Hide keyboard shortcuts

Hot-keys on this page

r m x p   toggle line displays

j k   next/prev highlighted chunk

0   (zero) top of page

1   (one) first highlighted chunk

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 

28from .mbcharsetprober import MultiByteCharSetProber 

29from .codingstatemachine import CodingStateMachine 

30from .chardistribution import SJISDistributionAnalysis 

31from .jpcntx import SJISContextAnalysis 

32from .mbcssm import SJIS_SM_MODEL 

33from .enums import ProbingState, MachineState 

34 

35 

36class SJISProber(MultiByteCharSetProber): 

37 def __init__(self): 

38 super(SJISProber, self).__init__() 

39 self.coding_sm = CodingStateMachine(SJIS_SM_MODEL) 

40 self.distribution_analyzer = SJISDistributionAnalysis() 

41 self.context_analyzer = SJISContextAnalysis() 

42 self.reset() 

43 

44 def reset(self): 

45 super(SJISProber, self).reset() 

46 self.context_analyzer.reset() 

47 

48 @property 

49 def charset_name(self): 

50 return self.context_analyzer.charset_name 

51 

52 @property 

53 def language(self): 

54 return "Japanese" 

55 

56 def feed(self, byte_str): 

57 for i in range(len(byte_str)): 

58 coding_state = self.coding_sm.next_state(byte_str[i]) 

59 if coding_state == MachineState.ERROR: 

60 self.logger.debug('%s %s prober hit error at byte %s', 

61 self.charset_name, self.language, i) 

62 self._state = ProbingState.NOT_ME 

63 break 

64 elif coding_state == MachineState.ITS_ME: 

65 self._state = ProbingState.FOUND_IT 

66 break 

67 elif coding_state == MachineState.START: 

68 char_len = self.coding_sm.get_current_charlen() 

69 if i == 0: 

70 self._last_char[1] = byte_str[0] 

71 self.context_analyzer.feed(self._last_char[2 - char_len:], 

72 char_len) 

73 self.distribution_analyzer.feed(self._last_char, char_len) 

74 else: 

75 self.context_analyzer.feed(byte_str[i + 1 - char_len:i + 3 

76 - char_len], char_len) 

77 self.distribution_analyzer.feed(byte_str[i - 1:i + 1], 

78 char_len) 

79 

80 self._last_char[0] = byte_str[-1] 

81 

82 if self.state == ProbingState.DETECTING: 

83 if (self.context_analyzer.got_enough_data() and 

84 (self.get_confidence() > self.SHORTCUT_THRESHOLD)): 

85 self._state = ProbingState.FOUND_IT 

86 

87 return self.state 

88 

89 def get_confidence(self): 

90 context_conf = self.context_analyzer.get_confidence() 

91 distrib_conf = self.distribution_analyzer.get_confidence() 

92 return max(context_conf, distrib_conf)