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from __future__ import annotations
import contextlib
import copy
import os
import re
import struct
from datetime import date
from datetime import datetime
from datetime import time
from typing import Any
from typing import Optional
from typing import cast
from dateutil import parser
from pendulum.parsing.exceptions import ParserError
with_extensions = os.getenv("PENDULUM_EXTENSIONS", "1") == "1"
try:
if not with_extensions or struct.calcsize("P") == 4:
raise ImportError()
from pendulum.parsing._iso8601 import Duration
from pendulum.parsing._iso8601 import parse_iso8601
except ImportError:
from pendulum.duration import Duration # type: ignore[misc]
from pendulum.parsing.iso8601 import parse_iso8601 # type: ignore[misc]
COMMON = re.compile(
# Date (optional) # noqa: E800
"^"
"(?P<date>"
" (?P<classic>" # Classic date (YYYY-MM-DD)
r" (?P<year>\d{4})" # Year
" (?P<monthday>"
r" (?P<monthsep>[/:])?(?P<month>\d{2})" # Month (optional)
r" ((?P<daysep>[/:])?(?P<day>\d{2}))" # Day (optional)
" )?"
" )"
")?"
# Time (optional) # noqa: E800
"(?P<time>"
r" (?P<timesep>\ )?" # Separator (space)
r" (?P<hour>\d{1,2}):(?P<minute>\d{1,2})?(?::(?P<second>\d{1,2}))?" # HH:mm:ss (optional mm and ss)
# Subsecond part (optional)
" (?P<subsecondsection>"
" (?:[.|,])" # Subsecond separator (optional)
r" (?P<subsecond>\d{1,9})" # Subsecond
" )?"
")?"
"$",
re.VERBOSE,
)
DEFAULT_OPTIONS = {
"day_first": False,
"year_first": True,
"strict": True,
"exact": False,
"now": None,
}
def parse(text: str, **options: Any) -> datetime | date | time | _Interval | Duration:
"""
Parses a string with the given options.
:param text: The string to parse.
"""
_options: dict[str, Any] = copy.copy(DEFAULT_OPTIONS)
_options.update(options)
return _normalize(_parse(text, **_options), **_options)
def _normalize(
parsed: datetime | date | time | _Interval | Duration, **options: Any
) -> datetime | date | time | _Interval | Duration:
"""
Normalizes the parsed element.
:param parsed: The parsed elements.
"""
if options.get("exact"):
return parsed
if isinstance(parsed, time):
now = cast(Optional[datetime], options["now"]) or datetime.now()
return datetime(
now.year,
now.month,
now.day,
parsed.hour,
parsed.minute,
parsed.second,
parsed.microsecond,
)
elif isinstance(parsed, date) and not isinstance(parsed, datetime):
return datetime(parsed.year, parsed.month, parsed.day)
return parsed
def _parse(text: str, **options: Any) -> datetime | date | time | _Interval | Duration:
# Trying to parse ISO8601
with contextlib.suppress(ValueError):
return parse_iso8601(text)
with contextlib.suppress(ValueError):
return _parse_iso8601_interval(text)
with contextlib.suppress(ParserError):
return _parse_common(text, **options)
# We couldn't parse the string
# so we fallback on the dateutil parser
# If not strict
if options.get("strict", True):
raise ParserError(f"Unable to parse string [{text}]")
try:
dt = parser.parse(
text, dayfirst=options["day_first"], yearfirst=options["year_first"]
)
except ValueError:
raise ParserError(f"Invalid date string: {text}")
return dt
def _parse_common(text: str, **options: Any) -> datetime | date | time:
"""
Tries to parse the string as a common datetime format.
:param text: The string to parse.
"""
m = COMMON.match(text)
has_date = False
year = 0
month = 1
day = 1
if not m:
raise ParserError("Invalid datetime string")
if m.group("date"):
# A date has been specified
has_date = True
year = int(m.group("year"))
if not m.group("monthday"):
# No month and day
month = 1
day = 1
else:
if options["day_first"]:
month = int(m.group("day"))
day = int(m.group("month"))
else:
month = int(m.group("month"))
day = int(m.group("day"))
if not m.group("time"):
return date(year, month, day)
# Grabbing hh:mm:ss
hour = int(m.group("hour"))
minute = int(m.group("minute"))
if m.group("second"):
second = int(m.group("second"))
else:
second = 0
# Grabbing subseconds, if any
microsecond = 0
if m.group("subsecondsection"):
# Limiting to 6 chars
subsecond = m.group("subsecond")[:6]
microsecond = int(f"{subsecond:0<6}")
if has_date:
return datetime(year, month, day, hour, minute, second, microsecond)
return time(hour, minute, second, microsecond)
class _Interval:
"""
Special class to handle ISO 8601 intervals
"""
def __init__(
self,
start: datetime | None = None,
end: datetime | None = None,
duration: Duration | None = None,
) -> None:
self.start = start
self.end = end
self.duration = duration
def _parse_iso8601_interval(text: str) -> _Interval:
if "/" not in text:
raise ParserError("Invalid interval")
first, last = text.split("/")
start = end = duration = None
if first[0] == "P":
# duration/end
duration = parse_iso8601(first)
end = parse_iso8601(last)
elif last[0] == "P":
# start/duration
start = parse_iso8601(first)
duration = parse_iso8601(last)
else:
# start/end
start = parse_iso8601(first)
end = parse_iso8601(last)
return _Interval(
cast(datetime, start), cast(datetime, end), cast(Duration, duration)
)
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