Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/isodate/duration.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 defines a Duration class.
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29
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30 The class Duration allows to define durations in years and months and can be
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31 used as limited replacement for timedelta objects.
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32 '''
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33 from datetime import timedelta
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34 from decimal import Decimal, ROUND_FLOOR
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35
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36
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37 def fquotmod(val, low, high):
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38 '''
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39 A divmod function with boundaries.
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40
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41 '''
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42 # assumes that all the maths is done with Decimals.
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43 # divmod for Decimal uses truncate instead of floor as builtin
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44 # divmod, so we have to do it manually here.
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45 a, b = val - low, high - low
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46 div = (a / b).to_integral(ROUND_FLOOR)
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47 mod = a - div * b
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48 # if we were not usig Decimal, it would look like this.
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49 # div, mod = divmod(val - low, high - low)
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50 mod += low
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51 return int(div), mod
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52
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53
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54 def max_days_in_month(year, month):
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55 '''
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56 Determines the number of days of a specific month in a specific year.
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57 '''
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58 if month in (1, 3, 5, 7, 8, 10, 12):
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59 return 31
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60 if month in (4, 6, 9, 11):
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61 return 30
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62 if ((year % 400) == 0) or ((year % 100) != 0) and ((year % 4) == 0):
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63 return 29
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64 return 28
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65
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66
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67 class Duration(object):
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68 '''
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69 A class which represents a duration.
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70
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71 The difference to datetime.timedelta is, that this class handles also
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72 differences given in years and months.
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73 A Duration treats differences given in year, months separately from all
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74 other components.
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75
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76 A Duration can be used almost like any timedelta object, however there
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77 are some restrictions:
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78 * It is not really possible to compare Durations, because it is unclear,
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79 whether a duration of 1 year is bigger than 365 days or not.
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80 * Equality is only tested between the two (year, month vs. timedelta)
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81 basic components.
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82
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83 A Duration can also be converted into a datetime object, but this requires
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84 a start date or an end date.
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85
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86 The algorithm to add a duration to a date is defined at
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87 http://www.w3.org/TR/xmlschema-2/#adding-durations-to-dateTimes
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88 '''
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89
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90 def __init__(self, days=0, seconds=0, microseconds=0, milliseconds=0,
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91 minutes=0, hours=0, weeks=0, months=0, years=0):
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92 '''
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93 Initialise this Duration instance with the given parameters.
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94 '''
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95 if not isinstance(months, Decimal):
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96 months = Decimal(str(months))
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97 if not isinstance(years, Decimal):
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98 years = Decimal(str(years))
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99 self.months = months
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100 self.years = years
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101 self.tdelta = timedelta(days, seconds, microseconds, milliseconds,
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102 minutes, hours, weeks)
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103
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104 def __getstate__(self):
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105 return self.__dict__
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106
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107 def __setstate__(self, state):
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108 self.__dict__.update(state)
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109
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110 def __getattr__(self, name):
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111 '''
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112 Provide direct access to attributes of included timedelta instance.
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113 '''
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114 return getattr(self.tdelta, name)
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115
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116 def __str__(self):
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117 '''
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118 Return a string representation of this duration similar to timedelta.
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119 '''
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120 params = []
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121 if self.years:
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122 params.append('%d years' % self.years)
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123 if self.months:
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124 fmt = "%d months"
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125 if self.months <= 1:
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126 fmt = "%d month"
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127 params.append(fmt % self.months)
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128 params.append(str(self.tdelta))
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129 return ', '.join(params)
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130
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131 def __repr__(self):
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132 '''
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133 Return a string suitable for repr(x) calls.
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134 '''
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135 return "%s.%s(%d, %d, %d, years=%d, months=%d)" % (
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136 self.__class__.__module__, self.__class__.__name__,
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137 self.tdelta.days, self.tdelta.seconds,
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138 self.tdelta.microseconds, self.years, self.months)
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139
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140 def __hash__(self):
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141 '''
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142 Return a hash of this instance so that it can be used in, for
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143 example, dicts and sets.
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144 '''
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145 return hash((self.tdelta, self.months, self.years))
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146
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147 def __neg__(self):
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148 """
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149 A simple unary minus.
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150
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151 Returns a new Duration instance with all it's negated.
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152 """
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153 negduration = Duration(years=-self.years, months=-self.months)
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154 negduration.tdelta = -self.tdelta
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155 return negduration
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156
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157 def __add__(self, other):
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158 '''
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159 Durations can be added with Duration, timedelta, date and datetime
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160 objects.
