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These are Java extensions for use with the DocBook XML stylesheets and the Saxon XSLT engine.
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package com.nwalsh.saxon;

import com.icl.saxon.om.NamePool;

/**
 * Saxon extension to count the lines in a result tree fragment.
 *
 * $Id: LineCountEmitter.java 8098 2008-08-03 13:27:07Z mzjn $
 *
 * Copyright (C) 2000 Norman Walsh.
 *
 * This class provides a
 * Saxon 6.*
 * implementation to count the number of lines in a result tree
 * fragment.
 *
 * The general design is this: the stylesheets construct a result tree
 * fragment for some verbatim environment. That result tree fragment
 * is "replayed" through the LineCountEmitter; the LineCountEmitter watches
 * characters go by and counts the number of line feeds that it sees.
 * That number is then returned.
 *
 * Change Log:
 * 
 * 1.0
 * Initial release.
 * 
 *
 * @see Verbatim
 *
 * @author Norman Walsh
 * [email protected]
 *
 * @version $Id: LineCountEmitter.java 8098 2008-08-03 13:27:07Z mzjn $
 *
 */
public class LineCountEmitter extends com.icl.saxon.output.Emitter {
  /** The number of lines seen. */
  protected int numLines = 0;

  /** Construct a new LineCountEmitter. */
  public LineCountEmitter() {
    numLines = 0;
  }

  /** Reset the number of lines. */
  public void reset() {
    numLines = 0;
  }

  /** Return the number of lines. */
  public int lineCount() {
    return numLines;
  }

  /** Process characters. */
  public void characters(char[] chars, int start, int len)
    throws javax.xml.transform.TransformerException {

    if (numLines == 0) {
      // If there are any characters at all, there's at least one line
      numLines++;
    }

    for (int count = start; count < start+len; count++) {
      if (chars[count] == '\n') {
	numLines++;
      }
    }
  }

  /** Discarded. */
  public void comment(char[] chars, int start, int length)
    throws javax.xml.transform.TransformerException {
    // nop
  }

  /** Discarded. */
  public void endDocument()
    throws javax.xml.transform.TransformerException {
    // nop
  }

  /** Discarded. */
  public void endElement(int nameCode)
    throws javax.xml.transform.TransformerException {
    // nop
  }

  /** Discarded. */
  public void processingInstruction(java.lang.String name,
				    java.lang.String data)
    throws javax.xml.transform.TransformerException {
    // nop
  }

  /** Discarded. */
  public void setDocumentLocator(org.xml.sax.Locator locator) {
    // nop
  }

  /** Discarded. */
  public void setEscaping(boolean escaping)
    throws javax.xml.transform.TransformerException {
    // nop
  }

  /** Discarded. */
  public void setNamePool(NamePool namePool) {
    // nop
  }

  /** Discarded. */
  public void setUnparsedEntity(java.lang.String name, java.lang.String uri)
    throws javax.xml.transform.TransformerException {
    // nop
  }

  /** Discarded. */
  public void setWriter(java.io.Writer writer) {
    // nop
  }

  /** Discarded. */
  public void startDocument()
    throws javax.xml.transform.TransformerException {
    // nop
  }

  /** Discarded. */
  public void startElement(int nameCode,
		    org.xml.sax.Attributes attributes,
		    int[] namespaces, int nscount)
    throws javax.xml.transform.TransformerException {
    // nop
  }
}