Mercurial > fife-parpg

annotate tools/editor/scripts/events/saferef.py @ 402:bc6730a27820

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* Fixed a bug where the editor would not activate the new mapview after closing a map * Fixed a crash caused by not all cameras belonging to a map being removed
author cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
date Fri, 29 Jan 2010 10:55:21 +0000
parents d819a70949d2
children
rev   line source
385
fa1373b9fa16 Added the correct header to a few of the editor files.
prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 378
diff changeset
1 # -*- coding: utf-8 -*-
fa1373b9fa16 Added the correct header to a few of the editor files.
prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 378
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2
393
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
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3 # Copyright (c) Django Software Foundation and individual contributors.
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
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4 # All rights reserved.
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
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5 #
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
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6 # Redistribution and use in source and binary forms, with or without modification,
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
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7 # are permitted provided that the following conditions are met:
385
fa1373b9fa16 Added the correct header to a few of the editor files.
prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 378
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8 #
393
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
9 # 1. Redistributions of source code must retain the above copyright notice,
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
10 # this list of conditions and the following disclaimer.
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
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11 #
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
12 # 2. Redistributions in binary form must reproduce the above copyright
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
13 # notice, this list of conditions and the following disclaimer in the
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
14 # documentation and/or other materials provided with the distribution.
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
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15 #
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
16 # 3. Neither the name of Django nor the names of its contributors may be used
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
17 # to endorse or promote products derived from this software without
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
18 # specific prior written permission.
385
fa1373b9fa16 Added the correct header to a few of the editor files.
prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 378
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19 #
393
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
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20 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
21 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
22 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
23 # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
24 # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
25 # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
26 # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
27 # ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
28 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
d819a70949d2 Replaced FIFE license header with Django license in files copied directly from django
cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 385
diff changeset
29 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
385
fa1373b9fa16 Added the correct header to a few of the editor files.
prock@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 378
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30
378
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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31 """
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
32 "Safe weakrefs", originally from pyDispatcher. Copied from django v1.1 beta 1
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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33
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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34 Provides a way to safely weakref any function, including bound methods (which
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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35 aren't handled by the core weakref module).
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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36 """
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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37
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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38 import weakref, traceback
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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39
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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40 def safeRef(target, onDelete = None):
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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41 """Return a *safe* weak reference to a callable target
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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42
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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43 target -- the object to be weakly referenced, if it's a
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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44 bound method reference, will create a BoundMethodWeakref,
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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45 otherwise creates a simple weakref.
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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46 onDelete -- if provided, will have a hard reference stored
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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47 to the callable to be called after the safe reference
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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48 goes out of scope with the reference object, (either a
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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49 weakref or a BoundMethodWeakref) as argument.
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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50 """
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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51 if hasattr(target, 'im_self'):
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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52 if target.im_self is not None:
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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53 # Turn a bound method into a BoundMethodWeakref instance.
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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54 # Keep track of these instances for lookup by disconnect().
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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55 assert hasattr(target, 'im_func'), """safeRef target %r has im_self, but no im_func, don't know how to create reference"""%( target,)
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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56 reference = get_bound_method_weakref(
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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57 target=target,
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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58 onDelete=onDelete
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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59 )
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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60 return reference
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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61 if callable(onDelete):
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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62 return weakref.ref(target, onDelete)
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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63 else:
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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64 return weakref.ref( target )
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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65
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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66 class BoundMethodWeakref(object):
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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67 """'Safe' and reusable weak references to instance methods
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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68
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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69 BoundMethodWeakref objects provide a mechanism for
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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70 referencing a bound method without requiring that the
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
71 method object itself (which is normally a transient
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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72 object) is kept alive. Instead, the BoundMethodWeakref
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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73 object keeps weak references to both the object and the
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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74 function which together define the instance method.
