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763 lines
28 KiB
Cython
763 lines
28 KiB
Cython
"""Strptime-related classes and functions.
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"""
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import calendar
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import locale
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import re
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import time
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from cpython.datetime cimport (
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date,
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tzinfo,
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)
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from _thread import allocate_lock as _thread_allocate_lock
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import numpy as np
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import pytz
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from numpy cimport (
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int64_t,
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ndarray,
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)
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from pandas._libs.missing cimport checknull_with_nat_and_na
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from pandas._libs.tslibs.nattype cimport (
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NPY_NAT,
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c_nat_strings as nat_strings,
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)
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from pandas._libs.tslibs.np_datetime cimport (
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check_dts_bounds,
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dtstruct_to_dt64,
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npy_datetimestruct,
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)
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cdef dict _parse_code_table = {'y': 0,
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'Y': 1,
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'm': 2,
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'B': 3,
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'b': 4,
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'd': 5,
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'H': 6,
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'I': 7,
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'M': 8,
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'S': 9,
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'f': 10,
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'A': 11,
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'a': 12,
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'w': 13,
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'j': 14,
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'U': 15,
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'W': 16,
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'Z': 17,
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'p': 18, # an additional key, only with I
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'z': 19,
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'G': 20,
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'V': 21,
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'u': 22}
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def array_strptime(ndarray[object] values, object fmt, bint exact=True, errors='raise'):
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"""
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Calculates the datetime structs represented by the passed array of strings
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Parameters
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----------
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values : ndarray of string-like objects
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fmt : string-like regex
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exact : matches must be exact if True, search if False
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errors : string specifying error handling, {'raise', 'ignore', 'coerce'}
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"""
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cdef:
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Py_ssize_t i, n = len(values)
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npy_datetimestruct dts
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int64_t[:] iresult
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object[:] result_timezone
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int year, month, day, minute, hour, second, weekday, julian
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int week_of_year, week_of_year_start, parse_code, ordinal
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int iso_week, iso_year
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int64_t us, ns
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object val, group_key, ampm, found, timezone
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dict found_key
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bint is_raise = errors=='raise'
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bint is_ignore = errors=='ignore'
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bint is_coerce = errors=='coerce'
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assert is_raise or is_ignore or is_coerce
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if fmt is not None:
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if '%W' in fmt or '%U' in fmt:
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if '%Y' not in fmt and '%y' not in fmt:
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raise ValueError("Cannot use '%W' or '%U' without day and year")
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if '%A' not in fmt and '%a' not in fmt and '%w' not in fmt:
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raise ValueError("Cannot use '%W' or '%U' without day and year")
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elif '%Z' in fmt and '%z' in fmt:
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raise ValueError("Cannot parse both %Z and %z")
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global _TimeRE_cache, _regex_cache
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with _cache_lock:
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if _getlang() != _TimeRE_cache.locale_time.lang:
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_TimeRE_cache = TimeRE()
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_regex_cache.clear()
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if len(_regex_cache) > _CACHE_MAX_SIZE:
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_regex_cache.clear()
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locale_time = _TimeRE_cache.locale_time
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format_regex = _regex_cache.get(fmt)
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if not format_regex:
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try:
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format_regex = _TimeRE_cache.compile(fmt)
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# KeyError raised when a bad format is found; can be specified as
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# \\, in which case it was a stray % but with a space after it
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except KeyError, err:
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bad_directive = err.args[0]
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if bad_directive == "\\":
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bad_directive = "%"
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del err
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raise ValueError(f"'{bad_directive}' is a bad directive "
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f"in format '{fmt}'")
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# IndexError only occurs when the format string is "%"
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except IndexError:
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raise ValueError(f"stray % in format '{fmt}'")
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_regex_cache[fmt] = format_regex
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result = np.empty(n, dtype='M8[ns]')
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iresult = result.view('i8')
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result_timezone = np.empty(n, dtype='object')
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dts.us = dts.ps = dts.as = 0
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for i in range(n):
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val = values[i]
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if isinstance(val, str):
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if val in nat_strings:
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iresult[i] = NPY_NAT
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continue
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else:
