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Summary -- This PR implements detecting the use of `await` expressions outside of async functions. This is a reimplementation of [await-outside-async (PLE1142)](https://docs.astral.sh/ruff/rules/await-outside-async/) as a semantic syntax error. Despite the rule name, PLE1142 also applies to `async for` and `async with`, so these are covered here too. Test Plan -- Existing PLE1142 tests. I also deleted more code from the `SemanticSyntaxCheckerVisitor` to avoid changes in other parser tests. |
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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.