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.owner
+import ifcopenshell.util.element
+
+
+def unassign_declaration(
+    file: ifcopenshell.file,
+    definitions: list[ifcopenshell.entity_instance],
+    relating_context: ifcopenshell.entity_instance,
+) -> None:
+    """Unassigns a list of objects from a project or project library
+
+    Typically used to remove an asset from a project library.
+
+    :param definitions: The list of objects you want to undeclare.
+        Typically a list of assets.
+    :param relating_context: The IfcProject, or more commonly the
+        IfcProjectLibrary that you want the object to no longer be part of.
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        # Programmatically generate a library. You could do this visually too.
+        library = ifcopenshell.api.project.create_file()
+        root = ifcopenshell.api.root.create_entity(library, ifc_class="IfcProject", name="Demo Library")
+        context = ifcopenshell.api.root.create_entity(library,
+            ifc_class="IfcProjectLibrary", name="Demo Library")
+
+        # It's necessary to say our library is part of our project.
+        ifcopenshell.api.project.assign_declaration(library, definitions=[context], relating_context=root)
+
+        # Remove the library from our project
+        ifcopenshell.api.project.unassign_declaration(library, definitions=[context], relating_context=root)
+    """
+    settings = {
+        "definitions": definitions,
+        "relating_context": relating_context,
+    }
+
+    definitions = set(settings["definitions"])
+    rels = {rel for obj in definitions if (rel := next(iter(obj.HasContext), None))}
+
+    for rel in rels:
+        related_definitions = set(rel.RelatedDefinitions) - definitions
+        if related_definitions:
+            rel.RelatedDefinitions = list(related_definitions)
+            ifcopenshell.api.owner.update_owner_history(file, element=rel)
+        else:
+            history = rel.OwnerHistory
+            file.remove(rel)
+            if history:
+                ifcopenshell.util.element.remove_deep2(file, history)