First Commit

2026-05-31 10:17:09 +07:00
commit 17a9c69379
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+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2021 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 ifcopenshell.util.element
+import ifcopenshell.util.unit
+
+
+def remove_unit(file: ifcopenshell.file, unit: ifcopenshell.entity_instance) -> None:
+    """Remove a unit
+
+    Be very careful when a unit is removed, as it may mean that previously
+    defined quantities in the model completely lose their meaning.
+
+    :param unit: The unit element to remove
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        # What?
+        unit = ifcopenshell.api.unit.add_context_dependent_unit(model, name="HANDFULS")
+
+        # Yeah maybe not.
+        ifcopenshell.api.unit.remove_unit(model, unit=unit)
+    """
+    unit_assignment = ifcopenshell.util.unit.get_unit_assignment(file)
+    if unit_assignment and unit in unit_assignment.Units:
+        units = list(unit_assignment.Units)
+        units.remove(unit)
+        if units:
+            unit_assignment.Units = units
+        else:
+            file.remove(unit_assignment)
+    # TODO handle other possible unit inverses
+    ifcopenshell.util.element.remove_deep2(file, unit)