internal StyleValueImporter()
 {
     m_Context   = null;
     m_AssetPath = null;
     m_Parser    = new Parser();
     m_Builder   = new StyleSheetBuilder();
     m_Errors    = new StyleSheetImportErrors();
     m_Validator = new StyleValidator();
 }
        public StyleValueImporter(UnityEditor.AssetImporters.AssetImportContext context)
        {
            if (context == null)
            {
                throw new ArgumentNullException(nameof(context));
            }

            m_Context   = context;
            m_AssetPath = context.assetPath;
            m_Parser    = new Parser();
            m_Builder   = new StyleSheetBuilder();
            m_Errors    = new StyleSheetImportErrors();
            m_Validator = new StyleValidator();
        }