nl_tokens: for 2 . 0a< = or 2 . 0a = or 2 . 0a > =
pl_tokens: function ( result , exp ) { switch ( exp . op ) { case '<' : <mask> '<=' : result . lower = exp ; break ; case '>' : case '>=' : result . upper = exp ; break ; case '=' : case '==' : result . midle = exp ; break ; } delete exp . op ; }