lib/parser.js
function(n) {
    var la = this.lookahead(n).type;
    switch (la) {
      case 'for':
        return this.bracketed;
      case '[':
        this.bracketed = true;
        return true;
      case ']':
        this.bracketed = false;
        return true;
      default:
        return ~selectorTokens.indexOf(la);
    }
  }
function(n) {
    var la = this.lookahead(n).type;
    switch (la) {
      case 'for':
        return this.bracketed;
      case '[':
        this.bracketed = true;
        return true;
      case ']':
        this.bracketed = false;
        return true;
      default:
        return ~selectorTokens.indexOf(la);
    }
  }
function ( n ) { var la = this . lookahead ( n ) . type ; switch ( la ) { case 'for' : return this . bracketed ; case '[' : this . bracketed = true ; return true ; case ']' : this . bracketed = false ; return true ; default : return ~ selectorTokens . indexOf ( la ) ; } }
Check if the token at `n` is a valid selector token.

@param {Number} n
@return {Boolean}
@api private
Check if the token at n is a valid selector token .