/
enum.py
35 lines (23 loc) · 1.05 KB
/
enum.py
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from typing import Type
from .base import BaseType, TypeMeta, TypeOptions
class EnumOptions(TypeOptions):
__slots__ = 'enum_values',
def __init__(self, **kwargs):
super().__init__(**kwargs)
assert self.abstract or self.enum_values, f'"{self.name}" is missing valid `Enum` values'
class EnumMeta(TypeMeta):
def __new__(mcs, *args, options_class: Type[EnumOptions] = EnumOptions, **kwargs):
return super().__new__(mcs, *args, options_class, **kwargs)
@classmethod
def get_option_attrs(mcs, name: str, base_attrs: dict, attrs: dict, meta_attrs: dict):
return {**super().get_option_attrs(name, base_attrs, attrs, meta_attrs), **{
'enum_values': {field_name: field for field_name, field in attrs.items() if isinstance(field, EnumValue)},
}}
class EnumValue:
__slots__ = 'value', 'description'
def __init__(self, value, description: str = None):
self.value = value
self.description = description
class Enum(BaseType, metaclass=EnumMeta):
class Meta:
abstract = True