Module:I18n

--- I18n library for message storage in Lua datastores. -- The module is designed to enable message separation from modules & -- templates. It has support for handling language fallbacks. This -- module is a Lua port of I18n-js. -- --  @module         i18n -- @version        1.4.0 -- @require        Module:Entrypoint -- @require        Module:Fallbacklist -- @author         KockaAdmiralac -- @author         Speedit -- @attribution    Cqm -- @release        stable -- @todo           Add Lua i18n file support in the I18n-js editor. -- @see            I18n guide -- @see            I18n-js -- local i18n, _i18n = {}, {}

-- Module variables & dependencies. local title = mw.title.getCurrentTitle local fallbacks = require('Dev:Fallbacklist') local entrypoint = require('Dev:Entrypoint') local uselang

--- Argument substitution as $n where n > 0. -- @function           _i18n.handleArgs -- @param              {string} msg Message to substitute arguments into. -- @param              {table} args Arguments table to substitute. -- @return             {string} Resulting message. -- @local function _i18n.handleArgs(msg, args) for i, a in ipairs(args) do       msg = (string.gsub(msg, '%$' .. tostring(i), tostring(a))) end return msg end

--- Checks whether a language code is valid. -- @function           _i18n.isValidCode -- @param              {string} code Language code to check. -- @return             {boolean} Whether the language code is valid. -- @local function _i18n.isValidCode(code) return type(code) == 'string' and #mw.language.fetchLanguageName(code) ~= 0 end

--- Checks whether a message contains unprocessed wikitext. -- Used to optimise message getter by not preprocessing pure text. -- @function           _i18n.isWikitext -- @param              {string} msg Message to check. -- @return             {boolean} Whether the message contains wikitext. function _i18n.isWikitext(msg) return type(msg) == 'string' and (           msg:find('%-%-%-%-') or            msg:find('%f[^\n%z][;:*#] ') or            msg:find('%f[^\n%z]==* *[^\n|]+ =*=%f[\n]') or            msg:find('%b<>') or msg:find('\'\'') or            msg:find('%[%b[]%]') or msg:find('{%b{}}')        ) end

--- I18n datastore class. -- This is used to control language translation and access to individual -- messages. The datastore instance provides language and message -- getter-setter methods, which can be used to internationalize Lua modules. -- The language methods (any ending in `Lang`) are all **chainable**. -- @type            Data local Data = {} Data.__index = Data

--- Datastore message getter utility. -- This method returns localized messages from the datastore corresponding -- to a `key`. These messages may have `$n` parameters, which can be -- replaced by optional argument strings supplied by the `msg` call. -- --  This function supports named --  arguments. The named argument syntax is more versatile despite its -- verbosity; it can be used to select message language & source(s). -- @function           Data:msg -- @usage -- --      ds:msg{ --         key = 'message-name', --         lang = '', --         args = {...}, --         sources = {} --     } --  --  @usage -- --      ds:msg('message-name', ...) -- --  @param              {string|table} opts Message configuration or key. -- @param[opt]         {string} opts.key Message key to return from the --                     datastore. -- @param[opt]         {table} opts.args Arguments to substitute into the --                     message (`$n`). -- @param[opt]         {table} opts.sources Source names to limit to (see --                      `Data:fromSources`). -- @param[opt]         {table} opts.lang Temporary language to use (see --                      `Data:inLang`). -- @param[opt]         {string} ... Arguments to substitute into the message --                     (`$n`). -- @error[115]         {string} 'missing arguments in Data:msg' -- @return             {string} Localised datastore message or `' '`. function Data:msg(opts, ...) local frame = mw.getCurrentFrame -- Argument normalization. if not self or not opts then error('missing arguments in Data:msg') end local key = type(opts) == 'table' and opts.key or opts local args = opts.args or {...} -- Configuration parameters. if opts.sources then self:fromSources(unpack(opts.sources)) end if opts.lang then self:inLang(opts.lang) end -- Source handling. local source_n = self.tempSources or self._sources local source_i = {} for n, i in pairs(source_n) do       source_i[i] = n    end self.tempSources = nil -- Language handling. local lang = self.tempLang or self.defaultLang self.tempLang = nil -- Message fetching. local msg for i, messages in ipairs(self._messages) do       -- Message data. local msg = (messages[lang] or {})[key] -- Fallback support (experimental). for _, l in ipairs((fallbacks[lang] or {})) do           if msg == nil then msg = (messages[l] or {})[key] end end -- Internal fallback to 'en'. msg = msg ~= nil and msg or messages.en[key] -- Handling argument substitution from Lua. if msg and source_i[i] and #args > 0 then msg = _i18n.handleArgs(msg, args) end if msg and source_i[i] and lang ~= 'qqx' then return frame and _i18n.isWikitext(msg) and frame:preprocess(mw.text.trim(msg)) or mw.text.trim(msg) end end return mw.text.nowiki('<' .. key .. '>') end

