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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 Union | |
| from .charsetprober import CharSetProber | |
| from .codingstatemachine import CodingStateMachine | |
| from .enums import MachineState, ProbingState | |
| from .mbcssm import UTF8_SM_MODEL | |
| class UTF8Prober(CharSetProber): | |
| ONE_CHAR_PROB = 0.5 | |
| def __init__(self) -> None: | |
| super().__init__() | |
| self.coding_sm = CodingStateMachine(UTF8_SM_MODEL) | |
| self._num_mb_chars = 0 | |
| self.reset() | |
| def reset(self) -> None: | |
| super().reset() | |
| self.coding_sm.reset() | |
| self._num_mb_chars = 0 | |
| def charset_name(self) -> str: | |
| return "utf-8" | |
| def language(self) -> str: | |
| return "" | |
| def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState: | |
| for c in byte_str: | |
| coding_state = self.coding_sm.next_state(c) | |
| if coding_state == MachineState.ERROR: | |
| self._state = ProbingState.NOT_ME | |
| break | |
| if coding_state == MachineState.ITS_ME: | |
| self._state = ProbingState.FOUND_IT | |
| break | |
| if coding_state == MachineState.START: | |
| if self.coding_sm.get_current_charlen() >= 2: | |
| self._num_mb_chars += 1 | |
| if self.state == ProbingState.DETECTING: | |
| if self.get_confidence() > self.SHORTCUT_THRESHOLD: | |
| self._state = ProbingState.FOUND_IT | |
| return self.state | |
| def get_confidence(self) -> float: | |
| unlike = 0.99 | |
| if self._num_mb_chars < 6: | |
| unlike *= self.ONE_CHAR_PROB**self._num_mb_chars | |
| return 1.0 - unlike | |
| return unlike | |