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annotate roundup/date.py @ 218:877042bf42e8

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oops ;)
author Richard Jones <richard@users.sourceforge.net>
date Wed, 08 Aug 2001 00:08:03 +0000
parents 18134bffab37
children 1d1848c99abe
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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 1.10 2001-08-07 00:24:42 richard Exp $
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19
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20 import time, re, calendar
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21
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22 class Date:
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23 '''
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24 As strings, date-and-time stamps are specified with the date in
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25 international standard format (yyyy-mm-dd) joined to the time
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26 (hh:mm:ss) by a period ("."). Dates in this form can be easily compared
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27 and are fairly readable when printed. An example of a valid stamp is
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28 "2000-06-24.13:03:59". We'll call this the "full date format". When
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29 Timestamp objects are printed as strings, they appear in the full date
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30 format with the time always given in GMT. The full date format is
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31 always exactly 19 characters long.
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32
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33 For user input, some partial forms are also permitted: the whole time
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34 or just the seconds may be omitted; and the whole date may be omitted
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35 or just the year may be omitted. If the time is given, the time is
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36 interpreted in the user's local time zone. The Date constructor takes
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37 care of these conversions. In the following examples, suppose that yyyy
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38 is the current year, mm is the current month, and dd is the current day
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39 of the month; and suppose that the user is on Eastern Standard Time.
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40
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41 "2000-04-17" means <Date 2000-04-17.00:00:00>
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42 "01-25" means <Date yyyy-01-25.00:00:00>
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43 "2000-04-17.03:45" means <Date 2000-04-17.08:45:00>
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44 "08-13.22:13" means <Date yyyy-08-14.03:13:00>
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45 "11-07.09:32:43" means <Date yyyy-11-07.14:32:43>
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46 "14:25" means <Date yyyy-mm-dd.19:25:00>
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47 "8:47:11" means <Date yyyy-mm-dd.13:47:11>
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48 "." means "right now"
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49
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50 The Date class should understand simple date expressions of the form
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51 stamp + interval and stamp - interval. When adding or subtracting
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52 intervals involving months or years, the components are handled
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53 separately. For example, when evaluating "2000-06-25 + 1m 10d", we
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54 first add one month to get 2000-07-25, then add 10 days to get
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55 2000-08-04 (rather than trying to decide whether 1m 10d means 38 or 40
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56 or 41 days).
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57
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58 Example usage:
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59 >>> Date(".")
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60 <Date 2000-06-26.00:34:02>
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61 >>> _.local(-5)
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62 "2000-06-25.19:34:02"
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63 >>> Date(". + 2d")
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64 <Date 2000-06-28.00:34:02>
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65 >>> Date("1997-04-17", -5)
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66 <Date 1997-04-17.00:00:00>
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67 >>> Date("01-25", -5)
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68 <Date 2000-01-25.00:00:00>
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69 >>> Date("08-13.22:13", -5)
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70 <Date 2000-08-14.03:13:00>
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71 >>> Date("14:25", -5)
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72 <Date 2000-06-25.19:25:00>
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73 '''
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74 isDate = 1
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75
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76 def __init__(self, spec='.', offset=0):
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77 """Construct a date given a specification and a time zone offset.
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78
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79 'spec' is a full date or a partial form, with an optional
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80 added or subtracted interval. Or a date 9-tuple.
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81 'offset' is the local time zone offset from GMT in hours.
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82 """
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83 if type(spec) == type(''):
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84 self.set(spec, offset=offset)
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85 else:
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86 y,m,d,H,M,S,x,x,x = spec
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87 ts = calendar.timegm((y,m,d,H+offset,M,S,0,0,0))
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88 self.year, self.month, self.day, self.hour, self.minute, \
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89 self.second, x, x, x = time.gmtime(ts)
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90
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91 def applyInterval(self, interval):
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92 ''' Apply the interval to this date
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93 '''
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94 t = (self.year + interval.year,
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95 self.month + interval.month,
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96 self.day + interval.day,
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97 self.hour + interval.hour,
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98 self.minute + interval.minute,
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99 self.second + interval.second, 0, 0, 0)
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100 self.year, self.month, self.day, self.hour, self.minute, \
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101 self.second, x, x, x = time.gmtime(calendar.timegm(t))
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102
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103 def __add__(self, other):
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104 """Add an interval to this date to produce another date."""
