Use deepcopy to copy data during expansion

tests/instances/resources/instance_extended_attribute.vspec

@@ -0,0 +1,17 @@
+Vehicle:
+  type: branch
+  instances: Test[1,3]
+  description: High-level vehicle data.
+
+Vehicle.SomeThing:
+  type: sensor
+  description: "test"
+  datatype: string
+  dbc:
+    signal: bababa
+    transform:
+      mapping:
+        - from: 0
+          to: false
+        - from: 1
+          to: true

tests/instances/test_instances.py

@@ -7,6 +7,7 @@
 # provisions of the license provided by the LICENSE file in this repository.
 #
 
+from typing import Dict
 from vspec.model.vsstree import VSSNode
 from vspec.model.constants import VSSType, VSSTreeType
 import vspec
@@ -170,3 +171,32 @@ def test_exclusion_from_instance(request):
 
         assert "Vehicle.ExcludeSomeThing" in name_list
         assert "Vehicle.ExcludeNode" in name_list
+
+
+def test_extended_attribute(request):
+    test_path = os.path.dirname(request.fspath)
+    # load the file
+    tree = vspec.load_tree(os.path.join(test_path, "resources/instance_extended_attribute.vspec"), [os.path.join(
+                        test_path, "resources/")], VSSTreeType.SIGNAL_TREE)
+
+    # check if root node has 3 children
+    assert len(tree.children) == 3
+
+    # Programmatically change value of dbc/signal for instance in Test2
+
+    for child in tree.children:
+        if child.qualified_name() == "Vehicle.Test2":
+            assert len(child.children) == 1
+            assert child.children[0].name == "SomeThing"  # <... SomeThing
+            assert len(child.children[0].extended_attributes.items()) == 1
+            assert isinstance(child.children[0].extended_attributes["dbc"], Dict)
+            assert isinstance(child.children[0].extended_attributes["dbc"]["signal"], str)
+            assert child.children[0].extended_attributes["dbc"]["signal"] == "bababa"
+            child.children[0].extended_attributes["dbc"]["signal"] = "lalala"
+
+    for child in tree.children:
+        if child.qualified_name() == "Vehicle.Test2":
+            assert child.children[0].extended_attributes["dbc"]["signal"] == "lalala"
+        else:
+            # Make sure that all other instances keeps same name
+            assert child.children[0].extended_attributes["dbc"]["signal"] == "bababa"

tests/vspec/test_overlay_on_instance/test.vspec

@@ -4,7 +4,7 @@ A:
   description: Branch A.
 
 
-#  Instances defined a slist
+#  Instances defined as list
 
 A.B:
   type: branch
@@ -32,4 +32,4 @@ A.S.T:
   type: sensor
   unit: km
   description: Signal A.S.T
-  comment: Orig comment.
+  comment: Orig comment.

vspec/model/vsstree.py

@@ -61,7 +61,9 @@ class VSSNode(Node):
     deprecation = ""
 
     def __deepcopy__(self, memo):
-        return VSSNode(self.name, self.source_dict.copy(), self.available_types.copy(),
+        # Deep copy of source_dict and children needed as overlay or programmatic changes
+        # in exporters otherwise risk changing values not only for current instances but also for others
+        return VSSNode(self.name, copy.deepcopy(self.source_dict), self.available_types.copy(),
                        parent=None, children=copy.deepcopy(self.children, memo))
 
     def __init__(self, name, source_dict: dict, available_types: Set[str], parent=None,