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# coding: utf-8 # Modified Work: Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved. # Original Work: Copyright (c) 2018 Character Encoding Detector contributors. https://github.com/chardet from .charsetprober import CharSetProber from .codingstatemachine import CodingStateMachine from .enums import LanguageFilter, ProbingState, MachineState from .escsm import (HZ_SM_MODEL, ISO2022CN_SM_MODEL, ISO2022JP_SM_MODEL, ISO2022KR_SM_MODEL) class EscCharSetProber(CharSetProber): """ This CharSetProber uses a "code scheme" approach for detecting encodings, whereby easily recognizable escape or shift sequences are relied on to identify these encodings. """ def __init__(self, lang_filter=None): super(EscCharSetProber, self).__init__(lang_filter=lang_filter) self.coding_sm = [] if self.lang_filter & LanguageFilter.CHINESE_SIMPLIFIED: self.coding_sm.append(CodingStateMachine(HZ_SM_MODEL)) self.coding_sm.append(CodingStateMachine(ISO2022CN_SM_MODEL)) if self.lang_filter & LanguageFilter.JAPANESE: self.coding_sm.append(CodingStateMachine(ISO2022JP_SM_MODEL)) if self.lang_filter & LanguageFilter.KOREAN: self.coding_sm.append(CodingStateMachine(ISO2022KR_SM_MODEL)) self.active_sm_count = None self._detected_charset = None self._detected_language = None self._state = None self.reset() def reset(self): super(EscCharSetProber, self).reset() for coding_sm in self.coding_sm: if not coding_sm: continue coding_sm.active = True coding_sm.reset() self.active_sm_count = len(self.coding_sm) self._detected_charset = None self._detected_language = None @property def charset_name(self): return self._detected_charset @property def language(self): return self._detected_language def get_confidence(self): if self._detected_charset: return 0.99 else: return 0.00 def feed(self, byte_str): for c in byte_str: for coding_sm in self.coding_sm: if not coding_sm or not coding_sm.active: continue coding_state = coding_sm.next_state(c) if coding_state == MachineState.ERROR: coding_sm.active = False self.active_sm_count -= 1 if self.active_sm_count <= 0: self._state = ProbingState.NOT_ME return self.state elif coding_state == MachineState.ITS_ME: self._state = ProbingState.FOUND_IT self._detected_charset = coding_sm.get_coding_state_machine() self._detected_language = coding_sm.language return self.state return self.state