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if checknull_with_nat_and_na(val):
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iresult[i] = NPY_NAT
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continue
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else:
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val = str(val)
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# exact matching
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if exact:
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found = format_regex.match(val)
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if not found:
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if is_coerce:
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iresult[i] = NPY_NAT
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continue
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raise ValueError(f"time data '{val}' does not match "
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f"format '{fmt}' (match)")
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if len(val) != found.end():
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if is_coerce:
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iresult[i] = NPY_NAT
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continue
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raise ValueError(f"unconverted data remains: {val[found.end():]}")
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# search
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else:
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found = format_regex.search(val)
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if not found:
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if is_coerce:
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iresult[i] = NPY_NAT
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continue
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raise ValueError(f"time data {repr(val)} does not match format "
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f"{repr(fmt)} (search)")
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iso_year = -1
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year = 1900
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month = day = 1
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hour = minute = second = ns = us = 0
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timezone = None
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# Default to -1 to signify that values not known; not critical to have,
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# though
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iso_week = week_of_year = -1
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week_of_year_start = -1
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# weekday and julian defaulted to -1 so as to signal need to calculate
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# values
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weekday = julian = -1
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found_dict = found.groupdict()
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for group_key in found_dict.iterkeys():
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# Directives not explicitly handled below:
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# c, x, X
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# handled by making out of other directives
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# U, W
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# worthless without day of the week
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parse_code = _parse_code_table[group_key]
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if parse_code == 0:
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year = int(found_dict['y'])
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# Open Group specification for strptime() states that a %y
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# value in the range of [00, 68] is in the century 2000, while
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# [69,99] is in the century 1900
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if year <= 68:
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year += 2000
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else:
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year += 1900
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elif parse_code == 1:
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year = int(found_dict['Y'])
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elif parse_code == 2:
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month = int(found_dict['m'])
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# elif group_key == 'B':
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elif parse_code == 3:
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month = locale_time.f_month.index(found_dict['B'].lower())
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# elif group_key == 'b':
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elif parse_code == 4:
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month = locale_time.a_month.index(found_dict['b'].lower())
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# elif group_key == 'd':
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elif parse_code == 5:
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day = int(found_dict['d'])
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# elif group_key == 'H':
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elif parse_code == 6:
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hour = int(found_dict['H'])
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elif parse_code == 7:
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hour = int(found_dict['I'])
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ampm = found_dict.get('p', '').lower()
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# If there was no AM/PM indicator, we'll treat this like AM
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if ampm in ('', locale_time.am_pm[0]):
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# We're in AM so the hour is correct unless we're
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# looking at 12 midnight.
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# 12 midnight == 12 AM == hour 0
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if hour == 12:
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hour = 0
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elif ampm == locale_time.am_pm[1]:
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# We're in PM so we need to add 12 to the hour unless
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# we're looking at 12 noon.
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# 12 noon == 12 PM == hour 12
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if hour != 12:
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hour += 12
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elif parse_code == 8:
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minute = int(found_dict['M'])
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elif parse_code == 9:
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second = int(found_dict['S'])
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elif parse_code == 10:
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s = found_dict['f']
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# Pad to always return nanoseconds
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s += "0" * (9 - len(s))
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us = long(s)
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ns = us % 1000
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us = us // 1000
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elif parse_code == 11:
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weekday = locale_time.f_weekday.index(found_dict['A'].lower())
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elif parse_code == 12:
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weekday = locale_time.a_weekday.index(found_dict['a'].lower())
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elif parse_code == 13:
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weekday = int(found_dict['w'])
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if weekday == 0:
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weekday = 6
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else:
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weekday -= 1
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elif parse_code == 14:
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julian = int(found_dict['j'])
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elif parse_code == 15 or parse_code == 16:
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week_of_year = int(found_dict[group_key])
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if group_key == 'U':
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# U starts week on Sunday.
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week_of_year_start = 6
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else:
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# W starts week on Monday.
