def _infer_constraints(
self,
applied_args: List[FuncArg],
) -> _Constraints:
"""Creates mapping of ``typevar`` to real type that we already know."""
checker = self._ctx.api.expr_checker # type: ignore
kinds = [arg.kind for arg in applied_args]
exprs = [arg.expression(self._ctx.context) for arg in applied_args]
formal_to_actual = map_actuals_to_formals(
kinds,
[arg.name for arg in applied_args],
self._fallback.arg_kinds,
self._fallback.arg_names,
lambda index: checker.accept(exprs[index]),
)
constraints = infer_constraints_for_callable(
self._fallback,
[arg.type for arg in applied_args],
kinds,
formal_to_actual,
)
return {
constraint.type_var: constraint.target
for constraint in constraints
}
def assert_vararg_map(
self,
caller_kinds: List[int],
callee_kinds: List[int],
expected: List[List[int]],
vararg_type: Type,
) -> None:
result = map_actuals_to_formals(caller_kinds, [], callee_kinds, [],
lambda i: vararg_type)
assert_equal(result, expected)
def assert_map(
self,
caller_kinds_: List[Union[int, str]],
callee_kinds_: List[Union[int, Tuple[int, str]]],
expected: List[List[int]],
) -> None:
caller_kinds, caller_names = expand_caller_kinds(caller_kinds_)
callee_kinds, callee_names = expand_callee_kinds(callee_kinds_)
result = map_actuals_to_formals(
caller_kinds, caller_names, callee_kinds, callee_names,
lambda i: AnyType(TypeOfAny.special_form))
assert_equal(result, expected)
def assert_vararg_map(self,
caller_kinds: List[int],
callee_kinds: List[int],
expected: List[List[int]],
vararg_type: Type,
) -> None:
result = map_actuals_to_formals(
caller_kinds,
[],
callee_kinds,
[],
lambda i: vararg_type)
assert_equal(result, expected)
def assert_map(self,
caller_kinds_: List[Union[int, str]],
callee_kinds_: List[Union[int, Tuple[int, str]]],
expected: List[List[int]],
) -> None:
caller_kinds, caller_names = expand_caller_kinds(caller_kinds_)
callee_kinds, callee_names = expand_callee_kinds(callee_kinds_)
result = map_actuals_to_formals(
caller_kinds,
caller_names,
callee_kinds,
callee_names,
lambda i: AnyType(TypeOfAny.special_form))
assert_equal(result, expected)
def _intersection_hook(context: FunctionSigContext):
has_intersection = 'pfun.Intersection' in str(context.default_signature)
is_generic = context.default_signature.is_generic()
if not has_intersection or not is_generic:
return context.default_signature
formal_to_actual = map_actuals_to_formals(
context.context.arg_kinds, context.context.arg_names,
context.default_signature.arg_kinds,
context.default_signature.arg_names,
lambda i: context.api.expr_checker.accept(context.args[0][i]))
callee = freshen_function_type_vars(context.default_signature)
callee = (
context.api.expr_checker.infer_function_type_arguments_using_context(
callee, context.context))
args = [arg for args in context.args for arg in args]
callee = context.api.expr_checker.infer_function_type_arguments(
callee, args, context.context.arg_kinds, formal_to_actual,
context.context)
intersection_translator = TranslateIntersection(context.api,
context.context,
inferred=True)
translated = callee.accept(intersection_translator)
return translated