scalar_group    : SCALAR
                        | scalar_group SCALAR

def p_scalar_group(self, p):
        """
        scalar_group    : SCALAR
                        | scalar_group SCALAR
        """
        if len(p) == 2:
            p[0] = (str(p[1]),)

        if len(p) == 3:
            p[0] = p[1] + (str(p[2]),)

        if len(p) == 4:
            p[0] = p[1] + (str(p[3]),)