cost module web ui:

- add setting options to hide/show columns
- Cost classification column
- New Cost Classification Form to display active classification library, add/delete classification references

src/ifc5d/ifc5d/ifc2json.py

@@ -3,10 +3,11 @@ import ifcopenshell.util.unit
 from typing import Any
 import ifcopenshell.util.cost
 import ifcopenshell.util.date
+from ifcopenshell.util.classification import get_references
+
 
 CostItem = dict[str, Any]
 
-
 class ifc5D2json:
     def __init__(self):
         self.json: str = None
@@ -57,11 +58,21 @@ class ifc5D2json:
         data["id"] = cost_item.id()
         data["IsNestedBy"] = []
         data["IsSum"] = self.check_if_cost_item_is_sum(cost_item)
+        data["Classification"] = self.get_cost_classifications(cost_item)
         json_data.append(data)
         for rel in cost_item.IsNestedBy or []:
             for sub_cost in rel.RelatedObjects:
                 self.extract_cost_item_data(sub_cost, data["IsNestedBy"])
 
+    def get_cost_classifications(self, cost_item: ifcopenshell.entity_instance) -> list:
+        results = []
+        if cost_item:
+            for reference in get_references(cost_item):
+                data = reference.get_info()
+                del data["ReferencedSource"]
+                results.append(data)
+        return results
+    
     def check_if_cost_item_is_sum(self, cost_item: ifcopenshell.entity_instance) -> bool:
         cost_values = []
         if cost_item.is_a("IfcCostItem"):