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# sharedobjects.py, classes to aid activities in sharing a state
# Reinier Heeres, reinier@heeres.eu
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# Change log:
# 2007-06-21: rwh, first version
import types
import difflib
import logging
_logger = logging.getLogger('sharinghelper')
from sharedobject import SharedObject
def my_joinlines(list, addsep=False, separator='\n'):
if len(list) == 0:
return ''
string = list[0]
for s in list[1:]:
if addsep:
string += separator
string += s
return string
def my_splitlines(str, keepsep=False, separators=['\n']):
list = []
if str is None:
return list
ofs = 0
startofs = 0
while ofs < len(str):
if str[ofs] in separators:
if keepsep:
list.append(str[startofs:ofs+1])
else:
if startofs != ofs:
list.append(str[startofs:ofs])
else:
list.append('')
startofs = ofs + 1
ofs += 1
return list
def string_to_list(str):
list = []
if str is not None:
for i in str:
list.append(i)
return list
def list_to_string(l):
str = ""
for i in l:
str += i
return str
class SharedText(SharedObject):
"""Shared text object, generates line-by-line difference objects"""
REPLACE = 0
DELETE = 1
INSERT = 2
BY_CHAR = 0
BY_WORD = 1
BY_LINE = 2
def __init__(self, name, helper, opt={}, by_what=BY_CHAR):
SharedObject.__init__(self, name, helper, opt=opt)
self._value = ''
self._by_what = by_what
def split(self, s):
if self._by_what == SharedText.BY_CHAR:
return string_to_list(s)
elif self._by_what == SharedText.BY_WORD:
return my_splitlines(s, keepsep=True, separators=['\n', ' '])
elif self._by_what == SharedText.BY_LINE:
return my_splitlines(s, keepsep=True)
else:
_logger.error('SharedText.split(): unknown splitting type')
def join(self, l):
if self._by_what == SharedText.BY_CHAR:
return list_to_string(l)
elif self._by_what == SharedText.BY_WORD:
return my_joinlines(l)
elif self._by_what == SharedText.BY_LINE:
return my_joinlines(l)
else:
_logger.error('SharedText.split(): unknown splitting type')
def _compatible_diffs(self, da, db):
return True
def diff(self, cur, old):
"""Generate a difference object between to text objects"""
_logger.debug('Generating diff between %r and %r', cur, old)
l1 = self.split(cur)
l2 = self.split(old)
sm = difflib.SequenceMatcher(None, l2, l1)
ret = []
for (tag, i1, i2, j1, j2) in sm.get_opcodes():
if tag is 'replace':
ret.append((SharedText.REPLACE, (i1, i2, j1, j2), l1[j1:j2]))
elif tag is 'delete':
ret.append((SharedText.DELETE, (i1, i2, j1, j2), None))
elif tag is 'insert':
ret.append((SharedText.INSERT, (i1, i2, j1, j2), l1[j1:j2]))
elif tag is 'equal':
pass
else:
_logger.warning('SharedText.diff(): unkown tag: %s', tag)
if len(ret) is 0:
return None
else:
return ret
def _apply_diff_to(self, obj, diffobj):
"""Apply a diff and return an object that describes the inverse diff"""
if diffobj is None:
_logger.error('SharedText.apply_diff_to(): no diffobj given')
return (None, None)
_logger.debug('Applying %r to %r', diffobj, obj)
ret = []
d = 0
l2 = self.split(obj)
for (tag, (i1, i2, j1, j2), val) in diffobj:
i1 -= d
i2 -= d
# print 'd: %r' % (d)
if tag is SharedText.REPLACE:
ret.append((SharedText.REPLACE, (j1, j2, i1, i2), l2[i1:i2]))
l2[i1:i2] = val
d -= (j2 - j1) - (i2 - i1)
elif tag is SharedText.DELETE:
ret.append((SharedText.INSERT, (j1, j2, i1, i2), l2[i1:i2]))
del(l2[i1:i2])
d += i2 - i1
elif tag is SharedText.INSERT:
ret.append((SharedText.DELETE, (j1, j2, i1, i2), None))
l2[i1:i1] = val
d -= j2 - j1
obj = self.join(l2)
return (obj, ret)
def insert(self, ofs, str):
self._value = self._value[:ofs] + str + self._value[ofs:]
dobj = {"type": 'chars', "data": (SharedText.INSERT, ofs, str)}
self.changed(dobj, True)
def remove(self, ofs, len):
del self._value[ofs:ofs+len]
dobj = {"type": 'chars', "data": (SharedText.REMOVE, ofs, len)}
self.changed(dobj, True)
def replace(self, ofs, str):
self._value[ofs:ofs+len(str)] = str
dobj = {"type": 'chars', "data": (SharedText.REPLACE, ofs, str)}
self.changed(dobj, True)
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