MVJSON.cpp

## MVJSON.cpp
/*
 *
 *	Compact JSON format parsing lib (native cross-platform c++)
 *
 *	Copyright (C) 2013 Victor Laskin (victor.laskin@gmail.com)
 *	Details: http://vitiy.info/?p=102
 *
 *	Redistribution and use in source and binary forms, with or without
 *	modification, are permitted provided that the following conditions
 *	are met:
 *	1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  3. The names of the authors may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 *	THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
 *	OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *	ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
 *	DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *	DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *	GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 *	IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 *	OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 *	IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "MVJSON.h"

namespace JSON {


MVJSONReader::MVJSONReader(const string & source) {
    root = nullptr;
    if (source == "") return;


    if (source[0] == '{')
        root = parse(source);
    if (source[0] == '[')
        root = parse("{\"root\":" + source + "}");
}

MVJSONReader::~MVJSONReader() {
	if (root != NULL)
		delete root;
}

MVJSONNode::~MVJSONNode() {
	if (values.size() > 0)
		for (int i = 0; i < values.size(); i++)
			delete values.at(i);
}


MVJSONNode* MVJSONReader::parse(string text)
{
	string s = trim(text);
	if (s.length() < 2) return NULL;

	// object
	if ((s[0] == '{') && (s[s.length() - 1] == '}'))
	{
		// erase last and first symbols
		s.erase(0, 1);
		s.erase(s.length() - 1, 1);

		vector<string> parts;
		splitList(s, parts);

		MVJSONNode* node = new MVJSONNode();

		for (int i = 0; i < parts.size(); i++)
			node->values.push_back(parseValue(parts.at(i), false));

		return node;
	}

	return NULL;
}


MVJSONValue* MVJSONReader::parseValue(string text, bool hasNoName)
{
	string key;
	string s;
	splitInHalf(text, ":", key, s);
	key = trim(key);
	s = trim(s);
	if (key.length() > 2)
	{
		// strip "
		key.erase(0, 1);
		key.erase(key.length() - 1, 1);
	}

	if (hasNoName)
	{
		s = text;
		key = "";
	}


	if (s == "false") // bool
		return new MVJSONValue(key, false);

	if (s == "true")  // bool
		return new MVJSONValue(key, true);

	if (s == "null") // null
		return new MVJSONValue(key, MVJSON_TYPE_NULL);

	char first = s[0];

	if (first == '"') // string
		return new MVJSONValue(key, s.substr(1, s.length() - 2));

	if (first == '{') // object
		return new MVJSONValue(key, parse(s));

	if (first == '[') // array
	{
		s.erase(0, 1);
		s.erase(s.length() - 1, 1);

 		MVJSONValue* val = new MVJSONValue(key, MVJSON_TYPE_ARRAY);

        if (s != "")
        {
            vector<string> parts;
            splitList(s, parts);
            for (int i = 0; i < parts.size(); i++)
                val->arrayValue.push_back(parseValue(parts.at(i), true));
        }
        return val;
	}

	// else its number!
	if (s.find(".") == string::npos)
		return new MVJSONValue(key, s, stringToLongLong(s));
	else
		return new MVJSONValue(key, s, stringToDouble(s));

	return NULL;
}

MVJSONValue::~MVJSONValue()
{
	if (objValue != NULL)
		delete objValue;
	if (arrayValue.size() > 0)
		for (int i = 0; i < arrayValue.size(); i++)
			delete arrayValue.at(i);
}

void MVJSONValue::init(MVJSON_TYPE valueType)
{
	this->valueType = valueType;
	objValue = NULL;
	name = "";
}

MVJSONValue::MVJSONValue(const string& name, MVJSON_TYPE valueType)
{
	init(valueType);
	this->name = name;
}

MVJSONValue::MVJSONValue(const string& name, bool value)
{
	init(MVJSON_TYPE_BOOL);
	this->name = name;
	boolValue = value;
}

