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Stanford CoreNLP provides a set of natural language analysis tools which can take raw English language text input and give the base forms of words, their parts of speech, whether they are names of companies, people, etc., normalize dates, times, and numeric quantities, mark up the structure of sentences in terms of phrases and word dependencies, and indicate which noun phrases refer to the same entities. It provides the foundational building blocks for higher level text understanding applications.

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package edu.stanford.nlp.ie.machinereading.domains.ace.reader;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import javax.xml.parsers.ParserConfigurationException;

import org.xml.sax.SAXException;

import edu.stanford.nlp.ie.machinereading.common.DomReader;
import edu.stanford.nlp.ie.machinereading.domains.ace.reader.RobustTokenizer.WordToken;
import edu.stanford.nlp.io.IOUtils;
import edu.stanford.nlp.ling.Word;
import edu.stanford.nlp.util.Generics;

public class AceSentenceSegmenter extends DomReader {
  // list of tokens which mark sentence boundaries
  private final static String[] sentenceFinalPunc = new String[] { ".", "!",
      "?" };
  private static Set sentenceFinalPuncSet = Generics.newHashSet();

  static {
    // set up sentenceFinalPuncSet
    for (String aSentenceFinalPunc : sentenceFinalPunc) sentenceFinalPuncSet.add(aSentenceFinalPunc);
  }

  /**
   * @param filenamePrefix
   *          path to an ACE .sgm file (but not including the .sgm extension)
   */
  public static List> tokenizeAndSegmentSentences(String filenamePrefix)
      throws IOException, SAXException, ParserConfigurationException {

    List> sentences = new ArrayList<>();
    File inputFile = new File(filenamePrefix + AceDocument.ORIG_EXT);
    String input  =IOUtils.slurpFile(inputFile);

    // now we can split the text into tokens
    RobustTokenizer tokenizer = new RobustTokenizer<>(input);
    List tokenList = tokenizer.tokenizeToWordTokens();

    // and group the tokens into sentences
    ArrayList currentSentence = new ArrayList<>();
    int quoteCount = 0;
    for (int i = 0; i < tokenList.size(); i ++){
      WordToken token = tokenList.get(i);
      String tokenText = token.getWord();
      AceToken convertedToken = wordTokenToAceToken(token, sentences.size());

      // start a new sentence if we skipped 2+ lines (after datelines, etc.)
      // or we hit some SGML
      // if (token.getNewLineCount() > 1 || AceToken.isSgml(tokenText)) {
      if(AceToken.isSgml(tokenText)) {
        if (currentSentence.size() > 0) sentences.add(currentSentence);
        currentSentence = new ArrayList<>();
        quoteCount = 0;
      }

      currentSentence.add(convertedToken);
      if(tokenText.equals("\"")) quoteCount ++;

      // start a new sentence whenever we hit sentence-final punctuation
      if (sentenceFinalPuncSet.contains(tokenText)){
        // include quotes after EOS
        if(i < tokenList.size() - 1 && quoteCount % 2 == 1 && tokenList.get(i + 1).getWord().equals("\"")){
          AceToken quoteToken = wordTokenToAceToken(tokenList.get(i + 1), sentences.size());
          currentSentence.add(quoteToken);
          quoteCount ++;
          i ++;
        }
        if (currentSentence.size() > 0) sentences.add(currentSentence);
        currentSentence = new ArrayList<>();
        quoteCount = 0;
      }
      
      // start a new sentence when we hit an SGML tag
      else if(AceToken.isSgml(tokenText)) {
        if (currentSentence.size() > 0) sentences.add(currentSentence);
        currentSentence = new ArrayList<>();
        quoteCount = 0;
      }
    }
    
    return sentences;
  }

  public static AceToken wordTokenToAceToken(WordToken wordToken, int sentence) {
    return new AceToken(wordToken.getWord(), "", "", "", "", Integer
        .toString(wordToken.getStart()), Integer.toString(wordToken.getEnd()),
        sentence);
  }
  
  // simple testing code
  public static void main(String[] args) throws IOException, SAXException,
      ParserConfigurationException {
    String testFilename = "/home/mcclosky/data/ACE2005/English/wl/timex2norm/AGGRESSIVEVOICEDAILY_20041101.1144";
    // testFilename =
    // "/home/mcclosky/data/ACE2005/English/bc/timex2norm/CNN_CF_20030303.1900.02";
    // testFilename =
    // "/home/mcclosky/data/ACE2005/English/un/timex2norm/alt.atheism_20041104.2428";
    testFilename = "/home/mcclosky/data/ACE2005/English/nw/timex2norm/AFP_ENG_20030502.0614";
    
    List> sentences = tokenizeAndSegmentSentences(testFilename);
    for (List sentence : sentences)
      System.out.println("s: [" + sentence + "]");
  }
}