mirror of
https://github.com/microsoft/PowerToys.git
synced 2024-12-17 04:58:04 +08:00
77 lines
2.6 KiB
Python
77 lines
2.6 KiB
Python
|
######################## BEGIN LICENSE BLOCK ########################
|
||
|
|
# The Original Code is mozilla.org code.
|
||
|
|
#
|
||
|
|
# The Initial Developer of the Original Code is
|
||
|
|
# Netscape Communications Corporation.
|
||
|
|
# Portions created by the Initial Developer are Copyright (C) 1998
|
||
|
|
# the Initial Developer. All Rights Reserved.
|
||
|
|
#
|
||
|
|
# Contributor(s):
|
||
|
|
# Mark Pilgrim - port to Python
|
||
|
|
#
|
||
|
|
# This library is free software; you can redistribute it and/or
|
||
|
|
# modify it under the terms of the GNU Lesser General Public
|
||
|
|
# License as published by the Free Software Foundation; either
|
||
|
|
# version 2.1 of the License, or (at your option) any later version.
|
||
|
|
#
|
||
|
|
# This library 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
|
||
|
|
# Lesser General Public License for more details.
|
||
|
|
#
|
||
|
|
# You should have received a copy of the GNU Lesser General Public
|
||
|
|
# License along with this library; if not, write to the Free Software
|
||
|
|
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
|
||
|
|
# 02110-1301 USA
|
||
|
|
######################### END LICENSE BLOCK #########################
|
||
|
|
|
||
|
|
from . import constants
|
||
|
|
from .charsetprober import CharSetProber
|
||
|
|
from .codingstatemachine import CodingStateMachine
|
||
|
|
from .mbcssm import UTF8SMModel
|
||
|
|
|
||
|
|
ONE_CHAR_PROB = 0.5
|
||
|
|
|
||
|
|
|
||
|
|
class UTF8Prober(CharSetProber):
|
||
|
|
def __init__(self):
|
||
|
|
CharSetProber.__init__(self)
|
||
|
|
self._mCodingSM = CodingStateMachine(UTF8SMModel)
|
||
|
|
self.reset()
|
||
|
|
|
||
|
|
def reset(self):
|
||
|
|
CharSetProber.reset(self)
|
||
|
|
self._mCodingSM.reset()
|
||
|
|
self._mNumOfMBChar = 0
|
||
|
|
|
||
|
|
def get_charset_name(self):
|
||
|
|
return "utf-8"
|
||
|
|
|
||
|
|
def feed(self, aBuf):
|
||
|
|
for c in aBuf:
|
||
|
|
codingState = self._mCodingSM.next_state(c)
|
||
|
|
if codingState == constants.eError:
|
||
|
|
self._mState = constants.eNotMe
|
||
|
|
break
|
||
|
|
elif codingState == constants.eItsMe:
|
||
|
|
self._mState = constants.eFoundIt
|
||
|
|
break
|
||
|
|
elif codingState == constants.eStart:
|
||
|
|
if self._mCodingSM.get_current_charlen() >= 2:
|
||
|
|
self._mNumOfMBChar += 1
|
||
|
|
|
||
|
|
if self.get_state() == constants.eDetecting:
|
||
|
|
if self.get_confidence() > constants.SHORTCUT_THRESHOLD:
|
||
|
|
self._mState = constants.eFoundIt
|
||
|
|
|
||
|
|
return self.get_state()
|
||
|
|
|
||
|
|
def get_confidence(self):
|
||
|
|
unlike = 0.99
|
||
|
|
if self._mNumOfMBChar < 6:
|
||
|
|
for i in range(0, self._mNumOfMBChar):
|
||
|
|
unlike = unlike * ONE_CHAR_PROB
|
||
|
|
return 1.0 - unlike
|
||
|
|
else:
|
||
|
|
return unlike
|