Implement purge map unit when removing georeferencing and removing 2X3 and 4X3 georeferencing in API

src/ifcopenshell-python/ifcopenshell/api/georeference/remove_georeferencing.py

@@ -17,6 +17,8 @@
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
 import ifcopenshell
+import ifcopenshell.api.pset
+import ifcopenshell.util.element
 
 
 def remove_georeferencing(file: ifcopenshell.file) -> None:
@@ -25,8 +27,7 @@ def remove_georeferencing(file: ifcopenshell.file) -> None:
     All georeferencing parameters such as projected CRS and map conversion
     data will be lost.
 
-    :return: None
-    :rtype: None
+    In IFC2X3, the psets will be removed from the IfcProject.
 
     Example:
 
@@ -34,11 +35,17 @@ def remove_georeferencing(file: ifcopenshell.file) -> None:
         # Let's change our mind
         ifcopenshell.api.run("georeference.remove_georeferencing", model)
     """
-
-    map_conversion = file.by_type("IfcMapConversion")[0]
-    projected_crs = file.by_type("IfcProjectedCRS")[0]
-    if projected_crs.MapUnit and len(file.get_inverse(projected_crs.MapUnit)) == 1:
-        # TODO: go deeper for conversion units
-        file.remove(projected_crs.MapUnit)
-    file.remove(projected_crs)
-    file.remove(map_conversion)
+    if file.schema == "IFC2X3":
+        project = file.by_type("IfcProject")[0]
+        if pset := ifcopenshell.util.element.get_pset(project, "ePSet_ProjectedCRS"):
+            ifcopenshell.api.pset.remove_pset(file, project, file.by_id(pset["id"]))
+        if pset := ifcopenshell.util.element.get_pset(project, "ePSet_MapConversion"):
+            ifcopenshell.api.pset.remove_pset(file, project, file.by_id(pset["id"]))
+        return
+    for projected_crs in file.by_type("IfcProjectedCRS"):
+        if (unit := projected_crs.MapUnit) and len(file.get_inverse(unit)) == 1:
+            projected_crs.MapUnit = None
+            ifcopenshell.util.element.remove_deep2(file, unit)
+        file.remove(projected_crs)
+    for coordinate_operation in file.by_type("IfcCoordinateOperation"):
+        file.remove(coordinate_operation)

src/ifcopenshell-python/test/api/georeference/test_remove_georeferencing.py

@@ -0,0 +1,44 @@
+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2022 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of IfcOpenShell.
+#
+# IfcOpenShell 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.
+#
+# IfcOpenShell 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 IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+import test.bootstrap
+import ifcopenshell.api.root
+import ifcopenshell.api.context
+import ifcopenshell.api.georeference
+import ifcopenshell.util.element
+
+
+class TestRemoveGeoreferencing(test.bootstrap.IFC4):
+    def test_removing_georeferencing(self):
+        ifcopenshell.api.root.create_entity(self.file, ifc_class="IfcProject")
+        ifcopenshell.api.context.add_context(self.file, "Model")
+        ifcopenshell.api.georeference.add_georeferencing(self.file)
+        ifcopenshell.api.georeference.remove_georeferencing(self.file)
+        assert len(self.file.by_type("IfcMapConversion")) == 0
+        assert len(self.file.by_type("IfcProjectedCRS")) == 0
+
+
+class TestAddGeoreferencingIFC2X3(test.bootstrap.IFC2X3):
+    def test_adding_georeferencing(self):
+        project = ifcopenshell.api.root.create_entity(self.file, ifc_class="IfcProject")
+        ifcopenshell.api.georeference.add_georeferencing(self.file)
+        ifcopenshell.api.georeference.remove_georeferencing(self.file)
+        conversion = ifcopenshell.util.element.get_pset(project, "ePSet_MapConversion", verbose=True)
+        crs = ifcopenshell.util.element.get_pset(project, "ePSet_ProjectedCRS", verbose=True)
+        assert not conversion
+        assert not crs