code: /* LanguageTool, a natural language style checker
   * Copyright (C) 2020 Daniel Naber (http://www.danielnaber.de)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
   * USA
   */
  package org.languagetool.dev;
  
  import org.languagetool.AnalyzedToken;
  import org.languagetool.language.GermanyGerman;
  import org.languagetool.synthesis.Synthesizer;
  
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Paths;
  import java.util.Arrays;
  import java.util.List;
  
  /**
   * Help finding old German spelling that lack their new version,
   * like "abschloß" without "abschloss".
   */
  public class GermanOldSpellingFinder {
  
    public static void main(String[] args) throws IOException {
      GermanyGerman lang = new GermanyGerman();
      Synthesizer synth = lang.getSynthesizer();
      List<String> words = Files.readAllLines(Paths.get(args[0]));
      int i = 0;
      for (String word : words) {
        if (i++ % 1000 == 0) {
          System.out.println(i + "...");
        }
        if (!word.matches("^[a-zöäü].*")) {
          continue;
        }
        String[] formsAr = synth.synthesize(new AnalyzedToken(word, "FAKE", word), ".*", true);
        List<String> forms = Arrays.asList(formsAr);
        for (String form : forms) {
          if (form.matches(".*oß") && !forms.contains(form.replaceFirst("ß", "ss"))) {
            System.out.println("No 'ss' form found: " + form);
          }
        }
      }
    }
  
    public static void main2(String[] args) throws IOException {
      GermanyGerman lang = new GermanyGerman();
      Synthesizer synth = lang.getSynthesizer();
      String tmpWord = "hintergießen";
      String[] formsAr = synth.synthesize(new AnalyzedToken(tmpWord, "FAKE", tmpWord), ".*", true);
      System.out.println(Arrays.toString(formsAr));
      System.exit(1);
    }
  }
  