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Summary -- Detect async comprehensions nested in sync comprehensions in async functions before Python 3.11, when this was [changed]. The actual logic of this rule is very straightforward, but properly tracking the async scopes took a bit of work. An alternative to the current approach is to offload the `in_async_context` check into the `SemanticSyntaxContext` trait, but that actually required much more extensive changes to the `TestContext` and also to ruff's semantic model, as you can see in the changes up to 31554b473507034735bd410760fde6341d54a050. This version has the benefit of mostly centralizing the state tracking in `SemanticSyntaxChecker`, although there was some subtlety around deferred function body traversal that made the changes to `Checker` more intrusive too (hence the new linter test). The `Checkpoint` struct/system is obviously overkill for now since it's only tracking a single `bool`, but I thought it might be more useful later. [changed]: https://github.com/python/cpython/issues/77527 Test Plan -- New inline tests and a new linter integration test. |
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Ruff Python Parser
Ruff's Python parser is a hand-written recursive descent parser which can parse Python source code into an Abstract Syntax Tree (AST). It also utilizes the Pratt parsing technique to parse expressions with different precedence.
Try out the parser in the playground.
Python version support
The parser supports the latest Python syntax, which is currently Python 3.12.
It does not throw syntax errors if it encounters a syntax feature that is not
supported by the target-version.
This will be fixed in a future release (see https://github.com/astral-sh/ruff/issues/6591).
Contributing
Refer to the contributing guidelines to get started and GitHub issues with the parser label for issues that need help.