REDROOM

Navigation

Breadcrumbs

Create

Preview: utf8prober.py Size: 2.70 KB

//lib/python3.6/site-packages/chardet/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	Size	Perms	Modified	Actions
cli DIR	-	drwxr-xr-x	2025-03-30 04:21:31	Edit Download recursive recursive
__pycache__ DIR	-	drwxr-xr-x	2025-03-30 04:21:31	Edit Download recursive recursive
big5freq.py	30.52 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
big5prober.py	1.72 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
chardistribution.py	9.19 KB	lrw-r--r--	2017-04-11 19:52:09	Edit Download recursive recursive
charsetgroupprober.py	3.70 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
charsetprober.py	4.99 KB	lrw-r--r--	2017-06-08 14:21:53	Edit Download recursive recursive
codingstatemachine.py	3.51 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
compat.py	1.11 KB	lrw-r--r--	2017-06-08 14:32:38	Edit Download recursive recursive
cp949prober.py	1.81 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
enums.py	1.62 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
escprober.py	3.86 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
escsm.py	10.26 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
eucjpprober.py	3.66 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
euckrfreq.py	13.23 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
euckrprober.py	1.71 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
euctwfreq.py	30.88 KB	lrw-r--r--	2017-04-11 20:48:55	Edit Download recursive recursive
euctwprober.py	1.71 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
gb2312freq.py	20.23 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
gb2312prober.py	1.71 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
hebrewprober.py	13.51 KB	lrw-r--r--	2017-06-08 14:21:53	Edit Download recursive recursive
jisfreq.py	25.17 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
jpcntx.py	19.18 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
langbulgarianmodel.py	12.54 KB	lrw-r--r--	2017-06-08 14:32:38	Edit Download recursive recursive
langcyrillicmodel.py	17.53 KB	lrw-r--r--	2017-06-08 14:32:38	Edit Download recursive recursive
langgreekmodel.py	12.39 KB	lrw-r--r--	2017-06-08 14:32:38	Edit Download recursive recursive
langhebrewmodel.py	11.08 KB	lrw-r--r--	2017-06-08 14:32:38	Edit Download recursive recursive
langhungarianmodel.py	12.30 KB	lrw-r--r--	2017-06-08 14:32:38	Edit Download recursive recursive
langthaimodel.py	11.03 KB	lrw-r--r--	2017-06-08 14:32:38	Edit Download recursive recursive
langturkishmodel.py	10.84 KB	lrw-r--r--	2017-06-08 14:32:38	Edit Download recursive recursive
latin1prober.py	5.24 KB	lrw-r--r--	2017-06-08 14:21:53	Edit Download recursive recursive
mbcharsetprober.py	3.33 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
mbcsgroupprober.py	1.96 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
mbcssm.py	24.88 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
sbcharsetprober.py	5.52 KB	lrw-r--r--	2017-06-08 14:32:38	Edit Download recursive recursive
sbcsgroupprober.py	3.46 KB	lrw-r--r--	2017-06-08 14:32:38	Edit Download recursive recursive
sjisprober.py	3.69 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
universaldetector.py	12.19 KB	lrw-r--r--	2017-06-08 14:32:38	Edit Download recursive recursive
utf8prober.py	2.70 KB	lrw-r--r--	2017-04-11 17:51:33	Edit Download recursive recursive
version.py	242 B	lrw-r--r--	2017-06-08 14:32:13	Edit Download recursive recursive
__init__.py	1.52 KB	lrw-r--r--	2017-04-12 18:41:25	Edit Download recursive recursive

Directory Contents