code: function() {
      var tok = this.stash[this.stash.length - 1] || this.prev;
      switch (tok && tok.type) {
        // #for
        case 'color':
          return 2 == tok.val.raw.length;
        // .or
        case '.':
        // [is]
        case '[':
          return true;
      }
      return false;
    }
docs: Check if the current token is a part of selector.
  
  @return {Boolean}
  @api private