Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/isodate/isotzinfo.py: 22%

1""" 

2This module provides an ISO 8601:2004 time zone info parser. 

3 

4It offers a function to parse the time zone offset as specified by ISO 8601. 

5""" 

6 

7import re 

8 

9from isodate.isoerror import ISO8601Error 

10from isodate.tzinfo import UTC, ZERO, FixedOffset 

11 

12TZ_REGEX = ( 

13 r"(?P<tzname>(Z|(?P<tzsign>[+-])" r"(?P<tzhour>[0-9]{2})(:?(?P<tzmin>[0-9]{2}))?)?)" 

14) 

15 

16TZ_RE = re.compile(TZ_REGEX) 

17 

18 

19def build_tzinfo(tzname, tzsign="+", tzhour=0, tzmin=0): 

20 """ 

21 create a tzinfo instance according to given parameters. 

22 

23 tzname: 

24 'Z' ... return UTC 

25 '' | None ... return None 

26 other ... return FixedOffset 

27 """ 

28 if tzname is None or tzname == "": 

29 return None 

30 if tzname == "Z": 

31 return UTC 

32 tzsign = ((tzsign == "-") and -1) or 1 

33 return FixedOffset(tzsign * tzhour, tzsign * tzmin, tzname) 

34 

35 

36def parse_tzinfo(tzstring): 

37 """ 

38 Parses ISO 8601 time zone designators to tzinfo objects. 

39 

40 A time zone designator can be in the following format: 

41 no designator indicates local time zone 

42 Z UTC 

43 +-hhmm basic hours and minutes 

44 +-hh:mm extended hours and minutes 

45 +-hh hours 

46 """ 

47 match = TZ_RE.match(tzstring) 

48 if match: 

49 groups = match.groupdict() 

50 return build_tzinfo( 

51 groups["tzname"], 

52 groups["tzsign"], 

53 int(groups["tzhour"] or 0), 

54 int(groups["tzmin"] or 0), 

55 ) 

56 raise ISO8601Error("%s not a valid time zone info" % tzstring) 

57 

58 

59def tz_isoformat(dt, format="%Z"): 

60 """ 

61 return time zone offset ISO 8601 formatted. 

62 The various ISO formats can be chosen with the format parameter. 

63 

64 if tzinfo is None returns '' 

65 if tzinfo is UTC returns 'Z' 

66 else the offset is rendered to the given format. 

67 format: 

68 %h ... +-HH 

69 %z ... +-HHMM 

70 %Z ... +-HH:MM 

71 """ 

72 tzinfo = dt.tzinfo 

73 if (tzinfo is None) or (tzinfo.utcoffset(dt) is None): 

74 return "" 

75 if tzinfo.utcoffset(dt) == ZERO and tzinfo.dst(dt) == ZERO: 

76 return "Z" 

77 tdelta = tzinfo.utcoffset(dt) 

78 seconds = tdelta.days * 24 * 60 * 60 + tdelta.seconds 

79 sign = ((seconds < 0) and "-") or "+" 

80 seconds = abs(seconds) 

81 minutes, seconds = divmod(seconds, 60) 

82 hours, minutes = divmod(minutes, 60) 

83 if hours > 99: 

84 raise OverflowError("can not handle differences > 99 hours") 

85 if format == "%Z": 

86 return "%s%02d:%02d" % (sign, hours, minutes) 

87 elif format == "%z": 

88 return "%s%02d%02d" % (sign, hours, minutes) 

89 elif format == "%h": 

90 return "%s%02d" % (sign, hours) 

91 raise ValueError('unknown format string "%s"' % format)