// ******************************************************
// Checks if the given string (DateString) is a well
// formatted date string or not
// ******************************************************
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
  var i;

  for (i = 0; i < s.length; i++){   
    // Check that current character is number.
    var c = s.charAt(i);
    if (((c < "0") || (c > "9"))) return false;
  }

  // All characters are numbers.
  return true;
}

function stripCharsInBag(s, bag){
  var i;
  var returnString = "";

  // Search through string's characters one by one.
  // If character is not in bag, append to returnString.
  for (i = 0; i < s.length; i++){   
    var c = s.charAt(i);
    if (bag.indexOf(c) == -1) returnString += c;
  }
  return returnString;
}

function daysInFebruary (year){
  // February has 29 days in any year evenly divisible by four,
  // EXCEPT for centurial years which are not also divisible by 400.
  return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}

function DaysArray(n) {
  for (var i = 1; i <= n; i++) {
    this[i] = 31
    if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
    if (i==2) {this[i] = 29}
  } 

  return this
}

function Check_Date(dtStr){
  if (dtStr != "") {
    var daysInMonth = DaysArray(12)
    var pos1=dtStr.indexOf(dtCh)
    var pos2=dtStr.indexOf(dtCh,pos1+1)
    var strDay=dtStr.substring(0,pos1)
    var strMonth=dtStr.substring(pos1+1,pos2)
    var strYear=dtStr.substring(pos2+1)
    strYr=strYear

    if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
    if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)

    for (var i = 1; i <= 3; i++) {
      if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
    }

    now=new Date();
    month=parseInt(strMonth);
    day=parseInt(strDay);
    year=parseInt(strYr);

    if (pos1==-1 || pos2==-1){
      return false
    }
    if (strMonth.length<1 || month<1 || month>12){
      return false
    }
    if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
      return false
    }
    if (strYear.length == 2){
      if ((2000 + year) > now.getYear ()) {
        strYear = "19" + strYear;
        year = 1900 + year;
      }
      else {
        strYear = "20" + strYear;
        year = 2000 + year;
      }
    }
    if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
      return false
    }
    if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
      return false
    }

    return true
  }
}

function AmericanDate (dtStr) {
  if (dtStr != "") {
    var daysInMonth = DaysArray(12)
    var pos1=dtStr.indexOf(dtCh)
    var pos2=dtStr.indexOf(dtCh,pos1+1)
    var strDay=dtStr.substring(0,pos1)
    var strMonth=dtStr.substring(pos1+1,pos2)
    var strYear=dtStr.substring(pos2+1)
    strYr=strYear
    if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
    if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)

    for (var i = 1; i <= 3; i++) {
      if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
    }

    now=new Date();
    month=parseInt(strMonth);
    day=parseInt(strDay);
    year=parseInt(strYr);
    if (year < 2000) {
      year = year + 2000;
    }
    tIsoDate = month + "/" + day + "/" + year;
    return tIsoDate
  }
  return ""
}

// ******************************************************
// Checks if the given string is empty
// ******************************************************
function IsEmpty (Txt) {
  VarTxt = Txt;
  myRegExp = new RegExp(" ", "gi");
  result = VarTxt.replace(myRegExp, "");
  if (result.length == 0) {
    return true 
  } else {
    return false
  }
}

// ******************************************************
// Checks email syntax OLD VERSION
// ******************************************************
function CheckEmail2(Param) {
  var testresults
  var str = Param
  var filter = /^\w+((-\w+)|(\.\w+))*\@((?:\w+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
  if ((filter.test(str)) || (str.length == 0)) {
    testresults = true
  } else {
    testresults = false
  }
  return (testresults)
}

// ******************************************************
// Checks email syntax NEW VERSION
// ******************************************************
function CheckEmail (emailStr) {

/* The following variable tells the rest of the function whether or not
to verify that the address ends in a two-letter country or well-known
TLD.  1 means check it, 0 means don't. */

var checkTLD=1;

/* The following is the list of known TLDs that an e-mail address must end with. */

var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;

/* The following pattern is used to check if the entered e-mail address
fits the user@domain format.  It also is used to separate the username
from the domain. */

var emailPat=/^(.+)@(.+)$/;

