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ruff/crates/ruff_python_parser
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Brent Westbrook 6e2b8f9696
[syntax-errors] Detect duplicate keys in match mapping patterns (#17129) 
Summary
--

Detects duplicate literals in `match` mapping keys.

This PR also adds a `source` method to `SemanticSyntaxContext` to
display the duplicated key in the error message by slicing out its
range.

Test Plan
--

New inline tests.
2025-04-03 10:22:37 -04:00
..
resources [syntax-errors] Detect duplicate keys in match mapping patterns (#17129) 2025-04-03 10:22:37 -04:00
src [syntax-errors] Detect duplicate keys in match mapping patterns (#17129) 2025-04-03 10:22:37 -04:00
tests [syntax-errors] Detect duplicate keys in match mapping patterns (#17129) 2025-04-03 10:22:37 -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.