//$Id: ctype.js,v 1.3 2001/05/24 18:50:45 pdwivedi Exp $
//$Source: /bbsrc/web/jscommon/ctype.js,v $
//	Contains various functions for determining various things about characters

function isdigit(txt) {
	if (txt >= '0' && txt <= '9') {
		return true
	}else{
		return false
	}
}

function isnumber(txt) {
	len = txt.length
	if (len == 0) {
		return false
	}
	for (i = 0; i < txt.length; i++) {
		if (isdigit(txt.substring(i, i + 1)) == false) {
			return false
		}
	}
	return true
}

function isspace(txt) {
	if (txt == ' ') {
		return true
	}else{
		return false
	}
}

function isblank(txt) {
	len = txt.length
	if (len == 0) {
		return true
	}
	for (i = 0; i < txt.length; i++) {
		if (isspace(txt.substring(i, i + 1)) == false) {
			return false
		}
	}
	return true
}

function hasblank(txt) {
	len = txt.length
	if (len == 0) {
		return false
	}
	for (i = 0; i < txt.length; i++) {
		if (isspace(txt.substring(i, i + 1)) == true) {
			return true
		}
	}
	return false
}

function isalpha(txt) {
	if (txt >= 'a' && txt <= 'z') {
		return true
	}
	if (txt >= 'A' && txt <= 'Z') {
		return true
	}
	return false
}

function isalphanum(txt) {
	if ((isalpha(txt) == false) && (isdigit(txt) == false)) {
		return false
	}else{
		return true
	}
}
		
function isemail(txt) {
	// format must be string0@string1.string2
	var string_ct_arr = new Array(0,0,0)
	if (isblank(txt) == true) {
		return false
	}
	if (hasblank(txt) == true) {
		return false
	}
	if (isalphanum(txt.substring(0, 1)) == false) {
		return false
	}

	arr_idx = 0;
	for (i = 0; i < txt.length; i++) {
		if (txt.substring(i, i + 1) == '@') {
			arr_idx = 1
			continue
		}
		if (txt.substring(i, i + 1) == '.') {
			if (arr_idx == 1) {
				// only want to treat . as a separator if already seen @;
				// this covers john.smith@aol.com
				arr_idx = 2
				continue
			}
		}
		string_ct_arr[arr_idx]++
	}
	for (i = 0; i <= 2; i++) {
		if (string_ct_arr[i] == 0) {
			return false
		}
	}
	return true
}

function isvalidticker(txt) {
	len = txt.length

	if( len == 0  || txt == 'Enter Symbol')
		return false

	firstchar = txt.substring( 0, 1);
	if( isspace( firstchar ) || ( !isalphanum( firstchar ) && firstchar != '^' ))
		return false
	return true
}