basic subscriptions system

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diff --git a/python/dateutil/parser.py b/python/dateutil/parser.py
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+# -*- coding: utf-8 -*-
+"""
+This module offers a generic date/time string parser which is able to parse
+most known formats to represent a date and/or time.
+
+This module attempts to be forgiving with regards to unlikely input formats,
+returning a datetime object even for dates which are ambiguous. If an element
+of a date/time stamp is omitted, the following rules are applied:
+- If AM or PM is left unspecified, a 24-hour clock is assumed, however, an hour
+  on a 12-hour clock (``0 <= hour <= 12``) *must* be specified if AM or PM is
+  specified.
+- If a time zone is omitted, a timezone-naive datetime is returned.
+
+If any other elements are missing, they are taken from the
+:class:`datetime.datetime` object passed to the parameter ``default``. If this
+results in a day number exceeding the valid number of days per month, the
+value falls back to the end of the month.
+
+Additional resources about date/time string formats can be found below:
+
+- `A summary of the international standard date and time notation
+  <http://www.cl.cam.ac.uk/~mgk25/iso-time.html>`_
+- `W3C Date and Time Formats <http://www.w3.org/TR/NOTE-datetime>`_
+- `Time Formats (Planetary Rings Node) <http://pds-rings.seti.org/tools/time_formats.html>`_
+- `CPAN ParseDate module
+  <http://search.cpan.org/~muir/Time-modules-2013.0912/lib/Time/ParseDate.pm>`_
+- `Java SimpleDateFormat Class
+  <https://docs.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html>`_
+"""
+from __future__ import unicode_literals
+
+import datetime
+import string
+import time
+import collections
+import re
+from io import StringIO
+from calendar import monthrange
+
+from six import text_type, binary_type, integer_types
+
+from . import relativedelta
+from . import tz
+
+__all__ = ["parse", "parserinfo"]
+
+
+class _timelex(object):
+    # Fractional seconds are sometimes split by a comma
+    _split_decimal = re.compile("([.,])")
+
+    def __init__(self, instream):
+        if isinstance(instream, binary_type):
+            instream = instream.decode()
+
+        if isinstance(instream, text_type):
+            instream = StringIO(instream)
+
+        if getattr(instream, 'read', None) is None:
+            raise TypeError('Parser must be a string or character stream, not '
+                            '{itype}'.format(itype=instream.__class__.__name__))
+
+        self.instream = instream
+        self.charstack = []
+        self.tokenstack = []
+        self.eof = False
+
+    def get_token(self):
+        """
+        This function breaks the time string into lexical units (tokens), which
+        can be parsed by the parser. Lexical units are demarcated by changes in
+        the character set, so any continuous string of letters is considered
+        one unit, any continuous string of numbers is considered one unit.
+
+        The main complication arises from the fact that dots ('.') can be used
+        both as separators (e.g. "Sep.20.2009") or decimal points (e.g.
+        "4:30:21.447"). As such, it is necessary to read the full context of
+        any dot-separated strings before breaking it into tokens; as such, this
+        function maintains a "token stack", for when the ambiguous context
+        demands that multiple tokens be parsed at once.
+        """
+        if self.tokenstack:
+            return self.tokenstack.pop(0)
+
+        seenletters = False
+        token = None
+        state = None
+
+        while not self.eof:
+            # We only realize that we've reached the end of a token when we
+            # find a character that's not part of the current token - since
+            # that character may be part of the next token, it's stored in the
+            # charstack.
+            if self.charstack:
+                nextchar = self.charstack.pop(0)
+            else:
+                nextchar = self.instream.read(1)
+                while nextchar == '\x00':
+                    nextchar = self.instream.read(1)
+
+            if not nextchar:
+                self.eof = True
+                break
+            elif not state:
+                # First character of the token - determines if we're starting
+                # to parse a word, a number or something else.
+                token = nextchar
+                if self.isword(nextchar):
+                    state = 'a'
+                elif self.isnum(nextchar):
+                    state = '0'
+                elif self.isspace(nextchar):
+                    token = ' '
+                    break  # emit token
+                else:
+                    break  # emit token
+            elif state == 'a':
+                # If we've already started reading a word, we keep reading
+                # letters until we find something that's not part of a word.
+                seenletters = True
+                if self.isword(nextchar):
+                    token += nextchar
+                elif nextchar == '.':
+                    token += nextchar
+                    state = 'a.'
+                else:
+                    self.charstack.append(nextchar)
+                    break  # emit token
+            elif state == '0':
+                # If we've already started reading a number, we keep reading
+                # numbers until we find something that doesn't fit.
