name : charsetgroupprober.py ######################## 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 typing import List, Optional, Union from .charsetprober import CharSetProber from .enums import LanguageFilter, ProbingState class CharSetGroupProber(CharSetProber): def __init__(self, lang_filter: LanguageFilter = LanguageFilter.NONE) -> None: super().__init__(lang_filter=lang_filter) self._active_num = 0 self.probers: List[CharSetProber] = [] self._best_guess_prober: Optional[CharSetProber] = None def reset(self) -> None: super().reset() self._active_num = 0 for prober in self.probers: prober.reset() prober.active = True self._active_num += 1 self._best_guess_prober = None @property def charset_name(self) -> Optional[str]: 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) -> Optional[str]: if not self._best_guess_prober: self.get_confidence() if not self._best_guess_prober: return None return self._best_guess_prober.language def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState: for prober in self.probers: 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 if 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 def get_confidence(self) -> float: state = self.state if state == ProbingState.FOUND_IT: return 0.99 if state == ProbingState.NOT_ME: return 0.01 best_conf = 0.0 self._best_guess_prober = None for prober in self.probers: 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