Module:Languages

--[=[ Not globally exposed. Internal function only.

language_subpages( frame, transform, options ) Parameters frame:    The frame that was passed to the method invoked. The first argument or the page argument will be respected. transform: A transform function. Example: function( basepagename, subpagename, code, langname ) end options:  An object with options. Example: { abort= { on=function end, time=0.8 } } Following options are available: abort: Aborts iterating over the subpages if one of the conditions is met. If the process is aborted, nil is returned! on: Function to be called if an abort-condition was met. cycles: The maximum number of subpages to run over. time: Maximum time to spend running over the subpages.

]=] function language_subpages( frame, transform, options ) local args, pargs, options = frame.args, ( frame:getParent or {} ).args or {}, options or {}; local title = args.page or args[1] or pargs.page or pargs[1] or ""; local abort = options.abort or {}; local at, clock = type( abort.on ), os.clock; local ac = function if at == 'function' or ( at == 'table' and getmetatable(abort.on).__call ) then abort.on; end end local tt = type( transform ); local page = require( 'Module:Page' );

title = page.clean(title);

if tt == 'function' or ( tt == 'table' and getmetatable(transform).__call ) then local fetch, pages, langcode, langname = mw.language.fetchLanguageName, {}; --[==[

/ \   / | \   /  ·  \   ¯¯¯¯¯¯¯   Page.subpages no longer works because it attempted to parse the HTML content generated by   calling the parser function "Special:Prefixindex:" which is no longer expanded in Lua but converted to a "stripped tag" (containing a unique identifier surrounded by ASCII DEL characters) representing the tag name and its parameters. The actual expansion of stripped tags can no longer be performed in Lua. Now unstripping these tags just kills ALL these tags (except "wiki" tags) instead of performing their expansion by running the extension code. Only MediaWiki can unstrip these tags in texts after they have been returned by Lua. For this reason, page.subpages is now completely empty (Module:Page no longer works). This cannot be bypassed, except by using a Scribunto extension library if lifting the limits set by mw.unstrip. Note that "Special:Prefixindex:" is also costly, even if it just requires a single database query to  get all subpages, instead of one costly #ifexist or one costly mw.title property reading per tested subpage to know if it exists. For now there's still no reliable way to get a list of subpages, or performing queries similar to  the Special:Prefixindex page or list members of a category like when viewing a category page. Ideally, there should exist a method for such queries on Title objects returned by the mw.title library; but for now there's none. In Lua now, the only expansion possible with an immediate effect is the expansion of standard templates, all special tags or special pages, or parser function extensions do not work (Only the #expr parser  function is supported by using an external Scribunto library). --]==]       for pg in page.subpages( title, { ignoreNS=true } ) do            if abort.cycles then abort.cycles = abort.cycles - 1 if 0 == abort.cycles then return ac end end if abort.time then if (os.clock - clock) > abort.time then return ac end end if mw.ustring.len( pg ) <= 12 then langcode = string.lower( pg ); langname = fetch( langcode ); if langname ~= '' then table.insert( pages, transform( title, pg, langcode, langname ) ); end end end return pages; end return {}; end

function cloneArgs(frame) local args, pargs = {}, {} for k,v in pairs( frame.args ) do args[k] = v end if frame:getParent then for k,v in pairs( frame:getParent.args ) do pargs[k] = v end end return args, pargs end

local p = {};

--[=[ Usage:

]=] function p.internal(frame) return table.concat(       language_subpages( frame, function( title, page, code, name ) return mw.ustring.format(                   '%s ',                    code, code,                    title, page,                    name                ); end ),       ' ·&#32;'    ); end

--[=[ Usage:

]=] function p.external(frame) return table.concat(       language_subpages( frame, function( title, page, code, name ) return mw.ustring.format(                   '[%s/%s %s] ',                    code, code,                    tostring( mw.uri.fullUrl( title ) ), page:gsub( ' ', '_' ),                    name                ); end ),       ' ·&#32;'    ); end

--[=[ forEachLanguage

This function iterates over all language codes known to MediaWiki based on a maintained list replacing patterns in a pattern-string for each language

Usage

Parameters pattern: A pattern string which is processed for each language and which is concatenated at the end and returned as one string before: A string that is inserted before the concatenated result after: A string that is inserted after the concatenated result sep: A string that is inserted between each line created from the pattern while iterating (like ProcessedPattern_sep_ProcessedPattern_sep_ProcessedPattern) inLang: Langcode to use for $lnTrP and $lnTrUC1 preprocess: if set to a non-empty value, the output will be preprocessed before being returned.

