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annotate planemo/lib/python3.7/site-packages/dateutil/parser/isoparser.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 # -*- coding: utf-8 -*-
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2 """
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3 This module offers a parser for ISO-8601 strings
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4
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5 It is intended to support all valid date, time and datetime formats per the
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6 ISO-8601 specification.
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7
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8 ..versionadded:: 2.7.0
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9 """
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10 from datetime import datetime, timedelta, time, date
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11 import calendar
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12 from dateutil import tz
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13
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14 from functools import wraps
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15
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16 import re
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17 import six
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18
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19 __all__ = ["isoparse", "isoparser"]
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20
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21
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22 def _takes_ascii(f):
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23 @wraps(f)
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24 def func(self, str_in, *args, **kwargs):
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25 # If it's a stream, read the whole thing
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26 str_in = getattr(str_in, 'read', lambda: str_in)()
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27
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28 # If it's unicode, turn it into bytes, since ISO-8601 only covers ASCII
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29 if isinstance(str_in, six.text_type):
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30 # ASCII is the same in UTF-8
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31 try:
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32 str_in = str_in.encode('ascii')
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33 except UnicodeEncodeError as e:
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34 msg = 'ISO-8601 strings should contain only ASCII characters'
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35 six.raise_from(ValueError(msg), e)
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36
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37 return f(self, str_in, *args, **kwargs)
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38
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39 return func
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40
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41
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42 class isoparser(object):
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43 def __init__(self, sep=None):
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44 """
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45 :param sep:
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46 A single character that separates date and time portions. If
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47 ``None``, the parser will accept any single character.
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48 For strict ISO-8601 adherence, pass ``'T'``.
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49 """
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50 if sep is not None:
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51 if (len(sep) != 1 or ord(sep) >= 128 or sep in '0123456789'):
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52 raise ValueError('Separator must be a single, non-numeric ' +
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53 'ASCII character')
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54
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55 sep = sep.encode('ascii')
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56
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57 self._sep = sep
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58
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59 @_takes_ascii
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60 def isoparse(self, dt_str):
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61 """
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62 Parse an ISO-8601 datetime string into a :class:`datetime.datetime`.
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63
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64 An ISO-8601 datetime string consists of a date portion, followed
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65 optionally by a time portion - the date and time portions are separated
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66 by a single character separator, which is ``T`` in the official
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67 standard. Incomplete date formats (such as ``YYYY-MM``) may *not* be
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68 combined with a time portion.
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69
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70 Supported date formats are:
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71
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72 Common:
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73
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74 - ``YYYY``
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75 - ``YYYY-MM`` or ``YYYYMM``
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76 - ``YYYY-MM-DD`` or ``YYYYMMDD``
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77
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78 Uncommon:
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79
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80 - ``YYYY-Www`` or ``YYYYWww`` - ISO week (day defaults to 0)
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81 - ``YYYY-Www-D`` or ``YYYYWwwD`` - ISO week and day
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82
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83 The ISO week and day numbering follows the same logic as
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84 :func:`datetime.date.isocalendar`.
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85
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86 Supported time formats are:
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87
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88 - ``hh``
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89 - ``hh:mm`` or ``hhmm``
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90 - ``hh:mm:ss`` or ``hhmmss``
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91 - ``hh:mm:ss.ssssss`` (Up to 6 sub-second digits)
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92
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93 Midnight is a special case for `hh`, as the standard supports both
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94 00:00 and 24:00 as a representation. The decimal separator can be
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95 either a dot or a comma.
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96
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97
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98 .. caution::
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99
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100 Support for fractional components other than seconds is part of the
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101 ISO-8601 standard, but is not currently implemented in this parser.
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102
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103 Supported time zone offset formats are:
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104
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105 - `Z` (UTC)
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106 - `±HH:MM`
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107 - `±HHMM`
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108 - `±HH`
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109
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110 Offsets will be represented as :class:`dateutil.tz.tzoffset` objects,
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111 with the exception of UTC, which will be represented as
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112 :class:`dateutil.tz.tzutc`. Time zone offsets equivalent to UTC (such
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113 as `+00:00`) will also be represented as :class:`dateutil.tz.tzutc`.
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114
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115 :param dt_str:
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116 A string or stream containing only an ISO-8601 datetime string
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117
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118 :return:
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119 Returns a :class:`datetime.datetime` representing the string.
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120 Unspecified components default to their lowest value.
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121
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122 .. warning::
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123
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124 As of version 2.7.0, the strictness of the parser should not be
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125 considered a stable part of the contract. Any valid ISO-8601 string
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126 that parses correctly with the default settings will continue to
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127 parse correctly in future versions, but invalid strings that
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128 currently fail (e.g. ``2017-01-01T00:00+00:00:00``) are not
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129 guaranteed to continue failing in future versions if they encode
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130 a valid date.
