create node child object

core/node.py

@@ -83,31 +83,25 @@ class Node:
         if self._parent:
             self.bl_node.parent = self._parent.bl_node
 
-    @property
-    def scene(self):
-        """Get the name of the scene used by the node.
-
-        Returns:
-            str: scene name.
-        """
-        if self._scene:
-            return self._scene.name
-
-    @scene.setter
-    def scene(self, value):
-        """Set the blender scene using the bpy Scene object or its name.
+    @classmethod
+    def from_blender_node(cls, bl_node, tree):
+        """Instanciate an abstract class based of the blender node idname.
 
         Args:
-            value (str|bpy.types.Scene): scene name or scene object to set the node.
+            bl_node (bpy.types.Node): Blender Node To create abstraction from.
+            tree (NodeTree): Node tree object node belongs to.
+
+        Returns:
+            Node: Node abstract according to the blender node type.
         """
-        if isinstance(value, str):
-            self._scene = bpy.data.scenes[value]
+        if bl_node.bl_idname == 'CompositorNodeRLayers':
+            return RenderLayersNode(bl_node, tree)
 
-        elif isinstance(value, bpy.types.Scene):
-            self._scene = value
+        elif bl_node.bl_idname == 'CompositorNodeValToRGB':
+            return ColorRampNode(bl_node, tree)
 
-        if self._scene:
-            self.bl_node.scene = self._scene
+        else:
+            return cls(bl_node, tree)
 
     @classmethod
     def from_dict(cls, data, tree):
@@ -122,7 +116,7 @@ class Node:
         """
 
         new_bl_node = tree.bl_node_tree.nodes.new(type=data['bl_idname'])
-        node = cls(new_bl_node, parent=tree)
+        node = cls.from_blender_node(new_bl_node, tree)
 
         node.id = data['id']
         for p in node.parameters:
@@ -167,6 +161,36 @@ class Node:
         return self.data
 
 
+class RenderLayersNode(Node):
+    """Blender Render Layers Node abstraction"""
+
+    @property
+    def scene(self):
+        """Get the name of the scene used by the node.
+
+        Returns:
+            str: scene name.
+        """
+        if self._scene:
+            return self._scene.name
+
+    @scene.setter
+    def scene(self, value):
+        """Set the blender scene using the bpy Scene object or its name.
+
+        Args:
+            value (str|bpy.types.Scene): scene name or scene object to set the node.
+        """
+        if isinstance(value, str):
+            self._scene = bpy.data.scenes[value]
+
+        elif isinstance(value, bpy.types.Scene):
+            self._scene = value
+
+        if self._scene:
+            self.bl_node.scene = self._scene
+
+
 class Link:
     """Blender Link abstraction."""
 

core/node_tree.py

@@ -16,7 +16,7 @@ class NodeTree:
         self.links = [Link(lnk, parent=self) for lnk in self.bl_node_tree.links]
         self.nodes = []
         for n in self.bl_node_tree.nodes:
-            self.nodes.append(Node(n, parent=self))
+            self.nodes.append(Node.from_blender_node(n, self))
 
     def to_dict(self, select_only=False):
         """Convert all blender nodes and links inside the tree into a dictionnary.