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JavaCC is a parser/scanner generator for Java.
There is a newer version: 7.0.13
/* Copyright (c) 2006, Sun Microsystems, Inc.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Sun Microsystems, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */


PARSER_BEGIN(Faq)

import java.io.*;

public class Faq {

  static int count = 0;

  static int beginAt = 1;

  static PrintWriter indstr;

  static {
    try {
      indstr = new PrintWriter(new FileWriter("index.html"));
      indstr.println("Selected list of emails from the JavaCC mailing list");
      indstr.println("Selected list of emails from the JavaCC mailing list");
    } catch (IOException e) {
      throw new Error();
    }
  }

  static String fix(String s) {
    String retval = "";
    for (int i = 0; i < s.length(); i++) {
      char c = s.charAt(i);
      if (c == '<') {
        retval += "<";
      } else if (c == '>') {
        retval += ">";
      } else {
        retval += c;
      }
    }
    return retval;
  }

  public static void main(String args[]) throws ParseException {
    if (args.length == 1) {
      beginAt = Integer.parseInt(args[0]);
    }
    Faq parser = new Faq(System.in);
    parser.MailFile();
  }

}

PARSER_END(Faq)


// PARSER SPECIFICATIONS BEGIN HERE

void MailFile() :
	{
	}
{
  (
	{
	  count++;
	}
    MailMessage()
	{
	  System.out.print(count + ".");
	  System.out.flush();
	}
  )*
  
	{
	  System.out.println("");
	  indstr.close();
	}
}

void MailMessage() :
	{
	  PrintWriter msgstr = null;
	  Token subj=null, from=null, date=null, body;
	  if (count >= beginAt) {
	    try {
	      msgstr = new PrintWriter(new FileWriter(count + ".html"));
	    } catch (IOException e) {
	      throw new Error();
	    }
	  }
	}
{
  ( subj= | from= | date= )+
	{
	  indstr.print("");
	  if (subj == null) {
	    indstr.println("no subject
");
	  } else {
	    indstr.println(fix(subj.image) + "
");
	  }
	  if (count >= beginAt) {
	    msgstr.println("" + ((subj==null) ? "no subject" : fix(subj.image)) + "");
	    msgstr.println("Subject: " + ((subj==null) ? "no subject" : fix(subj.image)) + "
");
	    msgstr.println("From: " + ((from==null) ? "" : fix(from.image)) + "
");
	    msgstr.println("Date: " + ((date==null) ? "" : fix(date.image)) + "
");
            msgstr.println("
");
	  }
	}
  ( body=
	{
	  if (count >= beginAt) {
	    msgstr.print(fix(body.image) + "
");
	  }
	}
  )*
  
	{
	  if (count >= beginAt) {
	    msgstr.close();
	  }
	}
}


// LEXICAL SPECIFICATIONS BEGIN HERE

TOKEN:
{
  <#EOL: "\n" | "\r" | "\r\n">
|
  <#TWOEOLS: (("\n"|"\r\n") ) | ("\r\r" [ "\n" ])>
|
  <#NOT_EOL: ~["\n","\r"]>
}


SKIP:
{
  <  "*** EOOH ***"  > : MAILHEADER
|
  <~[]>
}


SKIP:
{
  <_TWOEOLS: > : MAILBODY
    // We cannot have just a reference to a regular expression in a
    // lexical specification - i.e., we cannot simply have .
|
  "Subject: " : MAILSUBJECT
|
  "From: " : MAILFROM
|
  "Date: " : MAILDATE
|
  <~[]>
}


TOKEN:
{
   )+>
}


SKIP:
{
  <_EOL1: > : MAILHEADER
}


TOKEN:
{
   )+>
}


SKIP:
{
  <_EOL2: > : MAILHEADER
}


TOKEN:
{
   )+>
}


SKIP:
{
  <_EOL3: > : MAILHEADER
}


TOKEN:
{
  >
|
   : DEFAULT
}