Templat:Mw lang

require('Module:No globals'); local getArgs = require('Module:Arguments').getArgs

--[[--------------------------< E R R _ M S G _ M A K E >------------------------------------------------------ ]]

local function err_msg_make (msg) return '' end

--[[--------------------------< _ I S _ C O D E >--------------------------------------------------------------

local or require()d entry point

return true if is a mediawiki recognized code; false else

- language code to validate; expected to be lowercase without leading/trailing whitespace <target_lang_code> - language code for target language; expected to be valid; expected to be lowercase without leading/trailing whitespace

specifying <target_lang_code> may be a pointless exercise because of cldr fallback. For example, mw.language.fetchLanguageName (crh, sq) -> Crimean Turkish because the Albanian language definitions do not have an Albanian-language version of the language name

]]

local function _is_code (code, target_lang_code) code = mw.language.fetchLanguageName (code, target_lang_code); return ~= code; end


--[[--------------------------< _ _ V A L I D A T E _ T A R G E T _ L A N G _ C O D E >------------------------

validates target_lang_code as a know language code; returns two values when target_lang_code is valid, first return value holds target_lang_code; second return value is nil when target_lang_code is invalid, first retrun value is nil; second return value has error message

if target_lang_code argument is nil, (missing or empty in the invoke) use local wiki's language code

]]

local function __validate_target_lang_code (target_lang_code) local msg;

if target_lang_code then -- not missing or empty if not _is_code (target_lang_code) then -- validate target_lang_code msg = err_msg_make ('target language code: ' .. target_lang_code); target_lang_code = nil; -- unset as invalid end end if not target_lang_code then -- if nil because missing or empty or because invlaid and we set it nil target_lang_code = mw.getContentLanguage():getCode(); -- use local wiki's language code end

return target_lang_code, msg; -- target_lang_code is valid or nil; msg is nil or has an error message end


--[[--------------------------< I S _ C O D E >----------------------------------------------------------------

module entry point

args[1]: language code -> args[2]: optional target language code; same as <target lang code> in ; defaults to the local wiki language

return true if is a mediawiki recognized code; nil else

]]

local function is_code (frame) local args = getArgs (frame, { valueFunc = function (key, value) return (value and ~= value) and value:lower():gsub ('^%s*(.-)%s*$', '%1') or nil; end }); local code = args[1]; local target_lang_code = __validate_target_lang_code (args[2]);

return code and _is_code (code, target_lang_code) and true or nil; end


--[[--------------------------< N A M E _ F R O M _ C O D E >--------------------------------------------------

module entry point

args[1]: language code args[2]: optional target language code; same as <target lang code> in ; defaults to the local wiki language

return language-name if language-code is a mediawiki recognized code; error message string else

returned language name not guarenteed to be in target_lang_code (if specified), because mw language lists are incomplete

]]

local function name_from_code (frame) local args = getArgs (frame, { valueFunc = function (key, value) return (value and ~= value) and value:lower():gsub ('%s*(.-)%s*', '%1') or nil; end }); local code = args[1]; if not code then return err_msg_make ('code: (empty)'); end

local target_lang_code, msg = __validate_target_lang_code (args[2]); if msg then return msg; end

local name = mw.language.fetchLanguageName (code, target_lang_code); -- returns empty string if code not found return ~= name and name or err_msg_make ('language code: ' .. code); -- return language name or error message end


--[[--------------------------< C O D E _ F R O M _ N A M E >--------------------------------------------------

local entry point

args[1]: language name args[2]: optional target language code; instruct this function to fetch language name list in 'this' language

return language-code if language-name is a mediawiki recognized name and target language code is valid; error message string else

second return value is a boolean used by is_name(); true when name is found; false else

]]

local function _code_from_name (args) local name = args[1]; if not name then return err_msg_make ('name: (empty)'); end

local target_lang_code, msg = __validate_target_lang_code (args[2]);

if msg then return msg; end

local code_name_list = mw.language.fetchLanguageNames (target_lang_code, 'all'); -- get language code / name list in target_lang_code language indexed by language code local name_code_list = {}; -- to hold language name / code list indexed by name

for k, v in pairs (code_name_list) do -- spin through the code / name list and name_code_list[v:lower()] = k; -- make a name / code list end

if name_code_list[name] then return name_code_list[name], true; -- returns code when name is found and true for is_name() else return err_msg_make ('language name: ' .. name), false; -- return error message when name not found and false for is_name() end end


--[[--------------------------< C O D E _ F R O M _ N A M E >--------------------------------------------------

module entry point

args[1]: language name args[2]: optional target language code; instruct this function to fetch language name list in 'this' language

return language-code if language-name is a mediawiki recognized name and target language code is valid; error message string else

]]

local function code_from_name (frame) local args = getArgs (frame, { valueFunc = function (key, value) return (value and ~= value) and value:lower():gsub ('^%s*(.-)%s*$', '%1') or nil; end });

local result, _ = _code_from_name (args); -- suppress true/false return used by is_name() return result; end


--[[--------------------------< I S _ N A M E >----------------------------------------------------------------

return true if <name> is a mediawiki recognized language name; false else

args[1]: language name args[2]: optional target language code; instructs _code_from_name to fetch language name list in 'this' language defaults to local wiki's language; when this parameter not valid, language name is assumed to be not valid

]]

local function is_name (frame) local args = getArgs (frame, { valueFunc = function (key, value) return (value and ~= value) and value:lower():gsub ('%s*(.-)%s*', '%1') or nil; end });

local _, result = _code_from_name (args); -- suppress code return used by code_from_name() return result and true or nil; end


--[[--------------------------< E X P O R T E D F U N C T I O N S >------------------------------------------ ]]

return { code_from_name = code_from_name, is_code = is_code, is_name = is_name, name_from_code = name_from_code,

_is_code = _is_code, -- entry point from another module }