[ENH] Input/output signal replacement declarations

Orange/canvas/registry/base.py

@@ -15,7 +15,7 @@
 log = logging.getLogger(__name__)
 
 # Registry hex version
-VERSION_HEX = 0x000102
+VERSION_HEX = 0x000103
 
 
 class WidgetRegistry(object):

Orange/canvas/registry/description.py

@@ -69,15 +69,17 @@ class InputSignal(object):
         A unique id of the input signal.
     doc : str, optional
         A docstring documenting the channel.
-
+    replaces : List[str]
+        A list of names this input replaces.
     """
     def __init__(self, name, type, handler, flags=Single + NonDefault,
-                 id=None, doc=None):
+                 id=None, doc=None, replaces=[]):
         self.name = name
         self.type = type
         self.handler = handler
         self.id = id
         self.doc = doc
+        self.replaces = list(replaces)
 
         if isinstance(flags, str):
             # flags are stored as strings
@@ -130,14 +132,16 @@ class OutputSignal(object):
         A unique id of the output signal.
     doc : str, optional
         A docstring documenting the channel.
-
+    replaces : List[str]
+        A list of names this output replaces.
     """
     def __init__(self, name, type, flags=Single + NonDefault,
-                 id=None, doc=None):
+                 id=None, doc=None, replaces=[]):
         self.name = name
         self.type = type
         self.id = id
         self.doc = doc
+        self.replaces = list(replaces)
 
         if isinstance(flags, str):
             # flags are stored as strings

Orange/canvas/scheme/readwrite.py

@@ -25,6 +25,7 @@
 from .errors import IncompatibleChannelTypeError
 
 from ..registry import global_registry
+from ..registry import WidgetDescription, InputSignal, OutputSignal
 
 log = logging.getLogger(__name__)
 
@@ -607,12 +608,26 @@ def resolve_1_0(scheme_desc, registry):
 
 def resolve_replaced(scheme_desc, registry):
     widgets = registry.widgets()
+    nodes_by_id = {}  # type: Dict[str, _node]
     replacements = {}
-    for desc in widgets:
+    replacements_channels = {}  # type: Dict[str, Tuple[dict, dict]]
+    # collect all the replacement mappings
+    for desc in widgets:  # type: WidgetDescription
         if desc.replaces:
             for repl_qname in desc.replaces:
                 replacements[repl_qname] = desc.qualified_name
 
+        input_repl = {}
+        for idesc in desc.inputs or []:  # type: InputSignal
+            for repl_qname in idesc.replaces or []:  # type: str
+                input_repl[repl_qname] = idesc.name
+        output_repl = {}
+        for odesc in desc.outputs:  # type: OutputSignal
+            for repl_qname in odesc.replaces or []:  # type: str
+                output_repl[repl_qname] = odesc.name
+        replacements_channels[desc.qualified_name] = (input_repl, output_repl)
+
+    # replace the nodes
     nodes = scheme_desc.nodes
     for i, node in list(enumerate(nodes)):
         if not registry.has_widget(node.qualified_name) and \
@@ -621,8 +636,28 @@ def resolve_replaced(scheme_desc, registry):
             desc = registry.widget(qname)
             nodes[i] = node._replace(qualified_name=desc.qualified_name,
                                      project_name=desc.project_name)
-
-    return scheme_desc._replace(nodes=nodes)
+        nodes_by_id[node.id] = nodes[i]
+
+    # replace links
+    links = scheme_desc.links
+    for i, link in list(enumerate(links)):  # type: _link
+        nsource = nodes_by_id[link.source_node_id]
+        nsink = nodes_by_id[link.sink_node_id]
+
+        _, source_rep = replacements_channels.get(
+            nsource.qualified_name, ({}, {}))
+        sink_rep, _ = replacements_channels.get(
+            nsink.qualified_name, ({}, {}))
+
+        if link.source_channel in source_rep:
+            link = link._replace(
+                source_channel=source_rep[link.source_channel])
+        if link.sink_channel in sink_rep:
+            link = link._replace(
+                sink_channel=sink_rep[link.sink_channel])
+        links[i] = link
+
+    return scheme_desc._replace(nodes=nodes, links=links)
 
 
 def scheme_load(scheme, stream, registry=None, error_handler=None):

Orange/widgets/visualize/owtreeviewer.py

@@ -155,9 +155,21 @@ class OWTreeGraph(OWTreeViewer2D):
     name = "Tree Viewer"
     icon = "icons/TreeViewer.svg"
     priority = 35
-    inputs = [("Tree", TreeModel, "ctree")]
-    outputs = [("Selected Data", Table, widget.Default),
-               (ANNOTATED_DATA_SIGNAL_NAME, Table)]
+    inputs = [
+        widget.InputSignal(
+            "Tree", TreeModel, "ctree",
+            # Had different input names before merging from
+            # Classification/Regression tree variants
+            replaces=["Classification Tree", "Regression Tree"])
+    ]
+    outputs = [
+        widget.OutputSignal(
+            "Selected Data", Table, widget.Default, id="selected-data",
+        ),
+        widget.OutputSignal(
+            ANNOTATED_DATA_SIGNAL_NAME, Table, id="annotated-data")
+    ]
+
 
     settingsHandler = ClassValuesContextHandler()
     target_class_index = ContextSetting(0)