Extracted StringReader and StringWriter from JsonParser

Split `Internals/` folder into `Data/`, `Deserialization/`, `Serialization/`

include/ArduinoJson/Serialization/JsonSerializer.hpp

@@ -0,0 +1,33 @@
+// Copyright Benoit Blanchon 2014-2016
+// MIT License
+//
+// Arduino JSON library
+// https://github.com/bblanchon/ArduinoJson
+// If you like this project, please add a star!
+
+#pragma once
+
+#include "JsonWriter.hpp"
+
+namespace ArduinoJson {
+
+class JsonArray;
+class JsonArraySubscript;
+class JsonObject;
+template <typename TKey>
+class JsonObjectSubscript;
+class JsonVariant;
+
+namespace Internals {
+
+class JsonSerializer {
+ public:
+  static void serialize(const JsonArray &, JsonWriter &);
+  static void serialize(const JsonArraySubscript &, JsonWriter &);
+  static void serialize(const JsonObject &, JsonWriter &);
+  template <typename TKey>
+  static void serialize(const JsonObjectSubscript<TKey> &, JsonWriter &);
+  static void serialize(const JsonVariant &, JsonWriter &);
+};
+}
+}