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Added alt unpickler hack for backward compatibility with saves.

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This commit is contained in:
Joe R 2023-02-24 20:51:35 -05:00
parent 0a10c72524
commit a306f65424
1 changed files with 25 additions and 3 deletions
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28
pysollib/game/__init__.py
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@ -267,6 +267,26 @@ def _highlightCards__calc_item(canvas, delta, cw, ch, s, c1, c2, color):
return r
class random_dummy:
seed = {}
# the _alt_unpickler is an unpickler that contains a few hacks
# to ensure backward compatibility of saves.
class _alt_unpickler(Unpickler):
version = 0
def set_version(self, version_tuple):
if version_tuple < (2, 20, 0):
self.version = 1
def find_class(self, module, name):
if self.version == 1 and module == 'pysol_cards.random':
return random_dummy
else:
return super().find_class(module, name)
@attr.s
class StackGroups(NewStruct):
dropstacks = attr.ib(factory=list)
@ -906,7 +926,7 @@ class Game(object):
def restoreGameFromBookmark(self, bookmark):
old_busy, self.busy = self.busy, 1
file = BytesIO(bookmark)
p = Unpickler(file)
p = _alt_unpickler(file)
game = self._undumpGame(p, self.app)
assert game.id == self.id
self.restoreGame(game, reset=0)
@ -3168,7 +3188,7 @@ class Game(object):
s, moves_index = bm
self.setCursor(cursor=CURSOR_WATCH)
file = BytesIO(s)
p = Unpickler(file)
p = _alt_unpickler(file)
game = self._undumpGame(p, self.app)
assert game.id == self.id
# save state for undoGotoBookmark
@ -3257,8 +3277,9 @@ class Game(object):
def _loadGame(self, filename, app):
game = None
with open(filename, "rb") as f:
game = self._undumpGame(Unpickler(f), app)
game = self._undumpGame(_alt_unpickler(f), app)
game.gstats.loaded += 1
return game
def _undumpGame(self, p, app):
@ -3292,6 +3313,7 @@ class Game(object):
_('Cannot load games saved with\n%(app)s version %(ver)s') % {
'app': PACKAGE,
'ver': version})
p.set_version(version_tuple)
game_version = 1
bookmark = pload(int)
validate(0 <= bookmark <= 2, err_txt)