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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
<https://www.cl.cam.ac.uk/~mgk25/iso-time.html>`_
- `W3C Date and Time Formats <https://www.w3.org/TR/NOTE-datetime>`_
- `Time Formats (Planetary Rings Node) <https://pds-rings.seti.org:443/tools/time_formats.html>`_
- `CPAN ParseDate module
<https://metacpan.org/pod/release/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 re
import string
import time
import warnings
from calendar import monthrange
from io import StringIO
import six
from six import integer_types, text_type
from decimal import Decimal
from warnings import warn
from .. import relativedelta
from .. import tz
__all__ = ["parse", "parserinfo", "ParserError"]
# TODO: pandas.core.tools.datetimes imports this explicitly. Might be worth
# making public and/or figuring out if there is something we can
# take off their plate.
class _timelex(object):
# Fractional seconds are sometimes split by a comma
_split_decimal = re.compile("([.,])")
def __init__(self, instream):
if isinstance(instream, (bytes, bytearray)):
instream = instream.decode()
if isinstance(instream, text_type):
instream = StringIO(instream)
elif 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"), # TODO: "Tues"
("Wed", "Wednesday"),
("Thu", "Thursday"), # TODO: "Thurs"
("Fri", "Friday"),
("Sat", "Saturday"),
("Sun", "Sunday")]
MONTHS = [("Jan", "January"),
("Feb", "February"), # TODO: "Febr"
("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", "z"]
PERTAIN = ["of"]
TZOFFSET = {}
# TODO: ERA = ["AD", "BC", "CE", "BCE", "Stardate",
# "Anno Domini", "Year of Our Lord"]
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):
try:
return self._weekdays[name.lower()]
except KeyError:
pass
return None
def month(self, name):
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):
"""
Converts two-digit years to year within [-50, 49]
range of self._year (current local time)
"""
# Function contract is that the year is always positive
assert year >= 0
if year < 100 and not century_specified:
# assume current century to start
year += self._century
if year >= self._year + 50: # if too far in future
year -= 100
elif year < self._year - 50: # if too far in past
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' 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, *args, **kwargs):
super(self.__class__, self).__init__(*args, **kwargs)
self.century_specified = False
self.dstridx = None
self.mstridx = None
self.ystridx = None
@property
def has_year(self):
return self.ystridx is not None
@property
def has_month(self):
return self.mstridx is not None
@property
def has_day(self):
return self.dstridx is not None
def could_be_day(self, value):
if self.has_day:
return False
elif not self.has_month:
return 1 <= value <= 31
elif not self.has_year:
# Be permissive, assume leap year
month = self[self.mstridx]
return 1 <= value <= monthrange(2000, month)[1]
else:
month = self[self.mstridx]
year = self[self.ystridx]
return 1 <= value <= monthrange(year, month)[1]
def append(self, val, label=None):
if hasattr(val, '__len__'):
if val.isdigit() and len(val) > 2:
self.century_specified = True
if label not in [None, 'Y']: # pragma: no cover
raise ValueError(label)
label = 'Y'
elif val > 100:
self.century_specified = True
if label not in [None, 'Y']: # pragma: no cover
raise ValueError(label)
label = 'Y'
super(self.__class__, self).append(int(val))
if label == 'M':
if self.has_month:
raise ValueError('Month is already set')
self.mstridx = len(self) - 1
elif label == 'D':
if self.has_day:
raise ValueError('Day is already set')
self.dstridx = len(self) - 1
elif label == 'Y':
if self.has_year:
raise ValueError('Year is already set')
self.ystridx = len(self) - 1
def _resolve_from_stridxs(self, strids):
"""
Try to resolve the identities of year/month/day elements using
ystridx, mstridx, and dstridx, if enough of these are specified.
