## Summary
This PR adds formatting support for `MatchCase` node with subs for the
`Pattern`
nodes.
## Test Plan
Added test cases for case node handling with comments, newlines.
resolves: #6299
We currently don't format all comments as match statements are not yet implemented. We can work around this for the top level match statement by setting them manually formatted but the mocked-out top level match doesn't call into its children so they would still have unformatted comments
## Summary
This PR removes the group around function definition parameters, instead
grouping the parameters with the type parameters and return type
annotation.
This increases Zulip's similarity score from 0.99385 to 0.99699, so it's
a meaningful improvement. However, there's at least one stability error
that I'm working on, and I'm really just looking for high-level feedback
at this point, because I'm not happy with the solution.
Closes https://github.com/astral-sh/ruff/issues/6352.
## Test Plan
Before:
- `zulip`: 0.99396
- `django`: 0.99784
- `warehouse`: 0.99578
- `build`: 0.75436
- `transformers`: 0.99407
- `cpython`: 0.75987
- `typeshed`: 0.74432
After:
- `zulip`: 0.99702
- `django`: 0.99784
- `warehouse`: 0.99585
- `build`: 0.75623
- `transformers`: 0.99470
- `cpython`: 0.75988
- `typeshed`: 0.74853
## Summary
This PR moves `empty_parenthesized` such that it's peer to
`parenthesized`, and changes the API to better match that of
`parenthesized` (takes `&str` rather than `StaticText`, has a
`with_dangling_comments` method, etc.).
It may be intentionally _not_ part of `parentheses.rs`, but to me
they're so similar that it makes more sense for them to be in the same
module, with the same API, etc.
## Summary
This PR adds support for `StmtMatch` with subs for `MatchCase`.
## Test Plan
Add a few additional test cases around `match` statement, comments, line
breaks.
resolves: #6298
## Summary
I noticed some deviations in how we treat dangling comments that hug the
opening parenthesis for function definitions.
For example, given:
```python
def f( # first
# second
): # third
...
```
We currently format as:
```python
def f(
# first
# second
): # third
...
```
This PR adds the proper opening-parenthesis dangling comment handling
for function parameters. Specifically, as with all other parenthesized
nodes, we now detect that dangling comment in `placement.rs` and handle
it in `parameters.rs`. We have to take some care in that file, since we
have multiple "kinds" of dangling comments, but I added a bunch of test
cases that we now format identically to Black.
## Test Plan
`cargo test`
Before:
- `zulip`: 0.99388
- `django`: 0.99784
- `warehouse`: 0.99504
- `transformers`: 0.99404
- `cpython`: 0.75913
- `typeshed`: 0.74364
After:
- `zulip`: 0.99386
- `django`: 0.99784
- `warehouse`: 0.99504
- `transformers`: 0.99404
- `cpython`: 0.75913
- `typeshed`: 0.74409
Meaningful improvement on `typeshed`, minor decrease on `zulip`.
## Summary
Fixes an instability whereby this:
```python
def get_recent_deployments(threshold_days: int) -> Set[str]:
# Returns a list of deployments not older than threshold days
# including `/root/zulip` directory if it exists.
recent = set()
threshold_date = datetime.datetime.now() - datetime.timedelta( # noqa: DTZ005
days=threshold_days
)
```
Was being formatted as:
```python
def get_recent_deployments(threshold_days: int) -> Set[str]:
# Returns a list of deployments not older than threshold days
# including `/root/zulip` directory if it exists.
recent = set()
threshold_date = (
datetime.datetime.now()
- datetime.timedelta(days=threshold_days) # noqa: DTZ005
)
```
Which was in turn being formatted as:
```python
def get_recent_deployments(threshold_days: int) -> Set[str]:
# Returns a list of deployments not older than threshold days
# including `/root/zulip` directory if it exists.
recent = set()
threshold_date = (
datetime.datetime.now() - datetime.timedelta(days=threshold_days) # noqa: DTZ005
)
```
The second-to-third formattings still differs from Black because we
aren't taking the line suffix into account when splitting
(https://github.com/astral-sh/ruff/issues/6377), but the first
formatting is correct and should be unchanged (i.e., the first-to-second
formattings is incorrect, and fixed here).
## Test Plan
`cargo run --bin ruff_dev -- format-dev --stability-check ../zulip`
## Summary
Previously, the ruff formatter was removing the star argument of
`lambda` expressions when formatting.
Given the following code snippet
```python
lambda *a: ()
lambda **b: ()
```
it would be formatted to
```python
lambda: ()
lambda: ()
```
We fix this by checking for the presence of `args`, `vararg` or `kwarg`
in the `lambda` expression, before we were only checking for the
presence of `args`.
Fixes#5894
## Test Plan
Add new tests cases.
---------
Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>
## Summary
This PR leverages the `Arguments` AST node introduced in #6259 in the
formatter, which ensures that we correctly handle trailing comments in
calls, like:
```python
f(
1,
# comment
)
pass
```
(Previously, this was treated as a leading comment on `pass`.)
