Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/isodate/isotime.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -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 modules provides a method to parse an ISO 8601:2004 time string to a
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29 Python datetime.time instance.
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30
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31 It supports all basic and extended formats including time zone specifications
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32 as described in the ISO standard.
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33 '''
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34 import re
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35 from decimal import Decimal
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36 from datetime import time
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37
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38 from isodate.isostrf import strftime, TIME_EXT_COMPLETE, TZ_EXT
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39 from isodate.isoerror import ISO8601Error
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40 from isodate.isotzinfo import TZ_REGEX, build_tzinfo
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41
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42 TIME_REGEX_CACHE = []
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43 # used to cache regular expressions to parse ISO time strings.
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44
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45
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46 def build_time_regexps():
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47 '''
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48 Build regular expressions to parse ISO time string.
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49
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50 The regular expressions are compiled and stored in TIME_REGEX_CACHE
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51 for later reuse.
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52 '''
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53 if not TIME_REGEX_CACHE:
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54 # ISO 8601 time representations allow decimal fractions on least
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55 # significant time component. Command and Full Stop are both valid
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56 # fraction separators.
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57 # The letter 'T' is allowed as time designator in front of a time
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58 # expression.
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59 # Immediately after a time expression, a time zone definition is
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60 # allowed.
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61 # a TZ may be missing (local time), be a 'Z' for UTC or a string of
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62 # +-hh:mm where the ':mm' part can be skipped.
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63 # TZ information patterns:
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64 # ''
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65 # Z
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66 # +-hh:mm
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67 # +-hhmm
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68 # +-hh =>
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69 # isotzinfo.TZ_REGEX
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70 # 1. complete time:
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71 # hh:mm:ss.ss ... extended format
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72 TIME_REGEX_CACHE.append(re.compile(r"T?(?P<hour>[0-9]{2}):"
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73 r"(?P<minute>[0-9]{2}):"
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74 r"(?P<second>[0-9]{2}"
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75 r"([,.][0-9]+)?)" + TZ_REGEX))
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76 # hhmmss.ss ... basic format
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77 TIME_REGEX_CACHE.append(re.compile(r"T?(?P<hour>[0-9]{2})"
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78 r"(?P<minute>[0-9]{2})"
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79 r"(?P<second>[0-9]{2}"
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80 r"([,.][0-9]+)?)" + TZ_REGEX))
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81 # 2. reduced accuracy:
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82 # hh:mm.mm ... extended format
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83 TIME_REGEX_CACHE.append(re.compile(r"T?(?P<hour>[0-9]{2}):"
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84 r"(?P<minute>[0-9]{2}"
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85 r"([,.][0-9]+)?)" + TZ_REGEX))
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86 # hhmm.mm ... basic format
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87 TIME_REGEX_CACHE.append(re.compile(r"T?(?P<hour>[0-9]{2})"
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88 r"(?P<minute>[0-9]{2}"
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89 r"([,.][0-9]+)?)" + TZ_REGEX))
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90 # hh.hh ... basic format
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91 TIME_REGEX_CACHE.append(re.compile(r"T?(?P<hour>[0-9]{2}"
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92 r"([,.][0-9]+)?)" + TZ_REGEX))
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93 return TIME_REGEX_CACHE
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94
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95
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96 def parse_time(timestring):
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97 '''
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98 Parses ISO 8601 times into datetime.time objects.
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99
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100 Following ISO 8601 formats are supported:
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101 (as decimal separator a ',' or a '.' is allowed)
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102 hhmmss.ssTZD basic complete time
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103 hh:mm:ss.ssTZD extended compelte time
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104 hhmm.mmTZD basic reduced accuracy time
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105 hh:mm.mmTZD extended reduced accuracy time
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106 hh.hhTZD basic reduced accuracy time
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107 TZD is the time zone designator which can be in the following format:
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108 no designator indicates local time zone
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109 Z UTC
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110 +-hhmm basic hours and minutes
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111 +-hh:mm extended hours and minutes
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112 +-hh hours
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113 '''
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114 isotimes = build_time_regexps()
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115 for pattern in isotimes:
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116 match = pattern.match(timestring)
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117 if match:
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118 groups = match.groupdict()
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119 for key, value in groups.items():
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120 if value is not None:
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121 groups[key] = value.replace(',', '.')
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122 tzinfo = build_tzinfo(groups['tzname'], groups['tzsign'],
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123 int(groups['tzhour'] or 0),
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124 int(groups['tzmin'] or 0))
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125 if 'second' in groups:
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126 # round to microseconds if fractional seconds are more precise
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127 second = Decimal(groups['second']).quantize(Decimal('.000001'))
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128 microsecond = (second - int(second)) * int(1e6)
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129 # int(...) ... no rounding
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130 # to_integral() ... rounding
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131 return time(int(groups['hour']), int(groups['minute']),
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132 int(second), int(microsecond.to_integral()),
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133 tzinfo)
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134 if 'minute' in groups:
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135 minute = Decimal(groups['minute'])
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136 second = (minute - int(minute)) * 60
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137 microsecond = (second - int(second)) * int(1e6)
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138 return time(int(groups['hour']), int(minute), int(second),
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139 int(microsecond.to_integral()), tzinfo)
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140 else:
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141 microsecond, second, minute = 0, 0, 0
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142 hour = Decimal(groups['hour'])
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143 minute = (hour - int(hour)) * 60
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144 second = (minute - int(minute)) * 60
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145 microsecond = (second - int(second)) * int(1e6)
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146 return time(int(hour), int(minute), int(second),
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147 int(microsecond.to_integral()), tzinfo)
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148 raise ISO8601Error('Unrecognised ISO 8601 time format: %r' % timestring)
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149
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150
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151 def time_isoformat(ttime, format=TIME_EXT_COMPLETE + TZ_EXT):
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152 '''
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153 Format time strings.
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154
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155 This method is just a wrapper around isodate.isostrf.strftime and uses
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156 Time-Extended-Complete with extended time zone as default format.
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157 '''
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158 return strftime(ttime, format)