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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) 2014 Daniel Naber (http://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.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.ResourceBundle;
import org.languagetool.AnalyzedSentence;
import org.languagetool.AnalyzedTokenReadings;
import org.languagetool.Language;
import org.languagetool.tools.Tools;

/**
 * A rule that checks for empty lines. Useful especially for office extension
 * It checks only linebreaks because empty paragraphs can't be handled in LO/OO 
 * 
 * @author Fred Kruse
 */

public class EmptyLineRule extends TextLevelRule {

  private final Language lang;
  
  public EmptyLineRule(ResourceBundle messages, Language lang, boolean defaultActive) {
    super(messages);
    super.setCategory(Categories.STYLE.getCategory(messages));
    this.lang = lang;
    if (!defaultActive) {
      setDefaultOff();
    }
    setOfficeDefaultOn();  // Default for LO/OO is always On
    setLocQualityIssueType(ITSIssueType.Style);
  }

  public EmptyLineRule(ResourceBundle messages, Language lang) {
    this(messages, lang, false);
  }

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

  @Override
  public String getDescription() {
    return messages.getString("empty_line_rule_desc");
  }

  @Override
  public org.languagetool.rules.RuleMatch[] match(List sentences) throws IOException {
    List ruleMatches = new ArrayList<>();
    int pos = 0;
    for (int n = 0; n < sentences.size() - 1; n++) {
      AnalyzedSentence sentence = sentences.get(n);
      if(Tools.isParagraphEnd(sentences, n, lang)) {
        if(isSecondParagraphEndMark(sentence.getText())) {
          AnalyzedTokenReadings[] tokens = sentence.getTokensWithoutWhitespace();
          if(tokens.length > 1) {
            int fromPos = pos + tokens[tokens.length - 1].getStartPos();
            int toPos = pos + tokens[tokens.length - 1].getEndPos();
            RuleMatch ruleMatch = new RuleMatch(this, sentence, fromPos, toPos, messages.getString("empty_line_rule_msg"));
            // Can't use SuggestedReplacement because of problems in LO/OO dialog with linebreaks
            ruleMatches.add(ruleMatch);
          }
        }
      }
      pos += sentence.getCorrectedTextLength();
    }
    return toRuleMatchArray(ruleMatches);
  }

  private boolean isSecondParagraphEndMark(String sentence) {
    if (lang.getSentenceTokenizer().singleLineBreaksMarksPara()) {
      if (sentence.endsWith("\n\n") || sentence.endsWith("\n\r\n\r")) {
        return true;
      }
    } else { 
      if (sentence.endsWith("\n\n\n\n") || sentence.endsWith("\n\r\n\r\n\r\n\r") || sentence.endsWith("\r\n\r\n\r\n\r\n")) {
        return true;
      }
    }
    return false;
  }
  
  @Override
  public int minToCheckParagraph() {
    return 1;
  }

}