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annotate roundup/date.py @ 1096:fa7df238e2d4

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More cleaning up of configuration, and the "instance" -> "tracker" renaming.
author Richard Jones <richard@users.sourceforge.net>
date Tue, 10 Sep 2002 03:01:20 +0000
parents 854d45f8b745
children db787cef1385
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
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18 # $Id: date.py,v 1.27 2002-09-10 01:27:13 richard Exp $
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19
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20 __doc__ = """
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21 Date, time and time interval handling.
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22 """
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24 import time, re, calendar
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25 from i18n import _
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26
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27 class Date:
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28 '''
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29 As strings, date-and-time stamps are specified with the date in
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30 international standard format (yyyy-mm-dd) joined to the time
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31 (hh:mm:ss) by a period ("."). Dates in this form can be easily compared
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32 and are fairly readable when printed. An example of a valid stamp is
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33 "2000-06-24.13:03:59". We'll call this the "full date format". When
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34 Timestamp objects are printed as strings, they appear in the full date
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35 format with the time always given in GMT. The full date format is
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36 always exactly 19 characters long.
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37
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38 For user input, some partial forms are also permitted: the whole time
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39 or just the seconds may be omitted; and the whole date may be omitted
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40 or just the year may be omitted. If the time is given, the time is
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41 interpreted in the user's local time zone. The Date constructor takes
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42 care of these conversions. In the following examples, suppose that yyyy
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43 is the current year, mm is the current month, and dd is the current day
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44 of the month; and suppose that the user is on Eastern Standard Time.
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45
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46 "2000-04-17" means <Date 2000-04-17.00:00:00>
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47 "01-25" means <Date yyyy-01-25.00:00:00>
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48 "2000-04-17.03:45" means <Date 2000-04-17.08:45:00>
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49 "08-13.22:13" means <Date yyyy-08-14.03:13:00>
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50 "11-07.09:32:43" means <Date yyyy-11-07.14:32:43>
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51 "14:25" means <Date yyyy-mm-dd.19:25:00>
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52 "8:47:11" means <Date yyyy-mm-dd.13:47:11>
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53 "." means "right now"
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54
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55 The Date class should understand simple date expressions of the form
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56 stamp + interval and stamp - interval. When adding or subtracting
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57 intervals involving months or years, the components are handled
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58 separately. For example, when evaluating "2000-06-25 + 1m 10d", we
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59 first add one month to get 2000-07-25, then add 10 days to get
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60 2000-08-04 (rather than trying to decide whether 1m 10d means 38 or 40
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61 or 41 days).
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62
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63 Example usage:
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64 >>> Date(".")
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65 <Date 2000-06-26.00:34:02>
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66 >>> _.local(-5)
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67 "2000-06-25.19:34:02"
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68 >>> Date(". + 2d")
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69 <Date 2000-06-28.00:34:02>
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70 >>> Date("1997-04-17", -5)
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71 <Date 1997-04-17.00:00:00>
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72 >>> Date("01-25", -5)
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73 <Date 2000-01-25.00:00:00>
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74 >>> Date("08-13.22:13", -5)
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75 <Date 2000-08-14.03:13:00>
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76 >>> Date("14:25", -5)
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77 <Date 2000-06-25.19:25:00>
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78
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79 The date format 'yyyymmddHHMMSS' (year, month, day, hour,
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80 minute, second) is the serialisation format returned by the serialise()
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81 method, and is accepted as an argument on instatiation.
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82 '''
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83 def __init__(self, spec='.', offset=0):
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84 """Construct a date given a specification and a time zone offset.
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85
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86 'spec' is a full date or a partial form, with an optional
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87 added or subtracted interval. Or a date 9-tuple.
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88 'offset' is the local time zone offset from GMT in hours.
