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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.tregex.tsurgeon;

import java.util.Map;

import edu.stanford.nlp.trees.tregex.TregexMatcher;
import edu.stanford.nlp.trees.Tree;

/**
 * @author Roger Levy ([email protected])
 */
class CoindexNodes extends TsurgeonPattern {

  private static final String coindexationIntroductionString = "-";

  public CoindexNodes(TsurgeonPattern[] children) {
    super("coindex", children);
  }

  @Override
  protected void setRoot(TsurgeonPatternRoot root) {
    super.setRoot(root);
    root.setCoindexes();
  }

  @Override
  public TsurgeonMatcher matcher(Map newNodeNames, CoindexationGenerator coindexer) {
    return new Matcher(newNodeNames, coindexer);
  }

  private class Matcher extends TsurgeonMatcher {
    public Matcher(Map newNodeNames, CoindexationGenerator coindexer) {
      super(CoindexNodes.this, newNodeNames, coindexer);
    }

    @Override
    public Tree evaluate(Tree tree, TregexMatcher tregex) {
      int newIndex = coindexer.generateIndex();
      for(TsurgeonMatcher child : childMatcher) {
        Tree node = child.evaluate(tree, tregex);
        node.label().setValue(node.label().value() + coindexationIntroductionString + newIndex);
      }
      return tree;
    }
  }
}