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120 lines
4.1 KiB
Python
120 lines
4.1 KiB
Python
from __future__ import absolute_import, unicode_literals
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import re
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import time
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# ISO-8601 date parsing routines written by Fazal Majid.
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# The ISO 8601 standard is very convoluted and irregular - a full ISO 8601
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# parser is beyond the scope of feedparser and would be a worthwhile addition
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# to the Python library.
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# A single regular expression cannot parse ISO 8601 date formats into groups
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# as the standard is highly irregular (for instance is 030104 2003-01-04 or
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# 0301-04-01), so we use templates instead.
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# Please note the order in templates is significant because we need a
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# greedy match.
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_iso8601_tmpl = ['YYYY-?MM-?DD', 'YYYY-0MM?-?DD', 'YYYY-MM', 'YYYY-?OOO',
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'YY-?MM-?DD', 'YY-?OOO', 'YYYY',
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'-YY-?MM', '-OOO', '-YY',
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'--MM-?DD', '--MM',
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'---DD',
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'CC', '']
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_iso8601_re = [
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tmpl.replace(
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'YYYY', r'(?P<year>\d{4})').replace(
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'YY', r'(?P<year>\d\d)').replace(
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'MM', r'(?P<month>[01]\d)').replace(
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'DD', r'(?P<day>[0123]\d)').replace(
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'OOO', r'(?P<ordinal>[0123]\d\d)').replace(
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'CC', r'(?P<century>\d\d$)')
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+ r'(T?(?P<hour>\d{2}):(?P<minute>\d{2})'
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+ r'(:(?P<second>\d{2}))?'
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+ r'(\.(?P<fracsecond>\d+))?'
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+ r'(?P<tz>[+-](?P<tzhour>\d{2})(:(?P<tzmin>\d{2}))?|Z)?)?'
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for tmpl in _iso8601_tmpl]
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try:
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del tmpl
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except NameError:
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pass
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_iso8601_matches = [re.compile(regex).match for regex in _iso8601_re]
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try:
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del regex
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except NameError:
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pass
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def _parse_date_iso8601(dateString):
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'''Parse a variety of ISO-8601-compatible formats like 20040105'''
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m = None
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for _iso8601_match in _iso8601_matches:
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m = _iso8601_match(dateString)
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if m:
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break
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if not m:
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return
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if m.span() == (0, 0):
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return
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params = m.groupdict()
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ordinal = params.get('ordinal', 0)
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if ordinal:
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ordinal = int(ordinal)
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else:
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ordinal = 0
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year = params.get('year', '--')
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if not year or year == '--':
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year = time.gmtime()[0]
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elif len(year) == 2:
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# ISO 8601 assumes current century, i.e. 93 -> 2093, NOT 1993
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year = 100 * int(time.gmtime()[0] / 100) + int(year)
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else:
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year = int(year)
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month = params.get('month', '-')
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if not month or month == '-':
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# ordinals are NOT normalized by mktime, we simulate them
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# by setting month=1, day=ordinal
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if ordinal:
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month = 1
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else:
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month = time.gmtime()[1]
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month = int(month)
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day = params.get('day', 0)
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if not day:
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# see above
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if ordinal:
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day = ordinal
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elif params.get('century', 0) or \
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params.get('year', 0) or params.get('month', 0):
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day = 1
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else:
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day = time.gmtime()[2]
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else:
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day = int(day)
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# special case of the century - is the first year of the 21st century
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# 2000 or 2001 ? The debate goes on...
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if 'century' in params:
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year = (int(params['century']) - 1) * 100 + 1
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# in ISO 8601 most fields are optional
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for field in ['hour', 'minute', 'second', 'tzhour', 'tzmin']:
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if not params.get(field, None):
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params[field] = 0
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hour = int(params.get('hour', 0))
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minute = int(params.get('minute', 0))
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second = int(float(params.get('second', 0)))
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# weekday is normalized by mktime(), we can ignore it
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weekday = 0
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daylight_savings_flag = -1
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tm = [year, month, day, hour, minute, second, weekday,
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ordinal, daylight_savings_flag]
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# ISO 8601 time zone adjustments
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tz = params.get('tz')
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if tz and tz != 'Z':
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if tz[0] == '-':
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tm[3] += int(params.get('tzhour', 0))
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tm[4] += int(params.get('tzmin', 0))
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elif tz[0] == '+':
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tm[3] -= int(params.get('tzhour', 0))
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tm[4] -= int(params.get('tzmin', 0))
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else:
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return None
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# Python's time.mktime() is a wrapper around the ANSI C mktime(3c)
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# which is guaranteed to normalize d/m/y/h/m/s.
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# Many implementations have bugs, but we'll pretend they don't.
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return time.localtime(time.mktime(tuple(tm)))
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