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https://github.com/IfcOpenShell/IfcOpenShell.git
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Dion Moult
77 lines
2.9 KiB
Python
77 lines
2.9 KiB
Python
# IfcPatch - IFC patching utiliy
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# Copyright (C) 2020, 2021 Dion Moult <dion@thinkmoult.com>
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#
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# This file is part of IfcPatch.
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#
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# IfcPatch 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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# IfcPatch 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 IfcPatch. If not, see <http://www.gnu.org/licenses/>.
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from collections import deque
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import logging
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import ifcopenshell.util.element
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class Patcher:
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def __init__(self, file: ifcopenshell.file, logger: logging.Logger):
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"""Optimise the filesize of an IFC model by reusing non-rooted elements
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It is possible to non-losslessly optimise the filesize of an IFC model.
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Note that this is usually not recommended. Optimising runs a risk of
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losing some indirect semantic data critical for native IFC authoring.
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Most parties who recommend optimisation are not aware of these risks.
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Optimising is only safe in the context of read-only IFCs.
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If filesize is an issue, another approach would be to use IFCZIP
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instead to compress the model. Optimising the model only typically
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affects filesize and has minimal impact on load times. Large filesizes
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can usually be solved through other means. Consult Bonsai
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documentation on dealing with large models for more details.
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This patch may be run multiple times with diminishing returns.
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Example:
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.. code:: python
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ifcpatch.execute({"input": "input.ifc", "file": model, "recipe": "RecycleNonRootedElements", "arguments": []})
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"""
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self.file = file
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self.logger = logger
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def patch(self):
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deleted = []
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hashes = {}
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for element in self.file:
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if element.is_a("IfcRoot"):
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continue
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h = hash(tuple(element))
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if h in hashes:
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for inverse in self.file.get_inverse(element):
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ifcopenshell.util.element.replace_attribute(inverse, element, hashes[h])
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deleted.append(element.id())
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else:
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hashes[h] = element
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deleted.sort()
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deleted_q = deque(deleted)
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new = ""
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for line in self.file.wrapped_data.to_string().split("\n"):
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try:
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if int(line.split("=")[0][1:]) != deleted_q[0]:
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new += line + "\n"
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else:
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deleted_q.popleft()
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except:
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new += line + "\n"
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self.file = new
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