Tup.Cobar4Net.Parser.Recognizer.Mysql.Syntax.MySqlExprParser.UnaryOpExpression C# (CSharp) Method

        private IExpression UnaryOpExpression(string consumed
                                              , string consumedUp)
        {
            if (consumed == null)
            {
                IExpression expr;
                switch (lexer.Token())
                {
                    case MySqlToken.OpExclamation:
                    {
                        lexer.NextToken();
                        expr = UnaryOpExpression(null, null);
                        return new NegativeValueExpression(expr).SetCacheEvalRst(cacheEvalRst);
                    }

                    case MySqlToken.OpPlus:
                    {
                        lexer.NextToken();
                        return UnaryOpExpression(null, null);
                    }

                    case MySqlToken.OpMinus:
                    {
                        lexer.NextToken();
                        expr = UnaryOpExpression(null, null);
                        return new MinusExpression(expr).SetCacheEvalRst(cacheEvalRst);
                    }

                    case MySqlToken.OpTilde:
                    {
                        lexer.NextToken();
                        expr = UnaryOpExpression(null, null);
                        return new BitInvertExpression(expr).SetCacheEvalRst(cacheEvalRst);
                    }

                    case MySqlToken.KwBinary:
                    {
                        lexer.NextToken();
                        expr = UnaryOpExpression(null, null);
                        return new CastBinaryExpression(expr).SetCacheEvalRst(cacheEvalRst);
                    }
                }
            }
            return CollateExpression(consumed, consumedUp);
        }