This also allows us to unify the argument handling across calls and
class definitions.
## Test Plan
A bunch of new fixture tests, plus improved Black compatibility.
## Summary
This PR renames...
- `Parameter#arg` to `Parameter#name`
- `ParameterWithDefault#def` to `ParameterWithDefault#parameter` (such
that `ParameterWithDefault` has a `default` and a `parameter`)
## Test Plan
`cargo test`
## Summary
This PR renames a few AST nodes for clarity:
- `Arguments` is now `Parameters`
- `Arg` is now `Parameter`
- `ArgWithDefault` is now `ParameterWithDefault`
For now, the attribute names that reference `Parameters` directly are
changed (e.g., on `StmtFunctionDef`), but the attributes on `Parameters`
itself are not (e.g., `vararg`). We may revisit that decision in the
future.
For context, the AST node formerly known as `Arguments` is used in
function definitions. Formally (outside of the Python context),
"arguments" typically refers to "the values passed to a function", while
"parameters" typically refers to "the variables used in a function
definition". E.g., if you Google "arguments vs parameters", you'll get
some explanation like:
> A parameter is a variable in a function definition. It is a
placeholder and hence does not have a concrete value. An argument is a
value passed during function invocation.
We're thus deviating from Python's nomenclature in favor of a scheme
that we find to be more precise.
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## Summary
This PR removes the `type_comment` field which our parser doesn't support.
<!-- What's the purpose of the change? What does it do, and why? -->
## Test Plan
`cargo test`
<!-- How was it tested? -->
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## Summary
This PR removes the type ignore node from the AST because our parser doesn't support it, and just having it around is confusing.
<!-- What's the purpose of the change? What does it do, and why? -->
## Test Plan
`cargo build`
<!-- How was it tested? -->
## Summary
This is a rewrite of the main comment placement logic. `place_comment`
now has three parts:
- place own line comments
- between branches
- after a branch
- place end-of-line comments
- after colon
- after a branch
- place comments for specific nodes (that include module level comments)
The rewrite fixed three bugs: `class A: # trailing comment` comments now
stay end-of-line, `try: # comment` remains end-of-line and deeply
indented try-else-finally comments remain with the right nested
statement.
It will be much easier to give more alternative branches nodes since
this is abstracted away by `is_node_with_body` and the first/last child
helpers. Adding new node types can now be done by adding an entry to the
`place_comment` match. The code went from 1526 lines before #6033 to
1213 lines now.
It thinks it easier to just read the new `placement.rs` rather than
reviewing the diff.
## Test Plan
The existing fixtures staying the same or improving plus new ones for
the bug fixes.
**Summary** Fix an instability in with statement formatter when there is
an own line comment as the `as`
```python
with (
a as
# bad comment
b):
```
**Test Plan** Added the comment to the test cases.
## Summary
This crate now contains utilities for dealing with trivia more broadly:
whitespace, newlines, "simple" trivia lexing, etc. So renaming it to
reflect its increased responsibilities.
To avoid conflicts, I've also renamed `Token` and `TokenKind` to
`SimpleToken` and `SimpleTokenKind`.
## Summary
The motivation here is that it will make this rule easier to rewrite as
a deferred check. Right now, we can't run this rule in the deferred
phase, because it depends on the `except_handler` to power its autofix.
Instead of lexing the `except_handler`, we can use the `SimpleTokenizer`
from the formatter, and just lex forwards and backwards.
For context, this rule detects the unused `e` in:
```python
try:
pass
except ValueError as e:
pass
```
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## Summary
This PR improves the parentheses handling for with items to get closer
to black's formatting.
### Case 1:
```python
# Black / Input
with (
[
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
"bbbbbbbbbb",
"cccccccccccccccccccccccccccccccccccccccccc",
dddddddddddddddddddddddddddddddd,
] as example1,
aaaaaaaaaaaaaaaaaaaaaaaaaa
+ bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+ cccccccccccccccccccccccccccc
+ ddddddddddddddddd as example2,
CtxManager2() as example2,
CtxManager2() as example2,
CtxManager2() as example2,
):
...
# Before
with (
[
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
"bbbbbbbbbb",
"cccccccccccccccccccccccccccccccccccccccccc",
dddddddddddddddddddddddddddddddd,
] as example1,
(
aaaaaaaaaaaaaaaaaaaaaaaaaa
+ bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+ cccccccccccccccccccccccccccc
+ ddddddddddddddddd
) as example2,
CtxManager2() as example2,
CtxManager2() as example2,
CtxManager2() as example2,
):
...
```
Notice how Ruff wraps the binary expression in an extra set of
parentheses
### Case 2:
Black does not expand the with-items if the with has no parentheses:
```python
# Black / Input
with aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb as c:
...
# Before
with (
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb as c
):
...
```
Or
```python
# Black / Input
with [
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
"bbbbbbbbbb",
"cccccccccccccccccccccccccccccccccccccccccc",
dddddddddddddddddddddddddddddddd,
] as example1, aaaaaaaaaaaaaaaaaaaaaaaaaa * bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb * cccccccccccccccccccccccccccc + ddddddddddddddddd as example2, CtxManager222222222222222() as example2:
...
