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+/*!
+ * ULS Event logger
+ *
+ * See https://meta.wikimedia.org/wiki/Schema:UniversalLanguageSelector
+ *
+ * @private
+ * @since 2013.08
+ *
+ * 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';
+
+	/**
+	 * Try to emit an EventLogging event with schema 'UniversalLanguageSelector'.
+	 *
+	 * If EventLogging is not installed, this simply does nothing.
+	 *
+	 * @param {Object} event Event action and optional fields
+	 */
+	function log( event ) {
+		event = $.extend( {
+			version: 1,
+			token: mw.user.id(),
+			contentLanguage: mw.config.get( 'wgContentLanguage' ),
+			interfaceLanguage: mw.config.get( 'wgUserLanguage' )
+		}, event );
+
+		mw.track( 'event.UniversalLanguageSelector', event );
+	}
+
+	/**
+	 * Log language settings open
+	 *
+	 * @param {string} context Where it was opened from
+	 */
+	function ulsSettingsOpen( context ) {
+		log( {
+			action: 'settings-open',
+			context: context
+		} );
+	}
+
+	/**
+	 * Log language revert
+	 *
+	 * @param {jQuery.Deferred} deferred
+	 */
+	function ulsLanguageRevert( deferred ) {
+		log( { action: 'ui-lang-revert' } ).always( deferred.resolve() );
+	}
+
+	/**
+	 * Log IME disabling
+	 *
+	 * @param {string} context Where the setting was changed.
+	 */
+	function disableIME( context ) {
+		log( { action: 'ime-disable', context: context } );
+	}
+
+	/**
+	 * Log IME enabling
+	 *
+	 * @param {string} context Where the setting was changed.
+	 */
+	function enableIME( context ) {
+		log( { action: 'ime-enable', context: context } );
+	}
+
+	/**
+	 * Log IME change
+	 *
+	 * @param {string} inputMethod
+	 */
+	function changeIME( inputMethod ) {
+		log( {
+			action: 'ime-change',
+			inputMethod: inputMethod
+		} );
+	}
+
+	/**
+	 * Log login link click in display settings.
+	 *
+	 * @param {jQuery.Deferred} deferred
+	 */
+	function loginClick( deferred ) {
+		log( { action: 'login-click' } );
+		deferred.resolve();
+	}
+
+	/**
+	 * Log when "More languages" item in IME menu is clicked.
+	 */
+	function imeMoreLanguages() {
+		log( {
+			action: 'more-languages-access',
+			context: 'ime'
+		} );
+	}
+
+	/**
+	 * Log interface language change
+	 *
+	 * @param {string} language language code
+	 * @param {jQuery.Deferred} deferred
+	 */
+	function interfaceLanguageChange( language, deferred ) {
+		var logParams = {
+			action: 'language-change',
+			context: 'interface',
+			interfaceLanguage: language
+		};
+
+		log( logParams );
+		deferred.resolve();
+	}
+
+	/**
+	 * More languages in display settings is clicked
+	 */
+	function interfaceMoreLanguages() {
+		log( {
+			action: 'more-languages-access',
+			context: 'interface'
+		} );
+	}
+
+	/**
+	 * Log font preference changes
+	 *
+	 * @param {string} context Either 'interface' or 'content'
+	 * @param {string} language
+	 * @param {string} font
+	 */
+	function fontChange( context, language, font ) {
+		var logParams = {
+			action: 'font-change',
+			context: context
+		};
+
+		if ( context === 'interface' ) {
+			logParams.interfaceFont = font;
+			// Override in case the user changed the ui language but hasn't applied it yet
+			logParams.interfaceLanguage = language;
+		} else {
+			logParams.contentFont = font;
+		}
+
+		log( logParams );
+	}
+
+	/**
+	 * Log webfonts disabling
+	 *
+	 * @param {string} context Where the setting was changed.
+	 */
+	function disableWebfonts( context ) {
+		log( { action: 'webfonts-disable', context: context } );
+	}
+
+	/**
+	 * Log webfonts enabling
+	 *
+	 * @param {string} context Where the setting was changed.
+	 */
+	function enableWebfonts( context ) {
+		log( { action: 'webfonts-enable', context: context } );
+	}
+
+	/**
+	 * Log search strings which produce no search results.
+	 *
+	 * @param {jQuery.event} event The original event
+	 * @param {Object} data Information about the failed search
+	 */
+	function noSearchResults( event, data ) {
+		log( {
+			action: 'no-search-results',
+			context: data.query,
+			ulsPurpose: data.ulsPurpose,
+			title: mw.config.get( 'wgPageName' )
+		} );
+	}
+
+	/**
+	 * Start listening for event logging
+	 */
+	function listen() {
+		// Register handlers for event logging triggers
+		mw.hook( 'mw.uls.settings.open' ).add( ulsSettingsOpen );
+		mw.hook( 'mw.uls.language.revert' ).add( ulsLanguageRevert );
+		mw.hook( 'mw.uls.ime.enable' ).add( enableIME );
+		mw.hook( 'mw.uls.ime.disable' ).add( disableIME );
+		mw.hook( 'mw.uls.ime.change' ).add( changeIME );
+		mw.hook( 'mw.uls.login.click' ).add( loginClick );
+		mw.hook( 'mw.uls.ime.morelanguages' ).add( imeMoreLanguages );
+		mw.hook( 'mw.uls.interface.morelanguages' ).add( interfaceMoreLanguages );
+		mw.hook( 'mw.uls.interface.language.change' ).add( interfaceLanguageChange );
+		mw.hook( 'mw.uls.font.change' ).add( fontChange );
+		mw.hook( 'mw.uls.webfonts.enable' ).add( enableWebfonts );
+		mw.hook( 'mw.uls.webfonts.disable' ).add( disableWebfonts );
+
+		$( 'body' ).on(
+			'noresults.uls',
+			'.uls-menu .uls-languagefilter',
+			noSearchResults
+		);
+	}
+
+	listen();
+}() );