215 lines
9.0 KiB
Python
215 lines
9.0 KiB
Python
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##############################################################################
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# Copyright 2009, Gerhard Weis
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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 documentation
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# and/or other materials provided with the distribution.
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# * Neither the name of the authors nor the names of its contributors
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# may be used to endorse or promote products derived from this software
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# without specific prior written permission.
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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
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##############################################################################
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"""
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This module provides an alternative strftime method.
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The strftime method in this module allows only a subset of Python's strftime
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format codes, plus a few additional. It supports the full range of date values
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possible with standard Python date/time objects. Furthermore there are several
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pr-defined format strings in this module to make ease producing of ISO 8601
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conforming strings.
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"""
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import re
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from datetime import date, timedelta
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from isodate.duration import Duration
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from isodate.isotzinfo import tz_isoformat
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# Date specific format strings
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DATE_BAS_COMPLETE = '%Y%m%d'
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DATE_EXT_COMPLETE = '%Y-%m-%d'
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DATE_BAS_WEEK_COMPLETE = '%YW%W%w'
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DATE_EXT_WEEK_COMPLETE = '%Y-W%W-%w'
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DATE_BAS_ORD_COMPLETE = '%Y%j'
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DATE_EXT_ORD_COMPLETE = '%Y-%j'
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DATE_BAS_WEEK = '%YW%W'
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DATE_EXT_WEEK = '%Y-W%W'
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DATE_BAS_MONTH = '%Y%m'
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DATE_EXT_MONTH = '%Y-%m'
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DATE_YEAR = '%Y'
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DATE_CENTURY = '%C'
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# Time specific format strings
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TIME_BAS_COMPLETE = '%H%M%S'
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TIME_EXT_COMPLETE = '%H:%M:%S'
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TIME_BAS_MINUTE = '%H%M'
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TIME_EXT_MINUTE = '%H:%M'
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TIME_HOUR = '%H'
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# Time zone formats
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TZ_BAS = '%z'
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TZ_EXT = '%Z'
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TZ_HOUR = '%h'
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# DateTime formats
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DT_EXT_COMPLETE = DATE_EXT_COMPLETE + 'T' + TIME_EXT_COMPLETE + TZ_EXT
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DT_BAS_COMPLETE = DATE_BAS_COMPLETE + 'T' + TIME_BAS_COMPLETE + TZ_BAS
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DT_EXT_ORD_COMPLETE = DATE_EXT_ORD_COMPLETE + 'T' + TIME_EXT_COMPLETE + TZ_EXT
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DT_BAS_ORD_COMPLETE = DATE_BAS_ORD_COMPLETE + 'T' + TIME_BAS_COMPLETE + TZ_BAS
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DT_EXT_WEEK_COMPLETE = (DATE_EXT_WEEK_COMPLETE + 'T' +
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TIME_EXT_COMPLETE + TZ_EXT)
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DT_BAS_WEEK_COMPLETE = (DATE_BAS_WEEK_COMPLETE + 'T' +
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TIME_BAS_COMPLETE + TZ_BAS)
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# Duration formts
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D_DEFAULT = 'P%P'
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D_WEEK = 'P%p'
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D_ALT_EXT = 'P' + DATE_EXT_COMPLETE + 'T' + TIME_EXT_COMPLETE
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D_ALT_BAS = 'P' + DATE_BAS_COMPLETE + 'T' + TIME_BAS_COMPLETE
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D_ALT_EXT_ORD = 'P' + DATE_EXT_ORD_COMPLETE + 'T' + TIME_EXT_COMPLETE
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D_ALT_BAS_ORD = 'P' + DATE_BAS_ORD_COMPLETE + 'T' + TIME_BAS_COMPLETE
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STRF_DT_MAP = {'%d': lambda tdt, yds: '%02d' % tdt.day,
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'%f': lambda tdt, yds: '%06d' % tdt.microsecond,
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'%H': lambda tdt, yds: '%02d' % tdt.hour,
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'%j': lambda tdt, yds: '%03d' % (tdt.toordinal() -
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date(tdt.year,
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1, 1).toordinal() +
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1),
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'%m': lambda tdt, yds: '%02d' % tdt.month,
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'%M': lambda tdt, yds: '%02d' % tdt.minute,
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'%S': lambda tdt, yds: '%02d' % tdt.second,
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'%w': lambda tdt, yds: '%1d' % tdt.isoweekday(),
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'%W': lambda tdt, yds: '%02d' % tdt.isocalendar()[1],
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'%Y': lambda tdt, yds: (((yds != 4) and '+') or '') +
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(('%%0%dd' % yds) % tdt.year),
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'%C': lambda tdt, yds: (((yds != 4) and '+') or '') +
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(('%%0%dd' % (yds - 2)) %
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(tdt.year / 100)),
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'%h': lambda tdt, yds: tz_isoformat(tdt, '%h'),
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'%Z': lambda tdt, yds: tz_isoformat(tdt, '%Z'),
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'%z': lambda tdt, yds: tz_isoformat(tdt, '%z'),
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'%%': lambda tdt, yds: '%'}
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STRF_D_MAP = {'%d': lambda tdt, yds: '%02d' % tdt.days,
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'%f': lambda tdt, yds: '%06d' % tdt.microseconds,
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'%H': lambda tdt, yds: '%02d' % (tdt.seconds / 60 / 60),
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'%m': lambda tdt, yds: '%02d' % tdt.months,
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'%M': lambda tdt, yds: '%02d' % ((tdt.seconds / 60) % 60),
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'%S': lambda tdt, yds: '%02d' % (tdt.seconds % 60),
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'%W': lambda tdt, yds: '%02d' % (abs(tdt.days / 7)),
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'%Y': lambda tdt, yds: (((yds != 4) and '+') or '') +
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(('%%0%dd' % yds) % tdt.years),
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'%C': lambda tdt, yds: (((yds != 4) and '+') or '') +
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(('%%0%dd' % (yds - 2)) %
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(tdt.years / 100)),
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'%%': lambda tdt, yds: '%'}
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def _strfduration(tdt, format, yeardigits=4):
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'''
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this is the work method for timedelta and Duration instances.
