/* FPAE_Scanner_Tester.java
** Author: R. McCloskey
** Date: February 2020
** This Java application is for the purpose of testing instances of the
** FPAE_Scanner class.  The user is asked to enter an FPAE and, in response,
** the program lists the tokens in that FPAE, as produced by consecutive 
** calls to the next() method of an instance of FPAE_Scanner that had
** been constructed using that FPAE.  Note that it is not necessary for 
** the user to enter a well-formed FPAE; any string containing only
** characters that would be expected to appear in an FPAE (parentheses,
** operator symbols, digits, and spaces) would be fine.
** This behavior repeats until the user enters an empty string.
** 
*/
import java.util.Scanner;

public class FPAE_Scanner_Tester {

   public static void main(String[] args) {
      Scanner keyboard = new Scanner(System.in);
      String expr = "glorp";
      while (expr.length() != 0) {
         System.out.print("\nEnter an FPAE: ");
         expr = keyboard.nextLine();
         FPAE_Scanner fpaeScanner = new FPAE_Scanner(expr);
         System.out.println("Tokens are as follows:");
         int cntr = 0;
         while (fpaeScanner.hasNext()) {
            cntr = cntr + 1;
            String nextToken = fpaeScanner.next();
            System.out.printf("Token #%d: |%s|\n", cntr, nextToken);
         }
         System.out.printf("%d tokens found.\n", cntr);
      }
      System.out.println("\nGoodbye."); 
   }
}