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//lib/python2.7/site-packages/chardet/charsetprober.py

######################## BEGIN LICENSE BLOCK ########################
# The Original Code is Mozilla Universal charset detector code.
#
# The Initial Developer of the Original Code is
# Netscape Communications Corporation.
# Portions created by the Initial Developer are Copyright (C) 2001
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#   Mark Pilgrim - port to Python
#   Shy Shalom - original C code
#
# 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
import re

class CharSetProber:
    def __init__(self):
        pass

def reset(self):
        self._mState = constants.eDetecting

def get_charset_name(self):
        return None

def feed(self, aBuf):
        pass

def get_state(self):
        return self._mState

def get_confidence(self):
        return 0.0

def filter_high_bit_only(self, aBuf):
        aBuf = re.sub(b'([\x00-\x7F])+', b' ', aBuf)
        return aBuf

def filter_without_english_letters(self, aBuf):
        aBuf = re.sub(b'([A-Za-z])+', b' ', aBuf)
        return aBuf

def filter_with_english_letters(self, aBuf):
        # TODO
        return aBuf