ext.uls.common.js
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ext.uls.common.js
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	/*!
	* ULS startup script - MediaWiki specific customization for jquery.uls
	*
	* Copyright (C) 2012-2013 Alolita Sharma, Amir Aharoni, Arun Ganesh, Brandon Harris,
	* Niklas Laxström, Pau Giner, Santhosh Thottingal, Siebrand Mazeland and other
	* contributors. See CREDITS for a list.
	*
	* UniversalLanguageSelector is dual licensed GPLv2 or later and MIT. You don't
	* have to do anything special to choose one license or the other and you don't
	* have to notify anyone which license you are using. You are free to use
	* UniversalLanguageSelector in commercial projects as long as the copyright
	* header is left intact. See files GPL-LICENSE and MIT-LICENSE for details.
	*
	* @file
	* @ingroup Extensions
	* @licence GNU General Public Licence 2.0 or later
	* @licence MIT License
	*/

	( function () {
	'use strict';

	/*
	* The 'als' is used in a non-standard way in MediaWiki -
	* it may be used to represent the Allemanic language,
	* the standard code of which is 'gsw', while 'als'
	* is ISO 639 3 refers to Tosk Albanian, which is
	* not currently used in any way in MediaWiki.
	* This local fix adds a redirect for it.
	*/
	$.uls.data.addLanguage( 'als', { target: 'gsw' } );

	mw.uls = mw.uls \|\| {};
	mw.uls.previousLanguagesStorageKey = 'uls-previous-languages';

	/**
	* Change the language of wiki using API or set cookie and reload the page
	*
	* @param {string} language Language code.
	*/
	mw.uls.changeLanguage = function ( language ) {
	mw.uls.setLanguage( language ).then( function () {
	location.reload();
	} );
	};

	/**
	* Change the language of wiki using API or set cookie.
	*
	* @param {string} language Language code.
	* @return {jQuery.Promise}
	*/
	mw.uls.setLanguage = function ( language ) {
	var api = new mw.Api();

	function changeLanguageAnon() {
	if ( mw.config.get( 'wgULSAnonCanChangeLanguage' ) ) {
	mw.cookie.set( 'language', language );
	}
	return $.Deferred().resolve();
	}

	// Track if event logging is enabled
	mw.hook( 'mw.uls.interface.language.change' ).fire( language );

	if ( !mw.user.isNamed() ) {
	return changeLanguageAnon();
	}

	// TODO We can avoid doing this query if we know global preferences are not enabled
	return api.get( {
	action: 'query',
	meta: 'globalpreferences',
	gprprop: 'preferences'
	} ).then( function ( res ) {
	// Check whether global preferences are in use. If they are not, `res.query` is
	// an empty object. `res` will also contain warnings about unknown parameters.
	try {
	return !!res.query.globalpreferences.preferences.language;
	} catch ( e ) {
	return false;
	}
	} ).then( function ( hasGlobalPreference ) {
	var apiModule;

	if ( hasGlobalPreference ) {
	apiModule = 'globalpreferenceoverrides';
	mw.storage.set( 'uls-gp', '1' );
	} else {
	apiModule = 'options';
	mw.storage.remove( 'uls-gp' );
	}

	return api.postWithToken( 'csrf', {
	action: apiModule,
	optionname: 'language',
	optionvalue: language
	} );
	} ).catch( function () {
	// Setting the option failed. Maybe the user has logged off.
	// Continue like anonymous user and set cookie.
	return changeLanguageAnon();
	} );
	};

	mw.uls.setPreviousLanguages = function ( previousLanguages ) {
	try {
	localStorage.setItem(
	mw.uls.previousLanguagesStorageKey,
	JSON.stringify( previousLanguages.slice( 0, 9 ) )
	);
	} catch ( e ) {}
	};

