Enforce a blank line after a nested class in stubs (#3564)

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

diff --git a/src/black/lines.py b/src/black/lines.py
index 4b57d1f0ea8c3db10328e52ae94f6c88c9df3ff0..b2bdcc441b48c80c7f1d8d279bbb11cf364fafbf 100644 (file)
--- a/src/black/lines.py
+++ b/src/black/lines.py
@@ -28,7 +28,7 @@ from black.nodes import (
     is_multiline_string,
     is_one_sequence_between,
     is_type_comment,
-    is_with_stmt,
+    is_with_or_async_with_stmt,
     replace_child,
     syms,
     whitespace,
@@ -124,9 +124,9 @@ class Line:
         return bool(self) and is_import(self.leaves[0])
 
     @property
-    def is_with_stmt(self) -> bool:
+    def is_with_or_async_with_stmt(self) -> bool:
         """Is this a with_stmt line?"""
-        return bool(self) and is_with_stmt(self.leaves[0])
+        return bool(self) and is_with_or_async_with_stmt(self.leaves[0])
 
     @property
     def is_class(self) -> bool:
@@ -195,6 +195,26 @@ class Line:
             return False
         return self.leaves[-1].type == token.COLON
 
+    def is_fmt_pass_converted(
+        self, *, first_leaf_matches: Optional[Callable[[Leaf], bool]] = None
+    ) -> bool:
+        """Is this line converted from fmt off/skip code?
+
+        If first_leaf_matches is not None, it only returns True if the first
+        leaf of converted code matches.
+        """
+        if len(self.leaves) != 1:
+            return False
+        leaf = self.leaves[0]
+        if (
+            leaf.type != STANDALONE_COMMENT
+            or leaf.fmt_pass_converted_first_leaf is None
+        ):
+            return False
+        return first_leaf_matches is None or first_leaf_matches(
+            leaf.fmt_pass_converted_first_leaf
+        )
+
     def contains_standalone_comments(self, depth_limit: int = sys.maxsize) -> bool:
         """If so, needs to be split before emitting."""
         for leaf in self.leaves:
@@ -501,7 +521,7 @@ class EmptyLineTracker:
     mode: Mode
     previous_line: Optional[Line] = None
     previous_block: Optional[LinesBlock] = None
-    previous_defs: List[int] = field(default_factory=list)
+    previous_defs: List[Line] = field(default_factory=list)
     semantic_leading_comment: Optional[LinesBlock] = None
 
     def maybe_empty_lines(self, current_line: Line) -> LinesBlock:
@@ -557,12 +577,18 @@ class EmptyLineTracker:
         else:
             before = 0
         depth = current_line.depth
-        while self.previous_defs and self.previous_defs[-1] >= depth:
+        while self.previous_defs and self.previous_defs[-1].depth >= depth:
             if self.mode.is_pyi:
                 assert self.previous_line is not None
                 if depth and not current_line.is_def and self.previous_line.is_def:
                     # Empty lines between attributes and methods should be preserved.
                     before = min(1, before)
+                elif (
+                    Preview.blank_line_after_nested_stub_class in self.mode
+                    and self.previous_defs[-1].is_class
+                    and not self.previous_defs[-1].is_stub_class
+                ):
+                    before = 1
                 elif depth:
                     before = 0
                 else:
@@ -597,6 +623,7 @@ class EmptyLineTracker:
             self.previous_line
             and self.previous_line.is_import
             and not current_line.is_import
+            and not current_line.is_fmt_pass_converted(first_leaf_matches=is_import)
             and depth == self.previous_line.depth
         ):
             return (before or 1), 0
@@ -616,7 +643,7 @@ class EmptyLineTracker:
         self, current_line: Line, before: int
     ) -> Tuple[int, int]:
         if not current_line.is_decorator:
-            self.previous_defs.append(current_line.depth)
+            self.previous_defs.append(current_line)
         if self.previous_line is None:
             # Don't insert empty lines before the first line in the file.
             return 0, 0
@@ -872,7 +899,7 @@ def can_omit_invisible_parens(
         if (
             Preview.wrap_multiple_context_managers_in_parens in line.mode
             and max_priority == COMMA_PRIORITY
-            and rhs.head.is_with_stmt
+            and rhs.head.is_with_or_async_with_stmt
         ):
             # For two context manager with statements, the optional parentheses read
             # better. In this case, `rhs.body` is the context managers part of