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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75
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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76 Attributes:
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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77 key -- the identity key for the reference, calculated
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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78 by the class's calculateKey method applied to the
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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79 target instance method
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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80 deletionMethods -- sequence of callable objects taking
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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81 single argument, a reference to this object which
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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82 will be called when *either* the target object or
64738befdf3b bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
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diff changeset
83 target function is garbage collected (i.e. when
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diff changeset
84 this object becomes invalid). These are specified
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diff changeset
85 as the onDelete parameters of safeRef calls.
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diff changeset
86 weakSelf -- weak reference to the target object
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diff changeset
87 weakFunc -- weak reference to the target function
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diff changeset
88
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diff changeset
89 Class Attributes:
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90 _allInstances -- class attribute pointing to all live
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diff changeset
91 BoundMethodWeakref objects indexed by the class's
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diff changeset
92 calculateKey(target) method applied to the target
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diff changeset
93 objects. This weak value dictionary is used to
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diff changeset
94 short-circuit creation so that multiple references
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diff changeset
95 to the same (object, function) pair produce the
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diff changeset
96 same BoundMethodWeakref instance.
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97
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98 """
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diff changeset
99
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100 _allInstances = weakref.WeakValueDictionary()
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101
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102 def __new__( cls, target, onDelete=None, *arguments,**named ):
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103 """Create new instance or return current instance
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104
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105 Basically this method of construction allows us to
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diff changeset
106 short-circuit creation of references to already-
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diff changeset
107 referenced instance methods. The key corresponding
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diff changeset
108 to the target is calculated, and if there is already
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diff changeset
109 an existing reference, that is returned, with its
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diff changeset
110 deletionMethods attribute updated. Otherwise the
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diff changeset
111 new instance is created and registered in the table
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diff changeset
112 of already-referenced methods.
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113 """
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114 key = cls.calculateKey(target)
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115 current =cls._allInstances.get(key)
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116 if current is not None:
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117 current.deletionMethods.append( onDelete)
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118 return current
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119 else:
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120 base = super( BoundMethodWeakref, cls).__new__( cls )
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121 cls._allInstances[key] = base
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diff changeset
122 base.__init__( target, onDelete, *arguments,**named)
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diff changeset
123 return base
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124
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125 def __init__(self, target, onDelete=None):
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126 """Return a weak-reference-like instance for a bound method
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127
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diff changeset
128 target -- the instance-method target for the weak
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129 reference, must have im_self and im_func attributes
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diff changeset
130 and be reconstructable via:
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diff changeset
131 target.im_func.__get__( target.im_self )
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diff changeset
132 which is true of built-in instance methods.
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diff changeset
133 onDelete -- optional callback which will be called
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diff changeset
134 when this weak reference ceases to be valid
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diff changeset
135 (i.e. either the object or the function is garbage
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diff changeset
136 collected). Should take a single argument,
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diff changeset
137 which will be passed a pointer to this object.
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138 """
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diff changeset
139 def remove(weak, self=self):
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diff changeset
140 """Set self.isDead to true when method or instance is destroyed"""
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141 methods = self.deletionMethods[:]
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142 del self.deletionMethods[:]
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vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
143 try:
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144 del self.__class__._allInstances[ self.key ]
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145 except KeyError:
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diff changeset
146 pass
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147 for function in methods:
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diff changeset
148 try:
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149 if callable( function ):
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diff changeset
150 function( self )
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151 except Exception, e:
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152 try:
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153 traceback.print_exc()
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154 except AttributeError, err:
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155 print '''Exception during saferef %s cleanup function %s: %s'''%(
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diff changeset
156 self, function, e
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157 )
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diff changeset
158 self.deletionMethods = [onDelete]
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159 self.key = self.calculateKey( target )
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160 self.weakSelf = weakref.ref(target.im_self, remove)
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161 self.weakFunc = weakref.ref(target.im_func, remove)
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162 self.selfName = str(target.im_self)
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163 self.funcName = str(target.im_func.__name__)
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164
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165 def calculateKey( cls, target ):
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166 """Calculate the reference key for this reference
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167
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168 Currently this is a two-tuple of the id()'s of the
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169 target object and the target function respectively.