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week_of_year_start = 0
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elif parse_code == 17:
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timezone = pytz.timezone(found_dict['Z'])
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elif parse_code == 19:
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timezone = parse_timezone_directive(found_dict['z'])
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elif parse_code == 20:
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iso_year = int(found_dict['G'])
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elif parse_code == 21:
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iso_week = int(found_dict['V'])
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elif parse_code == 22:
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weekday = int(found_dict['u'])
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weekday -= 1
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# don't assume default values for ISO week/year
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if iso_year != -1:
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if iso_week == -1 or weekday == -1:
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raise ValueError("ISO year directive '%G' must be used with "
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"the ISO week directive '%V' and a weekday "
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"directive '%A', '%a', '%w', or '%u'.")
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if julian != -1:
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raise ValueError("Day of the year directive '%j' is not "
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"compatible with ISO year directive '%G'. "
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"Use '%Y' instead.")
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elif year != -1 and week_of_year == -1 and iso_week != -1:
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if weekday == -1:
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raise ValueError("ISO week directive '%V' must be used with "
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"the ISO year directive '%G' and a weekday "
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"directive '%A', '%a', '%w', or '%u'.")
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else:
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raise ValueError("ISO week directive '%V' is incompatible with "
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"the year directive '%Y'. Use the ISO year "
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"'%G' instead.")
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# If we know the wk of the year and what day of that wk, we can figure
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# out the Julian day of the year.
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if julian == -1 and weekday != -1:
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if week_of_year != -1:
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week_starts_Mon = week_of_year_start == 0
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julian = _calc_julian_from_U_or_W(year, week_of_year, weekday,
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week_starts_Mon)
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elif iso_year != -1 and iso_week != -1:
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year, julian = _calc_julian_from_V(iso_year, iso_week,
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weekday + 1)
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# Cannot pre-calculate date() since can change in Julian
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# calculation and thus could have different value for the day of the wk
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# calculation.
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try:
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if julian == -1:
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# Need to add 1 to result since first day of the year is 1, not
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# 0.
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ordinal = date(year, month, day).toordinal()
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julian = ordinal - date(year, 1, 1).toordinal() + 1
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else:
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# Assume that if they bothered to include Julian day it will
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# be accurate.
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datetime_result = date.fromordinal(
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(julian - 1) + date(year, 1, 1).toordinal())
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year = datetime_result.year
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month = datetime_result.month
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day = datetime_result.day
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except ValueError:
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if is_coerce:
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iresult[i] = NPY_NAT
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continue
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raise
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if weekday == -1:
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weekday = date(year, month, day).weekday()
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dts.year = year
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dts.month = month
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dts.day = day
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dts.hour = hour
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dts.min = minute
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dts.sec = second
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dts.us = us
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dts.ps = ns * 1000
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iresult[i] = dtstruct_to_dt64(&dts)
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try:
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check_dts_bounds(&dts)
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except ValueError:
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if is_coerce:
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iresult[i] = NPY_NAT
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continue
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raise
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result_timezone[i] = timezone
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return result, result_timezone.base
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"""
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_getlang, LocaleTime, TimeRE, _calc_julian_from_U_or_W are vendored
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from the standard library, see
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https://github.com/python/cpython/blob/master/Lib/_strptime.py
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The original module-level docstring follows.
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Strptime-related classes and functions.
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CLASSES:
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LocaleTime -- Discovers and stores locale-specific time information
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TimeRE -- Creates regexes for pattern matching a string of text containing
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time information
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FUNCTIONS:
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_getlang -- Figure out what language is being used for the locale
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strptime -- Calculates the time struct represented by the passed-in string
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"""
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def _getlang():
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"""Figure out what language is being used for the locale"""
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return locale.getlocale(locale.LC_TIME)
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class LocaleTime:
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"""
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Stores and handles locale-specific information related to time.
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ATTRIBUTES:
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f_weekday -- full weekday names (7-item list)
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a_weekday -- abbreviated weekday names (7-item list)
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f_month -- full month names (13-item list; dummy value in [0], which
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is added by code)
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a_month -- abbreviated month names (13-item list, dummy value in
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[0], which is added by code)
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am_pm -- AM/PM representation (2-item list)
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LC_date_time -- format string for date/time representation (string)
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LC_date -- format string for date representation (string)
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LC_time -- format string for time representation (string)
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timezone -- daylight- and non-daylight-savings timezone representation
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(2-item list of sets)
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lang -- Language used by instance (2-item tuple)
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"""
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def __init__(self):
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"""
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Set all attributes.
