Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/isodate/duration.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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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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220 newduration = Duration(years=self.years - other.years, |
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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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223 return newduration |
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224 try: |
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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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227 newduration.tdelta = self.tdelta - other |
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228 return newduration |
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229 except TypeError: |
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230 # looks like timedelta - other is not implemented |
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231 pass |
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232 return NotImplemented |
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233 |
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234 def __rsub__(self, other): |
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235 ''' |
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236 It is possible to subtract Duration objecs from date, datetime and |
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237 timedelta objects. |
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238 |
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239 TODO: there is some weird behaviour in date - timedelta ... |
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240 if timedelta has seconds or microseconds set, then |
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241 date - timedelta != date + (-timedelta) |
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242 for now we follow this behaviour to avoid surprises when mixing |
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243 timedeltas with Durations, but in case this ever changes in |
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244 the stdlib we can just do: |
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245 return -self + other |
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246 instead of all the current code |
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247 ''' |
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248 if isinstance(other, timedelta): |
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249 tmpdur = Duration() |
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250 tmpdur.tdelta = other |
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251 return tmpdur - self |
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252 try: |
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253 # check if other behaves like a date/datetime object |
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254 # does it have year, month, day and replace? |
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255 if (not(float(self.years).is_integer() and |
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256 float(self.months).is_integer())): |
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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) |