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[red-knot] Move the
ClassBase enum to its own submodule
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crates/red_knot_python_semantic/src/types/class_base.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,173 @@ | ||
| use crate::types::{ | ||
| todo_type, Class, ClassLiteralType, KnownClass, KnownInstanceType, TodoType, Type, | ||
| }; | ||
| use crate::Db; | ||
| use itertools::Either; | ||
|
|
||
| /// Enumeration of the possible kinds of types we allow in class bases. | ||
| /// | ||
| /// This is much more limited than the [`Type`] enum: | ||
| /// all types that would be invalid to have as a class base are | ||
| /// transformed into [`ClassBase::Unknown`] | ||
| #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq, salsa::Update)] | ||
| pub enum ClassBase<'db> { | ||
| Any, | ||
| Unknown, | ||
| Todo(TodoType), | ||
| Class(Class<'db>), | ||
| } | ||
|
|
||
| impl<'db> ClassBase<'db> { | ||
| pub fn display(self, db: &'db dyn Db) -> impl std::fmt::Display + 'db { | ||
| struct Display<'db> { | ||
| base: ClassBase<'db>, | ||
| db: &'db dyn Db, | ||
| } | ||
|
|
||
| impl std::fmt::Display for Display<'_> { | ||
| fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { | ||
| match self.base { | ||
| ClassBase::Any => f.write_str("Any"), | ||
| ClassBase::Todo(todo) => todo.fmt(f), | ||
| ClassBase::Unknown => f.write_str("Unknown"), | ||
| ClassBase::Class(class) => write!(f, "<class '{}'>", class.name(self.db)), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| Display { base: self, db } | ||
| } | ||
|
|
||
| /// Return a `ClassBase` representing the class `builtins.object` | ||
| pub(super) fn object(db: &'db dyn Db) -> Self { | ||
| KnownClass::Object | ||
| .to_class_literal(db) | ||
| .into_class_literal() | ||
| .map_or(Self::Unknown, |ClassLiteralType { class }| { | ||
| Self::Class(class) | ||
| }) | ||
| } | ||
|
|
||
| /// Attempt to resolve `ty` into a `ClassBase`. | ||
| /// | ||
| /// Return `None` if `ty` is not an acceptable type for a class base. | ||
| pub(super) fn try_from_ty(db: &'db dyn Db, ty: Type<'db>) -> Option<Self> { | ||
| match ty { | ||
| Type::Any => Some(Self::Any), | ||
| Type::Unknown => Some(Self::Unknown), | ||
| Type::Todo(todo) => Some(Self::Todo(todo)), | ||
| Type::ClassLiteral(ClassLiteralType { class }) => Some(Self::Class(class)), | ||
| Type::Union(_) => None, // TODO -- forces consideration of multiple possible MROs? | ||
| Type::Intersection(_) => None, // TODO -- probably incorrect? | ||
| Type::Instance(_) => None, // TODO -- handle `__mro_entries__`? | ||
| Type::Never | ||
| | Type::BooleanLiteral(_) | ||
| | Type::FunctionLiteral(_) | ||
| | Type::BytesLiteral(_) | ||
| | Type::IntLiteral(_) | ||
| | Type::StringLiteral(_) | ||
| | Type::LiteralString | ||
| | Type::Tuple(_) | ||
| | Type::SliceLiteral(_) | ||
| | Type::ModuleLiteral(_) | ||
| | Type::SubclassOf(_) => None, | ||
| Type::KnownInstance(known_instance) => match known_instance { | ||
| KnownInstanceType::TypeVar(_) | ||
| | KnownInstanceType::TypeAliasType(_) | ||
| | KnownInstanceType::Literal | ||
| | KnownInstanceType::LiteralString | ||
| | KnownInstanceType::Union | ||
| | KnownInstanceType::NoReturn | ||
