Format binary expressions (#4862)

* Format Binary Expressions

* Extract NeedsParentheses trait

crates/ruff_python_formatter/src/snapshots/ruff_python_formatter__tests__black_test__collections_py.snap

@@ -168,7 +168,7 @@ if True:
 -    2,
 -    3,
 -]
-+[1, 2, 3,]
++[1, 2, 3]
  
 -division_result_tuple = (6 / 2,)
 +division_result_tuple = (6/2,)
@@ -250,7 +250,7 @@ for x in (1,):
 for (x,) in (1,), (2,), (3,):
     pass
 
-[1, 2, 3,]
+[1, 2, 3]
 
 division_result_tuple = (6/2,)
 print("foo %r", (foo.bar,))

crates/ruff_python_formatter/src/snapshots/ruff_python_formatter__tests__black_test__comments_py.snap

@@ -109,7 +109,21 @@ async def wat():
 ```diff
 --- Black
 +++ Ruff
-@@ -19,14 +19,9 @@
+@@ -4,10 +4,12 @@
+ #
+ # Has many lines. Many, many lines.
+ # Many, many, many lines.
+-"""Module docstring.
++(
++    """Module docstring.
+ 
+ Possibly also many, many lines.
+ """
++)
+ 
+ import os.path
+ import sys
+@@ -19,9 +21,6 @@
      import fast
  except ImportError:
      import slow as fast
@@ -117,16 +131,9 @@ async def wat():
 -
 -# Some comment before a function.
  y = 1
--(
--    # some strings
--    y  # type: ignore
--)
-+# some strings
-+y  # type: ignore
- 
- 
- def function(default=None):
-@@ -93,4 +88,4 @@
+ (
+     # some strings
+@@ -93,4 +92,4 @@
  
  # Some closing comments.
  # Maybe Vim or Emacs directives for formatting.
@@ -144,10 +151,12 @@ async def wat():
 #
 # Has many lines. Many, many lines.
 # Many, many, many lines.
-"""Module docstring.
+(
+    """Module docstring.
 
 Possibly also many, many lines.
 """
+)
 
 import os.path
 import sys
@@ -160,8 +169,10 @@ try:
 except ImportError:
     import slow as fast
 y = 1
-# some strings
-y  # type: ignore
+(
+    # some strings
+    y  # type: ignore
+)
 
 
 def function(default=None):

crates/ruff_python_formatter/src/snapshots/ruff_python_formatter__tests__black_test__expression_py.snap

@@ -276,17 +276,7 @@ last_call()
  Name
  None
  True
-@@ -22,119 +23,83 @@
- v1 << 2
- 1 >> v2
- 1 % finished
--1 + v2 - v3 * 4 ^ 5**v6 / 7 // 8
--((1 + v2) - (v3 * 4)) ^ (((5**v6) / 7) // 8)
-+1 + v2 - v3 * 4 ^ 5 ** v6 / 7 // 8
-+((1 + v2) - (v3 * 4)) ^ (((5 ** v6) / 7) // 8)
- not great
- ~great
- +value
+@@ -30,56 +31,39 @@
  -1
  ~int and not v1 ^ 123 + v2 | True
  (~int) and (not ((v1 ^ (123 + v2)) | True))
@@ -312,14 +302,14 @@ last_call()
  (str or None) if True else (str or bytes or None)
  str or None if (1 if True else 2) else str or bytes or None
  (str or None) if (1 if True else 2) else (str or bytes or None)
--(
+ (
 -    (super_long_variable_name or None)
 -    if (1 if super_long_test_name else 2)
 -    else (str or bytes or None)
--)
++    (super_long_variable_name or None) if (1 if super_long_test_name else 2) else (str or bytes or None)
+ )
 -{"2.7": dead, "3.7": (long_live or die_hard)}
 -{"2.7": dead, "3.7": (long_live or die_hard), **{"3.6": verygood}}
-+(super_long_variable_name or None) if (1 if super_long_test_name else 2) else (str or bytes or None)
 +{'2.7': dead, '3.7': (long_live or die_hard)}
 +{'2.7': dead, '3.7': (long_live or die_hard), **{'3.6': verygood}}
  {**a, **b, **c}
@@ -338,7 +328,7 @@ last_call()
 -    2,
 -    3,
 -]
-+[1, 2, 3,]
++[1, 2, 3]
  [*a]
  [*range(10)]
 -[
@@ -351,15 +341,14 @@ last_call()
 -    *a,
 -    5,
 -]
--[
--    this_is_a_very_long_variable_which_will_force_a_delimiter_split,
--    element,
--    another,
