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JavaCC is a parser/scanner generator for Java.
There is a newer version: 7.0.13
PARSER_BEGIN(PetalParser)
package cb.parser;

import cb.petal.*;
import java.io.*;
import java.util.ArrayList;
import java.util.Stack;

/**
 * Parser for Rational Rose Petal files.
 *
 * @version $Id: PetalParser.jj,v 1.11 2001/06/18 15:20:05 dahm Exp $
 * @author  M. Dahm
 */
public class PetalParser {
  private static PetalNode current_parent = null;
  private static Stack parent_stack = new Stack(); // Stack

  private static PetalParser instance;
  private static ObjectFactory factory = ObjectFactory.getInstance();

  public static PetalFile parse(String file_name)
    throws IOException, ParseException
  {
    return parse(new FileInputStream(file_name));
  }

  public static PetalFile parse(java.net.URL url)
    throws IOException, ParseException
  {
    return parse(url.openStream());
  }

  public static PetalFile parse(File file)
    throws IOException, ParseException
  {
    return parse(new FileInputStream(file));
  }

  public static PetalFile parse(InputStream stream) throws ParseException {
    if(instance == null)
      instance = new PetalParser(stream);
    else
      instance.ReInit(stream);

    return instance.parse();
  }

  private static void saveParent(PetalNode new_parent) {
    parent_stack.push(current_parent);
    current_parent = new_parent;
  }

  private static void restoreParent() {
    current_parent = (PetalNode)parent_stack.pop();
  }

}
PARSER_END(PetalParser)

 SKIP : /* WHITE SPACE */
{
  " " | "\t" | "\f"
}

/* \r and \n are not just skipped because they may be significant
 * in recognizing multi-line strings (starting with |)
 */
SPECIAL_TOKEN : {  |  }

/** Top level construct are always petal and design objects
 */
PetalFile parse() :
{
  PetalObject petal, design;
  PetalFile file = new PetalFile();
  current_parent = file;
}
{
  petal  = parseObject()
  design = parseObject()
  {
    file.setPetal((Petal)petal);
    file.setDesign((Design)design);
    return file;
  }
}

/* Example: (object ClassView "Class" "Use Case View::Student" @76	
 *             location   	(160, 176))
 */
PetalObject parseObject() :
{
  PetalObject obj;
  ArrayList   docs = new ArrayList();
  Token       t1, t2=null, t3=null, t4=null;
  PetalNode prop;
}
{
  /* Object header
   */
  "(object" t1 =  
    (t2 =  { docs.add(t2.image); })*
    [t3 = ] {
      obj = factory.createObject(current_parent, t1.image, docs,
				 t3 == null? null : t3.image);
      saveParent(obj);
    }

  /* List of properties
   */
  (t4   = 
   prop = parseValue()
   { obj.addProperty(t4.image, prop); })*
  
  ")"
  {
    restoreParent();
    obj.init();
    return obj;
  }
}

PetalNode parseValue() :
{
  PetalNode p;
}
{
   ( (p = parseObject())
   | (p = parseList()) 
   | LOOKAHEAD(2) (p = parseLiteral())
   | (p = parseTuple())
   | (p = parseValueObject()))
   {
     return p; 
   }
}

/* Example: (list unit_reference_list (object Module_Diagram "Main"
 *		quid       	"35CB163B03CF"))
 *
 */
List parseList() :
{
  List      list;
  Token     t=null;
  PetalNode obj;
}
{
  "(list" [t = ] {
    list = factory.createList(t == null ? null : t.image);
  }

  (obj = parseValue() { list.add(obj); })*
  ")"
  {
    return list;
  }
}

Value parseValueObject() :
{
  StringLiteral str;
  Token         t1;
  Value         value;
}
{
  "(value" t1 =  str = parseString() ")"
  {
    value = factory.createValue(t1.image, str);
    return value;
  }
}

Tuple parseTuple() :
{
  Token t1, t2;
}
{
  "(" t1 =  t2 =  ")"
  {
    return factory.createTuple(t1.image, t2.image);
  }
}

PetalNode parseLiteral() :
{
  Token t, t1, t2;
  StringLiteral str;
}
{
  str = parseString()  { return str; }
|
  t =  { return factory.createInteger(t.image); }
|
  t =    { return factory.createFloat(t.image); }
|
  t =  { return factory.createBoolean(t.image); }
|
  t =    { return factory.createTag(t.image); }
|
  "(" t1 =  "," t2 =  ")"
  {
    return factory.createLocation(t1.image, t2.image);
  }
}

StringLiteral parseString() :
{
  Token t;
}
{
  t =  { return factory.createString(t.image, false); }
| 
  t =  { return factory.createString(t.image, true); }
}

TOKEN : /* LITERALS */
{
  < INTEGER:     ()+ >
|
  < FLOAT:       ()+ "." ()* >
|
  < BOOLEAN:    ("FALSE" | "TRUE") >
|
  < IDENTIFIER:  (|)* >
|
  < TAG:      "@" ()+ >
|
  < STRING: ("\"") ()* ("\"") >
|
  /* Parse special case, like in:
   * (value Text 
   * |// $package
   * |#include "$file"
   * |
   * )
   */
  < MULTI_STRING: ("|" ()* (|))+ >
|
  < #IN_STRING: ((~["\"","\\","\n","\r"])
        | ("\\"
            ( ["n","t","b","r","f","\\","'","\""]
            | ["0"-"7"] ( ["0"-"7"] )?
            | ["0"-"3"] ["0"-"7"] ["0"-"7"]
            )
          )
      ) >
|
  < #LETTER:    [ "a"-"z", "A"-"Z", "_", "$" ] >
|
  < #ANY:    ~["\n","\r"] >
|
  < #DIGIT:     [ "0"-"9"] >
|
  < #PLUSMINUS: (["+", "-"])? >
}