mirror of
https://github.com/SickGear/SickGear.git
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1331 lines
50 KiB
Python
1331 lines
50 KiB
Python
# -*- coding:iso-8859-1 -*-
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"""
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This module offers a generic date/time string parser which is able to parse
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most known formats to represent a date and/or time.
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This module attempts to be forgiving with regards to unlikely input formats,
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returning a datetime object even for dates which are ambiguous. If an element of
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a date/time stamp is omitted, the following rules are applied:
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- If AM or PM is left unspecified, a 24-hour clock is assumed, however, an hour
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on a 12-hour clock (`0 <= hour <= 12`) *must* be specified if AM or PM is
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specified.
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- If a time zone is omitted, it is assumed to be UTC.
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If any other elements are missing, they are taken from the `datetime.datetime`
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object passed to the parameter `default`. If this results in a day number
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exceeding the valid number of days per month, one can fall back to the last
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day of the month by setting `fallback_on_invalid_day` parameter to `True`.
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Also provided is the `smart_defaults` option, which attempts to fill in the
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missing elements from context. If specified, the logic is:
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- If the omitted element is smaller than the largest specified element, select
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the *earliest* time matching the specified conditions; so `"June 2010"` is
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interpreted as `June 1, 2010 0:00:00`) and the (somewhat strange)
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`"Feb 1997 3:15 PM"` is interpreted as `February 1, 1997 15:15:00`.
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- If the element is larger than the largest specified element, select the
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*most recent* time matching the specified conditions (e.g parsing `"May"`
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in June 2015 returns the date May 1st, 2015, whereas parsing it in April 2015
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returns May 1st 2014). If using the `date_in_future` flag, this logic is
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inverted, and instead the *next* time matching the specified conditions is
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returned.
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Additional resources about date/time string formats can be found below:
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- `A summary of the international standard date and time notation
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<http://www.cl.cam.ac.uk/~mgk25/iso-time.html>`_
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- `W3C Date and Time Formats <http://www.w3.org/TR/NOTE-datetime>`_
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- `Time Formats (Planetary Rings Node) <http://pds-rings.seti.org/tools/time_formats.html>`_
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- `CPAN ParseDate module
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<http://search.cpan.org/~muir/Time-modules-2013.0912/lib/Time/ParseDate.pm>`_
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- `Java SimpleDateFormat Class
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<https://docs.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html>`_
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"""
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from __future__ import unicode_literals
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import datetime
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import string
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import time
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import collections
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from io import StringIO
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from calendar import monthrange, isleap
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from six import text_type, binary_type, integer_types
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from . import relativedelta
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from . import tz
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__all__ = ["parse", "parserinfo"]
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class _timelex(object):
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def __init__(self, instream):
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if isinstance(instream, binary_type):
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instream = instream.decode()
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if isinstance(instream, text_type):
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instream = StringIO(instream)
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self.instream = instream
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self.wordchars = ('abcdfeghijklmnopqrstuvwxyz'
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'ABCDEFGHIJKLMNOPQRSTUVWXYZ_'
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'<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>'
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'<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>')
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self.numchars = '0123456789'
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self.whitespace = ' \t\r\n'
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self.charstack = []
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self.tokenstack = []
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self.eof = False
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def get_token(self):
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"""
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This function breaks the time string into lexical units (tokens), which
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can be parsed by the parser. Lexical units are demarcated by changes in
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the character set, so any continuous string of letters is considered one
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unit, any continuous string of numbers is considered one unit.
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The main complication arises from the fact that dots ('.') can be used
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both as separators (e.g. "Sep.20.2009") or decimal points (e.g.
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"4:30:21.447"). As such, it is necessary to read the full context of
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any dot-separated strings before breaking it into tokens; as such, this
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function maintains a "token stack", for when the ambiguous context
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demands that multiple tokens be parsed at once.
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"""
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if self.tokenstack:
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return self.tokenstack.pop(0)
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seenletters = False
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token = None
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state = None
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wordchars = self.wordchars
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numchars = self.numchars
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whitespace = self.whitespace
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while not self.eof:
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# We only realize that we've reached the end of a token when we find
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# a character that's not part of the current token - since that
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# character may be part of the next token, it's stored in the
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# charstack.
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if self.charstack:
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nextchar = self.charstack.pop(0)
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else:
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nextchar = self.instream.read(1)
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while nextchar == '\x00':
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nextchar = self.instream.read(1)
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if not nextchar:
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self.eof = True
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break
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elif not state:
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# First character of the token - determines if we're starting
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# to parse a word, a number or something else.
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token = nextchar
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if nextchar in wordchars:
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state = 'a'
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elif nextchar in numchars:
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state = '0'
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elif nextchar in whitespace:
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token = ' '
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break # emit token
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else:
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break # emit token
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elif state == 'a':
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# If we've already started reading a word, we keep reading
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# letters until we find something that's not part of a word.
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seenletters = True
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if nextchar in wordchars:
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token += nextchar
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elif nextchar == '.':
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token += nextchar
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state = 'a.'
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else:
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self.charstack.append(nextchar)
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break # emit token
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elif state == '0':
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# If we've already started reading a number, we keep reading
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# numbers until we find something that doesn't fit.
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if nextchar in numchars:
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token += nextchar
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elif nextchar == '.':
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token += nextchar
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state = '0.'
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else:
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self.charstack.append(nextchar)
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break # emit token
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elif state == 'a.':
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# If we've seen some letters and a dot separator, continue
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# parsing, and the tokens will be broken up later.
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seenletters = True
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if nextchar == '.' or nextchar in wordchars:
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token += nextchar
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elif nextchar in numchars and token[-1] == '.':
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token += nextchar
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state = '0.'
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else:
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self.charstack.append(nextchar)
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break # emit token
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elif state == '0.':
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# If we've seen at least one dot separator, keep going, we'll
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# break up the tokens later.