"""
if len(self) == 3 and len(strids) == 2:
# we can back out the remaining stridx value
missing = [x for x in range(3) if x not in strids.values()]
key = [x for x in ['y', 'm', 'd'] if x not in strids]
assert len(missing) == len(key) == 1
key = key[0]
val = missing[0]
strids[key] = val
assert len(self) == len(strids) # otherwise this should not be called
out = {key: self[strids[key]] for key in strids}
return (out.get('y'), out.get('m'), out.get('d'))
def resolve_ymd(self, yearfirst, dayfirst):
len_ymd = len(self)
year, month, day = (None, None, None)
strids = (('y', self.ystridx),
('m', self.mstridx),
('d', self.dstridx))
strids = {key: val for key, val in strids if val is not None}
if (len(self) == len(strids) > 0 or
(len(self) == 3 and len(strids) == 2)):
return self._resolve_from_stridxs(strids)
mstridx = self.mstridx
if len_ymd > 3:
raise ValueError("More than three YMD values")
elif len_ymd == 1 or (mstridx is not None and len_ymd == 2):
# One member, or two members with a month string
if mstridx is not None:
month = self[mstridx]
# since mstridx is 0 or 1, self[mstridx-1] always
# looks up the other element
other = self[mstridx - 1]
else:
other = self[0]
if len_ymd > 1 or mstridx is None:
if other > 31:
year = other
else:
day = other
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:
if self[1] > 31:
# Apr-2003-25
month, year, day = self
else:
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 precedence 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.ystridx == 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 seconds or a :class:`tzinfo` object.
.. doctest::
:options: +NORMALIZE_WHITESPACE
>>> from dateutil.parser import parse
>>> from dateutil.tz import gettz
>>> tzinfos = {"BRST": -7200, "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', -7200))
>>> 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 ParserError:
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 ParserError("Unknown string format: %s", timestr)
if len(res) == 0:
raise ParserError("String does not contain a date: %s", timestr)
try:
ret = self._build_naive(res, default)
except ValueError as e:
six.raise_from(ParserError(str(e) + ": %s", timestr), e)
if not ignoretz:
ret = self._build_tzaware(ret, res, tzinfos)
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","any_unused_tokens"]
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
skipped_idxs = []
# year/month/day list
ymd = _ymd()
len_l = len(l)
i = 0
try:
while i < len_l:
# Check if it's a number
value_repr = l[i]
try:
value = float(value_repr)
except ValueError:
value = None
if value is not None:
# Numeric token
i = self._parse_numeric_token(l, i, info, ymd, res, fuzzy)
# Check weekday
elif info.weekday(l[i]) is not None:
value = info.weekday(l[i])
res.weekday = value
# Check month name
elif info.month(l[i]) is not None:
value = info.month(l[i])
ymd.append(value, 'M')
if i + 1 < len_l:
if l[i + 1] in ('-', '/'):
# Jan-01[-99]
sep = l[i + 1]
ymd.append(l[i + 2])
if i + 3 < len_l and l[i + 3] == sep:
# Jan-01-99
ymd.append(l[i + 4])
i += 2
i += 2
elif (i + 4 < len_l and l[i + 1] == l[i + 3] == ' ' and
info.pertain(l[i + 2])):
# Jan of 01
# In this case, 01 is clearly year
if l[i + 4].isdigit():
# Convert it here to become unambiguous
value = int(l[i + 4])
year = str(info.convertyear(value))
ymd.append(year, 'Y')
else:
# Wrong guess
pass
# TODO: not hit in tests
i += 4
# Check am/pm
elif info.ampm(l[i]) is not None:
value = info.ampm(l[i])
val_is_ampm = self._ampm_valid(res.hour, res.ampm, fuzzy)
if val_is_ampm:
res.hour = self._adjust_ampm(res.hour, value)
res.ampm = value
elif fuzzy:
skipped_idxs.append(i)
# Check for a timezone name
elif self._could_be_tzname(res.hour, res.tzname, res.tzoffset, l[i]):
res.tzname = l[i]
res.tzoffset = info.tzoffset(res.tzname)
# 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 + 1 < len_l and l[i + 1] in ('+', '-'):
l[i + 1] = ('+', '-')[l[i + 1] == '+']
res.tzoffset = None
if info.utczone(res.tzname):
# With something like GMT+3, the timezone
# is *not* GMT.
res.tzname = None
# Check for a numbered timezone
elif res.hour is not None and l[i] in ('+', '-'):
signal = (-1, 1)[l[i] == '+']
len_li = len(l[i + 1])
# TODO: check that l[i + 1] is integer?
if len_li == 4:
# -0300
hour_offset = int(l[i + 1][:2])
min_offset = int(l[i + 1][2:])
elif i + 2 < len_l and l[i + 2] == ':':
# -03:00
hour_offset = int(l[i + 1])
min_offset = int(l[i + 3]) # TODO: Check that l[i+3] is minute-like?
