////////////////////////////////////////////////////////////////

//

//	strtok class

//

//	tokenizes a String object based on a String of separator characters.

//

//	Copyright (C) 2008 Michael V. Newberry. All Rights Reserved.

//

//	This copyright notice must be included in any portion of this source

//	code that is used in any form and for any purpose.

//



////////////////////////////////////////////////////////////////////////

function start()

{

	this.m_nOffset = 0;

	this.m_sToken = '';

}



///////////////////////////////////////////////////////////////////////

function init( sString )

{

	this.m_sString = sString;

	this.m_nOffset = 0;

	this.m_sToken = '';

}



///////////////////////////////////////////////////////////////////////

function next()

{

	this.m_sToken = '';



	// find beginning of token

	var begin = this.m_nOffset;

	while ( begin < this.m_sString.length )

	{

		if ( this.isDelimiter( this.m_sString.charAt(begin) ) == false )	

			break;

		begin++;

	}

	if ( begin == this.m_sString.length )

	{

		this.m_sToken = '';

		return this.m_sToken;

	}



	// look for end of token

	var end = begin;

	while ( end < this.m_sString.length )

	{

		if ( this.isDelimiter( this.m_sString.charAt(end) ) == true )

			break;

		end++;

	}



	this.m_nOffset = end;

	this.m_sToken = this.m_sString.substr( begin, end - begin );

	

	return this.m_sToken;

}



///////////////////////////////////////////////////////////////////////

function setDelimiter( sDelimiter )

{

	this.m_sDelimiter = sDelimiter;

}



///////////////////////////////////////////////////////////////////////

function isDelimiter( c )

{

	for ( var i = 0; i < this.m_sDelimiter.length; i++ )

	{

		if ( this.m_sDelimiter.charAt(i) == c )

			return true;

	}

	return false;

}



///////////////////////////////////////////////////////////////////////

function strtok( str, delimiter )

{

	this.m_sString = str;

	this.m_nOffset = 0;

	this.m_sDelimiter = delimiter;

	this.m_sToken = '';



	this.isDelimiter = isDelimiter;

	this.setDelimiter = setDelimiter;

	this.start = start;

	this.init = init;

	this.next = next;

}