ArduinoJson/include/ArduinoJson/Internals/JsonNode.hpp

#pragma once

namespace ArduinoJson
{
    class JsonBuffer;
    
    namespace Internals
    {
        class JsonWriter;
        class JsonNodeIterator;

        class JsonNode
        {
            friend class JsonNodeIterator;

            enum JsonNodeType
            {
                JSON_UNDEFINED,
                JSON_NULL,
                JSON_ARRAY,
                JSON_OBJECT,
                JSON_KEY_VALUE,
                JSON_BOOLEAN,
                JSON_STRING,
                JSON_LONG,
                JSON_PROXY,
                JSON_DOUBLE_0_DECIMALS,
                JSON_DOUBLE_1_DECIMAL,
                JSON_DOUBLE_2_DECIMALS,
                // etc.
            };

            union JsonNodeContent
            {
                bool asBoolean;
                double asDouble;
                long asInteger;
                const char* asString;

                struct
                {
                    const char* key;
                    JsonNode* value;
                } asKeyValue;

                struct
                {
                    JsonNode* child;
                    JsonBuffer* buffer;
                } asContainer;

                struct
                {
                    JsonNode* target;
                } asProxy;

            };

        public:
            JsonNode()
            : type(JSON_UNDEFINED), next(0)
            {

            }

            void writeTo(JsonWriter&); // TODO: <- move in JsonNodeSerializer

            void setAsArray(JsonBuffer* buffer)
            {
                type = JSON_ARRAY;
                content.asContainer.child = 0;
                content.asContainer.buffer = buffer;
            }

            void setAsBoolean(bool value)
            {
                type = JSON_BOOLEAN;
                content.asBoolean = value;
            }

            void setAsLong(int value)
            {
                type = JSON_LONG;
                content.asInteger = value;
            }

            void setAsString(char const* value)
            {
                type = JSON_STRING;
                content.asString = value;
            }

            void setAsDouble(double value, int decimals)
            {
                type = static_cast<JsonNodeType>(JSON_DOUBLE_0_DECIMALS + decimals);
                content.asDouble = value;
            }

            void setAsObject(JsonBuffer* buffer)
            {
                type = JSON_OBJECT;
                content.asContainer.child = 0;
                content.asContainer.buffer = buffer;
            }

            void setAsObjectKeyValue(const char* key, JsonNode* value)
            {
                type = JSON_KEY_VALUE;
                content.asKeyValue.key = key;
                content.asKeyValue.value = value;
            }

            bool getAsBoolean()
            {
                return type == JSON_BOOLEAN ? content.asBoolean : false;
            }

            double getAsDouble()
            {
                return type >= JSON_DOUBLE_0_DECIMALS ? content.asDouble : 0;
            }

            long getAsInteger()
            {
                return type == JSON_LONG ? content.asInteger : 0;
            }

            const char* getAsString()
            {
                return type == JSON_STRING ? content.asString : 0;
            }

            JsonBuffer* getContainerBuffer()
            {
                if (type == JSON_PROXY) return content.asProxy.target->getContainerBuffer();
                return type == JSON_ARRAY || type == JSON_OBJECT ? content.asContainer.buffer : 0;
            }

            JsonNode* getContainerChild()
            {
                if (type == JSON_PROXY) return content.asProxy.target->getContainerChild();
                return type == JSON_ARRAY || type == JSON_OBJECT ? content.asContainer.child : 0;
            }

            const char* getAsObjectKey()
            {
                return type == JSON_KEY_VALUE ? content.asKeyValue.key : 0;
            }

            JsonNode* getAsObjectValue()
            {
                return type == JSON_KEY_VALUE ? content.asKeyValue.value : 0;
            }

            JsonNode* getProxyTarget()
            {        
                return type == JSON_PROXY ? content.asProxy.target : this;
            }

            bool isArray()
            {
                return type == JSON_ARRAY;
            }

            bool isObject()
            {
                return type == JSON_OBJECT;
            }

            void addChild(JsonNode* childToAdd);

            void removeChild(JsonNode* childToRemove);

            void duplicate(JsonNode* other);

        private:
            JsonNodeType type;
            JsonNode* next;
            JsonNodeContent content;

            inline void writeArrayTo(JsonWriter&);// TODO: <- move in JsonNodeSerializer
            inline void writeObjectTo(JsonWriter&);// TODO: <- move in JsonNodeSerializer

            void setAsProxyOfSelf();

            void setAsProxyOf(JsonNode* target)
            {
                type = JSON_PROXY;
                content.asProxy.target = target;
            }
        };
    }
}