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This Lua module is used on approximately 1,550,000 pages.
To avoid major disruption and server load, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own module sandbox. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them.
This module depends on the following other modules:
This module exists primarily to provide correct html markup for non–English language text where that text is used in the English Wikipedia. It has a secondary purpose of providing correct visual rendering for this non-English text. The module was developed to consolidate processing for {{Lang}}, the {{lang-??}} (most), and {{Transl}} templates into a single source and to use a clearly defined data set extracted from international standards. It provides error checking and reporting to ensure that the html rendered is correct for browsers and screen readers.
Other templates that get language name support from this module are:
{{Native name}}
Data set

The data set is specified in Module:Lang/data and its included data modules:
language tag-and-name data
- Module:Lang/data/iana languages – from IANA language-subtag-registry file
language script data
- Module:Lang/data/iana scripts – from IANA language-subtag-registry file
language region data
- Module:Lang/data/iana regions – from IANA language-subtag-registry file
language variant data
- Module:Lang/data/iana variants – from IANA language-subtag-registry file
suppressed-script data
- Module:Lang/data/iana suppressed scripts – from IANA language-subtag-registry file
The data set also includes supplementary data modules:
override and other non-standard data
- Module:Lang/ISO 639 synonyms – maps three character ISO 639-2, -2T, -3 codes to two character ISO 639-1 codes – from Codes for the Representation of Names of Languages
- Module:Lang/tag from name – reversed language tag-and-name data so that the language name is the key and the language tag is the value
Testcases

Tracking categories

--[=[

Lua support for the {{lang}} and {{lang-xx}} templates and replacement of various supporting templates. 

]=]

require('Module:No globals');
local p = {};

local getArgs = require ('Module:Arguments').getArgs;
local lang_name_table = mw.loadData ('Module:Language/name/data');

local lang_data =  mw.loadData ('Module:Lang/data');							-- language name override and transliteration tool-tip tables

local namespace = mw.title.getCurrentTitle().namespace;							-- used for categorization


--[[--------------------------< I S _ S E T >------------------------------------------------------------------

Returns true if argument is set; false otherwise. Argument is 'set' when it exists (not nil) or when it is not an empty string.

]]

local function is_set( var )
	return not (var == nil or var == '');
end

--[[--------------------------< T O _ B O O L E A N >----------------------------------------------------------
Returns true for 'yes', false for 'no', and nil for any other value.
]]

local function to_boolean (param)
	if param == 'yes' then
		return true
	elseif param == 'no' then
		return false
	else
		return nil
	end
end


--[[--------------------------< I N _ A R R A Y >--------------------------------------------------------------

Whether needle is in haystack

]]

local function in_array( needle, haystack )
	if needle == nil then
		return false;
	end
	for n,v in ipairs( haystack ) do
		if v == needle then
			return n;
		end
	end
	return false;
end


--[[--------------------------< F O R M A T _ I E T F _ T A G >------------------------------------------------

prettify ietf tags to use recommended subtag formats:
	code: lower case
	script: sentence case
	region: upper case
	variant: lower case

]]

local function format_ietf_tag (code, script, region, variant)
	local out = {};
	local c;
	
	table.insert (out, code:lower());
	if is_set (script) then
		c = script:match ('^%a'):upper();										-- make script sentence case
		script = script:lower():gsub ('^%a', c, 1);
		table.insert (out, script);
	end

	if is_set (region) then
		table.insert (out, region:upper());
	end
	
	if is_set (variant) then
		table.insert (out, variant:lower());
	end
	
	return table.concat (out, '-');
end


--[[--------------------------< G E T _ I E T F _ P A R T S >--------------------------------------------------

extracts and returns IETF language tag parts:
	primary language subtag (required) - 2 or 3 character IANA language code
	script subtag - four character IANA script code
	region subtag - two-letter or three digit IANA region code
	variant subtag - four digit or 5-8 alnum variant code

in any one of these forms
	lang					lang-variant
	lang-script				lang-script-variant
	lang-region				lang-region-variant
	lang-script-region		lang-script-region-variant
	
each of lang, script, region, and variant, when used, must be valid

returns four values.  Valid parts are returned as themselves; omitted parts are returned as empty strings, invalid
parts are returned as nil.

