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| 1 ######################## BEGIN LICENSE BLOCK ######################## | |
| 2 # The Original Code is mozilla.org code. | |
| 3 # | |
| 4 # The Initial Developer of the Original Code is | |
| 5 # Netscape Communications Corporation. | |
| 6 # Portions created by the Initial Developer are Copyright (C) 1998 | |
| 7 # the Initial Developer. All Rights Reserved. | |
| 8 # | |
| 9 # Contributor(s): | |
| 10 # Mark Pilgrim - port to Python | |
| 11 # | |
| 12 # This library is free software; you can redistribute it and/or | |
| 13 # modify it under the terms of the GNU Lesser General Public | |
| 14 # License as published by the Free Software Foundation; either | |
| 15 # version 2.1 of the License, or (at your option) any later version. | |
| 16 # | |
| 17 # This library is distributed in the hope that it will be useful, | |
| 18 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 20 # Lesser General Public License for more details. | |
| 21 # | |
| 22 # You should have received a copy of the GNU Lesser General Public | |
| 23 # License along with this library; if not, write to the Free Software | |
| 24 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
| 25 # 02110-1301 USA | |
| 26 ######################### END LICENSE BLOCK ######################### | |
| 27 | |
| 28 import sys | |
| 29 from . import constants | |
| 30 from .mbcharsetprober import MultiByteCharSetProber | |
| 31 from .codingstatemachine import CodingStateMachine | |
| 32 from .chardistribution import EUCJPDistributionAnalysis | |
| 33 from .jpcntx import EUCJPContextAnalysis | |
| 34 from .mbcssm import EUCJPSMModel | |
| 35 | |
| 36 | |
| 37 class EUCJPProber(MultiByteCharSetProber): | |
| 38 def __init__(self): | |
| 39 MultiByteCharSetProber.__init__(self) | |
| 40 self._mCodingSM = CodingStateMachine(EUCJPSMModel) | |
| 41 self._mDistributionAnalyzer = EUCJPDistributionAnalysis() | |
| 42 self._mContextAnalyzer = EUCJPContextAnalysis() | |
| 43 self.reset() | |
| 44 | |
| 45 def reset(self): | |
| 46 MultiByteCharSetProber.reset(self) | |
| 47 self._mContextAnalyzer.reset() | |
| 48 | |
| 49 def get_charset_name(self): | |
| 50 return "EUC-JP" | |
| 51 | |
| 52 def feed(self, aBuf): | |
| 53 aLen = len(aBuf) | |
| 54 for i in range(0, aLen): | |
| 55 # PY3K: aBuf is a byte array, so aBuf[i] is an int, not a byte | |
| 56 codingState = self._mCodingSM.next_state(aBuf[i]) | |
| 57 if codingState == constants.eError: | |
| 58 if constants._debug: | |
| 59 sys.stderr.write(self.get_charset_name() | |
| 60 + ' prober hit error at byte ' + str(i) | |
| 61 + '\n') | |
| 62 self._mState = constants.eNotMe | |
| 63 break | |
| 64 elif codingState == constants.eItsMe: | |
| 65 self._mState = constants.eFoundIt | |
| 66 break | |
| 67 elif codingState == constants.eStart: | |
| 68 charLen = self._mCodingSM.get_current_charlen() | |
| 69 if i == 0: | |
| 70 self._mLastChar[1] = aBuf[0] | |
| 71 self._mContextAnalyzer.feed(self._mLastChar, charLen) | |
| 72 self._mDistributionAnalyzer.feed(self._mLastChar, charLen) | |
| 73 else: | |
| 74 self._mContextAnalyzer.feed(aBuf[i - 1:i + 1], charLen) | |
| 75 self._mDistributionAnalyzer.feed(aBuf[i - 1:i + 1], | |
| 76 charLen) | |
| 77 | |
| 78 self._mLastChar[0] = aBuf[aLen - 1] | |
| 79 | |
| 80 if self.get_state() == constants.eDetecting: | |
| 81 if (self._mContextAnalyzer.got_enough_data() and | |
| 82 (self.get_confidence() > constants.SHORTCUT_THRESHOLD)): | |
| 83 self._mState = constants.eFoundIt | |
| 84 | |
| 85 return self.get_state() | |
| 86 | |
| 87 def get_confidence(self): | |
| 88 contxtCf = self._mContextAnalyzer.get_confidence() | |
| 89 distribCf = self._mDistributionAnalyzer.get_confidence() | |
| 90 return max(contxtCf, distribCf) | |
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