Copy over comments when hugging power ops (#2874)

[etc/vim.git] / src / black / trans.py

diff --git a/src/black/trans.py b/src/black/trans.py
index 74d052fe2dcbd0854d11bee16417777e28ed26eb..28d9250adc1fe78d7e788b2d6fd382d00d42073b 100644 (file)
--- a/src/black/trans.py
+++ b/src/black/trans.py
@@ -121,7 +121,7 @@ def hug_power_op(line: Line, features: Collection[Feature]) -> Iterator[Line]:
 
         return False
 
-    leaves: List[Leaf] = []
+    new_line = line.clone()
     should_hug = False
     for idx, leaf in enumerate(line.leaves):
         new_leaf = leaf.clone()
@@ -139,18 +139,14 @@ def hug_power_op(line: Line, features: Collection[Feature]) -> Iterator[Line]:
         if should_hug:
             new_leaf.prefix = ""
 
-        leaves.append(new_leaf)
-
-    yield Line(
-        mode=line.mode,
-        depth=line.depth,
-        leaves=leaves,
-        comments=line.comments,
-        bracket_tracker=line.bracket_tracker,
-        inside_brackets=line.inside_brackets,
-        should_split_rhs=line.should_split_rhs,
-        magic_trailing_comma=line.magic_trailing_comma,
-    )
+        # We have to be careful to make a new line properly:
+        # - bracket related metadata must be maintained (handled by Line.append)
+        # - comments need to copied over, updating the leaf IDs they're attached to
+        new_line.append(new_leaf, preformatted=True)
+        for comment_leaf in line.comments_after(leaf):
+            new_line.append(comment_leaf, preformatted=True)
+
+    yield new_line
 
 
 class StringTransformer(ABC):
@@ -365,7 +361,7 @@ class StringMerger(StringTransformer, CustomSplitMapMixin):
 
         is_valid_index = is_valid_index_factory(LL)
 
-        for (i, leaf) in enumerate(LL):
+        for i, leaf in enumerate(LL):
             if (
                 leaf.type == token.STRING
                 and is_valid_index(i + 1)
@@ -570,7 +566,7 @@ class StringMerger(StringTransformer, CustomSplitMapMixin):
 
         # Build the final line ('new_line') that this method will later return.
         new_line = line.clone()
-        for (i, leaf) in enumerate(LL):
+        for i, leaf in enumerate(LL):
             if i == string_idx:
                 new_line.append(string_leaf)
 
@@ -691,7 +687,7 @@ class StringParenStripper(StringTransformer):
 
         is_valid_index = is_valid_index_factory(LL)
 
-        for (idx, leaf) in enumerate(LL):
+        for idx, leaf in enumerate(LL):
             # Should be a string...
             if leaf.type != token.STRING:
                 continue
@@ -1713,7 +1709,7 @@ class StringParenWrapper(BaseStringSplitter, CustomSplitMapMixin):
         if parent_type(LL[0]) == syms.assert_stmt and LL[0].value == "assert":
             is_valid_index = is_valid_index_factory(LL)
 
-            for (i, leaf) in enumerate(LL):
+            for i, leaf in enumerate(LL):
                 # We MUST find a comma...
                 if leaf.type == token.COMMA:
                     idx = i + 2 if is_empty_par(LL[i + 1]) else i + 1
@@ -1751,7 +1747,7 @@ class StringParenWrapper(BaseStringSplitter, CustomSplitMapMixin):
         ):
             is_valid_index = is_valid_index_factory(LL)
 
-            for (i, leaf) in enumerate(LL):
+            for i, leaf in enumerate(LL):
                 # We MUST find either an '=' or '+=' symbol...
                 if leaf.type in [token.EQUAL, token.PLUSEQUAL]:
                     idx = i + 2 if is_empty_par(LL[i + 1]) else i + 1
@@ -1794,7 +1790,7 @@ class StringParenWrapper(BaseStringSplitter, CustomSplitMapMixin):
         if syms.dictsetmaker in [parent_type(LL[0]), parent_type(LL[0].parent)]:
             is_valid_index = is_valid_index_factory(LL)
 
-            for (i, leaf) in enumerate(LL):
+            for i, leaf in enumerate(LL):
                 # We MUST find a colon...
                 if leaf.type == token.COLON:
                     idx = i + 2 if is_empty_par(LL[i + 1]) else i + 1