see http://www.rfc-editor.org/rfc/bcp/bcp47.txt section 2.1

]]

local function get_ietf_parts (source)
	local code;
	local script = '';
	local region = '';
	local variant = '';
	local c;
	
	if not is_set (source) then
		return nil, nil, nil, nil;
	end
	
	if source:match ('^%a+%-%a%a%a%a%-%a%a%-(%d%d%d%d+$') then												-- ll-Ssss-RR-variant (where variant is 4 digits)
		code, script, region, variant = source:match ('^(%a%a%a?)%-(%a%a%a%a)%-(%a%a)%-(%d%d%d%d)$');
	elseif source:match ('^%a+%-%a%a%a%a%-%d%d%d%-(%d%d%d%d+$') then										-- ll-Ssss-DDD-variant (where region is 3 digits; variant is 4 digits)
		code, script, region, variant = source:match ('^(%a%a%a?)%-(%a%a%a%a)%-(%d%d%d)%-(%d%d%d%d)$');
	elseif source:match ('^%a+%-%a%a%a%a%-%a%a%-[%a%d][%a%d][%a%d][%a%d][%a%d]+$') then						-- ll-Ssss-RR-variant (where variant is 5-8 alnum characters)
		code, script, region, variant = source:match ('^(%a%a%a?)%-(%a%a%a%a)%-(%a%a)%-([%a%d][%a%d][%a%d][%a%d][%a%d][%a%d]?[%a%d]?[%a%d]?)$');
	elseif source:match ('^%a+%-%a%a%a%a%-%d%d%d%-[%a%d][%a%d][%a%d][%a%d][%a%d]+$') then						-- ll-Ssss-DDD-variant (where region is 3 digits; variant is 5-8 alnum characters)
		code, script, region, variant = source:match ('^(%a%a%a?)%-(%a%a%a%a)%-(%d%d%d)%-([%a%d][%a%d][%a%d][%a%d][%a%d][%a%d]?[%a%d]?[%a%d]?)$');

	elseif source:match ('^%a+%-%a%a%a%a%-(%d%d%d%d+$') then												-- ll-Ssss-variant (where variant is 4 digits)
		code, script, variant = source:match ('^(%a%a%a?)%-(%a%a%a%a)%-(%d%d%d%d)$');
	elseif source:match ('^%a+%-%a%a%a%a%-[%a%d][%a%d][%a%d][%a%d][%a%d]+$') then							-- ll-Ssss-variant (where variant is 5-8 alnum characters)
		code, script, variant = source:match ('^(%a%a%a?)%-(%a%a%a%a)%-([%a%d][%a%d][%a%d][%a%d][%a%d][%a%d]?[%a%d]?[%a%d]?)$');

	elseif source:match ('^%a+%-%a%a%-(%d%d%d%d+$') then													-- ll-RR-variant (where variant is 4 digits)
		code, region, variant = source:match ('^(%a%a%a?)%-(%a%a)%-(%d%d%d%d)$');
	elseif source:match ('^%a+%-%d%d%d%-(%d%d%d%d+$') then													-- ll-DDD-variant (where region is 3 digits; variant is 4 digits)
		code, region, variant = source:match ('^(%a%a%a?)%-(%d%d%d)%-(%d%d%d%d)$');
	elseif source:match ('^%a+%-%a%a%-[%a%d][%a%d][%a%d][%a%d][%a%d]+$') then								-- ll-RR-variant (where variant is 5-8 alnum characters)
		code, region, variant = source:match ('^(%a%a%a?)%-(%a%a)%-([%a%d][%a%d][%a%d][%a%d][%a%d][%a%d]?[%a%d]?[%a%d]?)$');
	elseif source:match ('^%a+%-%d%d%d%-[%a%d][%a%d][%a%d][%a%d][%a%d]+$') then								-- ll-DDD-variant (where region is 3 digits; variant is 4 digits)
		code, region, variant = source:match ('^(%a%a%a?)%-(%d%d%d)%-([%a%d][%a%d][%a%d][%a%d][%a%d][%a%d]?[%a%d]?[%a%d]?)$');

	elseif source:match ('^%a+%-(%d%d%d%d+)$') then								-- ll-variant (where variant is 4 digits)
		code, variant = source:match ('^(%a%a%a?)%-(%d%d%d%d)$');
	elseif source:match ('^%a+%-[%a%d][%a%d][%a%d][%a%d][%a%d]+$') then			-- ll-variant (where variant is 5-8 alnum characters)
		code, variant = source:match ('^(%a%a%a?)%-([%a%d][%a%d][%a%d][%a%d][%a%d][%a%d]?[%a%d]?[%a%d]?)$');

	elseif source:match ('^%a+%-%a%a%a%a%-%a%a$') then							-- ll-Ssss-RR
		code, script, region = source:match ('^(%a%a%a?)%-(%a%a%a%a)%-(%a%a)$');
	elseif source:match ('^%a+%-%a%a%a%a%-%d%d%d$') then						-- ll-Ssss-DDD (region is 3 digits)
		code, script, region = source:match ('^(%a%a%a?)%-(%a%a%a%a)%-(%d%d%d)$');

	elseif source:match ('^%a+%-%a%a%a%a$') then								-- ll-Ssss
		code, script = source:match ('^(%a%a%a?)%-(%a%a%a%a)$');

	elseif source:match ('^%a+%-%a%a$') then									-- ll-RR
		code, region = source:match ('^(%a%a%a?)%-(%a%a)$');
	elseif source:match ('^%a+%-%d%d%d$') then									-- ll-DDD (region is 3 digits)
		code, region = source:match ('^(%a%a%a?)%-(%d%d%d)$');

