resources/jquery/jquery.client.js

   1 /**
   2  * User-agent detection
   3  */
   4 ( function ( $ ) {
   5
   6         /* Private Members */
   7
   8         /**
   9          * @var profileCache {Object} Keyed by userAgent string,
  10          * value is the parsed $.client.profile object for that user agent.
  11          */
  12         var profileCache = {};
  13
  14         /* Public Methods */
  15
  16         $.client = {
  17
  18                 /**
  19                  * Get an object containing information about the client.
  20                  *
  21                  * @param nav {Object} An object with atleast a 'userAgent' and 'platform' key.
  22                  * Defaults to the global Navigator object.
  23                  * @return {Object} The resulting client object will be in the following format:
  24                  *  {
  25                  *   'name': 'firefox',
  26                  *   'layout': 'gecko',
  27                  *   'layoutVersion': 20101026,
  28                  *   'platform': 'linux'
  29                  *   'version': '3.5.1',
  30                  *   'versionBase': '3',
  31                  *   'versionNumber': 3.5,
  32                  *  }
  33                  */
  34                 profile: function ( nav ) {
  35                         /*jshint boss: true */
  36
  37                         if ( nav === undefined ) {
  38                                 nav = window.navigator;
  39                         }
  40                         // Use the cached version if possible
  41                         if ( profileCache[nav.userAgent] === undefined ) {
  42
  43                                 var
  44                                         versionNumber,
  45
  46                                         /* Configuration */
  47
  48                                         // Name of browsers or layout engines we don't recognize
  49                                         uk = 'unknown',
  50                                         // Generic version digit
  51                                         x = 'x',
  52                                         // Strings found in user agent strings that need to be conformed
  53                                         wildUserAgents = ['Opera', 'Navigator', 'Minefield', 'KHTML', 'Chrome', 'PLAYSTATION 3'],
  54                                         // Translations for conforming user agent strings
  55                                         userAgentTranslations = [
  56                                                 // Tons of browsers lie about being something they are not
  57                                                 [/(Firefox|MSIE|KHTML,\slike\sGecko|Konqueror)/, ''],
  58                                                 // Chrome lives in the shadow of Safari still
  59                                                 ['Chrome Safari', 'Chrome'],
  60                                                 // KHTML is the layout engine not the browser - LIES!
  61                                                 ['KHTML', 'Konqueror'],
  62                                                 // Firefox nightly builds
  63                                                 ['Minefield', 'Firefox'],
  64                                                 // This helps keep differnt versions consistent
  65                                                 ['Navigator', 'Netscape'],
  66                                                 // This prevents version extraction issues, otherwise translation would happen later
  67                                                 ['PLAYSTATION 3', 'PS3']
  68                                         ],
  69                                         // Strings which precede a version number in a user agent string - combined and used as match 1 in
  70                                         // version detectection
  71                                         versionPrefixes = [
  72                                                 'camino', 'chrome', 'firefox', 'netscape', 'netscape6', 'opera', 'version', 'konqueror',
  73                                                 'lynx', 'msie', 'safari', 'ps3'
  74                                         ],
  75                                         // Used as matches 2, 3 and 4 in version extraction - 3 is used as actual version number
  76                                         versionSuffix = '(\\/|\\;?\\s|)([a-z0-9\\.\\+]*?)(\\;|dev|rel|\\)|\\s|$)',
  77                                         // Names of known browsers
  78                                         names = [
  79                                                 'camino', 'chrome', 'firefox', 'netscape', 'konqueror', 'lynx', 'msie', 'opera',
  80                                                 'safari', 'ipod', 'iphone', 'blackberry', 'ps3', 'rekonq'
  81                                         ],
  82                                         // Tanslations for conforming browser names
  83                                         nameTranslations = [],
  84                                         // Names of known layout engines
  85                                         layouts = ['gecko', 'konqueror', 'msie', 'opera', 'webkit'],
  86                                         // Translations for conforming layout names
  87                                         layoutTranslations = [ ['konqueror', 'khtml'], ['msie', 'trident'], ['opera', 'presto'] ],
  88                                         // Names of supported layout engines for version number
  89                                         layoutVersions = ['applewebkit', 'gecko'],
  90                                         // Names of known operating systems
  91                                         platforms = ['win', 'mac', 'linux', 'sunos', 'solaris', 'iphone'],
  92                                         // Translations for conforming operating system names
  93                                         platformTranslations = [ ['sunos', 'solaris'] ],
  94
  95                                         /* Methods */
  96
  97                                         /**
  98                                          * Performs multiple replacements on a string
  99                                          */
 100                                         translate = function ( source, translations ) {
 101                                                 var i;
 102                                                 for ( i = 0; i < translations.length; i++ ) {
 103                                                         source = source.replace( translations[i][0], translations[i][1] );
 104                                                 }
 105                                                 return source;
 106                                         },
 107
 108                                         /* Pre-processing */
 109
 110                                         ua = nav.userAgent,
 111                                         match,
