charsetgroupprober.py

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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_confidenceget_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_confidenceget_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_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_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