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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.ling.tokensregex;

import java.util.function.Predicate;

import java.util.Arrays;
import java.util.List;

/**
 * Performs action on a sequence
 *
 * @author Angel Chang
 */
public interface SequenceMatchAction {
  public SequenceMatchResult apply(SequenceMatchResult matchResult, int... groups);

  public final static class BoundAction {
    SequenceMatchAction action;
    int[] groups;

    public SequenceMatchResult apply(SequenceMatchResult seqMatchResult) {
      return action.apply(seqMatchResult, groups);
    }
  }

  public final static class StartMatchAction implements SequenceMatchAction {
    SequencePattern pattern;

    public StartMatchAction(SequencePattern pattern) {
      this.pattern = pattern;
    }

    public SequenceMatchResult apply(SequenceMatchResult seqMatchResult, int... groups) {
      SequenceMatcher matcher = pattern.getMatcher(seqMatchResult.elements());
      if (matcher.find()) {
        return matcher;
      } else {
        return null;
      }
    }
  }

  public final static class NextMatchAction implements SequenceMatchAction {
    public SequenceMatchResult apply(SequenceMatchResult seqMatchResult, int... groups) {
      if (seqMatchResult instanceof SequenceMatcher) {
        SequenceMatcher matcher = (SequenceMatcher) seqMatchResult;
        if (matcher.find()) {
          return matcher;
        } else {
          return null;
        }
      } else {
        return null;
      }
    }
  }

  public final static class BranchAction implements SequenceMatchAction {
    Predicate> filter;
    SequenceMatchAction acceptBranch;
    SequenceMatchAction rejectBranch;

    public BranchAction(Predicate> filter, SequenceMatchAction acceptBranch, SequenceMatchAction rejectBranch) {
      this.filter = filter;
      this.acceptBranch = acceptBranch;
      this.rejectBranch = rejectBranch;
    }

    public SequenceMatchResult apply(SequenceMatchResult seqMatchResult, int... groups) {
      if (filter.test(seqMatchResult)) {
        return (acceptBranch != null)? acceptBranch.apply(seqMatchResult):null;
      } else {
        return (rejectBranch != null)? rejectBranch.apply(seqMatchResult):null;
      }
    }
  }

  public final static class SeriesAction implements SequenceMatchAction {
    List> actions;

    public SeriesAction(SequenceMatchAction... actions) {
      this.actions = Arrays.asList(actions);
    }

    public SeriesAction(List> actions) {
      this.actions = actions;
    }

    public SequenceMatchResult apply(SequenceMatchResult seqMatchResult, int... groups) {
      SequenceMatchResult res = seqMatchResult;
      for (SequenceMatchAction a:actions) {
        res = a.apply(res, groups);
      }
      return res;
    }
  }

}