MVJSONValue::MVJSONValue(const string& name, const string& value)
{
	init(MVJSON_TYPE_STRING);
	this->name = name;

	stringValue = value;

	// here we switch back special chars
	//	\"	\\	\/	\b	\f	\n	\r	\t	\u four-hex-digits
	replace(stringValue, "\\\"", "\"");
	replace(stringValue, "\\\\", "\\");
	replace(stringValue, "\\/", "/");
	replace(stringValue, "\\b", "\b");
	replace(stringValue, "\\f", "\f");
	replace(stringValue, "\\n", "\n");
	replace(stringValue, "\\r", "\r");
	replace(stringValue, "\\t", "\t");

	// TODO - \u four-hex-digits
	// SS::replace(stringValue, "\\\\", "\\");

}

MVJSONValue::MVJSONValue(const string& name, const string& source, long long value)
{
	init(MVJSON_TYPE_INT);
	this->name = name;
    stringValue = source;
	intValue = value;
}

MVJSONValue::MVJSONValue(const string& name, const string& source, double value)
{
	init(MVJSON_TYPE_DOUBLE);
	this->name = name;
    stringValue = source;
	doubleValue = value;
}

MVJSONValue::MVJSONValue(const string& name, MVJSONNode* value)
{
	init(MVJSON_TYPE_OBJECT);
	this->name = name;
	objValue = value;
}

bool MVJSONNode::hasField(const string& name)
{
	if (values.size() == 0) return false;
	for (int i = 0; i < values.size(); i++)
		if (values.at(i)->name == name)
			return true;
	return false;
}

MVJSONValue* MVJSONNode::getField(const string& name)
{
	if (values.size() == 0) return NULL;
	for (int i = 0; i < values.size(); i++)
		if (values.at(i)->name == name)
			return values.at(i);
	return NULL;
}

    MVJSONValue* MVJSONValue::field(const string& name) {
        return objValue->getField(name);
    }


double MVJSONNode::getFieldDouble(const string& name)
{
	MVJSONValue* value = getField(name);
	if (value == NULL) return 0;
	if (value->valueType == MVJSON_TYPE_INT) return value->intValue;
	if (value->valueType == MVJSON_TYPE_DOUBLE) return value->doubleValue;
	return 0;
}

int MVJSONNode::getFieldInt(const string& name)
{
	MVJSONValue* value = getField(name);
	if (value == NULL) return 0;
	if (value->valueType == MVJSON_TYPE_INT) return (int)value->intValue;
	return 0;
}

    long long MVJSONNode::getFieldLongLong(const string& name)
    {
        MVJSONValue* value = getField(name);
        if (value == NULL) return 0;
        if (value->valueType == MVJSON_TYPE_INT) return value->intValue;
        return 0;
    }

string MVJSONNode::getFieldString(const string& name)
{
	MVJSONValue* value = getField(name);
	if (value == NULL) return "";
	if (value->valueType == MVJSON_TYPE_STRING) return value->stringValue;
    if (value->valueType == MVJSON_TYPE_DOUBLE) return value->stringValue;
    if (value->valueType == MVJSON_TYPE_INT) return value->stringValue;
	return "";
}

bool MVJSONNode::getFieldBool(const string& name)
{
	MVJSONValue* value = getField(name);
	if (value == NULL) return false;
	if (value->valueType == MVJSON_TYPE_INT) return (bool)value->intValue;
	if (value->valueType == MVJSON_TYPE_BOOL) return value->boolValue;
	return false;
}


double MVJSONValue::getFieldDouble(const string& name)
{
	if (objValue == NULL) return 0;
	return objValue->getFieldDouble(name);
}

int MVJSONValue::getFieldInt(const string& name)
{
	if (objValue == NULL) return 0;
	return objValue->getFieldInt(name);
}

    long long  MVJSONValue::getFieldLongLong(const string& name)
    {
        if (objValue == NULL) return 0;
        return objValue->getFieldLongLong(name);
    }

string MVJSONValue::getFieldString(const string& name)
{
	if (objValue == NULL) return "";
	return objValue->getFieldString(name);
}

bool MVJSONValue::getFieldBool(const string& name)
{
	if (objValue == NULL) return false;
	return objValue->getFieldBool(name);
}


