jsonfileloader.c

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class JsonFileLoader<Class T>
{
    protected static ref JsonSerializer m_Serializer = new JsonSerializer();
    
    static bool LoadFile(string filename, out T data, out string errorMessage)
    {
        if (FileExist(filename))
        {
            FileHandle handle = OpenFile(filename, FileMode.READ);
            if (handle == 0)
            {
                errorMessage = string.Format("Cannot open file \"%1\" for reading", filename);
                return false;
            }
            
            string fileContent;
            string lineContent;
            while (FGets(handle, lineContent) >= 0)
            {
                fileContent += lineContent;
            }
            
            CloseFile(handle);
            
            if (!m_Serializer)
                m_Serializer = new JsonSerializer();
 
            string error;
            if (!m_Serializer.ReadFromString(data, fileContent, error))
            {
                errorMessage = string.Format("Cannot load data from \"%1\":\n%2", filename, error);
                return false;
            }
            
            return true;
        }
        else
        {
            errorMessage = string.Format("File \"%1\" does not exist, check the provided path", filename, error);
            return false;
        }
    }
    
    static bool SaveFile(string filename, T data, out string errorMessage)
    {
        string fileContent;
 
        if (!m_Serializer)
            m_Serializer = new JsonSerializer();
 
        string makeDataError;
        if (!MakeData(data, fileContent, makeDataError, true))
        {
            errorMessage = string.Format("Cannot save data to file \"%1\", %2", filename, makeDataError);
            return false;
        }   
 
        FileHandle handle = OpenFile(filename, FileMode.WRITE);
        if (handle == 0)
        {
            errorMessage = string.Format("Cannot open file \"%1\" for writing", filename);
            return false;
        }
 
        FPrint(handle, fileContent);
        CloseFile(handle);
 
        return true;
    }
    
    static bool LoadData(string string_data, out T data, out string errorMessage)
    {
        string error;
 
        if (!m_Serializer)
            m_Serializer = new JsonSerializer();
        
        if (!m_Serializer.ReadFromString(data, string_data, error))
        {
            errorMessage = string.Format("Cannot load provided JSON data (deserialization error) - check syntax: %1", error);
            return false;
        }
        
        return true;
    }
    
    static bool MakeData(T inputData, out string outputData, out string errorMessage, bool prettyPrint = true)
    {
        if (!m_Serializer)
            m_Serializer = new JsonSerializer();
        
        if (!m_Serializer.WriteToString(inputData, prettyPrint, outputData))
        {
            errorMessage = "Cannot create JSON from provided data (serialization error)";
            return false;
        }
        
        return true;
    }
    
 
    
    static void JsonLoadFile(string filename, out T data)
    {
        
        if (FileExist(filename))
        {
            string file_content;
            string line_content;
            string error;
            
            FileHandle handle = OpenFile(filename, FileMode.READ);
            if (handle == 0)
                return;
 
            while (FGets(handle,  line_content) >= 0)
            {
                file_content += line_content;
            }
            
            CloseFile(handle);
            
            if (!m_Serializer)
                m_Serializer = new JsonSerializer();
            
            if (!m_Serializer.ReadFromString(data, file_content, error))
                ErrorEx(string.Format("Cannot load data from \"%1\":\n%2", filename, error));
        }
    }
 
    static void JsonSaveFile(string filename, T data)
    {
        string file_content;
        if (!m_Serializer)
            m_Serializer = new JsonSerializer();
        
        m_Serializer.WriteToString(data, true, file_content);
        
        FileHandle handle = OpenFile(filename, FileMode.WRITE);
        if (handle == 0)
            return;
        
        FPrint(handle, file_content);
        CloseFile(handle);
    }
 
    static void JsonLoadData(string string_data, out T data)
    {
        string error;
        if (!m_Serializer)
            m_Serializer = new JsonSerializer();
        
        if (!m_Serializer.ReadFromString(data, string_data, error))
            ErrorEx(string.Format("Cannot load data %1", error));
    }
 
    static string JsonMakeData(T data)
    {
        string string_data;
        if (!m_Serializer)
            m_Serializer = new JsonSerializer();
        
        m_Serializer.WriteToString(data, true, string_data);
        return string_data;
    }
 
    //#endif
}