gt: 					status = peekStatus(statusStack);
context: // see http://www.apache.org/licenses/LICENSE-2.0
  
  /*
   * $Id: JSONParser.java,v 1.1 2006/04/15 14:10:48 platform Exp $
   * Created on 2006-4-15
   */
  package org.teiid.json.simple;
  
  import java.io.IOException;
  import java.io.Reader;
  import java.io.StringReader;
  import java.io.Writer;
  import java.util.LinkedList;
  
  
  /**
   * Parser for JSON text. Please note that JSONParser is NOT thread-safe.
   * 
   * @author FangYidong<fangyidong@yahoo.com.cn>
   */
  public class JSONParser {
  	
      /**
       * Modified from JSONValue 
       * @param s - Must not be null.
       * @param sb
       * @throws IOException 
       */
      public static void escape(CharSequence s, Writer sb) throws IOException {
                  for(int i=0;i<s.length();i++){
                          char ch=s.charAt(i);
                          switch(ch){
                          case '"':
                                  sb.append("\\\"");  //$NON-NLS-1$
                                  break;
                          case '\\':
                                  sb.append("\\\\"); //$NON-NLS-1$
                                  break;
                          case '\b':
                                  sb.append("\\b"); //$NON-NLS-1$
                                  break;
                          case '\f':
                                  sb.append("\\f"); //$NON-NLS-1$
                                  break;
                          case '\n':
                                  sb.append("\\n"); //$NON-NLS-1$
                                  break;
                          case '\r':
                                  sb.append("\\r"); //$NON-NLS-1$
                                  break;
                          case '\t':
                                  sb.append("\\t"); //$NON-NLS-1$
                                  break;
                          case '/':
                                  sb.append("\\/"); //$NON-NLS-1$
                                  break;
                          default:
                  //Reference: http://www.unicode.org/versions/Unicode5.1.0/
                                  if((ch>='\u0000' && ch<='\u001F') || (ch>='\u007F' && ch<='\u009F') || (ch>='\u2000' && ch<='\u20FF')){
                                          String ss=Integer.toHexString(ch);
                                          sb.append("\\u");
                                          for(int k=0;k<4-ss.length();k++){
                                                  sb.append('0');
                                          }
                                          sb.append(ss.toUpperCase());
                                  }
                                  else{
                                          sb.append(ch);
                                  }
                          }
                  }//for
          }
  	
  	public static final int S_INIT=0;
  	public static final int S_IN_FINISHED_VALUE=1;//string,number,boolean,null,object,array
  	public static final int S_IN_OBJECT=2;
  	public static final int S_IN_ARRAY=3;
  	public static final int S_PASSED_PAIR_KEY=4;
  	public static final int S_IN_PAIR_VALUE=5;
  	public static final int S_END=6;
  	public static final int S_IN_ERROR=-1;
  	
  	private LinkedList handlerStatusStack;
  	private Yylex lexer = new Yylex((Reader)null);
  	private Yytoken token = null;
  	private int status = S_INIT;
  	
  	private int peekStatus(LinkedList statusStack){
  		if(statusStack.size()==0)
  			return -1;
  		Integer status=(Integer)statusStack.getFirst();
  		return status.intValue();
  	}
  	
      /**
       *  Reset the parser to the initial state without resetting the underlying reader.
       *
       */
      public void reset(){
          token = null;
          status = S_INIT;
          handlerStatusStack = null;
      }
      
      /**
       * Reset the parser to the initial state with a new character reader.
       * 
       * @param in - The new character reader.
       * @throws IOException
       * @throws ParseException
       */
  	public void reset(Reader in){
  		lexer.yyreset(in);
  		reset();
  	}
  	
  	/**
  	 * @return The position of the beginning of the current token.
  	 */
  	public int getPosition(){
  		return lexer.getPosition();
  	}
  	
  	private void nextToken() throws ParseException, IOException{
  		token = lexer.yylex();
  		if(token == null)
  			token = new Yytoken(Yytoken.TYPE_EOF, null);
  	}
  	
  	public void parse(String s, ContentHandler contentHandler) throws ParseException{
  		parse(s, contentHandler, false);
  	}
  	
  	public void parse(String s, ContentHandler contentHandler, boolean isResume) throws ParseException{
  		StringReader in=new StringReader(s);
  		try{
  			parse(in, contentHandler, isResume);
  		}
  		catch(IOException ie){
  			/*
  			 * Actually it will never happen.
  			 */
  			throw new ParseException(-1, ParseException.ERROR_UNEXPECTED_EXCEPTION, ie);
  		}
  	}
  	
  	public void parse(Reader in, ContentHandler contentHandler) throws IOException, ParseException{
  		parse(in, contentHandler, false);
  	}
  	
