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LanguageTool is an Open Source proofreading software for English, French, German, Polish, Romanian, and more than 20 other languages. It finds many errors that a simple spell checker cannot detect like mixing up there/their and it detects some grammar problems.

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/* LanguageTool, a natural language style checker 
 * Copyright (C) 2005 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;

import java.util.ArrayList;
import java.util.List;
import java.util.ResourceBundle;

import org.languagetool.AnalyzedSentence;
import org.languagetool.AnalyzedTokenReadings;

/**
 * A rule that matches "..", "::", "-," but not "...", "!..", "?!!", ",-" etc.
 * Languages will have to subclass it and override isPunctsJoinOk()
 * and isPunctuation() to provide language-specific checking
 * 
 * @author Andriy Rysin
 */
public abstract class AbstractPunctuationCheckRule extends Rule {

  public AbstractPunctuationCheckRule(ResourceBundle messages) {
    super(messages);
    super.setCategory(Categories.PUNCTUATION.getCategory(messages));
  }

  @Override
  public String getId() {
    return "PUNCTUATION_GENERIC_CHECK";
  }

  @Override
  public String getDescription() {
    return "Use of unusual combination of punctuation characters";
  }

  protected abstract boolean isPunctsJoinOk(String tokens);

  protected abstract boolean isPunctuation(String token);

  @Override
  public RuleMatch[] match(AnalyzedSentence sentence) {
    List ruleMatches = new ArrayList<>();
    AnalyzedTokenReadings[] tokens = sentence.getTokens();

    int startTokenIdx = -1;
    String tkns = "";
    for (int i = 0; i < tokens.length; i++) {
      String tokenStr = tokens[i].getToken();

      if (isPunctuation(tokenStr)) {
        tkns += tokenStr;
        if (startTokenIdx == -1) {
          startTokenIdx = i;
        }
        if (i < tokens.length - 1) {
          continue;
        }
      }

      if (tkns.length() >= 2 && !isPunctsJoinOk(tkns)) {
        String msg = "bad duplication or combination of punctuation signs";
        RuleMatch ruleMatch = new RuleMatch(this, sentence, tokens[startTokenIdx].getStartPos(),
            tokens[startTokenIdx].getStartPos() + tkns.length(), msg,
            "Punctuation problem");
        ruleMatch.setSuggestedReplacement(tkns.substring(0, 1));
        ruleMatches.add(ruleMatch);
      }
      tkns = "";
      startTokenIdx = -1;
    }

    return toRuleMatchArray(ruleMatches);
  }

}