i += 2
elif len_li <= 2:
# -[0]3
hour_offset = int(l[i + 1][:2])
min_offset = 0
else:
raise ValueError(timestr)
res.tzoffset = signal * (hour_offset * 3600 + min_offset * 60)
# Look for a timezone name between parenthesis
if (i + 5 < len_l and
info.jump(l[i + 2]) and l[i + 3] == '(' and
l[i + 5] == ')' and
3 <= len(l[i + 4]) and
self._could_be_tzname(res.hour, res.tzname,
None, l[i + 4])):
# -0300 (BRST)
res.tzname = l[i + 4]
i += 4
i += 1
# Check jumps
elif not (info.jump(l[i]) or fuzzy):
raise ValueError(timestr)
else:
skipped_idxs.append(i)
i += 1
# Process year/month/day
year, month, day = ymd.resolve_ymd(yearfirst, dayfirst)
res.century_specified = ymd.century_specified
res.year = year
res.month = month
res.day = day
except (IndexError, ValueError):
return None, None
if not info.validate(res):
return None, None
if fuzzy_with_tokens:
skipped_tokens = self._recombine_skipped(l, skipped_idxs)
return res, tuple(skipped_tokens)
else:
return res, None
def _parse_numeric_token(self, tokens, idx, info, ymd, res, fuzzy):
# Token is a number
value_repr = tokens[idx]
try:
value = self._to_decimal(value_repr)
except Exception as e:
six.raise_from(ValueError('Unknown numeric token'), e)
len_li = len(value_repr)
len_l = len(tokens)
if (len(ymd) == 3 and len_li in (2, 4) and
res.hour is None and
(idx + 1 >= len_l or
(tokens[idx + 1] != ':' and
info.hms(tokens[idx + 1]) is None))):
# 19990101T23[59]
s = tokens[idx]
res.hour = int(s[:2])
if len_li == 4:
res.minute = int(s[2:])
elif len_li == 6 or (len_li > 6 and tokens[idx].find('.') == 6):
# YYMMDD or HHMMSS[.ss]
s = tokens[idx]
if not ymd and '.' not in tokens[idx]:
ymd.append(s[:2])
ymd.append(s[2:4])
ymd.append(s[4:])
else:
# 19990101T235959[.59]
# TODO: Check if res attributes already set.
res.hour = int(s[:2])
res.minute = int(s[2:4])
res.second, res.microsecond = self._parsems(s[4:])
elif len_li in (8, 12, 14):
# YYYYMMDD
s = tokens[idx]
ymd.append(s[:4], 'Y')
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 self._find_hms_idx(idx, tokens, info, allow_jump=True) is not None:
# HH[ ]h or MM[ ]m or SS[.ss][ ]s
hms_idx = self._find_hms_idx(idx, tokens, info, allow_jump=True)
(idx, hms) = self._parse_hms(idx, tokens, info, hms_idx)
if hms is not None:
# TODO: checking that hour/minute/second are not
# already set?
self._assign_hms(res, value_repr, hms)
elif idx + 2 < len_l and tokens[idx + 1] == ':':
# HH:MM[:SS[.ss]]
res.hour = int(value)
value = self._to_decimal(tokens[idx + 2]) # TODO: try/except for this?