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Order of methods called matters for dependency reasons.
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The locale language is set at the offset and then checked again before
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exiting. This is to make sure that the attributes were not set with a
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mix of information from more than one locale. This would most likely
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happen when using threads where one thread calls a locale-dependent
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function while another thread changes the locale while the function in
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the other thread is still running. Proper coding would call for
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locks to prevent changing the locale while locale-dependent code is
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running. The check here is done in case someone does not think about
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doing this.
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Only other possible issue is if someone changed the timezone and did
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not call tz.tzset . That is an issue for the programmer, though,
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since changing the timezone is worthless without that call.
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"""
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self.lang = _getlang()
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self.__calc_weekday()
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self.__calc_month()
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self.__calc_am_pm()
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self.__calc_timezone()
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self.__calc_date_time()
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if _getlang() != self.lang:
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raise ValueError("locale changed during initialization")
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def __pad(self, seq, front):
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# Add '' to seq to either the front (is True), else the back.
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seq = list(seq)
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if front:
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seq.insert(0, '')
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else:
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seq.append('')
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return seq
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def __calc_weekday(self):
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# Set self.a_weekday and self.f_weekday using the calendar
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# module.
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a_weekday = [calendar.day_abbr[i].lower() for i in range(7)]
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f_weekday = [calendar.day_name[i].lower() for i in range(7)]
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self.a_weekday = a_weekday
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self.f_weekday = f_weekday
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def __calc_month(self):
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# Set self.f_month and self.a_month using the calendar module.
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a_month = [calendar.month_abbr[i].lower() for i in range(13)]
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f_month = [calendar.month_name[i].lower() for i in range(13)]
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self.a_month = a_month
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self.f_month = f_month
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def __calc_am_pm(self):
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# Set self.am_pm by using time.strftime().
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# The magic date (1999,3,17,hour,44,55,2,76,0) is not really that
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# magical; just happened to have used it everywhere else where a
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# static date was needed.
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am_pm = []
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for hour in (01, 22):
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time_tuple = time.struct_time(
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(1999, 3, 17, hour, 44, 55, 2, 76, 0))
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am_pm.append(time.strftime("%p", time_tuple).lower())
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self.am_pm = am_pm
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def __calc_date_time(self):
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# Set self.date_time, self.date, & self.time by using
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# time.strftime().
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# Use (1999,3,17,22,44,55,2,76,0) for magic date because the amount of
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# overloaded numbers is minimized. The order in which searches for
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# values within the format string is very important; it eliminates
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# possible ambiguity for what something represents.
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time_tuple = time.struct_time((1999, 3, 17, 22, 44, 55, 2, 76, 0))
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date_time = [None, None, None]
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date_time[0] = time.strftime("%c", time_tuple).lower()
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date_time[1] = time.strftime("%x", time_tuple).lower()
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date_time[2] = time.strftime("%X", time_tuple).lower()
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replacement_pairs = [('%', '%%'), (self.f_weekday[2], '%A'),
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(self.f_month[3], '%B'),
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(self.a_weekday[2], '%a'),
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(self.a_month[3], '%b'), (self.am_pm[1], '%p'),
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('1999', '%Y'), ('99', '%y'), ('22', '%H'),
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('44', '%M'), ('55', '%S'), ('76', '%j'),
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('17', '%d'), ('03', '%m'), ('3', '%m'),
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# '3' needed for when no leading zero.
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('2', '%w'), ('10', '%I')]
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replacement_pairs.extend([(tz, "%Z") for tz_values in self.timezone
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for tz in tz_values])
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for offset, directive in ((0, '%c'), (1, '%x'), (2, '%X')):
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current_format = date_time[offset]
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for old, new in replacement_pairs:
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# Must deal with possible lack of locale info
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# manifesting itself as the empty string (e.g., Swedish's
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# lack of AM/PM info) or a platform returning a tuple of empty
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# strings (e.g., MacOS 9 having timezone as ('','')).