  	/**
  	 * Stream processing of JSON text.
  	 * 
  	 * @see ContentHandler
  	 * 
  	 * @param in
  	 * @param contentHandler
  	 * @param isResume - Indicates if it continues previous parsing operation.
       *                   If set to true, resume parsing the old stream, and parameter 'in' will be ignored. 
  	 *                   If this method is called for the first time in this instance, isResume will be ignored.
  	 * 
  	 * @throws IOException
  	 * @throws ParseException
  	 */
  	public void parse(Reader in, ContentHandler contentHandler, boolean isResume) throws IOException, ParseException{
  		if(!isResume){
  			reset(in);
  			handlerStatusStack = new LinkedList();
  		}
  		else{
  			if(handlerStatusStack == null){
  				isResume = false;
  				reset(in);
  				handlerStatusStack = new LinkedList();
  			}
  		}
  		
  		LinkedList statusStack = handlerStatusStack;	
  		
  		try{
  			do{
  				switch(status){
  				case S_INIT:
  					contentHandler.startJSON();
  					nextToken();
  					switch(token.type){
  					case Yytoken.TYPE_VALUE:
  						status=S_IN_FINISHED_VALUE;
  						statusStack.addFirst(new Integer(status));
  						if(!contentHandler.primitive(token.value))
  							return;
  						break;
  					case Yytoken.TYPE_LEFT_BRACE:
  						status=S_IN_OBJECT;
  						statusStack.addFirst(new Integer(status));
  						if(!contentHandler.startObject())
  							return;
  						break;
  					case Yytoken.TYPE_LEFT_SQUARE:
  						status=S_IN_ARRAY;
  						statusStack.addFirst(new Integer(status));
  						if(!contentHandler.startArray())
  							return;
  						break;
  					default:
  						status=S_IN_ERROR;
  					}//inner switch
  					break;
  					
  				case S_IN_FINISHED_VALUE:
  					nextToken();
  					if(token.type==Yytoken.TYPE_EOF){
  						contentHandler.endJSON();
  						status = S_END;
  						return;
  					}
  					else{
  						status = S_IN_ERROR;
  						throw new ParseException(getPosition(), ParseException.ERROR_UNEXPECTED_TOKEN, token);
  					}
  			
  				case S_IN_OBJECT:
  					nextToken();
  					switch(token.type){
  					case Yytoken.TYPE_COMMA:
  						break;
  					case Yytoken.TYPE_VALUE:
  						if(token.value instanceof String){
  							String key=(String)token.value;
  							status=S_PASSED_PAIR_KEY;
  							statusStack.addFirst(new Integer(status));
  							if(!contentHandler.startObjectEntry(key))
  								return;
  						}
  						else{
  							status=S_IN_ERROR;
  						}
  						break;
  					case Yytoken.TYPE_RIGHT_BRACE:
  						if(statusStack.size()>1){
  							statusStack.removeFirst();
  							status=peekStatus(statusStack);
  						}
  						else{
  							status=S_IN_FINISHED_VALUE;
  						}
  						if(!contentHandler.endObject())
  							return;
  						break;
  					default:
  						status=S_IN_ERROR;
  						break;
  					}//inner switch
  					break;
  					
  				case S_PASSED_PAIR_KEY:
  					nextToken();
  					switch(token.type){
  					case Yytoken.TYPE_COLON:
  						break;
  					case Yytoken.TYPE_VALUE:
  						statusStack.removeFirst();
  						status=peekStatus(statusStack);
  						if(!contentHandler.primitive(token.value))
  							return;
  						if(!contentHandler.endObjectEntry())
  							return;
  						break;
  					case Yytoken.TYPE_LEFT_SQUARE:
  						statusStack.removeFirst();
  						statusStack.addFirst(new Integer(S_IN_PAIR_VALUE));
  						status=S_IN_ARRAY;
  						statusStack.addFirst(new Integer(status));
  						if(!contentHandler.startArray())
  							return;
  						break;
  					case Yytoken.TYPE_LEFT_BRACE:
  						statusStack.removeFirst();
  						statusStack.addFirst(new Integer(S_IN_PAIR_VALUE));
  						status=S_IN_OBJECT;
  						statusStack.addFirst(new Integer(status));
  						if(!contentHandler.startObject())
  							return;
  						break;
  					default:
  						status=S_IN_ERROR;
  					}
  					break;
  				
  				case S_IN_PAIR_VALUE:
  					/*
  					 * S_IN_PAIR_VALUE is just a marker to indicate the end of an object entry, it doesn't proccess any token,
  					 * therefore delay consuming token until next round.
  					 */
  					statusStack.removeFirst();
  