| from typing import Union, List |
| |
| from mypy.nodes import TypeInfo |
| |
| from mypy.erasetype import erase_typevars |
| from mypy.types import Instance, TypeVarType, TupleType, Type, TypeOfAny, AnyType, ParamSpecType |
| |
| |
| def fill_typevars(typ: TypeInfo) -> Union[Instance, TupleType]: |
| """For a non-generic type, return instance type representing the type. |
| |
| For a generic G type with parameters T1, .., Tn, return G[T1, ..., Tn]. |
| """ |
| tvs: List[Type] = [] |
| # TODO: why do we need to keep both typ.type_vars and typ.defn.type_vars? |
| for i in range(len(typ.defn.type_vars)): |
| tv = typ.defn.type_vars[i] |
| # Change the line number |
| if isinstance(tv, TypeVarType): |
| tv = TypeVarType( |
| tv.name, tv.fullname, tv.id, tv.values, |
| tv.upper_bound, tv.variance, line=-1, column=-1, |
| ) |
| else: |
| assert isinstance(tv, ParamSpecType) |
| tv = ParamSpecType(tv.name, tv.fullname, tv.id, tv.flavor, tv.upper_bound, |
| line=-1, column=-1) |
| tvs.append(tv) |
| inst = Instance(typ, tvs) |
| if typ.tuple_type is None: |
| return inst |
| return typ.tuple_type.copy_modified(fallback=inst) |
| |
| |
| def fill_typevars_with_any(typ: TypeInfo) -> Union[Instance, TupleType]: |
| """Apply a correct number of Any's as type arguments to a type.""" |
| inst = Instance(typ, [AnyType(TypeOfAny.special_form)] * len(typ.defn.type_vars)) |
| if typ.tuple_type is None: |
| return inst |
| return typ.tuple_type.copy_modified(fallback=inst) |
| |
| |
| def has_no_typevars(typ: Type) -> bool: |
| # We test if a type contains type variables by erasing all type variables |
| # and comparing the result to the original type. We use comparison by equality that |
| # in turn uses `__eq__` defined for types. Note: we can't use `is_same_type` because |
| # it is not safe with unresolved forward references, while this function may be called |
| # before forward references resolution patch pass. Note also that it is not safe to use |
| # `is` comparison because `erase_typevars` doesn't preserve type identity. |
| return typ == erase_typevars(typ) |