Move the two bools for EmitComment to a flags enum

Makes call sites easier to ready and should make things safer
if this ever needs some other support in the future.

PiperOrigin-RevId: 547284873

Author: thomasvl

src/google/protobuf/compiler/objectivec/enum.cc

@@ -105,8 +105,7 @@ void EnumGenerator::GenerateHeader(io::Printer* printer) const {
   printer->Emit(
       {
           {"enum_name", name_},
-          {"enum_comments",
-           [&] { EmitCommentsString(printer, descriptor_, true); }},
+          {"enum_comments", [&] { EmitCommentsString(printer, descriptor_); }},
           {"enum_deprecated_attribute",
            GetOptionalDeprecatedAttribute(descriptor_, descriptor_->file())},
           {"maybe_unknown_value",
@@ -125,17 +124,14 @@ void EnumGenerator::GenerateHeader(io::Printer* printer) const {
            }},
           {"enum_values",
            [&] {
-             bool add_leading_newilne = false;
+             CommentStringFlags comment_flags = CommentStringFlags::kNone;
              for (const auto* v : all_values_) {
                if (alias_values_to_skip_.contains(v)) continue;
                printer->Emit(
                    {
                        {"name", EnumValueName(v)},
                        {"comments",
-                        [&] {
-                          EmitCommentsString(printer, v, true,
-                                             add_leading_newilne);
-                        }},
+                        [&] { EmitCommentsString(printer, v, comment_flags); }},
                        {"deprecated_attribute",
                         GetOptionalDeprecatedAttribute(v)},
                        {"value", SafelyPrintIntToCode(v->number())},
@@ -145,7 +141,7 @@ void EnumGenerator::GenerateHeader(io::Printer* printer) const {
                      $comments$
                      $name$$deprecated_attribute$ = $value$,
                    )objc");
-               add_leading_newilne = true;
+               comment_flags = CommentStringFlags::kAddLeadingNewline;
              }
            }},
       },

src/google/protobuf/compiler/objectivec/extension.cc

@@ -60,7 +60,7 @@ ExtensionGenerator::ExtensionGenerator(
 void ExtensionGenerator::GenerateMembersHeader(io::Printer* printer) const {
   printer->Emit(
       {{"method_name", method_name_},
-       {"comments", [&] { EmitCommentsString(printer, descriptor_, true); }},
+       {"comments", [&] { EmitCommentsString(printer, descriptor_); }},
        {"storage_attribute",
         IsRetainedName(method_name_) ? "NS_RETURNS_NOT_RETAINED" : ""},
        {"deprecated_attribute",

src/google/protobuf/compiler/objectivec/field.cc

@@ -313,7 +313,7 @@ void SingleFieldGenerator::GeneratePropertyDeclaration(
     io::Printer* printer) const {
   auto vars = printer->WithVars(variables_);
   printer->Emit(
-      {{"comments", [&] { EmitCommentsString(printer, descriptor_, true); }}},
+      {{"comments", [&] { EmitCommentsString(printer, descriptor_); }}},
       R"objc(
         $comments$
         @property(nonatomic, readwrite) $property_type$ $name$$deprecated_attribute$;
@@ -366,7 +366,7 @@ void ObjCObjFieldGenerator::GeneratePropertyDeclaration(
 
   auto vars = printer->WithVars(variables_);
   printer->Emit(
-      {{"comments", [&] { EmitCommentsString(printer, descriptor_, true); }}},
+      {{"comments", [&] { EmitCommentsString(printer, descriptor_); }}},
       R"objc(
         $comments$
         @property(nonatomic, readwrite, $property_storage_attribute$, null_resettable) $property_type$ *$name$$storage_attribute$$deprecated_attribute$;
@@ -420,7 +420,7 @@ void RepeatedFieldGenerator::GeneratePropertyDeclaration(
 
