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from __future__ import annotations
from dataclasses import dataclass
from typing import Protocol, Self
from automat import TypeMachineBuilder
@dataclass
class Core:
value: int
@dataclass
class DataObj:
datum: str
@classmethod
def create(cls, inputs: Inputs, core: Core, datum: str) -> Self:
return cls(datum)
# begin salient
class Inputs(Protocol):
def serialize(self) -> tuple[int, str | None]: ...
def next(self) -> None: ...
def data(self, datum: str) -> None: ...
builder = TypeMachineBuilder(Inputs, Core)
start = builder.state("start")
nodata = builder.state("nodata")
data = builder.state("data", DataObj.create)
nodata.upon(Inputs.data).to(data).returns(None)
start.upon(Inputs.next).to(nodata).returns(None)
@nodata.upon(Inputs.serialize).loop()
def serialize(inputs: Inputs, core: Core) -> tuple[int, None]:
return (core.value, None)
@data.upon(Inputs.serialize).loop()
def serializeData(inputs: Inputs, core: Core, data: DataObj) -> tuple[int, str]:
return (core.value, data.datum)
# end salient
# build and serialize
machineFactory = builder.build()
machine = machineFactory(Core(3))
machine.next()
print(machine.serialize())
machine.data("hi")
print(machine.serialize())
# end build
def deserializeWithoutData(serialization: tuple[int, DataObj | None]) -> Inputs:
coreValue, dataValue = serialization
assert dataValue is None, "not handling data yet"
return machineFactory(Core(coreValue), nodata)
print(deserializeWithoutData((3, None)))
def deserialize(serialization: tuple[int, str | None]) -> Inputs:
coreValue, dataValue = serialization
if dataValue is None:
return machineFactory(Core(coreValue), nodata)
else:
return machineFactory(
Core(coreValue),
data,
lambda inputs, core: DataObj(dataValue),
)
print(deserialize((3, None)).serialize())
print(deserialize((4, "hello")).serialize())
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