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from typing import TypeVar, Generic
import copy
from .list import CruUniqueKeyList
from ._error import CruInternalError
from .value import (
CruValueTypeError,
ValueGeneratorBase,
ValueType,
)
_T = TypeVar("_T")
class ConfigItem(Generic[_T]):
def __init__(
self,
name: str,
description: str,
value_type: ValueType[_T],
value: _T | None,
default_value: _T,
*,
value_generator: ValueGeneratorBase | None = None,
) -> None:
self._name = name
self._description = description
self._value_type = value_type
self._default_value = default_value
self._value_generator = value_generator
self._value = value
@property
def name(self) -> str:
return self._name
@property
def description(self) -> str:
return self._description
@property
def value_type(self) -> ValueType[_T]:
return self._value_type
@property
def default_value(self) -> _T:
return self._default_value
@property
def is_default(self) -> bool:
return self._value is None
@property
def is_set(self) -> bool:
return not self.is_default
@property
def value(self) -> _T:
return self._value or self._default_value
@property
def value_generator(self) -> ValueGeneratorBase | None:
return self._value_generator
def set_value(self, v: _T | str, /, allow_convert_from_str=False):
if allow_convert_from_str:
self._value = self.value_type.check_value(v)
else:
self._value = self.value_type.check_value_or_try_convert_from_str(v)
def generate_value(self) -> _T | None:
if self.value_generator is None:
return None
v = self.generate_value()
try:
self.value_type.check_value(v)
return v
except CruValueTypeError as e:
raise CruInternalError(
"Config value generator returns invalid value."
) from e
def copy(self) -> "ConfigItem":
return ConfigItem(
self.name,
self.description,
self.value_type,
copy.deepcopy(self._value) if self._value is not None else None,
copy.deepcopy(self._default_value),
value_generator=self.value_generator,
)
class Configuration(CruUniqueKeyList[ConfigItem, str]):
def __init__(self):
super().__init__(lambda c: c.name)
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