31 lines
1.1 KiB
Python
31 lines
1.1 KiB
Python
from dataclasses import dataclass, asdict, astuple
|
|
from typing import TypeVar, Generic, Optional
|
|
|
|
# Some typing information for Python static type checkers
|
|
Literal = TypeVar('Literal', int, float, bool, str) # Must be int, float, bool or str
|
|
|
|
|
|
@dataclass
|
|
class Element(Generic[Literal]):
|
|
"""
|
|
An Element can represent one of following two things, based on the value of its attributes:
|
|
|
|
* An element (node or edge) in the State (id is not None). In this case the value can be None because it hasn't
|
|
yet been read OR because the element doesn't have a value.
|
|
* A value for which a node has not yet been materialized in the State (id is None, value is not None).
|
|
|
|
|
|
If you are familiar with the Modelverse Kernel, this class serves a function similar to the {id: ..., value: ...}
|
|
dict that is used there.
|
|
"""
|
|
id: Optional[str] = None
|
|
value: Optional[Literal] = None
|
|
|
|
def is_none(self) -> bool:
|
|
return self.id is None and self.value is None
|
|
|
|
|
|
String = Element[str]
|
|
Integer = Element[int]
|
|
Float = Element[float]
|
|
Boolean = Element[bool]
|