539 lines
19 KiB
Cython
539 lines
19 KiB
Cython
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"""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, str 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[::1] iresult
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object[::1] 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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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/main/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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from _strptime import (
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LocaleTime,
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|
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TimeRE as _TimeRE,
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_getlang,
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)
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class TimeRE(_TimeRE):
|
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"""
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Handle conversion from format directives to regexes.
|
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|
Creates regexes for pattern matching a string of text containing
|
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|
time information
|
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|
"""
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def __init__(self, locale_time=None):
|
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"""
|
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Create keys/values.
|
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|
Order of execution is important for dependency reasons.
|
||
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|
"""
|
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|
self._Z = None
|
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|
super().__init__(locale_time=locale_time)
|
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# GH 48767: Overrides for cpython's TimeRE
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# 1) Parse up to nanos instead of micros
|
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|
self.update({"f": r"(?P<f>[0-9]{1,9})"}),
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def __getitem__(self, key):
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if key == "Z":
|
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# lazy computation
|
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if self._Z is None:
|
||
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|
self._Z = self.__seqToRE(pytz.all_timezones, 'Z')
|
||
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|
# Note: handling Z is the key difference vs using the stdlib
|
||
|
|
# _strptime.TimeRE. test_to_datetime_parse_tzname_or_tzoffset with
|
||
|
|
# fmt='%Y-%m-%d %H:%M:%S %Z' fails with the stdlib version.
|
||
|
|
return self._Z
|
||
|
|
return super().__getitem__(key)
|
||
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||
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|
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|
_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 = {}
|
||
|
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|
||
|
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|
||
|
|
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)
|