Warning The output is still not prepreprocessed by default: so parser functions and magic keywords generated by the pattern are still not executed and replaced, and template transclusions are still not expanded (see examples in other functions in this module). When using this function directly from a MediaWiki page or template, this means it is only possible to use patterns generating basic MediaWiki formatting or HTML tags. It you want the output to be preprocessed (in the given frame), set the preprocess parameter to a non-empty string. Patterns $lc - language code such as en or de   $lnP - language name in own language (autonym) $lnUC1 - language name in own language (autonym), first letter upper case $lnTrP - language name translated to the language requested by language code passed to inLang $lnTrUC1 - language name translated to the language requested by language code passed to inLang, first letter upper case

Example ]=]

-- =p.forEachLanguage({ args= { pattern = "$lc - $lnTrP\n", inLang = "en" } }) function p.forEachLanguage(frame) local l = require("Module:Languages/List")

local ret = {} local lang   = mw.language local line local pattern = frame.args.pattern  or frame.args[1] or "" local prefix = frame.args.before    or frame.args[2] or "" local postfix = frame.args.after    or frame.args[3] or "" local sep    = frame.args.sep       or frame.args.separator or frame.args[4] or "" local inLang = frame.args.inLang    or frame.args[5] or nil local preprocess = frame.args.preprocess or frame.args[6] or ""

local langNameUCFirstReq          = not not pattern:find( "$lnUC1", 1, true ) local langNameReq                 = not not pattern:find( "$lnP", 1, true ) or langNameUCFirstReq local langNameTranslatedUCFirstReq = not not pattern:find( "$lnTrUC1", 1, true ) local langNameTranslatedReq       = not not pattern:find( "$lnTrP", 1, true ) or langNameTranslatedUCFirstReq local contentLangInstance = mw.language.getContentLanguage local inLangLangInstance local l = mw.language.fetchLanguageNames -- autonyms local lTr local lcIdList = require('Module:Languages/List').getSortedList( l )

if langNameTranslatedReq then inLangLangInstance = --[==[ mw.getLanguage( inLang ) -- Quota hit in :ucfirst if using too many langInstances --]==] contentLangInstance lTr = mw.language.fetchLanguageNames( inLang ) -- translated names end

for _, lcId in pairs( lcIdList ) do       local subst = lcId:gsub('%%', '%%%%') line = pattern:gsub( "%$lc", subst ) local langName, langInstance -- autonym (name of lcId in locale lcId) if langNameReq then langName = l[lcId] subst = langName:gsub('%%', '%%%%') line = line:gsub( "%$lnP", subst ) end if langNameUCFirstReq then langInstance = --[==[ mw.getLanguage( lcId ) -- Quota hit in :ucfirst if using too many langInstances --]==] contentLangInstance langName = langInstance:ucfirst( langName ) subst = langName:gsub('%%', '%%%%') line = line:gsub( "%$lnUC1", subst ) end

-- translated name (name of lcId in locale inLang) if langNameTranslatedReq then langName = lTr[lcId] subst = langName:gsub('%%', '%%%%') line = line:gsub( "%$lnTrP", subst ) end if langNameTranslatedUCFirstReq then langName = inLangLangInstance:ucfirst( langName ) subst = langName:gsub('%%', '%%%%') line = line:gsub( "%$lnTrUC1", subst ) end

table.insert(ret, line) end ret = prefix .. table.concat( ret, sep ) .. postfix if preprocess ~= '' then ret = frame:preprocess(ret) end return ret end

--[=[ Provide logic for Template:Lle (Language Links external, to be substituted, language names written exactly as #language would provide them) Warning: may expands too many costly #ifexist without limitation (if not substituted into a separate "/lang" template) ]=] function p.lle(frame) return frame:preprocess(       p.forEachLanguage({ args = { pattern = '[ $lnP ] ∙&#32;' }       })    ) end

--[=[ Provide logic for Template:Ll (Language Links internal, to be substituted, language names written exactly as #language would provide them) Warning: may expands too many costly #ifexist without limitation (if not substituted into a separate "/lang" template) ]=] function p.ll(frame) return frame:preprocess(       p.forEachLanguage({ args = { pattern = '$lnP ∙&#32;' }       })    ) end