--    *more,
--]
-+[*a, 4, 5,]
-+[4, *a, 5,]
-+[this_is_a_very_long_variable_which_will_force_a_delimiter_split, element, another, *more]
++[*a, 4, 5]
++[4, *a, 5]
+ [
+     this_is_a_very_long_variable_which_will_force_a_delimiter_split,
+     element,
+@@ -87,54 +71,44 @@
+     *more,
+ ]
  {i for i in (1, 2, 3)}
 -{(i**2) for i in (1, 2, 3)}
 -{(i**2) for i, _ in ((1, "a"), (2, "b"), (3, "c"))}
@@ -417,18 +406,21 @@ last_call()
  dict[str, int]
  tuple[str, ...]
 -tuple[str, int, float, dict[str, int]]
- tuple[
+-tuple[
 -    str,
 -    int,
 -    float,
 -    dict[str, int],
++(
++    tuple[
 +    str, int, float, dict[str, int]
  ]
++)
 +tuple[str, int, float, dict[str, int],]
  very_long_variable_name_filters: t.List[
      t.Tuple[str, t.Union[str, t.List[t.Optional[str]]]],
  ]
-@@ -144,9 +109,9 @@
+@@ -144,9 +118,9 @@
  xxxx_xxx_xxxx_xxxxx_xxxx_xxx: Callable[..., List[SomeClass]] = classmethod(  # type: ignore
      sync(async_xxxx_xxx_xxxx_xxxxx_xxxx_xxx.__func__)
  )
@@ -441,7 +433,7 @@ last_call()
  slice[0]
  slice[0:1]
  slice[0:1:2]
-@@ -174,57 +139,29 @@
+@@ -174,57 +148,29 @@
  numpy[:, ::-1]
  numpy[np.newaxis, :]
  (str or None) if (sys.version_info[0] > (3,)) else (str or bytes or None)
@@ -450,9 +442,8 @@ last_call()
 +{'2.7': dead, '3.7': long_live or die_hard}
 +{'2.7', '3.6', '3.7', '3.8', '3.9', '4.0' if gilectomy else '3.10'}
  [1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or A, 11 or B, 12 or C]
--(SomeName)
+ (SomeName)
  SomeName
-+SomeName
  (Good, Bad, Ugly)
  (i for i in (1, 2, 3))
 -((i**2) for i in (1, 2, 3))
@@ -511,7 +502,7 @@ last_call()
  Ø = set()
  authors.łukasz.say_thanks()
  mapping = {
-@@ -237,134 +174,86 @@
+@@ -237,114 +183,80 @@
  
  def gen():
      yield from outside_of_generator
@@ -655,30 +646,7 @@ last_call()
 +    ~ aaaaaaaaaaaaaaaa.a + aaaaaaaaaaaaaaaa.b - aaaaaaaaaaaaaaaa.c * aaaaaaaaaaaaaaaa.d @ aaaaaaaaaaaaaaaa.e | aaaaaaaaaaaaaaaa.f & aaaaaaaaaaaaaaaa.g % aaaaaaaaaaaaaaaa.h ^ aaaaaaaaaaaaaaaa.i << aaaaaaaaaaaaaaaa.k >> aaaaaaaaaaaaaaaa.l ** aaaaaaaaaaaaaaaa.m // aaaaaaaaaaaaaaaa.n
  ):
      return True
--(
--    aaaaaaaaaaaaaaaa
--    + aaaaaaaaaaaaaaaa
--    - aaaaaaaaaaaaaaaa
--    * (aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa)
--    / (aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa)
--)
-+aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa - aaaaaaaaaaaaaaaa * (aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa) / (aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa)
- aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa
--(
--    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
--    >> aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
--    << aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
--)
-+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa >> aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa << aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
- bbbb >> bbbb * bbbb
--(
--    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
--    ^ bbbb.a & aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
--    ^ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
--)
-+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ^bbbb.a & aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa^aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
- last_call()
- # standalone comment at ENDMARKER
+ (
 ```
 
 ## Ruff Output
@@ -709,8 +677,8 @@ Name1 or Name2 and Name3 or Name4
 v1 << 2
 1 >> v2
 1 % finished
-1 + v2 - v3 * 4 ^ 5 ** v6 / 7 // 8
-((1 + v2) - (v3 * 4)) ^ (((5 ** v6) / 7) // 8)
+1 + v2 - v3 * 4 ^ 5**v6 / 7 // 8
+((1 + v2) - (v3 * 4)) ^ (((5**v6) / 7) // 8)
 not great
 ~great
 +value
@@ -731,7 +699,9 @@ str or None if True else str or bytes or None
 (str or None) if True else (str or bytes or None)
 str or None if (1 if True else 2) else str or bytes or None
 (str or None) if (1 if True else 2) else (str or bytes or None)
-(super_long_variable_name or None) if (1 if super_long_test_name else 2) else (str or bytes or None)
+(
+    (super_long_variable_name or None) if (1 if super_long_test_name else 2) else (str or bytes or None)
+)
 {'2.7': dead, '3.7': (long_live or die_hard)}
 {'2.7': dead, '3.7': (long_live or die_hard), **{'3.6': verygood}}
 {**a, **b, **c}
@@ -743,12 +713,17 @@ str or None if (1 if True else 2) else str or bytes or None
 (1, 2, 3)
 []
 [1, 2, 3, 4, 5, 6, 7, 8, 9, (10 or A), (11 or B), (12 or C)]
-[1, 2, 3,]
+[1, 2, 3]
 [*a]
 [*range(10)]
-[*a, 4, 5,]
-[4, *a, 5,]
-[this_is_a_very_long_variable_which_will_force_a_delimiter_split, element, another, *more]
+[*a, 4, 5]
+[4, *a, 5]
+[
+    this_is_a_very_long_variable_which_will_force_a_delimiter_split,
+    element,
+    another,
+    *more,
+]
 {i for i in (1, 2, 3)}
 {(i ** 2) for i in (1, 2, 3)}
 {(i ** 2) for i, _ in ((1, 'a'), (2, 'b'), (3, 'c'))}
@@ -782,9 +757,11 @@ call.me(maybe)
 list[str]
 dict[str, int]
 tuple[str, ...]
-tuple[
+(
+    tuple[
     str, int, float, dict[str, int]
 ]
+)
 tuple[str, int, float, dict[str, int],]
 very_long_variable_name_filters: t.List[
     t.Tuple[str, t.Union[str, t.List[t.Optional[str]]]],
@@ -828,7 +805,7 @@ numpy[np.newaxis, :]
 {'2.7': dead, '3.7': long_live or die_hard}
 {'2.7', '3.6', '3.7', '3.8', '3.9', '4.0' if gilectomy else '3.10'}
 [1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or A, 11 or B, 12 or C]
-SomeName
+(SomeName)
 SomeName
 (Good, Bad, Ugly)
 (i for i in (1, 2, 3))
@@ -936,11 +913,25 @@ if (
     ~ aaaaaaaaaaaaaaaa.a + aaaaaaaaaaaaaaaa.b - aaaaaaaaaaaaaaaa.c * aaaaaaaaaaaaaaaa.d @ aaaaaaaaaaaaaaaa.e | aaaaaaaaaaaaaaaa.f & aaaaaaaaaaaaaaaa.g % aaaaaaaaaaaaaaaa.h ^ aaaaaaaaaaaaaaaa.i << aaaaaaaaaaaaaaaa.k >> aaaaaaaaaaaaaaaa.l ** aaaaaaaaaaaaaaaa.m // aaaaaaaaaaaaaaaa.n
 ):
     return True
-aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa - aaaaaaaaaaaaaaaa * (aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa) / (aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa)
+(
+    aaaaaaaaaaaaaaaa
+    + aaaaaaaaaaaaaaaa
+    - aaaaaaaaaaaaaaaa
+    * (aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa)
+    / (aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa)
+)
 aaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaa
-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa >> aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa << aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+(
+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+    >> aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+    << aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+)
 bbbb >> bbbb * bbbb
-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ^bbbb.a & aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa^aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+(
+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+    ^ bbbb.a & aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+    ^ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+)
 last_call()
 # standalone comment at ENDMARKER
 ```

crates/ruff_python_formatter/src/snapshots/ruff_python_formatter__tests__black_test__slices_py.snap

@@ -76,16 +76,51 @@ x[
 ```diff
 --- Black
 +++ Ruff
-@@ -56,4 +56,8 @@
+@@ -31,14 +31,17 @@
+ ham[lower + offset : upper + offset]
+ 
+ slice[::, ::]
+-slice[
++(
++    slice[
+     # A
+     :
+     # B
+     :
+     # C
+ ]
+-slice[
++)
++(
++    slice[
+     # A
+     1:
+     # B
+@@ -46,8 +49,10 @@
+     # C
+     3
+ ]
++)
+ 
+-slice[
++(
++    slice[
+     # A
+     1
+     + 2 :
+@@ -56,4 +61,11 @@
      # C
      4
  ]
 -x[1:2:3]  # A  # B  # C
-+x[
++)
++(
++    x[
 +    1:  # A
 +    2:  # B
 +    3  # C
 +]
++)
 ```
 
 ## Ruff Output
@@ -124,14 +159,17 @@ ham[: upper_fn(x) : step_fn(x)], ham[:: step_fn(x)]
 ham[lower + offset : upper + offset]
 
 slice[::, ::]
-slice[
+(
+    slice[
     # A
     :
     # B
     :
     # C
 ]
-slice[
+)
+(
+    slice[
     # A
     1:
     # B
@@ -139,8 +177,10 @@ slice[
     # C
     3
 ]
+)
 
-slice[
+(
+    slice[
     # A
     1
     + 2 :
@@ -149,11 +189,14 @@ slice[
     # C
     4
 ]
-x[
+)
+(
+    x[
     1:  # A
     2:  # B
     3  # C
 ]
+)
 ```
 
 ## Black Output

crates/ruff_python_formatter/src/snapshots/ruff_python_formatter__tests__black_test__torture_py.snap

@@ -42,14 +42,13 @@ assert (
 ```diff
 --- Black
 +++ Ruff
-@@ -1,58 +1,33 @@
- importA
--(
--    ()
--    << 0
+@@ -2,18 +2,13 @@
+ (
+     ()
+     << 0
 -    ** 101234234242352525425252352352525234890264906820496920680926538059059209922523523525
--)  #
-+() << 0 ** 101234234242352525425252352352525234890264906820496920680926538059059209922523523525  #
++    **101234234242352525425252352352525234890264906820496920680926538059059209922523523525
+ )  #
  
  assert sort_by_dependency(
      {
@@ -65,12 +64,7 @@ assert (
      }
  ) == ["2a", "2b", "2", "3a", "3b", "3", "1"]
  
- importA
- 0
--0 ^ 0  #
-+0^0  #
- 
- 
+@@ -25,34 +20,18 @@
  class A:
      def foo(self):
          for _ in range(10):
@@ -120,7 +114,11 @@ assert (
 
 ```py
 importA
-() << 0 ** 101234234242352525425252352352525234890264906820496920680926538059059209922523523525  #
+(
+    ()
+    << 0
+    **101234234242352525425252352352525234890264906820496920680926538059059209922523523525
+)  #
 
 assert sort_by_dependency(
     {
@@ -131,7 +129,7 @@ assert sort_by_dependency(
 
 importA
 0
-0^0  #
+0 ^ 0  #
 
 
 class A:

crates/ruff_python_formatter/src/snapshots/ruff_python_formatter__tests__ruff_test__expression__binary_expression_py.snap