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if nextchar == '.' or nextchar in numchars:
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token += nextchar
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elif nextchar in wordchars and token[-1] == '.':
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token += nextchar
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state = 'a.'
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else:
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self.charstack.append(nextchar)
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break # emit token
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if (state in ('a.', '0.') and (seenletters or token.count('.') > 1 or
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token[-1] == '.')):
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l = token.split('.')
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token = l[0]
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for tok in l[1:]:
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self.tokenstack.append('.')
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if tok:
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self.tokenstack.append(tok)
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return token
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def __iter__(self):
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return self
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def __next__(self):
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token = self.get_token()
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if token is None:
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raise StopIteration
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return token
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def next(self):
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return self.__next__() # Python 2.x support
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def split(cls, s):
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return list(cls(s))
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split = classmethod(split)
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class _resultbase(object):
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def __init__(self):
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for attr in self.__slots__:
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setattr(self, attr, None)
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def _repr(self, classname):
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l = []
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for attr in self.__slots__:
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value = getattr(self, attr)
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if value is not None:
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l.append("%s=%s" % (attr, repr(value)))
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return "%s(%s)" % (classname, ", ".join(l))
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def __repr__(self):
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return self._repr(self.__class__.__name__)
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class parserinfo(object):
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"""
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Class which handles what inputs are accepted. Subclass this to customize the
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language and acceptable values for each parameter.
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:param dayfirst:
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Whether to interpret the first value in an ambiguous 3-integer date
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(e.g. 01/05/09) as the day (`True`) or month (`False`). If
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`yearfirst` is set to `True`, this distinguishes between YDM and
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YMD. Default is `False`.
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:param yearfirst:
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Whether to interpret the first value in an ambiguous 3-integer date
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(e.g. 01/05/09) as the year. If `True`, the first number is taken to
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be the year, otherwise the last number is taken to be the year.
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Default is `False`.
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"""
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# m from a.m/p.m, t from ISO T separator
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JUMP = [" ", ".", ",", ";", "-", "/", "'",
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"at", "on", "and", "ad", "m", "t", "of",
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"st", "nd", "rd", "th"]
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WEEKDAYS = [("Mon", "Monday"),
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("Tue", "Tuesday"),
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("Wed", "Wednesday"),
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("Thu", "Thursday"),
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("Fri", "Friday"),
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("Sat", "Saturday"),
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("Sun", "Sunday")]
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MONTHS = [("Jan", "January"),
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("Feb", "February"),
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("Mar", "March"),
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("Apr", "April"),
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("May", "May"),
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("Jun", "June"),
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("Jul", "July"),
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("Aug", "August"),
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("Sep", "Sept", "September"),
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("Oct", "October"),
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("Nov", "November"),
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("Dec", "December")]
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HMS = [("h", "hour", "hours"),
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("m", "minute", "minutes"),
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("s", "second", "seconds")]
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AMPM = [("am", "a"),
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("pm", "p")]
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UTCZONE = ["UTC", "GMT", "Z"]
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PERTAIN = ["of"]
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TZOFFSET = {}
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def __init__(self, dayfirst=False, yearfirst=False, smart_defaults=False):
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self._jump = self._convert(self.JUMP)
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self._weekdays = self._convert(self.WEEKDAYS)
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self._months = self._convert(self.MONTHS)
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self._hms = self._convert(self.HMS)
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self._ampm = self._convert(self.AMPM)
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self._utczone = self._convert(self.UTCZONE)
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self._pertain = self._convert(self.PERTAIN)
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self.dayfirst = dayfirst
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self.yearfirst = yearfirst
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self.smart_defaults = smart_defaults
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self._year = time.localtime().tm_year
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self._century = self._year // 100*100
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def _convert(self, lst):
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dct = {}
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for i, v in enumerate(lst):
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if isinstance(v, tuple):
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for v in v:
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dct[v.lower()] = i
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else:
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dct[v.lower()] = i
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return dct
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def jump(self, name):
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return name.lower() in self._jump
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def weekday(self, name):
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if len(name) >= 3:
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try:
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return self._weekdays[name.lower()]
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except KeyError:
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pass
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return None
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def month(self, name):
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if len(name) >= 3:
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try:
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return self._months[name.lower()]+1
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except KeyError:
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pass
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return None
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def hms(self, name):
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try:
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return self._hms[name.lower()]
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except KeyError:
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return None
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def ampm(self, name):
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try:
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return self._ampm[name.lower()]
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except KeyError:
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return None
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def pertain(self, name):
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return name.lower() in self._pertain
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def utczone(self, name):
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return name.lower() in self._utczone
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def tzoffset(self, name):
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if name in self._utczone:
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return 0
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return self.TZOFFSET.get(name)
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def convertyear(self, year):
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if year < 100:
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year += self._century
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if abs(year-self._year) >= 50:
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if year < self._year:
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year += 100
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else:
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year -= 100
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return year
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def validate(self, res):
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# move to info
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if res.year is not None:
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res.year = self.convertyear(res.year)
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if res.tzoffset == 0 and not res.tzname or res.tzname == 'Z':
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res.tzname = "UTC"
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res.tzoffset = 0
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elif res.tzoffset != 0 and res.tzname and self.utczone(res.tzname):
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res.tzoffset = 0
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return True
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class parser(object):
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def __init__(self, info=None):
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self.info = info or parserinfo()
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def parse(self, timestr, default=None, ignoretz=False, tzinfos=None,
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smart_defaults=None, date_in_future=False,
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fallback_on_invalid_day=None, **kwargs):
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"""
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Parse the date/time string into a datetime object.
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:param timestr:
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Any date/time string using the supported formats.
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:param default:
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The default datetime object, if this is a datetime object and not
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`None`, elements specified in `timestr` replace elements in the
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default object, unless `smart_defaults` is set to `True`, in which
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case to the extent necessary, timestamps are calculated relative to
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this date.
