Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/isodate/isotzinfo.py @ 4:79f47841a781 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
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1 ##############################################################################
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2 # Copyright 2009, Gerhard Weis
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3 # All rights reserved.
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4 #
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5 # Redistribution and use in source and binary forms, with or without
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6 # modification, are permitted provided that the following conditions are met:
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7 #
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8 # * Redistributions of source code must retain the above copyright notice,
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9 # this list of conditions and the following disclaimer.
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10 # * Redistributions in binary form must reproduce the above copyright notice,
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11 # this list of conditions and the following disclaimer in the documentation
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12 # and/or other materials provided with the distribution.
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13 # * Neither the name of the authors nor the names of its contributors
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14 # may be used to endorse or promote products derived from this software
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15 # without specific prior written permission.
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16 #
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17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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18 # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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21 # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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22 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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23 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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24 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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25 # CONTRACT, STRICT LIABILITY, OR TORT
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26 ##############################################################################
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27 '''
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28 This module provides an ISO 8601:2004 time zone info parser.
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29
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30 It offers a function to parse the time zone offset as specified by ISO 8601.
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31 '''
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32 import re
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33
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34 from isodate.isoerror import ISO8601Error
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35 from isodate.tzinfo import UTC, FixedOffset, ZERO
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36
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37 TZ_REGEX = r"(?P<tzname>(Z|(?P<tzsign>[+-])"\
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38 r"(?P<tzhour>[0-9]{2})(:?(?P<tzmin>[0-9]{2}))?)?)"
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39
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40 TZ_RE = re.compile(TZ_REGEX)
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41
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42
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43 def build_tzinfo(tzname, tzsign='+', tzhour=0, tzmin=0):
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44 '''
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45 create a tzinfo instance according to given parameters.
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46
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47 tzname:
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48 'Z' ... return UTC
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49 '' | None ... return None
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50 other ... return FixedOffset
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51 '''
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52 if tzname is None or tzname == '':
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53 return None
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54 if tzname == 'Z':
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55 return UTC
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56 tzsign = ((tzsign == '-') and -1) or 1
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57 return FixedOffset(tzsign * tzhour, tzsign * tzmin, tzname)
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58
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59
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60 def parse_tzinfo(tzstring):
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61 '''
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62 Parses ISO 8601 time zone designators to tzinfo objecs.
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63
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64 A time zone designator can be in the following format:
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65 no designator indicates local time zone
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66 Z UTC
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67 +-hhmm basic hours and minutes
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68 +-hh:mm extended hours and minutes
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69 +-hh hours
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70 '''
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71 match = TZ_RE.match(tzstring)
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72 if match:
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73 groups = match.groupdict()
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74 return build_tzinfo(groups['tzname'], groups['tzsign'],
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75 int(groups['tzhour'] or 0),
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76 int(groups['tzmin'] or 0))
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77 raise ISO8601Error('%s not a valid time zone info' % tzstring)
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78
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79
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80 def tz_isoformat(dt, format='%Z'):
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81 '''
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82 return time zone offset ISO 8601 formatted.
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83 The various ISO formats can be chosen with the format parameter.
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84
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85 if tzinfo is None returns ''
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86 if tzinfo is UTC returns 'Z'
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87 else the offset is rendered to the given format.
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88 format:
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89 %h ... +-HH
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90 %z ... +-HHMM
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91 %Z ... +-HH:MM
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92 '''
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93 tzinfo = dt.tzinfo
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94 if (tzinfo is None) or (tzinfo.utcoffset(dt) is None):
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95 return ''
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96 if tzinfo.utcoffset(dt) == ZERO and tzinfo.dst(dt) == ZERO:
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97 return 'Z'
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98 tdelta = tzinfo.utcoffset(dt)
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99 seconds = tdelta.days * 24 * 60 * 60 + tdelta.seconds
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100 sign = ((seconds < 0) and '-') or '+'
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101 seconds = abs(seconds)
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102 minutes, seconds = divmod(seconds, 60)
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103 hours, minutes = divmod(minutes, 60)
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104 if hours > 99:
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105 raise OverflowError('can not handle differences > 99 hours')
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106 if format == '%Z':
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107 return '%s%02d:%02d' % (sign, hours, minutes)
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108 elif format == '%z':
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109 return '%s%02d%02d' % (sign, hours, minutes)
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110 elif format == '%h':
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111 return '%s%02d' % (sign, hours)
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112 raise ValueError('unknown format string "%s"' % format)