intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 40 insertions, 0 deletions

diff --git a/library/cpp/protobuf/json/field_option.h b/library/cpp/protobuf/json/field_option.h
new file mode 100644
index 0000000000..c8a8bfbff5
--- /dev/null
+++ b/library/cpp/protobuf/json/field_option.h
@@ -0,0 +1,40 @@
+#pragma once
+
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/message.h>
+
+namespace NProtobufJson {
+    // Functor that defines whether given field has some option set to true
+    //
+    // Example:
+    // message T {
+    //     optional stroka some_field = 1 [(some_option) = true];
+    // }
+    //
+    template <typename TFieldOptionExtensionId>
+    class TFieldOptionFunctor {
+    public:
+        TFieldOptionFunctor(const TFieldOptionExtensionId& option, bool positive = true)
+            : Option(option)
+            , Positive(positive)
+        {
+        }
+
+        bool operator()(const NProtoBuf::Message&, const NProtoBuf::FieldDescriptor* field) const {
+            const NProtoBuf::FieldOptions& opt = field->options();
+            const bool val = opt.GetExtension(Option);
+            return Positive ? val : !val;
+        }
+
+    private:
+        const TFieldOptionExtensionId& Option;
+        bool Positive;
+    };
+
+    template <typename TFieldOptionExtensionId>
+    TFieldOptionFunctor<TFieldOptionExtensionId> MakeFieldOptionFunctor(const TFieldOptionExtensionId& option, bool positive = true) {
+        return TFieldOptionFunctor<TFieldOptionExtensionId>(option, positive);
+    }
+
+}