[clang-format] Parse JSON outermost l_brace as braced list brace (#143327)

See
llvm/llvm-project#65400 (comment).

Author: owenca

clang/lib/Format/ContinuationIndenter.cpp

@@ -2248,7 +2248,6 @@ unsigned ContinuationIndenter::reformatRawStringLiteral(
       /*Status=*/nullptr);
 
   auto NewCode = applyAllReplacements(RawText, Fixes.first);
-  tooling::Replacements NoFixes;
   if (!NewCode)
     return addMultilineToken(Current, State);
   if (!DryRun) {

clang/lib/Format/UnwrappedLineParser.cpp

@@ -269,7 +269,7 @@ void UnwrappedLineParser::parseFile() {
   bool MustBeDeclaration = !Line->InPPDirective && !Style.isJavaScript();
   ScopedDeclarationState DeclarationState(*Line, DeclarationScopeStack,
                                           MustBeDeclaration);
-  if (Style.isTextProto())
+  if (Style.isTextProto() || (Style.isJson() && FormatTok->IsFirst))
     parseBracedList();
   else
     parseLevel();

clang/unittests/Format/FormatTestRawStrings.cpp

@@ -1002,9 +1002,11 @@ TEST_F(FormatTestRawStrings, Json) {
   };
 
   EXPECT_EQ("json = R\"json({\n"
+            "                \"foo\": \"bar\",\n"
             "                \"str\": \"test\"\n"
             "              })json\";",
             format("json = R\"json({\n"
+                   "  \"foo\": \"bar\",\n"
                    "  \"str\": \"test\"\n"
                    "})json\";",
                    Style));

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -4105,6 +4105,20 @@ TEST_F(TokenAnnotatorTest, BitFieldColon) {
   EXPECT_TOKEN(Tokens[5], tok::colon, TT_BitFieldColon);
 }
 
+TEST_F(TokenAnnotatorTest, JsonCodeInRawString) {
+  auto Tokens = annotate("{\n"
+                         "  \"foo\": \"bar\",\n"
+                         "  \"str\": \"test\"\n"
+                         "}",
+                         getLLVMStyle(FormatStyle::LK_Json));
+  ASSERT_EQ(Tokens.size(), 10u) << Tokens;
+  EXPECT_TOKEN(Tokens[0], tok::l_brace, TT_DictLiteral);
+  EXPECT_TOKEN(Tokens[1], tok::string_literal, TT_SelectorName);
+  EXPECT_TOKEN(Tokens[2], tok::colon, TT_DictLiteral);
+  EXPECT_TOKEN(Tokens[5], tok::string_literal, TT_SelectorName);
+  EXPECT_TOKEN(Tokens[6], tok::colon, TT_DictLiteral);
+}
+
 } // namespace
 } // namespace format
 } // namespace clang