Mercurial > fife-parpg
annotate tools/editor/scripts/events/saferef.py @ 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.
| author | vtchill@33b003aa-7bff-0310-803a-e67f0ece8222 |
|---|---|
| date | Mon, 11 Jan 2010 23:34:52 +0000 |
| parents | |
| children | fa1373b9fa16 |
| rev | line source |
|---|---|
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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:
diff
changeset
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1 """ |
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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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changeset
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2 "Safe weakrefs", originally from pyDispatcher. Copied from django v1.1 beta 1 |
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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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3 |
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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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4 Provides a way to safely weakref any function, including bound methods (which |
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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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5 aren't handled by the core weakref module). |
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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
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6 """ |
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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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7 |
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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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8 import weakref, traceback |
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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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9 |
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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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10 def safeRef(target, onDelete = None): |
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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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11 """Return a *safe* weak reference to a callable target |
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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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12 |
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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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13 target -- the object to be weakly referenced, if it's a |
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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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14 bound method reference, will create a BoundMethodWeakref, |
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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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15 otherwise creates a simple weakref. |
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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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16 onDelete -- if provided, will have a hard reference stored |
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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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17 to the callable to be called after the safe reference |
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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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18 goes out of scope with the reference object, (either a |
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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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19 weakref or a BoundMethodWeakref) as argument. |
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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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20 """ |
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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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21 if hasattr(target, 'im_self'): |
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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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22 if target.im_self is not None: |
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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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23 # Turn a bound method into a BoundMethodWeakref instance. |
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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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24 # Keep track of these instances for lookup by disconnect(). |
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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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25 assert hasattr(target, 'im_func'), """safeRef target %r has im_self, but no im_func, don't know how to create reference"""%( target,) |
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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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26 reference = get_bound_method_weakref( |
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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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27 target=target, |
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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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28 onDelete=onDelete |
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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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29 ) |
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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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30 return reference |
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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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31 if callable(onDelete): |
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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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32 return weakref.ref(target, onDelete) |
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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 else: |
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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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34 return weakref.ref( target ) |
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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 |
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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 class BoundMethodWeakref(object): |
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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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37 """'Safe' and reusable weak references to instance methods |
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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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38 |
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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 BoundMethodWeakref objects provide a mechanism for |
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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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40 referencing a bound method without requiring that the |
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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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41 method object itself (which is normally a transient |
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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 object) is kept alive. Instead, the BoundMethodWeakref |
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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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43 object keeps weak references to both the object and the |
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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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44 function which together define the instance method. |
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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 |
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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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46 Attributes: |
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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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47 key -- the identity key for the reference, calculated |
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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 by the class's calculateKey method applied to the |
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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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49 target instance method |
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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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50 deletionMethods -- sequence of callable objects taking |
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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 single argument, a reference to this object which |
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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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52 will be called when *either* the target object or |
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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 target function is garbage collected (i.e. when |
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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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54 this object becomes invalid). These are specified |
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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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55 as the onDelete parameters of safeRef calls. |
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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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56 weakSelf -- weak reference to the target object |
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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 weakFunc -- weak reference to the target function |
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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 |
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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 Class Attributes: |
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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 _allInstances -- class attribute pointing to all live |
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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 BoundMethodWeakref objects indexed by the class's |
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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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62 calculateKey(target) method applied to the target |
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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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63 objects. This weak value dictionary is used to |
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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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64 short-circuit creation so that multiple references |
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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 to the same (object, function) pair produce the |
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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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66 same BoundMethodWeakref instance. |
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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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67 |
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68 """ |
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69 |
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70 _allInstances = weakref.WeakValueDictionary() |
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71 |
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72 def __new__( cls, target, onDelete=None, *arguments,**named ): |
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73 """Create new instance or return current instance |
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74 |
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75 Basically this method of construction allows us to |
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76 short-circuit creation of references to already- |
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77 referenced instance methods. The key corresponding |
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78 to the target is calculated, and if there is already |
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79 an existing reference, that is returned, with its |
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80 deletionMethods attribute updated. Otherwise the |
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81 new instance is created and registered in the table |
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82 of already-referenced methods. |
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83 """ |
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84 key = cls.calculateKey(target) |
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85 current =cls._allInstances.get(key) |
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86 if current is not None: |
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87 current.deletionMethods.append( onDelete) |
