Move to explicitly creating a new loop (#3164)

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

diff --git a/src/black/lines.py b/src/black/lines.py
index f35665c8e0c5afa0eba3d0385c4153609e13c8f6..8b591c324a5da6a27fc7fb7613f2900df2da9b7b 100644 (file)
--- a/src/black/lines.py
+++ b/src/black/lines.py
@@ -17,12 +17,12 @@ from blib2to3.pytree import Node, Leaf
 from blib2to3.pgen2 import token
 
 from black.brackets import BracketTracker, DOT_PRIORITY
-from black.mode import Mode
+from black.mode import Mode, Preview
 from black.nodes import STANDALONE_COMMENT, TEST_DESCENDANTS
 from black.nodes import BRACKETS, OPENING_BRACKETS, CLOSING_BRACKETS
 from black.nodes import syms, whitespace, replace_child, child_towards
 from black.nodes import is_multiline_string, is_import, is_type_comment
-from black.nodes import is_one_tuple_between
+from black.nodes import is_one_sequence_between
 
 # types
 T = TypeVar("T")
@@ -168,6 +168,13 @@ class Line:
             and self.leaves[0].value.startswith(('"""', "'''"))
         )
 
+    @property
+    def opens_block(self) -> bool:
+        """Does this line open a new level of indentation."""
+        if len(self.leaves) == 0:
+            return False
+        return self.leaves[-1].type == token.COLON
+
     def contains_standalone_comments(self, depth_limit: int = sys.maxsize) -> bool:
         """If so, needs to be split before emitting."""
         for leaf in self.leaves:
@@ -254,6 +261,7 @@ class Line:
         """Return True if we have a magic trailing comma, that is when:
         - there's a trailing comma here
         - it's not a one-tuple
+        - it's not a single-element subscript
         Additionally, if ensure_removable:
         - it's not from square bracket indexing
         """
@@ -268,6 +276,20 @@ class Line:
             return True
 
         if closing.type == token.RSQB:
+            if (
+                Preview.one_element_subscript in self.mode
+                and closing.parent
+                and closing.parent.type == syms.trailer
+                and closing.opening_bracket
+                and is_one_sequence_between(
+                    closing.opening_bracket,
+                    closing,
+                    self.leaves,
+                    brackets=(token.LSQB, token.RSQB),
+                )
+            ):
+                return False
+
             if not ensure_removable:
                 return True
             comma = self.leaves[-1]
@@ -276,7 +298,7 @@ class Line:
         if self.is_import:
             return True
 
-        if closing.opening_bracket is not None and not is_one_tuple_between(
+        if closing.opening_bracket is not None and not is_one_sequence_between(
             closing.opening_bracket, closing, self.leaves
         ):
             return True
@@ -498,6 +520,12 @@ class EmptyLineTracker:
         ):
             return before, 1
 
+        if (
+            Preview.remove_block_trailing_newline in current_line.mode
+            and self.previous_line
+            and self.previous_line.opens_block
+        ):
+            return 0, 0
         return before, 0
 
     def _maybe_empty_lines_for_class_or_def(