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170 """
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171 return (id(target.im_self),id(target.im_func))
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172 calculateKey = classmethod( calculateKey )
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173
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174 def __str__(self):
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175 """Give a friendly representation of the object"""
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176 return """%s( %s.%s )"""%(
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177 self.__class__.__name__,
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178 self.selfName,
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179 self.funcName,
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180 )
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181
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182 __repr__ = __str__
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183
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184 def __nonzero__( self ):
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185 """Whether we are still a valid reference"""
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186 return self() is not None
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187
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188 def __cmp__( self, other ):
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189 """Compare with another reference"""
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190 if not isinstance (other,self.__class__):
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191 return cmp( self.__class__, type(other) )
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192 return cmp( self.key, other.key)
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193
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194 def __call__(self):
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195 """Return a strong reference to the bound method
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196
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197 If the target cannot be retrieved, then will
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198 return None, otherwise returns a bound instance
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diff changeset
199 method for our object and function.
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200
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201 Note:
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202 You may call this method any number of times,
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diff changeset
203 as it does not invalidate the reference.
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204 """
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205 target = self.weakSelf()
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diff changeset
206 if target is not None:
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diff changeset
207 function = self.weakFunc()
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diff changeset
208 if function is not None:
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209 return function.__get__(target)
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210 return None
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211
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212 class BoundNonDescriptorMethodWeakref(BoundMethodWeakref):
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213 """A specialized BoundMethodWeakref, for platforms where instance methods
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214 are not descriptors.
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215
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216 It assumes that the function name and the target attribute name are the
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diff changeset
217 same, instead of assuming that the function is a descriptor. This approach
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218 is equally fast, but not 100% reliable because functions can be stored on an
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219 attribute named differenty than the function's name such as in:
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220
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221 class A: pass
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222 def foo(self): return "foo"
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223 A.bar = foo
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224
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225 But this shouldn't be a common use case. So, on platforms where methods
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226 aren't descriptors (such as Jython) this implementation has the advantage
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227 of working in the most cases.
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228 """
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229 def __init__(self, target, onDelete=None):
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230 """Return a weak-reference-like instance for a bound method
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231
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232 target -- the instance-method target for the weak
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233 reference, must have im_self and im_func attributes
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234 and be reconstructable via:
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235 target.im_func.__get__( target.im_self )
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236 which is true of built-in instance methods.
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237 onDelete -- optional callback which will be called
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238 when this weak reference ceases to be valid
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239 (i.e. either the object or the function is garbage
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240 collected). Should take a single argument,
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241 which will be passed a pointer to this object.
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242 """
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243 assert getattr(target.im_self, target.__name__) == target, \
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244 ("method %s isn't available as the attribute %s of %s" %
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245 (target, target.__name__, target.im_self))
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246 super(BoundNonDescriptorMethodWeakref, self).__init__(target, onDelete)
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247
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248 def __call__(self):
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249 """Return a strong reference to the bound method
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250
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251 If the target cannot be retrieved, then will
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252 return None, otherwise returns a bound instance
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253 method for our object and function.
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254
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255 Note:
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256 You may call this method any number of times,
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257 as it does not invalidate the reference.
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258 """
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259 target = self.weakSelf()
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260 if target is not None:
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261 function = self.weakFunc()
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262 if function is not None:
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263 # Using curry() would be another option, but it erases the
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264 # "signature" of the function. That is, after a function is
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265 # curried, the inspect module can't be used to determine how
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266 # many arguments the function expects, nor what keyword
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267 # arguments it supports, and pydispatcher needs this
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268 # information.
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269 return getattr(target, function.__name__)
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270 return None
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271
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272 def get_bound_method_weakref(target, onDelete):
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273 """Instantiates the appropiate BoundMethodWeakRef, depending on the details of
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274 the underlying class method implementation"""
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275 if hasattr(target, '__get__'):
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276 # target method is a descriptor, so the default implementation works:
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277 return BoundMethodWeakref(target=target, onDelete=onDelete)
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278 else:
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279 # no luck, use the alternative implementation:
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280 return BoundNonDescriptorMethodWeakref(target=target, onDelete=onDelete)