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if old:
|
|
current_format = current_format.replace(old, new)
|
|
# If %W is used, then Sunday, 2005-01-03 will fall on week 0 since
|
|
# 2005-01-03 occurs before the first Monday of the year. Otherwise
|
|
# %U is used.
|
|
time_tuple = time.struct_time((1999, 1, 3, 1, 1, 1, 6, 3, 0))
|
|
if '00' in time.strftime(directive, time_tuple):
|
|
U_W = '%W'
|
|
else:
|
|
U_W = '%U'
|
|
date_time[offset] = current_format.replace('11', U_W)
|
|
self.LC_date_time = date_time[0]
|
|
self.LC_date = date_time[1]
|
|
self.LC_time = date_time[2]
|
|
|
|
def __calc_timezone(self):
|
|
# Set self.timezone by using time.tzname.
|
|
# Do not worry about possibility of time.tzname[0] == timetzname[1]
|
|
# and time.daylight; handle that in strptime .
|
|
try:
|
|
time.tzset()
|
|
except AttributeError:
|
|
pass
|
|
no_saving = frozenset(["utc", "gmt", time.tzname[0].lower()])
|
|
if time.daylight:
|
|
has_saving = frozenset([time.tzname[1].lower()])
|
|
else:
|
|
has_saving = frozenset()
|
|
self.timezone = (no_saving, has_saving)
|
|
|
|
|
|
class TimeRE(dict):
|
|
"""
|
|
Handle conversion from format directives to regexes.
|
|
|
|
Creates regexes for pattern matching a string of text containing
|
|
time information
|
|
"""
|
|
|
|
def __init__(self, locale_time=None):
|
|
"""
|
|
Create keys/values.
|
|
|
|
Order of execution is important for dependency reasons.
|
|
"""
|
|
if locale_time:
|
|
self.locale_time = locale_time
|
|
else:
|
|
self.locale_time = LocaleTime()
|
|
self._Z = None
|
|
base = super()
|
|
base.__init__({
|
|
# The " \d" part of the regex is to make %c from ANSI C work
|
|
'd': r"(?P<d>3[0-1]|[1-2]\d|0[1-9]|[1-9]| [1-9])",
|
|
'f': r"(?P<f>[0-9]{1,9})",
|
|
'G': r"(?P<G>\d\d\d\d)",
|
|
'H': r"(?P<H>2[0-3]|[0-1]\d|\d)",
|
|
'I': r"(?P<I>1[0-2]|0[1-9]|[1-9])",
|
|
'j': (r"(?P<j>36[0-6]|3[0-5]\d|[1-2]\d\d|0[1-9]\d|00[1-9]|"