   auto vars = printer->WithVars(variables_);
   printer->Emit(
-      {{"comments", [&] { EmitCommentsString(printer, descriptor_, true); }},
+      {{"comments", [&] { EmitCommentsString(printer, descriptor_); }},
        {"array_comment", [&] { EmitArrayComment(printer); }}},
       R"objc(
         $comments$

src/google/protobuf/compiler/objectivec/helpers.cc

@@ -342,7 +342,7 @@ std::string ObjCClassDeclaration(absl::string_view class_name) {
 }
 
 void EmitCommentsString(io::Printer* printer, const SourceLocation& location,
-                        bool prefer_single_line, bool add_leading_newilne) {
+                        CommentStringFlags flags) {
   absl::string_view comments = location.leading_comments.empty()
                                    ? location.trailing_comments
                                    : location.leading_comments;
@@ -375,11 +375,11 @@ void EmitCommentsString(io::Printer* printer, const SourceLocation& location,
          {"*/", "*\\/"}}));
   }
 
-  if (add_leading_newilne) {
+  if (flags & CommentStringFlags::kAddLeadingNewline) {
     printer->Emit("\n");
   }
 
-  if (prefer_single_line && lines.size() == 1) {
+  if ((flags & CommentStringFlags::kForceMultiline) == 0 && lines.size() == 1) {
     printer->Emit({{"text", lines[0]}}, R"(
       /** $text$ */
     )");

src/google/protobuf/compiler/objectivec/helpers.h

@@ -112,21 +112,26 @@ std::string ObjCClass(absl::string_view class_name);
 // be referred to by ObjCClass.
 std::string ObjCClassDeclaration(absl::string_view class_name);
 
+// Flag to control the behavior of `EmitCommentsString`.
+enum CommentStringFlags : unsigned int {
+  kNone = 0,
+  kAddLeadingNewline = 1 << 1,  // Add a newline before the comment.
+  kForceMultiline = 1 << 2,  // Force a multiline comment even if only 1 line.
+};
+
 // Emits HeaderDoc/appledoc style comments out of the comments in the .proto
 // file.
 void EmitCommentsString(io::Printer* printer, const SourceLocation& location,
-                        bool prefer_single_line, bool add_leading_newilne);
+                        CommentStringFlags flags = kNone);
 
 // Emits HeaderDoc/appledoc style comments out of the comments in the .proto
 // file.
 template <class TDescriptor>
 void EmitCommentsString(io::Printer* printer, const TDescriptor* descriptor,
-                        bool prefer_single_line,
-                        bool add_leading_newilne = false) {
+                        CommentStringFlags flags = kNone) {
   SourceLocation location;
   if (descriptor->GetSourceLocation(&location)) {
-    EmitCommentsString(printer, location, prefer_single_line,
-                       add_leading_newilne);
+    EmitCommentsString(printer, location, flags);
   }
 }
 

src/google/protobuf/compiler/objectivec/message.cc

@@ -306,7 +306,10 @@ void MessageGenerator::GenerateMessageHeader(io::Printer* printer) const {
   printer->Emit(
       {{"deprecated_attribute", deprecated_attribute_},
        {"message_comments",
-        [&] { EmitCommentsString(printer, descriptor_, false); }},
+        [&] {
+          EmitCommentsString(printer, descriptor_,
+                             CommentStringFlags::kForceMultiline);
+        }},
        {"message_fieldnum_enum",
         [&] {
           if (descriptor_->field_count() == 0) return;

src/google/protobuf/compiler/objectivec/oneof.cc

@@ -85,7 +85,7 @@ void OneofGenerator::GeneratePublicCasePropertyDeclaration(
     io::Printer* printer) const {
   auto vars = printer->WithVars(variables_);
   printer->Emit(
-      {{"comments", [&] { EmitCommentsString(printer, descriptor_, true); }}},
+      {{"comments", [&] { EmitCommentsString(printer, descriptor_); }}},
       R"objc(
         $comments$;
         @property(nonatomic, readonly) $enum_name$ $name$OneOfCase;