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/**
* This file is where we decide whether to initialise the Grade A run-time.
*
* - Beware: This file MUST parse without errors on even the most ancient of browsers!
* - Beware: Do not call mwNow before the isCompatible() check.
*/
/* global mw, mwPerformance, mwNow, isCompatible, $VARS, $CODE */
window.mwPerformance = ( window.performance && performance.mark ) ? performance : {
mark: function () {}
};
// Define now() here to ensure valid comparison with mediaWikiLoadEnd (T153819).
window.mwNow = ( function () {
var perf = window.performance,
navStart = perf && perf.timing && perf.timing.navigationStart;
return navStart && typeof perf.now === 'function' ?
function () { return navStart + perf.now(); } :
function () { return Date.now(); };
}() );
/**
* See <https://www.mediawiki.org/wiki/Compatibility#Browsers>
*
* Capabilities required for modern run-time:
* - ECMAScript 5
* - DOM Level 4 & Selectors API Level 1
* - HTML5 & Web Storage
* - DOM Level 2 Events
*
* Browsers we support in our modern run-time (Grade A):
* - Chrome 13+
* - IE 11+
* - Firefox 4+
* - Safari 5+
* - Opera 15+
* - Mobile Safari 6.0+ (iOS 6+)
* - Android 4.1+
*
* Browsers we support in our no-javascript run-time (Grade C):
* - Chrome 1+
* - IE 6+
* - Firefox 3+
* - Safari 3+
* - Opera 15+
* - Mobile Safari 5.0+ (iOS 4+)
* - Android 2.0+
* - WebOS < 1.5
* - PlayStation
* - Symbian-based browsers
* - NetFront-based browser
* - Opera Mini
* - Nokia's Ovi Browser
* - MeeGo's browser
* - Google Glass
* - UC Mini (speed mode on)
*
* Other browsers that pass the check are considered Grade X.
*
* @param {string} [str] User agent, defaults to navigator.userAgent
* @return {boolean} User agent is compatible with MediaWiki JS
*/
window.isCompatible = function ( str ) {
var ua = str || navigator.userAgent;
return !!(
// https://caniuse.com/#feat=es5
// https://caniuse.com/#feat=use-strict
// https://caniuse.com/#feat=json / https://phabricator.wikimedia.org/T141344#2784065
( function () {
'use strict';
return !this && !!Function.prototype.bind && !!window.JSON;
}() ) &&
// https://caniuse.com/#feat=queryselector
'querySelector' in document &&
// https://caniuse.com/#feat=namevalue-storage
// https://developer.blackberry.com/html5/apis/v1_0/localstorage.html
// https://blog.whatwg.org/this-week-in-html-5-episode-30
'localStorage' in window &&
// https://caniuse.com/#feat=addeventlistener
'addEventListener' in window &&
// Hardcoded exceptions for browsers that pass the requirement but we don't want to
// support in the modern run-time.
// Note: Please extend the regex instead of adding new ones
!(
ua.match( /MSIE 10|webOS\/1\.[0-4]|SymbianOS|Series60|NetFront|Opera Mini|S40OviBrowser|MeeGo|Android.+Glass|^Mozilla\/5\.0 .+ Gecko\/$|googleweblight/ ) ||
ua.match( /PlayStation/i )
)
);
};
// Conditional script injection
( function () {
var NORLQ, script;
if ( !isCompatible() ) {
// Undo class swapping in case of an unsupported browser.
// See ResourceLoaderClientHtml::getDocumentAttributes().
document.documentElement.className = document.documentElement.className
.replace( /(^|\s)client-js(\s|$)/, '$1client-nojs$2' );
NORLQ = window.NORLQ || [];
while ( NORLQ.length ) {
NORLQ.shift()();
}
window.NORLQ = {
push: function ( fn ) {
fn();
}
};
// Clear and disable the other queue
window.RLQ = {
// No-op
push: function () {}
};
return;
}
/**
* The $CODE and $VARS placeholders are substituted in ResourceLoaderStartUpModule.php.
*/
function startUp() {
mw.config = new mw.Map( $VARS.wgLegacyJavaScriptGlobals );
$CODE.registrations();
mw.config.set( $VARS.configuration );
// Must be after mw.config.set because these callbacks may use mw.loader which
// needs to have values 'skin', 'debug' etc. from mw.config.
// eslint-disable-next-line vars-on-top
var RLQ = window.RLQ || [];
while ( RLQ.length ) {
RLQ.shift()();
}
window.RLQ = {
push: function ( fn ) {
fn();
}
};
// Clear and disable the other queue
window.NORLQ = {
// No-op
push: function () {}
};
}
window.mediaWikiLoadStart = mwNow();
mwPerformance.mark( 'mwLoadStart' );
script = document.createElement( 'script' );
script.src = $VARS.baseModulesUri;
script.onload = function () {
// Clean up
script.onload = null;
script = null;
// Callback
startUp();
};
document.head.appendChild( script );
}() );
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