Add parens around implicit string concatenations where it increases readability ...

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

diff --git a/src/black/trans.py b/src/black/trans.py
index 9e0284cefe3735b04b4b9ae472e4797d1ea4cb83..7ecfcef703d26e4ae9963254c4963c8561103d8e 100644 (file)
--- a/src/black/trans.py
+++ b/src/black/trans.py
@@ -1043,6 +1043,41 @@ 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
+
+        matching_nodes = [
+            syms.listmaker,
+            syms.dictsetmaker,
+            syms.testlist_gexp,
+        ]
+        # If the string is an immediate child of a list/set/tuple literal...
+        if (
+            parent_type(LL[0]) in matching_nodes
+            or parent_type(LL[0].parent) in matching_nodes
+        ):
+            # And 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 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 +1173,9 @@ 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
@@ -1583,8 +1621,7 @@ 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 +1641,11 @@ 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 it's is an immediate child of
+        a list/set/tuple literal, AND 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 +1670,9 @@ 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 +1689,7 @@ 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: