Hide GOOGLE_PROTOBUF_VERSION in port/

Our internal build does not define GOOGLE_PROTOBUF_VERSION.

port/protobuf.h

diff --git a/port/protobuf.h b/port/protobuf.h
index 4acba09..8e9a44b 100644
--- a/port/protobuf.h
+++ b/port/protobuf.h
@@ -60,6 +60,51 @@
 
 namespace protobuf = google::protobuf;
 
+inline bool RequiresUtf8Validation(
+    const google::protobuf::FieldDescriptor& descriptor) {
+  // commit d8c2501b43c1b56e3efa74048a18f8ce06ba07fe of >= v3.22.0
+#if GOOGLE_PROTOBUF_VERSION >= 4022000
+  return descriptor.requires_utf8_validation();
+#else
+  return descriptor.type() == google::protobuf::FieldDescriptor::TYPE_STRING &&
+         descriptor.file()->syntax() ==
+             google::protobuf::FileDescriptor::SYNTAX_PROTO3;
+#endif
+}
+
+inline bool HasPresence(const google::protobuf::FieldDescriptor& descriptor) {
+  // commit bb30225f06c36399757dc698b409d5f79738e8d1 of >=3.12.0
+#if GOOGLE_PROTOBUF_VERSION >= 3012000
+  return descriptor.has_presence();
+#else
+  // NOTE: This mimics Protobuf 3.21.12 ("3021012")
+  return !descriptor.is_repeated() &&
+         (descriptor.cpp_type() ==
+              google::protobuf::FieldDescriptor::CppType::CPPTYPE_MESSAGE ||
+          descriptor.containing_oneof() ||
+          descriptor.file()->syntax() ==
+              google::protobuf::FileDescriptor::SYNTAX_PROTO2);
+#endif
+}
+
+inline void PrepareTextParser(google::protobuf::TextFormat::Parser& parser) {
+  // commit d8c2501b43c1b56e3efa74048a18f8ce06ba07fe of >=3.8.0
+#if GOOGLE_PROTOBUF_VERSION >= 3008000
+  parser.SetRecursionLimit(100);
+  parser.AllowUnknownField(true);
+#endif
+}
+
+constexpr bool TextParserCanSetRecursionLimit() {
+  // commit d8c2501b43c1b56e3efa74048a18f8ce06ba07fe of >=3.8.0
+  return GOOGLE_PROTOBUF_VERSION >= 3008000;
+}
+
+constexpr bool TextParserCanAllowUnknownField() {
+  // commit 176f7db11d8242b36a3ea6abb1cc436fca5bf75d of >=3.8.0
+  return GOOGLE_PROTOBUF_VERSION >= 3008000;
+}
+
 }  // namespace protobuf_mutator
 
 #endif  // PORT_PROTOBUF_H_

src/field_instance.h

diff --git a/src/field_instance.h b/src/field_instance.h
index 25dc2c6..5b0df7f 100644
--- a/src/field_instance.h
+++ b/src/field_instance.h
@@ -190,15 +190,7 @@
     return descriptor_->message_type();
   }
 
-  bool EnforceUtf8() const {
-#if GOOGLE_PROTOBUF_VERSION >= 4022000  // v3(!).22.0 (commit d85c9944c55fb38f4eae149979a0f680ea125ecb) for requires_utf8_validation
-    return descriptor_->requires_utf8_validation();
-#else
-    return descriptor_->type() == protobuf::FieldDescriptor::TYPE_STRING &&
-           descriptor()->file()->syntax() ==
-               protobuf::FileDescriptor::SYNTAX_PROTO3;
-#endif
-  }
+  bool EnforceUtf8() const { return RequiresUtf8Validation(*descriptor_); }
 
   const protobuf::FieldDescriptor* descriptor() const { return descriptor_; }
 

src/mutator.cc

diff --git a/src/mutator.cc b/src/mutator.cc
index 415655b..c8a4294 100644
--- a/src/mutator.cc
+++ b/src/mutator.cc
@@ -87,17 +87,7 @@
 }
 
 bool IsProto3SimpleField(const FieldDescriptor& field) {
-#if GOOGLE_PROTOBUF_VERSION >= 3012000 // commit bb30225f06c36399757dc698b409d5f79738e8d1 of >=3.12.0
-  const bool has_presence = field.has_presence();
-#else
-  // NOTE: This mimics Protobuf 3.21.12 ("3021012")
-  const bool has_presence = ! field.is_repeated() && (
-    field.cpp_type() == FieldDescriptor::CppType::CPPTYPE_MESSAGE
-    || field.containing_oneof()
-    || field.file()->syntax() == FileDescriptor::SYNTAX_PROTO2
-  );
-#endif
-  return !field.is_repeated() && !has_presence;
+  return !field.is_repeated() && !HasPresence(field);
 }
 