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105 t = (self.year + other.sign * other.year,
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106 self.month + other.sign * other.month,
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107 self.day + other.sign * other.day,
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108 self.hour + other.sign * other.hour,
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109 self.minute + other.sign * other.minute,
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110 self.second + other.sign * other.second, 0, 0, 0)
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111 return Date(time.gmtime(calendar.timegm(t)))
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112
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113 # XXX deviates from spec to allow subtraction of dates as well
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114 def __sub__(self, other):
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115 """ Subtract:
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116 1. an interval from this date to produce another date.
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117 2. a date from this date to produce an interval.
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118 """
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119 if other.isDate:
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120 # TODO this code will fall over laughing if the dates cross
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121 # leap years, phases of the moon, ....
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122 a = calendar.timegm((self.year, self.month, self.day, self.hour,
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123 self.minute, self.second, 0, 0, 0))
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124 b = calendar.timegm((other.year, other.month, other.day, other.hour,
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125 other.minute, other.second, 0, 0, 0))
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126 diff = a - b
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127 if diff < 0:
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128 sign = -1
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129 diff = -diff
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130 else:
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131 sign = 1
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132 S = diff%60
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133 M = (diff/60)%60
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134 H = (diff/(60*60))%60
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135 if H>1: S = 0
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136 d = (diff/(24*60*60))%30
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137 if d>1: H = S = M = 0
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138 m = (diff/(30*24*60*60))%12
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139 if m>1: H = S = M = 0
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140 y = (diff/(365*24*60*60))
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141 if y>1: d = H = S = M = 0
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142 return Interval((y, m, d, H, M, S), sign=sign)
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143 t = (self.year - other.sign * other.year,
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144 self.month - other.sign * other.month,
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145 self.day - other.sign * other.day,
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146 self.hour - other.sign * other.hour,
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147 self.minute - other.sign * other.minute,
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148 self.second - other.sign * other.second, 0, 0, 0)
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149 return Date(time.gmtime(calendar.timegm(t)))
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150
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151 def __cmp__(self, other):
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152 """Compare this date to another date."""
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153 for attr in ('year', 'month', 'day', 'hour', 'minute', 'second'):
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154 r = cmp(getattr(self, attr), getattr(other, attr))
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155 if r: return r
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156 return 0
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157
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158 def __str__(self):
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159 """Return this date as a string in the yyyy-mm-dd.hh:mm:ss format."""
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160 return '%4d-%02d-%02d.%02d:%02d:%02d'%(self.year, self.month, self.day,
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161 self.hour, self.minute, self.second)
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162
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163 def pretty(self):
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164 ''' print up the date date using a pretty format...
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165 '''
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166 return time.strftime('%e %B %Y', (self.year, self.month,
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167 self.day, self.hour, self.minute, self.second, 0, 0, 0))
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168
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169 def set(self, spec, offset=0, date_re=re.compile(r'''
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170 (((?P<y>\d\d\d\d)-)?((?P<m>\d\d)-(?P<d>\d\d))?)? # yyyy-mm-dd
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171 (?P<n>\.)? # .
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172 (((?P<H>\d?\d):(?P<M>\d\d))?(:(?P<S>\d\d))?)? # hh:mm:ss
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173 (?P<o>.+)? # offset
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174 ''', re.VERBOSE)):
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175 ''' set the date to the value in spec
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176 '''
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177 m = date_re.match(spec)
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178 if not m:
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179 raise ValueError, 'Not a date spec: [[yyyy-]mm-dd].[[h]h:mm[:ss]] [offset]'
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180 info = m.groupdict()
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181
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182 # get the current date/time using the offset
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183 y,m,d,H,M,S,x,x,x = time.gmtime(time.time())
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184
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185 # override year, month, day parts
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186 if info['m'] is not None and info['d'] is not None:
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187 m = int(info['m'])
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188 d = int(info['d'])
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189 if info['y'] is not None: y = int(info['y'])
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190 H = M = S = 0
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191
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192 # override hour, minute, second parts
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193 if info['H'] is not None and info['M'] is not None:
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194 H = int(info['H']) - offset
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195 M = int(info['M'])
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196 S = 0
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197 if info['S'] is not None: S = int(info['S'])
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198
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199 # now handle the adjustment of hour
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200 ts = calendar.timegm((y,m,d,H,M,S,0,0,0))
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201 self.year, self.month, self.day, self.hour, self.minute, \
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202 self.second, x, x, x = time.gmtime(ts)
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203
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204 if info['o']:
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205 self.applyInterval(Interval(info['o']))
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206
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207 def __repr__(self):
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208 return '<Date %s>'%self.__str__()
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209
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210 def local(self, offset):
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211 """Return this date as yyyy-mm-dd.hh:mm:ss in a local time zone."""
