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ext.uls.compactlinks.js
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ext.uls.compactlinks.js
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/*!
* Compact the interlanguage links in the sidebar
*
* Copyright (C) 2012-2014 Alolita Sharma, Amir Aharoni, Arun Ganesh, Brandon Harris,
* Niklas Laxström, Pau Giner, Santhosh Thottingal, Siebrand Mazeland, Niharika Kohli
* 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 GPL-2.0-or-later
* @licence MIT License
*/
( function () {
'use strict';
var DEFAULT_LIST_SIZE = 9;
/**
* @param {Array} target
* @param {Array} source
* @param {string|string[]|undefined} items Language code, or list of language codes
*/
function addMatchWithoutDuplicate( target, source, items ) {
var i;
if ( items === undefined ) {
return;
}
items = !Array.isArray( items ) ? [ items ] : items;
for ( i = 0; i < items.length; i++ ) {
if (
// Only add if unique and matches source
target.indexOf( items[ i ] ) === -1 &&
source.indexOf( items[ i ] ) !== -1
) {
target.push( items[ i ] );
}
}
}
/**
* Get user-defined assistant languages on wikis with Translate extension.
*
* Where available, they're languages deemed useful by the user.
*
* @return {string[]|undefined} Language codes
*/
function getAssistantLanguages() {
var assistantLanguages = mw.user.options.get( 'translate-editlangs' );
if ( !assistantLanguages || assistantLanguages === 'default' ) {
return;
}
return assistantLanguages.split( /,\s*/ );
}
/**
* Get previously selected languages.
*
* Previous languages are a good suggestion because the user has
* explicitly chosen them in the past.
*
* @return {string[]} Language codes
*/
function getPreviousLanguages() {
return mw.uls.getPreviousLanguages();
}
/**
* Get languages from the Babel box on the user's user page.
*
* @return {string[]|undefined} Language codes
*/
function getBabelLanguages() {
return mw.config.get( 'wgULSBabelLanguages' );
}
/**
* Get site-specific highlighted languages. Mostly used on Wikimedia sites.
*
* @return {string[]|undefined} Language codes
*/
function getSitePicks() {
return mw.config.get( 'wgULSCompactLinksPrepend' );
}
/**
* Get probable languages predicted by ULS.
*
* @return {string[]} Language codes
*/
function getCommonLanguages() {
return mw.uls.getFrequentLanguageList();
}
/**
* Get globally common languages.
*
* These are not user-specific. This helps to avoid biasing the compact list
* to language codes that sort to the beginning of the alphabet in the
* final stage.
*
* @return {string[]} Language codes
*/
function getExtraCommonLanguages() {
return [
'zh', 'en', 'hi', 'ur', 'es', 'ar', 'ru', 'id', 'ms', 'pt',
'fr', 'de', 'bn', 'ja', 'pnb', 'pa', 'jv', 'te', 'ta', 'ko', 'mr', 'tr', 'vi',
'it', 'fa', 'sv', 'nl', 'pl'
];
}
/**
* The final strategy is the original interlanguage list.
*
* @param {string[]} languages Language codes
* @return {string[]} Language codes
*/
function getFinalFallback( languages ) {
return languages;
}
/**
* @class
* @constructor
* @param {HTMLElement} listElement Interlanguage list element
* @param {Object} [options]
* @param {number} [options.max] maximum number of languages to show
* in the compacted list. This defaults to DEFAULT_LIST_SIZE.
*/
function CompactInterlanguageList( listElement, options ) {
this.listElement = listElement;
this.options = options || {};
/**
* @private
* @property {Object} interlanguageList
*/
this.interlanguageList = mw.uls.getInterlanguageListFromNodes(
listElement.querySelectorAll( '.interlanguage-link-target' )
);
/**
* @private
* @property {Object} interlanguageList
*/
this.compactList = null;
this.$trigger = null;
this.compactSize = 0;
this.listSize = 0;
}
/**
* Initialize the plugin
*/
CompactInterlanguageList.prototype.init = function () {
var max = this.options.max || DEFAULT_LIST_SIZE;
this.listSize = Object.keys( this.interlanguageList ).length;
if ( this.listSize <= max ) {
// Not enough languages to compact the list
mw.hook( 'mw.uls.compactlinks.initialized' ).fire( false );
return;
}
// If we're only a bit beyond max, limit to 7 instead of 9.
// FIXME: This assumes the max is 9.
this.compactSize = ( this.listSize <= 12 ) ? 7 : max;
this.compactList = this.getCompactList();
this.hideOriginal();
this.render();
};
/**
* Render the compacted interlanguage list and triggers
*/
CompactInterlanguageList.prototype.render = function () {
var language;
for ( language in this.compactList ) {
this.compactList[ language ].parentNode.style.display = '';
}
// If there is an interlanguage selector in the page already
// there is no need to add a trigger and Codex styles (T353850).
mw.loader.using( '@wikimedia/codex' ).then( function () {
this.addTrigger();
}.bind( this ) );
mw.hook( 'mw.uls.compactlinks.initialized' ).fire( true );
};
/**
* Get the compacted interlanguage list as associative array
*
* @return {Object}
*/
CompactInterlanguageList.prototype.getCompactList = function () {
var language, languages, compactLanguages, i, compactedList;
compactedList = {};
languages = Object.keys( this.interlanguageList );
compactLanguages = this.compact( languages );
for ( i = 0; i < compactLanguages.length; i++ ) {
language = compactLanguages[ i ];
compactedList[ language ] = this.interlanguageList[ language ];
}
return compactedList;
};
/**
* Get compacting strategies.