 struct CreateDefaultField : public FieldFunction<CreateDefaultField> {
@@ -390,23 +380,13 @@
 }
 
 const Any* CastToAny(const Message* message) {
-#if GOOGLE_PROTOBUF_VERSION >= 3008000  // commit 1467e08d7c26a7087e5e5b14a4ab2755926e7249 of >=3.8.0
-  const Descriptor* any_descriptor = Any::GetDescriptor();
-#else
-  const Descriptor* any_descriptor = Any::descriptor();
-#endif
-  return any_descriptor == message->GetDescriptor()
+  return Any::descriptor() == message->GetDescriptor()
              ? protobuf::DownCastMessage<Any>(message)
              : nullptr;
 }
 
 Any* CastToAny(Message* message) {
-#if GOOGLE_PROTOBUF_VERSION >= 3008000  // commit 1467e08d7c26a7087e5e5b14a4ab2755926e7249 of >=3.8.0
-  const Descriptor* any_descriptor = Any::GetDescriptor();
-#else
-  const Descriptor* any_descriptor = Any::descriptor();
-#endif
-  return any_descriptor == message->GetDescriptor()
+  return Any::descriptor() == message->GetDescriptor()
              ? protobuf::DownCastMessage<Any>(message)
              : nullptr;
 }

src/mutator_test.cc

diff --git a/src/mutator_test.cc b/src/mutator_test.cc
index b1610f6..76e1da9 100644
--- a/src/mutator_test.cc
+++ b/src/mutator_test.cc
@@ -678,18 +678,16 @@
 }
 
 TYPED_TEST(MutatorTypedTest, UnknownFieldTextFormat) {
-#if GOOGLE_PROTOBUF_VERSION < 3008000  // commit 176f7db11d8242b36a3ea6abb1cc436fca5bf75d of >=3.8.0
-  GTEST_SKIP() << "TextFormat::Parser::AllowUnknownField() is not available";
-#endif  // GOOGLE_PROTOBUF_VERSION
+  if (!TextParserCanAllowUnknownField())
+    GTEST_SKIP() << "TextFormat::Parser::AllowUnknownField() is not available";
   typename TestFixture::Message parsed;
   EXPECT_TRUE(ParseTextMessage(kUnknownFieldInput, &parsed));
   EXPECT_EQ(SaveMessageAsText(parsed), kUnknownFieldExpected);
 }
 
 TYPED_TEST(MutatorTypedTest, DeepRecursion) {
-#if GOOGLE_PROTOBUF_VERSION < 3008000  // commit d8c2501b43c1b56e3efa74048a18f8ce06ba07fe of >=3.8.0
-  GTEST_SKIP() << "TextFormat::Parser::SetRecursionLimit() is not available";
-#endif  // GOOGLE_PROTOBUF_VERSION
+  if (!TextParserCanSetRecursionLimit())
+    GTEST_SKIP() << "TextFormat::Parser::SetRecursionLimit() is not available";
   typename TestFixture::Message message;
   typename TestFixture::Message* last = &message;
   for (int i = 0; i < 150; ++i) {

src/text_format.cc

diff --git a/src/text_format.cc b/src/text_format.cc
index 4bfb579..904ba82 100644
--- a/src/text_format.cc
+++ b/src/text_format.cc
@@ -28,13 +28,8 @@
 bool ParseTextMessage(const std::string& data, protobuf::Message* output) {
   output->Clear();
   TextFormat::Parser parser;
-#if GOOGLE_PROTOBUF_VERSION >= 3008000  // commit d8c2501b43c1b56e3efa74048a18f8ce06ba07fe of >=3.8.0
-  parser.SetRecursionLimit(100);
-#endif
   parser.AllowPartialMessage(true);
-#if GOOGLE_PROTOBUF_VERSION >= 3008000  // commit 176f7db11d8242b36a3ea6abb1cc436fca5bf75d of >=3.8.0
-  parser.AllowUnknownField(true);
-#endif
+  PrepareTextParser(parser);
   if (!parser.ParseFromString(data, output)) {
     output->Clear();
     return false;