code: /* LanguageTool, a natural language style checker 
   * Copyright (C) 2021 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.patterns;
  
  import java.io.IOException;
  import java.util.Map;
  
  import org.languagetool.AnalyzedTokenReadings;
  import org.languagetool.rules.RuleMatch;
  
  public class ApostropheTypeFilter extends RuleFilter {
  
    @Override
    public RuleMatch acceptRuleMatch(RuleMatch match, Map<String, String> arguments, int patternTokenPos,
        AnalyzedTokenReadings[] patternTokens) throws IOException {
      String wordFrom = getRequired("wordFrom", arguments);
      boolean hasTypographicalApostrophe = getRequired("hasTypographicalApostrophe", arguments).equalsIgnoreCase("true");
      if (wordFrom != null) {
        int posWord = 0;
        if (wordFrom.equals("marker")) {
          while (posWord < patternTokens.length && patternTokens[posWord].getStartPos() < match.getFromPos()) {
            posWord++;
          }
          posWord++;
        } else {
          posWord = Integer.parseInt(wordFrom);
        }
        if (posWord < 1 || posWord > patternTokens.length) {
          throw new IllegalArgumentException("ApostropheTypeFilter: Index out of bounds in "
              + match.getRule().getFullId() + ", wordFrom: " + posWord);
        }
        AnalyzedTokenReadings atrWord = patternTokens[posWord - 1];
        if (hasTypographicalApostrophe == atrWord.hasTypographicApostrophe()) {
          return match;
        }
      }
      return null;
    }
  
  }
  