+                if self.isnum(nextchar):
+                    token += nextchar
+                elif nextchar == '.' or (nextchar == ',' and len(token) >= 2):
+                    token += nextchar
+                    state = '0.'
+                else:
+                    self.charstack.append(nextchar)
+                    break  # emit token
+            elif state == 'a.':
+                # If we've seen some letters and a dot separator, continue
+                # parsing, and the tokens will be broken up later.
+                seenletters = True
+                if nextchar == '.' or self.isword(nextchar):
+                    token += nextchar
+                elif self.isnum(nextchar) and token[-1] == '.':
+                    token += nextchar
+                    state = '0.'
+                else:
+                    self.charstack.append(nextchar)
+                    break  # emit token
+            elif state == '0.':
+                # If we've seen at least one dot separator, keep going, we'll
+                # break up the tokens later.
+                if nextchar == '.' or self.isnum(nextchar):
+                    token += nextchar
+                elif self.isword(nextchar) and token[-1] == '.':
+                    token += nextchar
+                    state = 'a.'
+                else:
+                    self.charstack.append(nextchar)
+                    break  # emit token
+
+        if (state in ('a.', '0.') and (seenletters or token.count('.') > 1 or
+                                       token[-1] in '.,')):
+            l = self._split_decimal.split(token)
+            token = l[0]
+            for tok in l[1:]:
+                if tok:
+                    self.tokenstack.append(tok)
+
+        if state == '0.' and token.count('.') == 0:
+            token = token.replace(',', '.')
+
+        return token
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        token = self.get_token()
+        if token is None:
+            raise StopIteration
+
+        return token
+
+    def next(self):
+        return self.__next__()  # Python 2.x support
+
+    @classmethod
+    def split(cls, s):
+        return list(cls(s))
+
+    @classmethod
+    def isword(cls, nextchar):
+        """ Whether or not the next character is part of a word """
+        return nextchar.isalpha()
+
+    @classmethod
+    def isnum(cls, nextchar):
+        """ Whether the next character is part of a number """
+        return nextchar.isdigit()
+
+    @classmethod
+    def isspace(cls, nextchar):
+        """ Whether the next character is whitespace """
+        return nextchar.isspace()
+
+
+class _resultbase(object):
+
+    def __init__(self):
+        for attr in self.__slots__:
+            setattr(self, attr, None)
+
+    def _repr(self, classname):
+        l = []
+        for attr in self.__slots__:
+            value = getattr(self, attr)
+            if value is not None:
+                l.append("%s=%s" % (attr, repr(value)))
+        return "%s(%s)" % (classname, ", ".join(l))
+
+    def __len__(self):
+        return (sum(getattr(self, attr) is not None
+                    for attr in self.__slots__))
+
+    def __repr__(self):
+        return self._repr(self.__class__.__name__)
+
+
+class parserinfo(object):
+    """
+    Class which handles what inputs are accepted. Subclass this to customize
+    the language and acceptable values for each parameter.
+
+    :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. Default is ``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.
+            Default is ``False``.
+    """
+
+    # m from a.m/p.m, t from ISO T separator
+    JUMP = [" ", ".", ",", ";", "-", "/", "'",
+            "at", "on", "and", "ad", "m", "t", "of",
+            "st", "nd", "rd", "th"]
+
+    WEEKDAYS = [("Mon", "Monday"),
+                ("Tue", "Tuesday"),
+                ("Wed", "Wednesday"),
+                ("Thu", "Thursday"),
+                ("Fri", "Friday"),
+                ("Sat", "Saturday"),
+                ("Sun", "Sunday")]
+    MONTHS = [("Jan", "January"),
+              ("Feb", "February"),
+              ("Mar", "March"),
+              ("Apr", "April"),
+              ("May", "May"),
+              ("Jun", "June"),
+              ("Jul", "July"),
+              ("Aug", "August"),
+              ("Sep", "Sept", "September"),
+              ("Oct", "October"),
+              ("Nov", "November"),
+              ("Dec", "December")]
+    HMS = [("h", "hour", "hours"),
+           ("m", "minute", "minutes"),
+           ("s", "second", "seconds")]
+    AMPM = [("am", "a"),
+            ("pm", "p")]
+    UTCZONE = ["UTC", "GMT", "Z"]
+    PERTAIN = ["of"]
+    TZOFFSET = {}
+
+    def __init__(self, dayfirst=False, yearfirst=False):
+        self._jump = self._convert(self.JUMP)
+        self._weekdays = self._convert(self.WEEKDAYS)
+        self._months = self._convert(self.MONTHS)
+        self._hms = self._convert(self.HMS)
+        self._ampm = self._convert(self.AMPM)
+        self._utczone = self._convert(self.UTCZONE)
+        self._pertain = self._convert(self.PERTAIN)
