sugarlabs/sugar-toolkit-gtk3
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Import sugar-base into sugar-toolkit

Browse Source 
Probably needs cleaning up a bit. And we use pygtk-codegen, ugh...

This is the commit id when we imported sugar-base:
b9406e5c9c9df5404c5b0d995178b5edb4d93628

Signed-off-by: Daniel Drake <dsd@laptop.org>
[squashed two patches into one]
Signed-off-by: Sascha Silbe <silbe@activitycentral.com>
This commit is contained in:
Daniel Drake
2011-10-29 14:06:45 +01:00
committed by Simon Schampijer
parent b9a19e952f
commit e2c07af748
27 changed files with 5357 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/sugar3/dispatch/Makefile.am
+9
View File
@@ -0,0 +1,9 @@
sugardir = $(pythondir)/sugar3/dispatch
sugar_PYTHON = \
__init__.py \
dispatcher.py \
saferef.py
EXTRA_DIST = \
license.txt
src/sugar3/dispatch/__init__.py
+9
View File
@@ -0,0 +1,9 @@
"""Multi-consumer multi-producer dispatching mechanism
Originally based on pydispatch (BSD) http://pypi.python.org/pypi/PyDispatcher/2.0.1
See license.txt for original license.
Heavily modified for Django's purposes.
"""
from sugar.dispatch.dispatcher import Signal
src/sugar3/dispatch/dispatcher.py
+191
View File
@@ -0,0 +1,191 @@
import weakref
try:
set
except NameError:
from sets import Set as set # Python 2.3 fallback
from sugar.dispatch import saferef
WEAKREF_TYPES = (weakref.ReferenceType, saferef.BoundMethodWeakref)
def _make_id(target):
if hasattr(target, 'im_func'):
return (id(target.im_self), id(target.im_func))
return id(target)
class Signal(object):
"""Base class for all signals
Internal attributes:
receivers -- { receriverkey (id) : weakref(receiver) }
"""
def __init__(self, providing_args=None):
"""providing_args -- A list of the arguments this signal can pass along in
a send() call.
"""
self.receivers = []
if providing_args is None:
providing_args = []
self.providing_args = set(providing_args)
def connect(self, receiver, sender=None, weak=True, dispatch_uid=None):
"""Connect receiver to sender for signal
receiver -- a function or an instance method which is to
receive signals. Receivers must be
hashable objects.
if weak is True, then receiver must be weak-referencable
(more precisely saferef.safeRef() must be able to create
a reference to the receiver).
Receivers must be able to accept keyword arguments.
If receivers have a dispatch_uid attribute, the receiver will
not be added if another receiver already exists with that
dispatch_uid.
sender -- the sender to which the receiver should respond
Must either be of type Signal, or None to receive events
from any sender.
weak -- whether to use weak references to the receiver
By default, the module will attempt to use weak
references to the receiver objects. If this parameter
is false, then strong references will be used.
dispatch_uid -- an identifier used to uniquely identify a particular
instance of a receiver. This will usually be a string, though it
may be anything hashable.
returns None
"""
if dispatch_uid:
lookup_key = (dispatch_uid, _make_id(sender))
else:
lookup_key = (_make_id(receiver), _make_id(sender))
if weak:
receiver = saferef.safeRef(receiver, onDelete=self._remove_receiver)
for r_key, _ in self.receivers:
if r_key == lookup_key:
break
else:
self.receivers.append((lookup_key, receiver))
def disconnect(self, receiver=None, sender=None, weak=True, dispatch_uid=None):
"""Disconnect receiver from sender for signal
receiver -- the registered receiver to disconnect. May be none if
dispatch_uid is specified.
sender -- the registered sender to disconnect
weak -- the weakref state to disconnect
dispatch_uid -- the unique identifier of the receiver to disconnect
disconnect reverses the process of connect.
If weak references are used, disconnect need not be called.
The receiver will be remove from dispatch automatically.
returns None
"""
if dispatch_uid:
lookup_key = (dispatch_uid, _make_id(sender))
else:
lookup_key = (_make_id(receiver), _make_id(sender))
for idx, (r_key, _) in enumerate(self.receivers):
if r_key == lookup_key:
del self.receivers[idx]
def send(self, sender, **named):
"""Send signal from sender to all connected receivers.
sender -- the sender of the signal
Either a specific object or None.
named -- named arguments which will be passed to receivers.
Returns a list of tuple pairs [(receiver, response), ... ].
If any receiver raises an error, the error propagates back
through send, terminating the dispatch loop, so it is quite
possible to not have all receivers called if a raises an
error.
"""
responses = []
if not self.receivers:
return responses
for receiver in self._live_receivers(_make_id(sender)):
response = receiver(signal=self, sender=sender, **named)
responses.append((receiver, response))
return responses
def send_robust(self, sender, **named):
"""Send signal from sender to all connected receivers catching errors
sender -- the sender of the signal
Can be any python object (normally one registered with
a connect if you actually want something to occur).
named -- named arguments which will be passed to receivers.
These arguments must be a subset of the argument names
defined in providing_args.
Return a list of tuple pairs [(receiver, response), ... ],
may raise DispatcherKeyError
if any receiver raises an error (specifically any subclass of Exception),
the error instance is returned as the result for that receiver.
"""
responses = []
if not self.receivers:
return responses
# Call each receiver with whatever arguments it can accept.
# Return a list of tuple pairs [(receiver, response), ... ].
for receiver in self._live_receivers(_make_id(sender)):
try:
response = receiver(signal=self, sender=sender, **named)
except Exception, err:
responses.append((receiver, err))
else:
responses.append((receiver, response))
return responses
def _live_receivers(self, senderkey):
"""Filter sequence of receivers to get resolved, live receivers
This checks for weak references
and resolves them, then returning only live
receivers.
"""
none_senderkey = _make_id(None)
for (receiverkey, r_senderkey), receiver in self.receivers:
if r_senderkey == none_senderkey or r_senderkey == senderkey:
if isinstance(receiver, WEAKREF_TYPES):
# Dereference the weak reference.
receiver = receiver()
if receiver is not None:
yield receiver
else:
yield receiver
def _remove_receiver(self, receiver):
"""Remove dead receivers from connections."""
to_remove = []
for key, connected_receiver in self.receivers:
if connected_receiver == receiver:
to_remove.append(key)
for key in to_remove:
for idx, (r_key, _) in enumerate(self.receivers):
if r_key == key:
del self.receivers[idx]
src/sugar3/dispatch/license.txt
+66
View File
@@ -0,0 +1,66 @@
sugar.dispatch was originally forked from django.dispatch
Copyright (c) Django Software Foundation and individual contributors.
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of Django nor the names of its contributors may be used
to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
django.dispatch was originally forked from PyDispatcher.
PyDispatcher License:
Copyright (c) 2001-2003, Patrick K. O'Brien and Contributors
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials
provided with the distribution.
The name of Patrick K. O'Brien, or the name of any Contributor,
may not be used to endorse or promote products derived from this
software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
OF THE POSSIBILITY OF SUCH DAMAGE.
src/sugar3/dispatch/saferef.py
+250
View File
@@ -0,0 +1,250 @@
"""
"Safe weakrefs", originally from pyDispatcher.
Provides a way to safely weakref any function, including bound methods (which
aren't handled by the core weakref module).
"""
import weakref, traceback
def safeRef(target, onDelete = None):
"""Return a *safe* weak reference to a callable target
target -- the object to be weakly referenced, if it's a
bound method reference, will create a BoundMethodWeakref,
otherwise creates a simple weakref.
onDelete -- if provided, will have a hard reference stored
to the callable to be called after the safe reference
goes out of scope with the reference object, (either a
weakref or a BoundMethodWeakref) as argument.
"""
if hasattr(target, 'im_self'):
if target.im_self is not None:
# Turn a bound method into a BoundMethodWeakref instance.
# Keep track of these instances for lookup by disconnect().
assert hasattr(target, 'im_func'), """safeRef target %r has im_self, but no im_func, don't know how to create reference"""%( target,)
reference = get_bound_method_weakref(
target=target,
onDelete=onDelete
)
return reference
if callable(onDelete):
return weakref.ref(target, onDelete)
else:
return weakref.ref( target )
class BoundMethodWeakref(object):
"""'Safe' and reusable weak references to instance methods
BoundMethodWeakref objects provide a mechanism for
referencing a bound method without requiring that the
method object itself (which is normally a transient
object) is kept alive. Instead, the BoundMethodWeakref
object keeps weak references to both the object and the
function which together define the instance method.
Attributes:
key -- the identity key for the reference, calculated
by the class's calculateKey method applied to the
target instance method
deletionMethods -- sequence of callable objects taking
single argument, a reference to this object which
will be called when *either* the target object or
target function is garbage collected (i.e. when
this object becomes invalid). These are specified
as the onDelete parameters of safeRef calls.
weakSelf -- weak reference to the target object
weakFunc -- weak reference to the target function
Class Attributes:
_allInstances -- class attribute pointing to all live
BoundMethodWeakref objects indexed by the class's
calculateKey(target) method applied to the target
objects. This weak value dictionary is used to
short-circuit creation so that multiple references
to the same (object, function) pair produce the
same BoundMethodWeakref instance.
"""
_allInstances = weakref.WeakValueDictionary()
def __new__( cls, target, onDelete=None, *arguments,**named ):
"""Create new instance or return current instance
Basically this method of construction allows us to
short-circuit creation of references to already-
referenced instance methods. The key corresponding
to the target is calculated, and if there is already
an existing reference, that is returned, with its
deletionMethods attribute updated. Otherwise the
new instance is created and registered in the table
of already-referenced methods.
"""
key = cls.calculateKey(target)
current =cls._allInstances.get(key)
if current is not None:
current.deletionMethods.append( onDelete)
return current
else:
base = super( BoundMethodWeakref, cls).__new__( cls )
cls._allInstances[key] = base
base.__init__( target, onDelete, *arguments,**named)
return base
def __init__(self, target, onDelete=None):
"""Return a weak-reference-like instance for a bound method
target -- the instance-method target for the weak
reference, must have im_self and im_func attributes
and be reconstructable via:
target.im_func.__get__( target.im_self )
which is true of built-in instance methods.
onDelete -- optional callback which will be called
when this weak reference ceases to be valid
(i.e. either the object or the function is garbage
collected). Should take a single argument,
which will be passed a pointer to this object.
"""
def remove(weak, self=self):
"""Set self.isDead to true when method or instance is destroyed"""
methods = self.deletionMethods[:]
del self.deletionMethods[:]
try:
del self.__class__._allInstances[ self.key ]
except KeyError:
pass
for function in methods:
try:
if callable( function ):
function( self )
except Exception, e:
try:
traceback.print_exc()
except AttributeError, err:
print '''Exception during saferef %s cleanup function %s: %s'''%(
self, function, e
)
self.deletionMethods = [onDelete]
self.key = self.calculateKey( target )
self.weakSelf = weakref.ref(target.im_self, remove)
self.weakFunc = weakref.ref(target.im_func, remove)
self.selfName = str(target.im_self)
self.funcName = str(target.im_func.__name__)
def calculateKey( cls, target ):
"""Calculate the reference key for this reference
Currently this is a two-tuple of the id()'s of the
target object and the target function respectively.
"""
return (id(target.im_self),id(target.im_func))
calculateKey = classmethod( calculateKey )
def __str__(self):
"""Give a friendly representation of the object"""
return """%s( %s.%s )"""%(
self.__class__.__name__,
self.selfName,
self.funcName,
)
__repr__ = __str__
def __nonzero__( self ):
"""Whether we are still a valid reference"""
return self() is not None
def __cmp__( self, other ):
"""Compare with another reference"""
if not isinstance (other,self.__class__):
return cmp( self.__class__, type(other) )
return cmp( self.key, other.key)
def __call__(self):
"""Return a strong reference to the bound method
If the target cannot be retrieved, then will
return None, otherwise returns a bound instance
method for our object and function.
Note:
You may call this method any number of times,
as it does not invalidate the reference.
"""
target = self.weakSelf()
if target is not None:
function = self.weakFunc()
if function is not None:
return function.__get__(target)
return None
class BoundNonDescriptorMethodWeakref(BoundMethodWeakref):
"""A specialized BoundMethodWeakref, for platforms where instance methods
are not descriptors.
It assumes that the function name and the target attribute name are the
same, instead of assuming that the function is a descriptor. This approach
is equally fast, but not 100% reliable because functions can be stored on an
attribute named differenty than the function's name such as in:
class A: pass
def foo(self): return "foo"
A.bar = foo
But this shouldn't be a common use case. So, on platforms where methods
aren't descriptors (such as Jython) this implementation has the advantage
of working in the most cases.
"""
def __init__(self, target, onDelete=None):
"""Return a weak-reference-like instance for a bound method
target -- the instance-method target for the weak
reference, must have im_self and im_func attributes
and be reconstructable via:
target.im_func.__get__( target.im_self )
which is true of built-in instance methods.
onDelete -- optional callback which will be called
when this weak reference ceases to be valid
(i.e. either the object or the function is garbage
collected). Should take a single argument,
which will be passed a pointer to this object.
"""
assert getattr(target.im_self, target.__name__) == target, \
("method %s isn't available as the attribute %s of %s" %
(target, target.__name__, target.im_self))
super(BoundNonDescriptorMethodWeakref, self).__init__(target, onDelete)
def __call__(self):
"""Return a strong reference to the bound method
If the target cannot be retrieved, then will
return None, otherwise returns a bound instance
method for our object and function.
Note:
You may call this method any number of times,
as it does not invalidate the reference.
"""
target = self.weakSelf()
if target is not None:
function = self.weakFunc()
if function is not None:
# Using curry() would be another option, but it erases the
# "signature" of the function. That is, after a function is
# curried, the inspect module can't be used to determine how
# many arguments the function expects, nor what keyword
# arguments it supports, and pydispatcher needs this
# information.
return getattr(target, function.__name__)
return None
def get_bound_method_weakref(target, onDelete):
"""Instantiates the appropiate BoundMethodWeakRef, depending on the details of
the underlying class method implementation"""
if hasattr(target, '__get__'):
# target method is a descriptor, so the default implementation works:
return BoundMethodWeakref(target=target, onDelete=onDelete)
else:
# no luck, use the alternative implementation:
return BoundNonDescriptorMethodWeakref(target=target, onDelete=onDelete)