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128 lines
4.5 KiB
Python
128 lines
4.5 KiB
Python
# Copyright 2010-2023 Kurt McKee <contactme@kurtmckee.org>
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# Copyright 2002-2008 Mark Pilgrim
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# All rights reserved.
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#
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# This file is a part of feedparser.
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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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#
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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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import datetime
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timezonenames = {
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"ut": 0,
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"gmt": 0,
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"z": 0,
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"adt": -3,
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"ast": -4,
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"at": -4,
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"edt": -4,
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"est": -5,
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"et": -5,
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"cdt": -5,
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"cst": -6,
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"ct": -6,
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"mdt": -6,
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"mst": -7,
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"mt": -7,
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"pdt": -7,
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"pst": -8,
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"pt": -8,
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"a": -1,
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"n": 1,
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"m": -12,
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"y": 12,
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}
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# W3 date and time format parser
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# http://www.w3.org/TR/NOTE-datetime
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# Also supports MSSQL-style datetimes as defined at:
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# http://msdn.microsoft.com/en-us/library/ms186724.aspx
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# (basically, allow a space as a date/time/timezone separator)
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def _parse_date_w3dtf(datestr):
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if not datestr.strip():
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return None
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parts = datestr.lower().split("t")
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if len(parts) == 1:
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# This may be a date only, or may be an MSSQL-style date
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parts = parts[0].split()
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if len(parts) == 1:
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# Treat this as a date only
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parts.append("00:00:00z")
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elif len(parts) > 2:
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return None
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date = parts[0].split("-", 2)
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if not date or len(date[0]) != 4:
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return None
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# Ensure that `date` has 3 elements. Using '1' sets the default
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# month to January and the default day to the 1st of the month.
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date.extend(["1"] * (3 - len(date)))
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try:
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year, month, day = (int(i) for i in date)
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except ValueError:
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# `date` may have more than 3 elements or may contain
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# non-integer strings.
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return None
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if parts[1].endswith("z"):
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parts[1] = parts[1][:-1]
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parts.append("z")
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# Append the numeric timezone offset, if any, to parts.
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# If this is an MSSQL-style date then parts[2] already contains
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# the timezone information, so `append()` will not affect it.
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# Add 1 to each value so that if `find()` returns -1 it will be
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# treated as False.
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loc = parts[1].find("-") + 1 or parts[1].find("+") + 1 or len(parts[1]) + 1
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loc = loc - 1
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parts.append(parts[1][loc:])
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parts[1] = parts[1][:loc]
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time = parts[1].split(":", 2)
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# Ensure that time has 3 elements. Using '0' means that the
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# minutes and seconds, if missing, will default to 0.
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time.extend(["0"] * (3 - len(time)))
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if parts[2][:1] in ("-", "+"):
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try:
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tzhour = int(parts[2][1:3])
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tzmin = int(parts[2][4:])
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except ValueError:
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return None
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if parts[2].startswith("-"):
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tzhour = tzhour * -1
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tzmin = tzmin * -1
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else:
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tzhour = timezonenames.get(parts[2], 0)
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tzmin = 0
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try:
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hour, minute, second = (int(float(i)) for i in time)
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except ValueError:
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return None
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# Create the datetime object and timezone delta objects
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try:
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stamp = datetime.datetime(year, month, day, hour, minute, second)
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except ValueError:
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return None
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delta = datetime.timedelta(0, 0, 0, 0, tzmin, tzhour)
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# Return the date and timestamp in a UTC 9-tuple
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try:
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return (stamp - delta).utctimetuple()
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except (OverflowError, ValueError):
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# IronPython throws ValueErrors instead of OverflowErrors
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return None
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