delete or modify JSON value

QJsonUtils.h

#pragma once

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

// QT include
#include <QString>
#include <QJsonObject>
#include <QJsonValue>
#include <QJsonArray>

class QJsonUtils
{
public:

	static void modifyValue(QJsonObject& value, std::list<std::string> path, const QJsonValue& newValue = QJsonValue::Null)
	{
		QJsonObject result;
		
		if (path.front() == "[root]")
			path.pop_front();
		
		modifyValue(value, result, path, newValue);
		value = result;
	}
	
private:

	static void modifyValue(QJsonValue source, QJsonObject& target, std::list<std::string> path, const QJsonValue& newValue)
	{
		QJsonObject obj = source.toObject();
		for (QJsonObject::iterator i = obj.begin(); i != obj.end(); ++i)
		{
			QString propertyName = i.key();
			QJsonValue subValue = obj[propertyName];
			
			if (subValue.isObject())
			{
				if (propertyName.toStdString() == path.front())
				{
					path.pop_front();
					
					if (!path.empty())
					{
						QJsonObject obj;
						modifyValue(subValue, obj, path, newValue);
						subValue = obj;
					}
					else if (newValue != QJsonValue::Null)
					{
						subValue = newValue;
					}
					else
						continue;
					
					if (!subValue.toObject().isEmpty())
						target[propertyName] = subValue;
				}
				else
					if (!subValue.toObject().isEmpty())
						target[propertyName] = subValue;
			}
			else if (subValue.isArray())
			{
				if (propertyName.toStdString() == path.front())
				{
					path.pop_front();
					
					if ( (path.front().substr(0,1) == "[" ) && ( path.front().substr(path.front().length()-1, 1) == "]") )
						path.pop_front();
					
					QJsonArray array = subValue.toArray();
					QJsonArray json_array;
					
					for (QJsonArray::iterator i = array.begin(); i != array.end(); ++i)
					{
						if (!path.empty())
						{
							QJsonObject arr;
							modifyValue(*i, arr, path, newValue);
							subValue = arr;
						}
						else if (newValue != QJsonValue::Null)
						{
							subValue = newValue;
						}
						else
							continue;
						
						if (!subValue.toObject().isEmpty())
							json_array.append(subValue);
						
					}
					
					target[propertyName] = json_array;
				}
				else
					if (!subValue.toArray().isEmpty())
						target[propertyName] = subValue;
			}
			else
			{
				if (propertyName.toStdString() == path.front())
				{
					path.pop_front();
					
					if (path.empty())
					{
						if (newValue != QJsonValue::Null)
						{
							subValue = newValue;
						}
						else
							continue;
					}

					target[propertyName] = subValue;
				}
				else
					target[propertyName] = subValue;
			}
		}
	}
};