52 lines
1.8 KiB
Python
52 lines
1.8 KiB
Python
# IfcOpenShell - IFC toolkit and geometry engine
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# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
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#
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# This file is part of IfcOpenShell.
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#
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# IfcOpenShell is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# IfcOpenShell is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with IfcOpenShell. If not, see <http://www.gnu.org/licenses/>.
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import ifcopenshell.util.element
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import ifcopenshell.util.unit
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def remove_unit(file: ifcopenshell.file, unit: ifcopenshell.entity_instance) -> None:
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"""Remove a unit
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Be very careful when a unit is removed, as it may mean that previously
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defined quantities in the model completely lose their meaning.
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:param unit: The unit element to remove
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:return: None
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Example:
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.. code:: python
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# What?
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unit = ifcopenshell.api.unit.add_context_dependent_unit(model, name="HANDFULS")
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# Yeah maybe not.
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ifcopenshell.api.unit.remove_unit(model, unit=unit)
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"""
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unit_assignment = ifcopenshell.util.unit.get_unit_assignment(file)
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if unit_assignment and unit in unit_assignment.Units:
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units = list(unit_assignment.Units)
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units.remove(unit)
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if units:
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unit_assignment.Units = units
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else:
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file.remove(unit_assignment)
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# TODO handle other possible unit inverses
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ifcopenshell.util.element.remove_deep2(file, unit)
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