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# Iterator over frames.
# Copyright (C) 2008, 2009 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
class FrameIterator:
"""An iterator that iterates over frames."""
def __init__ (self, frame):
"Initialize a FrameIterator. FRAME is the starting frame."
self.frame = frame
def __iter__ (self):
return self
def next (self):
result = self.frame
if result is None:
raise StopIteration
self.frame = result.older ()
return result