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| ######################## BEGIN LICENSE BLOCK ######################## | |
| # The Original Code is mozilla.org 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 Optional, Union | |
| from .charsetprober import CharSetProber | |
| from .codingstatemachine import CodingStateMachine | |
| from .enums import LanguageFilter, MachineState, ProbingState | |
| 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: LanguageFilter = LanguageFilter.NONE) -> None: | |
| super().__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 = 0 | |
| self._detected_charset: Optional[str] = None | |
| self._detected_language: Optional[str] = None | |
| self._state = ProbingState.DETECTING | |
| self.reset() | |
| def reset(self) -> None: | |
| super().reset() | |
| for coding_sm in self.coding_sm: | |
| coding_sm.active = True | |
| coding_sm.reset() | |
| self.active_sm_count = len(self.coding_sm) | |
| self._detected_charset = None | |
| self._detected_language = None | |
| def charset_name(self) -> Optional[str]: | |
| return self._detected_charset | |
| def language(self) -> Optional[str]: | |
| return self._detected_language | |
| def get_confidence(self) -> float: | |
| return 0.99 if self._detected_charset else 0.00 | |
| def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState: | |
| for c in byte_str: | |
| for coding_sm in self.coding_sm: | |
| if 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 | |