Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/chardet/mbcharsetprober.py: 100%

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, write to the Free Software 

26# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 

27# 02110-1301 USA 

28######################### END LICENSE BLOCK ######################### 

29 

30from typing import Optional, Union 

31 

32from .chardistribution import CharDistributionAnalysis 

33from .charsetprober import CharSetProber 

34from .codingstatemachine import CodingStateMachine 

35from .enums import LanguageFilter, MachineState, ProbingState 

36 

37 

38class MultiByteCharSetProber(CharSetProber): 

39 """ 

40 MultiByteCharSetProber 

41 """ 

42 

43 def __init__(self, lang_filter: LanguageFilter = LanguageFilter.NONE) -> None: 

44 super().__init__(lang_filter=lang_filter) 

45 self.distribution_analyzer: Optional[CharDistributionAnalysis] = None 

46 self.coding_sm: Optional[CodingStateMachine] = None 

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

48 

49 def reset(self) -> None: 

50 super().reset() 

51 if self.coding_sm: 

52 self.coding_sm.reset() 

53 if self.distribution_analyzer: 

54 self.distribution_analyzer.reset() 

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

56 

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

58 assert self.coding_sm is not None 

59 assert self.distribution_analyzer is not None 

60 

61 for i, byte in enumerate(byte_str): 

62 coding_state = self.coding_sm.next_state(byte) 

63 if coding_state == MachineState.ERROR: 

64 self.logger.debug( 

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

66 self.charset_name, 

67 self.language, 

68 i, 

69 ) 

70 self._state = ProbingState.NOT_ME 

71 break 

72 if coding_state == MachineState.ITS_ME: 

73 self._state = ProbingState.FOUND_IT 

74 break 

75 if coding_state == MachineState.START: 

76 char_len = self.coding_sm.get_current_charlen() 

77 if i == 0: 

78 self._last_char[1] = byte 

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

80 else: 

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

82 

83 self._last_char[0] = byte_str[-1] 

84 

85 if self.state == ProbingState.DETECTING: 

86 if self.distribution_analyzer.got_enough_data() and ( 

87 self.get_confidence() > self.SHORTCUT_THRESHOLD 

88 ): 

89 self._state = ProbingState.FOUND_IT 

90 

91 return self.state 

92 

93 def get_confidence(self) -> float: 

94 assert self.distribution_analyzer is not None 

95 return self.distribution_analyzer.get_confidence()