ParenToken(int type,
    Token tok,
    int paren) 
{
              
            super(type);
            this.child = tok;
            this.parennumber = paren;
}

 Token getChild(int index) 
{
            return this.child;
}

 int getParenNumber() 
{
            return this.parennumber;
}

 int size() 
{
            return 1;
}

 public String toString(int options) 
{
            String ret = null;
            switch (this.type) {
              case PAREN:
                if (this.parennumber == 0) {
                    ret = "(?:"+this.child.toString(options)+")";
                } else {
                    ret = "("+this.child.toString(options)+")";
                }
                break;
              case LOOKAHEAD:
                ret = "(?="+this.child.toString(options)+")";
                break;
              case NEGATIVELOOKAHEAD:
                ret = "(?!"+this.child.toString(options)+")";
                break;
              case LOOKBEHIND:
                ret = "(?< ="+this.child.toString(options)+")";
                break;
              case NEGATIVELOOKBEHIND:
                ret = "(?< !"+this.child.toString(options)+")";
                break;
              case INDEPENDENT:
                ret = "(? >"+this.child.toString(options)+")";
                break;
            }
            return ret;
}