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from datetime import date, datetime, time, timedelta, timezone, tzinfo
import re
from typing import TYPE_CHECKING, Any, Optional, Union
if TYPE_CHECKING:
from re import Match
from pip._vendor.tomli._parser 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]+)?"
RE_HEX = re.compile(r"[0-9A-Fa-f](?:_?[0-9A-Fa-f])*")
RE_BIN = re.compile(r"[01](?:_?[01])*")
RE_OCT = re.compile(r"[0-7](?:_?[0-7])*")
RE_NUMBER = re.compile(
r"[+-]?(?:0|[1-9](?:_?[0-9])*)" # integer
+ r"(?:\.[0-9](?:_?[0-9])*)?" # optional fractional part
+ r"(?:[eE][+-]?[0-9](?:_?[0-9])*)?" # optional exponent part
)
RE_LOCALTIME = re.compile(_TIME_RE_STR)
RE_DATETIME = re.compile(
r"([0-9]{4})-(0[1-9]|1[0-2])-(0[1-9]|1[0-9]|2[0-9]|3[01])" # date, e.g. 1988-10-27
+ r"(?:"
+ r"[T ]"
+ _TIME_RE_STR
+ r"(?:(Z)|([+-])([01][0-9]|2[0-3]):([0-5][0-9]))?" # time offset
+ r")?"
)
def match_to_datetime(match: "Match") -> Union[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_dir_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[1:].ljust(6, "0")[:6]) if micros_str else 0
if offset_dir_str:
offset_dir = 1 if offset_dir_str == "+" else -1
tz: Optional[tzinfo] = timezone(
timedelta(
hours=offset_dir * int(offset_hour_str),
minutes=offset_dir * int(offset_minute_str),
)
)
elif zulu_time:
tz = timezone.utc
else: # local date-time
tz = None
return datetime(year, month, day, hour, minute, sec, micros, tzinfo=tz)
def match_to_localtime(match: "Match") -> time:
hour_str, minute_str, sec_str, micros_str = match.groups()
micros = int(micros_str[1:].ljust(6, "0")[:6]) if micros_str else 0
return time(int(hour_str), int(minute_str), int(sec_str), micros)
def match_to_number(match: "Match", parse_float: "ParseFloat") -> Any:
match_str = match.group()
if "." in match_str or "e" in match_str or "E" in match_str:
return parse_float(match_str)
return int(match_str)