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/*
 * Distributed as part of mchange-commons-java v.0.2.3
 *
 * Copyright (C) 2012 Machinery For Change, Inc.
 *
 * Author: Steve Waldman 
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 2.1, as 
 * published by the Free Software Foundation.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this software; see the file LICENSE.  If not, write to the
 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 */


package com.mchange.util.impl;

import java.util.*;
import com.mchange.util.*;

public class QuotesAndWhitespaceTokenizer extends StringEnumerationHelperBase
{
  Object     current;
  LinkedList list = new LinkedList();

  public QuotesAndWhitespaceTokenizer(String string) throws IllegalArgumentException
    {
      int i = 0;
      int len = string.length();
      while (i < len)
	{
	  int q = string.indexOf ('"', i);
	  if (q >= 0)
	    {
	      StringTokenizer toks = new StringTokenizer(string.substring(i, q));
	      if (toks.hasMoreTokens()) list.add(toks);
	      int q2 = string.indexOf('"', q + 1);
	      if (q2 == -1)
		throw new IllegalArgumentException("Badly quoted string: " + string);
	      list.add(string.substring(q + 1, q2));
	      i = q2 + 1;
	    }
	  else
	    {
	      StringTokenizer toks = new StringTokenizer(string.substring(i));
	      if (toks.hasMoreTokens()) list.add(toks);
	      break;
	    }
	}
      advance();
    }

  public synchronized boolean hasMoreStrings()
    {return current != null;}

  public synchronized String nextString()
    {
      if (current instanceof String)
	{
	  String out = (String) current;
	  advance();
	  return out;
	}
      else
	{
	  StringTokenizer toks = (StringTokenizer) current;
	  String out = toks.nextToken();
	  if (!toks.hasMoreTokens()) advance();
	  return out;
	}
    }

  private void advance()
    {
      if (list.isEmpty())
	current = null;
      else
	{
	  current = list.getFirst();
	  list.removeFirst();
	}
    }

  public static void main(String[] argv)
    {
      String test = "\t  \n\r";
      //String test = "This is \"only a\" frigging \t\"test\".";
      for (StringEnumeration se = new QuotesAndWhitespaceTokenizer(test); se.hasMoreStrings();)
	System.out.println(se.nextString());
    }
}