File: //lib/python3/dist-packages/twisted/spread/__pycache__/jelly.cpython-38.pyc
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S-expression-based persistence of python objects.
It does something very much like L{Pickle<pickle>}; however, pickle's main goal
seems to be efficiency (both in space and time); jelly's main goals are
security, human readability, and portability to other environments.
This is how Jelly converts various objects to s-expressions.
Boolean::
True --> ['boolean', 'true']
Integer::
1 --> 1
List::
[1, 2] --> ['list', 1, 2]
String::
"hello" --> "hello"
Float::
2.3 --> 2.3
Dictionary::
{'a': 1, 'b': 'c'} --> ['dictionary', ['b', 'c'], ['a', 1]]
Module::
UserString --> ['module', 'UserString']
Class::
UserString.UserString --> ['class', ['module', 'UserString'], 'UserString']
Function::
string.join --> ['function', 'join', ['module', 'string']]
Instance: s is an instance of UserString.UserString, with a __dict__
{'data': 'hello'}::
["UserString.UserString", ['dictionary', ['data', 'hello']]]
Class Method: UserString.UserString.center::
['method', 'center', ['None'], ['class', ['module', 'UserString'],
'UserString']]
Instance Method: s.center, where s is an instance of UserString.UserString::
['method', 'center', ['instance', ['reference', 1, ['class',
['module', 'UserString'], 'UserString']], ['dictionary', ['data', 'd']]],
['dereference', 1]]
The C{set} builtin and the C{sets.Set} class are serialized to the same
thing, and unserialized to C{set} if available, else to C{sets.Set}. It means
that there's a possibility of type switching in the serialization process. The
solution is to always use C{set}.
The same rule applies for C{frozenset} and C{sets.ImmutableSet}.
@author: Glyph Lefkowitz
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Call this at the module level immediately after its class
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the classname, pass the empty string ''.
@param module: a module object from which to pull the Copied classes.
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reference is NOT circular), the copy-in-place of aList is relevant,
since the list being modified is the actual, pre-existing jelly
expression that was returned for that object. If not, it's technically
superfluous, since the value in self.preserved didn't need to be set,
but the invariant that self.preserved[id(object)] is a list is
convenient because that means we don't have to test and create it or
not create it here, creating fewer code-paths. that's why
self.preserved is always set to a list.
Sorry that this code is so hard to follow, but Python objects are
tricky to persist correctly. -glyph
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