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# Regina - A Normal Surface Theory Calculator
# Python Test Suite Component
#
# Copyright (c) 2015-2025, Ben Burton
# For further details contact Ben Burton (bab@debian.org).
#
# Tests Regina's mechanism for snapshotting triangulations.
#
# This file is a single component of Regina's python test suite. To run
# the python test suite, move to the main python directory in the source
# tree and run "make check".
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# As an exception, when this program is distributed through (i) the
# App Store by Apple Inc.; (ii) the Mac App Store by Apple Inc.; or
# (iii) Google Play by Google Inc., then that store may impose any
# digital rights management, device limits and/or redistribution
# restrictions that are required by its terms of service.
#
# This program 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
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
class Watcher(PacketListener):
def __init__(self, packet, label):
PacketListener.__init__(self)
packet.setLabel(label)
packet.listen(self)
def packetBeingDestroyed(self, packet):
print('Destroying: ' + packet.label())
# Make sure that snapshotting works.
t = PacketOfTriangulation3(Example3.whiteheadLink())
w1 = Watcher(t, 'original')
print(t.isoSig(), t.isReadOnlySnapshot())
a = AngleStructures(t)
print(a)
print(a.triangulation().isoSig())
dummy = a.triangulation().pachner(t.tetrahedron(0))
print(t.isoSig(), t.isReadOnlySnapshot())
print(a.triangulation().isoSig(), a.triangulation().isReadOnlySnapshot())
print('Step 1')
t = None
print('Step 2')
a = None
# This should destroy a.triangulation(), but since that does not have a
# packet wrapper we cannot observe its destruction here.
print('Step 3')
print()
# Test that snapshotting happens when we nullify a SnapPea triangulation.
t = ExampleSnapPea.whiteheadLink()
print(t.isoSig(), t.isReadOnlySnapshot())
a = AngleStructures(t)
print(a)
print(a.triangulation().isoSig())
dummy = a.triangulation().pachner(t.tetrahedron(0))
print(t.isoSig(), t.isReadOnlySnapshot()) # should be an empty triangulation
print(a.triangulation().isoSig(), a.triangulation().isReadOnlySnapshot())
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