/usr/lib/python3/dist-packages/aniso8601/duration.py is in python3-aniso8601 0.83-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 | # -*- coding: utf-8 -*-
#Copyright 2013 Brandon Nielsen
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import datetime
from .date import parse_date
from .time import parse_time
def parse_duration(isodurationstr):
#Given a string representing an ISO 8601 duration, return a
#datetime.timedelta that matches the given duration. Valid formts are:
#
#PnYnMnDTnHnMnS (or any reduced precision equivalent)
#P<date>T<time>
if isodurationstr[0] != 'P':
raise ValueError('String is not a valid ISO8601 duration.')
#If Y, M, D, H, or S are in the string, assume it is a specified duration
if isodurationstr.find('Y') != -1 or isodurationstr.find('M') != -1 or isodurationstr.find('W') != -1 or isodurationstr.find('D') != -1 or isodurationstr.find('H') != -1 or isodurationstr.find('S') != -1:
return parse_duration_prescribed(isodurationstr)
else:
return parse_duration_combined(isodurationstr)
def parse_duration_prescribed(durationstr):
#durationstr can be of the form PnYnMnDTnHnMnS or PnW
#Make sure only the lowest order element has decimal precision
if durationstr.count('.') > 1:
raise ValueError('String is not a valid ISO8601 duration.')
elif durationstr.count('.') == 1:
#There should only ever be 1 letter after a decimal if there is more
#then one, the string is invalid
lettercount = 0;
for character in durationstr.split('.')[1]:
if character.isalpha() == True:
lettercount += 1
if lettercount > 1:
raise ValueError('String is not a valid ISO8601 duration.')
#Parse the elements of the duration
if durationstr.find('T') == -1:
if durationstr.find('Y') != -1:
years = _parse_duration_element(durationstr, 'Y')
else:
years = 0
if durationstr.find('M') != -1:
months = _parse_duration_element(durationstr, 'M')
else:
months = 0
if durationstr.find('W') != -1:
weeks = _parse_duration_element(durationstr, 'W')
else:
weeks = 0
if durationstr.find('D') != -1:
days = _parse_duration_element(durationstr, 'D')
else:
days = 0
#No hours, minutes or seconds
hours = 0
minutes = 0
seconds = 0
else:
firsthalf = durationstr[:durationstr.find('T')]
secondhalf = durationstr[durationstr.find('T'):]
if firsthalf.find('Y') != -1:
years = _parse_duration_element(firsthalf, 'Y')
else:
years = 0
if firsthalf.find('M') != -1:
months = _parse_duration_element(firsthalf, 'M')
else:
months = 0
if durationstr.find('W') != -1:
weeks = _parse_duration_element(durationstr, 'W')
else:
weeks = 0
if firsthalf.find('D') != -1:
days = _parse_duration_element(firsthalf, 'D')
else:
days = 0
if secondhalf.find('H') != -1:
hours = _parse_duration_element(secondhalf, 'H')
else:
hours = 0
if secondhalf.find('M') != -1:
minutes = _parse_duration_element(secondhalf, 'M')
else:
minutes = 0
if secondhalf.find('S') != -1:
seconds = _parse_duration_element(secondhalf, 'S')
else:
seconds = 0
#Note that weeks can be handled without conversion to days
totaldays = years * 365 + months * 30 + days
return datetime.timedelta(weeks=weeks, days=totaldays, hours=hours, minutes=minutes, seconds=seconds)
def parse_duration_combined(durationstr):
#Period of the form P<date>T<time>
#Split the string in to its component parts
datepart, timepart = durationstr[1:].split('T') #We skip the 'P'
datevalue = parse_date(datepart)
timevalue = parse_time(timepart)
totaldays = datevalue.year * 365 + datevalue.month * 30 + datevalue.day
return datetime.timedelta(days=totaldays, hours=timevalue.hour, minutes=timevalue.minute, seconds=timevalue.second, microseconds=timevalue.microsecond)
def _parse_duration_element(durationstr, elementstr):
#Extracts the specified portion of a duration, for instance, given:
#durationstr = 'T4H5M6.1234S'
#elementstr = 'H'
#
#returns 4
#
#Note that the string must start with a character, so its assumed the
#full duration string would be split at the 'T'
durationstartindex = 0
durationendindex = durationstr.find(elementstr)
for characterindex in range(durationendindex - 1, 0, -1):
if durationstr[characterindex].isalpha() == True:
durationstartindex = characterindex
break
durationstartindex += 1
if ',' in durationstr:
#Replace the comma with a 'full-stop'
durationstr = durationstr.replace(',', '.')
return float(durationstr[durationstartindex:durationendindex])
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