[interop][SwiftToCxx] NFC, extract code to remap a property name to its own function

Author: hyp

lib/PrintAsClang/PrintClangFunction.cpp

@@ -504,28 +504,31 @@ void DeclAndTypeClangFunctionPrinter::printCxxMethod(
   os << "  }\n";
 }
 
-void DeclAndTypeClangFunctionPrinter::printCxxPropertyAccessorMethod(
-    const NominalTypeDecl *typeDeclContext, const AccessorDecl *accessor,
-    StringRef swiftSymbolName, Type resultTy, bool isDefinition) {
-  assert(accessor->isSetter() || accessor->getParameters()->size() == 0);
-  os << "  ";
-
+static std::string remapPropertyName(const AccessorDecl *accessor) {
   StringRef propertyName;
   // For a getter or setter, go through the variable or subscript decl.
   propertyName = accessor->getStorage()->getBaseIdentifier().str();
-
   std::string name;
   llvm::raw_string_ostream nameOS(name);
   // FIXME: some names are remapped differently. (e.g. isX).
   nameOS << (accessor->isSetter() ? "set" : "get")
          << char(std::toupper(propertyName[0])) << propertyName.drop_front();
+  nameOS.flush();
+  return name;
+}
+
+void DeclAndTypeClangFunctionPrinter::printCxxPropertyAccessorMethod(
+    const NominalTypeDecl *typeDeclContext, const AccessorDecl *accessor,
+    StringRef swiftSymbolName, Type resultTy, bool isDefinition) {
+  assert(accessor->isSetter() || accessor->getParameters()->size() == 0);
+  os << "  ";
 
   FunctionSignatureModifiers modifiers;
   if (isDefinition)
     modifiers.qualifierContext = typeDeclContext;
   modifiers.isInline = true;
   modifiers.isConst = accessor->isGetter();
-  printFunctionSignature(accessor, nameOS.str(), resultTy,
+  printFunctionSignature(accessor, remapPropertyName(accessor), resultTy,
                          FunctionSignatureKind::CxxInlineThunk, {}, modifiers);
   if (!isDefinition) {
     os << ";\n";