Fix long lines with power operator(s) getting splitted before line length (#3942)

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

diff --git a/src/black/linegen.py b/src/black/linegen.py
index faeb3ba664c3f8714b3770d6e6e29d125d3263d1..d12ca39d0372972cef62043b230fa5785d67bd7f 100644 (file)
--- a/src/black/linegen.py
+++ b/src/black/linegen.py
@@ -536,6 +536,17 @@ class LineGenerator(Visitor[Line]):
         self.visit_case_block = self.visit_match_case
 
 
         self.visit_case_block = self.visit_match_case
 
 

+def _hugging_power_ops_line_to_string(
+    line: Line,
+    features: Collection[Feature],
+    mode: Mode,
+) -> Optional[str]:
+    try:
+        return line_to_string(next(hug_power_op(line, features, mode)))
+    except CannotTransform:
+        return None
+
+

 def transform_line(
     line: Line, mode: Mode, features: Collection[Feature] = ()
 ) -> Iterator[Line]:
 def transform_line(
     line: Line, mode: Mode, features: Collection[Feature] = ()
 ) -> Iterator[Line]:


@@ -551,6 +562,14 @@ def transform_line(
 
     line_str = line_to_string(line)
 
 
     line_str = line_to_string(line)
 

+    # We need the line string when power operators are hugging to determine if we should
+    # split the line. Default to line_str, if no power operator are present on the line.
+    line_str_hugging_power_ops = (
+        (_hugging_power_ops_line_to_string(line, features, mode) or line_str)
+        if Preview.fix_power_op_line_length in mode
+        else line_str
+    )
+

     ll = mode.line_length
     sn = mode.string_normalization
     string_merge = StringMerger(ll, sn)
     ll = mode.line_length
     sn = mode.string_normalization
     string_merge = StringMerger(ll, sn)


@@ -564,7 +583,7 @@ def transform_line(
         and not line.should_split_rhs
         and not line.magic_trailing_comma
         and (
         and not line.should_split_rhs
         and not line.magic_trailing_comma
         and (

-            is_line_short_enough(line, mode=mode, line_str=line_str)
+            is_line_short_enough(line, mode=mode, line_str=line_str_hugging_power_ops)

             or line.contains_unsplittable_type_ignore()
         )
         and not (line.inside_brackets and line.contains_standalone_comments())
             or line.contains_unsplittable_type_ignore()
         )
         and not (line.inside_brackets and line.contains_standalone_comments())