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from typing import Union |
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from .chardistribution import EUCJPDistributionAnalysis |
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from .codingstatemachine import CodingStateMachine |
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from .enums import MachineState, ProbingState |
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from .jpcntx import EUCJPContextAnalysis |
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from .mbcharsetprober import MultiByteCharSetProber |
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from .mbcssm import EUCJP_SM_MODEL |
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class EUCJPProber(MultiByteCharSetProber): |
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def __init__(self) -> None: |
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super().__init__() |
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self.coding_sm = CodingStateMachine(EUCJP_SM_MODEL) |
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self.distribution_analyzer = EUCJPDistributionAnalysis() |
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self.context_analyzer = EUCJPContextAnalysis() |
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self.reset() |
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def reset(self) -> None: |
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super().reset() |
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self.context_analyzer.reset() |
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@property |
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def charset_name(self) -> str: |
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return "EUC-JP" |
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@property |
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def language(self) -> str: |
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return "Japanese" |
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def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState: |
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assert self.coding_sm is not None |
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assert self.distribution_analyzer is not None |
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for i, byte in enumerate(byte_str): |
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coding_state = self.coding_sm.next_state(byte) |
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if coding_state == MachineState.ERROR: |
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self.logger.debug( |
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"%s %s prober hit error at byte %s", |
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self.charset_name, |
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self.language, |
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i, |
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) |
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self._state = ProbingState.NOT_ME |
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break |
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if coding_state == MachineState.ITS_ME: |
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self._state = ProbingState.FOUND_IT |
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break |
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if coding_state == MachineState.START: |
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char_len = self.coding_sm.get_current_charlen() |
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if i == 0: |
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self._last_char[1] = byte |
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self.context_analyzer.feed(self._last_char, char_len) |
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self.distribution_analyzer.feed(self._last_char, char_len) |
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else: |
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self.context_analyzer.feed(byte_str[i - 1 : i + 1], char_len) |
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self.distribution_analyzer.feed(byte_str[i - 1 : i + 1], char_len) |
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self._last_char[0] = byte_str[-1] |
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if self.state == ProbingState.DETECTING: |
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if self.context_analyzer.got_enough_data() and ( |
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self.get_confidence() > self.SHORTCUT_THRESHOLD |
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): |
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self._state = ProbingState.FOUND_IT |
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return self.state |
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def get_confidence(self) -> float: |
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assert self.distribution_analyzer is not None |
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context_conf = self.context_analyzer.get_confidence() |
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distrib_conf = self.distribution_analyzer.get_confidence() |
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return max(context_conf, distrib_conf) |
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