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113 lines
3.1 KiB
Python
113 lines
3.1 KiB
Python
# SPDX-License-Identifier: MIT
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# SPDX-FileCopyrightText: 2021 Taneli Hukkinen
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# Licensed to PSF under a Contributor Agreement.
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from __future__ import annotations
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from datetime import date, datetime, time, timedelta, timezone, tzinfo
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from functools import lru_cache
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import re
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TYPE_CHECKING = False
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if TYPE_CHECKING:
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from typing import Any
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from ._types import ParseFloat
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# E.g.
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# - 00:32:00.999999
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# - 00:32:00
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_TIME_RE_STR = r"([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])(?:\.([0-9]{1,6})[0-9]*)?"
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RE_NUMBER = re.compile(
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r"""
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0
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(?:
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x[0-9A-Fa-f](?:_?[0-9A-Fa-f])* # hex
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b[01](?:_?[01])* # bin
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o[0-7](?:_?[0-7])* # oct
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)
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[+-]?(?:0|[1-9](?:_?[0-9])*) # dec, integer part
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(?P<floatpart>
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(?:\.[0-9](?:_?[0-9])*)? # optional fractional part
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(?:[eE][+-]?[0-9](?:_?[0-9])*)? # optional exponent part
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)
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""",
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flags=re.VERBOSE,
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)
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RE_LOCALTIME = re.compile(_TIME_RE_STR)
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RE_DATETIME = re.compile(
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rf"""
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([0-9]{{4}})-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01]) # date, e.g. 1988-10-27
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(?:
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[Tt ]
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{_TIME_RE_STR}
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(?:([Zz])|([+-])([01][0-9]|2[0-3]):([0-5][0-9]))? # optional time offset
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)?
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""",
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flags=re.VERBOSE,
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)
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def match_to_datetime(match: re.Match[str]) -> datetime | date:
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"""Convert a `RE_DATETIME` match to `datetime.datetime` or `datetime.date`.
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Raises ValueError if the match does not correspond to a valid date
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or datetime.
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"""
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(
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year_str,
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month_str,
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day_str,
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hour_str,
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minute_str,
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sec_str,
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micros_str,
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zulu_time,
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offset_sign_str,
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offset_hour_str,
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offset_minute_str,
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) = match.groups()
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year, month, day = int(year_str), int(month_str), int(day_str)
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if hour_str is None:
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return date(year, month, day)
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hour, minute, sec = int(hour_str), int(minute_str), int(sec_str)
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micros = int(micros_str.ljust(6, "0")) if micros_str else 0
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if offset_sign_str:
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tz: tzinfo | None = cached_tz(
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offset_hour_str, offset_minute_str, offset_sign_str
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)
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elif zulu_time:
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tz = timezone.utc
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else: # local date-time
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tz = None
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return datetime(year, month, day, hour, minute, sec, micros, tzinfo=tz)
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# No need to limit cache size. This is only ever called on input
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# that matched RE_DATETIME, so there is an implicit bound of
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# 24 (hours) * 60 (minutes) * 2 (offset direction) = 2880.
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@lru_cache(maxsize=None)
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def cached_tz(hour_str: str, minute_str: str, sign_str: str) -> timezone:
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sign = 1 if sign_str == "+" else -1
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return timezone(
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timedelta(
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hours=sign * int(hour_str),
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minutes=sign * int(minute_str),
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)
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)
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def match_to_localtime(match: re.Match[str]) -> time:
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hour_str, minute_str, sec_str, micros_str = match.groups()
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micros = int(micros_str.ljust(6, "0")) if micros_str else 0
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return time(int(hour_str), int(minute_str), int(sec_str), micros)
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def match_to_number(match: re.Match[str], parse_float: ParseFloat) -> Any:
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if match.group("floatpart"):
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return parse_float(match.group())
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return int(match.group(), 0)
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