(res.minute, res.second) = self._parse_min_sec(value)
if idx + 4 < len_l and tokens[idx + 3] == ':':
res.second, res.microsecond = self._parsems(tokens[idx + 4])
idx += 2
idx += 2
elif idx + 1 < len_l and tokens[idx + 1] in ('-', '/', '.'):
sep = tokens[idx + 1]
ymd.append(value_repr)
if idx + 2 < len_l and not info.jump(tokens[idx + 2]):
if tokens[idx + 2].isdigit():
# 01-01[-01]
ymd.append(tokens[idx + 2])
else:
# 01-Jan[-01]
value = info.month(tokens[idx + 2])
if value is not None:
ymd.append(value, 'M')
else:
raise ValueError()
if idx + 3 < len_l and tokens[idx + 3] == sep:
# We have three members
value = info.month(tokens[idx + 4])
if value is not None:
ymd.append(value, 'M')
else:
ymd.append(tokens[idx + 4])
idx += 2
idx += 1
idx += 1
elif idx + 1 >= len_l or info.jump(tokens[idx + 1]):
if idx + 2 < len_l and info.ampm(tokens[idx + 2]) is not None:
# 12 am
hour = int(value)
res.hour = self._adjust_ampm(hour, info.ampm(tokens[idx + 2]))
idx += 1
else:
# Year, month or day
ymd.append(value)
idx += 1
elif info.ampm(tokens[idx + 1]) is not None and (0 <= value < 24):
# 12am
hour = int(value)
res.hour = self._adjust_ampm(hour, info.ampm(tokens[idx + 1]))
idx += 1
elif ymd.could_be_day(value):
ymd.append(value)
elif not fuzzy:
raise ValueError()
return idx
def _find_hms_idx(self, idx, tokens, info, allow_jump):
len_l = len(tokens)
if idx+1 < len_l and info.hms(tokens[idx+1]) is not None:
# There is an "h", "m", or "s" label following this token. We take
# assign the upcoming label to the current token.
# e.g. the "12" in 12h"
hms_idx = idx + 1
elif (allow_jump and idx+2 < len_l and tokens[idx+1] == ' ' and
info.hms(tokens[idx+2]) is not None):
# There is a space and then an "h", "m", or "s" label.
# e.g. the "12" in "12 h"
hms_idx = idx + 2
elif idx > 0 and info.hms(tokens[idx-1]) is not None:
# There is a "h", "m", or "s" preceding this token. Since neither
# of the previous cases was hit, there is no label following this
# token, so we use the previous label.
# e.g. the "04" in "12h04"
hms_idx = idx-1
elif (1 < idx == len_l-1 and tokens[idx-1] == ' ' and
info.hms(tokens[idx-2]) is not None):
# If we are looking at the final token, we allow for a
# backward-looking check to skip over a space.
# TODO: Are we sure this is the right condition here?
hms_idx = idx - 2
else:
hms_idx = None
return hms_idx
def _assign_hms(self, res, value_repr, hms):
# See GH issue #427, fixing float rounding
value = self._to_decimal(value_repr)
if hms == 0:
# Hour
res.hour = int(value)
if value % 1:
res.minute = int(60*(value % 1))
elif hms == 1:
(res.minute, res.second) = self._parse_min_sec(value)
elif hms == 2:
(res.second, res.microsecond) = self._parsems(value_repr)
def _could_be_tzname(self, hour, tzname, tzoffset, token):
return (hour is not None and
tzname is None and
tzoffset is None and
len(token) <= 5 and
(all(x in string.ascii_uppercase for x in token)
or token in self.info.UTCZONE))
def _ampm_valid(self, hour, ampm, fuzzy):
"""
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 ampm is not None:
val_is_ampm = False
# If AM/PM is found and hour is not, raise a ValueError
if hour is None:
if fuzzy:
val_is_ampm = False
else:
raise ValueError('No hour specified with AM or PM flag.')
elif not 0 <= 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.')
return val_is_ampm
def _adjust_ampm(self, hour, ampm):
if hour < 12 and ampm == 1:
hour += 12
elif hour == 12 and ampm == 0:
hour = 0
return hour
def _parse_min_sec(self, value):
# TODO: Every usage of this function sets res.second to the return
# value. Are there any cases where second will be returned as None and
# we *don't* want to set res.second = None?
minute = int(value)
second = None
sec_remainder = value % 1
if sec_remainder:
second = int(60 * sec_remainder)
return (minute, second)
def _parse_hms(self, idx, tokens, info, hms_idx):
