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1# SPDX-License-Identifier: MIT
2# SPDX-FileCopyrightText: 2021 Taneli Hukkinen
3# Licensed to PSF under a Contributor Agreement.
4
5from __future__ import annotations
6
7from datetime import date, datetime, time, timedelta, timezone, tzinfo
8from functools import lru_cache
9import re
10from typing import Any
11
12from ._types import ParseFloat
13
14# E.g.
15# - 00:32:00.999999
16# - 00:32:00
17_TIME_RE_STR = r"([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])(?:\.([0-9]{1,6})[0-9]*)?"
18
19RE_NUMBER = re.compile(
20 r"""
210
22(?:
23 x[0-9A-Fa-f](?:_?[0-9A-Fa-f])* # hex
24 |
25 b[01](?:_?[01])* # bin
26 |
27 o[0-7](?:_?[0-7])* # oct
28)
29|
30[+-]?(?:0|[1-9](?:_?[0-9])*) # dec, integer part
31(?P<floatpart>
32 (?:\.[0-9](?:_?[0-9])*)? # optional fractional part
33 (?:[eE][+-]?[0-9](?:_?[0-9])*)? # optional exponent part
34)
35""",
36 flags=re.VERBOSE,
37)
38RE_LOCALTIME = re.compile(_TIME_RE_STR)
39RE_DATETIME = re.compile(
40 rf"""
41([0-9]{{4}})-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01]) # date, e.g. 1988-10-27
42(?:
43 [Tt ]
44 {_TIME_RE_STR}
45 (?:([Zz])|([+-])([01][0-9]|2[0-3]):([0-5][0-9]))? # optional time offset
46)?
47""",
48 flags=re.VERBOSE,
49)
50
51
52def match_to_datetime(match: re.Match) -> datetime | date:
53 """Convert a `RE_DATETIME` match to `datetime.datetime` or `datetime.date`.
54
55 Raises ValueError if the match does not correspond to a valid date
56 or datetime.
57 """
58 (
59 year_str,
60 month_str,
61 day_str,
62 hour_str,
63 minute_str,
64 sec_str,
65 micros_str,
66 zulu_time,
67 offset_sign_str,
68 offset_hour_str,
69 offset_minute_str,
70 ) = match.groups()
71 year, month, day = int(year_str), int(month_str), int(day_str)
72 if hour_str is None:
73 return date(year, month, day)
74 hour, minute, sec = int(hour_str), int(minute_str), int(sec_str)
75 micros = int(micros_str.ljust(6, "0")) if micros_str else 0
76 if offset_sign_str:
77 tz: tzinfo | None = cached_tz(
78 offset_hour_str, offset_minute_str, offset_sign_str
79 )
80 elif zulu_time:
81 tz = timezone.utc
82 else: # local date-time
83 tz = None
84 return datetime(year, month, day, hour, minute, sec, micros, tzinfo=tz)
85
86
87@lru_cache(maxsize=None)
88def cached_tz(hour_str: str, minute_str: str, sign_str: str) -> timezone:
89 sign = 1 if sign_str == "+" else -1
90 return timezone(
91 timedelta(
92 hours=sign * int(hour_str),
93 minutes=sign * int(minute_str),
94 )
95 )
96
97
98def match_to_localtime(match: re.Match) -> time:
99 hour_str, minute_str, sec_str, micros_str = match.groups()
100 micros = int(micros_str.ljust(6, "0")) if micros_str else 0
101 return time(int(hour_str), int(minute_str), int(sec_str), micros)
102
103
104def match_to_number(match: re.Match, parse_float: ParseFloat) -> Any:
105 if match.group("floatpart"):
106 return parse_float(match.group())
107 return int(match.group(), 0)