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89 """
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90 if type(spec) == type(''):
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91 self.set(spec, offset=offset)
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92 else:
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93 y,m,d,H,M,S,x,x,x = spec
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94 ts = calendar.timegm((y,m,d,H+offset,M,S,0,0,0))
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95 self.year, self.month, self.day, self.hour, self.minute, \
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96 self.second, x, x, x = time.gmtime(ts)
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97
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98 def addInterval(self, interval):
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99 ''' Add the interval to this date, returning the date tuple
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100 '''
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101 # do the basic calc
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102 sign = interval.sign
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103 year = self.year + sign * interval.year
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104 month = self.month + sign * interval.month
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105 day = self.day + sign * interval.day
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106 hour = self.hour + sign * interval.hour
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107 minute = self.minute + sign * interval.minute
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108 second = self.second + sign * interval.second
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109
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110 # now cope with under- and over-flow
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111 # first do the time
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112 while (second < 0 or second > 59 or minute < 0 or minute > 59 or
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113 hour < 0 or hour > 59):
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114 if second < 0: minute -= 1; second += 60
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115 elif second > 59: minute += 1; second -= 60
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116 if minute < 0: hour -= 1; minute += 60
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117 elif minute > 59: hour += 1; minute -= 60
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118 if hour < 0: day -= 1; hour += 24
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119 elif hour > 59: day += 1; hour -= 24
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120
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121 # fix up the month so we're within range
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122 while month < 1 or month > 12:
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123 if month < 1: year -= 1; month += 12
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124 if month > 12: year += 1; month -= 12
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125
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126 # now do the days, now that we know what month we're in
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127 mdays = calendar.mdays
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128 if month == 2 and calendar.isleap(year): month_days = 29
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129 else: month_days = mdays[month]
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130 while month < 1 or month > 12 or day < 0 or day > month_days:
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131 # now to day under/over
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132 if day < 0: month -= 1; day += month_days
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133 elif day > month_days: month += 1; day -= month_days
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134
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135 # possibly fix up the month so we're within range
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136 while month < 1 or month > 12:
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137 if month < 1: year -= 1; month += 12
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138 if month > 12: year += 1; month -= 12
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139
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140 # re-figure the number of days for this month
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141 if month == 2 and calendar.isleap(year): month_days = 29
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142 else: month_days = mdays[month]
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143 return (year, month, day, hour, minute, second, 0, 0, 0)
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144
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145 def applyInterval(self, interval):
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146 ''' Apply the interval to this date
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147 '''
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148 self.year, self.month, self.day, self.hour, self.minute, \
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149 self.second, x, x, x = self.addInterval(interval)
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150
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151 def __add__(self, interval):
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152 """Add an interval to this date to produce another date.
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153 """
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154 return Date(self.addInterval(interval))
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155
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156 # XXX deviates from spec to allow subtraction of dates as well
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157 def __sub__(self, other):
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158 """ Subtract:
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159 1. an interval from this date to produce another date.
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160 2. a date from this date to produce an interval.
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161 """
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162 if isinstance(other, Interval):
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163 other = Interval(other.get_tuple())
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164 other.sign *= -1
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165 return self.__add__(other)
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166
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167 assert isinstance(other, Date), 'May only subtract Dates or Intervals'
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168
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169 # TODO this code will fall over laughing if the dates cross
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170 # leap years, phases of the moon, ....
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171 a = calendar.timegm((self.year, self.month, self.day, self.hour,
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172 self.minute, self.second, 0, 0, 0))
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173 b = calendar.timegm((other.year, other.month, other.day,
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174 other.hour, other.minute, other.second, 0, 0, 0))
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175 diff = a - b
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176 if diff < 0:
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177 sign = 1
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178 diff = -diff
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179 else:
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180 sign = -1
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181 S = diff%60
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182 M = (diff/60)%60
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183 H = (diff/(60*60))%60
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184 if H>1: S = 0
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185 d = (diff/(24*60*60))%30
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186 if d>1: H = S = M = 0
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187 m = (diff/(30*24*60*60))%12
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188 if m>1: H = S = M = 0
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189 y = (diff/(365*24*60*60))
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190 if y>1: d = H = S = M = 0
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191 return Interval((y, m, d, H, M, S), sign=sign)
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192
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193 def __cmp__(self, other):
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194 """Compare this date to another date."""
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195 if other is None:
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196 return 1
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197 for attr in ('year', 'month', 'day', 'hour', 'minute', 'second'):
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198 if not hasattr(other, attr):
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199 return 1
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200 r = cmp(getattr(self, attr), getattr(other, attr))
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201 if r: return r
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202 return 0
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203
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204 def __str__(self):
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205 """Return this date as a string in the yyyy-mm-dd.hh:mm:ss format."""
206
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206 return '%4d-%02d-%02d.%02d:%02d:%02d'%(self.year, self.month, self.day,
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207 self.hour, self.minute, self.second)
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208
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209 def pretty(self):
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210 ''' print up the date date using a pretty format...
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211 '''
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212 str = time.strftime('%d %B %Y', (self.year, self.month,
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213 self.day, self.hour, self.minute, self.second, 0, 0, 0))
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214 if str[0] == '0': return ' ' + str[1:]
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215 return str
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216
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217 def set(self, spec, offset=0, date_re=re.compile(r'''
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218 (((?P<y>\d\d\d\d)-)?((?P<m>\d\d?)-(?P<d>\d\d?))?)? # yyyy-mm-dd
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219 (?P<n>\.)? # .
