X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/21218b666aeafd1c089cbe998e730f97605d25b2..27932494bcefac03497dd92dcf0c59a04c10d757:/src/black/trans.py

diff --git a/src/black/trans.py b/src/black/trans.py
index 9e0284c..8893ab0 100644
--- a/src/black/trans.py
+++ b/src/black/trans.py
@@ -1043,6 +1043,37 @@ class BaseStringSplitter(StringTransformer):
         max_string_length = self.line_length - offset
         return max_string_length
 
+    @staticmethod
+    def _prefer_paren_wrap_match(LL: List[Leaf]) -> Optional[int]:
+        """
+        Returns:
+            string_idx such that @LL[string_idx] is equal to our target (i.e.
+            matched) string, if this line matches the "prefer paren wrap" statement
+            requirements listed in the 'Requirements' section of the StringParenWrapper
+            class's docstring.
+                OR
+            None, otherwise.
+        """
+        # The line must start with a string.
+        if LL[0].type != token.STRING:
+            return None
+
+        # If the string is surrounded by commas (or is the first/last child)...
+        prev_sibling = LL[0].prev_sibling
+        next_sibling = LL[0].next_sibling
+        if not prev_sibling and not next_sibling and parent_type(LL[0]) == syms.atom:
+            # If it's an atom string, we need to check the parent atom's siblings.
+            parent = LL[0].parent
+            assert parent is not None  # For type checkers.
+            prev_sibling = parent.prev_sibling
+            next_sibling = parent.next_sibling
+        if (not prev_sibling or prev_sibling.type == token.COMMA) and (
+            not next_sibling or next_sibling.type == token.COMMA
+        ):
+            return 0
+
+        return None
+
 
 def iter_fexpr_spans(s: str) -> Iterator[Tuple[int, int]]:
     """
@@ -1138,6 +1169,9 @@ class StringSplitter(BaseStringSplitter, CustomSplitMapMixin):
     def do_splitter_match(self, line: Line) -> TMatchResult:
         LL = line.leaves
 
+        if self._prefer_paren_wrap_match(LL) is not None:
+            return TErr("Line needs to be wrapped in parens first.")
+
         is_valid_index = is_valid_index_factory(LL)
 
         idx = 0
@@ -1208,7 +1242,7 @@ class StringSplitter(BaseStringSplitter, CustomSplitMapMixin):
 
         string_op_leaves = self._get_string_operator_leaves(LL)
         string_op_leaves_length = (
-            sum([len(str(prefix_leaf)) for prefix_leaf in string_op_leaves]) + 1
+            sum(len(str(prefix_leaf)) for prefix_leaf in string_op_leaves) + 1
             if string_op_leaves
             else 0
         )
@@ -1583,8 +1617,7 @@ class StringSplitter(BaseStringSplitter, CustomSplitMapMixin):
 
 class StringParenWrapper(BaseStringSplitter, CustomSplitMapMixin):
     """
-    StringTransformer that splits non-"atom" strings (i.e. strings that do not
-    exist on lines by themselves).
+    StringTransformer that wraps strings in parens and then splits at the LPAR.
 
     Requirements:
         All of the requirements listed in BaseStringSplitter's docstring in
@@ -1604,6 +1637,10 @@ class StringParenWrapper(BaseStringSplitter, CustomSplitMapMixin):
             OR
         * The line is a dictionary key assignment where some valid key is being
         assigned the value of some string.
+            OR
+        * The line starts with an "atom" string that prefers to be wrapped in
+        parens. It's preferred to be wrapped when the string is surrounded by
+        commas (or is the first/last child).
 
     Transformations:
         The chosen string is wrapped in parentheses and then split at the LPAR.
@@ -1628,6 +1665,9 @@ class StringParenWrapper(BaseStringSplitter, CustomSplitMapMixin):
         changed such that it no longer needs to be given its own line,
         StringParenWrapper relies on StringParenStripper to clean up the
         parentheses it created.
+
+        For "atom" strings that prefers to be wrapped in parens, it requires
+        StringSplitter to hold the split until the string is wrapped in parens.
     """
 
     def do_splitter_match(self, line: Line) -> TMatchResult:
@@ -1644,6 +1684,7 @@ class StringParenWrapper(BaseStringSplitter, CustomSplitMapMixin):
             or self._assert_match(LL)
             or self._assign_match(LL)
             or self._dict_match(LL)
+            or self._prefer_paren_wrap_match(LL)
         )
 
         if string_idx is not None: