clang-format: Improve braced init list detection:

Before:
  std::this_thread::sleep_for(std::chrono::nanoseconds{
    std::chrono::seconds { 1 }
  } /
                              5);

After:
  std::this_thread::sleep_for(
      std::chrono::nanoseconds{ std::chrono::seconds{ 1 } } / 5);

This fixes llvm.org/PR16554.

llvm-svn: 189451

clang/lib/Format/UnwrappedLineParser.cpp

@@ -284,8 +284,12 @@ void UnwrappedLineParser::calculateBraceTypes() {
           // Thus, if the parent is a braced init list, we consider all
           // brace blocks inside it braced init list. That works good enough
           // for now, but we will need to fix it to correctly handle lambdas.
+          //
+          // We exclude + and - as they can be ObjC visibility modifiers.
           if (NextTok->isOneOf(tok::comma, tok::semi, tok::r_paren,
-                               tok::l_brace, tok::colon)) {
+                               tok::l_brace, tok::colon) ||
+              (NextTok->isBinaryOperator() &&
+               !NextTok->isOneOf(tok::plus, tok::minus))) {
             Tok->BlockKind = BK_BracedInit;
             LBraceStack.back()->BlockKind = BK_BracedInit;
           } else {

clang/unittests/Format/FormatTest.cpp

@@ -4159,6 +4159,9 @@ TEST_F(FormatTest, LayoutCxx11ConstructorBraceInitializers) {
         "                           // comment 2\n"
         "                           param3, param4\n"
         "                         });");
+    verifyFormat(
+        "std::this_thread::sleep_for(\n"
+        "    std::chrono::nanoseconds{ std::chrono::seconds{ 1 } } / 5);");
 
     FormatStyle NoSpaces = getLLVMStyle();
     NoSpaces.Cpp11BracedListStyle = true;