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Force parentheses for power operations in unary expressions (#7955)

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## Summary

E.g., given `-10**100`, reformat as `-(10**100)`.

Black special cases this (https://github.com/psf/black/pull/909) and
it's currently a deviation.

Closes https://github.com/astral-sh/ruff/issues/7951.
This commit is contained in:
Charlie Marsh 2023-10-15 21:41:50 -04:00 • committed by GitHub
parent b6e75e58c9
commit 3d03e75a9d
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2 changed files with 10 additions and 12 deletions
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11
crates/ruff_python_formatter/src/expression/expr_unary_op.rs
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@ -4,7 +4,7 @@ use ruff_python_ast::UnaryOp;
use crate::comments::{trailing_comments, SourceComment};
use crate::expression::parentheses::{
is_expression_parenthesized, NeedsParentheses, OptionalParentheses,
is_expression_parenthesized, NeedsParentheses, OptionalParentheses, Parentheses,
};
use crate::prelude::*;
@ -57,7 +57,14 @@ impl FormatNodeRule<ExprUnaryOp> for FormatExprUnaryOp {
space().fmt(f)?;
}
operand.format().fmt(f)
if operand
.as_bin_op_expr()
.is_some_and(|bin_op| bin_op.op.is_pow())
{
operand.format().with_options(Parentheses::Always).fmt(f)
} else {
operand.format().fmt(f)
}
}
fn fmt_dangling_comments(