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Summary -- This PR reimplements [load-before-global-declaration (PLE0118)](https://docs.astral.sh/ruff/rules/load-before-global-declaration/) as a semantic syntax error. I added a `global` method to the `SemanticSyntaxContext` trait to make this very easy, at least in ruff. Does red-knot have something similar? If this approach will also work in red-knot, I think some of the other PLE rules are also compile-time errors in CPython, PLE0117 in particular. 0115 and 0116 also mention `SyntaxError`s in their docs, but I haven't confirmed them in the REPL yet. Test Plan -- Existing linter tests for PLE0118. I think this actually can't be tested very easily in an inline test because the `TestContext` doesn't have a real way to track globals. --------- Co-authored-by: Micha Reiser <micha@reiser.io> |
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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.