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145 lines
4.5 KiB
145 lines
4.5 KiB
import re
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import typing
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from datetime import timedelta
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from decimal import Decimal, InvalidOperation
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import babelfish
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from knowit.core import Configurable, Property
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from knowit.utils import round_decimal
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T = typing.TypeVar('T')
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class Basic(Property[T]):
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"""Basic property to handle int, Decimal and other basic types."""
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def __init__(self, *args: str, data_type: typing.Type,
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processor: typing.Optional[typing.Callable[[T], T]] = None,
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allow_fallback: bool = False, **kwargs):
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"""Init method."""
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super().__init__(*args, **kwargs)
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self.data_type = data_type
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self.processor = processor or (lambda x: x)
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self.allow_fallback = allow_fallback
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def handle(self, value, context: typing.MutableMapping):
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"""Handle value."""
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if isinstance(value, self.data_type):
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return self.processor(value)
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try:
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return self.processor(self.data_type(value))
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except ValueError:
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if not self.allow_fallback:
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self.report(value, context)
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class Duration(Property[timedelta]):
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"""Duration property."""
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duration_re = re.compile(r'(?P<hours>\d{1,2}):'
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r'(?P<minutes>\d{1,2}):'
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r'(?P<seconds>\d{1,2})(?:\.'
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r'(?P<milliseconds>\d{3})'
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r'(?P<microseconds>\d{3})?\d*)?')
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def __init__(self, *args: str, resolution: typing.Union[int, Decimal] = 1, **kwargs):
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"""Initialize a Duration."""
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super().__init__(*args, **kwargs)
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self.resolution = resolution
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def handle(self, value, context: typing.MutableMapping):
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"""Return duration as timedelta."""
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if isinstance(value, timedelta):
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return value
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elif isinstance(value, int):
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return timedelta(milliseconds=int(value * self.resolution))
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try:
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return timedelta(
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milliseconds=int(Decimal(value) * self.resolution))
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except (ValueError, InvalidOperation):
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pass
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match = self.duration_re.match(value)
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if not match:
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self.report(value, context)
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return None
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params = {
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key: int(value)
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for key, value in match.groupdict().items()
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if value
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}
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return timedelta(**params)
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class Language(Property[babelfish.Language]):
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"""Language property."""
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def handle(self, value, context: typing.MutableMapping):
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"""Handle languages."""
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try:
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if len(value) == 3:
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return babelfish.Language.fromalpha3b(value)
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return babelfish.Language.fromietf(value)
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except (babelfish.Error, ValueError):
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pass
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try:
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return babelfish.Language.fromname(value)
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except babelfish.Error:
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pass
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self.report(value, context)
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return babelfish.Language('und')
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class Quantity(Property):
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"""Quantity is a property with unit."""
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def __init__(self, *args: str, unit, data_type=int, **kwargs):
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"""Init method."""
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super().__init__(*args, **kwargs)
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self.unit = unit
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self.data_type = data_type
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def handle(self, value, context):
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"""Handle value with unit."""
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if not isinstance(value, self.data_type):
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try:
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value = self.data_type(value)
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except ValueError:
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self.report(value, context)
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return
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if isinstance(value, Decimal):
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value = round_decimal(value, min_digits=1, max_digits=3)
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return value if context.get('no_units') else value * self.unit
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class YesNo(Configurable[str]):
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"""Yes or No handler."""
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yes_values = ('yes', 'true', '1')
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def __init__(self, *args: str, yes=True, no=False, hide_value=None,
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config: typing.Optional[
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typing.Mapping[str, typing.Mapping]] = None,
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config_key: typing.Optional[str] = None,
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**kwargs):
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"""Init method."""
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super().__init__(config or {}, config_key=config_key, *args, **kwargs)
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self.yes = yes
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self.no = no
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self.hide_value = hide_value
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def handle(self, value, context):
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"""Handle boolean values."""
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result = self.yes if str(value).lower() in self.yes_values else self.no
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if result == self.hide_value:
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return None
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return super().handle(result, context) if self.mapping else result
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