+
+        self.dayfirst = dayfirst
+        self.yearfirst = yearfirst
+
+        self._year = time.localtime().tm_year
+        self._century = self._year // 100 * 100
+
+    def _convert(self, lst):
+        dct = {}
+        for i, v in enumerate(lst):
+            if isinstance(v, tuple):
+                for v in v:
+                    dct[v.lower()] = i
+            else:
+                dct[v.lower()] = i
+        return dct
+
+    def jump(self, name):
+        return name.lower() in self._jump
+
+    def weekday(self, name):
+        if len(name) >= min(len(n) for n in self._weekdays.keys()):
+            try:
+                return self._weekdays[name.lower()]
+            except KeyError:
+                pass
+        return None
+
+    def month(self, name):
+        if len(name) >= min(len(n) for n in self._months.keys()):
+            try:
+                return self._months[name.lower()] + 1
+            except KeyError:
+                pass
+        return None
+
+    def hms(self, name):
+        try:
+            return self._hms[name.lower()]
+        except KeyError:
+            return None
+
+    def ampm(self, name):
+        try:
+            return self._ampm[name.lower()]
+        except KeyError:
+            return None
+
+    def pertain(self, name):
+        return name.lower() in self._pertain
+
+    def utczone(self, name):
+        return name.lower() in self._utczone
+
+    def tzoffset(self, name):
+        if name in self._utczone:
+            return 0
+
+        return self.TZOFFSET.get(name)
+
+    def convertyear(self, year, century_specified=False):
+        if year < 100 and not century_specified:
+            year += self._century
+            if abs(year - self._year) >= 50:
+                if year < self._year:
+                    year += 100
+                else:
+                    year -= 100
+        return year
+
+    def validate(self, res):
+        # move to info
+        if res.year is not None:
+            res.year = self.convertyear(res.year, res.century_specified)
+
+        if res.tzoffset == 0 and not res.tzname or res.tzname == 'Z':
+            res.tzname = "UTC"
+            res.tzoffset = 0
+        elif res.tzoffset != 0 and res.tzname and self.utczone(res.tzname):
+            res.tzoffset = 0
+        return True
+
+
+class _ymd(list):
+    def __init__(self, tzstr, *args, **kwargs):
+        super(self.__class__, self).__init__(*args, **kwargs)
+        self.century_specified = False
+        self.tzstr = tzstr
+
+    @staticmethod
+    def token_could_be_year(token, year):
+        try:
+            return int(token) == year
+        except ValueError:
+            return False
+
+    @staticmethod
+    def find_potential_year_tokens(year, tokens):
+        return [token for token in tokens if _ymd.token_could_be_year(token, year)]
+
+    def find_probable_year_index(self, tokens):
+        """
+        attempt to deduce if a pre 100 year was lost
+         due to padded zeros being taken off
+        """
+        for index, token in enumerate(self):
+            potential_year_tokens = _ymd.find_potential_year_tokens(token, tokens)
+            if len(potential_year_tokens) == 1 and len(potential_year_tokens[0]) > 2:
+                return index
+
+    def append(self, val):
+        if hasattr(val, '__len__'):
+            if val.isdigit() and len(val) > 2:
+                self.century_specified = True
+        elif val > 100:
+            self.century_specified = True
+
+        super(self.__class__, self).append(int(val))
+
+    def resolve_ymd(self, mstridx, yearfirst, dayfirst):
+        len_ymd = len(self)
+        year, month, day = (None, None, None)
+
+        if len_ymd > 3:
+            raise ValueError("More than three YMD values")
+        elif len_ymd == 1 or (mstridx != -1 and len_ymd == 2):
+            # One member, or two members with a month string
+            if mstridx != -1:
+                month = self[mstridx]
+                del self[mstridx]
+
+            if len_ymd > 1 or mstridx == -1:
+                if self[0] > 31:
+                    year = self[0]
+                else:
+                    day = self[0]
+
+        elif len_ymd == 2:
+            # Two members with numbers
+            if self[0] > 31:
+                # 99-01
+                year, month = self
+            elif self[1] > 31:
+                # 01-99
+                month, year = self
+            elif dayfirst and self[1] <= 12:
+                # 13-01
+                day, month = self
+            else:
+                # 01-13
+                month, day = self
+
+        elif len_ymd == 3:
+            # Three members
+            if mstridx == 0:
+                month, day, year = self
+            elif mstridx == 1:
+                if self[0] > 31 or (yearfirst and self[2] <= 31):
+                    # 99-Jan-01
+                    year, month, day = self
+                else:
+                    # 01-Jan-01
+                    # Give precendence to day-first, since
+                    # two-digit years is usually hand-written.