# Before (Same as Case 1)
with (
[
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
"bbbbbbbbbb",
"cccccccccccccccccccccccccccccccccccccccccc",
dddddddddddddddddddddddddddddddd,
] as example1,
(
aaaaaaaaaaaaaaaaaaaaaaaaaa
* bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
* cccccccccccccccccccccccccccc
+ ddddddddddddddddd
) as example2,
CtxManager222222222222222() as example2,
):
...
```
## Test Plan
I added new snapshot tests
Improves the django similarity index from 0.973 to 0.977
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## Summary
This PR improves the Black compatibility when it comes to breaking comprehensions.
We want to avoid line breaks before the target and `in` whenever possible. Furthermore, `if X is not None` should be grouped together, similar to other binary like expressions
<!-- What's the purpose of the change? What does it do, and why? -->
## Test Plan
`cargo test`
<!-- How was it tested? -->
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## Summary
I started working on this because I assumed that I would need access to options inside of `NeedsParantheses` but it then turned out that I won't.
Anyway, it kind of felt nice to pass fewer arguments. So I'm gonna put this out here to get your feedback if you prefer this over passing individual fiels.
Oh, I sneeked in another change. I renamed `context.contents` to `source`. `contents` is too generic and doesn't tell you anything.
<!-- What's the purpose of the change? What does it do, and why? -->
## Test Plan
It compiles
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## Summary
This PR implements Black's behavior where it first splits off parenthesized expressions before splitting before operands to avoid unnecessary parentheses:
```python
# We want
if a + [
b,
c
]:
pass
# Rather than
if (
a
+ [b, c]
):
pass
```
This is implemented by using the new IR elements introduced in #5596.
* We give the group wrapping the optional parentheses an ID (`parentheses_id`)
* We use `conditional_group` for the lower priority groups (all non-parenthesized expressions) with the condition that the `parentheses_id` group breaks (we want to split before operands only if the parentheses are necessary)
* We use `fits_expanded` to wrap all other parenthesized expressions (lists, dicts, sets), to prevent that expanding e.g. a list expands the `parentheses_id` group. We gate the `fits_expand` to only apply if the `parentheses_id` group fits (because we prefer `a\n+[b, c]` over expanding `[b, c]` if the whole expression gets parenthesized).
We limit using `fits_expanded` and `conditional_group` only to expressions that themselves are not in parentheses (checking the conditions isn't free)
## Test Plan
It increases the Jaccard index for Django from 0.915 to 0.917
## Incompatibilites
There are two incompatibilities left that I'm aware of (there may be more, I didn't go through all snapshot differences).
### Long string literals
I commented on the regression. The issue is that a very long string (or any content without a split point) may not fit when only breaking the right side. The formatter than inserts the optional parentheses. But this is kind of useless because the overlong string will still not fit, because there are no new split points.
I think we should ignore this incompatibility for now
### Expressions on statement level
I don't fully understand the logic behind this yet, but black doesn't break before the operators for the following example even though the expression exceeds the configured line width
```python
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa < bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb > ccccccccccccccccccccccccccccc == ddddddddddddddddddddd
```
But it would if the expression is used inside of a condition.
What I understand so far is that Black doesn't insert optional parentheses on the expression statement level (and a few other places) and, therefore, only breaks after opening parentheses. I propose to keep this deviation for now to avoid overlong-lines and use the compatibility report to make a decision if we should implement the same behavior.
## Summary
Format import statements in all their variants. Specifically, this
implemented formatting `StmtImport`, `StmtImportFrom` and `Alias`.
## Test Plan
I added some custom snapshots, even though this has been covered well by
black's tests.
## Summary
This formats call expressions with magic trailing comma and parentheses
behaviour but without call chaining
## Test Plan
Lots of new test fixtures, including some that don't work yet
## Summary
This is a complete rewrite of the handling of `/` and `*` comment
handling in function signatures. The key problem is that slash and star
don't have a note. We now parse out the positions of slash and star and
their respective preceding and following note. I've left code comments
for each possible case of function signature structure and comment
placement
## Test Plan
I extended the function statement fixtures with cases that i found. If
you have more weird edge cases your input would be appreciated.
## Summary
This PR upgrade RustPython to pull in the changes to `Arguments` (zip
defaults with their identifiers) and all the renames to `CmpOp` and
friends.
## Summary
This fixes a number of problems in the formatter that showed up with
various files in the [cpython](https://github.com/python/cpython)
repository. These problems surfaced as unstable formatting and invalid
code. This is not the entirety of problems discovered through cpython,
but a big enough chunk to separate it. Individual fixes are generally
individual commits. They were discovered with #5055, which i update as i
work through the output
## Test Plan
I added regression tests with links to cpython for each entry, except
for the two stubs that also got comment stubs since they'll be
implemented properly later.