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131
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132 .. versionadded:: 2.7.0
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133 """
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134 components, pos = self._parse_isodate(dt_str)
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135
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136 if len(dt_str) > pos:
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137 if self._sep is None or dt_str[pos:pos + 1] == self._sep:
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138 components += self._parse_isotime(dt_str[pos + 1:])
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139 else:
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140 raise ValueError('String contains unknown ISO components')
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141
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142 if len(components) > 3 and components[3] == 24:
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143 components[3] = 0
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144 return datetime(*components) + timedelta(days=1)
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145
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146 return datetime(*components)
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147
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148 @_takes_ascii
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149 def parse_isodate(self, datestr):
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150 """
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151 Parse the date portion of an ISO string.
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152
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153 :param datestr:
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154 The string portion of an ISO string, without a separator
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155
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156 :return:
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157 Returns a :class:`datetime.date` object
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158 """
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159 components, pos = self._parse_isodate(datestr)
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160 if pos < len(datestr):
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161 raise ValueError('String contains unknown ISO ' +
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162 'components: {}'.format(datestr))
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163 return date(*components)
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164
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165 @_takes_ascii
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166 def parse_isotime(self, timestr):
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167 """
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168 Parse the time portion of an ISO string.
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169
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170 :param timestr:
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171 The time portion of an ISO string, without a separator
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172
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173 :return:
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174 Returns a :class:`datetime.time` object
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175 """
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176 components = self._parse_isotime(timestr)
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177 if components[0] == 24:
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178 components[0] = 0
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179 return time(*components)
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180
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181 @_takes_ascii
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182 def parse_tzstr(self, tzstr, zero_as_utc=True):
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183 """
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184 Parse a valid ISO time zone string.
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185
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186 See :func:`isoparser.isoparse` for details on supported formats.
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187
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188 :param tzstr:
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189 A string representing an ISO time zone offset
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190
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191 :param zero_as_utc:
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192 Whether to return :class:`dateutil.tz.tzutc` for zero-offset zones
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193
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194 :return:
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195 Returns :class:`dateutil.tz.tzoffset` for offsets and
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196 :class:`dateutil.tz.tzutc` for ``Z`` and (if ``zero_as_utc`` is
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197 specified) offsets equivalent to UTC.
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198 """
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199 return self._parse_tzstr(tzstr, zero_as_utc=zero_as_utc)
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200
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201 # Constants
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202 _DATE_SEP = b'-'
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203 _TIME_SEP = b':'
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204 _FRACTION_REGEX = re.compile(b'[\\.,]([0-9]+)')
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205
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206 def _parse_isodate(self, dt_str):
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207 try:
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208 return self._parse_isodate_common(dt_str)
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209 except ValueError:
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210 return self._parse_isodate_uncommon(dt_str)
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211
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212 def _parse_isodate_common(self, dt_str):
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213 len_str = len(dt_str)
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214 components = [1, 1, 1]
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215
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216 if len_str < 4:
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217 raise ValueError('ISO string too short')
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218
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219 # Year
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220 components[0] = int(dt_str[0:4])
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221 pos = 4
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222 if pos >= len_str:
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223 return components, pos
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224
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225 has_sep = dt_str[pos:pos + 1] == self._DATE_SEP
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226 if has_sep:
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227 pos += 1
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228
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229 # Month
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230 if len_str - pos < 2:
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231 raise ValueError('Invalid common month')
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232
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233 components[1] = int(dt_str[pos:pos + 2])
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234 pos += 2
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235
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236 if pos >= len_str:
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237 if has_sep:
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238 return components, pos
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239 else:
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240 raise ValueError('Invalid ISO format')
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241
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242 if has_sep:
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243 if dt_str[pos:pos + 1] != self._DATE_SEP:
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244 raise ValueError('Invalid separator in ISO string')
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245 pos += 1
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246
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247 # Day
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248 if len_str - pos < 2:
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249 raise ValueError('Invalid common day')
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250 components[2] = int(dt_str[pos:pos + 2])
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251 return components, pos + 2
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252
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253 def _parse_isodate_uncommon(self, dt_str):
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254 if len(dt_str) < 4:
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255 raise ValueError('ISO string too short')
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256
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257 # All ISO formats start with the year
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258 year = int(dt_str[0:4])
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259
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260 has_sep = dt_str[4:5] == self._DATE_SEP
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261
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262 pos = 4 + has_sep # Skip '-' if it's there
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263 if dt_str[pos:pos + 1] == b'W':
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parents:
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264 # YYYY-?Www-?D?
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265 pos += 1
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266 weekno = int(dt_str[pos:pos + 2])
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267 pos += 2
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268
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269 dayno = 1
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diff changeset
270 if len(dt_str) > pos:
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271 if (dt_str[pos:pos + 1] == self._DATE_SEP) != has_sep:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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272 raise ValueError('Inconsistent use of dash separator')
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273
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274 pos += has_sep
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275
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276 dayno = int(dt_str[pos:pos + 1])
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277 pos += 1
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278
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279 base_date = self._calculate_weekdate(year, weekno, dayno)
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280 else:
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281 # YYYYDDD or YYYY-DDD
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282 if len(dt_str) - pos < 3:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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283 raise ValueError('Invalid ordinal day')
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284
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285 ordinal_day = int(dt_str[pos:pos + 3])
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286 pos += 3
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287
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288 if ordinal_day < 1 or ordinal_day > (365 + calendar.isleap(year)):
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289 raise ValueError('Invalid ordinal day' +
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290 ' {} for year {}'.format(ordinal_day, year))
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291
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292 base_date = date(year, 1, 1) + timedelta(days=ordinal_day - 1)
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293
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294 components = [base_date.year, base_date.month, base_date.day]
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295 return components, pos
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296
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297 def _calculate_weekdate(self, year, week, day):
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298 """
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299 Calculate the day of corresponding to the ISO year-week-day calendar.
