public Parser(String in, Library lib) {
    // init TOKENIZER
    this.in = in;
    read();

    // init PARSER
    this.lib=lib;
    paramOPs=new Stack<OP>();
    xchgOP=new Stack<OP>();
    
    // initialize DV names accumulator
    if (lib.resolver!=null)
      accDV=new StringBuffer();
  };