Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/chardet/sjisprober.py: 96%

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 typing import Union 

29 

30from .chardistribution import SJISDistributionAnalysis 

31from .codingstatemachine import CodingStateMachine 

32from .enums import MachineState, ProbingState 

33from .jpcntx import SJISContextAnalysis 

34from .mbcharsetprober import MultiByteCharSetProber 

35from .mbcssm import SJIS_SM_MODEL 

36 

37 

38class SJISProber(MultiByteCharSetProber): 

39 def __init__(self) -> None: 

40 super().__init__() 

41 self.coding_sm = CodingStateMachine(SJIS_SM_MODEL) 

42 self.distribution_analyzer = SJISDistributionAnalysis() 

43 self.context_analyzer = SJISContextAnalysis() 

44 self.reset() 

45 

46 def reset(self) -> None: 

47 super().reset() 

48 self.context_analyzer.reset() 

49 

50 @property 

51 def charset_name(self) -> str: 

52 return self.context_analyzer.charset_name 

53 

54 @property 

55 def language(self) -> str: 

56 return "Japanese" 

57 

58 def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState: 

59 assert self.coding_sm is not None 

60 assert self.distribution_analyzer is not None 

61 

62 for i, byte in enumerate(byte_str): 

63 coding_state = self.coding_sm.next_state(byte) 

64 if coding_state == MachineState.ERROR: 

65 self.logger.debug( 

66 "%s %s prober hit error at byte %s", 

67 self.charset_name, 

68 self.language, 

69 i, 

70 ) 

71 self._state = ProbingState.NOT_ME 

72 break 

73 if coding_state == MachineState.ITS_ME: 

74 self._state = ProbingState.FOUND_IT 

75 break 

76 if coding_state == MachineState.START: 

77 char_len = self.coding_sm.get_current_charlen() 

78 if i == 0: 

79 self._last_char[1] = byte 

80 self.context_analyzer.feed( 

81 self._last_char[2 - char_len :], char_len 

82 ) 

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

84 else: 

85 self.context_analyzer.feed( 

86 byte_str[i + 1 - char_len : i + 3 - char_len], char_len 

87 ) 

88 self.distribution_analyzer.feed(byte_str[i - 1 : i + 1], char_len) 

89 

90 self._last_char[0] = byte_str[-1] 

91 

92 if self.state == ProbingState.DETECTING: 

93 if self.context_analyzer.got_enough_data() and ( 

94 self.get_confidence() > self.SHORTCUT_THRESHOLD 

95 ): 

96 self._state = ProbingState.FOUND_IT 

97 

98 return self.state 

99 

100 def get_confidence(self) -> float: 

101 assert self.distribution_analyzer is not None 

102 

103 context_conf = self.context_analyzer.get_confidence() 

104 distrib_conf = self.distribution_analyzer.get_confidence() 

105 return max(context_conf, distrib_conf)