@@ -0,0 +1,123 @@
+---
+source: crates/ruff_python_formatter/src/lib.rs
+expression: snapshot
+---
+## Input
+```py
+(aaaaaaaa
+    + # trailing operator comment
+    b # trailing right comment
+)
+
+
+(aaaaaaaa # trailing left comment
+    +  # trailing operator comment
+    # leading right comment
+    b
+)
+
+
+# Black breaks the right side first for the following expressions:
+aaaaaaaaaaaaaa + caaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaal(argument1, argument2, argument3)
+aaaaaaaaaaaaaa + [bbbbbbbbbbbbbbbbbbbbbb, ccccccccccccccccccccc, dddddddddddddddd, eeeeeee]
+aaaaaaaaaaaaaa + (bbbbbbbbbbbbbbbbbbbbbb, ccccccccccccccccccccc, dddddddddddddddd, eeeeeee)
+aaaaaaaaaaaaaa + { key1:bbbbbbbbbbbbbbbbbbbbbb, key2: ccccccccccccccccccccc, key3: dddddddddddddddd, key4: eeeeeee }
+aaaaaaaaaaaaaa + { bbbbbbbbbbbbbbbbbbbbbb, ccccccccccccccccccccc, dddddddddddddddd, eeeeeee }
+aaaaaaaaaaaaaa + [a for x in bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb ]
+aaaaaaaaaaaaaa + (a for x in bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb )
+aaaaaaaaaaaaaa + {a for x in bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb}
+
+# Wraps it in parentheses if it needs to break both left and right
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + [
+    bbbbbbbbbbbbbbbbbbbbbb,
+    ccccccccccccccccccccc,
+    dddddddddddddddd,
+    eee
+] # comment
+
+
+
+# But only for expressions that have a statement parent.
+not (aaaaaaaaaaaaaa + {a for x in bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb})
+[a + [bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb] in c ]
+
+
+# leading comment
+(
+    # comment
+    content + b
+)
+```
+
+
+
+## Output
+```py
+(
+    aaaaaaaa
+    + b  # trailing operator comment  # trailing right comment
+)
+
+
+(
+    aaaaaaaa  # trailing left comment
+    +  # trailing operator comment
+    # leading right comment
+    b
+)
+# Black breaks the right side first for the following expressions:
+(
+    aaaaaaaaaaaaaa
+    + caaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaal(argument1, argument2, argument3)
+)
+aaaaaaaaaaaaaa + [
+    bbbbbbbbbbbbbbbbbbbbbb,
+    ccccccccccccccccccccc,
+    dddddddddddddddd,
+    eeeeeee,
+]
+(
+    aaaaaaaaaaaaaa
+    + (bbbbbbbbbbbbbbbbbbbbbb, ccccccccccccccccccccc, dddddddddddddddd, eeeeeee)
+)
+(
+    aaaaaaaaaaaaaa
+    + { key1:bbbbbbbbbbbbbbbbbbbbbb, key2: ccccccccccccccccccccc, key3: dddddddddddddddd, key4: eeeeeee }
+)
+(
+    aaaaaaaaaaaaaa
+    + { bbbbbbbbbbbbbbbbbbbbbb, ccccccccccccccccccccc, dddddddddddddddd, eeeeeee }
+)
+(
+    aaaaaaaaaaaaaa
+    + [a for x in bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb ]
+)
+(
+    aaaaaaaaaaaaaa
+    + (a for x in bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb )
+)
+(
+    aaaaaaaaaaaaaa
+    + {a for x in bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb}
+)
+# Wraps it in parentheses if it needs to break both left and right
+(
+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+    + [bbbbbbbbbbbbbbbbbbbbbb, ccccccccccccccccccccc, dddddddddddddddd, eee]
+)  # comment
+# But only for expressions that have a statement parent.
+(
+    not (aaaaaaaaaaaaaa + {a for x in bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb})
+)
+[
+    a + [bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb] in c,
+]
+# leading comment
+(
+    # comment
+    content
+    + b
+)
+```
+
+