	/**
	* Normalize a language code for ULS usage.
	*
	* MediaWiki language codes (especially on WMF sites) are inconsistent
	* with ULS codes. We need to use ULS codes to access the proper data.
	*
	* @param {string} code
	* @return {string} Normalized language code
	*/
	mw.uls.convertMediaWikiLanguageCodeToULS = function ( code ) {
	code = code.toLowerCase();
	return $.uls.data.isRedirect( code ) \|\| code;
	};

	/**
	* @param {Element[]} nodes to parse
	* @return {Object} that maps language codes to the corresponding DOM elements
	*/
	mw.uls.getInterlanguageListFromNodes = function ( nodes ) {
	var interlanguageList = {};

	Array.prototype.forEach.call( nodes, function ( el ) {
	var langCode = mw.uls.convertMediaWikiLanguageCodeToULS( el.lang );
	interlanguageList[ langCode ] = el;
	} );

	return interlanguageList;
	};

	mw.uls.getPreviousLanguages = function () {
	var previousLanguages = [];

	try {
	previousLanguages.push.apply(
	previousLanguages,
	JSON.parse( localStorage.getItem( mw.uls.previousLanguagesStorageKey ) )
	);
	} catch ( e ) {}

	return previousLanguages.slice( 0, 9 );
	};

	/**
	* Add a selected language to the list of previously selected languages.
	*
	* @param {string} language Language code.
	* @since 2016.05
	*/
	mw.uls.addPreviousLanguage = function ( language ) {
	var languages = mw.uls.getPreviousLanguages(),
	index = languages.indexOf( language );

	// Avoid duplicates
	if ( index !== -1 ) {
	languages.splice( index, 1 );
	}
	languages.unshift( language );

	mw.uls.setPreviousLanguages( languages );
	};

	/**
	* Returns the browser's user interface language or the system language.
	* The caller should check the validity of the returned language code.
	*
	* @return {string} Language code or empty string.
	*/
	mw.uls.getBrowserLanguage = function () {
	// language is the standard property.
	// userLanguage is only for IE and returns system locale.
	// Empty string is a fallback in case both are undefined
	// to avoid runtime error with split().
	return ( window.navigator.language \|\| window.navigator.userLanguage \|\| '' ).split( '-' )[ 0 ];
	};

	mw.uls.getCountryCode = function () {
	return window.Geo && ( window.Geo.country \|\| window.Geo.country_code );
	};

	mw.uls.getAcceptLanguageList = function () {

	return mw.config.get( 'wgULSAcceptLanguageList' ) \|\| window.navigator.languages \|\| [];
	};

	/**
	* Get a list of codes for languages to show in
	* the "Common languages" section of the ULS.
	* The list consists of the user's current selected language,
	* the wiki's content language, the browser' UI language
	* and Accept-Language, user's previous selected languages
	* and finally, the languages of countryCode taken from the CLDR,
	* taken by default from the user's geolocation.
	*
	* @param {string} [countryCode] Uppercase country code.
	* @return {Array} List of language codes without duplicates.
	*/
	mw.uls.getFrequentLanguageList = function ( countryCode ) {
	var i, j, lang,
	ret = [],
	lists = [
	[
	mw.config.get( 'wgUserLanguage' ),
	mw.config.get( 'wgContentLanguage' ),
	mw.uls.getBrowserLanguage()
	],
	mw.uls.getPreviousLanguages(),
	mw.uls.getAcceptLanguageList()
	];

	countryCode = countryCode \|\| mw.uls.getCountryCode();
	if ( countryCode ) {
	lists.push( $.uls.data.getLanguagesInTerritory( countryCode ) );
	}

	for ( i = 0; i < lists.length; i++ ) {
	for ( j = 0; j < lists[ i ].length; j++ ) {
	lang = lists[ i ][ j ];
	// Make flat, make unique, and ignore unknown/unsupported languages
	if ( ret.indexOf( lang ) === -1 && $.uls.data.getAutonym( lang ) !== lang ) {
	ret.push( lang );
	}
	}
	}

	return ret;
	};
	}() );

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