resources/src/startup.js

   1 /**
   2  * This script provides a function which is run to evaluate whether or not to
   3  * continue loading jQuery and the MediaWiki modules. This code should work on
   4  * even the most ancient of browsers, so be very careful when editing.
   5  */
   6
   7 var mediaWikiLoadStart = ( new Date() ).getTime();
   8
   9 if ( !window.performance ) {
  10         window.performance = {};
  11 }
  12 if ( !performance.mark ) {
  13         performance.mark = function () {};
  14 }
  15 performance.mark( 'mwLoadStart' );
  16
  17 /**
  18  * Returns false for Grade C supported browsers.
  19  *
  20  * This function should only be used by the Startup module, do not expand it to
  21  * be generally useful beyond startup.
  22  *
  23  * See also:
  24  * - https://www.mediawiki.org/wiki/Compatibility#Browsers
  25  * - https://jquery.com/browser-support/
  26  */
  27
  28 /*jshint unused: false, evil: true */
  29 /*globals mw, RLQ: true, $VARS, $CODE */
  30 function isCompatible( ua ) {
  31         if ( ua === undefined ) {
  32                 ua = navigator.userAgent;
  33         }
  34
  35         // Browsers with outdated or limited JavaScript engines get the no-JS experience
  36         return !(
  37                 // Internet Explorer < 8
  38                 ( ua.indexOf( 'MSIE' ) !== -1 && parseFloat( ua.split( 'MSIE' )[ 1 ] ) < 8 ) ||
  39                 // Firefox < 3
  40                 ( ua.indexOf( 'Firefox/' ) !== -1 && parseFloat( ua.split( 'Firefox/' )[ 1 ] ) < 3 ) ||
  41                 // Opera < 12
  42                 ( ua.indexOf( 'Opera/' ) !== -1 && ( ua.indexOf( 'Version/' ) === -1 ?
  43                         // "Opera/x.y"
  44                         parseFloat( ua.split( 'Opera/' )[ 1 ] ) < 10 :
  45                         // "Opera/9.80 ... Version/x.y"
  46                         parseFloat( ua.split( 'Version/' )[ 1 ] ) < 12
  47                 ) ) ||
  48                 // "Mozilla/0.0 ... Opera x.y"
  49                 ( ua.indexOf( 'Opera ' ) !== -1 && parseFloat( ua.split( ' Opera ' )[ 1 ] ) < 10 ) ||
  50                 // BlackBerry < 6
  51                 ua.match( /BlackBerry[^\/]*\/[1-5]\./ ) ||
  52                 // Open WebOS < 1.5
  53                 ua.match( /webOS\/1\.[0-4]/ ) ||
  54                 // Anything PlayStation based.
  55                 ua.match( /PlayStation/i ) ||
  56                 // Any Symbian based browsers
  57                 ua.match( /SymbianOS|Series60/ ) ||
  58                 // Any NetFront based browser
  59                 ua.match( /NetFront/ ) ||
  60                 // Opera Mini, all versions
  61                 ua.match( /Opera Mini/ ) ||
  62                 // Nokia's Ovi Browser
  63                 ua.match( /S40OviBrowser/ ) ||
  64                 // MeeGo's browser
  65                 ua.match( /MeeGo/ ) ||
  66                 // Google Glass browser groks JS but UI is too limited
  67                 ( ua.match( /Glass/ ) && ua.match( /Android/ ) )
  68         );
  69 }
  70
  71 // Conditional script injection
  72 ( function () {
  73         if ( !isCompatible() ) {
  74                 // Undo class swapping in case of an unsupported browser.
  75                 // See OutputPage::getHeadScripts().
  76                 document.documentElement.className = document.documentElement.className
  77                         .replace( /(^|\s)client-js(\s|$)/, '$1client-nojs$2' );
  78                 return;
  79         }
  80
  81         /**
  82          * The $CODE and $VARS placeholders are substituted in ResourceLoaderStartUpModule.php.
  83          */
  84         function startUp() {
  85                 mw.config = new mw.Map( $VARS.wgLegacyJavaScriptGlobals );
  86
  87                 $CODE.registrations();
  88
  89                 mw.config.set( $VARS.configuration );
  90
  91                 // Must be after mw.config.set because these callbacks may use mw.loader which
  92                 // needs to have values 'skin', 'debug' etc. from mw.config.
  93                 window.RLQ = window.RLQ || [];
  94                 while ( RLQ.length ) {
  95                         RLQ.shift()();
  96                 }
  97                 window.RLQ = {
  98                         push: function ( fn ) {
  99                                 fn();
 100                         }
 101                 };
 102         }
 103
 104         var script = document.createElement( 'script' );
 105         script.src = $VARS.baseModulesUri;
 106         script.onload = script.onreadystatechange = function () {
 107                 if ( !script.readyState || /loaded|complete/.test( script.readyState ) ) {
 108                         // Clean up
 109                         script.onload = script.onreadystatechange = null;
 110                         script = null;
 111                         // Callback
 112                         startUp();
 113                 }
 114         };
 115         document.getElementsByTagName( 'head' )[ 0 ].appendChild( script );
 116 }() );