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:param smart_defaults:
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If using smart defaults, the `default` parameter is treated as the
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effective parsing date/time, and the context of the datetime string
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is determined relative to `default`. If `None`, this parameter is
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inherited from the :class:`parserinfo` object.
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:param date_in_future:
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If `smart_defaults` is `True`, the parser assumes by default that
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the timestamp refers to a date in the past, and will return the
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beginning of the most recent timespan which matches the time string
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(e.g. if `default` is March 3rd, 2013, "Feb" parses to
|
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"Feb 1, 2013" and "May 3" parses to May 3rd, 2012). Setting this
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parameter to `True` inverts this assumption, and returns the
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beginning of the *next* matching timespan.
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:param fallback_on_invalid_day:
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If specified `True`, an otherwise invalid date such as "Feb 30" or
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"June 32" falls back to the last day of the month. If specified as
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"False", the parser is strict about parsing otherwise valid dates
|
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that would turn up as invalid because of the fallback rules (e.g.
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"Feb 2010" run with a default of January 30, 2010 and `smartparser`
|
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set to `False` would would throw an error, rather than falling
|
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back to the end of February). If `None` or unspecified, the date
|
||
falls back to the most recent valid date only if the invalid date
|
||
is created as a result of an unspecified day in the time string.
|
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|
||
:param ignoretz:
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Whether or not to ignore the time zone.
|
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|
||
:param tzinfos:
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A time zone, to be applied to the date, if `ignoretz` is `True`.
|
||
This can be either a subclass of `tzinfo`, a time zone string or an
|
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integer offset.
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|
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:param **kwargs:
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Keyword arguments as passed to `_parse()`.
|
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|
||
:return:
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Returns a `datetime.datetime` object or, if the `fuzzy_with_tokens`
|
||
option is `True`, returns a tuple, the first element being a
|
||
`datetime.datetime` object, the second a tuple containing the
|
||
fuzzy tokens.
|
||
|
||
:raises ValueError:
|
||
Raised for invalid or unknown string format, if the provided
|
||
`tzinfo` is not in a valid format, or if an invalid date would
|
||
be created.
|
||
|
||
:raises OverFlowError:
|
||
Raised if the parsed date exceeds the largest valid C integer on
|
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your system.
|
||
"""
|
||
|
||
if smart_defaults is None:
|
||
smart_defaults = self.info.smart_defaults
|
||
|
||
if default is None:
|
||
effective_dt = datetime.datetime.now()
|
||
default = datetime.datetime.now().replace(hour=0, minute=0,
|
||
second=0, microsecond=0)
|
||
else:
|
||
effective_dt = default
|
||
|
||
if kwargs.get('fuzzy_with_tokens', False):
|
||
res, skipped_tokens = self._parse(timestr, **kwargs)
|
||
else:
|
||
res = self._parse(timestr, **kwargs)
|
||
|
||
if res is None:
|
||
raise ValueError("Unknown string format")
|
||
|
||
repl = {}
|
||
for attr in ("year", "month", "day", "hour",
|
||
"minute", "second", "microsecond"):
|
||
value = getattr(res, attr)
|
||
if value is not None:
|
||
repl[attr] = value
|
||
|
||
# Choose the correct fallback position if requested by the
|
||
# `smart_defaults` parameter.
|
||
if smart_defaults:
|
||
# Determine if it refers to this year, last year or next year
|
||
if res.year is None:
|
||
if res.month is not None:
|
||
# Explicitly deal with leap year problems
|
||
if res.month == 2 and (res.day is not None and
|
||
res.day == 29):
|
||
|
||
ly_offset = 4 if date_in_future else -4
|
||
next_year = 4 * (default.year // 4)
|
||
|
||
if date_in_future:
|
||
next_year += ly_offset
|
||
|
||
if not isleap(next_year):
|
||
next_year += ly_offset
|
||
|
||
if not isleap(default.year):
|
||
default = default.replace(year=next_year)
|
||
elif date_in_future:
|
||
next_year = default.year + 1
|
||
else:
|
||
next_year = default.year - 1
|
||
|
||
if ((res.month == default.month and res.day is not None and
|
||
((res.day < default.day and date_in_future) or
|
||
(res.day > default.day and not date_in_future))) or
|
||
((res.month < default.month and date_in_future) or
|
||
(res.month > default.month and not date_in_future))):
|
||
|
||
default = default.replace(year=next_year)
|
||
|
||
# Select a proper month
|
||
if res.month is None:
|
||
if res.year is not None:
|
||
default = default.replace(month=1)
|
||
|
||
# I'm not sure if this is even possible.
|
||
if res.day is not None:
|
||
if res.day < default.day and date_in_future:
|
||
default += datetime.timedelta(months=1)
|
||
elif res.day > default.day and not date_in_future:
|
||
default -= datetime.timedelta(months=1)
|
||
|
||
if res.day is None:
|
||
# Determine if it's today, tomorrow or yesterday.
|
||
if res.year is None and res.month is None:
|
||
t_repl = {}
|
||
for key, val in repl.iteritems():
|
||
if key in ('hour', 'minute', 'second', 'microsecond'):
|
||
t_repl[key] = val
|
||
|
||
stime = effective_dt.replace(**t_repl)
|
||
|
||
if stime < effective_dt and date_in_future:
|
||
default += datetime.timedelta(days=1)
|
||
elif stime > effective_dt and not date_in_future:
|
||
default -= datetime.timedelta(days=1)
|
||
else:
|
||
# Otherwise it's the beginning of the month
|
||
default = default.replace(day=1)
|
||
|
||
if fallback_on_invalid_day or (fallback_on_invalid_day is None and
|
||
'day' not in repl):