 112                                         name = uk,
 113                                         layout = uk,
 114                                         layoutversion = uk,
 115                                         platform = uk,
 116                                         version = x;
 117
 118                                 if ( match = new RegExp( '(' + wildUserAgents.join( '|' ) + ')' ).exec( ua ) ) {
 119                                         // Takes a userAgent string and translates given text into something we can more easily work with
 120                                         ua = translate( ua, userAgentTranslations );
 121                                 }
 122                                 // Everything will be in lowercase from now on
 123                                 ua = ua.toLowerCase();
 124
 125                                 /* Extraction */
 126
 127                                 if ( match = new RegExp( '(' + names.join( '|' ) + ')' ).exec( ua ) ) {
 128                                         name = translate( match[1], nameTranslations );
 129                                 }
 130                                 if ( match = new RegExp( '(' + layouts.join( '|' ) + ')' ).exec( ua ) ) {
 131                                         layout = translate( match[1], layoutTranslations );
 132                                 }
 133                                 if ( match = new RegExp( '(' + layoutVersions.join( '|' ) + ')\\\/(\\d+)').exec( ua ) ) {
 134                                         layoutversion = parseInt( match[2], 10 );
 135                                 }
 136                                 if ( match = new RegExp( '(' + platforms.join( '|' ) + ')' ).exec( nav.platform.toLowerCase() ) ) {
 137                                         platform = translate( match[1], platformTranslations );
 138                                 }
 139                                 if ( match = new RegExp( '(' + versionPrefixes.join( '|' ) + ')' + versionSuffix ).exec( ua ) ) {
 140                                         version = match[3];
 141                                 }
 142
 143                                 /* Edge Cases -- did I mention about how user agent string lie? */
 144
 145                                 // Decode Safari's crazy 400+ version numbers
 146                                 if ( name.match( /safari/ ) && version > 400 ) {
 147                                         version = '2.0';
 148                                 }
 149                                 // Expose Opera 10's lies about being Opera 9.8
 150                                 if ( name === 'opera' && version >= 9.8) {
 151                                         version = ua.match( /version\/([0-9\.]*)/i )[1] || 10;
 152                                 }
 153                                 versionNumber = parseFloat( version, 10 ) || 0.0;
 154
 155                                 /* Caching */
 156
 157                                 profileCache[nav.userAgent] = {
 158                                         name: name,
 159                                         layout: layout,
 160                                         layoutVersion: layoutversion,
 161                                         platform: platform,
 162                                         version: version,
 163                                         versionBase: ( version !== x ? Math.floor( versionNumber ).toString() : x ),
 164                                         versionNumber: versionNumber
 165                                 };
 166                         }
 167                         return profileCache[nav.userAgent];
 168                 },
 169
 170                 /**
 171                  * Checks the current browser against a support map object to determine if the browser has been black-listed or
 172                  * not. If the browser was not configured specifically it is assumed to work. It is assumed that the body
 173                  * element is classified as either "ltr" or "rtl". If neither is set, "ltr" is assumed.
 174                  *
 175                  * A browser map is in the following format:
 176                  * {
 177                  *   'ltr': {
 178                  *     // Multiple rules with configurable operators
 179                  *     'msie': [['>=', 7], ['!=', 9]],
 180                  *      // Blocked entirely
 181                  *     'iphone': false
 182                  *   },
 183                  *   'rtl': {
 184                  *     // Test against a string
 185                  *     'msie': [['!==', '8.1.2.3']],
 186                  *     // RTL rules do not fall through to LTR rules, you must explicity set each of them
 187                  *     'iphone': false
 188                  *   }
 189                  * }
 190                  *
 191                  * @param map {Object} Browser support map
 192                  * @param profile {Object} (optional) a client-profile object.
 193                  *
 194                  * @return Boolean true if browser known or assumed to be supported, false if blacklisted
 195                  */
 196                 test: function ( map, profile ) {
 197                         /*jshint evil: true */
 198
 199                         var conditions, dir, i, op, val;
 200                         profile = $.isPlainObject( profile ) ? profile : $.client.profile();
 201
 202                         dir = $( 'body' ).is( '.rtl' ) ? 'rtl' : 'ltr';
 203                         // Check over each browser condition to determine if we are running in a compatible client
 204                         if ( typeof map[dir] !== 'object' || map[dir][profile.name] === undefined ) {
 205                                 // Unknown, so we assume it's working
 206                                 return true;
 207                         }
 208                         conditions = map[dir][profile.name];
 209                         for ( i = 0; i < conditions.length; i++ ) {
 210                                 op = conditions[i][0];
 211                                 val = conditions[i][1];
 212                                 if ( val === false ) {
 213                                         return false;
 214                                 }
 215                                 if ( typeof val === 'string' ) {
 216                                         if ( !( eval( 'profile.version' + op + '"' + val + '"' ) ) ) {
 217                                                 return false;
 218                                         }
 219                                 } else if ( typeof val === 'number' ) {
 220                                         if ( !( eval( 'profile.versionNumber' + op + val ) ) ) {
 221                                                 return false;
 222                                         }
 223                                 }
 224                         }
 225                         return true;
 226                 }
 227         };
 228 }( jQuery ) );