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- from __future__ import annotations
- from datetime import date, datetime, time, timedelta, timezone, tzinfo
- from functools import lru_cache
- import re
- from typing import Any
- from tomli._types import ParseFloat
- # E.g.
- # - 00:32:00.999999
- # - 00:32:00
- _TIME_RE_STR = r"([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])(?:\.([0-9]{1,6})[0-9]*)?"
- RE_NUMBER = re.compile(
- r"""
- 0
- (?:
- x[0-9A-Fa-f](?:_?[0-9A-Fa-f])* # hex
- |
- b[01](?:_?[01])* # bin
- |
- o[0-7](?:_?[0-7])* # oct
- )
- |
- [+-]?(?:0|[1-9](?:_?[0-9])*) # dec, integer part
- (?P<floatpart>
- (?:\.[0-9](?:_?[0-9])*)? # optional fractional part
- (?:[eE][+-]?[0-9](?:_?[0-9])*)? # optional exponent part
- )
- """,
- flags=re.VERBOSE,
- )
- RE_LOCALTIME = re.compile(_TIME_RE_STR)
- RE_DATETIME = re.compile(
- fr"""
- ([0-9]{{4}})-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01]) # date, e.g. 1988-10-27
- (?:
- [Tt ]
- {_TIME_RE_STR}
- (?:([Zz])|([+-])([01][0-9]|2[0-3]):([0-5][0-9]))? # optional time offset
- )?
- """,
- flags=re.VERBOSE,
- )
- def match_to_datetime(match: re.Match) -> datetime | date:
- """Convert a `RE_DATETIME` match to `datetime.datetime` or `datetime.date`.
- Raises ValueError if the match does not correspond to a valid date
- or datetime.
- """
- (
- year_str,
- month_str,
- day_str,
- hour_str,
- minute_str,
- sec_str,
- micros_str,
- zulu_time,
- offset_sign_str,
- offset_hour_str,
- offset_minute_str,
- ) = match.groups()
- year, month, day = int(year_str), int(month_str), int(day_str)
- if hour_str is None:
- return date(year, month, day)
- hour, minute, sec = int(hour_str), int(minute_str), int(sec_str)
- micros = int(micros_str.ljust(6, "0")) if micros_str else 0
- if offset_sign_str:
- tz: tzinfo | None = cached_tz(
- offset_hour_str, offset_minute_str, offset_sign_str
- )
- elif zulu_time:
- tz = timezone.utc
- else: # local date-time
- tz = None
- return datetime(year, month, day, hour, minute, sec, micros, tzinfo=tz)
- @lru_cache(maxsize=None)
- def cached_tz(hour_str: str, minute_str: str, sign_str: str) -> timezone:
- sign = 1 if sign_str == "+" else -1
- return timezone(
- timedelta(
- hours=sign * int(hour_str),
- minutes=sign * int(minute_str),
- )
- )
- def match_to_localtime(match: re.Match) -> time:
- hour_str, minute_str, sec_str, micros_str = match.groups()
- micros = int(micros_str.ljust(6, "0")) if micros_str else 0
- return time(int(hour_str), int(minute_str), int(sec_str), micros)
- def match_to_number(match: re.Match, parse_float: ParseFloat) -> Any:
- if match.group("floatpart"):
- return parse_float(match.group())
- return int(match.group(), 0)
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