Limnoria/others/timeparse.py

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2004-09-17 06:56:38 +02:00
#!/usr/bin/python
#
# Copyright (c) 2004, Mike Taylor
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions, and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions, and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the author of this software nor the name of
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
__author__ = "Mike Taylor <bear@code-bear.com>"
__copyright__ = "Copyright (c) 2004 Mike Taylor"
__license__ = "BSD"
__revision__ = "$Id$"
import os, string, re, time
RE_SPECIAL = r'(?P<special>^[in|last|next]+)\s+'
RE_UNITS = r'\s+(?P<units>[hour|minute|second|day|week|month|year]+)'
RE_QUNITS = r'(?P<qunits>[0-9]+[hmsdwmy])'
RE_MODIFIER = r'(?P<modifier>[from|before|after|ago|prior]+)\s+'
CRE_SPECIAL = re.compile(RE_SPECIAL, re.IGNORECASE)
CRE_UNITS = re.compile(RE_UNITS, re.IGNORECASE)
CRE_QUNITS = re.compile(RE_QUNITS, re.IGNORECASE)
CRE_MODIFIER = re.compile(RE_MODIFIER, re.IGNORECASE)
# Used to adjust the returned date before/after the source
_Modifiers = {'from': 1,
'before': -1,
'after': 1,
'ago': 1,
'prior': -1}
_Minute = 60
_Hour = 60 * _Minute
_Day = 24 * _Hour
_Week = 7 * _Day
_Month = 30 * _Day
_Year = 365 * _Day
# This looks hokey - but it is a nice simple way to get
# the proper unit value and it has the advantage that
# later I can morph it into something localized.
# Any trailing s will be removed before lookup.
_Units = {'second': 1,
'sec': 1,
's': 1,
'minute': _Minute,
'min': _Minute,
'm': _Minute,
'hour': _Hour,
'hr': _Hour,
'h': _Hour,
'day': _Day,
'dy': _Day,
'd': _Day,
'week': _Week,
'wk': _Week,
'w': _Week,
'month': _Month,
'mth': _Month,
'm': _Month,
'year': _Year,
'yr': _Year,
'y': _Year}
def _buildTime(sourceTime, quantity, modifier, units):
"""Take quantity, modifier and units strings and convert them
into values, calcuate the time and return the adjusted
sourceTime
"""
# print '[%s][%s][%s]' % (quantity, modifier, units)
q = int(quantity)
if _Modifiers.has_key(modifier):
q = q * _Modifiers[modifier]
if units[-1] == 's':
units = units[:-1]
if _Units.has_key(units):
u = _Units[units]
else:
u = 1
# print 'sourceTime [%d]' % sourceTime
# print 'quantity [%d]' % q
# print 'units [%d]' % u
return sourceTime + (q * u)
def parse(timeString, sourceTime=None):
"""Parse timeString and return the number of seconds from sourceTime
that the timeString expression represents.
This version of parse understands only the more basic of expressions
in this form:
<quantity> <units> <modifier> <target>
Example:
5 minutes from now
last week
2 hours before noon
Valid units - hour, minute, second, month, week, day and year
(including their plural forms)
Valid modifiers - from, before, after, ago, prior
"""
if sourceTime == None:
sourceTime = int(time.time())
else:
sourceTime = int(sourceTime)
quantity = ''
units = ''
modifier = ''
target = ''
s = string.strip(string.lower(timeString))
m = CRE_SPECIAL.search(s)
if m <> None:
target = 'now'
if m.group('special') == 'last':
modifier = 'before'
else:
modifier = 'from'
s = s[m.end('special'):]
m = CRE_UNITS.search(s)
if m <> None:
units = m.group('units')
quantity = s[:m.start('units')]
s = s[m.end('units'):]
else:
m = CRE_MODIFIER.search(s)
if m <> None:
modifier = m.group('modifier')
target = s[m.end('modifier'):]
s = s[:m.start('modifier'):]
m = CRE_UNITS.search(s)
if m <> None:
units = m.group('units')
quantity = s[:m.start('units')]
target = s[m.end('units'):]
return _buildTime(sourceTime, quantity, modifier, units)
def _test(text, value):
print text
v = parse(text)
print '\t%s\t%d\t%d' % ((v == value), value, v)
#
# TODO
#
# - make month unit adjustment aware of the actual number of days in each
# month between source and target
# - handle edge case where quantity and unit are merged: 5s for 5 sec
# - handle compound/nested quantites and modifiers
# - bring unit test over from prototype into this file
# - convert 'five' to 5 and also 'twenty five' to 25
if __name__ == '__main__':
start = int(time.time())
tests = { '5 minutes from now': start + 5 * _Minute,
'5 min from now': start + 5 * _Minute,
'in 5 minutes': start + 5 * _Minute,
'5 days from today': start + 5 * _Day,
'5 days before today': start - 5 * _Day,
'5 minutes': start + 5 * _Minute,
'5 min': start + 5 * _Minute,
'30 seconds from now': start + 30,
'30 sec from now': start + 30,
'30 seconds': start + 30,
'30 sec': start + 30,
'1 week': start + _Week,
'1 wk': start + _Week,
'1 week': start + _Week,
'5 days': start + 5 * _Day,
'1 year': start + _Year,
'2 years': start + 2 * _Year}
for test in tests.keys():
_test(test, tests[test])