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88 return current |
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89 else: |
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90 base = super( BoundMethodWeakref, cls).__new__( cls ) |
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91 cls._allInstances[key] = base |
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92 base.__init__( target, onDelete, *arguments,**named) |
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93 return base |
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94 |
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95 def __init__(self, target, onDelete=None): |
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96 """Return a weak-reference-like instance for a bound method |
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97 |
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98 target -- the instance-method target for the weak |
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99 reference, must have im_self and im_func attributes |
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100 and be reconstructable via: |
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101 target.im_func.__get__( target.im_self ) |
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102 which is true of built-in instance methods. |
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103 onDelete -- optional callback which will be called |
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104 when this weak reference ceases to be valid |
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105 (i.e. either the object or the function is garbage |
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106 collected). Should take a single argument, |
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107 which will be passed a pointer to this object. |
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108 """ |
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109 def remove(weak, self=self): |
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110 """Set self.isDead to true when method or instance is destroyed""" |
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111 methods = self.deletionMethods[:] |
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112 del self.deletionMethods[:] |
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113 try: |
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114 del self.__class__._allInstances[ self.key ] |
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115 except KeyError: |
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116 pass |
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117 for function in methods: |
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118 try: |
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119 if callable( function ): |
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120 function( self ) |
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121 except Exception, e: |
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122 try: |
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123 traceback.print_exc() |
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124 except AttributeError, err: |
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125 print '''Exception during saferef %s cleanup function %s: %s'''%( |
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126 self, function, e |
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127 ) |
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128 self.deletionMethods = [onDelete] |
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129 self.key = self.calculateKey( target ) |
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130 self.weakSelf = weakref.ref(target.im_self, remove) |
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131 self.weakFunc = weakref.ref(target.im_func, remove) |
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132 self.selfName = str(target.im_self) |
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133 self.funcName = str(target.im_func.__name__) |
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134 |
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135 def calculateKey( cls, target ): |
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136 """Calculate the reference key for this reference |
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137 |
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138 Currently this is a two-tuple of the id()'s of the |
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139 target object and the target function respectively. |
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140 """ |
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141 return (id(target.im_self),id(target.im_func)) |
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142 calculateKey = classmethod( calculateKey ) |
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143 |
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144 def __str__(self): |
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145 """Give a friendly representation of the object""" |
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146 return """%s( %s.%s )"""%( |
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147 self.__class__.__name__, |
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148 self.selfName, |
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149 self.funcName, |
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150 ) |
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151 |
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152 __repr__ = __str__ |
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153 |
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154 def __nonzero__( self ): |
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155 """Whether we are still a valid reference""" |
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156 return self() is not None |
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157 |
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158 def __cmp__( self, other ): |
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159 """Compare with another reference""" |
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160 if not isinstance (other,self.__class__): |
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161 return cmp( self.__class__, type(other) ) |
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162 return cmp( self.key, other.key) |
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163 |
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164 def __call__(self): |
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165 """Return a strong reference to the bound method |
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166 |
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167 If the target cannot be retrieved, then will |
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168 return None, otherwise returns a bound instance |
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169 method for our object and function. |
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170 |
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171 Note: |
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172 You may call this method any number of times, |
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173 as it does not invalidate the reference. |
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174 """ |
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175 target = self.weakSelf() |
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176 if target is not None: |
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177 function = self.weakFunc() |
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178 if function is not None: |
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179 return function.__get__(target) |
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180 return None |
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181 |
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182 class BoundNonDescriptorMethodWeakref(BoundMethodWeakref): |
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183 """A specialized BoundMethodWeakref, for platforms where instance methods |
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184 are not descriptors. |
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185 |
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186 It assumes that the function name and the target attribute name are the |
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187 same, instead of assuming that the function is a descriptor. This approach |
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188 is equally fast, but not 100% reliable because functions can be stored on an |
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189 attribute named differenty than the function's name such as in: |
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190 |
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191 class A: pass |
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192 def foo(self): return "foo" |
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193 A.bar = foo |
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194 |
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195 But this shouldn't be a common use case. So, on platforms where methods |
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196 aren't descriptors (such as Jython) this implementation has the advantage |
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197 of working in the most cases. |
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198 """ |
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199 def __init__(self, target, onDelete=None): |
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200 """Return a weak-reference-like instance for a bound method |
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201 |
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202 target -- the instance-method target for the weak |
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203 reference, must have im_self and im_func attributes |
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204 and be reconstructable via: |
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205 target.im_func.__get__( target.im_self ) |
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206 which is true of built-in instance methods. |
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207 onDelete -- optional callback which will be called |
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208 when this weak reference ceases to be valid |
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209 (i.e. either the object or the function is garbage |
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210 collected). Should take a single argument, |
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211 which will be passed a pointer to this object. |
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212 """ |
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213 assert getattr(target.im_self, target.__name__) == target, \ |
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214 ("method %s isn't available as the attribute %s of %s" % |
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215 (target, target.__name__, target.im_self)) |
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216 super(BoundNonDescriptorMethodWeakref, self).__init__(target, onDelete) |
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217 |
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218 def __call__(self): |
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219 """Return a strong reference to the bound method |
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220 |
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221 If the target cannot be retrieved, then will |
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222 return None, otherwise returns a bound instance |
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223 method for our object and function. |
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224 |
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225 Note: |
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226 You may call this method any number of times, |
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227 as it does not invalidate the reference. |
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228 """ |
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229 target = self.weakSelf() |
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230 if target is not None: |
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231 function = self.weakFunc() |
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232 if function is not None: |
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233 # Using curry() would be another option, but it erases the |
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234 # "signature" of the function. That is, after a function is |
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235 # curried, the inspect module can't be used to determine how |
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236 # many arguments the function expects, nor what keyword |
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237 # arguments it supports, and pydispatcher needs this |
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238 # information. |
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239 return getattr(target, function.__name__) |
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240 return None |
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241 |
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242 def get_bound_method_weakref(target, onDelete): |
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243 """Instantiates the appropiate BoundMethodWeakRef, depending on the details of |
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244 the underlying class method implementation""" |
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245 if hasattr(target, '__get__'): |
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246 # target method is a descriptor, so the default implementation works: |
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247 return BoundMethodWeakref(target=target, onDelete=onDelete) |
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248 else: |
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249 # no luck, use the alternative implementation: |
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250 return BoundNonDescriptorMethodWeakref(target=target, onDelete=onDelete) |