Source code for chardet.charsetgroupprober

######################## BEGIN LICENSE BLOCK ########################
# The Original Code is Mozilla Communicator client 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


[docs]class CharSetGroupProber(CharSetProber): def __init__(self, lang_filter=None): super().__init__(lang_filter=lang_filter) self._active_num = 0 self.probers = [] self._best_guess_prober = None
[docs] def reset(self): super().reset() self._active_num = 0 for prober in self.probers: if prober: prober.reset() prober.active = True self._active_num += 1 self._best_guess_prober = None
@property def charset_name(self): if not self._best_guess_prober: self.get_confidence() if not self._best_guess_prober: return None return self._best_guess_prober.charset_name @property def language(self): if not self._best_guess_prober: self.get_confidence() if not self._best_guess_prober: return None return self._best_guess_prober.language
[docs] def feed(self, byte_str): for prober in self.probers: if not prober: continue if not prober.active: continue state = prober.feed(byte_str) if not state: continue if state == ProbingState.FOUND_IT: self._best_guess_prober = prober self._state = ProbingState.FOUND_IT return self.state elif state == ProbingState.NOT_ME: prober.active = False self._active_num -= 1 if self._active_num <= 0: self._state = ProbingState.NOT_ME return self.state return self.state
[docs] def get_confidence(self): state = self.state if state == ProbingState.FOUND_IT: return 0.99 elif state == ProbingState.NOT_ME: return 0.01 best_conf = 0.0 self._best_guess_prober = None for prober in self.probers: if not prober: continue if not prober.active: self.logger.debug("%s not active", prober.charset_name) continue conf = prober.get_confidence() self.logger.debug( "%s %s confidence = %s", prober.charset_name, prober.language, conf ) if best_conf < conf: best_conf = conf self._best_guess_prober = prober if not self._best_guess_prober: return 0.0 return best_conf