+                    day, month, year = self
+
+            elif mstridx == 2:
+                # WTF!?
+                if self[1] > 31:
+                    # 01-99-Jan
+                    day, year, month = self
+                else:
+                    # 99-01-Jan
+                    year, day, month = self
+
+            else:
+                if self[0] > 31 or \
+                    self.find_probable_year_index(_timelex.split(self.tzstr)) == 0 or \
+                   (yearfirst and self[1] <= 12 and self[2] <= 31):
+                    # 99-01-01
+                    if dayfirst and self[2] <= 12:
+                        year, day, month = self
+                    else:
+                        year, month, day = self
+                elif self[0] > 12 or (dayfirst and self[1] <= 12):
+                    # 13-01-01
+                    day, month, year = self
+                else:
+                    # 01-13-01
+                    month, day, year = self
+
+        return year, month, day
+
+
+class parser(object):
+    def __init__(self, info=None):
+        self.info = info or parserinfo()
+
+    def parse(self, timestr, default=None, ignoretz=False, tzinfos=None, **kwargs):
+        """
+        Parse the date/time string into a :class:`datetime.datetime` object.
+
+        :param timestr:
+            Any date/time string using the supported formats.
+
+        :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:
+            If set ``True``, time zones in parsed strings are ignored and a
+            naive :class:`datetime.datetime` object is returned.
+
+        :param tzinfos:
+            Additional time zone names / aliases which may be present in the
+            string. This argument maps time zone names (and optionally offsets
+            from those time zones) to time zones. This parameter can be a
+            dictionary with timezone aliases mapping time zone names to time
+            zones or a function taking two parameters (``tzname`` and
+            ``tzoffset``) and returning a time zone.
+
+            The timezones to which the names are mapped can be an integer
+            offset from UTC in minutes or a :class:`tzinfo` object.
+
+            .. doctest::
+               :options: +NORMALIZE_WHITESPACE
+
+                >>> from dateutil.parser import parse
+                >>> from dateutil.tz import gettz
+                >>> tzinfos = {"BRST": -10800, "CST": gettz("America/Chicago")}
+                >>> parse("2012-01-19 17:21:00 BRST", tzinfos=tzinfos)
+                datetime.datetime(2012, 1, 19, 17, 21, tzinfo=tzoffset(u'BRST', -10800))
+                >>> parse("2012-01-19 17:21:00 CST", tzinfos=tzinfos)
+                datetime.datetime(2012, 1, 19, 17, 21,
+                                  tzinfo=tzfile('/usr/share/zoneinfo/America/Chicago'))
+
+            This parameter is ignored if ``ignoretz`` is set.
+
+        :param **kwargs:
+            Keyword arguments as passed to ``_parse()``.
+
+        :return:
+            Returns a :class:`datetime.datetime` object or, if the
+            ``fuzzy_with_tokens`` option is ``True``, returns a tuple, the
+            first element being a :class:`datetime.datetime` object, the second
+            a tuple containing the fuzzy tokens.
+
+        :raises ValueError:
+            Raised for invalid or unknown string format, if the provided
+            :class:`tzinfo` is not in a valid format, or if an invalid date
+            would be created.
+
+        :raises TypeError:
+            Raised for non-string or character stream input.
+
+        :raises OverflowError:
+            Raised if the parsed date exceeds the largest valid C integer on
+            your system.
+        """
+
+        if default is None:
+            default = datetime.datetime.now().replace(hour=0, minute=0,
+                                                      second=0, microsecond=0)
+
+        res, skipped_tokens = self._parse(timestr, **kwargs)
+
+        if res is None:
+            raise ValueError("Unknown string format")
+
+        if len(res) == 0:
+            raise ValueError("String does not contain a date.")