// -------------------- writer -------------------------->

    MVJSONWriter::MVJSONWriter()
    {
        result = "";
        depth = 0;
        counts.resize(50);
        std::fill(counts.begin(), counts.end(), 0);
    }


} /* namespace F2 */

## MVJSON.h
/*
 *
 *	Compact JSON format parsing lib (native cross-platform c++)
 *
 *	Copyright (C) 2013 Victor Laskin (victor.laskin@gmail.com)
 *	Details: http://vitiy.info/compact-lib-for-json-parsing-cross-platform-c/
 *
 *	Redistribution and use in source and binary forms, with or without
 *	modification, are permitted provided that the following conditions
 *	are met:
 *	1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  3. The names of the authors may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 *	THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
 *	OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *	ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
 *	DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *	DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *	GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 *	IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 *	OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 *	IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */


#include <string>
#include <vector>
#include <sstream>
#include <stdlib.h>

#ifndef MVJSON_H_
#define MVJSON_H_

using namespace std;

namespace JSON {

/// JSON node types
enum MVJSON_TYPE
{
	MVJSON_TYPE_NULL,
	MVJSON_TYPE_OBJECT,
	MVJSON_TYPE_ARRAY,
	MVJSON_TYPE_STRING,
	MVJSON_TYPE_INT,
	MVJSON_TYPE_DOUBLE,
	MVJSON_TYPE_BOOL
};

class MVJSONUtils {
protected:

	// string parsing functions
	inline static long long stringToLongLong(const string & s);											///< convert string to long long
	inline static double stringToDouble(const string & s);										///< convert string to float
	inline static bool symbolToBeTrimmed(const char& c);										///< check if symbol is space, tab or new line break
	inline static string trim(const string & text);												///< trim spaces, tabs and line break
	inline static void replace(string & target, const string & oldStr, const string & newStr);  ///< replace all occurrences of substring
	inline static void splitInHalf(const string & s, const string & separator, string & begin, string & end);	///< second half (output)
	inline static void splitList(const string & s,  vector<string> & parts);
};


class MVJSONNode;

/// JSON Value
class MVJSONValue : public MVJSONUtils {
public:
	MVJSONValue(const string& name, MVJSON_TYPE valueType);
	MVJSONValue(const string& name, bool value);
	MVJSONValue(const string& name, const string& value);
	MVJSONValue(const string& name, const string& source, long long value);
	MVJSONValue(const string& name, const string& source, double value);
	MVJSONValue(const string& name, MVJSONNode* value);
	virtual ~MVJSONValue();

	string name;							///< value name [optional]
	MVJSON_TYPE valueType;					///< type of node

	string stringValue;						///< value if data has string type
	bool boolValue;							///< value if data has bool type
	long long intValue;                     ///< value if data has int type
	double doubleValue;						///< value if data has double type
	MVJSONNode* objValue;					///< value if data has object type

	vector<MVJSONValue*> arrayValue;		///< array of values

    MVJSONValue* field(const string& name);
	double getFieldDouble(const string& name);		///< get value of double field of VALUE OBJECT (objValue)
	int getFieldInt(const string& name);			///< get value of int field of VALUE OBJECT (objValue)
	string getFieldString(const string& name);		///< get value of string field of VALUE OBJECT (objValue)
	bool getFieldBool(const string& name);			///< get value of bool field of VALUE OBJECT (objValue)
    long long getFieldLongLong(const string& name); ///< get long long value from field


	inline MVJSONValue* at(unsigned int i){ return arrayValue.at(i); }
	inline int size() { if (valueType == MVJSON_TYPE_ARRAY) return arrayValue.size(); else return 1; }
private:
	void init(MVJSON_TYPE valueType);
};

    template <typename T> struct is_vector { static const bool value = false; };
    template <typename T> struct is_vector< std::vector<T> > { static const bool value = true; };
    template <typename T> struct is_vector< const std::vector<T> > { static const bool value = true; };


