mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-14 11:08:15 +01:00
83 lines
2.7 KiB
Python
83 lines
2.7 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 .charsetprober import CharSetProber
|
||
|
|
from .enums import ProbingState, MachineState
|
||
|
|
from .codingstatemachine import CodingStateMachine
|
||
|
|
from .mbcssm import UTF8_SM_MODEL
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
class UTF8Prober(CharSetProber):
|
||
|
|
ONE_CHAR_PROB = 0.5
|
||
|
|
|
||
|
|
def __init__(self):
|
||
|
|
super(UTF8Prober, self).__init__()
|
||
|
|
self.coding_sm = CodingStateMachine(UTF8_SM_MODEL)
|
||
|
|
self._num_mb_chars = None
|
||
|
|
self.reset()
|
||
|
|
|
||
|
|
def reset(self):
|
||
|
|
super(UTF8Prober, self).reset()
|
||
|
|
self.coding_sm.reset()
|
||
|
|
self._num_mb_chars = 0
|
||
|
|
|
||
|
|
@property
|
||
|
|
def charset_name(self):
|
||
|
|
return "utf-8"
|
||
|
|
|
||
|
|
@property
|
||
|
|
def language(self):
|
||
|
|
return ""
|
||
|
|
|
||
|
|
def feed(self, byte_str):
|
||
|
|
for c in byte_str:
|
||
|
|
coding_state = self.coding_sm.next_state(c)
|
||
|
|
if coding_state == MachineState.ERROR:
|
||
|
|
self._state = ProbingState.NOT_ME
|
||
|
|
break
|
||
|
|
elif coding_state == MachineState.ITS_ME:
|
||
|
|
self._state = ProbingState.FOUND_IT
|
||
|
|
break
|
||
|
|
elif coding_state == MachineState.START:
|
||
|
|
if self.coding_sm.get_current_charlen() >= 2:
|
||
|
|
self._num_mb_chars += 1
|
||
|
|
|
||
|
|
if self.state == ProbingState.DETECTING:
|
||
|
|
if self.get_confidence() > self.SHORTCUT_THRESHOLD:
|
||
|
|
self._state = ProbingState.FOUND_IT
|
||
|
|
|
||
|
|
return self.state
|
||
|
|
|
||
|
|
def get_confidence(self):
|
||
|
|
unlike = 0.99
|
||
|
|
if self._num_mb_chars < 6:
|
||
|
|
unlike *= self.ONE_CHAR_PROB ** self._num_mb_chars
|
||
|
|
return 1.0 - unlike
|
||
|
|
else:
|
||
|
|
return unlike
|