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## Summary Fixes a panic when parsing IPython escape commands with `Help` kind (`?`) in expression contexts. The parser now reports an error instead of panicking. Fixes #21465. ## Problem The parser panicked with `unreachable!()` in `parse_ipython_escape_command_expression` when encountering escape commands with `Help` kind (`?`) in expression contexts, where only `Magic` (`%`) and `Shell` (`!`) are allowed. ## Approach Replaced the `unreachable!()` panic with error handling that adds a `ParseErrorType::OtherError` and continues parsing, returning a valid AST node with the error attached. ## Test Plan Added `test_ipython_escape_command_in_with_statement` and `test_ipython_help_escape_command_as_expression` to verify the fix. --------- Co-authored-by: Dhruv Manilawala <dhruvmanila@gmail.com> |
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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.