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Avoiding grouping comprehension targets separately from conditions (#7429)

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## Summary

Black seems to treat comprehension targets and conditions as if they're
in a single group -- so if the comprehension expands, all conditions are
rendered on their own line, etc.

Closes https://github.com/astral-sh/ruff/issues/7421.

## Test Plan

`cargo test`

No change in any of the similarity metrics.

Before:

| project | similarity index | total files | changed files |

|--------------|------------------:|------------------:|------------------:|
| cpython | 0.76083 | 1789 | 1632 |
| django | 0.99982 | 2760 | 37 |
| transformers | 0.99957 | 2587 | 399 |
| twine | 1.00000 | 33 | 0 |
| typeshed | 0.99983 | 3496 | 18 |
| warehouse | 0.99923 | 648 | 18 |
| zulip | 0.99962 | 1437 | 22 |

After:

| project | similarity index | total files | changed files |

|--------------|------------------:|------------------:|------------------:|
| cpython | 0.76083 | 1789 | 1632 |
| django | 0.99982 | 2760 | 37 |
| transformers | 0.99957 | 2587 | 399 |
| twine | 1.00000 | 33 | 0 |
| typeshed | 0.99983 | 3496 | 18 |
| warehouse | 0.99923 | 648 | 18 |
| zulip | 0.99962 | 1437 | 22 |
This commit is contained in:
Charlie Marsh 2023-09-16 13:19:34 -04:00 • committed by GitHub
parent 22770fb4be
commit 7e2eba2592
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 89 additions and 13 deletions
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24
crates/ruff_python_formatter/src/other/comprehension.rs
View file

@ -56,16 +56,14 @@ impl FormatNodeRule<Comprehension> for FormatComprehension {
[
token("for"),
trailing_comments(before_target_comments),
group(&format_args!(
Spacer(target),
ExprTupleWithoutParentheses(target),
in_spacer,
leading_comments(before_in_comments),
token("in"),
trailing_comments(trailing_in_comments),
Spacer(iter),
iter.format(),
)),
Spacer(target),
ExprTupleWithoutParentheses(target),
in_spacer,
leading_comments(before_in_comments),
token("in"),
trailing_comments(trailing_in_comments),
Spacer(iter),
iter.format(),
]
)?;
if !ifs.is_empty() {
@ -79,18 +77,18 @@ impl FormatNodeRule<Comprehension> for FormatComprehension {
dangling_if_comments
.partition_point(|comment| comment.line_position().is_own_line()),
);
joiner.entry(&group(&format_args!(
joiner.entry(&format_args!(
leading_comments(own_line_if_comments),
token("if"),
trailing_comments(end_of_line_if_comments),
Spacer(if_case),
if_case.format(),
)));
));
}
joiner.finish()
});
write!(f, [soft_line_break_or_space(), group(&joined)])?;
write!(f, [soft_line_break_or_space(), joined])?;
}
Ok(())
}