/// JSON Node (Object)
class MVJSONNode {
public:

	virtual ~MVJSONNode();

	vector<MVJSONValue*> values; 			///< values (props)

	bool hasField(const string& name);				///< check that object has field
	MVJSONValue* getField(const string& name);		///< get field by name

    template<class T>
    inline T getValue(const string& name, typename enable_if<!is_vector<T>::value, T>::type* = nullptr); ///< get value of specified type

    template<class T>
    inline T getValue(const string& name, typename enable_if<is_vector<T>::value, T>::type* = nullptr); ///< get value of specified type


	double getFieldDouble(const string& name);		///< get value of double field
	int getFieldInt(const string& name);			///< get value of int field
    long long getFieldLongLong(const string& name);			///< get value of int field
	string getFieldString(const string& name);		///< get value of string field
	bool getFieldBool(const string& name);			///< get value of bool field
};

/// Compact JSON parser (based on specification: http://www.json.org/)
class MVJSONReader : public MVJSONUtils {
public:
	MVJSONReader(const string & source);	///< constructor from json source
	virtual ~MVJSONReader();

	MVJSONNode* root;						///< root object (if its null - parsing was failed)

private:
	MVJSONValue* parseValue(string text, bool hasNoName);					///< parse value
	MVJSONNode* parse(string text);											///< parse node


};


    /// Simple writer into JSON format
    class MVJSONWriter : public MVJSONUtils {
    public:
        MVJSONWriter();
        string result;

        inline MVJSONWriter& begin();
        inline MVJSONWriter& begin(const string& name);
        inline MVJSONWriter& end();
        inline MVJSONWriter& beginList(const string& name);
        inline MVJSONWriter& endList();

        template< typename T >
        inline MVJSONWriter& add(const string& name, const T& value);

        template< typename T >
        inline MVJSONWriter& add(const T& value);

        inline MVJSONWriter& include(const string& json);

    private:
        inline void addComma();
        vector<int> counts;
        int depth;

        template< typename T >
        inline string toString(const T& value);

        template< typename T >
        inline string toString(const vector<T>& value);
    };

    // --------------- reader ------------------------------------->


    template<class T>
    //inline typename enable_if<!is_vector<T>::value, T>::type
    inline T
    MVJSONNode::getValue(const string& name, typename enable_if<!is_vector<T>::value, T>::type*)
    {
        MVJSONValue* value = getField(name);
        if (value == NULL) return "";
        return value->stringValue;
    }

    template<class T>
    //inline typename enable_if<is_vector<T>::value, T>::type
    inline T
    MVJSONNode::getValue(const string& name, typename enable_if<is_vector<T>::value, T>::type*)
    {
        typename std::remove_const<T>::type result;
        MVJSONValue* value = getField(name);
        if (value == NULL) return result;
        for (auto item : value->arrayValue)
        {
            result.push_back(remove_pointer<decltype(std::declval<T>().at(0).get())>::type::fromJSON(item->objValue));
        }
        return result;
    }


    template<>
    //inline typename enable_if<is_vector<T>::value, T>::type
    inline const vector<int>
    MVJSONNode::getValue(const string& name, typename enable_if<is_vector<const vector<int>>::value, const vector<int>>::type*)
    {
        vector<int> result;
        MVJSONValue* value = getField(name);
        if (value == NULL) return result;
        for (auto item : value->arrayValue)
        {
            result.push_back((int)item->intValue);
        }
        return result;
    }


    template<>
    inline const long long MVJSONNode::getValue(const string& name, typename enable_if<!is_vector<const long long>::value, const long long>::type*)
    {
        MVJSONValue* value = getField(name);
        if (value == NULL) return 0;
        return value->intValue;
    }

