[FIX] migrate-black.py: don't fail on binary files (#3266)

[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
 
         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]]:
     """
 
 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
 
     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
         is_valid_index = is_valid_index_factory(LL)
 
         idx = 0


@@ -1583,8 +1621,7 @@ class StringSplitter(BaseStringSplitter, CustomSplitMapMixin):
 
 class StringParenWrapper(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
 
     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 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.
 
     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.
         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:
     """
 
     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._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:
         )
 
         if string_idx is not None: