// $Id: ctype.js,v 1.4 2002/02/20 18:42:46 nwiggins Exp $ 
// $Log: ctype.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 1.1 2001/05/21 15:53:53 jneil 
// Initial Upload. 
// 
// 
/********************************************************************** Depends on: isEmpty(), isWhitespace() functions string.js library NOTE: -- always alltrim field value before calling any of these functions -- if field is empty, the function call will return true **********************************************************************/ 
// isDigit: check if val has digits (0-9) 
function isDigit(val) { 
	var strBuffer = new String(val); 
	var nPos = 0; 
	if (isEmpty(strBuffer)) return false; 
	for (nPos = 0; nPos < strBuffer.length; nPos++) if (strBuffer.charAt(nPos) < '0' || strBuffer.charAt(nPos) > '9') return false; 
	return true; 
} 
// isAlpha: check if val has alphabets only (a-z, A-Z) 
function isAlpha(val) { 
	var strBuffer = new String(val); 
	var nPos = 0; 
	if (isEmpty(strBuffer)) return false; 
	for (nPos = 0; nPos < strBuffer.length; nPos++) 
	if (!((strBuffer.charAt(nPos) >= 'a' && strBuffer.charAt(nPos) <= 'z') || (strBuffer.charAt(nPos) >= 'A' && strBuffer.charAt(nPos) <= 'Z'))) return false; 
	return true; 
} 
//isInteger: check if nVal is integer type 
function isInteger(nVal) { 
	var strBuffer = new String(nVal); 
	var nPos = 0, nStart = 0; 
	if (isEmpty(strBuffer)) return true; 
	if (isWhitespace(strBuffer)) return false; 
	//check if -ve or +ve sign occurs in the beginning 
	if ((strBuffer.charAt(0) == '-') || (strBuffer.charAt(0) == '+')) nStart = 1; 
	else nStart = 0; 
	for (nPos = nStart; nPos < strBuffer.length; nPos++) if (strBuffer.charAt(nPos) < '0' || strBuffer.charAt(nPos) > '9') return false; 
	return true; 
} 
//isFloat: check if fVal is floating-point type 
// LIMITATION: no scientific notation (for eg: xxxx.xxE+xx) 
function isFloat(fVal) { 
	var strBuffer = new String(fVal); 
	var nPos = 0, nStart = 0; 
	if (isEmpty(strBuffer)) return true; 
	if (isWhitespace(strBuffer)) return false; 
	//check if -ve or +ve sign occurs in the beginning 
	if ((strBuffer.charAt(0) == '-') || (strBuffer.charAt(0) == '+')) nStart = 1; 
	else nStart = 0; 
	for (nPos = nStart; nPos < strBuffer.length; nPos++) if ((strBuffer.charAt(nPos) < '0' || strBuffer.charAt(nPos) > '9') && (strBuffer.charAt(nPos) != '.')) return false; 
	return true; 
} 
/************************************************************ isDate : Check if dVal is valid date : valid date format - MM (or) M / DD (or) D / Y (or) YY (or) YYYY : YY > 50 should be 19YY : YY <= 50 should be 20YY *************************************************************/ 
function isDate(dVal) { 
	var strBuffer= new String(dVal); 
	var cDelimiter=''; 
	var strMonth=0, strDay=0, strYear=0; 
	var nPos=-1; 
	if (isEmpty(strBuffer)) return true; 
	if (isWhitespace(strBuffer)) return false; 
	// Get the delimiter used 
	if (occurs('/', strBuffer) == 2) cDelimiter = '/'; 
	else if (occurs('-', strBuffer) == 2) cDelimiter = '-'; 
	// If no '/' or '-' found return false 
	if (cDelimiter == '') return false; 
	// validate month, date, and year (Y, YY, YYYY are valid year formats) 
	nPos = strBuffer.indexOf(cDelimiter); 
	strMonth = strBuffer.substring(0, nPos); 
	if (strMonth.length > 2 || !isDigit(strMonth)) return false; 
	strBuffer = strBuffer.substring(nPos+1); 
	nPos = strBuffer.indexOf(cDelimiter); 
	strDay = strBuffer.substring(0, nPos); 
	if (strDay.length > 2 || !isDigit(strDay)) return false; 
	strBuffer = strBuffer.substring(nPos+1); 
	strYear = strBuffer; 
	if ((strYear.length > 4) || (strYear.length == 3) || !isDigit(strYear)) return false; 
	// if YY < 50 then YYYY=20YY; else if YY >= 50 then YYYY=19YY;		
	var iYear = parseInt(strYear); 
	if (iYear < 50) strYear = "20" + (strYear < 10 ? '0' + strYear:strYear); 
	else if (iYear >= 50 && iYear < 100) strYear = "19" + strYear; strBuffer = strMonth + cDelimiter + strDay + cDelimiter + strYear; 
	// validate date 
	var dBuffer = new Date(strBuffer); 
	if (dBuffer.getDate() != parseInt(strDay) || dBuffer.getMonth()+1 != parseInt(strMonth) || dBuffer.getFullYear() != parseInt(strYear)) return false; 
	return true; 
} 
// isZipcode: check if valid US zip code (##### or #####-####) 
function isZipcode(strZip) { 
	var strLeft="", strRight="", strVal = new String(strZip); 
	if (isEmpty(strVal)) return true; 
	if (isWhitespace(strVal)) return false; 
	if (strVal.length != 5 && strVal.length != 10) return false; 
	if ((strVal.length == 5) && isDigit(strVal)) return true; 
	if ((strVal.length == 10) && isDigit(strVal.substring(0, 5)) && isDigit(strVal.substring(6))) return true; 
	return false; 
} 
// isDatePart: check if nVal is valid day: 1-31, month:1-12, year:YYYY 
function isDatePart(nVal, strType) { 
	var strBuffer = new String(nVal); 
	if (isEmpty(strBuffer) || isWhitespace(strBuffer)) return false; 
	nVal = parseInt(strBuffer); 
	if (!isDigit(nVal)) return false; 
	if ((strType == "Year") && (nVal < 0 || (nVal > 99 && nVal < 1000) || nVal > 9999)) return false; 
	else if ((strType == "Month") && (nVal < 1 || nVal > 12)) return false; 
	else if ((strType == "Day") && (nVal < 1 || nVal > 31)) return false; 
	return true; 
}