[clang-format] Change BracedInitializerIndentWidth to int (#128988)

Fixes #108526

Author: owenca

clang/docs/ClangFormatStyleOptions.rst

@@ -2582,9 +2582,9 @@ the configuration (without a prefix: ``Auto``).
 
 .. _BracedInitializerIndentWidth:
 
-**BracedInitializerIndentWidth** (``Unsigned``) :versionbadge:`clang-format 17` :ref:`¶ <BracedInitializerIndentWidth>`
+**BracedInitializerIndentWidth** (``Integer``) :versionbadge:`clang-format 17` :ref:`¶ <BracedInitializerIndentWidth>`
   The number of columns to use to indent the contents of braced init lists.
-  If unset, ``ContinuationIndentWidth`` is used.
+  If unset or negative, ``ContinuationIndentWidth`` is used.
 
   .. code-block:: c++
 

clang/include/clang/Format/Format.h

@@ -1289,7 +1289,7 @@ struct FormatStyle {
   BitFieldColonSpacingStyle BitFieldColonSpacing;
 
   /// The number of columns to use to indent the contents of braced init lists.
-  /// If unset, ``ContinuationIndentWidth`` is used.
+  /// If unset or negative, ``ContinuationIndentWidth`` is used.
   /// \code
   ///   AlignAfterOpenBracket: AlwaysBreak
   ///   BracedInitializerIndentWidth: 2
@@ -1319,7 +1319,7 @@ struct FormatStyle {
   ///   }
   /// \endcode
   /// \version 17
-  std::optional<unsigned> BracedInitializerIndentWidth;
+  int BracedInitializerIndentWidth;
 
   /// Different ways to wrap braces after control statements.
   enum BraceWrappingAfterControlStatementStyle : int8_t {

clang/lib/Format/ContinuationIndenter.cpp

@@ -1921,9 +1921,9 @@ void ContinuationIndenter::moveStatePastScopeOpener(LineState &State,
       NewIndent = Style.IndentWidth +
                   std::min(State.Column, CurrentState.NestedBlockIndent);
     } else if (Current.is(tok::l_brace)) {
-      NewIndent =
-          CurrentState.LastSpace + Style.BracedInitializerIndentWidth.value_or(
-                                       Style.ContinuationIndentWidth);
+      const auto Width = Style.BracedInitializerIndentWidth;
+      NewIndent = CurrentState.LastSpace +
+                  (Width < 0 ? Style.ContinuationIndentWidth : Width);
     } else {
       NewIndent = CurrentState.LastSpace + Style.ContinuationIndentWidth;
     }

clang/lib/Format/Format.cpp

@@ -1512,7 +1512,7 @@ FormatStyle getLLVMStyle(FormatStyle::LanguageKind Language) {
   LLVMStyle.BinPackLongBracedList = true;
   LLVMStyle.BinPackParameters = FormatStyle::BPPS_BinPack;
   LLVMStyle.BitFieldColonSpacing = FormatStyle::BFCS_Both;
-  LLVMStyle.BracedInitializerIndentWidth = std::nullopt;
+  LLVMStyle.BracedInitializerIndentWidth = -1;
   LLVMStyle.BraceWrapping = {/*AfterCaseLabel=*/false,
                              /*AfterClass=*/false,
                              /*AfterControlStatement=*/FormatStyle::BWACS_Never,

clang/unittests/Format/ConfigParseTest.cpp

@@ -265,9 +265,9 @@ TEST(ConfigParseTest, ParsesConfigurationIntegers) {
   Style.Language = FormatStyle::LK_Cpp;
 
   CHECK_PARSE_INT(AccessModifierOffset);
+  CHECK_PARSE_INT(BracedInitializerIndentWidth);
   CHECK_PARSE_INT(PPIndentWidth);
 
-  CHECK_PARSE_UNSIGNED(BracedInitializerIndentWidth);
   CHECK_PARSE_UNSIGNED(ColumnLimit);
   CHECK_PARSE_UNSIGNED(ConstructorInitializerIndentWidth);
   CHECK_PARSE_UNSIGNED(ContinuationIndentWidth);
@@ -1441,8 +1441,10 @@ TEST(ConfigParseTest, GetStyleOfFile) {
   ASSERT_EQ(*Style9, SubSubStyle);
 
   // Test 9.8: use inheritance from a file without BasedOnStyle
-  ASSERT_TRUE(FS.addFile("/e/withoutbase/.clang-format", 0,
-                         llvm::MemoryBuffer::getMemBuffer("ColumnLimit: 123")));
+  ASSERT_TRUE(FS.addFile(
+      "/e/withoutbase/.clang-format", 0,
+      llvm::MemoryBuffer::getMemBuffer("BracedInitializerIndentWidth: 2\n"
+                                       "ColumnLimit: 123")));
   ASSERT_TRUE(
       FS.addFile("/e/withoutbase/sub/.clang-format", 0,
                  llvm::MemoryBuffer::getMemBuffer(
@@ -1452,6 +1454,7 @@ TEST(ConfigParseTest, GetStyleOfFile) {
   ASSERT_TRUE(static_cast<bool>(Style9));
   ASSERT_EQ(*Style9, [] {
     auto Style = getLLVMStyle();
+    Style.BracedInitializerIndentWidth = 2;
     Style.ColumnLimit = 123;
     return Style;
   }());
@@ -1460,6 +1463,7 @@ TEST(ConfigParseTest, GetStyleOfFile) {
   ASSERT_TRUE(static_cast<bool>(Style9));
   ASSERT_EQ(*Style9, [] {
     auto Style = getLLVMStyle();
+    Style.BracedInitializerIndentWidth = 2;
     Style.ColumnLimit = 123;
     Style.IndentWidth = 7;
     return Style;