|
||
# If the default day exceeds the last day of the month, fall back to
|
||
# the end of the month.
|
||
cyear = default.year if res.year is None else res.year
|
||
cmonth = default.month if res.month is None else res.month
|
||
cday = default.day if res.day is None else res.day
|
||
|
||
if cday > monthrange(cyear, cmonth)[1]:
|
||
repl['day'] = monthrange(cyear, cmonth)[1]
|
||
|
||
ret = default.replace(**repl)
|
||
|
||
if res.weekday is not None and not res.day:
|
||
ret = ret+relativedelta.relativedelta(weekday=res.weekday)
|
||
|
||
if not ignoretz:
|
||
if (isinstance(tzinfos, collections.Callable) or
|
||
tzinfos and res.tzname in tzinfos):
|
||
|
||
if isinstance(tzinfos, collections.Callable):
|
||
tzdata = tzinfos(res.tzname, res.tzoffset)
|
||
else:
|
||
tzdata = tzinfos.get(res.tzname)
|
||
|
||
if isinstance(tzdata, datetime.tzinfo):
|
||
tzinfo = tzdata
|
||
elif isinstance(tzdata, text_type):
|
||
tzinfo = tz.tzstr(tzdata)
|
||
elif isinstance(tzdata, integer_types):
|
||
tzinfo = tz.tzoffset(res.tzname, tzdata)
|
||
else:
|
||
raise ValueError("Offset must be tzinfo subclass, "
|
||
"tz string, or int offset.")
|
||
ret = ret.replace(tzinfo=tzinfo)
|
||
elif res.tzname and res.tzname in time.tzname:
|
||
ret = ret.replace(tzinfo=tz.tzlocal())
|
||
elif res.tzoffset == 0:
|
||
ret = ret.replace(tzinfo=tz.tzutc())
|
||
elif res.tzoffset:
|
||
ret = ret.replace(tzinfo=tz.tzoffset(res.tzname, res.tzoffset))
|
||
|
||
if kwargs.get('fuzzy_with_tokens', False):
|
||
return ret, skipped_tokens
|
||
else:
|
||
return ret
|
||
|
||
class _result(_resultbase):
|
||
__slots__ = ["year", "month", "day", "weekday",
|
||
"hour", "minute", "second", "microsecond",
|
||
"tzname", "tzoffset", "ampm"]
|
||
|
||
def _parse(self, timestr, dayfirst=None, yearfirst=None, fuzzy=False,
|
||
fuzzy_with_tokens=False):
|
||
"""
|
||
Private method which performs the heavy lifting of parsing, called from
|
||
`parse()`, which passes on its `kwargs` to this function.
|
||
|
||
:param timestr:
|
||
The string to parse.
|
||
|
||
:param dayfirst:
|
||
Whether to interpret the first value in an ambiguous 3-integer date
|
||
(e.g. 01/05/09) as the day (`True`) or month (`False`). If
|
||
`yearfirst` is set to `True`, this distinguishes between YDM and
|
||
YMD. If set to `None`, this value is retrieved from the current
|
||
`parserinfo` object (which itself defaults to `False`).
|
||
|
||
:param yearfirst:
|
||
Whether to interpret the first value in an ambiguous 3-integer date
|
||
(e.g. 01/05/09) as the year. If `True`, the first number is taken to
|
||
be the year, otherwise the last number is taken to be the year. If
|
||
this is set to `None`, the value is retrieved from the current
|
||
`parserinfo` object (which itself defaults to `False`).
|
||
|
||
:param fuzzy:
|
||
Whether to allow fuzzy parsing, allowing for string like "Today is
|
||
January 1, 2047 at 8:21:00AM".
|
||
|
||
:param fuzzy_with_tokens:
|
||
If `True`, `fuzzy` is automatically set to True, and the parser will
|
||
return a tuple where the first element is the parsed
|
||
`datetime.datetime` datetimestamp and the second element is a tuple
|
||
containing the portions of the string which were ignored, e.g.
|
||
"Today is January 1, 2047 at 8:21:00AM" should return
|
||
`(datetime.datetime(2011, 1, 1, 8, 21), (u'Today is ', u' ', u'at '))`
|
||
"""
|
||
if fuzzy_with_tokens:
|
||
fuzzy = True
|
||
|
||
info = self.info
|
||
|
||
if dayfirst is None:
|
||
dayfirst = info.dayfirst
|
||
|
||
if yearfirst is None:
|
||
yearfirst = info.yearfirst
|
||
|
||
res = self._result()
|
||
l = _timelex.split(timestr) # Splits the timestr into tokens
|
||
|
||
# keep up with the last token skipped so we can recombine
|
||
# consecutively skipped tokens (-2 for when i begins at 0).
|
||
last_skipped_token_i = -2
|
||
skipped_tokens = list()
|
||
|
||
try:
|
||
# year/month/day list
|
||
ymd = []
|
||
|
||
# Index of the month string in ymd
|
||
mstridx = -1
|
||
|
||
len_l = len(l)
|
||
i = 0
|
||
while i < len_l:
|
||
|
||
# Check if it's a number
|
||
try:
|
||
value_repr = l[i]
|
||
value = float(value_repr)
|
||
except ValueError:
|
||
value = None
|
||
|
||
if value is not None:
|
||
# Token is a number
|
||
len_li = len(l[i])
|
||
i += 1
|
||
|
||
if (len(ymd) == 3 and len_li in (2, 4)
|
||
and res.hour is None and (i >= len_l or (l[i] != ':' and
|
||
info.hms(l[i]) is None))):
|
||
# 19990101T23[59]
|
||
s = l[i-1]
|
||
res.hour = int(s[:2])
|
||
|
||
if len_li == 4:
|
||
res.minute = int(s[2:])
|
||
|
||
elif len_li == 6 or (len_li > 6 and l[i-1].find('.') == 6):
|
||
# YYMMDD or HHMMSS[.ss]
|
||
s = l[i-1]
|
||
|
||
if not ymd and l[i-1].find('.') == -1:
|
||
ymd.append(info.convertyear(int(s[:2])))
|
||
ymd.append(int(s[2:4]))
|
||
ymd.append(int(s[4:]))
|
||
else:
|
||
# 19990101T235959[.59]
|
||
res.hour = int(s[:2])
|
||
res.minute = int(s[2:4])
|
||
res.second, res.microsecond = _parsems(s[4:])
|
||
|
||
elif len_li == 8:
|
||
# YYYYMMDD
|
||
s = l[i-1]
|
||
ymd.append(int(s[:4]))
|
||
ymd.append(int(s[4:6]))
|
||
ymd.append(int(s[6:]))
|
||
|
||
elif len_li in (12, 14):
|
||
# YYYYMMDDhhmm[ss]
|
||
s = l[i-1]
|
||
ymd.append(int(s[:4]))
|
||
ymd.append(int(s[4:6]))
|
||
ymd.append(int(s[6:8]))
|
||
res.hour = int(s[8:10])
|
||
res.minute = int(s[10:12])
|
||
|
||
if len_li == 14:
|
||
res.second = int(s[12:])
|
||
|
||
elif ((i < len_l and info.hms(l[i]) is not None) or
|
||
(i+1 < len_l and l[i] == ' ' and
|
||
info.hms(l[i+1]) is not None)):
|
||
|
||
# HH[ ]h or MM[ ]m or SS[.ss][ ]s
|
||
if l[i] == ' ':
|
||
i += 1
|
||
|
||
idx = info.hms(l[i])
|
||
|
||
while True:
|
||
if idx == 0:
|
||
res.hour = int(value)
|
||
|
||
if value % 1:
|
||
res.minute = int(60*(value % 1))
|
||
|
||
elif idx == 1:
|
||
res.minute = int(value)
|
||
|
||
if value % 1:
|
||
res.second = int(60*(value % 1))
|
||
|
||
elif idx == 2:
|
||
res.second, res.microsecond = \
|
||
_parsems(value_repr)
|
||
|
||
i += 1
|
||
|
||
if i >= len_l or idx == 2:
|
||
break
|
||
|
||
# 12h00
|
||
try:
|
||
value_repr = l[i]
|
||
value = float(value_repr)
|
||
except ValueError:
|
||
break
|
||
else:
|
||
i += 1
|
||
idx += 1
|
||
|
||
if i < len_l:
|
||
newidx = info.hms(l[i])
|
||
|
||
if newidx is not None:
|
||
idx = newidx
|
||
|
||
elif (i == len_l and l[i-2] == ' ' and
|
||
info.hms(l[i-3]) is not None):
|
||
# X h MM or X m SS
|
||
idx = info.hms(l[i-3]) + 1
|
||
|
||
if idx == 1:
|
||
res.minute = int(value)
|
||
|
||
if value % 1:
|
||
res.second = int(60*(value % 1))
|
||
elif idx == 2:
|
||
res.second, res.microsecond = \
|
||
_parsems(value_repr)
|
||
i += 1
|
||
|
||
elif i+1 < len_l and l[i] == ':':
|
||
# HH:MM[:SS[.ss]]
|
||
res.hour = int(value)
|
||
i += 1
|
||
value = float(l[i])
|
||
res.minute = int(value)
|
||
|
||
if value % 1:
|
||
res.second = int(60*(value % 1))
|
||
|
||
i += 1
|
||
|
||
if i < len_l and l[i] == ':':
|
||
res.second, res.microsecond = _parsems(l[i+1])
|
||
i += 2
|
||
|
||
elif i < len_l and l[i] in ('-', '/', '.'):
|
||
sep = l[i]
|
||
ymd.append(int(value))
|
||
i += 1
|
||
|
||
if i < len_l and not info.jump(l[i]):
|
||
try:
|
||
# 01-01[-01]
|
||
ymd.append(int(l[i]))
|
||
except ValueError:
|
||
# 01-Jan[-01]
|
||
value = info.month(l[i])
|
||
|
||
if value is not None:
|
||
ymd.append(value)
|
||
assert mstridx == -1
|
||
mstridx = len(ymd)-1
|
||
else:
|
||
return None
|
||
|
||
i += 1
|
||
|
||
if i < len_l and l[i] == sep:
|
||
# We have three members
|
||
i += 1
|
||
value = info.month(l[i])
|
||
|
||
if value is not None:
|
||
ymd.append(value)
|
||
mstridx = len(ymd)-1
|
||
assert mstridx == -1
|
||
else:
|
||
ymd.append(int(l[i]))
|
||
|
||
i += 1
|
||
elif i >= len_l or info.jump(l[i]):
|
||
if i+1 < len_l and info.ampm(l[i+1]) is not None:
|
||
# 12 am
|
||
res.hour = int(value)
|
||
|
||
if res.hour < 12 and info.ampm(l[i+1]) == 1:
|
||
res.hour += 12
|
||
elif res.hour == 12 and info.ampm(l[i+1]) == 0:
|
||
res.hour = 0
|
||
|
||
i += 1
|
||
else:
|
||
# Year, month or day
|
||
ymd.append(int(value))
|
||
i += 1
|
||
elif info.ampm(l[i]) is not None:
|
||
|
||
# 12am
|
||
res.hour = int(value)
|
||
|
||
if res.hour < 12 and info.ampm(l[i]) == 1:
|
||
res.hour += 12
|
||
elif res.hour == 12 and info.ampm(l[i]) == 0:
|
||
res.hour = 0
|
||
i += 1
|
||
|
||
elif not fuzzy:
|
||
return None
|
||
else:
|
||
i += 1
|
||
continue
|
||
|
||
# Check weekday
|
||
value = info.weekday(l[i])
|
||
if value is not None:
|
||
res.weekday = value
|
||
i += 1
|
||
continue
|
||
|
||
# Check month name
|
||
value = info.month(l[i])
|
||
if value is not None:
|
||
ymd.append(value)
|
||
assert mstridx == -1
|
||
mstridx = len(ymd)-1
|
||
|
||
i += 1
|
||
if i < len_l:
|
||
if l[i] in ('-', '/'):
|
||
# Jan-01[-99]
|
||
sep = l[i]
|
||
i += 1
|
||
ymd.append(int(l[i]))
|
||
i += 1
|
||
|
||
if i < len_l and l[i] == sep:
|
||
# Jan-01-99
|
||
i += 1
|
||
ymd.append(int(l[i]))
|
||
i += 1
|
||
|
||
elif (i+3 < len_l and l[i] == l[i+2] == ' '
|
||
and info.pertain(l[i+1])):
|
||
# Jan of 01
|
||
# In this case, 01 is clearly year
|
||
try:
|
||
value = int(l[i+3])
|
||
except ValueError:
|
||
# Wrong guess
|
||
pass
|
||
else:
|
||
# Convert it here to become unambiguous
|
||
ymd.append(info.convertyear(value))
|
||
i += 4
|
||
continue
|
||
|
||
# Check am/pm
|
||
value = info.ampm(l[i])
|
||
if value is not None:
|
||
# For fuzzy parsing, 'a' or 'am' (both valid English words)
|
||
# may erroneously trigger the AM/PM flag. Deal with that
|
||
# here.
|
||
val_is_ampm = True
|
||
|
||
# If there's already an AM/PM flag, this one isn't one.
|
||
if fuzzy and res.ampm is not None:
|
||
val_is_ampm = False
|
||
|
||
# If AM/PM is found and hour is not, raise a ValueError
|
||
if res.hour is None:
|
||
if fuzzy:
|
||
val_is_ampm = False
|
||
else:
|
||
raise ValueError('No hour specified with ' +
|
||
'AM or PM flag.')
|
||
elif not 0 <= res.hour <= 12:
|
||
# If AM/PM is found, it's a 12 hour clock, so raise
|
||
# an error for invalid range
|
||
if fuzzy:
|
||
val_is_ampm = False
|
||
else:
|
||
raise ValueError('Invalid hour specified for ' +
|
||
'12-hour clock.')
|
||
|
||
if val_is_ampm:
|
||
if value == 1 and res.hour < 12:
|
||
res.hour += 12
|
||
elif value == 0 and res.hour == 12:
|
||
res.hour = 0
|
||
|
||
res.ampm = value
|
||
|
||
i += 1
|
||
continue
|
||
|
||
# Check for a timezone name
|
||
if (res.hour is not None and len(l[i]) <= 5 and
|
||
res.tzname is None and res.tzoffset is None and
|
||
not [x for x in l[i] if x not in
|
||
string.ascii_uppercase]):
|
||
res.tzname = l[i]
|
||
res.tzoffset = info.tzoffset(res.tzname)
|
||
i += 1
|
||
|
||
# Check for something like GMT+3, or BRST+3. Notice
|
||
# that it doesn't mean "I am 3 hours after GMT", but
|
||
# "my time +3 is GMT". If found, we reverse the
|
||
# logic so that timezone parsing code will get it
|
||
# right.
|
||
if i < len_l and l[i] in ('+', '-'):
|
||
l[i] = ('+', '-')[l[i] == '+']
|
||
res.tzoffset = None
|
||
if info.utczone(res.tzname):
|
||
# With something like GMT+3, the timezone
|
||
# is *not* GMT.
|
||
res.tzname = None
|
||
|
||
continue
|
||
|
||
# Check for a numbered timezone
|
||
if res.hour is not None and l[i] in ('+', '-'):
|
||
signal = (-1, 1)[l[i] == '+']
|
||
i += 1
|
||
len_li = len(l[i])
|
||
|
||
if len_li == 4:
|
||
# -0300
|
||
res.tzoffset = int(l[i][:2])*3600+int(l[i][2:])*60
|
||
elif i+1 < len_l and l[i+1] == ':':
|
||
# -03:00
|
||
res.tzoffset = int(l[i])*3600+int(l[i+2])*60
|
||
i += 2
|
||
elif len_li <= 2:
|
||
# -[0]3
|
||
res.tzoffset = int(l[i][:2])*3600
|
||
else:
|
||
return None
|
||
i += 1
|
||
|
||
res.tzoffset *= signal
|
||
|
||
# Look for a timezone name between parenthesis
|
||
if (i+3 < len_l and
|
||
info.jump(l[i]) and l[i+1] == '(' and l[i+3] == ')' and
|
||
3 <= len(l[i+2]) <= 5 and
|
||
not [x for x in l[i+2]
|
||
if x not in string.ascii_uppercase]):
|
||
# -0300 (BRST)
|
||
res.tzname = l[i+2]
|
||
i += 4
|
||
continue
|
||
|
||
# Check jumps
|
||
if not (info.jump(l[i]) or fuzzy):
|
||
return None
|
||
|
||
if last_skipped_token_i == i - 1:
|
||
# recombine the tokens
|
||
skipped_tokens[-1] += l[i]
|
||
else:
|
||
# just append
|
||
skipped_tokens.append(l[i])
|
||
last_skipped_token_i = i
|
||
i += 1
|
||
|
||
# Process year/month/day
|
||
len_ymd = len(ymd)
|
||
if len_ymd > 3:
