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Files and Folders in: //usr/lib/python3.8/site-packages/pip/_vendor/chardet

NameTypeSizeLast ModifiedActions
__pycache__ Directory - -
cli Directory - -
__init__.py File 1559 bytes October 17 2023 18:30:24.
big5freq.py File 31254 bytes October 17 2023 18:30:24.
big5prober.py File 1757 bytes October 17 2023 18:30:24.
chardistribution.py File 9411 bytes October 17 2023 18:30:24.
charsetgroupprober.py File 3787 bytes October 17 2023 18:30:24.
charsetprober.py File 5110 bytes October 17 2023 18:30:24.
codingstatemachine.py File 3590 bytes October 17 2023 18:30:24.
compat.py File 1134 bytes October 17 2023 18:30:24.
cp949prober.py File 1855 bytes October 17 2023 18:30:24.
enums.py File 1661 bytes October 17 2023 18:30:24.
escprober.py File 3950 bytes October 17 2023 18:30:24.
escsm.py File 10510 bytes October 17 2023 18:30:24.
eucjpprober.py File 3749 bytes October 17 2023 18:30:24.
euckrfreq.py File 13546 bytes October 17 2023 18:30:24.
euckrprober.py File 1748 bytes October 17 2023 18:30:24.
euctwfreq.py File 31621 bytes October 17 2023 18:30:24.
euctwprober.py File 1747 bytes October 17 2023 18:30:24.
gb2312freq.py File 20715 bytes October 17 2023 18:30:24.
gb2312prober.py File 1754 bytes October 17 2023 18:30:24.
hebrewprober.py File 13838 bytes October 17 2023 18:30:24.
jisfreq.py File 25777 bytes October 17 2023 18:30:24.
jpcntx.py File 19643 bytes October 17 2023 18:30:24.
langbulgarianmodel.py File 12839 bytes October 17 2023 18:30:24.
langcyrillicmodel.py File 17948 bytes October 17 2023 18:30:24.
langgreekmodel.py File 12688 bytes October 17 2023 18:30:24.
langhebrewmodel.py File 11345 bytes October 17 2023 18:30:24.
langhungarianmodel.py File 12592 bytes October 17 2023 18:30:24.
langthaimodel.py File 11290 bytes October 17 2023 18:30:24.
langturkishmodel.py File 11102 bytes October 17 2023 18:30:24.
latin1prober.py File 5370 bytes October 17 2023 18:30:24.
mbcharsetprober.py File 3413 bytes October 17 2023 18:30:24.
mbcsgroupprober.py File 2012 bytes October 17 2023 18:30:24.
mbcssm.py File 25481 bytes October 17 2023 18:30:24.
sbcharsetprober.py File 5657 bytes October 17 2023 18:30:24.
sbcsgroupprober.py File 3546 bytes October 17 2023 18:30:24.
sjisprober.py File 3774 bytes October 17 2023 18:30:24.
universaldetector.py File 12485 bytes October 17 2023 18:30:24.
utf8prober.py File 2766 bytes October 17 2023 18:30:24.
version.py File 242 bytes October 17 2023 18:30:24.

Reading File: //usr/lib/python3.8/site-packages/pip/_vendor/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

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