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ruff/crates/ruff_python_parser
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Brent Westbrook d5410ef9fe
[syntax-errors] Make duplicate parameter names a semantic error (#17131) 
Status
--

This is a pretty minor change, but it was breaking a red-knot mdtest
until #17463 landed. Now this should close #11934 as the last syntax
error being tracked there!

Summary
--

Moves `Parser::validate_parameters` to
`SemanticSyntaxChecker::duplicate_parameter_name`.

Test Plan
--

Existing tests, with `## Errors` replaced with `## Semantic Syntax
Errors`.
2025-04-23 15:45:51 -04:00
..
resources Refactor semantic syntax error scope handling (#17314) 2025-04-09 14:23:29 -04:00
src [syntax-errors] Make duplicate parameter names a semantic error (#17131) 2025-04-23 15:45:51 -04:00
tests [syntax-errors] Make duplicate parameter names a semantic error (#17131) 2025-04-23 15:45:51 -04:00
Cargo.toml Allow passing ParseOptions to inline tests (#16357) 2025-02-27 10:23:15 -05:00
CONTRIBUTING.md Update pre-commit dependencies (#17073) 2025-03-31 07:42:15 +00:00
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.