New node to get IFC attribute

src/ifcsverchok/__init__.py

@@ -5,7 +5,7 @@ bl_info = {
     "blender": (2, 90, 0),
     "location": "Node Editor",
     "category": "Node",
-    "description": "An extension to Sverchok to generate IFC data",
+    "description": "An extension to Sverchok to work with IFC data",
     "warning": "",
 }
 
@@ -36,6 +36,7 @@ def nodes_index():
         ("ifc.remove", "SvIfcRemove"),
         ("ifc.generate_guid", "SvIfcGenerateGuid"),
         ("ifc.get_property", "SvIfcGetProperty"),
+        ("ifc.get_attribute", "SvIfcGetAttribute"),
         ("ifc.select_blender_objects", "SvIfcSelectBlenderObjects"),
     ])]
 

src/ifcsverchok/nodes/ifc/get_attribute.py

@@ -0,0 +1,41 @@
+import bpy
+import ifcopenshell
+import ifcopenshell.util.element
+import ifcsverchok.helper
+from bpy.props import StringProperty
+from sverchok.node_tree import SverchCustomTreeNode
+from sverchok.data_structure import updateNode
+
+
+class SvIfcGetAttribute(bpy.types.Node, SverchCustomTreeNode, ifcsverchok.helper.SvIfcCore):
+    bl_idname = 'SvIfcGetAttribute'
+    bl_label = 'IFC Get Attribute'
+    entity: StringProperty(name='entity', update=updateNode)
+    attribute_name: StringProperty(name='attribute_name', update=updateNode)
+
+    def sv_init(self, context):
+        self.inputs.new('SvStringsSocket', 'entity').prop_name = 'entity'
+        self.inputs.new('SvStringsSocket', 'attribute_name').prop_name = 'attribute_name'
+        self.outputs.new('SvStringsSocket', 'value')
+
+    def process(self):
+        self.sv_input_names = ['entity', 'attribute_name']
+        self.value_out = []
+        super().process()
+        self.outputs['value'].sv_set(self.value_out)
+
+    def process_ifc(self, entity, attribute_name):
+        try:
+            if attribute_name.isnumeric():
+                self.value_out.append(entity[int(attribute_name)])
+            else:
+                self.value_out.append(entity.get_info()[attribute_name])
+        except:
+            pass
+
+
+def register():
+    bpy.utils.register_class(SvIfcGetAttribute)
+
+def unregister():
+    bpy.utils.unregister_class(SvIfcGetAttribute)