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# Copyright (C) 2009, 2010, 2011 Roman Zimbelmann <romanz@lavabit.com>
# This software is distributed under the terms of the GNU GPL version 3.
# TODO: rewrite to use deque instead of list
class HistoryEmptyException(Exception):
pass
class History(object):
def __init__(self, maxlen=None, unique=True):
if isinstance(maxlen, History):
self._history = list(maxlen._history)
self._index = maxlen._index
self.maxlen = maxlen.maxlen
self.unique = maxlen.unique
else:
self._history = []
self._index = 0
self.maxlen = maxlen
self.unique = unique
def add(self, item):
# Remove everything after index
if self._index < len(self._history) - 2:
del self._history[:self._index+1]
# Remove Duplicates
if self.unique:
try:
self._history.remove(item)
except:
pass
else:
if self._history and self._history[-1] == item:
del self._history[-1]
# Remove first if list is too long
if len(self._history) > self.maxlen - 1:
del self._history[0]
# Append the item and fast forward
self._history.append(item)
self._index = len(self._history) - 1
def modify(self, item, unique=False):
if self._history and unique:
try:
self._history.remove(item)
self._index -= 1
except:
pass
try:
self._history[self._index] = item
except IndexError:
self.add(item)
def rebase(self, other_history):
assert isinstance(other_history, History)
index_offset = len(self._history) - self._index
self._history[:self._index] = list(other_history._history)
if len(self._history) > self.maxlen:
self._history = self._history[-self.maxlen:]
self._index = len(self._history) - index_offset
def __len__(self):
return len(self._history)
def current(self):
if self._history:
return self._history[self._index]
else:
raise HistoryEmptyException
def top(self):
try:
return self._history[-1]
except IndexError:
raise HistoryEmptyException()
def bottom(self):
try:
return self._history[0]
except IndexError:
raise HistoryEmptyException()
def back(self):
self._index -= 1
if self._index < 0:
self._index = 0
return self.current()
def move(self, n):
self._index += n
if self._index > len(self._history) - 1:
self._index = len(self._history) - 1
if self._index < 0:
self._index = 0
return self.current()
def search(self, string, n):
if n != 0 and string:
step = n > 0 and 1 or -1
i = self._index
steps_left = steps_left_at_start = int(abs(n))
while steps_left:
i += step
if i >= len(self._history) or i < 0:
break
if self._history[i].startswith(string):
steps_left -= 1
if steps_left != steps_left_at_start:
self._index = i
return self.current()
def __iter__(self):
return self._history.__iter__()
def next(self):
return self._history.next()
def forward(self):
if self._history:
self._index += 1
if self._index > len(self._history) - 1:
self._index = len(self._history) - 1
else:
self._index = 0
return self.current()
def fast_forward(self):
if self._history:
self._index = len(self._history) - 1
else:
self._index = 0
def _left(self): # used for unit test
return self._history[0:self._index+1]
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