Move namespace helpers into the public part of names.h

PiperOrigin-RevId: 485978369

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

@@ -403,6 +403,7 @@ std::string Namespace(const std::string& package) {
   return "::" + DotsToColons(package);
 }
 
+std::string Namespace(const FileDescriptor* d) { return Namespace(d, {}); }
 std::string Namespace(const FileDescriptor* d, const Options& options) {
   std::string ns = Namespace(d->package());
   if (IsWellKnownMessage(d) && options.opensource_runtime) {
@@ -418,14 +419,17 @@ std::string Namespace(const FileDescriptor* d, const Options& options) {
   return ns;
 }
 
+std::string Namespace(const Descriptor* d) { return Namespace(d, {}); }
 std::string Namespace(const Descriptor* d, const Options& options) {
   return Namespace(d->file(), options);
 }
 
+std::string Namespace(const FieldDescriptor* d) { return Namespace(d, {}); }
 std::string Namespace(const FieldDescriptor* d, const Options& options) {
   return Namespace(d->file(), options);
 }
 
+std::string Namespace(const EnumDescriptor* d) { return Namespace(d, {}); }
 std::string Namespace(const EnumDescriptor* d, const Options& options) {
   return Namespace(d->file(), options);
 }

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

@@ -116,6 +116,10 @@ std::string Namespace(const FileDescriptor* d, const Options& options);
 std::string Namespace(const Descriptor* d, const Options& options);
 std::string Namespace(const FieldDescriptor* d, const Options& options);
 std::string Namespace(const EnumDescriptor* d, const Options& options);
+std::string Namespace(const FileDescriptor* d);
+std::string Namespace(const Descriptor* d);
+std::string Namespace(const FieldDescriptor* d);
+std::string Namespace(const EnumDescriptor* d);
 
 // Returns true if it's safe to reset "field" to zero.
 bool CanInitializeByZeroing(const FieldDescriptor* field);

src/google/protobuf/compiler/cpp/names.h

@@ -43,10 +43,23 @@ class Descriptor;
 class EnumDescriptor;
 class EnumValueDescriptor;
 class FieldDescriptor;
+class FileDescriptor;
 
 namespace compiler {
 namespace cpp {
 
+// Returns the fully qualified C++ namespace.
+//
+// For example, if you had:
+//   package foo.bar;
+//   message Baz { message Moo {} }
+// Then the qualified namespace for Moo would be:
+//   ::foo::bar
+std::string Namespace(const FileDescriptor* d);
+std::string Namespace(const Descriptor* d);
+std::string Namespace(const FieldDescriptor* d);
+std::string Namespace(const EnumDescriptor* d);
+
 // Returns the unqualified C++ name.
 //
 // For example, if you had: