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ruff/crates/ruff_python_parser
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Brent Westbrook f0fe6d62fb
Fix syntax error false positive on nested alternative patterns (#21104) 
## Summary

Fixes #21101 by storing the child visitor's names in the parent visitor.
This makes sure that `visitor.names` on line 1818 isn't empty after we
visit a nested OR pattern.

## Test Plan

New inline test cases derived from the issue,
[playground](https://play.ruff.rs/7b6439ac-ee8f-4593-9a3e-c2aa34a595d0)
2025-10-30 13:40:03 -04:00
..
resources Fix syntax error false positive on nested alternative patterns (#21104) 2025-10-30 13:40:03 -04:00
src Fix syntax error false positive on nested alternative patterns (#21104) 2025-10-30 13:40:03 -04:00
tests Fix syntax error false positive on nested alternative patterns (#21104) 2025-10-30 13:40:03 -04:00
Cargo.toml [ty] Add environment variable to dump Salsa memory usage stats (#18928) 2025-06-26 21:27:51 +00:00
CONTRIBUTING.md Update usage instructions and lockfile for py-fuzzer script (#20940) 2025-10-17 15:57:17 +01:00
README.md Add basic docs for the parser crate (#11199) 2024-04-29 17:08:07 +00:00

README.md

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.