Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/chardet/eucjpprober.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 EUCJPDistributionAnalysis 

31from .codingstatemachine import CodingStateMachine 

32from .enums import MachineState, ProbingState 

33from .jpcntx import EUCJPContextAnalysis 

34from .mbcharsetprober import MultiByteCharSetProber 

35from .mbcssm import EUCJP_SM_MODEL 

36 

37 

38class EUCJPProber(MultiByteCharSetProber): 

39 def __init__(self) -> None: 

40 super().__init__() 

41 self.coding_sm = CodingStateMachine(EUCJP_SM_MODEL) 

42 self.distribution_analyzer = EUCJPDistributionAnalysis() 

43 self.context_analyzer = EUCJPContextAnalysis() 

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 "EUC-JP" 

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 # PY3K: byte_str is a byte array, so byte is an int, not a byte 

64 coding_state = self.coding_sm.next_state(byte) 

65 if coding_state == MachineState.ERROR: 

66 self.logger.debug( 

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

68 self.charset_name, 

69 self.language, 

70 i, 

71 ) 

72 self._state = ProbingState.NOT_ME 

73 break 

74 if coding_state == MachineState.ITS_ME: 

75 self._state = ProbingState.FOUND_IT 

76 break 

77 if coding_state == MachineState.START: 

78 char_len = self.coding_sm.get_current_charlen() 

79 if i == 0: 

80 self._last_char[1] = byte 

81 self.context_analyzer.feed(self._last_char, char_len) 

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

83 else: 

84 self.context_analyzer.feed(byte_str[i - 1 : i + 1], char_len) 

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

86 

87 self._last_char[0] = byte_str[-1] 

88 

89 if self.state == ProbingState.DETECTING: 

90 if self.context_analyzer.got_enough_data() and ( 

91 self.get_confidence() > self.SHORTCUT_THRESHOLD 

92 ): 

93 self._state = ProbingState.FOUND_IT 

94 

95 return self.state 

96 

97 def get_confidence(self) -> float: 

98 assert self.distribution_analyzer is not None 

99 

100 context_conf = self.context_analyzer.get_confidence() 

101 distrib_conf = self.distribution_analyzer.get_confidence() 

102 return max(context_conf, distrib_conf)