Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/isodate/isodates.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 date string to a
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29 python datetime.date instance.
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30
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31 It supports all basic, extended and expanded formats as described in the ISO
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32 standard. The only limitations it has, are given by the Python datetime.date
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33 implementation, which does not support dates before 0001-01-01.
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34 '''
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35 import re
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36 from datetime import date, timedelta
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37
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38 from isodate.isostrf import strftime, DATE_EXT_COMPLETE
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39 from isodate.isoerror import ISO8601Error
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40
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41 DATE_REGEX_CACHE = {}
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42 # A dictionary to cache pre-compiled regular expressions.
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43 # A set of regular expressions is identified, by number of year digits allowed
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44 # and whether a plus/minus sign is required or not. (This option is changeable
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45 # only for 4 digit years).
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46
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47
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48 def build_date_regexps(yeardigits=4, expanded=False):
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49 '''
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50 Compile set of regular expressions to parse ISO dates. The expressions will
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51 be created only if they are not already in REGEX_CACHE.
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52
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53 It is necessary to fix the number of year digits, else it is not possible
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54 to automatically distinguish between various ISO date formats.
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55
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56 ISO 8601 allows more than 4 digit years, on prior agreement, but then a +/-
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57 sign is required (expanded format). To support +/- sign for 4 digit years,
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58 the expanded parameter needs to be set to True.
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59 '''
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60 if yeardigits != 4:
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61 expanded = True
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62 if (yeardigits, expanded) not in DATE_REGEX_CACHE:
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63 cache_entry = []
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64 # ISO 8601 expanded DATE formats allow an arbitrary number of year
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65 # digits with a leading +/- sign.
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66 if expanded:
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67 sign = 1
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68 else:
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69 sign = 0
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70 # 1. complete dates:
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71 # YYYY-MM-DD or +- YYYYYY-MM-DD... extended date format
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72 cache_entry.append(re.compile(r"(?P<sign>[+-]){%d}(?P<year>[0-9]{%d})"
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73 r"-(?P<month>[0-9]{2})-(?P<day>[0-9]{2})"
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74 % (sign, yeardigits)))
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75 # YYYYMMDD or +- YYYYYYMMDD... basic date format
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76 cache_entry.append(re.compile(r"(?P<sign>[+-]){%d}(?P<year>[0-9]{%d})"
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77 r"(?P<month>[0-9]{2})(?P<day>[0-9]{2})"
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78 % (sign, yeardigits)))
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79 # 2. complete week dates:
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80 # YYYY-Www-D or +-YYYYYY-Www-D ... extended week date
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81 cache_entry.append(re.compile(r"(?P<sign>[+-]){%d}(?P<year>[0-9]{%d})"
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82 r"-W(?P<week>[0-9]{2})-(?P<day>[0-9]{1})"
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83 % (sign, yeardigits)))
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84 # YYYYWwwD or +-YYYYYYWwwD ... basic week date
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85 cache_entry.append(re.compile(r"(?P<sign>[+-]){%d}(?P<year>[0-9]{%d})W"
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86 r"(?P<week>[0-9]{2})(?P<day>[0-9]{1})"
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87 % (sign, yeardigits)))
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88 # 3. ordinal dates:
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89 # YYYY-DDD or +-YYYYYY-DDD ... extended format
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90 cache_entry.append(re.compile(r"(?P<sign>[+-]){%d}(?P<year>[0-9]{%d})"
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91 r"-(?P<day>[0-9]{3})"
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92 % (sign, yeardigits)))
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93 # YYYYDDD or +-YYYYYYDDD ... basic format
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94 cache_entry.append(re.compile(r"(?P<sign>[+-]){%d}(?P<year>[0-9]{%d})"
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95 r"(?P<day>[0-9]{3})"
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96 % (sign, yeardigits)))
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97 # 4. week dates:
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98 # YYYY-Www or +-YYYYYY-Www ... extended reduced accuracy week date
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99 cache_entry.append(re.compile(r"(?P<sign>[+-]){%d}(?P<year>[0-9]{%d})"
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100 r"-W(?P<week>[0-9]{2})"
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101 % (sign, yeardigits)))
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102 # YYYYWww or +-YYYYYYWww ... basic reduced accuracy week date
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103 cache_entry.append(re.compile(r"(?P<sign>[+-]){%d}(?P<year>[0-9]{%d})W"
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104 r"(?P<week>[0-9]{2})"
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105 % (sign, yeardigits)))
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106 # 5. month dates:
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107 # YYY-MM or +-YYYYYY-MM ... reduced accuracy specific month
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108 cache_entry.append(re.compile(r"(?P<sign>[+-]){%d}(?P<year>[0-9]{%d})"
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109 r"-(?P<month>[0-9]{2})"
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110 % (sign, yeardigits)))
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111 # YYYMM or +-YYYYYYMM ... basic incomplete month date format
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112 cache_entry.append(re.compile(r"(?P<sign>[+-]){%d}(?P<year>[0-9]{%d})"
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113 r"(?P<month>[0-9]{2})"
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114 % (sign, yeardigits)))
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115 # 6. year dates:
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116 # YYYY or +-YYYYYY ... reduced accuracy specific year
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117 cache_entry.append(re.compile(r"(?P<sign>[+-]){%d}(?P<year>[0-9]{%d})"
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118 % (sign, yeardigits)))
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119 # 7. century dates:
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120 # YY or +-YYYY ... reduced accuracy specific century
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121 cache_entry.append(re.compile(r"(?P<sign>[+-]){%d}"
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122 r"(?P<century>[0-9]{%d})"
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123 % (sign, yeardigits - 2)))
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124
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125 DATE_REGEX_CACHE[(yeardigits, expanded)] = cache_entry
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126 return DATE_REGEX_CACHE[(yeardigits, expanded)]
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127
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128
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129 def parse_date(
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130 datestring,
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131 yeardigits=4, expanded=False, defaultmonth=1, defaultday=1):
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132 '''
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133 Parse an ISO 8601 date string into a datetime.date object.