--- Different approaches for Template:Lang links ---

--[=[ Provide logic for Template:Lang links Using a cute Hybrid-Method: First check the subpages which is quite fast; if there are too many fall back to checking for each language page individually ]=]

-- =p.langLinksNonExpensive({ args= { page='Commons:Picture of the Year/2010' }, getParent=function end }) -- =p.langLinksNonExpensive({ args= { page='Main Page' }, getParent=function end }) -- =p.langLinksNonExpensive({ args= { page='Template:No_source_since' }, getParent=function end }) -- =p.langLinksNonExpensive({ args= { page='MediaWiki:Gadget-HotCat' }, getParent=function end }) function p.langLinksNonExpensive(frame) local args, pargs = frame.args, ( frame:getParent or {} ).args or {}; local title = args.page or args[1] or pargs.page or pargs[1] or ""; local contentLangInstance = mw.language.getContentLanguage; local pages2 if frame.preprocess == nil then frame = mw.getCurrentFrame end --[==[   local options = { abort = { time = 3.5, on = function pages2 = p.forEachLanguage({                   args = {                       pattern = ''                    }                }) end }   }    local pages = language_subpages( frame,        function( title, page, code, langname )            return mw.ustring.format( '%s ∙&#32;', title, page, code, langname )       end, options ); return pages2 and frame:preprocess(pages2) or table.concat(pages, ''); --]==]   return frame:preprocess(        p.forEachLanguage( { args = { pattern = '' }       })    ) end

- - Template:Autolang - - -- Works like  just allowing an unlimited number of arguments, even named arguments.  It's doing Magic! No arguments should be passed to

function p.autolang(frame) local args, pargs = cloneArgs( frame ) if nil == args.useargs then if not args.base then args = pargs end elseif 'both' == args.useargs then for k,v in pairs(args) do pargs[k] = v end args = pargs elseif 'parent' == args.useargs then args = pargs if pargs.base and not args.base then args.base = pargs.base end end local base = args.base local userlang = frame:preprocess( '' ) local tl, tlns = 'Template:', 10 local tlb, fallback1, currenttemplate local fallback, contentlang = mw.text.split( userlang, '-', true )[1], mw.language.getContentLanguage:getCode

local createReturn = function(title) local ret local tlargs = {} -- When LUA is invoked, templates are already expanded. This must be respected. return frame:expandTemplate{ title = title, args = args } end

if not base then return ("'autolang' in Module:Languages was called but the 'base' parameter could not be found." ..           "The base parameter specifies the template that's subpages will be sought for a suitable translation.") end tlb = tl .. base .. '/'

currenttemplate = tlb .. userlang local ok, exists = pcall( function       return mw.title.new( currenttemplate, tlns ).exists    end ) if ok and exists then return createReturn(currenttemplate) end

fallback1 = frame:preprocess( '' ) if fallback1 ~= contentlang then return createReturn(tlb .. fallback1) end

currenttemplate = tlb .. fallback local ok, exists = pcall( function       return mw.title.new( currenttemplate, tlns ).exists    end ) if ok and exists then return createReturn(currenttemplate) end

currenttemplate = tlb .. contentlang local ok, exists = pcall( function       return mw.title.new( currenttemplate, tlns ).exists    end ) if ok and exists then return createReturn(currenttemplate) end return createReturn(tl .. base) end

--[=[ Usage: -> 1 -> ]=] function p.isKnownLanguageTag(frame) return mw.language.isKnownLanguageTag( frame.args[1] or frame.args.tag or frame.args.code or  ) and '1' or  end

function p.file_languages(frame) local M_link = require( 'Module:Link' ) local contentLangInstance = mw.language.getContentLanguage local pattern = frame.args.pattern or '%s (%s)' local original = frame.args.original or mw.title.getCurrentTitle.text local ext_start, _ = string.find( original, '\.%w+$' ) local file_ext = string.sub( original, ext_start ) original = string.sub( original, 0, ext_start - 1 ) return frame:preprocess(       ''    ) end

function p.runTests return p.langLinksNonExpensive({       args = {            page = 'Module:Languages/testcases/test'        },        getParent = function end    }) == ' Deutsch ∙&#32;' .. ' English ∙&#32;' end

return p;