|
|
r"[1-9]\d|0[1-9]|[1-9])"),
|
|
'm': r"(?P<m>1[0-2]|0[1-9]|[1-9])",
|
|
'M': r"(?P<M>[0-5]\d|\d)",
|
|
'S': r"(?P<S>6[0-1]|[0-5]\d|\d)",
|
|
'u': r"(?P<u>[1-7])",
|
|
'U': r"(?P<U>5[0-3]|[0-4]\d|\d)",
|
|
'V': r"(?P<V>5[0-3]|0[1-9]|[1-4]\d|\d)",
|
|
'w': r"(?P<w>[0-6])",
|
|
# W is set below by using 'U'
|
|
'y': r"(?P<y>\d\d)",
|
|
# TODO: Does 'Y' need to worry about having less or more than
|
|
# 4 digits?
|
|
'Y': r"(?P<Y>\d\d\d\d)",
|
|
'z': r"(?P<z>[+-]\d\d:?[0-5]\d(:?[0-5]\d(\.\d{1,6})?)?|Z)",
|
|
'A': self.__seqToRE(self.locale_time.f_weekday, 'A'),
|
|
'a': self.__seqToRE(self.locale_time.a_weekday, 'a'),
|
|
'B': self.__seqToRE(self.locale_time.f_month[1:], 'B'),
|
|
'b': self.__seqToRE(self.locale_time.a_month[1:], 'b'),
|
|
'p': self.__seqToRE(self.locale_time.am_pm, 'p'),
|
|
# 'Z' key is generated lazily via __getitem__
|
|
'%': '%'})
|
|
base.__setitem__('W', base.__getitem__('U').replace('U', 'W'))
|
|
base.__setitem__('c', self.pattern(self.locale_time.LC_date_time))
|
|
base.__setitem__('x', self.pattern(self.locale_time.LC_date))
|
|
base.__setitem__('X', self.pattern(self.locale_time.LC_time))
|
|
|
|
def __getitem__(self, key):
|
|
if key == "Z":
|
|
# lazy computation
|
|
if self._Z is None:
|
|
self._Z = self.__seqToRE(pytz.all_timezones, 'Z')
|
|
return self._Z
|
|
return super().__getitem__(key)
|
|
|
|
def __seqToRE(self, to_convert, directive):
|
|
"""
|
|
Convert a list to a regex string for matching a directive.
|
|
|
|
Want possible matching values to be from longest to shortest. This
|
|
prevents the possibility of a match occurring for a value that also
|
|
a substring of a larger value that should have matched (e.g., 'abc'
|
|
matching when 'abcdef' should have been the match).
|
|
"""
|
|
to_convert = sorted(to_convert, key=len, reverse=True)
|
|
for value in to_convert:
|
|
if value != '':
|
|
break
|
|
else:
|
|
return ''
|
|
regex = '|'.join(re.escape(stuff) for stuff in to_convert)
|
|
regex = f"(?P<{directive}>{regex})"
|
|
return regex
|
|
|
|
def pattern(self, format):
|
|
"""
|
|
Return regex pattern for the format string.
|
|
|
|
Need to make sure that any characters that might be interpreted as
|
|
regex syntax are escaped.
|
|
"""
|
|
processed_format = ''
|
|
# The sub() call escapes all characters that might be misconstrued
|
|
# as regex syntax. Cannot use re.escape since we have to deal with
|
|
# format directives (%m, etc.).
|
|
regex_chars = re.compile(r"([\\.^$*+?\(\){}\[\]|])")
|
|
format = regex_chars.sub(r"\\\1", format)
|
|
whitespace_replacement = re.compile(r'\s+')
|
|
format = whitespace_replacement.sub(r'\\s+', format)
|
|
while '%' in format:
|
|
directive_index = format.index('%') +1
|
|
processed_format = (f"{processed_format}"
|
|
f"{format[:directive_index -1]}"
|
|
f"{self[format[directive_index]]}")
|
|
format = format[directive_index +1:]
|
|
return f"{processed_format}{format}"
|
|
|
|
def compile(self, format):
|
|
"""Return a compiled re object for the format string."""
|
|
return re.compile(self.pattern(format), re.IGNORECASE)
|
|
|
|
|
|
_cache_lock = _thread_allocate_lock()
|
|
# DO NOT modify _TimeRE_cache or _regex_cache without acquiring the cache lock
|
|
# first!
|
|
_TimeRE_cache = TimeRE()
|
|
_CACHE_MAX_SIZE = 5 # Max number of regexes stored in _regex_cache
|
|
_regex_cache = {}
|
|
|
|
|
|
cdef int _calc_julian_from_U_or_W(int year, int week_of_year,
|
|
int day_of_week, int week_starts_Mon):
|
|
"""
|
|
Calculate the Julian day based on the year, week of the year, and day of
|
|
the week, with week_start_day representing whether the week of the year
|
|
assumes the week starts on Sunday or Monday (6 or 0).
