''' essentially, specialized pickle for this app:
:Author: Aaron Watters
:Maintainers: http://gadfly.sf.net/
:Copyright: Aaron Robert Watters, 1994
:Id: $Id: serialize.py,v 1.4 2002/05/11 02:59:05 richard Exp $:
'''
# TODO need to fix serialization/deserialization of btand and btor
import types
def serialize(ob):
""" Simple protocol for generating a marshallable ob
TODO: I'm worried that tuples are special cases here...
"""
if not isinstance(ob, types.InstanceType):
# base type
return ob
args1 = ob.initargs()
args1 = tuple(map(serialize, args1))
args2 = ob.marshaldata()
return (ob.__class__.__name__, (args1, args2))
def deserialize(description):
""" Dual of serialize
"""
# base type
if not isinstance(description, types.TupleType) or len(description) != 2:
return description
# pull out the class name and marshal data
(name, desc) = description
# TODO: these doesn't actually appear to be possible
if name == "tuple":
# tuple case
return desc
if name == "list":
# list case: map deserialize across desc
return map(deserialize, desc)
# all other cases are classes of semantics
import semantics
klass = getattr(semantics, name)
(args1, args2) = desc
args1 = tuple(map(deserialize, args1))
ob = apply(klass, args1)
ob.demarshal(args2)
return ob
# invariant:
# deserialize(serialize(ob)) returns semantic copy of ob
# serialize(ob) is marshallable
# ie,
# args1 = ob.initargs() # init args
# args1d = map(serialize, args1) # serialized
# args2 = ob.marshaldata() # marshalable addl info
# # assert args1d, args2 are marshallable
# args1copy = map(deserialize, args1)
# ob2 = ob.__class__(args1copy)
# ob2 = ob2.demarshal(args2)
# # assert ob2 is semantic copy of ob
#
# $Log: serialize.py,v $
# Revision 1.4 2002/05/11 02:59:05 richard
# Added info into module docstrings.
# Fixed docco of kwParsing to reflect new grammar "marshalling".
# Fixed bug in gadfly.open - most likely introduced during sql loading
# re-work (though looking back at the diff from back then, I can't see how it
# wasn't different before, but it musta been ;)
# A buncha new unit test stuff.
#
#
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