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
+import ifcopenshell.api.pset
+import ifcopenshell.util.element
+
+
+def unshare_pset(
+    file: ifcopenshell.file,
+    products: list[ifcopenshell.entity_instance],
+    pset: ifcopenshell.entity_instance,
+) -> list[ifcopenshell.entity_instance]:
+    """Copy a shared pset as linked only to the provided elements.
+
+    Note that method will create a copy of the pset for each element provided.
+
+    :param products: Elements (or element types) to link the pset to.
+    :param pset: Shared property set.
+    :return: List of copied property sets.
+
+    Example:
+
+    .. code:: python
+
+        element1 = ifcopenshell.api.root.create_entity(self.file, ifc_class="IfcWall")
+        element2 = ifcopenshell.api.root.create_entity(self.file, ifc_class="IfcWall")
+        ifcopenshell.api.pset.assign_pset(self.file, [element1, element2], pset)
+
+        # Pset is now shared by 2 elements.
+        assert ifcopenshell.util.element.get_elements_by_pset(pset) == {element1, element2}
+
+        new_psets = ifcopenshell.api.pset.unshare_pset(self.file, [element2], pset)
+
+        # element2 was unassigned from the original pset.
+        assert ifcopenshell.util.element.get_elements_by_pset(pset) == {element1}
+        new_pset = new_psets[0]
+
+        # New pset was created and was assigned to element2.
+        assert new_pset != pset
+        assert ifcopenshell.util.element.get_elements_by_pset(new_pset) == {element2}
+    """
+
+    if not products:
+        raise Exception("No products provided.")
+
+    # If pset has no other elements besides the provided products,
+    # then we skip the first product, so it won't get additional pset copy
+    # leaving the original pset orphaned.
+    pset_elements = ifcopenshell.util.element.get_elements_by_pset(pset)
+    products_original = products
+
+    if set(products) == pset_elements:
+        products = products[1:]
+
+    if not products:
+        raise Exception(f"Provided product is the only element to which pset is assigned: {products_original[0]}.")
+
+    products_occurrences: set[ifcopenshell.entity_instance] = set()
+    products_types: set[ifcopenshell.entity_instance] = set()
+    for product in products:
+        if product.is_a("IfcTypeProduct"):
+            products_types.add(product)
+        else:
+            products_occurrences.add(product)
+
+    ifcopenshell.api.pset.unassign_pset(file, products, pset)
+
+    pset_copies: list[ifcopenshell.entity_instance] = []
+    for product in products:
+        # No need to consider about profile/material properties since
+        # they are assigned to 1 element directly and therefore cannot be shared.
+        # Don't copy_deep to keep it light - edit_pset supports unsharing shared props.
+        pset_copy = ifcopenshell.util.element.copy(file, pset)
+        pset_copies.append(pset_copy)
+        ifcopenshell.api.pset.assign_pset(file, [product], pset_copy)
+
+    return pset_copies