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# Regina - A Normal Surface Theory Calculator
# Python Test Suite Component
#
# Copyright (c) 2019-2025, Ben Burton
# For further details contact Ben Burton (bab@debian.org).
#
# Tests involving SnapPea 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/>.
# Fetch the python/testsuite path in the source tree, since we will need
# to access external files.
import sys
if (len(sys.argv) > 1):
testpath = sys.argv[1]
else:
testpath = '.'
class Watcher(PacketListener):
def packetToBeChanged(self, packet):
print('To be changed:')
if packet.isNull():
print(' Null')
else:
print(' Size:', packet.size())
print(' Homology:', packet.homologyFilled())
def packetWasChanged(self, packet):
print('Was changed:')
if packet.isNull():
print(' Null')
else:
print(' Size:', packet.size())
print(' Homology:', packet.homologyFilled())
w = Watcher()
# Without a packet:
t = SnapPeaTriangulation(Example3.whiteheadLink())
print(t.homologyFilled())
dummy = t.fill(3, 4, 0)
print(t.homologyFilled())
t.unfill()
print(t.homologyFilled())
dummy = t.pachner(t.triangle(0))
print(t.isNull())
print()
# With a packet, but without a listener:
t = PacketOfSnapPeaTriangulation(Example3.whiteheadLink())
print(t.homologyFilled())
dummy = t.fill(3, 4, 0)
print(t.homologyFilled())
t.unfill()
print(t.homologyFilled())
dummy = t.pachner(t.triangle(0))
print(t.isNull())
print()
# With a packet and a listener:
t = PacketOfSnapPeaTriangulation(Example3.whiteheadLink())
dummy = t.listen(w)
print(t.homologyFilled())
dummy = t.fill(3, 4, 0)
print(t.homologyFilled())
t.unfill()
print(t.homologyFilled())
dummy = t.pachner(t.triangle(0))
# The watcher should have given incorrect output at this point, since
# packetToBeChanged is currently called too late (after the Regina
# changes but before the SnapPea triangulation is nullified).
# Specifically, we should see the wrong size() being output.
# See the SnapPeaTriangulation class notes for details on this issue.
print(t.isNull())
print()
# Make sure we get the SnapPeaTriangulation output functions, not the
# inherited ones from Triangulation3.
t = SnapPeaTriangulation(ExampleLink.whitehead())
dummy = t.fill(-3,7)
print(t.str())
print()
print(t.detail())
# Verify that both Regina's and SnapPea's import code does the right thing.
# This includes data files written by SnapPea and also data files written by
# other programs (and formatted a little differently).
# It also includes both ideal triangulations (which both import routines
# should handle the same way) and closed triangulations (where SnapPea drills
# and fills, but Regina preserves the triangulation).
def reginaImport(filename):
f = open(filename)
text = f.read()
f.close()
print(Triangulation3.fromSnapPea(text))
print(Triangulation3.fromSnapPea(filename))
print(SnapPeaTriangulation(text))
print(SnapPeaTriangulation(filename))
reginaImport(testpath + '/whitehead.tri')
reginaImport(testpath + '/poincare.tri')
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