|
||
# More than three members!?
|
||
return None
|
||
elif len_ymd == 1 or (mstridx != -1 and len_ymd == 2):
|
||
# One member, or two members with a month string
|
||
if mstridx != -1:
|
||
res.month = ymd[mstridx]
|
||
del ymd[mstridx]
|
||
|
||
if len_ymd > 1 or mstridx == -1:
|
||
if ymd[0] > 31:
|
||
res.year = ymd[0]
|
||
else:
|
||
res.day = ymd[0]
|
||
|
||
elif len_ymd == 2:
|
||
# Two members with numbers
|
||
if ymd[0] > 31:
|
||
# 99-01
|
||
res.year, res.month = ymd
|
||
elif ymd[1] > 31:
|
||
# 01-99
|
||
res.month, res.year = ymd
|
||
elif dayfirst and ymd[1] <= 12:
|
||
# 13-01
|
||
res.day, res.month = ymd
|
||
else:
|
||
# 01-13
|
||
res.month, res.day = ymd
|
||
|
||
elif len_ymd == 3:
|
||
# Three members
|
||
if mstridx == 0:
|
||
res.month, res.day, res.year = ymd
|
||
elif mstridx == 1:
|
||
if ymd[0] > 31 or (yearfirst and ymd[2] <= 31):
|
||
# 99-Jan-01
|
||
res.year, res.month, res.day = ymd
|
||
else:
|
||
# 01-Jan-01
|
||
# Give precendence to day-first, since
|
||
# two-digit years is usually hand-written.
|
||
res.day, res.month, res.year = ymd
|
||
|
||
elif mstridx == 2:
|
||
# WTF!?
|
||
if ymd[1] > 31:
|
||
# 01-99-Jan
|
||
res.day, res.year, res.month = ymd
|
||
else:
|
||
# 99-01-Jan
|
||
res.year, res.day, res.month = ymd
|
||
|
||
else:
|
||
if ymd[0] > 31 or \
|
||
(yearfirst and ymd[1] <= 12 and ymd[2] <= 31):
|
||
# 99-01-01
|
||
res.year, res.month, res.day = ymd
|
||
elif ymd[0] > 12 or (dayfirst and ymd[1] <= 12):
|
||
# 13-01-01
|
||
res.day, res.month, res.year = ymd
|
||
else:
|
||
# 01-13-01
|
||
res.month, res.day, res.year = ymd
|
||
|
||
except (IndexError, ValueError, AssertionError):
|
||
return None
|
||
|
||
if not info.validate(res):
|
||
return None
|
||
|
||
if fuzzy_with_tokens:
|
||
return res, tuple(skipped_tokens)
|
||
else:
|
||
return res
|
||
|
||
DEFAULTPARSER = parser()
|
||
|
||
|
||
def parse(timestr, parserinfo=None, **kwargs):
|
||
"""
|
||
Parse a string in one of the supported formats, using the `parserinfo`
|
||
parameters.
|
||
|
||
:param timestr:
|
||
A string containing a date/time stamp.
|
||
|
||
:param parserinfo:
|
||
A :class:`parserinfo` object containing parameters for the parser.
|
||
If `None`, the default arguments to the `parserinfo` constructor are
|
||
used.
|
||
|
||
The `**kwargs` parameter takes the following keyword arguments:
|
||
|
||
:param default:
|
||
The default datetime object, if this is a datetime object and not
|
||
`None`, elements specified in `timestr` replace elements in the
|
||
default object.
|
||
|
||
:param ignoretz:
|
||
Whether or not to ignore the time zone (boolean).
|
||
|
||
:param tzinfos:
|
||
A time zone, to be applied to the date, if `ignoretz` is `True`.
|
||
This can be either a subclass of `tzinfo`, a time zone string or an
|
||
integer offset.
|
||
|
||
:param dayfirst:
|
||
Whether to interpret the first value in an ambiguous 3-integer date
|
||
(e.g. 01/05/09) as the day (`True`) or month (`False`). If
|
||
`yearfirst` is set to `True`, this distinguishes between YDM and
|
||
YMD. If set to `None`, this value is retrieved from the current
|
||
:class:`parserinfo` object (which itself defaults to `False`).
|
||
|
||
:param yearfirst:
|
||
Whether to interpret the first value in an ambiguous 3-integer date
|
||
(e.g. 01/05/09) as the year. If `True`, the first number is taken to
|
||
be the year, otherwise the last number is taken to be the year. If
|
||
this is set to `None`, the value is retrieved from the current
|
||
:class:`parserinfo` object (which itself defaults to `False`).
|
||
|
||
:param fuzzy:
|
||
Whether to allow fuzzy parsing, allowing for string like "Today is
|
||
January 1, 2047 at 8:21:00AM".
|
||
|
||
:param fuzzy_with_tokens:
|
||
If `True`, `fuzzy` is automatically set to True, and the parser will
|
||
return a tuple where the first element is the parsed
|
||
`datetime.datetime` datetimestamp and the second element is a tuple
|
||
containing the portions of the string which were ignored, e.g.
|
||
"Today is January 1, 2047 at 8:21:00AM" should return
|
||
`(datetime.datetime(2011, 1, 1, 8, 21), (u'Today is ', u' ', u'at '))`
|
||
"""
|
||
if parserinfo:
|
||
return parser(parserinfo).parse(timestr, **kwargs)
|
||
else:
|
||
return DEFAULTPARSER.parse(timestr, **kwargs)
|
||
|
||
|
||
class _tzparser(object):
|
||
|
||
class _result(_resultbase):
|
||
|
||
__slots__ = ["stdabbr", "stdoffset", "dstabbr", "dstoffset",
|
||
"start", "end"]
|
||
|
||
class _attr(_resultbase):
|
||
__slots__ = ["month", "week", "weekday",
|
||
"yday", "jyday", "day", "time"]
|
||
|
||
def __repr__(self):
|
||
return self._repr("")
|
||
|
||
def __init__(self):
|
||
_resultbase.__init__(self)
|
||
self.start = self._attr()
|
||
self.end = self._attr()
|
||
|
||
def parse(self, tzstr):
|
||
res = self._result()
|
||
l = _timelex.split(tzstr)
|
||
try:
|
||
|
||
len_l = len(l)
|
||
|
||
i = 0
|
||
while i < len_l:
|
||
# BRST+3[BRDT[+2]]
|
||
j = i
|
||
while j < len_l and not [x for x in l[j]
|
||
if x in "0123456789:,-+"]:
|
||
j += 1
|
||
if j != i:
|
||
if not res.stdabbr:
|
||
offattr = "stdoffset"
|
||
res.stdabbr = "".join(l[i:j])
|
||
else:
|
||
offattr = "dstoffset"
|
||
res.dstabbr = "".join(l[i:j])
|
||
i = j
|
||
if (i < len_l and (l[i] in ('+', '-') or l[i][0] in
|
||
"0123456789")):
|
||
if l[i] in ('+', '-'):