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212 t = (self.year, self.month, self.day, self.hour + offset, self.minute,
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213 self.second, 0, 0, 0)
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214 self.year, self.month, self.day, self.hour, self.minute, \
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215 self.second, x, x, x = time.gmtime(calendar.timegm(t))
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216
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217 def get_tuple(self):
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218 return (self.year, self.month, self.day, self.hour, self.minute,
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219 self.second, 0, 0, 0)
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220
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221 class Interval:
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222 '''
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223 Date intervals are specified using the suffixes "y", "m", and "d". The
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224 suffix "w" (for "week") means 7 days. Time intervals are specified in
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225 hh:mm:ss format (the seconds may be omitted, but the hours and minutes
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226 may not).
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227
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228 "3y" means three years
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229 "2y 1m" means two years and one month
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230 "1m 25d" means one month and 25 days
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231 "2w 3d" means two weeks and three days
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232 "1d 2:50" means one day, two hours, and 50 minutes
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233 "14:00" means 14 hours
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234 "0:04:33" means four minutes and 33 seconds
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235
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236 Example usage:
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237 >>> Interval(" 3w 1 d 2:00")
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238 <Interval 22d 2:00>
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239 >>> Date(". + 2d") - Interval("3w")
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240 <Date 2000-06-07.00:34:02>
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241 '''
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242 isInterval = 1
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243
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244 def __init__(self, spec, sign=1):
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245 """Construct an interval given a specification."""
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246 if type(spec) == type(''):
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247 self.set(spec)
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248 else:
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249 self.sign = sign
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250 self.year, self.month, self.day, self.hour, self.minute, \
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251 self.second = spec
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252
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253 def __cmp__(self, other):
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254 """Compare this interval to another interval."""
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255 for attr in ('year', 'month', 'day', 'hour', 'minute', 'second'):
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256 r = cmp(getattr(self, attr), getattr(other, attr))
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257 if r: return r
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258 return 0
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259
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260 def __str__(self):
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261 """Return this interval as a string."""
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262 sign = {1:'+', -1:'-'}[self.sign]
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263 l = [sign]
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264 if self.year: l.append('%sy'%self.year)
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265 if self.month: l.append('%sm'%self.month)
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266 if self.day: l.append('%sd'%self.day)
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267 if self.second:
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268 l.append('%d:%02d:%02d'%(self.hour, self.minute, self.second))
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269 elif self.hour or self.minute:
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270 l.append('%d:%02d'%(self.hour, self.minute))
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271 return ' '.join(l)
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272
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273 def set(self, spec, interval_re = re.compile('''
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274 \s*
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275 (?P<s>[-+])? # + or -
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276 \s*
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277 ((?P<y>\d+\s*)y)? # year
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278 \s*
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279 ((?P<m>\d+\s*)m)? # month
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280 \s*
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281 ((?P<w>\d+\s*)w)? # week
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282 \s*
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283 ((?P<d>\d+\s*)d)? # day
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284 \s*
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285 (((?P<H>\d?\d):(?P<M>\d\d))?(:(?P<S>\d\d))?)? # time
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286 \s*
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287 ''', re.VERBOSE)):
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288 ''' set the date to the value in spec
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289 '''
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290 self.year = self.month = self.week = self.day = self.hour = \
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291 self.minute = self.second = 0
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292 self.sign = 1
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293 m = interval_re.match(spec)
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294 if not m:
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295 raise ValueError, 'Not an interval spec: [+-] [#y] [#m] [#w] [#d] [[[H]H:MM]:SS]'
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296
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297 info = m.groupdict()
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298 for group, attr in {'y':'year', 'm':'month', 'w':'week', 'd':'day',
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299 'H':'hour', 'M':'minute', 'S':'second'}.items():
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300 if info[group] is not None:
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301 setattr(self, attr, int(info[group]))
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302
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303 if self.week:
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304 self.day = self.day + self.week*7
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305
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306 if info['s'] is not None:
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307 self.sign = {'+':1, '-':-1}[info['s']]
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308
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309 def __repr__(self):
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310 return '<Interval %s>'%self.__str__()
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311
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312 def pretty(self, threshold=('d', 5)):
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313 ''' print up the date date using one of these nice formats..
