Extension:UniversalLanguageSelector

The Universal Language Selector is a tool that allows users to select a language and configure its support in an easy way. Where used, it also ships the functionality of both WebFonts and Narayam extensions. See Universal Language Selector for background and additional information.

Usage
The primary aim is to allow users to select a language and configure its support in an easy way.

The extension provides the following features:


 * 1) Flexible and easy way to select a language from a large set of languages.
 * 2) Selection can be based on geographical region based browsing, searching.
 * 3) Search can be based on ISO language code, language name written in current user interface language or in its own script(autonym)
 * 4) Cross language search - search language names using any script
 * 5) Autocompletion of language names
 * 6) Auto correction of spelling mistakes in search strings
 * 7) Geo IP based language suggestions
 * 8) Language selection based on users browser/OS language
 * 9) Input methods
 * 10) An easily selectable input method collection, readily available in every editable field
 * 11) Provides a large set of input methods for wide range of languages
 * 12) * An outdated list is available at Extension:Narayam
 * 13) Per-language input method preferences
 * 14) Webfonts
 * 15) A large collection of fonts to choose for each language to use as embedded font for the page
 * 16) * An outdated list is available at Extension:WebFonts
 * 17) Per-language font preferences



Adding support for a new languages fonts
Follow the instructions on the WebFonts page, but file requests in the UniversalLanguageSelector bugzilla component.

Adding support for a new key mapping (input method)
Follow the instructions on the Narayam page, but file requests in the UniversalLanguageSelector bugzilla component.

Updating LanguageNameIndex
For performing cross language search, searching autonyms, language data needs to be populated. ULS comes with a pre-populated language name index(data/langnames.ser). In case you want to update it, install Extension:CLDR and update the data with the following command. php ULS/data/LanguageNameIndexer.php

and verify that langnames.ser file gets generated in ULS/data/ folder.

Configuration
The following variables are created automatically during initialization and can be used from JavaScript using mw.config.get( NAME ):
 * - an associative array where the keys are language codes and the values are language names in English.
 * - an array of language codes from the user's Accept-Language value. These are the languages selected in the user's browser preferences.

ULS uses jquery.i18n to load translation in JSON format with XHR. If your is on different server this means it will attempt CORS (which means it is only supported on modern browsers). You need to configure Access-Control-Allow-Origin on your assets domain for this to work.

For serving fonts, you might want to add the following mime types to your webserver if not already there. This guide might help.


 * application/x-font-woff .woff
 * application/vnd.ms-fontobject .eot
 * application/x-font-ttf .ttf

The following variables can also be configured:
 * - ULS can use geolocation services to suggest languages based on the country the user is vising from. Setting this to false will prevent builtin geolocation from being used. You can provide your own geolocation by setting window.Geo to object which has key 'country_code' or 'country'. If set to true, it will query Wikimedia's geoip service. The service should return jsonp that uses the supplied callback parameter. Defaults to http://freegeoip.net/json/ and expects the same format.
 * - Enable language selection, input methods and webfonts for everyone, unless the behavior is overridden by the configuration variables below. Even if false the classes and resource loader modules are registered for the use of other extensions. Language changing via cookie or setlang query parameter is not possible.
 * - Allow anonymous users to change language with cookie and setlang query param. Do not use if you are caching anonymous page views without taking cookies into account.Does not have any effect if either of   or $wgULSEnableAnon is set to false.
 * - Disable the input methods feature for all users by default. Can still be enabled manually by the user.
 * - The location and the form of the language selection trigger. The possible values are: : as a link near the username or the log in link in the personal toolbar (default).  : as an icon near the header of the list of interlanguage links in the sidebar.
 * - Array of jQuery selectors of elements on which IME must not be enabled. eg:

Overriding default fonts
ULS has a large font repository to serve as webfonts. Sometimes there are multiple fonts for a language and there is a default font for each language/script. The order of fonts or default font can be overridden as follows using global scripts(MediaWiki:Common.js) or personal scripts(User:Example/common.js)

Here, languageCode should be a valid langauge code(eg: en, hi, nl). FontA and FontB are fonts available in font repository. In the above example for languageCode, we set a font available in local computer as default font. ie No default webfont.

Caching configuration
To ensure that the web fonts files are cached on the clients' machines, font file types must be added to the web server configuration. In Apache2 this consists of:
 * Adding font file extensions to the FileTimes regex at FilesMatch for the relevant directory, example:
 * Adding ExpiresByType values to the relevant MIME types, similarly to image MIME types.
 * Note that there's no standard MIME type for TTF. application/x-font-ttf is used for Wikimedia.
 * Adding the MIME types:
 * AddType application/x-woff .woff
 * AddType application/vnd.ms-fontobject .eot
 * AddType application/x-font-ttf .ttf

For a full example see the caching configuration update done for the Wikimedia cluster.

Using Webfonts
User can choose webfonts for a language from the Language settings -> Display settings. By default, the first font in that menu will be applied to the wiki. A user can change the font and it will be remembered across the pages. Optionally user can disable the font embedding too by selecting system font.

If the font is available in user's local system, font will not be downloaded from the mediawiki server. It will be taken from the user's computer. Otherwise, font will be downloaded from the server only once. ie when the user selects the font first time. Next time onwards, font will be taken from the local cache.

By specifying font-family
Inside the wiki text YourText, webfonts extension will check whether the font is available with the extension, if so it will download it to the client. So the reader will not face any difficulty in reading the text even if the font specified is not available in their computer.

By specifying language
Inside the wiki text YourText, webfonts extension will check whether any font is available for the given language with the extension, if so it will download it to the client. So the reader will not face any difficulty in reading the text even if the font specified is not available in their computer. If there are multiple fonts for the language, the default font will be used. If default font is not preferred, use the font-family approach to specify the font. If the tag has both lang and font-family definitions, font-family get precedence.