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220 (((?P<H>\d?\d):(?P<M>\d\d))?(:(?P<S>\d\d))?)? # hh:mm:ss
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221 (?P<o>.+)? # offset
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222 ''', re.VERBOSE), serialised_re=re.compile('''
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223 (?P<y>\d{4})(?P<m>\d{2})(?P<d>\d{2}) # yyyymmdd
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224 (?P<H>\d{2})(?P<M>\d{2})(?P<S>\d{2}) # HHMMSS
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225 ''', re.VERBOSE)):
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226 ''' set the date to the value in spec
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227 '''
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228 m = serialised_re.match(spec)
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229 if not m:
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230 m = date_re.match(spec)
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231 if not m:
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232 raise ValueError, _('Not a date spec: [[yyyy-]mm-dd].'
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233 '[[h]h:mm[:ss]][offset]')
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234
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235 info = m.groupdict()
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236
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237 # get the current date/time using the offset
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238 y,m,d,H,M,S,x,x,x = time.gmtime(time.time())
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239
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240 # override year, month, day parts
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241 if info['m'] is not None and info['d'] is not None:
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242 m = int(info['m'])
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243 d = int(info['d'])
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244 if info['y'] is not None: y = int(info['y'])
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245 H = M = S = 0
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246
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247 # override hour, minute, second parts
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248 if info['H'] is not None and info['M'] is not None:
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249 H = int(info['H']) - offset
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250 M = int(info['M'])
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251 S = 0
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252 if info['S'] is not None: S = int(info['S'])
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253
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254 # now handle the adjustment of hour
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255 ts = calendar.timegm((y,m,d,H,M,S,0,0,0))
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256 self.year, self.month, self.day, self.hour, self.minute, \
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257 self.second, x, x, x = time.gmtime(ts)
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258
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259 if info.get('o', None):
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260 self.applyInterval(Interval(info['o']))
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261
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262 def __repr__(self):
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263 return '<Date %s>'%self.__str__()
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264
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265 def local(self, offset):
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266 """Return this date as yyyy-mm-dd.hh:mm:ss in a local time zone."""
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267 t = (self.year, self.month, self.day, self.hour + offset, self.minute,
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268 self.second, 0, 0, 0)
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269 self.year, self.month, self.day, self.hour, self.minute, \
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270 self.second, x, x, x = time.gmtime(calendar.timegm(t))
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271
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272 def get_tuple(self):
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273 return (self.year, self.month, self.day, self.hour, self.minute,
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274 self.second, 0, 0, 0)
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275
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276 def serialise(self):
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277 return '%4d%02d%02d%02d%02d%02d'%(self.year, self.month,
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278 self.day, self.hour, self.minute, self.second)
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279
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280 class Interval:
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281 '''
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282 Date intervals are specified using the suffixes "y", "m", and "d". The
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283 suffix "w" (for "week") means 7 days. Time intervals are specified in
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284 hh:mm:ss format (the seconds may be omitted, but the hours and minutes
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285 may not).
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286
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287 "3y" means three years
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288 "2y 1m" means two years and one month
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289 "1m 25d" means one month and 25 days
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290 "2w 3d" means two weeks and three days
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291 "1d 2:50" means one day, two hours, and 50 minutes
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292 "14:00" means 14 hours
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293 "0:04:33" means four minutes and 33 seconds
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294
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295 Example usage:
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296 >>> Interval(" 3w 1 d 2:00")
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297 <Interval 22d 2:00>
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298 >>> Date(". + 2d") + Interval("- 3w")
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299 <Date 2000-06-07.00:34:02>
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300
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301 Intervals are added/subtracted in order of:
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302 seconds, minutes, hours, years, months, days
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303
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304 Calculations involving monts (eg '+2m') have no effect on days - only
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305 days (or over/underflow from hours/mins/secs) will do that, and
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306 days-per-month and leap years are accounted for. Leap seconds are not.
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307
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308 The interval format 'syyyymmddHHMMSS' (sign, year, month, day, hour,
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309 minute, second) is the serialisation format returned by the serialise()
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310 method, and is accepted as an argument on instatiation.
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311
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312 TODO: more examples, showing the order of addition operation
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313 '''
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314 def __init__(self, spec, sign=1):
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315 """Construct an interval given a specification."""