    template<>
    inline const long MVJSONNode::getValue(const string& name, typename enable_if<!is_vector<const long>::value, const long>::type*)
    {
        MVJSONValue* value = getField(name);
        if (value == NULL) return 0;
        return (long)value->intValue;
    }

    template<>
    inline const int MVJSONNode::getValue(const string& name, typename enable_if<!is_vector<const int>::value, const int>::type*)
    {
        MVJSONValue* value = getField(name);
        if (value == NULL) return 0;
        return (int)value->intValue;
    }


    template<>
    inline  const bool MVJSONNode::getValue(const string& name, typename enable_if<!is_vector<const bool>::value, const bool>::type*)
    {
        MVJSONValue* value = getField(name);
        if (value == NULL) return false;
        return value->boolValue;
    }

    template<>
    inline  const double MVJSONNode::getValue(const string& name, typename enable_if<!is_vector<const double>::value, const double>::type*)
    {
        MVJSONValue* value = getField(name);
        if (value == NULL) return 0.0;
        return value->doubleValue;
    }

    template<>
    inline  const float MVJSONNode::getValue(const string& name, typename enable_if<!is_vector<const float>::value, const float>::type*)
    {
        MVJSONValue* value = getField(name);
        if (value == NULL) return 0.0;
        return value->doubleValue;
    }


// ------------------- inlined string processing functions ------------->


inline long long MVJSONUtils::stringToLongLong(const string & s)
{
	return atoll(s.c_str());
}


inline double MVJSONUtils::stringToDouble(const string & s)
{
	return atof(s.c_str());
}


inline bool MVJSONUtils::symbolToBeTrimmed(const char& c   ///< the char to test
)
{
	if (c == ' ') return true;
	if (c == '\n') return true;
	if (c == '\r') return true;
	if (c == '\t') return true;
	return false;
}


inline string  MVJSONUtils::trim(const string & text  ///< the text to trim
)
{
	if (text.length() == 0) return "";
	int start = 0;
	while ((start < text.length()) && (symbolToBeTrimmed(text[start]))) start++;
	int end = text.length() - 1;
	while ((end > 0) && (symbolToBeTrimmed(text[end]))) end--;
	if (start > end) return "";

	return text.substr(start, end - start + 1);
}

inline void MVJSONUtils::splitInHalf(const string & s,						///< source string to split up
									  const string & separator,				///< separator string)
									  string & begin,						///< first part (output)
									  string & end							///< second half (output)
)
{
	int pos = s.find(separator);
	if (pos == string::npos) { begin = s; end = ""; return; }

	begin = s.substr(0, pos);
	end = s.substr(pos + separator.length(), s.length() - pos - separator.length());
}

/// split string by "," - ignore content inside of "{", "}", "[", "]" and quotations "...."
/// also take \" into account
/// (Code should be cleared of comments beforehand)
inline void MVJSONUtils::splitList(const string & s,				///< string to be splitted
									vector<string> & parts			///< result parts
)
{

	bool isNotInQuotes = true;
	int b1 = 0;
	int b2 = 0;
	int lastPos = 0;

	const char* start = s.c_str();
	const char* ps = start;

	while (*ps) // *ps != 0
	{
		if ((*ps == ',') && (isNotInQuotes) && (b1 == 0) && (b2 == 0))
		{
			parts.push_back(s.substr(lastPos, ps - start - lastPos));
			lastPos = ps - start + 1;
		}

		if (isNotInQuotes)
		{
			if (*ps == '{') b1++;
			if (*ps == '}') b1--;
			if (*ps == '[') b2++;
			if (*ps == ']') b2--;
		}

		if (*ps == '"')
		{
			isNotInQuotes = !isNotInQuotes;
			if (ps != start)
				if (*(ps-1) == '\\')
					isNotInQuotes = !isNotInQuotes;
		}

		ps++;
	}

	parts.push_back(s.substr(lastPos, s.length() - lastPos));
}

inline void MVJSONUtils::replace(string & target,			///< text to be modified
								  const string & oldStr,		///< old string
								  const string & newStr		///< new string
)
{
	unsigned int pos = 0;
	unsigned int oldLen = oldStr.length();
	unsigned int newLen = newStr.length();

	for (;;)
	{
		pos = target.find(oldStr, pos);
		if (pos == string::npos) break;
		target.replace(pos, oldLen, newStr);
		pos += newLen;
	}
}