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161 '''
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162 if isinstance(other, Duration):
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163 newduration = Duration(years=self.years + other.years,
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164 months=self.months + other.months)
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165 newduration.tdelta = self.tdelta + other.tdelta
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166 return newduration
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167 try:
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168 # try anything that looks like a date or datetime
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169 # 'other' has attributes year, month, day
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170 # and relies on 'timedelta + other' being implemented
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171 if (not(float(self.years).is_integer() and
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172 float(self.months).is_integer())):
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173 raise ValueError('fractional years or months not supported'
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174 ' for date calculations')
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175 newmonth = other.month + self.months
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176 carry, newmonth = fquotmod(newmonth, 1, 13)
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177 newyear = other.year + self.years + carry
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178 maxdays = max_days_in_month(newyear, newmonth)
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179 if other.day > maxdays:
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180 newday = maxdays
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181 else:
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182 newday = other.day
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183 newdt = other.replace(year=newyear, month=newmonth, day=newday)
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184 # does a timedelta + date/datetime
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185 return self.tdelta + newdt
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186 except AttributeError:
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187 # other probably was not a date/datetime compatible object
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188 pass
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189 try:
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190 # try if other is a timedelta
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191 # relies on timedelta + timedelta supported
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192 newduration = Duration(years=self.years, months=self.months)
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193 newduration.tdelta = self.tdelta + other
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194 return newduration
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195 except AttributeError:
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196 # ignore ... other probably was not a timedelta compatible object
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197 pass
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198 # we have tried everything .... return a NotImplemented
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199 return NotImplemented
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200
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201 __radd__ = __add__
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202
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203 def __mul__(self, other):
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204 if isinstance(other, int):
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205 newduration = Duration(
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206 years=self.years * other,
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207 months=self.months * other)
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208 newduration.tdelta = self.tdelta * other
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209 return newduration
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210 return NotImplemented
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211
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212 __rmul__ = __mul__
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213
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214 def __sub__(self, other):
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215 '''
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216 It is possible to subtract Duration and timedelta objects from Duration
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217 objects.
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218 '''
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219 if isinstance(other, Duration):
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diff changeset
220 newduration = Duration(years=self.years - other.years,
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parents:
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221 months=self.months - other.months)
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222 newduration.tdelta = self.tdelta - other.tdelta
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diff changeset
223 return newduration
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224 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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225 # do maths with our timedelta object ....
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226 newduration = Duration(years=self.years, months=self.months)
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parents:
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227 newduration.tdelta = self.tdelta - other
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228 return newduration
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diff changeset
229 except TypeError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
230 # looks like timedelta - other is not implemented
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diff changeset
231 pass
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232 return NotImplemented
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diff changeset
233
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diff changeset
234 def __rsub__(self, other):
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parents:
diff changeset
235 '''
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diff changeset
236 It is possible to subtract Duration objecs from date, datetime and
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parents:
diff changeset
237 timedelta objects.
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diff changeset
238
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
239 TODO: there is some weird behaviour in date - timedelta ...
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diff changeset
240 if timedelta has seconds or microseconds set, then
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parents:
diff changeset
241 date - timedelta != date + (-timedelta)
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parents:
diff changeset
242 for now we follow this behaviour to avoid surprises when mixing
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parents:
diff changeset
243 timedeltas with Durations, but in case this ever changes in
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diff changeset
244 the stdlib we can just do:
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245 return -self + other
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diff changeset
246 instead of all the current code
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247 '''
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parents:
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248 if isinstance(other, timedelta):
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diff changeset
249 tmpdur = Duration()
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250 tmpdur.tdelta = other
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251 return tmpdur - self
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diff changeset
252 try:
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diff changeset
253 # check if other behaves like a date/datetime object
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parents:
diff changeset
254 # does it have year, month, day and replace?
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parents:
diff changeset
255 if (not(float(self.years).is_integer() and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
256 float(self.months).is_integer())):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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257 raise ValueError('fractional years or months not supported'
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258 ' for date calculations')
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259 newmonth = other.month - self.months
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260 carry, newmonth = fquotmod(newmonth, 1, 13)
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261 newyear = other.year - self.years + carry
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262 maxdays = max_days_in_month(newyear, newmonth)
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263 if other.day > maxdays:
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264 newday = maxdays
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265 else:
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266 newday = other.day
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267 newdt = other.replace(year=newyear, month=newmonth, day=newday)
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268 return newdt - self.tdelta
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269 except AttributeError:
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270 # other probably was not compatible with data/datetime
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271 pass
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272 return NotImplemented
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273
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274 def __eq__(self, other):
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275 '''
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276 If the years, month part and the timedelta part are both equal, then
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277 the two Durations are considered equal.
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278 '''
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279 if isinstance(other, Duration):
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280 if (((self.years * 12 + self.months) ==
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281 (other.years * 12 + other.months) and
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282 self.tdelta == other.tdelta)):
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283 return True
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284 return False
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285 # check if other con be compared against timedelta object
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286 # will raise an AssertionError when optimisation is off
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287 if self.years == 0 and self.months == 0:
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288 return self.tdelta == other
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289 return False
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290
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291 def __ne__(self, other):
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292 '''
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293 If the years, month part or the timedelta part is not equal, then
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294 the two Durations are considered not equal.
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295 '''
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296 if isinstance(other, Duration):
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297 if (((self.years * 12 + self.months) !=
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298 (other.years * 12 + other.months) or
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299 self.tdelta != other.tdelta)):
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300 return True
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301 return False
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302 # check if other can be compared against timedelta object
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303 # will raise an AssertionError when optimisation is off
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304 if self.years == 0 and self.months == 0:
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305 return self.tdelta != other
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306 return True
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307
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308 def totimedelta(self, start=None, end=None):
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309 '''
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310 Convert this duration into a timedelta object.
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311
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312 This method requires a start datetime or end datetimem, but raises
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313 an exception if both are given.
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314 '''
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315 if start is None and end is None:
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316 raise ValueError("start or end required")
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317 if start is not None and end is not None:
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318 raise ValueError("only start or end allowed")
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319 if start is not None:
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320 return (start + self) - start
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321 return end - (end - self)