/usr/lib/python2.7/dist-packages/aniso8601/duration.py is in python-aniso8601 2.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (c) 2016, Brandon Nielsen
# All rights reserved.
#
# This software may be modified and distributed under the terms
# of the BSD license. See the LICENSE file for details.
import datetime
from aniso8601.date import parse_date
from aniso8601.time import parse_time
from aniso8601 import compat
def parse_duration(isodurationstr, relative=False):
#Given a string representing an ISO 8601 duration, return a
#datetime.timedelta (or dateutil.relativedelta.relativedelta
#if relative=True) that matches the given duration. Valid formats are:
#
#PnYnMnDTnHnMnS (or any reduced precision equivalent)
#P<date>T<time>
if isodurationstr[0] != 'P':
raise ValueError('ISO 8601 duration must start with a P.')
#If Y, M, D, H, S, or W are in the string, assume it is a specified duration
if _has_any_component(isodurationstr, ['Y', 'M', 'D', 'H', 'S', 'W']) is True:
return _parse_duration_prescribed(isodurationstr, relative)
else:
return _parse_duration_combined(isodurationstr, relative)
def _parse_duration_prescribed(durationstr, relative):
#durationstr can be of the form PnYnMnDTnHnMnS or PnW
#Make sure the end character is valid
#https://bitbucket.org/nielsenb/aniso8601/issues/9/durations-with-trailing-garbage-are-parsed
if durationstr[-1] not in ['Y', 'M', 'D', 'H', 'S', 'W']:
raise ValueError('ISO 8601 duration must end with a valid character.')
#Make sure only the lowest order element has decimal precision
if durationstr.count('.') > 1:
raise ValueError('ISO 8601 allows only lowest order element to have a decimal fraction.')
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() is True:
lettercount += 1
if lettercount > 1:
raise ValueError('ISO 8601 duration must end with a single valid character.')
#Do not allow W in combination with other designators
#https://bitbucket.org/nielsenb/aniso8601/issues/2/week-designators-should-not-be-combinable
if durationstr.find('W') != -1 and _has_any_component(durationstr, ['Y', 'M', 'D', 'H', 'S']) is True:
raise ValueError('ISO 8601 week designators may not be combined with other time designators.')
#Parse the elements of the duration
if durationstr.find('T') == -1:
years, months, weeks, days, hours, minutes, seconds = _parse_duration_prescribed_notime(durationstr)
else:
years, months, weeks, days, hours, minutes, seconds = _parse_duration_prescribed_time(durationstr)
if relative is True:
try:
import dateutil.relativedelta
if int(years) != years or int(months) != months:
#https://github.com/dateutil/dateutil/issues/40
raise ValueError('Fractional months and years are not defined for relative intervals.')
return dateutil.relativedelta.relativedelta(years=int(years), months=int(months), weeks=weeks, days=days, hours=hours, minutes=minutes, seconds=seconds)
except ImportError:
raise RuntimeError('dateutil must be installed for relative duration support.')
#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_prescribed_notime(durationstr):
#durationstr can be of the form PnYnMnD or PnW
#Make sure no time portion is included
#https://bitbucket.org/nielsenb/aniso8601/issues/7/durations-with-time-components-before-t
if _has_any_component(durationstr, ['H', 'S']):
raise ValueError('ISO 8601 time components not allowed in duration without prescribed time.')
if _component_order_correct(durationstr, ['P', 'Y', 'M', 'D', 'W']) is False:
raise ValueError('ISO 8601 duration components must be in the correct order.')
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
return (years, months, weeks, days, hours, minutes, seconds)
def _parse_duration_prescribed_time(durationstr):
#durationstr can be of the form PnYnMnDTnHnMnS
firsthalf = durationstr[:durationstr.find('T')]
secondhalf = durationstr[durationstr.find('T'):]
#Make sure no time portion is included in the date half
#https://bitbucket.org/nielsenb/aniso8601/issues/7/durations-with-time-components-before-t
if _has_any_component(firsthalf, ['H', 'S']):
raise ValueError('ISO 8601 time components not allowed in date portion of duration.')
if _component_order_correct(firsthalf, ['P', 'Y', 'M', 'D', 'W']) is False:
raise ValueError('ISO 8601 duration components must be in the correct order.')
#Make sure no date component is included in the time half
if _has_any_component(secondhalf, ['Y', 'D']):
raise ValueError('ISO 8601 time components not allowed in date portion of duration.')
if _component_order_correct(secondhalf, ['T', 'H', 'M', 'S']) is False:
raise ValueError('ISO 8601 time components in duration must be in the correct order.')
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 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
#Weeks can't be included
weeks = 0
return (years, months, weeks, days, hours, minutes, seconds)
def _parse_duration_combined(durationstr, relative):
#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)
if relative is True:
try:
import dateutil.relativedelta
return dateutil.relativedelta.relativedelta(years=datevalue.year, months=datevalue.month, days=datevalue.day, hours=timevalue.hour, minutes=timevalue.minute, seconds=timevalue.second, microseconds=timevalue.microsecond)
except ImportError:
raise RuntimeError('dateutil must be installed for relative duration support.')
else:
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 compat.range(durationendindex - 1, 0, -1):
if durationstr[characterindex].isalpha() is True:
durationstartindex = characterindex
break
durationstartindex += 1
if ',' in durationstr:
#Replace the comma with a 'full-stop'
durationstr = durationstr.replace(',', '.')
return float(durationstr[durationstartindex:durationendindex])
def _has_any_component(durationstr, components):
#Given a duration string, and a list of components, returns True
#if any of the listed components are present, False otherwise.
#
#For instance:
#durationstr = 'P1Y'
#components = ['Y', 'M']
#
#returns True
#
#durationstr = 'P1Y'
#components = ['M', 'D']
#
#returns False
for component in components:
if durationstr.find(component) != -1:
return True
return False
def _component_order_correct(durationstr, componentorder):
#Given a duration string, and a list of components, returns
#True if the components are in the same order as the
#component order list, False otherwise. Characters that
#are present in the component order list but not in the
#duration string are ignored.
#
#https://bitbucket.org/nielsenb/aniso8601/issues/8/durations-with-components-in-wrong-order
#
#durationstr = 'P1Y1M1D'
#components = ['P', 'Y', 'M', 'D']
#
#returns True
#
#durationstr = 'P1Y1M'
#components = ['P', 'Y', 'M', 'D']
#
#returns True
#
#durationstr = 'P1D1Y1M'
#components = ['P', 'Y', 'M', 'D']
#
#returns False
componentindex = 0
for characterindex in compat.range(len(durationstr)):
character = durationstr[characterindex]
if character in componentorder:
#This is a character we need to check the order of
if character in componentorder[componentindex:]:
componentindex = componentorder.index(character)
else:
#A character is out of order
return False
return True
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