// $Id: string.js,v 1.4 2002/02/20 18:42:46 nwiggins Exp $ 
// 
// $Log: string.js,v $ 
// Revision 1.4 2002/02/20 18:42:46 nwiggins 
// 
// # removes script tags - forces usage as a javascript src include. no php includes 
// 
// Revision 1.3 2001/07/18 23:07:57 jneil 
// Fixed some problems. 
// 
// Revision 1.2 2001/07/02 06:11:18 vhegde 
// Revision 1.1 2001/05/21 15:53:53 jneil 
// Initial Upload. 
// 
// 
// whitespace characters: ' ', '\t', '\r', '\n' 
var whitespace = " \t\n\r"; 
// isEmpty: Check whether string strVal is empty 
function isEmpty(strVal) { 
	return ((strVal == null) || (strVal.length == 0)); 
} 
//isWhitespace: Check if string strVal has only the whitespace characters 
function isWhitespace(strVal) { 
	var nPos = 0; 
	if (isEmpty(strVal)) return false; 
	for (nPos = 0; nPos < strVal.length; nPos++) if (whitespace.indexOf(strVal.charAt(nPos)) == -1) return false; 
	return true; 
} 
//rtrim: Right trim the string and return the trimmed value 
function rtrim(strVal) { 
	var nPos = 0; 
	if (isEmpty(strVal)) return strVal; 
	for (nPos = strVal.length-1; nPos >= 0; nPos--) { 
		if (whitespace.indexOf(strVal.charAt(nPos)) == -1) break; 
	} 
	return (nPos == strVal.length-1 ? strVal.substring(0) : strVal.substring(0, nPos+1)); 
} 
//ltrim: Left trim the string and return the trimmed value 
function ltrim(strVal) { 
	var nPos = 0; 
	if (isEmpty(strVal)) return strVal; 
	for (nPos = 0; nPos < strVal.length; nPos++) { 
		if (whitespace.indexOf(strVal.charAt(nPos)) == -1) break; 
	} 
	return strVal.substring(nPos); 
} 
//alltrim: Trim the string on left and right, and return the trimmed value 
function alltrim(strVal) { 
	return (isEmpty(strVal) ? strVal:ltrim(rtrim(strVal))); 
} 
/******************************************************** replace: useful for JavaScript 1.0 and 1.1 where replace is not available. With JavaScript 1.2 (and above) replace function is available. : replaces one occurrence of strVal with strWith in strSrc ********************************************************/ 
function replace(strSrc, strVal, strWith) { 
	var nPos = 0, strLeft="", strRight=""; 
	//check if empty (or) no string is found to replace 
	if (isEmpty(strSrc) || (strSrc.indexOf(strVal) < 0)) return strSrc; 
	nPos = strSrc.indexOf(strVal); 
	strLeft = strSrc.substring(0, nPos); 
	nPos += strVal.length; 
	strRight = strSrc.substring(nPos); 
	return (strLeft + strWith + strRight); 
} 
//replaceall : replace all occurrences of strVal with strWith in strSrc 
function replaceall(strSrc, strVal, strWith) { 
	var strBuffer=strSrc; 
	while (strBuffer.indexOf(strVal) >= 0) strBuffer = replace(strBuffer, strVal, strWith); 
	return (strBuffer); 
} 
//occurs: return no of occurrences of strVal within strSrc 
function occurs(strVal, strSrc) { 
	var nCnt = 0, strBuffer=strSrc; 
	while (strBuffer.indexOf(strVal) >= 0) { 
		strBuffer = replace(strBuffer, strVal, ""); 
		nCnt++; 
	} 
	return (nCnt); 
} 
//replicate: returns string that contains strVal repeated nCnt times 
function replicate(strVal, nCnt) { 
	var i = 0, strBuffer = ""; 
	for (i = 0; i < nCnt; i++) strBuffer += strVal; 
	return (strBuffer); 
} 
/************************************************************** stuff: returns string after replacing nCnt characters (starting from nStartPos) with strReplacement in strSrc. NOTE: starting position is 0 **************************************************************/ 
function stuff(strSrc, nStartPos, nCnt, strReplacement) { 
	var strLeft= "", strRight=""; 
	//check boundary values 
	if (nCnt < 0 || nStartPos < 0 || (nStartPos > strSrc.length-1)) return strSrc; 
	strLeft = strSrc.substring(0, nStartPos); 
	strRight = strSrc.substring(nStartPos+nCnt); 
	return (strLeft + strReplacement + strRight); 
}