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Summary -- This PR fixes the issue I added in #20867 and noticed in #20930. Cases like this cause an error on any Python version: ```py f"{1:""}" ``` which gave me a false sense of security before. Cases like this are still invalid only before 3.12 and weren't flagged after the changes in #20867: ```py f'{1: abcd "{'aa'}" }' # ^ reused quote f'{1: abcd "{"\n"}" }' # ^ backslash ``` I didn't recognize these as nested interpolations that also need to be checked for invalid expressions, so filtering out the whole format spec wasn't quite right. And `elements.interpolations()` only iterates over the outermost interpolations, not the nested ones. There's basically no code change in this PR, I just moved the existing check from `parse_interpolated_string`, which parses the entire string, to `parse_interpolated_element`. This kind of seems more natural anyway and avoids having to try to recursively visit nested elements after the fact in `parse_interpolated_string`. So viewing the diff with something like ``` git diff --color-moved --ignore-space-change --color-moved-ws=allow-indentation-change main ``` should make this more clear. Test Plan -- New tests |
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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.