-- Datastore template parameter getter utility. -- This method, given a table of arguments, tries to find a parameter's -- localized name in the datastore and returns its value, or nil if -- not present. -- -- This method always uses the wiki's content language. -- @function           Data:parameter -- @param              {string} parameter Parameter's key in the datastore -- @param              {table} args Arguments to find the parameter in -- @error[176]          {string} 'missing arguments in Data:parameter' -- @return             {string|nil} Parameter's value or nil if not present function Data:parameter(key, args) -- Argument normalization. if not self or not key or not args then error('missing arguments in Data:parameter') end local contentLang = mw.language.getContentLanguage:getCode -- Message fetching. for i, messages in ipairs(self._messages) do       local msg = (messages[contentLang] or {})[key] if msg ~= nil and args[msg] ~= nil then return args[msg] end for _, l in ipairs((fallbacks[contentLang] or {})) do           if msg == nil or args[msg] == nil then -- Check next fallback. msg = (messages[l] or {})[key] else -- A localized message was found. return args[msg] end end -- Fallback to English. msg = messages.en[key] if msg ~= nil and args[msg] ~= nil then return args[msg] end end end

--- Datastore temporary source setter to a specificed subset of datastores. -- By default, messages are fetched from the datastore in the same -- order of priority as `i18n.loadMessages`. -- @function           Data:fromSource -- @param              {string} ... Source name(s) to use. -- @return             {Data} Datastore instance. function Data:fromSource(...) local c = select('#', ...) if c ~= 0 then self.tempSources = {} for i = 1, c do           local n = select(i, ...) if type(n) == 'string' and type(self._sources[n]) == 'number' then self.tempSources[n] = self._sources[n] end end end return self end

--- Datastore default language getter. -- @function           Data:getLang -- @return             {string} Default language to serve datastore messages in. function Data:getLang return self.defaultLang end

--- Datastore language setter to `wgUserLanguage`. -- @function           Data:useUserLang -- @return             {Data} Datastore instance. -- @note               Scribunto only registers `wgUserLanguage` when an --                      invocation is at the top of the call stack. function Data:useUserLang self.defaultLang = i18n.getLang or self.defaultLang return self end

--- Datastore language setter to `wgContentLanguage`. -- @function           Data:useContentLang -- @return             {Data} Datastore instance. function Data:useContentLang self.defaultLang = mw.language.getContentLanguage:getCode return self end

--- Datastore language setter to specificed language. -- @function           Data:useLang -- @param              {string} code Language code to use. -- @return             {Data} Datastore instance. function Data:useLang(code) self.defaultLang = _i18n.isValidCode(code) and code or self.defaultLang return self end

--- Temporary datastore language setter to `wgUserLanguage`. -- The datastore language reverts to the default language in the next -- @{Data:msg} call. -- @function           Data:inUserLang -- @return             {Data} Datastore instance. function Data:inUserLang self.tempLang = i18n.getLang or self.tempLang return self end

--- Temporary datastore language setter to `wgContentLanguage`. -- Only affects the next @{Data:msg} call. -- @function           Data:inContentLang -- @return             {Data} Datastore instance. function Data:inContentLang self.tempLang = mw.language.getContentLanguage:getCode return self end

--- Temporary datastore language setter to a specificed language. -- Only affects the next @{Data:msg} call. -- @function           Data:inLang -- @param              {string} code Language code to use. -- @return             {Data} Datastore instance. function Data:inLang(code) self.tempLang = _i18n.isValidCode(code) and code or self.tempLang return self end

-- Package functions.

