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"""Library for parsing and encoding UTC-OFFSET values."""
from __future__ import annotations
import datetime
import re
from dataclasses import dataclass
from typing import Any
from ical.parsing.property import ParsedProperty
from .data_types import DATA_TYPE
UTC_OFFSET_REGEX = re.compile(r"^([-+]?)([0-9]{2})([0-9]{2})$")
@DATA_TYPE.register("UTC-OFFSET")
@dataclass
class UtcOffset:
"""Contains an offset from UTC to local time."""
offset: datetime.timedelta
@classmethod
def __parse_property_value__(cls, prop: Any) -> UtcOffset:
"""Parse a UTC Offset."""
if isinstance(prop, UtcOffset):
return prop
value = prop
if isinstance(prop, ParsedProperty):
value = prop.value
if not (match := UTC_OFFSET_REGEX.fullmatch(value)):
raise ValueError(f"Expected value to match UTC-OFFSET pattern: {value}")
sign, hours, minutes = match.groups()
result = datetime.timedelta(
hours=int(hours or 0),
minutes=int(minutes or 0),
)
if sign == "-":
result = -result
return UtcOffset(result)
@classmethod
def __encode_property_json__(cls, value: UtcOffset) -> str:
"""Serialize a time delta as a UTC-OFFSET ICS value."""
duration = value.offset
parts = []
if duration < datetime.timedelta(days=0):
parts.append("-")
duration = -duration
seconds = duration.seconds
hours = int(seconds / 3600)
seconds %= 3600
parts.append(f"{hours:02}")
minutes = int(seconds / 60)
seconds %= 60
parts.append(f"{minutes:02}")
return "".join(parts)
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