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314 < 1 minute
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315 < 15 minutes
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316 < 30 minutes
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317 < 1 hour
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318 < 12 hours
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319 < 1 day
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320 otherwise, return None (so a full date may be displayed)
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321 '''
179
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322 if self.year or self.month > 2:
25
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323 return None
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324 if self.month:
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325 days = (self.month * 30) + self.day
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326 if days > 28:
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327 return '%s months'%int(days/30)
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328 else:
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329 return '%s weeks'%int(days/7)
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330 if self.day > 7:
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331 return '%s weeks'%self.day
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332 if self.day > 1:
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333 return '%s days'%self.day
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334 if self.day == 1 or self.hour > 12:
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335 return 'yesterday'
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336 if self.hour > 1:
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337 return '%s hours'%self.hour
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338 if self.hour == 1:
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339 if self.minute < 15:
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340 return 'an hour'
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341 quart = self.minute/15
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342 if quart == 2:
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343 return '1 1/2 hours'
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344 return '1 %s/4 hours'%quart
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345 if self.minute < 1:
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346 return 'just now'
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347 if self.minute == 1:
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348 return '1 minute'
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349 if self.minute < 15:
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350 return '%s minutes'%self.minute
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351 quart = int(self.minute/15)
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352 if quart == 2:
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353 return '1/2 an hour'
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354 return '%s/4 hour'%quart
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355
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356 def get_tuple(self):
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357 return (self.year, self.month, self.day, self.hour, self.minute,
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358 self.second)
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359
25
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360
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361 def test():
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362 intervals = (" 3w 1 d 2:00", " + 2d", "3w")
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363 for interval in intervals:
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364 print '>>> Interval("%s")'%interval
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365 print `Interval(interval)`
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366
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367 dates = (".", "2000-06-25.19:34:02", ". + 2d", "1997-04-17", "01-25",
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368 "08-13.22:13", "14:25")
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369 for date in dates:
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370 print '>>> Date("%s")'%date
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371 print `Date(date)`
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372
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373 sums = ((". + 2d", "3w"), (".", " 3w 1 d 2:00"))
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374 for date, interval in sums:
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375 print '>>> Date("%s") + Interval("%s")'%(date, interval)
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376 print `Date(date) + Interval(interval)`
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377
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378 if __name__ == '__main__':
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379 test()
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380
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381 #
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382 # $Log: not supported by cvs2svn $
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383 # Revision 1.9 2001/08/07 00:15:51 richard
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384 # Added the copyright/license notice to (nearly) all files at request of
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385 # Bizar Software.
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386 #
213
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387 # Revision 1.8 2001/08/05 07:46:12 richard
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388 # Changed date.Date to use regular string formatting instead of strftime -
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389 # win32 seems to have problems with %T and no hour... or something...
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390 #
206
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391 # Revision 1.7 2001/08/02 00:27:04 richard
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392 # Extended the range of intervals that are pretty-printed before actual dates
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393 # are displayed.
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394 #
179
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395 # Revision 1.6 2001/07/31 09:54:18 richard
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396 # Fixed the 2.1-specific gmtime() (no arg) call in roundup.date. (Paul Wright)
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397 #
168
92ac7b6c0301 Fixed the 2.1-specific gmtime() (no arg) call in roundup.date. (Paul Wright)
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398 # Revision 1.5 2001/07/29 07:01:39 richard
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399 # Added vim command to all source so that we don't get no steenkin' tabs :)
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400 #
127
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401 # Revision 1.4 2001/07/25 04:09:34 richard
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402 # Fixed offset handling (shoulda read the spec a little better)
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403 #
75
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diff changeset
404 # Revision 1.3 2001/07/23 07:56:05 richard
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parents: 47
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405 # Storing only marshallable data in the db - no nasty pickled class references.
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parents: 47
diff changeset
406 #
47
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diff changeset
407 # Revision 1.2 2001/07/22 12:09:32 richard
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diff changeset
408 # Final commit of Grande Splite
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diff changeset
409 #
26
c7c14960f413 Final commit of Grande Splite
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diff changeset
410 # Revision 1.1 2001/07/22 11:58:35 richard
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diff changeset
411 # More Grande Splite
25
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412 #
127
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413 #
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414 # vim: set filetype=python ts=4 sw=4 et si
Roundup Issue Tracker: http://roundup-tracker.org/