--- Localized message getter by key. -- Can be used to fetch messages in a specific language code through `uselang` -- parameter. Extra numbered parameters can be supplied for substitution into -- the datastore message. -- @function           i18n.getMsg -- @param              {table} frame Frame table from invocation. -- @param              {table} frame.args Metatable containing arguments. -- @param              {string} frame.args[1] ROOTPAGENAME of i18n submodule. -- @param              {string} frame.args[2] Key of i18n message. -- @param[opt]         {string} frame.args.lang Default language of message. -- @error[271]         'missing arguments in i18n.getMsg' -- @return             {string} I18n message in localised language. -- @usage function i18n.getMsg(frame) if       not frame or        not frame.args or        not frame.args[1] or        not frame.args[2] then error('missing arguments in i18n.getMsg') end local source = frame.args[1] local key = frame.args[2] -- Pass through extra arguments. local repl = {} for i, a in ipairs(frame.args) do       if i >= 3 then repl[i-2] = a       end end -- Load message data. local ds = i18n.loadMessages(source) -- Pass through language argument. ds:inLang(frame.args.uselang) -- Return message. return ds:msg { key = key, args = repl } end --- I18n message datastore loader. -- @function           i18n.loadMessages -- @param              {string} ... ROOTPAGENAME/path for target i18n --                     submodules. -- @error[322]         {string} 'no source supplied to i18n.loadMessages' -- @return             {table} I18n datastore instance. -- @usage              require('Dev:I18n').loadMessages('1', '2') function i18n.loadMessages(...) local ds   local i = 0 local s = {} for j = 1, select('#', ...) do       local source = select(j, ...) if type(source) == 'string' and source ~= '' then i = i + 1 s[source] = i           if not ds then -- Instantiate datastore. ds = {} ds._messages = {} -- Set default language. setmetatable(ds, Data) ds:useUserLang end source = string.gsub(source, '^.', mw.ustring.upper) source = mw.ustring.find(source, ':') and source or 'Dev:' .. source .. '/i18n' ds._messages[i] = mw.loadData(source) end end if not ds then error('no source supplied to i18n.loadMessages') else -- Attach source index map. ds._sources = s       -- Return datastore instance. return ds   end end

--- Language code getter. -- Can validate a template's language code through `uselang` parameter. -- @function           i18n.getLang -- @usage -- @return             {string} Language code. function i18n.getLang local frame = mw.getCurrentFrame or {} local parentFrame = frame.getParent and frame:getParent or {}

local code = mw.language.getContentLanguage:getCode local subPage = title.subpageText

-- Language argument test. local langOverride = (frame.args or {}).uselang or       (parentFrame.args or {}).uselang if _i18n.isValidCode(langOverride) then code = langOverride

-- Subpage language test. elseif title.isSubpage and _i18n.isValidCode(subPage) then code = _i18n.isValidCode(subPage) and subPage or code

-- User language test. elseif parentFrame.preprocess or frame.preprocess then uselang = uselang or parentFrame.preprocess and parentFrame:preprocess('') or frame:preprocess('') local decodedLang = mw.text.decode(uselang) if decodedLang ~= ' ' and decodedLang ~= '⧼lang⧽' then code = decodedLang == '(lang)' and 'qqx' or uselang end end

return code end

--- Template wrapper for Template:I18n. -- @function           i18n.main -- @param              {table} frame Frame invocation object. -- @return             {string} Module output in template context. -- @usage i18n.main = entrypoint(i18n)

return i18n --