107 lines
3.8 KiB
Python
107 lines
3.8 KiB
Python
######################## BEGIN LICENSE BLOCK ########################
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# The Original Code is Mozilla Communicator client code.
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#
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# The Initial Developer of the Original Code is
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# Netscape Communications Corporation.
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# Portions created by the Initial Developer are Copyright (C) 1998
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# the Initial Developer. All Rights Reserved.
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#
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# Contributor(s):
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# Mark Pilgrim - port to Python
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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# 02110-1301 USA
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######################### END LICENSE BLOCK #########################
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from typing import List, Optional, Union
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from .charsetprober import CharSetProber
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from .enums import LanguageFilter, ProbingState
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class CharSetGroupProber(CharSetProber):
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def __init__(self, lang_filter: LanguageFilter = LanguageFilter.NONE) -> None:
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super().__init__(lang_filter=lang_filter)
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self._active_num = 0
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self.probers: List[CharSetProber] = []
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self._best_guess_prober: Optional[CharSetProber] = None
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def reset(self) -> None:
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super().reset()
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self._active_num = 0
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for prober in self.probers:
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prober.reset()
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prober.active = True
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self._active_num += 1
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self._best_guess_prober = None
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@property
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def charset_name(self) -> Optional[str]:
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if not self._best_guess_prober:
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self.get_confidence()
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if not self._best_guess_prober:
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return None
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return self._best_guess_prober.charset_name
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@property
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def language(self) -> Optional[str]:
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if not self._best_guess_prober:
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self.get_confidence()
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if not self._best_guess_prober:
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return None
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return self._best_guess_prober.language
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def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
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for prober in self.probers:
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if not prober.active:
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continue
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state = prober.feed(byte_str)
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if not state:
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continue
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if state == ProbingState.FOUND_IT:
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self._best_guess_prober = prober
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self._state = ProbingState.FOUND_IT
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return self.state
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if state == ProbingState.NOT_ME:
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prober.active = False
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self._active_num -= 1
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if self._active_num <= 0:
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self._state = ProbingState.NOT_ME
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return self.state
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return self.state
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def get_confidence(self) -> float:
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state = self.state
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if state == ProbingState.FOUND_IT:
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return 0.99
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if state == ProbingState.NOT_ME:
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return 0.01
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best_conf = 0.0
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self._best_guess_prober = None
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for prober in self.probers:
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if not prober.active:
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self.logger.debug("%s not active", prober.charset_name)
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continue
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conf = prober.get_confidence()
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self.logger.debug(
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"%s %s confidence = %s", prober.charset_name, prober.language, conf
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)
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if best_conf < conf:
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best_conf = conf
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self._best_guess_prober = prober
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if not self._best_guess_prober:
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return 0.0
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return best_conf
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