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Modul:I18n

Ḍâri Wikipèḍia bhâsa Madhurâ, lombhung pangataowan mardhika
I18n
DescriptionLibrary for message storage in Lua datastores.
Author(s)
Code sourceI18n
StatusRelease
Dependencies
Using code byCqm

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 wikia:dev:I18n-js and i18n modules that can be loaded by it are editable through wikia:dev:I18nEdit.

Documentation

Package items

i18n.getMsg(frame) (function)
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.
Parameters:
frame Frame table from invocation. (table)
frame.args Metatable containing arguments. (table)
frame.args[1] ROOTPAGENAME of i18n submodule. (string)
frame.args[2] Key of i18n message. (string)
frame.args.lang Default language of message. (string; optional)
Error: 'missing arguments in i18n.getMsg' (line 271)
Returns: I18n message in localised language. (string)
Usage: {{i18n}}
i18n.loadMessages(...) (function)
I18n message datastore loader.
Parameter: ... ROOTPAGENAME/path for target i18n submodules. (string)
Error: 'no source supplied to i18n.loadMessages' (string; line 322)
Returns: I18n datastore instance. (table)
Usage: require('Module:I18n').loadMessages('1', '2')
i18n.getLang() (function)
Language code getter. Can validate a template's language code through uselang parameter.
Returns: Language code. (string)
Usage: {{i18n}}
i18n.main(frame) (function)
Template wrapper for Template:I18n.
Parameter: frame Frame invocation object. (table)
Returns: Module output in template context. (string)
Usage: {{i18n}}
_i18n.isWikitext(msg) (function)
Checks whether a message contains unprocessed wikitext. Used to optimise message getter by not preprocessing pure text.
Parameter: msg Message to check. (string)
Returns: Whether the message contains wikitext. (boolean)

Data

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.

Data:msg(opts, ...) (function)
Datastore message getter utility. This method returns localized messages from the datastore corresponding to a key. These messages may have $n parameters, which can be replaced by optional argument strings supplied by the msg call.
This function supports named arguments. The named argument syntax is more versatile despite its verbosity; it can be used to select message language & source(s).
Parameters:
opts Message configuration or key. (string|table)
opts.key Message key to return from the datastore. (string; optional)
opts.args Arguments to substitute into the message ($n). (table; optional)
opts.sources Source names to limit to (see Data:fromSources). (table; optional)
opts.lang Temporary language to use (see Data:inLang). (table; optional)
... Arguments to substitute into the message ($n). (string; optional)
Error: 'missing arguments in Data:msg' (string; line 115)
Returns: Localised datastore message or '<key>'. (string)
Usage:
ds:msg{
    key = 'message-name',
    lang = '',
    args = {...},
    sources = {}
}
ds:msg('message-name', ...)
Data:parameter(parameter, args) (function)
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.
Parameters:
parameter Parameter's key in the datastore (string)
args Arguments to find the parameter in (table)
Error: 'missing arguments in Data:parameter' (string; line 176)
Returns: Parameter's value or nil if not present (string|nil)
Data:fromSource(...) (function)
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.
Parameter: ... Source name(s) to use. (string)
Returns: Datastore instance. (Data)
Data:getLang() (function)
Datastore default language getter.
Returns: Default language to serve datastore messages in. (string)
Data:useUserLang() (function)
Datastore language setter to wgUserLanguage.
Returns: Datastore instance. (Data)
Note: Scribunto only registers wgUserLanguage when an invocation is at the top of the call stack.
Data:useContentLang() (function)
Datastore language setter to wgContentLanguage.
Returns: Datastore instance. (Data)
Data:useLang(code) (function)
Datastore language setter to specificed language.
Parameter: code Language code to use. (string)
Returns: Datastore instance. (Data)
Data:inUserLang() (function)
Temporary datastore language setter to wgUserLanguage. The datastore language reverts to the default language in the next Data:msg call.
Returns: Datastore instance. (Data)
Data:inContentLang() (function)
Temporary datastore language setter to wgContentLanguage. Only affects the next Data:msg call.
Returns: Datastore instance. (Data)
Data:inLang(code) (function)
Temporary datastore language setter to a specificed language. Only affects the next Data:msg call.
Parameter: code Language code to use. (string)
Returns: Datastore instance. (Data)

See also


--- 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 [[wikia:dev:I18n-js]] and i18n modules that can be loaded
--  by it are editable through [[wikia:dev:I18nEdit]].
--  
--  @module         i18n
--  @version        1.4.0
--  @require        Module:Entrypoint
--  @require        Module:Fallbacklist
--  @author         [[wikia:User:KockaAdmiralac|KockaAdmiralac]]
--  @author         [[wikia:User:Speedit|Speedit]]
--  @attribution    [[wikia:User:Cqm|Cqm]]
--  @release        stable
--  @see            [[wikia:dev:I18n|I18n guide]]
--  @see            [[wikia:dev:I18n-js]]
--  @see            [[wikia:dev:I18nEdit]]
--  <nowiki>
local i18n, _i18n = {}, {}

--  Module variables & dependencies.
local title = mw.title.getCurrentTitle()
local fallbacks = require('Module:Fallbacklist')
local entrypoint = require('Module: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 `$n` parameters, which can be
--  replaced by optional argument strings supplied by the `msg` call.
--  
--  This function supports [[Lua reference manual#named_arguments|named
--  arguments]]. The named argument syntax is more versatile despite its
--  verbosity; it can be used to select message language & source(s).
--  @function           Data:msg
--  @usage
--  
--      ds:msg{
--          key = 'message-name',
--          lang = '',
--          args = {...},
--          sources = {}
--      }
--  
--  @usage
--  
--      ds:msg('message-name', ...)
--  
--  @param              {string|table} opts Message configuration or key.
--  @param[opt]         {string} opts.key Message key to return from the
--                      datastore.
--  @param[opt]         {table} opts.args Arguments to substitute into the
--                      message (`$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 `'<key>'`.
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              {{i18n|getMsg|source|key|arg1|arg2|uselang {{=}} code}}
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('Module: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  'Module:' .. 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              {{i18n|getLang|uselang {{=}} code}}
--  @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('{{int:lang}}')
                or  frame:preprocess('{{int:lang}}')
        local decodedLang = mw.text.decode(uselang) 
        if decodedLang ~= '<lang>' 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              {{#invoke:i18n|main}}
i18n.main = entrypoint(i18n)

return i18n
-- </nowiki>