AjScript.Language.StringObject.Substr C# (CSharp) Метод

        private static object Substr(IContext context, object @this, object[] arguments)
        {
            string str = (string)@this;

            int from = 0;
            int? length = null;

            if (arguments.Length > 0)
                try
                {
                    from = Convert.ToInt32(arguments[0]);
                }
                catch
                {
                }

            if (arguments.Length > 1)
                try
                {
                    length = Convert.ToInt32(arguments[1]);
                }
                catch
                {
                }

            if (from >= str.Length)
                return string.Empty;

            if (from < 0)
            {
                from = str.Length + from;
                if (from < 0)
                    from = 0;
            }

            if (length.HasValue)
            {
                if (length.Value <= 0)
                    return string.Empty;

                return str.Substring(from, length.Value);
            }

            return str.Substring(from);
        }