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300
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301 This function is effectively the inverse of
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302 :func:`datetime.date.isocalendar`.
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303
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304 :param year:
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305 The year in the ISO calendar
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306
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307 :param week:
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308 The week in the ISO calendar - range is [1, 53]
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309
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310 :param day:
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311 The day in the ISO calendar - range is [1 (MON), 7 (SUN)]
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312
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313 :return:
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314 Returns a :class:`datetime.date`
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315 """
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316 if not 0 < week < 54:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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317 raise ValueError('Invalid week: {}'.format(week))
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318
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319 if not 0 < day < 8: # Range is 1-7
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320 raise ValueError('Invalid weekday: {}'.format(day))
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321
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322 # Get week 1 for the specific year:
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323 jan_4 = date(year, 1, 4) # Week 1 always has January 4th in it
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324 week_1 = jan_4 - timedelta(days=jan_4.isocalendar()[2] - 1)
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325
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326 # Now add the specific number of weeks and days to get what we want
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327 week_offset = (week - 1) * 7 + (day - 1)
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328 return week_1 + timedelta(days=week_offset)
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329
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330 def _parse_isotime(self, timestr):
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331 len_str = len(timestr)
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332 components = [0, 0, 0, 0, None]
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333 pos = 0
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334 comp = -1
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335
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336 if len(timestr) < 2:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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337 raise ValueError('ISO time too short')
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338
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339 has_sep = len_str >= 3 and timestr[2:3] == self._TIME_SEP
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340
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341 while pos < len_str and comp < 5:
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342 comp += 1
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343
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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344 if timestr[pos:pos + 1] in b'-+Zz':
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345 # Detect time zone boundary
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346 components[-1] = self._parse_tzstr(timestr[pos:])
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347 pos = len_str
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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348 break
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349
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350 if comp < 3:
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351 # Hour, minute, second
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352 components[comp] = int(timestr[pos:pos + 2])
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353 pos += 2
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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354 if (has_sep and pos < len_str and
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355 timestr[pos:pos + 1] == self._TIME_SEP):
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356 pos += 1
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diff changeset
357
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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358 if comp == 3:
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diff changeset
359 # Fraction of a second
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360 frac = self._FRACTION_REGEX.match(timestr[pos:])
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
361 if not frac:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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362 continue
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363
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364 us_str = frac.group(1)[:6] # Truncate to microseconds
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365 components[comp] = int(us_str) * 10**(6 - len(us_str))
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366 pos += len(frac.group())
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367
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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368 if pos < len_str:
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369 raise ValueError('Unused components in ISO string')
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diff changeset
370
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371 if components[0] == 24:
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diff changeset
372 # Standard supports 00:00 and 24:00 as representations of midnight
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diff changeset
373 if any(component != 0 for component in components[1:4]):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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374 raise ValueError('Hour may only be 24 at 24:00:00.000')
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parents:
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375
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
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376 return components
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377
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378 def _parse_tzstr(self, tzstr, zero_as_utc=True):
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diff changeset
379 if tzstr == b'Z' or tzstr == b'z':
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diff changeset
380 return tz.UTC
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diff changeset
381
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
382 if len(tzstr) not in {3, 5, 6}:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
383 raise ValueError('Time zone offset must be 1, 3, 5 or 6 characters')
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parents:
diff changeset
384
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
385 if tzstr[0:1] == b'-':
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diff changeset
386 mult = -1
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
387 elif tzstr[0:1] == b'+':
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388 mult = 1
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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389 else:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
390 raise ValueError('Time zone offset requires sign')
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parents:
diff changeset
391
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392 hours = int(tzstr[1:3])
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parents:
diff changeset
393 if len(tzstr) == 3:
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394 minutes = 0
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guerler
parents:
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395 else:
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guerler
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396 minutes = int(tzstr[(4 if tzstr[3:4] == self._TIME_SEP else 3):])
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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397
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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398 if zero_as_utc and hours == 0 and minutes == 0:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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399 return tz.UTC
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guerler
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400 else:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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401 if minutes > 59:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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402 raise ValueError('Invalid minutes in time zone offset')
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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403
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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404 if hours > 23:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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405 raise ValueError('Invalid hours in time zone offset')
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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406
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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407 return tz.tzoffset(None, mult * (hours * 60 + minutes) * 60)
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guerler
parents:
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408
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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409
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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410 DEFAULT_ISOPARSER = isoparser()
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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411 isoparse = DEFAULT_ISOPARSER.isoparse