static class LOneWordChanged extends LearnerImpl {

  static boolean debug;

  Function preprocessor; // e.g. JavaTok

  List<String> lastIn; // only while learning

  String lastOut; // only while learning

  int index;

  String outPattern;

  *(Function *preprocessor) {}

  public void processInOut(Object _in, Object _out) {

    if (debug)

      System.out.println("LOneWordChanged: i/o " + _in + " " + _out);

    String in = (String) _in, out = (String) _out;

    List<String> l = (List<String>) preprocessor.process(_in);

    lastIn = l;

    lastOut = out;

  }

  public Object processIn(Object _in) {

    if (debug)

      System.out.println("LOneWordChanged: i " + _in);

    List<String> l = (List<String>) preprocessor.process(_in);

    if (outPattern == null) {

      if (l.size() != lastIn.size()) fail();

      for (int i = 0; i < l.size(); i++)

        if (!l.get(i).equals(lastIn.get(i))) {

          index = i;

          String word = lastIn.get(index);

          outPattern = lastOut.replace(word, "{*}");

          // delete learning data

          lastIn = null;

          lastOut = null;

          break;

        }

      if (outPattern == null) {

        if (debug)

          System.out.println("LOneWordChanged: last=" + lastIn + ", this=" + l);

        fail("not applicable - all words identical");

      }

    }

    if (debug)

      System.out.println("LOneWordChanged: index=" + index + ", outPattern=" + quote(outPattern));

    String word = l.get(index);

    return outPattern.replace("{*}", word);

  }

  static List<Integer> getFindMarkers2(String s) {

    List<Integer> l = new ArrayList<Integer>();

    int i = 0;

    while (i < s.length()) {

      int j = s.indexOf("[[", i);

      if (j < 0) break;

      int k = s.indexOf("]]", j+2);

      if (k < 0) break;

      l.add(j);

      l.add(k+2);

      i = k+2;

    }

    return l;

  }

  static List<String> getMarked(String s) {

    List<Integer> l = getFindMarkers2(s);

    new List<String> result;

    for (int i = 0; i < l.size(); i += 2)

      result.add(s.substring(l.get(i)+2, l.get(i+1)-2));

    return result;

  }

  public void toJava(Code code) {

    preprocessor.toJava_process(code);

    String word = code.list() + ".get(" + index + ")";

    if (outPattern.equals("{*}"))

      code.assign(word);

    else

      code.assign(javaQuote(outPattern) + ".replace(" + javaQuote("{*}") + ", (String) (" + word + "))");

  }

}