Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/chardet/mbcharsetprober.py: 93%

1######################## BEGIN LICENSE BLOCK ######################## 

2# The Original Code is Mozilla Universal charset detector 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) 2001 

7# the Initial Developer. All Rights Reserved. 

8# 

9# Contributor(s): 

10# Mark Pilgrim - port to Python 

11# Shy Shalom - original C code 

12# Proofpoint, Inc. 

13# 

14# This library is free software; you can redistribute it and/or 

15# modify it under the terms of the GNU Lesser General Public 

16# License as published by the Free Software Foundation; either 

17# version 2.1 of the License, or (at your option) any later version. 

18# 

19# This library is distributed in the hope that it will be useful, 

20# but WITHOUT ANY WARRANTY; without even the implied warranty of 

21# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 

22# Lesser General Public License for more details. 

23# 

24# You should have received a copy of the GNU Lesser General Public 

25# License along with this library; if not, see 

26# <https://www.gnu.org/licenses/>. 

27######################### END LICENSE BLOCK ######################### 

28 

29from typing import Optional, Union 

30 

31from .chardistribution import CharDistributionAnalysis 

32from .charsetprober import CharSetProber 

33from .codingstatemachine import CodingStateMachine 

34from .enums import EncodingEra, LanguageFilter, MachineState, ProbingState 

35 

36 

37class MultiByteCharSetProber(CharSetProber): 

38 """ 

39 MultiByteCharSetProber 

40 """ 

41 

42 def __init__( 

43 self, 

44 lang_filter: LanguageFilter = LanguageFilter.ALL, 

45 encoding_era: EncodingEra = EncodingEra.ALL, 

46 ) -> None: 

47 super().__init__(lang_filter=lang_filter, encoding_era=encoding_era) 

48 self.distribution_analyzer: Optional[CharDistributionAnalysis] = None 

49 self.coding_sm: Optional[CodingStateMachine] = None 

50 self._last_char = bytearray(b"\0\0") 

51 

52 def reset(self) -> None: 

53 super().reset() 

54 if self.coding_sm: 

55 self.coding_sm.reset() 

56 if self.distribution_analyzer: 

57 self.distribution_analyzer.reset() 

58 self._last_char = bytearray(b"\0\0") 

59 

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

61 assert self.coding_sm is not None 

62 assert self.distribution_analyzer is not None 

63 

64 for i, byte in enumerate(byte_str): 

65 coding_state = self.coding_sm.next_state(byte) 

66 if coding_state == MachineState.ERROR: 

67 self.logger.debug( 

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

69 self.charset_name, 

70 self.language, 

71 i, 

72 ) 

73 self._state = ProbingState.NOT_ME 

74 break 

75 if coding_state == MachineState.ITS_ME: 

76 self._state = ProbingState.FOUND_IT 

77 break 

78 if coding_state == MachineState.START: 

79 char_len = self.coding_sm.get_current_charlen() 

80 if i == 0: 

81 self._last_char[1] = byte 

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

83 else: 

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

85 

86 self._last_char[0] = byte_str[-1] 

87 

88 if self.state == ProbingState.DETECTING: 

89 if self.distribution_analyzer.got_enough_data() and ( 

90 self.get_confidence() > self.SHORTCUT_THRESHOLD 

91 ): 

92 self._state = ProbingState.FOUND_IT 

93 

94 return self.state 

95 

96 def get_confidence(self) -> float: 

97 assert self.distribution_analyzer is not None 

98 return self.distribution_analyzer.get_confidence()