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134
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135 As the datetime.date implementation is limited to dates starting from
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136 0001-01-01, negative dates (BC) and year 0 can not be parsed by this
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137 method.
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138
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139 For incomplete dates, this method chooses the first day for it. For
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140 instance if only a century is given, this method returns the 1st of
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141 January in year 1 of this century.
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142
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143 supported formats: (expanded formats are shown with 6 digits for year)
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144 YYYYMMDD +-YYYYYYMMDD basic complete date
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145 YYYY-MM-DD +-YYYYYY-MM-DD extended complete date
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146 YYYYWwwD +-YYYYYYWwwD basic complete week date
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147 YYYY-Www-D +-YYYYYY-Www-D extended complete week date
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148 YYYYDDD +-YYYYYYDDD basic ordinal date
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149 YYYY-DDD +-YYYYYY-DDD extended ordinal date
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150 YYYYWww +-YYYYYYWww basic incomplete week date
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151 YYYY-Www +-YYYYYY-Www extended incomplete week date
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152 YYYMM +-YYYYYYMM basic incomplete month date
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153 YYY-MM +-YYYYYY-MM incomplete month date
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154 YYYY +-YYYYYY incomplete year date
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155 YY +-YYYY incomplete century date
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156
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157 @param datestring: the ISO date string to parse
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158 @param yeardigits: how many digits are used to represent a year
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159 @param expanded: if True then +/- signs are allowed. This parameter
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160 is forced to True, if yeardigits != 4
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161
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162 @return: a datetime.date instance represented by datestring
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163 @raise ISO8601Error: if this function can not parse the datestring
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164 @raise ValueError: if datestring can not be represented by datetime.date
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165 '''
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166 if yeardigits != 4:
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167 expanded = True
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168 isodates = build_date_regexps(yeardigits, expanded)
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169 for pattern in isodates:
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170 match = pattern.match(datestring)
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171 if match:
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172 groups = match.groupdict()
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173 # sign, century, year, month, week, day,
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174 # FIXME: negative dates not possible with python standard types
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175 sign = (groups['sign'] == '-' and -1) or 1
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176 if 'century' in groups:
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177 return date(
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178 sign * (int(groups['century']) * 100 + 1),
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179 defaultmonth, defaultday)
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180 if 'month' not in groups: # weekdate or ordinal date
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181 ret = date(sign * int(groups['year']), 1, 1)
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182 if 'week' in groups:
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183 isotuple = ret.isocalendar()
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184 if 'day' in groups:
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185 days = int(groups['day'] or 1)
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186 else:
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187 days = 1
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188 # if first week in year, do weeks-1
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189 return ret + timedelta(weeks=int(groups['week']) -
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190 (((isotuple[1] == 1) and 1) or 0),
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191 days=-isotuple[2] + days)
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192 elif 'day' in groups: # ordinal date
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193 return ret + timedelta(days=int(groups['day']) - 1)
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194 else: # year date
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195 return ret.replace(month=defaultmonth, day=defaultday)
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196 # year-, month-, or complete date
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197 if 'day' not in groups or groups['day'] is None:
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198 day = defaultday
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199 else:
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200 day = int(groups['day'])
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201 return date(sign * int(groups['year']),
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202 int(groups['month']) or defaultmonth, day)
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203 raise ISO8601Error('Unrecognised ISO 8601 date format: %r' % datestring)
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204
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205
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206 def date_isoformat(tdate, format=DATE_EXT_COMPLETE, yeardigits=4):
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207 '''
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208 Format date strings.
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209
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210 This method is just a wrapper around isodate.isostrf.strftime and uses
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211 Date-Extended-Complete as default format.
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212 '''
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213 return strftime(tdate, format, yeardigits)