|
||
# Yes, that's right. See the TZ variable
|
||
# documentation.
|
||
signal = (1, -1)[l[i] == '+']
|
||
i += 1
|
||
else:
|
||
signal = -1
|
||
len_li = len(l[i])
|
||
if len_li == 4:
|
||
# -0300
|
||
setattr(res, offattr, (int(l[i][:2])*3600 +
|
||
int(l[i][2:])*60)*signal)
|
||
elif i+1 < len_l and l[i+1] == ':':
|
||
# -03:00
|
||
setattr(res, offattr,
|
||
(int(l[i])*3600+int(l[i+2])*60)*signal)
|
||
i += 2
|
||
elif len_li <= 2:
|
||
# -[0]3
|
||
setattr(res, offattr,
|
||
int(l[i][:2])*3600*signal)
|
||
else:
|
||
return None
|
||
i += 1
|
||
if res.dstabbr:
|
||
break
|
||
else:
|
||
break
|
||
|
||
if i < len_l:
|
||
for j in range(i, len_l):
|
||
if l[j] == ';':
|
||
l[j] = ','
|
||
|
||
assert l[i] == ','
|
||
|
||
i += 1
|
||
|
||
if i >= len_l:
|
||
pass
|
||
elif (8 <= l.count(',') <= 9 and
|
||
not [y for x in l[i:] if x != ','
|
||
for y in x if y not in "0123456789"]):
|
||
# GMT0BST,3,0,30,3600,10,0,26,7200[,3600]
|
||
for x in (res.start, res.end):
|
||
x.month = int(l[i])
|
||
i += 2
|
||
if l[i] == '-':
|
||
value = int(l[i+1])*-1
|
||
i += 1
|
||
else:
|
||
value = int(l[i])
|
||
i += 2
|
||
if value:
|
||
x.week = value
|
||
x.weekday = (int(l[i])-1) % 7
|
||
else:
|
||
x.day = int(l[i])
|
||
i += 2
|
||
x.time = int(l[i])
|
||
i += 2
|
||
if i < len_l:
|
||
if l[i] in ('-', '+'):
|
||
signal = (-1, 1)[l[i] == "+"]
|
||
i += 1
|
||
else:
|
||
signal = 1
|
||
res.dstoffset = (res.stdoffset+int(l[i]))*signal
|
||
elif (l.count(',') == 2 and l[i:].count('/') <= 2 and
|
||
not [y for x in l[i:] if x not in (',', '/', 'J', 'M',
|
||
'.', '-', ':')
|
||
for y in x if y not in "0123456789"]):
|
||
for x in (res.start, res.end):
|
||
if l[i] == 'J':
|
||
# non-leap year day (1 based)
|
||
i += 1
|
||
x.jyday = int(l[i])
|
||
elif l[i] == 'M':
|
||
# month[-.]week[-.]weekday
|
||
i += 1
|
||
x.month = int(l[i])
|
||
i += 1
|
||
assert l[i] in ('-', '.')
|
||
i += 1
|
||
x.week = int(l[i])
|
||
if x.week == 5:
|
||
x.week = -1
|
||
i += 1
|
||
assert l[i] in ('-', '.')
|
||
i += 1
|
||
x.weekday = (int(l[i])-1) % 7
|
||
else:
|
||
# year day (zero based)
|
||
x.yday = int(l[i])+1
|
||
|
||
i += 1
|
||
|
||
if i < len_l and l[i] == '/':
|
||
i += 1
|
||
# start time
|
||
len_li = len(l[i])
|
||
if len_li == 4:
|
||
# -0300
|
||
x.time = (int(l[i][:2])*3600+int(l[i][2:])*60)
|
||
elif i+1 < len_l and l[i+1] == ':':
|
||
# -03:00
|
||
x.time = int(l[i])*3600+int(l[i+2])*60
|
||
i += 2
|
||
if i+1 < len_l and l[i+1] == ':':
|
||
i += 2
|
||
x.time += int(l[i])
|
||
elif len_li <= 2:
|
||
# -[0]3
|
||
x.time = (int(l[i][:2])*3600)
|
||
else:
|
||
return None
|
||
i += 1
|
||
|
||
assert i == len_l or l[i] == ','
|
||
|
||
i += 1
|
||
|
||
assert i >= len_l
|
||
|
||
except (IndexError, ValueError, AssertionError):
|
||
return None
|
||
|
||
return res
|
||
|
||
|
||
DEFAULTTZPARSER = _tzparser()
|
||
|
||
|
||
def _parsetz(tzstr):
|
||
return DEFAULTTZPARSER.parse(tzstr)
|
||
|
||
|
||
def _parsems(value):
|
||
"""Parse a I[.F] seconds value into (seconds, microseconds)."""
|
||
if "." not in value:
|
||
return int(value), 0
|
||
else:
|
||
i, f = value.split(".")
|
||
return int(i), int(f.ljust(6, "0")[:6])
|
||
|
||
|
||
# vim:ts=4:sw=4:et
|