code: function(name, value){
      var needGenLexer = false;
      if(typeof name === "object"){
        for(var i in name){
          // if you config
          if( i ==="END" || i==='BEGIN' )  needGenLexer = true;
          config[i] = name[i];
        }
      }
      if(needGenLexer) Lexer.setup();
    }
docs: config the Regularjs's global