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