intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 79 insertions, 0 deletions

diff --git a/library/cpp/protobuf/json/json_output.h b/library/cpp/protobuf/json/json_output.h
new file mode 100644
index 0000000000..df143af57a
--- /dev/null
+++ b/library/cpp/protobuf/json/json_output.h
@@ -0,0 +1,79 @@
+#pragma once
+
+#include <util/generic/ptr.h>
+#include <util/generic/strbuf.h>
+
+namespace NProtobufJson {
+    class IJsonOutput {
+    public:
+        template <typename T>
+        IJsonOutput& Write(const T& t) {
+            DoWrite(t);
+            return *this;
+        }
+        IJsonOutput& WriteNull() {
+            DoWriteNull();
+            return *this;
+        }
+
+        IJsonOutput& BeginList() {
+            DoBeginList();
+            return *this;
+        }
+        IJsonOutput& EndList() {
+            DoEndList();
+            return *this;
+        }
+
+        IJsonOutput& BeginObject() {
+            DoBeginObject();
+            return *this;
+        }
+        IJsonOutput& WriteKey(const TStringBuf& key) {
+            DoWriteKey(key);
+            return *this;
+        }
+        IJsonOutput& EndObject() {
+            DoEndObject();
+            return *this;
+        }
+
+        IJsonOutput& WriteRawJson(const TStringBuf& str) {
+            DoWriteRawJson(str);
+            return *this;
+        }
+
+        virtual ~IJsonOutput() {
+        }
+
+    protected:
+        virtual void DoWrite(const TStringBuf& s) = 0;
+        virtual void DoWrite(const TString& s) = 0;
+        virtual void DoWrite(int i) = 0;
+        void DoWrite(long i) {
+            DoWrite(static_cast<long long>(i));
+        }
+        virtual void DoWrite(long long i) = 0;
+        virtual void DoWrite(unsigned int i) = 0;
+        void DoWrite(unsigned long i) {
+            DoWrite(static_cast<unsigned long long>(i));
+        }
+        virtual void DoWrite(unsigned long long i) = 0;
+        virtual void DoWrite(float f) = 0;
+        virtual void DoWrite(double f) = 0;
+        virtual void DoWrite(bool b) = 0;
+        virtual void DoWriteNull() = 0;
+
+        virtual void DoBeginList() = 0;
+        virtual void DoEndList() = 0;
+
+        virtual void DoBeginObject() = 0;
+        virtual void DoWriteKey(const TStringBuf& key) = 0;
+        virtual void DoEndObject() = 0;
+
+        virtual void DoWriteRawJson(const TStringBuf& str) = 0;
+    };
+
+    using TJsonMapOutputPtr = THolder<IJsonOutput>;
+
+}