[clang-format] Adjust braced list detection

This avoids mishandling nested compound statements that are followed by another compound statement.

Fixes https://llvm.org/PR38314 and https://llvm.org/PR48305.

Differential Revision: https://reviews.llvm.org/D114583

clang/lib/Format/UnwrappedLineParser.cpp

@@ -578,17 +578,14 @@ void UnwrappedLineParser::calculateBraceTypes(bool ExpectClassBody) {
           // BlockKind later if we parse a braced list (where all blocks
           // inside are by default braced lists), or when we explicitly detect
           // blocks (for example while parsing lambdas).
-          // FIXME: Some of these do not apply to JS, e.g. "} {" can never be a
-          // braced list in JS.
           ProbablyBracedList =
               (Style.Language == FormatStyle::LK_JavaScript &&
                NextTok->isOneOf(Keywords.kw_of, Keywords.kw_in,
                                 Keywords.kw_as)) ||
               (Style.isCpp() && NextTok->is(tok::l_paren)) ||
               NextTok->isOneOf(tok::comma, tok::period, tok::colon,
-                               tok::r_paren, tok::r_square, tok::l_brace,
-                               tok::ellipsis) ||
-              (NextTok->is(tok::identifier) &&
+                               tok::r_paren, tok::r_square, tok::ellipsis) ||
+              (NextTok->isOneOf(tok::l_brace, tok::identifier) &&
                !PrevTok->isOneOf(tok::semi, tok::r_brace, tok::l_brace)) ||
               (NextTok->is(tok::semi) &&
                (!ExpectClassBody || LBraceStack.size() != 1)) ||
@@ -2856,7 +2853,7 @@ void UnwrappedLineParser::parseRecord(bool ParseAsExpr) {
       //     class Foo implements {bar: number} { }
       nextToken();
       if (FormatTok->is(tok::l_brace)) {
-        tryToParseBracedList();
+        parseBracedList();
         continue;
       }
     }

clang/unittests/Format/FormatTest.cpp

@@ -11773,6 +11773,27 @@ TEST_F(FormatTest, FormatsBracedListsInColumnLayout) {
                "  f(v);\n"
                "}");
 
+  verifyFormat("void foo() {\n"
+               "  { // asdf\n"
+               "    { int a; }\n"
+               "  }\n"
+               "  {\n"
+               "    { int b; }\n"
+               "  }\n"
+               "}");
+  verifyFormat("namespace n {\n"
+               "void foo() {\n"
+               "  {\n"
+               "    {\n"
+               "      statement();\n"
+               "      if (false) {\n"
+               "      }\n"
+               "    }\n"
+               "  }\n"
+               "  {}\n"
+               "}\n"
+               "} // namespace n");
+
   // Long lists should be formatted in columns even if they are nested.
   verifyFormat(
       "vector<int> x = function({1, 22, 333, 4444, 55555, 666666, 7777777,\n"