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from __future__ import annotations
from typing import Callable
from mypy.nodes import ARG_POS, Argument, Var
from mypy.plugin import ClassDefContext, Plugin
from mypy.plugins.common import MethodSpec, add_overloaded_method_to_class
class OverloadedMethodPlugin(Plugin):
def get_base_class_hook(self, fullname: str) -> Callable[[ClassDefContext], None] | None:
if "AddOverloadedMethod" in fullname:
return add_overloaded_method_hook
return None
def add_overloaded_method_hook(ctx: ClassDefContext) -> None:
add_overloaded_method_to_class(ctx.api, ctx.cls, "method", _generate_method_specs(ctx))
add_overloaded_method_to_class(
ctx.api, ctx.cls, "clsmethod", _generate_method_specs(ctx), is_classmethod=True
)
add_overloaded_method_to_class(
ctx.api, ctx.cls, "stmethod", _generate_method_specs(ctx), is_staticmethod=True
)
def _generate_method_specs(ctx: ClassDefContext) -> list[MethodSpec]:
return [
MethodSpec(
args=[Argument(Var("arg"), ctx.api.named_type("builtins.int"), None, ARG_POS)],
return_type=ctx.api.named_type("builtins.str"),
),
MethodSpec(
args=[Argument(Var("arg"), ctx.api.named_type("builtins.str"), None, ARG_POS)],
return_type=ctx.api.named_type("builtins.int"),
),
]
def plugin(version: str) -> type[OverloadedMethodPlugin]:
return OverloadedMethodPlugin
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