# TODO: Is this going to admit a lot of false-positives for when we
# just happen to have digits and "h", "m" or "s" characters in non-date
# text? I guess hex hashes won't have that problem, but there's plenty
# of random junk out there.
if hms_idx is None:
hms = None
new_idx = idx
elif hms_idx > idx:
hms = info.hms(tokens[hms_idx])
new_idx = hms_idx
else:
# Looking backwards, increment one.
hms = info.hms(tokens[hms_idx]) + 1
new_idx = idx
return (new_idx, hms)
# ------------------------------------------------------------------
# Handling for individual tokens. These are kept as methods instead
# of functions for the sake of customizability via subclassing.
def _parsems(self, 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])
def _to_decimal(self, val):
try:
decimal_value = Decimal(val)
# See GH 662, edge case, infinite value should not be converted
# via `_to_decimal`
if not decimal_value.is_finite():
raise ValueError("Converted decimal value is infinite or NaN")
except Exception as e:
msg = "Could not convert %s to decimal" % val
six.raise_from(ValueError(msg), e)
else:
return decimal_value
# ------------------------------------------------------------------
# Post-Parsing construction of datetime output. These are kept as
# methods instead of functions for the sake of customizability via
# subclassing.
def _build_tzinfo(self, tzinfos, tzname, tzoffset):
if callable(tzinfos):
tzdata = tzinfos(tzname, tzoffset)
else:
tzdata = tzinfos.get(tzname)
# handle case where tzinfo is paased an options that returns None
# eg tzinfos = {'BRST' : None}
if isinstance(tzdata, datetime.tzinfo) or tzdata is None:
tzinfo = tzdata
elif isinstance(tzdata, text_type):
tzinfo = tz.tzstr(tzdata)
elif isinstance(tzdata, integer_types):
tzinfo = tz.tzoffset(tzname, tzdata)
else:
raise TypeError("Offset must be tzinfo subclass, tz string, "
"or int offset.")
return tzinfo
def _build_tzaware(self, naive, res, tzinfos):
if (callable(tzinfos) or (tzinfos and res.tzname in tzinfos)):
tzinfo = self._build_tzinfo(tzinfos, res.tzname, res.tzoffset)
aware = naive.replace(tzinfo=tzinfo)
aware = self._assign_tzname(aware, res.tzname)
elif res.tzname and res.tzname in time.tzname:
aware = naive.replace(tzinfo=tz.tzlocal())
# Handle ambiguous local datetime
aware = self._assign_tzname(aware, res.tzname)
# This is mostly relevant for winter GMT zones parsed in the UK
if (aware.tzname() != res.tzname and
res.tzname in self.info.UTCZONE):
aware = aware.replace(tzinfo=tz.UTC)
elif res.tzoffset == 0:
aware = naive.replace(tzinfo=tz.UTC)
elif res.tzoffset:
aware = naive.replace(tzinfo=tz.tzoffset(res.tzname, res.tzoffset))
elif not res.tzname and not res.tzoffset:
# i.e. no timezone information was found.
aware = naive
elif res.tzname:
# tz-like string was parsed but we don't know what to do
# with it
warnings.warn("tzname {tzname} identified but not understood. "
"Pass `tzinfos` argument in order to correctly "
"return a timezone-aware datetime. In a future "
"version, this will raise an "
"exception.".format(tzname=res.tzname),
category=UnknownTimezoneWarning)
aware = naive
return aware
def _build_naive(self, res, default):
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]
naive = default.replace(**repl)
if res.weekday is not None and not res.day:
naive = naive + relativedelta.relativedelta(weekday=res.weekday)
return naive
def _assign_tzname(self, dt, tzname):
if dt.tzname() != tzname:
new_dt = tz.enfold(dt, fold=1)
if new_dt.tzname() == tzname:
return new_dt
return dt
def _recombine_skipped(self, tokens, skipped_idxs):
"""
>>> tokens = ["foo", " ", "bar", " ", "19June2000", "baz"]
>>> skipped_idxs = [0, 1, 2, 5]
>>> _recombine_skipped(tokens, skipped_idxs)
["foo bar", "baz"]
"""
skipped_tokens = []
for i, idx in enumerate(sorted(skipped_idxs)):
if i > 0 and idx - 1 == skipped_idxs[i - 1]:
skipped_tokens[-1] = skipped_tokens[-1] + tokens[idx]
else:
skipped_tokens.append(tokens[idx])
return skipped_tokens
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 seconds or a :class:`tzinfo` object.
