't apply to prefab
         if isinstance(typeName, str):
             params["name"] = typeName
@@ -42,7 +43,7 @@ def checkName(context : Sofa.Core.Node, name):
         else:
             raise RuntimeError("Invalid argument ", typeName)
 
-    if isinstance(typeName, type) and issubclass(typeName, BasePrefab):
+    if isinstance(typeName, type) and issubclass(typeName, BasePrefab) and len(params.keys()) == 1:
         params["parameters"].name = checkName(self, params["parameters"].name)
     else:
         params["name"] = checkName(self, params["name"])