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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 .enums import ProbingState, MachineState | |
| from .mbcharsetprober import MultiByteCharSetProber | |
| from .codingstatemachine import CodingStateMachine | |
| from .chardistribution import EUCJPDistributionAnalysis | |
| from .jpcntx import EUCJPContextAnalysis | |
| from .mbcssm import EUCJP_SM_MODEL | |
| class EUCJPProber(MultiByteCharSetProber): | |
| def __init__(self): | |
| super(EUCJPProber, self).__init__() | |
| self.coding_sm = CodingStateMachine(EUCJP_SM_MODEL) | |
| self.distribution_analyzer = EUCJPDistributionAnalysis() | |
| self.context_analyzer = EUCJPContextAnalysis() | |
| self.reset() | |
| def reset(self): | |
| super(EUCJPProber, self).reset() | |
| self.context_analyzer.reset() | |
| def charset_name(self): | |
| return "EUC-JP" | |
| def language(self): | |
| return "Japanese" | |
| def feed(self, byte_str): | |
| for i in range(len(byte_str)): | |
| # PY3K: byte_str is a byte array, so byte_str[i] is an int, not a byte | |
| coding_state = self.coding_sm.next_state(byte_str[i]) | |
| 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 | |
| elif coding_state == MachineState.ITS_ME: | |
| self._state = ProbingState.FOUND_IT | |
| break | |
| elif coding_state == MachineState.START: | |
| char_len = self.coding_sm.get_current_charlen() | |
| if i == 0: | |
| self._last_char[1] = byte_str[0] | |
| self.context_analyzer.feed(self._last_char, char_len) | |
| self.distribution_analyzer.feed(self._last_char, char_len) | |
| else: | |
| self.context_analyzer.feed(byte_str[i - 1:i + 1], | |
| 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) | |