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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 the independence and lifespans of engine-generated packets.
#
# 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())
print('Script variables #1')
print('Step 1')
a = Container(); aw1 = Watcher(a, 'a1')
print('Step 2')
b = PacketOfTriangulation3(); dummy = b.newSimplex(); bw1 = Watcher(b, 'b1')
print('Step 3')
c = Script(); cw1 = Watcher(c, 'c1')
print('Step 4')
a.append(b)
print('Step 5')
a.append(c)
print('Step 6')
dummy = c.addVariable('foo', b)
print('Step 7')
val = c.variableValue('foo')
print('Step 8')
a = None # destroys a1
print('Step 9')
# (b1 == val) and c1 are orphaned but alive
print(b); print(b.label()); print(b.parent())
print(c); print(c.label()); print(c.parent())
print('Script variables #2')
print('Step 1')
a = Container(); aw2 = Watcher(a, 'a2')
print('Step 2')
b = PacketOfTriangulation3(); dummy = b.newSimplex(); bw2 = Watcher(b, 'b2')
print('Step 3')
c = Script(); cw2 = Watcher(c, 'c2') # destroys c1
print('Step 4')
a.append(b)
print('Step 5')
a.append(c)
print('Step 6')
dummy = c.addVariable('foo', a)
print('Step 7')
val = c.variableValue('foo') # destroys b1
print('Step 8')
a = None
print('Step 9')
val = None # destroys a
print('Step 10')
# b2 and c2 are orphaned but alive
print(b); print(b.label()); print(b.parent())
print(c); print(c.label()); print(c.parent())
print('Example triangulation')
print('Step 1')
f = PacketOfSnapPeaTriangulation(ExampleSnapPea.figureEight()); fw = Watcher(f, 'f')
print('Step 2')
f = None # destroys f
print('Step 3')
print('Vertex link #1')
print('Step 1')
t = PacketOfTriangulation3(Example3.lens(7,1)); tw = Watcher(t, 't1')
print('Step 2')
v = t.vertex(0).buildLink()
print('Step 3')
t = None # destroys t1 but not v1
print('Step 4')
print(v.isoSig())
print('Vertex link #2')
print('Step 1')
t = PacketOfTriangulation3(Example3.lens(7,1)); tw = Watcher(t, 't2')
print('Step 2')
v = t.vertex(0).buildLink() # destroys v1
print('Step 3')
t = None # destroys t2
print('Step 4')
v = None # destroys v2
print('Step 5')
# b2 and c2 are still alive at this point
print(b); print(b.label()); print(b.parent())
print(c); print(c.label()); print(c.parent())
# Destroy their watchers now, so they do not try to call print() as the
# entire python system is shutting down
bw2 = None
cw2 = None
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