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see strftime for more details.
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'''
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def repl(match):
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'''
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lookup format command and return corresponding replacement.
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'''
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if match.group(0) in STRF_D_MAP:
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return STRF_D_MAP[match.group(0)](tdt, yeardigits)
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elif match.group(0) == '%P':
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ret = []
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if isinstance(tdt, Duration):
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if tdt.years:
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ret.append('%sY' % abs(tdt.years))
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if tdt.months:
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ret.append('%sM' % abs(tdt.months))
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usecs = abs((tdt.days * 24 * 60 * 60 + tdt.seconds) * 1000000 +
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tdt.microseconds)
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seconds, usecs = divmod(usecs, 1000000)
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minutes, seconds = divmod(seconds, 60)
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hours, minutes = divmod(minutes, 60)
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days, hours = divmod(hours, 24)
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if days:
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ret.append('%sD' % days)
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if hours or minutes or seconds or usecs:
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ret.append('T')
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if hours:
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ret.append('%sH' % hours)
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if minutes:
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ret.append('%sM' % minutes)
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if seconds or usecs:
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if usecs:
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ret.append(("%d.%06d" % (seconds, usecs)).rstrip('0'))
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else:
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ret.append("%d" % seconds)
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ret.append('S')
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# at least one component has to be there.
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return ret and ''.join(ret) or '0D'
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elif match.group(0) == '%p':
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return str(abs(tdt.days // 7)) + 'W'
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return match.group(0)
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return re.sub('%d|%f|%H|%m|%M|%S|%W|%Y|%C|%%|%P|%p', repl,
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format)
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def _strfdt(tdt, format, yeardigits=4):
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'''
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this is the work method for time and date instances.
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see strftime for more details.
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'''
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def repl(match):
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'''
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lookup format command and return corresponding replacement.
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'''
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if match.group(0) in STRF_DT_MAP:
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return STRF_DT_MAP[match.group(0)](tdt, yeardigits)
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return match.group(0)
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return re.sub('%d|%f|%H|%j|%m|%M|%S|%w|%W|%Y|%C|%z|%Z|%h|%%', repl,
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format)
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def strftime(tdt, format, yeardigits=4):
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'''Directive Meaning Notes
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%d Day of the month as a decimal number [01,31].
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%f Microsecond as a decimal number [0,999999], zero-padded
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on the left (1)
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%H Hour (24-hour clock) as a decimal number [00,23].
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%j Day of the year as a decimal number [001,366].
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%m Month as a decimal number [01,12].
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%M Minute as a decimal number [00,59].
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%S Second as a decimal number [00,61]. (3)
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%w Weekday as a decimal number [0(Monday),6].
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%W Week number of the year (Monday as the first day of the week)
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as a decimal number [00,53]. All days in a new year preceding the
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first Monday are considered to be in week 0. (4)
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%Y Year with century as a decimal number. [0000,9999]
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%C Century as a decimal number. [00,99]
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%z UTC offset in the form +HHMM or -HHMM (empty string if the
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object is naive). (5)
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%Z Time zone name (empty string if the object is naive).
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%P ISO8601 duration format.
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%p ISO8601 duration format in weeks.
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%% A literal '%' character.
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'''
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if isinstance(tdt, (timedelta, Duration)):
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return _strfduration(tdt, format, yeardigits)
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return _strfdt(tdt, format, yeardigits)
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