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utf8prober.py

######################## 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

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	0/0	0755	2022-11-28 09:49:25
..	dir	-	0/0	0755	2026-04-28 05:55:45
__pycache__	dir	-	0/0	0755	2022-11-28 09:49:25
cli	dir	-	0/0	0755	2022-11-28 09:49:25
__init__.py	text/x-script.python	1.52 KB	0/0	0644	2017-04-12 06:41:25
big5freq.py	text/plain	30.52 KB	0/0	0644	2017-04-11 05:51:33
big5prober.py	text/x-script.python	1.72 KB	0/0	0644	2017-04-11 05:51:33
chardistribution.py	text/x-script.python	9.19 KB	0/0	0644	2017-04-11 07:52:09
charsetgroupprober.py	text/x-script.python	3.7 KB	0/0	0644	2017-04-11 05:51:33
charsetprober.py	text/x-script.python	4.99 KB	0/0	0644	2017-06-08 02:21:53
codingstatemachine.py	text/x-script.python	3.51 KB	0/0	0644	2017-04-11 05:51:33
compat.py	text/plain	1.11 KB	0/0	0644	2017-06-08 02:32:38
cp949prober.py	text/x-script.python	1.81 KB	0/0	0644	2017-04-11 05:51:33
enums.py	text/plain	1.62 KB	0/0	0644	2017-04-11 05:51:33
escprober.py	text/x-script.python	3.86 KB	0/0	0644	2017-04-11 05:51:33
escsm.py	text/x-script.python	10.26 KB	0/0	0644	2017-04-11 05:51:33
eucjpprober.py	text/x-script.python	3.66 KB	0/0	0644	2017-04-11 05:51:33
euckrfreq.py	text/plain	13.23 KB	0/0	0644	2017-04-11 05:51:33
euckrprober.py	text/x-script.python	1.71 KB	0/0	0644	2017-04-11 05:51:33
euctwfreq.py	text/plain	30.88 KB	0/0	0644	2017-04-11 08:48:55
euctwprober.py	text/x-script.python	1.71 KB	0/0	0644	2017-04-11 05:51:33
gb2312freq.py	text/plain	20.23 KB	0/0	0644	2017-04-11 05:51:33
gb2312prober.py	text/x-script.python	1.71 KB	0/0	0644	2017-04-11 05:51:33
hebrewprober.py	text/x-script.python	13.51 KB	0/0	0644	2017-06-08 02:21:53
jisfreq.py	text/plain	25.17 KB	0/0	0644	2017-04-11 05:51:33
jpcntx.py	text/plain	19.18 KB	0/0	0644	2017-04-11 05:51:33
langbulgarianmodel.py	text/plain	12.54 KB	0/0	0644	2017-06-08 02:32:38
langcyrillicmodel.py	text/plain	17.53 KB	0/0	0644	2017-06-08 02:32:38
langgreekmodel.py	text/plain	12.39 KB	0/0	0644	2017-06-08 02:32:38
langhebrewmodel.py	text/plain	11.08 KB	0/0	0644	2017-06-08 02:32:38
langhungarianmodel.py	text/plain	12.3 KB	0/0	0644	2017-06-08 02:32:38
langthaimodel.py	text/plain	11.03 KB	0/0	0644	2017-06-08 02:32:38
langturkishmodel.py	text/plain	10.84 KB	0/0	0644	2017-06-08 02:32:38
latin1prober.py	text/x-script.python	5.24 KB	0/0	0644	2017-06-08 02:21:53
mbcharsetprober.py	text/x-script.python	3.33 KB	0/0	0644	2017-04-11 05:51:33
mbcsgroupprober.py	text/x-script.python	1.96 KB	0/0	0644	2017-04-11 05:51:33
mbcssm.py	text/x-script.python	24.88 KB	0/0	0644	2017-04-11 05:51:33
sbcharsetprober.py	text/x-script.python	5.52 KB	0/0	0644	2017-06-08 02:32:38
sbcsgroupprober.py	text/x-script.python	3.46 KB	0/0	0644	2017-06-08 02:32:38
sjisprober.py	text/x-script.python	3.69 KB	0/0	0644	2017-04-11 05:51:33
universaldetector.py	text/x-script.python	12.19 KB	0/0	0644	2017-06-08 02:32:38
utf8prober.py	text/x-script.python	2.7 KB	0/0	0644	2017-04-11 05:51:33
version.py	text/plain	242 B	0/0	0644	2017-06-08 02:32:13

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