From 3904162360361b89609dc1849390fca8e36e809b Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Tue, 3 Oct 2023 21:19:11 +1100
Subject: [PATCH] New IfcPatch recipe to fix Revit bug with hardcoded Uniformat
 classification

---
 .../RemoveRevitUniformatClassification.py     | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 src/ifcpatch/ifcpatch/recipes/RemoveRevitUniformatClassification.py

diff --git a/src/ifcpatch/ifcpatch/recipes/RemoveRevitUniformatClassification.py b/src/ifcpatch/ifcpatch/recipes/RemoveRevitUniformatClassification.py
new file mode 100644
index 0000000000..22cad79bba
--- /dev/null
+++ b/src/ifcpatch/ifcpatch/recipes/RemoveRevitUniformatClassification.py
@@ -0,0 +1,60 @@
+# IfcPatch - IFC patching utiliy
+# Copyright (C) 2023 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of IfcPatch.
+#
+# IfcPatch is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# IfcPatch is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcPatch.  If not, see <http://www.gnu.org/licenses/>.
+
+
+class Patcher:
+    def __init__(self, src, file, logger):
+        """Removes the built-in Revit Uniformat classification.
+
+        Revit has a bug (see https://github.com/Autodesk/revit-ifc/issues/486)
+        where it always inserts a Uniformat classification regardless if your
+        project needs it or not. This patch removes it.
+
+        Example:
+
+        .. code:: python
+
+            ifcpatch.execute({"input": model, "recipe": "RemoveRevitUniformatClassification"})
+        """
+        self.src = src
+        self.file = file
+        self.logger = logger
+
+    def patch(self):
+        for classification in self.file.by_type("IfcClassification"):
+            if classification.Name != "Uniformat":
+                continue
+            references = self.get_references(classification)
+            for reference in references:
+                self.file.remove(reference)
+            self.file.remove(classification)
+            for rel in self.file.by_type("IfcRelAssociatesClassification"):
+                if not rel.RelatingClassification:
+                    self.file.remove(rel)
+            for rel in self.file.by_type("IfcExternalReferenceRelationship"):
+                if not rel.RelatingReference:
+                    self.file.remove(rel)
+
+    def get_references(self, classification):
+        results = []
+        if not classification.HasReferences:
+            return results
+        for reference in classification.HasReferences:
+            results.append(reference)
+            results.extend(self.get_references(reference))
+        return results