resources/jquery/jquery.client.js

   1 /**
   2  * User-agent detection
   3  */
   4 $.client = new ( function() {
   5
   6         /* Private Members */
   7
   8         var profile;
   9
  10         /* Public Functions */
  11
  12         /**
  13          * Returns an object containing information about the browser
  14          *
  15          * The resulting client object will be in the following format:
  16          *      {
  17          *              'name': 'firefox',
  18          *              'layout': 'gecko',
  19          *              'layoutVersion': '20101026',
  20          *              'platform': 'linux'
  21          *              'version': '3.5.1',
  22          *              'versionBase': '3',
  23          *              'versionNumber': 3.5,
  24          *      }
  25          */
  26         this.profile = function() {
  27                 // Use the cached version if possible
  28                 if ( typeof profile === 'undefined' ) {
  29
  30                         /* Configuration */
  31
  32                         // Name of browsers or layout engines we don't recognize
  33                         var uk = 'unknown';
  34                         // Generic version digit
  35                         var x = 'x';
  36                         // Strings found in user agent strings that need to be conformed
  37                         var wildUserAgents = [ 'Opera', 'Navigator', 'Minefield', 'KHTML', 'Chrome', 'PLAYSTATION 3'];
  38                         // Translations for conforming user agent strings
  39                         var userAgentTranslations = [
  40                             // Tons of browsers lie about being something they are not
  41                                 [/(Firefox|MSIE|KHTML,\slike\sGecko|Konqueror)/, ''],
  42                                 // Chrome lives in the shadow of Safari still
  43                                 ['Chrome Safari', 'Chrome'],
  44                                 // KHTML is the layout engine not the browser - LIES!
  45                                 ['KHTML', 'Konqueror'],
  46                                 // Firefox nightly builds
  47                                 ['Minefield', 'Firefox'],
  48                                 // This helps keep differnt versions consistent
  49                                 ['Navigator', 'Netscape'],
  50                                 // This prevents version extraction issues, otherwise translation would happen later
  51                                 ['PLAYSTATION 3', 'PS3'],
  52                         ];
  53                         // Strings which precede a version number in a user agent string - combined and used as match 1 in
  54                         // version detectection
  55                         var versionPrefixes = [
  56                                 'camino', 'chrome', 'firefox', 'netscape', 'netscape6', 'opera', 'version', 'konqueror', 'lynx',
  57                                 'msie', 'safari', 'ps3'
  58                         ];
  59                         // Used as matches 2, 3 and 4 in version extraction - 3 is used as actual version number
  60                         var versionSuffix = '(\\/|\\;?\\s|)([a-z0-9\\.\\+]*?)(\\;|dev|rel|\\)|\\s|$)';
  61                         // Names of known browsers
  62                         var names = [
  63                                 'camino', 'chrome', 'firefox', 'netscape', 'konqueror', 'lynx', 'msie', 'opera', 'safari', 'ipod',
  64                                 'iphone', 'blackberry', 'ps3'
  65                         ];
  66                         // Tanslations for conforming browser names
  67                         var nameTranslations = [];
  68                         // Names of known layout engines
  69                         var layouts = ['gecko', 'konqueror', 'msie', 'opera', 'webkit'];
  70                         // Translations for conforming layout names
  71                         var layoutTranslations = [['konqueror', 'khtml'], ['msie', 'trident'], ['opera', 'presto']];
  72                         // Names of supported layout engines for version number
  73                         var layoutVersions = ['applewebkit', 'gecko'];
  74                         // Names of known operating systems
  75                         var platforms = ['win', 'mac', 'linux', 'sunos', 'solaris', 'iphone'];
  76                         // Translations for conforming operating system names
  77                         var platformTranslations = [['sunos', 'solaris']];
  78
  79                         /* Methods */
  80
  81                         // Performs multiple replacements on a string
  82                         function translate( source, translations ) {
  83                                 for ( var i = 0; i < translations.length; i++ ) {
  84                                         source = source.replace( translations[i][0], translations[i][1] );
  85                                 }
  86                                 return source;
  87                         };
  88
  89                         /* Pre-processing  */
  90
  91                         var userAgent = navigator.userAgent, match, name = uk, layout = uk, layoutversion = uk, platform = uk, version = x;
  92                         if ( match = new RegExp( '(' + wildUserAgents.join( '|' ) + ')' ).exec( userAgent ) ) {
  93                                 // Takes a userAgent string and translates given text into something we can more easily work with
  94                                 userAgent = translate( userAgent, userAgentTranslations );
