107 lines
3.8 KiB
Python
107 lines
3.8 KiB
Python
|
######################## 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
|