+
+        repl = {}
+        for attr in ("year", "month", "day", "hour",
+                     "minute", "second", "microsecond"):
+            value = getattr(res, attr)
+            if value is not None:
+                repl[attr] = value
+
+        if '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 :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
+            :class:`datetime.datetime` datetimestamp and the second element is
+            a tuple containing the portions of the string which were ignored:
+
+            .. doctest::
+
+                >>> from dateutil.parser import parse
+                >>> parse("Today is January 1, 2047 at 8:21:00AM", fuzzy_with_tokens=True)
+                (datetime.datetime(2047, 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 = _ymd(timestr)
+
+            # 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(s[:2])
+                            ymd.append(s[2:4])
+                            ymd.append(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 in (8, 12, 14):
+                        # YYYYMMDD
+                        s = l[i-1]
+                        ymd.append(s[:4])
+                        ymd.append(s[4:6])
+                        ymd.append(s[6:8])
+
+                        if len_li > 8:
+                            res.hour = int(s[8:10])
+                            res.minute = int(s[10:12])
+
+                            if len_li > 12:
+                                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])
+
+                        if idx == 0:               # h
+                            res.minute = int(value)
+
+                            sec_remainder = value % 1
+                            if sec_remainder:
+                                res.second = int(60 * sec_remainder)
+                        elif idx == 1:             # m
+                            res.second, res.microsecond = \
+                                _parsems(value_repr)
+
+                        # We don't need to advance the tokens here because the
+                        # i == len_l call indicates that we're looking at all
+                        # the tokens already.
+
+                    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(value_repr)
+                        i += 1
+
+                        if i < len_l and not info.jump(l[i]):
+                            try:
+                                # 01-01[-01]
+                                ymd.append(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, 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(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(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, 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(l[i])
+                            i += 1
+
+                            if i < len_l and l[i] == sep:
+                                # Jan-01-99
+                                i += 1
+                                ymd.append(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(str(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
+
+                    elif fuzzy:
+                        last_skipped_token_i = self._skip_token(skipped_tokens,
+                                                    last_skipped_token_i, i, l)
+                    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, 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, None
+
+                last_skipped_token_i = self._skip_token(skipped_tokens,
+                                                last_skipped_token_i, i, l)
+                i += 1
+
+            # Process year/month/day
+            year, month, day = ymd.resolve_ymd(mstridx, yearfirst, dayfirst)
+            if year is not None:
+                res.year = year
+                res.century_specified = ymd.century_specified
+
+            if month is not None:
+                res.month = month
+
+            if day is not None:
+                res.day = day
+
+        except (IndexError, ValueError, AssertionError):
+            return None, None
+
+        if not info.validate(res):
+            return None, None
+
+        if fuzzy_with_tokens:
+            return res, tuple(skipped_tokens)
+        else:
+            return res, None
+
+    @staticmethod
+    def _skip_token(skipped_tokens, last_skipped_token_i, i, l):
+        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
+        return last_skipped_token_i
+
+
+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 :class:`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:
+        If set ``True``, time zones in parsed strings are ignored and a naive
+        :class:`datetime` object is returned.
+
+    :param tzinfos:
+            Additional time zone names / aliases which may be present in the
+            string. This argument maps time zone names (and optionally offsets
+            from those time zones) to time zones. This parameter can be a
+            dictionary with timezone aliases mapping time zone names to time
+            zones or a function taking two parameters (``tzname`` and
+            ``tzoffset``) and returning a time zone.
+
+            The timezones to which the names are mapped can be an integer
+            offset from UTC in minutes or a :class:`tzinfo` object.
+
+            .. doctest::
+               :options: +NORMALIZE_WHITESPACE
+
+                >>> from dateutil.parser import parse
+                >>> from dateutil.tz import gettz
+                >>> tzinfos = {"BRST": -10800, "CST": gettz("America/Chicago")}
+                >>> parse("2012-01-19 17:21:00 BRST", tzinfos=tzinfos)
+                datetime.datetime(2012, 1, 19, 17, 21, tzinfo=tzoffset(u'BRST', -10800))
+                >>> parse("2012-01-19 17:21:00 CST", tzinfos=tzinfos)
+                datetime.datetime(2012, 1, 19, 17, 21,
+                                  tzinfo=tzfile('/usr/share/zoneinfo/America/Chicago'))
+
+            This parameter is ignored if ``ignoretz`` is set.
+
+    :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
+        :class:`datetime.datetime` datetimestamp and the second element is
+        a tuple containing the portions of the string which were ignored:
+
+        .. doctest::
+
+            >>> from dateutil.parser import parse
+            >>> parse("Today is January 1, 2047 at 8:21:00AM", fuzzy_with_tokens=True)
+            (datetime.datetime(2047, 1, 1, 8, 21), (u'Today is ', u' ', u'at '))
+
+    :return:
+        Returns a :class:`datetime.datetime` object or, if the
+        ``fuzzy_with_tokens`` option is ``True``, returns a tuple, the
+        first element being a :class:`datetime.datetime` object, the second
+        a tuple containing the fuzzy tokens.
+
+    :raises ValueError:
+        Raised for invalid or unknown string format, if the provided
+        :class:`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
+        your system.
+    """
+    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