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Summary -- This PR fixes the issue pointed out by @JelleZijlstra in https://github.com/astral-sh/ruff/pull/17101#issuecomment-2777480204. Namely, I conflated two very different errors from CPython: ```pycon >>> def m[T](x: (yield from 1)): ... File "<python-input-310>", line 1 def m[T](x: (yield from 1)): ... ^^^^^^^^^^^^ SyntaxError: yield expression cannot be used within the definition of a generic >>> def m(x: (yield from 1)): ... File "<python-input-311>", line 1 def m(x: (yield from 1)): ... ^^^^^^^^^^^^ SyntaxError: 'yield from' outside function >>> def outer(): ... def m(x: (yield from 1)): ... ... >>> ``` I thought the second error was the same as the first, but `yield` (and `yield from`) is actually valid in this position when inside a function scope. The same is true for base classes, as pointed out in the original comment. We don't currently raise an error for `yield` outside of a function, but that should be handled separately. On the upside, this had the benefit of removing the `InvalidExpressionPosition::BaseClass` variant and the `allow_named_expr` field from the visitor because they were both no longer used. Test Plan -- Updated inline 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.