/* The following string represents the pattern for matching all special
characters.  We don't want to allow special characters in the address. 
These characters include ( ) < > @ , ; : \ " . [ ] */

var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";

/* The following string represents the range of characters allowed in a 
username or domainname.  It really states which chars aren't allowed.*/

var validChars="\[^\\s" + specialChars + "\]";

/* The following pattern applies if the "user" is a quoted string (in
which case, there are no rules about which characters are allowed
and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
is a legal e-mail address. */

var quotedUser="(\"[^\"]*\")";

/* The following pattern applies for domains that are IP addresses,
rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
e-mail address. NOTE: The square brackets are required. */

var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;

/* The following string represents an atom (basically a series of non-special characters.) */

var atom=validChars + '+';

/* The following string represents one word in the typical username.
For example, in john.doe@somewhere.com, john and doe are words.
Basically, a word is either an atom or quoted string. */

var word="(" + atom + "|" + quotedUser + ")";

// The following pattern describes the structure of the user

var userPat=new RegExp("^" + word + "(\\." + word + ")*$");

/* The following pattern describes the structure of a normal symbolic
domain, as opposed to ipDomainPat, shown above. */

var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");

/* Finally, let's start trying to figure out if the supplied address is valid. */

/* Begin with the coarse pattern to simply break up user@domain into
different pieces that are easy to analyze. */

var matchArray=emailStr.match(emailPat);

if (matchArray==null) {

/* Too many/few @'s or something; basically, this address doesn't
even fit the general mould of a valid e-mail address. */

//alert("Email address seems incorrect (check @ and .'s)");
return false;
}
var user=matchArray[1];
var domain=matchArray[2];

// Start by checking that only basic ASCII characters are in the strings (0-127).

for (i=0; i<user.length; i++) {
if (user.charCodeAt(i)>127) {
//alert("Ths username contains invalid characters.");
return false;
   }
}
for (i=0; i<domain.length; i++) {
if (domain.charCodeAt(i)>127) {
//alert("Ths domain name contains invalid characters.");
return false;
   }
}

// See if "user" is valid 

if (user.match(userPat)==null) {

// user is not valid

//alert("The username doesn't seem to be valid.");
return false;
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
host name) make sure the IP address is valid. */

var IPArray=domain.match(ipDomainPat);
if (IPArray!=null) {

// this is an IP address

for (var i=1;i<=4;i++) {
if (IPArray[i]>255) {
//alert("Destination IP address is invalid!");
return false;
   }
}
return true;
}

// Domain is symbolic name.  Check if it's valid.
 
var atomPat=new RegExp("^" + atom + "$");
var domArr=domain.split(".");
var len=domArr.length;
for (i=0;i<len;i++) {
if (domArr[i].search(atomPat)==-1) {
//alert("The domain name does not seem to be valid.");
return false;
   }
}

/* domain name seems valid, but now make sure that it ends in a
known top-level domain (like com, edu, gov) or a two-letter word,
representing country (uk, nl), and that there's a hostname preceding 
the domain or country. */

if (checkTLD && domArr[domArr.length-1].length!=2 && 
domArr[domArr.length-1].search(knownDomsPat)==-1) {
//alert("The address must end in a well-known domain or two letter " + "country.");
return false;
}

// Make sure there's a host name preceding the domain.

if (len<2) {
//alert("This address is missing a hostname!");
return false;
}

// If we've gotten this far, everything's valid!
return true;
}

// ******************************************************
// Checks if str can be converted to a number
// ******************************************************
// Attention, probleme si le nombre = 0; 0 est considere comme false
function IsNumeric (str) {
  p       = ',';
  valeur  = str.replace(p, '\.');
  return Number(valeur);
}
// Meme probleme avec 0
function IsPositive (str) {
  p       = ',';
  valeur  = str.replace(p, '\.');
  x       = Number(valeur);
  if (x < 0) x = 0;
  return x;
}
// Renvoie le nombre + 1 si positif ou egal a 0, renvoie 0 si negatif
function IsNumeric2 (str) {
  p       = ',';
  valeur  = str.replace(p, '\.');
  x       = Number(valeur);
  if (x < 0) {
    x = 0;
  } else {
	x = x + 1;
  }
  return x;
}

// Renvoie la longueur du string
function lenString (str) {
  x = str.length;
  return x;
}