.. doctest::
:options: +NORMALIZE_WHITESPACE
>>> from dateutil.parser import parse
>>> from dateutil.tz import gettz
>>> tzinfos = {"BRST": -7200, "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', -7200))
>>> 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 ParserError:
Raised for invalid or unknown string formats, 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 = [x for x in re.split(r'([,:.]|[a-zA-Z]+|[0-9]+)',tzstr) if x]
used_idxs = list()
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])
for ii in range(j):
used_idxs.append(ii)
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] == '+']
used_idxs.append(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)
used_idxs.append(i)
i += 2
elif len_li <= 2:
# -[0]3
setattr(res, offattr,
int(l[i][:2]) * 3600 * signal)
else:
return None
used_idxs.append(i)
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])
used_idxs.append(i)
i += 2
if l[i] == '-':
value = int(l[i + 1]) * -1
used_idxs.append(i)
i += 1
else:
value = int(l[i])
used_idxs.append(i)
i += 2
if value:
x.week = value
x.weekday = (int(l[i]) - 1) % 7
else:
x.day = int(l[i])
used_idxs.append(i)
i += 2
x.time = int(l[i])
used_idxs.append(i)
i += 2
if i < len_l:
if l[i] in ('-', '+'):
signal = (-1, 1)[l[i] == "+"]
used_idxs.append(i)
i += 1
else:
signal = 1
used_idxs.append(i)
res.dstoffset = (res.stdoffset + int(l[i]) * signal)
# This was a made-up format that is not in normal use
warn(('Parsed time zone "%s"' % tzstr) +
'is in a non-standard dateutil-specific format, which ' +
'is now deprecated; support for parsing this format ' +
'will be removed in future versions. It is recommended ' +
'that you switch to a standard format like the GNU ' +
'TZ variable format.', tz.DeprecatedTzFormatWarning)
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)
used_idxs.append(i)
i += 1
x.jyday = int(l[i])
elif l[i] == 'M':
# month[-.]week[-.]weekday
used_idxs.append(i)
i += 1
x.month = int(l[i])
used_idxs.append(i)
i += 1
assert l[i] in ('-', '.')
used_idxs.append(i)
i += 1
x.week = int(l[i])
if x.week == 5:
x.week = -1
used_idxs.append(i)
i += 1
assert l[i] in ('-', '.')
used_idxs.append(i)
i += 1
x.weekday = (int(l[i]) - 1) % 7
else:
# year day (zero based)
x.yday = int(l[i]) + 1
used_idxs.append(i)
i += 1
if i < len_l and l[i] == '/':
used_idxs.append(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
used_idxs.append(i)
i += 2
if i + 1 < len_l and l[i + 1] == ':':
used_idxs.append(i)
i += 2
x.time += int(l[i])
elif len_li <= 2:
# -[0]3
x.time = (int(l[i][:2]) * 3600)
else:
return None
used_idxs.append(i)
i += 1
assert i == len_l or l[i] == ','
i += 1
assert i >= len_l
except (IndexError, ValueError, AssertionError):
return None
unused_idxs = set(range(len_l)).difference(used_idxs)
res.any_unused_tokens = not {l[n] for n in unused_idxs}.issubset({",",":"})
return res
DEFAULTTZPARSER = _tzparser()
def _parsetz(tzstr):
return DEFAULTTZPARSER.parse(tzstr)
class ParserError(ValueError):
"""Exception subclass used for any failure to parse a datetime string.
This is a subclass of :py:exc:`ValueError`, and should be raised any time
earlier versions of ``dateutil`` would have raised ``ValueError``.
.. versionadded:: 2.8.1
"""
def __str__(self):
try:
return self.args[0] % self.args[1:]
except (TypeError, IndexError):
return super(ParserError, self).__str__()
def __repr__(self):
args = ", ".join("'%s'" % arg for arg in self.args)
return "%s(%s)" % (self.__class__.__name__, args)
class UnknownTimezoneWarning(RuntimeWarning):
"""Raised when the parser finds a timezone it cannot parse into a tzinfo.
.. versionadded:: 2.7.0
"""
# vim:ts=4:sw=4:et