|
|
|
|
Parameters
|
|
----------
|
|
year : int
|
|
the year
|
|
week_of_year : int
|
|
week taken from format U or W
|
|
week_starts_Mon : int
|
|
represents whether the week of the year
|
|
assumes the week starts on Sunday or Monday (6 or 0)
|
|
|
|
Returns
|
|
-------
|
|
int
|
|
converted julian day
|
|
"""
|
|
|
|
cdef:
|
|
int first_weekday, week_0_length, days_to_week
|
|
|
|
first_weekday = date(year, 1, 1).weekday()
|
|
# If we are dealing with the %U directive (week starts on Sunday), it's
|
|
# easier to just shift the view to Sunday being the first day of the
|
|
# week.
|
|
if not week_starts_Mon:
|
|
first_weekday = (first_weekday + 1) % 7
|
|
day_of_week = (day_of_week + 1) % 7
|
|
|
|
# Need to watch out for a week 0 (when the first day of the year is not
|
|
# the same as that specified by %U or %W).
|
|
week_0_length = (7 - first_weekday) % 7
|
|
if week_of_year == 0:
|
|
return 1 + day_of_week - first_weekday
|
|
else:
|
|
days_to_week = week_0_length + (7 * (week_of_year - 1))
|
|
return 1 + days_to_week + day_of_week
|
|
|
|
|
|
cdef (int, int) _calc_julian_from_V(int iso_year, int iso_week, int iso_weekday):
|
|
"""
|
|
Calculate the Julian day based on the ISO 8601 year, week, and weekday.
|
|
|
|
ISO weeks start on Mondays, with week 01 being the week containing 4 Jan.
|
|
ISO week days range from 1 (Monday) to 7 (Sunday).
|
|
|
|
Parameters
|
|
----------
|
|
iso_year : int
|
|
the year taken from format %G
|
|
iso_week : int
|
|
the week taken from format %V
|
|
iso_weekday : int
|
|
weekday taken from format %u
|
|
|
|
Returns
|
|
-------
|
|
(int, int)
|
|
the iso year and the Gregorian ordinal date / julian date
|
|
"""
|
|
|
|
cdef:
|
|
int correction, ordinal
|
|
|
|
correction = date(iso_year, 1, 4).isoweekday() + 3
|
|
ordinal = (iso_week * 7) + iso_weekday - correction
|
|
# ordinal may be negative or 0 now, which means the date is in the previous
|
|
# calendar year
|
|
if ordinal < 1:
|
|
ordinal += date(iso_year, 1, 1).toordinal()
|
|
iso_year -= 1
|
|
ordinal -= date(iso_year, 1, 1).toordinal()
|
|
return iso_year, ordinal
|
|
|
|
|
|
cdef tzinfo parse_timezone_directive(str z):
|
|
"""
|
|
Parse the '%z' directive and return a pytz.FixedOffset
|
|
|
|
Parameters
|
|
----------
|
|
z : string of the UTC offset
|
|
|
|
Returns
|
|
-------
|
|
pytz.FixedOffset
|
|
|
|
Notes
|
|
-----
|
|
This is essentially similar to the cpython implementation
|
|
https://github.com/python/cpython/blob/master/Lib/_strptime.py#L457-L479
|
|
"""
|
|
|
|
cdef:
|
|
int gmtoff_fraction, hours, minutes, seconds, pad_number, microseconds
|
|
int total_minutes
|
|
object gmtoff_remainder, gmtoff_remainder_padding
|
|
|
|
if z == 'Z':
|
|
return pytz.FixedOffset(0)
|
|
if z[3] == ':':
|
|
z = z[:3] + z[4:]
|
|
if len(z) > 5:
|
|
if z[5] != ':':
|
|
raise ValueError(f"Inconsistent use of : in {z}")
|
|
z = z[:5] + z[6:]
|
|
hours = int(z[1:3])
|
|
minutes = int(z[3:5])
|
|
seconds = int(z[5:7] or 0)
|
|
|
|
# Pad to always return microseconds.
|
|
gmtoff_remainder = z[8:]
|
|
pad_number = 6 - len(gmtoff_remainder)
|
|
gmtoff_remainder_padding = "0" * pad_number
|
|
microseconds = int(gmtoff_remainder + gmtoff_remainder_padding)
|
|
|
|
total_minutes = ((hours * 60) + minutes + (seconds // 60) +
|
|
(microseconds // 60_000_000))
|
|
total_minutes = -total_minutes if z.startswith("-") else total_minutes
|
|
return pytz.FixedOffset(total_minutes)
|