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.rules.pt;
  
  import java.io.IOException;
  import java.util.Map;
  
  import org.languagetool.AnalyzedToken;
  import org.languagetool.AnalyzedTokenReadings;
  import org.languagetool.Language;
  import org.languagetool.language.Portuguese;
  import org.languagetool.rules.RuleMatch;
  import org.languagetool.rules.patterns.RuleFilter;
  import org.languagetool.synthesis.pt.PortugueseSynthesizer;
  import org.languagetool.tools.StringTools;
  
  public class RegularIrregularParticipleFilter extends RuleFilter {
  
    private Language language = new Portuguese();
    private PortugueseSynthesizer synth = (PortugueseSynthesizer) language.getSynthesizer();
  
    @Override
    public RuleMatch acceptRuleMatch(RuleMatch match, Map<String, String> arguments, int patternTokenPos,
        AnalyzedTokenReadings[] patternTokens) throws IOException {
  
      String direction = getRequired("direction", arguments); // RegularToIrregular or IrregularToRegular
      AnalyzedTokenReadings atr = null;
      for (AnalyzedTokenReadings token : patternTokens) {
        if (token.getStartPos() == match.getFromPos()) {
          atr = token;
          break;
        }
      }
      String replacement = null;
      if (atr.hasPosTagStartingWith("VMP")) {
        AnalyzedToken selectedAT = null;
        String desiredPostag = null;
        for (AnalyzedToken at : atr) {
          if (at.getPOSTag() != null && at.getPOSTag().startsWith("VMP")) {
            selectedAT = at;
            desiredPostag = at.getPOSTag();
          }
        }
        // assente SC assentado SM
        if (desiredPostag.endsWith("C")) {
          desiredPostag = desiredPostag.substring(0,desiredPostag.length() - 1) + "[MC]";
        } else {
          desiredPostag = desiredPostag.substring(0,desiredPostag.length() - 1) 
              + "["+ desiredPostag.substring(desiredPostag.length() - 1) + "C]";
        }
        
        String[] participles;
        try {
          participles = synth.synthesize(selectedAT, desiredPostag, true);
        } catch (IOException e) {
          throw new IOException("Cannot synthesize " + selectedAT.toString() + e);
        }
        if (participles != null && participles.length > 1) {
          if (direction.equalsIgnoreCase("RegularToIrregular") && isRegular(atr.getToken())) {
            if (!isRegular(participles[0])) {
              replacement = participles[0];
            } else if (!isRegular(participles[1])) {
              replacement = participles[1];
            }
          } else if (direction.equalsIgnoreCase("IrregularToRegular") && !isRegular(atr.getToken())) {
            if (isRegular(participles[0])) {
              replacement = participles[0];
            } else if (isRegular(participles[1])) {
              replacement = participles[1];
            }
          }
          if (replacement != null) {
            String message = match.getMessage();
            RuleMatch ruleMatch = new RuleMatch(match.getRule(), match.getSentence(), match.getFromPos(),
                match.getToPos(), message, match.getShortMessage());
            ruleMatch.setType(match.getType());
            String suggestion = match.getSuggestedReplacements().get(0).replace("{suggestion}", replacement);
            suggestion = suggestion.replace("{Suggestion}", StringTools.uppercaseFirstChar(replacement));
            suggestion = suggestion.replace("{SUGGESTION}", replacement.toUpperCase());
            ruleMatch.setSuggestedReplacement(suggestion);
            return ruleMatch;
          }
        }
      }
      return null;
    }
  
    boolean isRegular(String p) {
      String lp = p.toLowerCase();
      return lp.endsWith("do") || lp.endsWith("dos") || lp.endsWith("da") || lp.endsWith("das");
    }
  }
  