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from __future__ import annotations
from typing import Callable
from mypy.plugin import CheckerPluginInterface, MethodSigContext, Plugin
from mypy.types import CallableType, Instance, Type, get_proper_type
class MethodSigPlugin(Plugin):
def get_method_signature_hook(
self, fullname: str
) -> Callable[[MethodSigContext], CallableType] | None:
# Ensure that all names are fully qualified
assert not fullname.endswith(" of Foo")
if fullname.startswith("__main__.Foo."):
return my_hook
return None
def _str_to_int(api: CheckerPluginInterface, typ: Type) -> Type:
typ = get_proper_type(typ)
if isinstance(typ, Instance):
if typ.type.fullname == "builtins.str":
return api.named_generic_type("builtins.int", [])
elif typ.args:
return typ.copy_modified(args=[_str_to_int(api, t) for t in typ.args])
return typ
def my_hook(ctx: MethodSigContext) -> CallableType:
return ctx.default_signature.copy_modified(
arg_types=[_str_to_int(ctx.api, t) for t in ctx.default_signature.arg_types],
ret_type=_str_to_int(ctx.api, ctx.default_signature.ret_type),
)
def plugin(version: str) -> type[MethodSigPlugin]:
return MethodSigPlugin
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