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316 if type(spec) == type(''):
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317 self.set(spec)
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318 else:
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319 if len(spec) == 7:
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320 self.sign, self.year, self.month, self.day, self.hour, \
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321 self.minute, self.second = spec
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322 else:
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323 # old, buggy spec form
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324 self.sign = sign
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325 self.year, self.month, self.day, self.hour, self.minute, \
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326 self.second = spec
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327
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328 def __cmp__(self, other):
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329 """Compare this interval to another interval."""
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330 if other is None:
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331 return 1
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332 for attr in ('year', 'month', 'day', 'hour', 'minute', 'second'):
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333 if not hasattr(other, attr):
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334 return 1
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335 r = cmp(getattr(self, attr), getattr(other, attr))
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336 if r: return r
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337 return 0
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338
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339 def __str__(self):
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340 """Return this interval as a string."""
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341 sign = {1:'+', -1:'-'}[self.sign]
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342 l = [sign]
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343 if self.year: l.append('%sy'%self.year)
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344 if self.month: l.append('%sm'%self.month)
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345 if self.day: l.append('%sd'%self.day)
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346 if self.second:
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347 l.append('%d:%02d:%02d'%(self.hour, self.minute, self.second))
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348 elif self.hour or self.minute:
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349 l.append('%d:%02d'%(self.hour, self.minute))
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350 return ' '.join(l)
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351
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352 def set(self, spec, interval_re=re.compile('''
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353 \s*(?P<s>[-+])? # + or -
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354 \s*((?P<y>\d+\s*)y)? # year
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355 \s*((?P<m>\d+\s*)m)? # month
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356 \s*((?P<w>\d+\s*)w)? # week
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357 \s*((?P<d>\d+\s*)d)? # day
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358 \s*(((?P<H>\d+):(?P<M>\d+))?(:(?P<S>\d+))?)? # time
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359 \s*''', re.VERBOSE), serialised_re=re.compile('''
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360 (?P<s>[+-])(?P<y>\d{4})(?P<m>\d{2})(?P<d>\d{2})
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361 (?P<H>\d{2})(?P<M>\d{2})(?P<S>\d{2})''', re.VERBOSE)):
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362 ''' set the date to the value in spec
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363 '''
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364 self.year = self.month = self.week = self.day = self.hour = \
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365 self.minute = self.second = 0
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366 self.sign = 1
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367 m = serialised_re.match(spec)
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368 if not m:
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369 m = interval_re.match(spec)
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370 if not m:
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371 raise ValueError, _('Not an interval spec: [+-] [#y] [#m] [#w] '
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372 '[#d] [[[H]H:MM]:SS]')
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373
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374 info = m.groupdict()
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375 for group, attr in {'y':'year', 'm':'month', 'w':'week', 'd':'day',
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376 'H':'hour', 'M':'minute', 'S':'second'}.items():
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377 if info.get(group, None) is not None:
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378 setattr(self, attr, int(info[group]))
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379
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380 if self.week:
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381 self.day = self.day + self.week*7
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382
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383 if info['s'] is not None:
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384 self.sign = {'+':1, '-':-1}[info['s']]
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385
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386 def __repr__(self):
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387 return '<Interval %s>'%self.__str__()
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388
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389 def pretty(self):
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390 ''' print up the date date using one of these nice formats..