| | KnownInstanceType::Never | ||
| | KnownInstanceType::Final | ||
| | KnownInstanceType::NotRequired | ||
| | KnownInstanceType::TypeGuard | ||
| | KnownInstanceType::TypeIs | ||
| | KnownInstanceType::TypingSelf | ||
| | KnownInstanceType::Unpack | ||
| | KnownInstanceType::ClassVar | ||
| | KnownInstanceType::Concatenate | ||
| | KnownInstanceType::Required | ||
| | KnownInstanceType::TypeAlias | ||
| | KnownInstanceType::ReadOnly | ||
| | KnownInstanceType::Optional => None, | ||
| KnownInstanceType::Any => Some(Self::Any), | ||
| // TODO: Classes inheriting from `typing.Type` et al. also have `Generic` in their MRO | ||
| KnownInstanceType::Dict => { | ||
| Self::try_from_ty(db, KnownClass::Dict.to_class_literal(db)) | ||
| } | ||
| KnownInstanceType::List => { | ||
| Self::try_from_ty(db, KnownClass::List.to_class_literal(db)) | ||
| } | ||
| KnownInstanceType::Type => { | ||
| Self::try_from_ty(db, KnownClass::Type.to_class_literal(db)) | ||
| } | ||
| KnownInstanceType::Tuple => { | ||
| Self::try_from_ty(db, KnownClass::Tuple.to_class_literal(db)) | ||
| } | ||
| KnownInstanceType::Set => { | ||
| Self::try_from_ty(db, KnownClass::Set.to_class_literal(db)) | ||
| } | ||
| KnownInstanceType::FrozenSet => { | ||
| Self::try_from_ty(db, KnownClass::FrozenSet.to_class_literal(db)) | ||
| } | ||
| KnownInstanceType::Callable | ||
| | KnownInstanceType::ChainMap | ||
| | KnownInstanceType::Counter | ||
| | KnownInstanceType::DefaultDict | ||
| | KnownInstanceType::Deque | ||
| | KnownInstanceType::OrderedDict => Self::try_from_ty( | ||
| db, | ||
| todo_type!("Support for more typing aliases as base classes"), | ||
| ), | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| pub(super) fn into_class_literal_type(self) -> Option<Class<'db>> { | ||
| match self { | ||
| Self::Class(class) => Some(class), | ||
| _ => None, | ||
| } | ||
| } | ||
|
|
||
| /// Iterate over the MRO of this base | ||
| pub(super) fn mro( | ||
| self, | ||
| db: &'db dyn Db, | ||
| ) -> Either<impl Iterator<Item = ClassBase<'db>>, impl Iterator<Item = ClassBase<'db>>> { | ||
| match self { | ||
| ClassBase::Any => Either::Left([ClassBase::Any, ClassBase::object(db)].into_iter()), | ||
| ClassBase::Unknown => { | ||
| Either::Left([ClassBase::Unknown, ClassBase::object(db)].into_iter()) | ||
| } | ||
| ClassBase::Todo(todo) => { | ||
| Either::Left([ClassBase::Todo(todo), ClassBase::object(db)].into_iter()) | ||
| } | ||
| ClassBase::Class(class) => Either::Right(class.iter_mro(db)), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<'db> From<Class<'db>> for ClassBase<'db> { | ||
| fn from(value: Class<'db>) -> Self { | ||
| ClassBase::Class(value) | ||
| } | ||
| } | ||
|
|
||
| impl<'db> From<ClassBase<'db>> for Type<'db> { | ||
| fn from(value: ClassBase<'db>) -> Self { | ||
| match value { | ||
| ClassBase::Any => Type::Any, | ||
| ClassBase::Todo(todo) => Type::Todo(todo), | ||
| ClassBase::Unknown => Type::Unknown, | ||
| ClassBase::Class(class) => Type::class_literal(class), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<'db> From<&ClassBase<'db>> for Type<'db> { | ||
| fn from(value: &ClassBase<'db>) -> Self { | ||
| Self::from(*value) | ||
| } | ||
| } |
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