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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.trees.international.pennchinese;

import java.io.Reader;

import edu.stanford.nlp.trees.*;


/**
 * The {@code CTBTreeReaderFactory} is a factory for creating a
 * TreeReader suitable for the Penn Chinese Treebank (CTB).
 * It knows how to ignore the SGML tags in those files.
 * The default reader doesn't delete empty nodes, but an
 * additional static class is provided whose default constructor
 * does give a TreeReader that deletes empty nodes in trees.
 *
 * @author Christopher Manning
 */
public class CTBTreeReaderFactory implements TreeReaderFactory {

  private final TreeNormalizer tn;
  private final boolean discardFrags;

  public CTBTreeReaderFactory() {
    this(new TreeNormalizer());
  }

  public CTBTreeReaderFactory(TreeNormalizer tn) {
    this(tn, false);
  }

  public CTBTreeReaderFactory(TreeNormalizer tn, boolean discardFrags) {
    this.tn = tn;
    this.discardFrags = discardFrags;
  }

  /**
   * Create a new {@code TreeReader} using the provided
   * {@code Reader}.
   *
   * @param in The {@code Reader} to build on
   * @return The new TreeReader
   */
  @Override
  public TreeReader newTreeReader(Reader in) {
    if (discardFrags) {
      return new FragDiscardingPennTreeReader(in, new LabeledScoredTreeFactory(), tn, new CHTBTokenizer(in));
    } else {
      return new PennTreeReader(in, new LabeledScoredTreeFactory(), tn, new CHTBTokenizer(in));
    }
  }


  public static class NoEmptiesCTBTreeReaderFactory extends CTBTreeReaderFactory {

    public NoEmptiesCTBTreeReaderFactory() {
      super(new BobChrisTreeNormalizer());
    }

  } // end static class NoEmptiesCTBTreeReaderFactory

}