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391 '''
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392 if self.year:
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393 if self.year == 1:
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394 return _('1 year')
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395 else:
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396 return _('%(number)s years')%{'number': self.year}
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397 elif self.month or self.day > 13:
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398 days = (self.month * 30) + self.day
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399 if days > 28:
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400 if int(days/30) > 1:
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401 s = _('%(number)s months')%{'number': int(days/30)}
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402 else:
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403 s = _('1 month')
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404 else:
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405 s = _('%(number)s weeks')%{'number': int(days/7)}
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406 elif self.day > 7:
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407 s = _('1 week')
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408 elif self.day > 1:
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409 s = _('%(number)s days')%{'number': self.day}
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410 elif self.day == 1 or self.hour > 12:
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411 if self.sign > 0:
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412 return _('tomorrow')
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413 else:
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414 return _('yesterday')
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415 elif self.hour > 1:
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416 s = _('%(number)s hours')%{'number': self.hour}
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417 elif self.hour == 1:
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418 if self.minute < 15:
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419 s = _('an hour')
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420 elif self.minute/15 == 2:
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421 s = _('1 1/2 hours')
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422 else:
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423 s = _('1 %(number)s/4 hours')%{'number': self.minute/15}
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424 elif self.minute < 1:
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diff changeset
425 if self.sign > 0:
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426 return _('in a moment')
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427 else:
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parents: 585
diff changeset
428 return _('just now')
7dd13fd5d8ea fixed some problems in date calculations
Richard Jones <richard@users.sourceforge.net>
parents: 585
diff changeset
429 elif self.minute == 1:
7dd13fd5d8ea fixed some problems in date calculations
Richard Jones <richard@users.sourceforge.net>
parents: 585
diff changeset
430 s = _('1 minute')
7dd13fd5d8ea fixed some problems in date calculations
Richard Jones <richard@users.sourceforge.net>
parents: 585
diff changeset
431 elif self.minute < 15:
7dd13fd5d8ea fixed some problems in date calculations
Richard Jones <richard@users.sourceforge.net>
parents: 585
diff changeset
432 s = _('%(number)s minutes')%{'number': self.minute}
7dd13fd5d8ea fixed some problems in date calculations
Richard Jones <richard@users.sourceforge.net>
parents: 585
diff changeset
433 elif int(self.minute/15) == 2:
7dd13fd5d8ea fixed some problems in date calculations
Richard Jones <richard@users.sourceforge.net>
parents: 585
diff changeset
434 s = _('1/2 an hour')
7dd13fd5d8ea fixed some problems in date calculations
Richard Jones <richard@users.sourceforge.net>
parents: 585
diff changeset
435 else:
7dd13fd5d8ea fixed some problems in date calculations
Richard Jones <richard@users.sourceforge.net>
parents: 585
diff changeset
436 s = _('%(number)s/4 hour')%{'number': int(self.minute/15)}
7dd13fd5d8ea fixed some problems in date calculations
Richard Jones <richard@users.sourceforge.net>
parents: 585
diff changeset
437 return s
25
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
438
47
34491d9b91a0 Storing only marshallable data in the db - no nasty pickled class references.
Richard Jones <richard@users.sourceforge.net>
parents: 26
diff changeset
439 def get_tuple(self):
964
832d1209aaa2 Preparing to turn back on link/unlink journal events.
Richard Jones <richard@users.sourceforge.net>
parents: 890
diff changeset
440 return (self.sign, self.year, self.month, self.day, self.hour,
832d1209aaa2 Preparing to turn back on link/unlink journal events.
Richard Jones <richard@users.sourceforge.net>
parents: 890
diff changeset
441 self.minute, self.second)
832d1209aaa2 Preparing to turn back on link/unlink journal events.
Richard Jones <richard@users.sourceforge.net>
parents: 890
diff changeset
442
832d1209aaa2 Preparing to turn back on link/unlink journal events.
Richard Jones <richard@users.sourceforge.net>
parents: 890
diff changeset
443 def serialise(self):
832d1209aaa2 Preparing to turn back on link/unlink journal events.
Richard Jones <richard@users.sourceforge.net>
parents: 890
diff changeset
444 return '%s%4d%02d%02d%02d%02d%02d'%(self.sign, self.year, self.month,
832d1209aaa2 Preparing to turn back on link/unlink journal events.
Richard Jones <richard@users.sourceforge.net>
parents: 890
diff changeset
445 self.day, self.hour, self.minute, self.second)
47
34491d9b91a0 Storing only marshallable data in the db - no nasty pickled class references.
Richard Jones <richard@users.sourceforge.net>
parents: 26
diff changeset
446
25
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
447
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
448 def test():
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
449 intervals = (" 3w 1 d 2:00", " + 2d", "3w")
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
450 for interval in intervals:
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
451 print '>>> Interval("%s")'%interval
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
452 print `Interval(interval)`
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
453
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
454 dates = (".", "2000-06-25.19:34:02", ". + 2d", "1997-04-17", "01-25",
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
455 "08-13.22:13", "14:25")
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
456 for date in dates:
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
457 print '>>> Date("%s")'%date
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
458 print `Date(date)`
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
459
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
460 sums = ((". + 2d", "3w"), (".", " 3w 1 d 2:00"))
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
461 for date, interval in sums:
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
462 print '>>> Date("%s") + Interval("%s")'%(date, interval)
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
463 print `Date(date) + Interval(interval)`
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
464
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
465 if __name__ == '__main__':
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
466 test()
4cf1daf2f2eb More Grande Splite
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
467
127
0791d13baea7 Added vim command to all source so that we don't get no steenkin' tabs :)
Richard Jones <richard@users.sourceforge.net>
parents: 75
diff changeset
468 # vim: set filetype=python ts=4 sw=4 et si
Roundup Issue Tracker: http://roundup-tracker.org/