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[red-knot] support deferred evaluation of type expressions (#13131)

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Prototype deferred evaluation of type expressions by deferring
evaluation of class bases in a stub file. This allows self-referential
class definitions, as occur with the definition of `str` in typeshed
(which inherits `Sequence[str]`).

---------

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
This commit is contained in:
Carl Meyer 2024-08-28 11:41:01 -07:00 • committed by GitHub
parent c6023c03a2
commit 770ef2ab27
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3 changed files with 207 additions and 40 deletions
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8
crates/ruff_db/src/files.rs
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@ -8,6 +8,7 @@ use salsa::{Durability, Setter};
pub use file_root::{FileRoot, FileRootKind};
pub use path::FilePath;
use ruff_notebook::{Notebook, NotebookError};
use ruff_python_ast::PySourceType;
use crate::file_revision::FileRevision;
use crate::files::file_root::FileRoots;
@ -424,6 +425,13 @@ impl File {
pub fn exists(self, db: &dyn Db) -> bool {
self.status(db) == FileStatus::Exists
}
/// Returns `true` if the file should be analyzed as a type stub.
pub fn is_stub(self, db: &dyn Db) -> bool {
self.path(db)
.extension()
.is_some_and(|extension| PySourceType::from_extension(extension).is_stub())
}
}
/// A virtual file that doesn't exist on the file system.