  95                         }
  96                         // Everything will be in lowercase from now on
  97                         userAgent = userAgent.toLowerCase();
  98
  99                         /* Extraction */
 100
 101                         if ( match = new RegExp( '(' + names.join( '|' ) + ')' ).exec( userAgent ) ) {
 102                                 name = translate( match[1], nameTranslations );
 103                         }
 104                         if ( match = new RegExp( '(' + layouts.join( '|' ) + ')' ).exec( userAgent ) ) {
 105                                 layout = translate( match[1], layoutTranslations );
 106                         }
 107                         if ( match = new RegExp( '(' + layoutVersions.join( '|' ) + ')\\\/(\\d+)').exec( navigator.userAgent.toLowerCase() ) ) {
 108                                 layoutversion = parseInt(match[2]);
 109                         }
 110                         if ( match = new RegExp( '(' + platforms.join( '|' ) + ')' ).exec( navigator.platform.toLowerCase() ) ) {
 111                                 platform = translate( match[1], platformTranslations );
 112                         }
 113                         if ( match = new RegExp( '(' + versionPrefixes.join( '|' ) + ')' + versionSuffix ).exec( userAgent ) ) {
 114                                 version = match[3];
 115                         }
 116
 117                         /* Edge Cases -- did I mention about how user agent string lie? */
 118
 119                         // Decode Safari's crazy 400+ version numbers
 120                         if ( name.match( /safari/ ) && version > 400 ) {
 121                                 version = '2.0';
 122                         }
 123                         // Expose Opera 10's lies about being Opera 9.8
 124                         if ( name === 'opera' && version >= 9.8) {
 125                                 version = userAgent.match( /version\/([0-9\.]*)/i )[1] || 10;
 126                         }
 127
 128                         /* Caching */
 129
 130                         profile = {
 131                                 'name': name,
 132                                 'layout': layout,
 133                                 'layoutVersion': layoutversion,
 134                                 'platform': platform,
 135                                 'version': version,
 136                                 'versionBase': ( version !== x ? new String( version ).substr( 0, 1 ) : x ),
 137                                 'versionNumber': ( parseFloat( version, 10 ) || 0.0 )
 138                         };
 139                 }
 140                 return profile;
 141         };
 142
 143         /**
 144          * Checks the current browser against a support map object to determine if the browser has been black-listed or
 145          * not. If the browser was not configured specifically it is assumed to work. It is assumed that the body
 146          * element is classified as either "ltr" or "rtl". If neither is set, "ltr" is assumed.
 147          *
 148          * A browser map is in the following format:
 149          *      {
 150          *              'ltr': {
 151          *                      // Multiple rules with configurable operators
 152          *                      'msie': [['>=', 7], ['!=', 9]],
 153          *                      // Blocked entirely
 154          *                      'iphone': false
 155          *              },
 156          *              'rtl': {
 157          *                      // Test against a string
 158          *                      'msie': [['!==', '8.1.2.3']],
 159          *                      // RTL rules do not fall through to LTR rules, you must explicity set each of them
 160          *                      'iphone': false
 161          *              }
 162          *      }
 163          *
 164          * @param map Object of browser support map
 165          *
 166          * @return Boolean true if browser known or assumed to be supported, false if blacklisted
 167          */
 168         this.test = function( map ) {
 169                 var profile = $.client.profile();
 170                 var dir = $( 'body' ).is( '.rtl' ) ? 'rtl' : 'ltr';
 171                 // Check over each browser condition to determine if we are running in a compatible client
 172                 if ( typeof map[dir] !== 'object' || map[dir][profile.name] !== 'object' ) {
 173                         // Unknown, so we assume it's working
 174                         return true;
 175                 }
 176                 var name = map[dir][profile.name];
 177                 for ( var condition in name ) {
 178                         var op = name[condition][0];
 179                         var val = name[condition][1];
 180                         if ( val === false ) {
 181                                 return false;
 182                         } else if ( typeof val == 'string' ) {
 183                                 if ( !( eval( 'profile.version' + op + '"' + val + '"' ) ) ) {
 184                                         return false;
 185                                 }
 186                         } else if ( typeof val == 'number' ) {
 187                                 if ( !( eval( 'profile.versionNumber' + op + val ) ) ) {
 188                                         return false;
 189                                 }
 190                         }
 191                 }
 192                 return true;
 193         }
 194 } )();