commands.txt

Global Jflex: jflex Java.flex
Local Jflex jar file: java -jar jflex-full-1.8.2.jar Java.flex

java -jar java-cup-11b.jar java12.cup

In generated "Scanner.java" file edit as follow:

import java_cup.runtime.*;
import java.util.Iterator;
import java.util.ArrayList;
import java.util.List;

@SuppressWarnings("FallThrough")
public class Scanner extends sym implements java_cup.runtime.Scanner {
  public List<Integer> loopContainer = new ArrayList<Integer>();
  
  ...
  
case 78: {
   loopContainer.add(zzCurrentPos - loopContainer.get(loopContainer.size() - 1));
   return symbol(END);
}

case 105: {
   loopContainer.add(zzCurrentPos + 5);
   return symbol(BEGIN);
}


Then:
javac -cp .;java-cup-11b-runtime.jar Scanner.java sym.java JavaSymbol.java parser.java TestLexer.java UnicodeEscapes.java JavaParser.java

java -cp .;java-cup-11b-runtime.jar Scanner sample.in
java -cp .;java-cup-11b-runtime.jar JavaParser sample.in