/****************************************************************************
 * browserSniffer.js
 * This file defines a class that parses the navigator.userAgent which gives
 * all of the client browser information.  It gives access to the browser type
 * (ex. Netscape), browser version (major and minor...4.79), and
 * the platform (mac, pc, etc.). 
 ***************************************************************************/

//========
// Class
//========
/**
 * Its
 * Purpose:		Retrieve client browser information.
 * 
 */
function its() {
  var n = navigator;
  // string comparisons are much easier if we lowercase everything now.
  // to make indexOf() tests more compact/readable, we prepend a space 
  // to the userAgent string (to get around '-1' indexOf() comparison)
  var ua = ' ' + n.userAgent.toLowerCase();
  var pl = n.platform.toLowerCase(); // not supported in NS3.0
  var an = n.appName.toLowerCase();

  // browser version
  this.version = n.appVersion;
		  
  this.nn = ua.indexOf('mozilla') > 0;

  // 'compatible' versions of mozilla aren't navigator
  if(ua.indexOf('compatible') > 0) {
    this.nn = false;
  }

  this.opera = ua.indexOf('opera') > 0;
  this.webtv = ua.indexOf('webtv') > 0;
  this.ie = ua.indexOf('msie') > 0;
  this.aol = ua.indexOf('aol') > 0;
  this.omniweb = ua.indexOf('omniweb') > 0;
  this.galeon = ua.indexOf('galeon') > 0;
		  
  this.major = parseInt( this.version );
  this.minor = parseFloat( this.version );
		  
  // platform
  this.mac = ua.indexOf('mac') > 0;
  this.mac68k = (ua.indexOf('68k') > 0
   || ua.indexOf('68000') > 0);
  this.macppc = (ua.indexOf('ppc') > 0
   || ua.indexOf('powerpc') > 0);

  this.win = ua.indexOf('win') > 0;
  this.win16 = (ua.indexOf('16') > 0
   && ua.indexOf('win') > 0);
  this.win31 = this.win16;
  this.win95 = (ua.indexOf('95') > 0
   && ua.indexOf('win') > 0);
  this.win98 = (ua.indexOf('98') > 0
   && ua.indexOf('win') > 0);
  this.winme = (ua.indexOf('win 9x 4.90') > 0
   && ua.indexOf('win') > 0);
  this.winnt = (ua.indexOf('nt') > 0
   && ua.indexOf('win') > 0);
  this.win2k = (ua.indexOf('nt 5') > 0
   && ua.indexOf('win') > 0);

  this.os2 = ua.indexOf('os/2') > 0;

  this.sun = ua.indexOf('sunos') > 0;
  this.irix = ua.indexOf('irix') > 0;
  this.hpux = ua.indexOf('hpux') > 0;
  this.aix = ua.indexOf('aix') > 0;
  this.dec = (ua.indexOf('dec') > 0
   || ua.indexOf('alpha') > 0 
   || ua.indexOf('osf1') > 0 
   || ua.indexOf('ultrix') > 0);
  this.sco = (ua.indexOf('sco') > 0
   || ua.indexOf('unix_sv') > 0);
  this.vms = (ua.indexOf('vax') > 0
   || ua.indexOf('openvms') > 0);
  this.linux = ua.indexOf('linux') > 0;
  this.sinix = ua.indexOf('sinix') > 0;
  this.reliant = ua.indexOf('reliantunix') > 0;
  this.freebsd = ua.indexOf('freebsd') > 0;
  this.openbsd = ua.indexOf('openbsd') > 0;
  this.netbsd = ua.indexOf('netbsd') > 0;
  this.bsd = ua.indexOf('bsd') > 0;
  this.unixware = ua.indexOf('unix_system_v') > 0;
  this.mpras = ua.indexOf('ncr') > 0;

  this.unix = ua.indexOf("x11") > 0;

  // workarounds
  // - IE5/Mac reports itself as version 4.0
  if(this.ie && this.mac) {
    if(ua.indexOf("msie 5")) {
      this.major = 5;
      var actual_index = ua.indexOf("msie 5");
      var actual_major = ua.substring(actual_index + 5, actual_index + 8);
      this.minor = parseFloat(actual_major);
    }
  }

  return this;
}