    // ------------------------ writer ----------------------->


    inline void MVJSONWriter::addComma()
    {
        if (depth < 0) return;
        if (counts[depth] > 0) result += ",";
    }


    inline MVJSONWriter& MVJSONWriter::begin()
    {
        addComma();
        result += "{";
        counts[depth]++;
        depth++;
        counts[depth] = 0;
        return *this;
    }

    inline MVJSONWriter& MVJSONWriter::begin(const string& name)
    {
        addComma();
        result += "\"" + name + "\":{";
        counts[depth]++;
        depth++;
        counts[depth] = 0;
        return *this;
    }

    inline MVJSONWriter& MVJSONWriter::end()
    {
        result += "}";
        depth--;
        return *this;
    }

    template< typename T >
    inline MVJSONWriter& MVJSONWriter::add(const string& name, const T& value)
    {
        addComma();
        result += "\"" + name + "\":" + toString(value);
        counts[depth]++;
        return *this;
    }

    template< typename T >
    inline MVJSONWriter& MVJSONWriter::add(const T& value)
    {
        addComma();
        result += toString(value);
        counts[depth]++;
        return *this;
    }

    inline MVJSONWriter& MVJSONWriter::include(const string& json)
    {
        addComma();
        result += json;
        counts[depth]++;
        return *this;

    }

    inline MVJSONWriter& MVJSONWriter::beginList(const string& name)
    {
        addComma();
        result += "\"" + name + "\":[";
        counts[depth]++;
        depth++;
        counts[depth] = 0;
        return *this;
    }

    inline MVJSONWriter& MVJSONWriter::endList()
    {
        result += "]";
        depth--;
        return *this;
    }

    template< typename T >
    inline string MVJSONWriter::toString(const T& value)
    {
        // default overload is for string-like types!
        return "\"" + value + "\"";
        /*
        std::stringstream ss;
        //ss.precision(6);
        ss << value;
        return ss.str();
        */
    }

    template< typename T >
    inline string MVJSONWriter::toString(const vector<T>& value)
    {
        string result = "[";
        for (auto item : value)
            result += ((result != "[") ? "," : "") + item->toJSON();
        result += "]";
        return result;
    }

    template<>
    inline string MVJSONWriter::toString(const vector<int>& value)
    {
        string result = "[";
        for (auto item : value)
            result += ((result != "[") ? "," : "") + std::to_string(item);
        result += "]";
        return result;
    }

    template<>
    inline string MVJSONWriter::toString(const int& value)
    {
        return std::to_string(value);
    }

    template<>
    inline string MVJSONWriter::toString(const double& value)
    {
        std::ostringstream os ;
        os.precision(10);
        os << value ;
        return os.str() ;
    }

    template<>
    inline string MVJSONWriter::toString(const float& value)
    {
        return std::to_string(value);
    }

    template<>
    inline string MVJSONWriter::toString(const long long& value)
    {
        return std::to_string(value);
    }

    template<>
    inline string MVJSONWriter::toString(const bool& value)
    {
        return value ? "true" : "false";
    }

#if defined(OS_LINUX) || defined(F2_EMSCRIPTEN)
    template<>
    inline string MVJSONWriter::toString(const time_t& value)
    {
        return std::to_string(value);
    }
#endif

	template<>
	inline string MVJSONWriter::toString(const string& value)
	{
		return "\"" + value + "\"";
	}

	template<>
	inline string MVJSONWriter::toString(const char* const & value)
	{
		return "\"" + string(value) + "\"";
	}


} /* namespace F2 */
#endif /* MVJSON_H_ */