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( 'mediaWikiStartUp' );
  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 /**
  72  * The $CODE and $VARS placeholders are substituted in ResourceLoaderStartUpModule.php.
  73  */
  74 function startUp() {
  75         mw.config = new mw.Map( $VARS.wgLegacyJavaScriptGlobals );
  76
  77         $CODE.registrations();
  78
  79         mw.config.set( $VARS.configuration );
  80
  81         // Must be after mw.config.set because these callbacks may use mw.loader which
  82         // needs to have values 'skin', 'debug' etc. from mw.config.
  83         window.RLQ = window.RLQ || [];
  84         while ( RLQ.length ) {
  85                 RLQ.shift()();
  86         }
  87         window.RLQ = {
  88                 push: function ( fn ) {
  89                         fn();
  90                 }
  91         };
  92 }
  93
  94 // Conditional script injection
  95 if ( isCompatible() ) {
  96         ( function () {
  97                 var script = document.createElement( 'script' );
  98                 script.src = $VARS.baseModulesUri;
  99                 document.getElementsByTagName( 'head' )[0].appendChild( script );
 100         }() );
 101 } else {
 102         // Undo class swapping in case of an unsupported browser.
 103         // See OutputPage::getHeadScripts().
 104         document.documentElement.className = document.documentElement.className
 105                 .replace( /(^|\s)client-js(\s|$)/, '$1client-nojs$2' );
 106 }