| ######################## 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 .chardistribution import SJISDistributionAnalysis |
| from .codingstatemachine import CodingStateMachine |
| from .enums import MachineState, ProbingState |
| from .jpcntx import SJISContextAnalysis |
| from .mbcharsetprober import MultiByteCharSetProber |
| from .mbcssm import SJIS_SM_MODEL |
| |
| |
| class SJISProber(MultiByteCharSetProber): |
| def __init__(self): |
| super().__init__() |
| self.coding_sm = CodingStateMachine(SJIS_SM_MODEL) |
| self.distribution_analyzer = SJISDistributionAnalysis() |
| self.context_analyzer = SJISContextAnalysis() |
| self.reset() |
| |
| def reset(self): |
| super().reset() |
| self.context_analyzer.reset() |
| |
| @property |
| def charset_name(self): |
| return self.context_analyzer.charset_name |
| |
| @property |
| def language(self): |
| return "Japanese" |
| |
| def feed(self, byte_str): |
| for i, byte in enumerate(byte_str): |
| coding_state = self.coding_sm.next_state(byte) |
| if coding_state == MachineState.ERROR: |
| self.logger.debug( |
| "%s %s prober hit error at byte %s", |
| self.charset_name, |
| self.language, |
| i, |
| ) |
| self._state = ProbingState.NOT_ME |
| break |
| if coding_state == MachineState.ITS_ME: |
| self._state = ProbingState.FOUND_IT |
| break |
| if coding_state == MachineState.START: |
| char_len = self.coding_sm.get_current_charlen() |
| if i == 0: |
| self._last_char[1] = byte |
| self.context_analyzer.feed( |
| self._last_char[2 - char_len :], char_len |
| ) |
| self.distribution_analyzer.feed(self._last_char, char_len) |
| else: |
| self.context_analyzer.feed( |
| byte_str[i + 1 - char_len : i + 3 - char_len], char_len |
| ) |
| self.distribution_analyzer.feed(byte_str[i - 1 : i + 1], char_len) |
| |
| self._last_char[0] = byte_str[-1] |
| |
| if self.state == ProbingState.DETECTING: |
| if self.context_analyzer.got_enough_data() and ( |
| self.get_confidence() > self.SHORTCUT_THRESHOLD |
| ): |
| self._state = ProbingState.FOUND_IT |
| |
| return self.state |
| |
| def get_confidence(self): |
| context_conf = self.context_analyzer.get_confidence() |
| distrib_conf = self.distribution_analyzer.get_confidence() |
| return max(context_conf, distrib_conf) |