*
* The items will be executed in the given order till the required
* compact size is achieved. Each strategy is given two arrays: `candidates`
* and `languages`. The candidates array is a list the callback should add to.
* The languages list contains language codes actually available for the current
* page, the callback may use this to optimise their search for candidates,
* although compact() will filter out irrelevant candidates so strategies should
* only use this if it helps narrow their search for candidates, avoid needless
* filtering that compact() will do already.
*
* @return {Function[]} Array of compacting functions
*/
CompactInterlanguageList.prototype.getCompactStrategies = function () {
return [
getAssistantLanguages,
getPreviousLanguages,
getBabelLanguages,
getSitePicks,
getCommonLanguages,
this.getLangsInText.bind( this ),
this.getLangsWithBadges.bind( this ),
getExtraCommonLanguages,
getFinalFallback
];
};
/**
* Compact a given array of languages
*
* @param {Array} languages
* @return {Array} Compacted array
*/
CompactInterlanguageList.prototype.compact = function ( languages ) {
var i, strategies, found,
compactLanguages = [];
strategies = this.getCompactStrategies();
for ( i = 0; i < strategies.length; i++ ) {
found = strategies[ i ]( languages );
// Add language codes from 'found' that are also in 'languages'
// to 'compactLanguages' (if not already in there).
addMatchWithoutDuplicate( compactLanguages, languages, found );
if ( compactLanguages.length >= this.compactSize ) {
// We have more than enough items. Stop here.
compactLanguages = compactLanguages.slice( 0, this.compactSize );
break;
}
}
return compactLanguages;
};
/**
* Get language codes that are used in the page's text content.
*
* This is done by looking for HTML elements with a "lang" attribute—they
* are likely to appear in a foreign name, for example.
*
* The reader doesn't necessarily know this language, but it
* appears relevant to the page.
*
* @return {string[]} Language codes
*/
CompactInterlanguageList.prototype.getLangsInText = function () {
var languagesInText = [];
Array.prototype.forEach.call( document.querySelectorAll( '#mw-content-text [lang]' ), function ( el ) {
var lang = mw.uls.convertMediaWikiLanguageCodeToULS( el.lang );
if ( languagesInText.indexOf( lang ) === -1 ) {
languagesInText.push( lang );
}
} );
return languagesInText;
};
/**
* Get languages in which a related page has any kind of a badge,
* such as "featured article". The "badge-*" classes are added by Wikibase.
*
* @return {string[]} Language codes
*/
CompactInterlanguageList.prototype.getLangsWithBadges = function () {
return Array.prototype.map.call(
this.listElement.querySelectorAll( '[class*="badge"] a.interlanguage-link-target' ),
function ( el ) {
return mw.uls.convertMediaWikiLanguageCodeToULS( el.lang );
}
);
};
/**
* Hide languages in the interlanguage list.
*
* The most relevant ones are unhidden in #render.
*/
CompactInterlanguageList.prototype.hideOriginal = function () {
var links = this.listElement.querySelectorAll( '.interlanguage-link' ),
i = links.length;
while ( i-- ) {
links[ i ].style.display = 'none';
}
};
/**
* Add the trigger at the bottom of the language list.
*
* Click handler is setup in ext.uls.interface module.
*/
CompactInterlanguageList.prototype.addTrigger = function () {
var trigger = document.createElement( 'button' );
// TODO: Should we have a different class name where the CLS styles are attached?
trigger.className = 'mw-interlanguage-selector cdx-button';
trigger.title = mw.message( 'ext-uls-compact-link-info' ).plain();
// Use text() because the message needs {{PLURAL:}}
trigger.textContent = mw.message(
'ext-uls-compact-link-count',
mw.language.convertNumber( this.listSize - this.compactSize )
).text();
this.listElement.appendChild( trigger );
this.$trigger = $( trigger );
};
/**
* Performance cost of calling createCompactList(), as of 2021-02-10.
*
* Summary:
* - DOM Queries: 5
* * createCompactList (1 querySelector)
* * CompactInterlanguageList constructor (1 querySelectorAll)
* * getLangsWithBadges (1 querySelectorAll)
* * getLangsInText (1 querySelectorAll)
* * hideOriginal (1 querySelectorAll)
* - DOM Writes: 1 + 2N
* * addTrigger (1 appendChild)
* * hideOriginal (1N Element.style)
* * render (1N Element.style) // N defaults to 9
* - Misc: 1
* * addTrigger (1 mw.Message#parser)
*/
function createCompactList() {
var listElement, compactList;
listElement = document.querySelector( '.mw-portlet-lang ul, #p-lang ul' );
if ( !listElement ) {
// Not all namespaces will have a list of languages.
return;
}
compactList = new CompactInterlanguageList( listElement );
compactList.init();
}
// Early execute of createCompactList
if ( document.readyState === 'interactive' ) {
createCompactList();
} else {
$( createCompactList );
}
}() );

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