	elseif source:match ('^%a+$') then											-- ll
		code = source:match ('^(%a%a%a?)$');

	elseif source:match ('^1%a+$') then											-- special case for two Linguist list identifiers in Module:Lang/data override table
		code = source:match ('^(1%a%a)$');										-- these may need tweaks in future if other alphanumeric Linguist list identifiers are added

	else
		return nil, nil, nil, nil;												-- don't know what we got but it is malformed
	end
	
	code = code:lower();														-- ensure that we use and return lower case version of this
	
	if not (lang_data.override[code] or lang_name_table.lang[code]) then
		return nil, nil, nil, nil;												-- invalid language code, don't know about the others (don't care?)
	end
	
	script = script:lower();													-- ensure that we use and return lower case version of this

	if is_set (script) then
		if not lang_name_table.script[script] then
			return code, nil, nil, nil;											-- language code ok, invalid script, don't know about the others (don't care?)
		end
	end
	
	if is_set (region) then
		if not lang_name_table.region[region:lower()] then
			return code, script, nil, nil;
		end
	end
	
	variant = variant:lower();													-- ensure that we use and return lower case version of this

	if is_set (variant) then
		if not lang_name_table.variant[variant] then
			return code, script, region, nil;
		end
		if not in_array (code, lang_name_table.variant[variant]['prefixes']) then
			return code, script, region, nil;
		end
	end

	return code, script, region, variant;										-- return the good bits
end


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

]=]

local function make_error_msg (msg, nocat)
	local out = {};
	
	table.insert (out, '<span style="font-size:100%" class="error">error: ');
	table.insert (out, msg);
	table.insert (out, ' ([[:Category:lang and lang-xx template errors|help]])')
	table.insert (out, '</span>');
	
	if (0 == namespace) and not is_set (nocat) then								-- only categorize in article space
		table.insert (out, '[[Category:lang and lang-xx template errors]]');
	end

	return table.concat (out);
end
	

--[=[-------------------------< M A K E _ W I K I L I N K >----------------------------------------------------

Makes a wikilink; when both link and display text is provided, returns a wikilink in the form [[L|D]]; if only
link is provided, returns a wikilink in the form [[L]]; if neither are provided or link is omitted, returns an
empty string.

]=]

local function make_wikilink (link, display)
	if is_set (link) then
		if is_set (display) then
			return table.concat ({'[[', link, '|', display, ']]'});
		else
			return table.concat ({'[[', link, ']]'});
		end
	else
		return '';
	end
end


--[[--------------------------< M A K E _ T E X T _ S P A N >--------------------------------------------------

]]

local function make_text_span (code, text, rtl, italic, size)
	local span = {};

	table.insert (span, '<span lang="');										-- open <span> tag
	table.insert (span,  code);													-- language attribute
	table.insert (span, '"');
	if rtl then
		table.insert (span, ' dir="rtl"');										-- for right to left languages
	end
	if is_set (size) then														-- {{lang}} only
		table.insert (span, table.concat ({' style="font-size:', size, ';"'}))
	end
	table.insert (span, '>');													-- close the opening span tag
	if italic then
		table.insert (span, table.concat ({"''", text, "''"}));					-- text with italic markup
	else
		table.insert (span, text);												-- DEFAULT: text is not italicized
	end
	table.insert (span, '</span>');												-- close the span
	if rtl then
		table.insert (span, '&lrm;');											-- make sure the browser knows that we're at the end of the rtl
	end
	
	return table.concat (span);													-- put it all together and done
end


--[[--------------------------< M A K E _ C A T E G O R Y >----------------------------------------------------

]]

local function make_category (code, language_name, nocat)
	local cat = {};
	
	if (0 ~= namespace) or nocat then											-- only categorize in article space
		return '';																-- return empty string for concatenation
	end
	
	table.insert (cat, '[[Category:Articles containing ');
	
	if ('en' == code) or ('eng' == code) then
		table.insert (cat, 'explicitly cited English');
	elseif 'art' == code then
		table.insert (cat, 'constructed')
	else
		table.insert (cat, language_name);
	end
	
	table.insert (cat, '-language text]]');

	return table.concat (cat);	
end


--[[--------------------------< M A K E _ T R A N S L I T >----------------------------------------------------

return translit <span>...</span> else return empty string

The value |script= is not used in {{transl}} for this purpose; instead it uses |code.  Because language scripts
are listed in the {{transl}} switches they are included in the data tables.  The script parameter is introduced
at {{Language with name and transliteration}}.  If |script= is set, this function uses it in preference to code.

To avoid confusion, in this module and the templates that use it, the transliteration script parameter is renamed
to be |translit-script= (in this function, tscript)
]]

local function make_translit (code, language_name, translit, std, tscript)
	local title;
	local tout = {};
	local title_table = lang_data.translit_title_table;							-- table of transliteration standards and the language codes and scripts that apply to those standards
	
	table.insert (tout, "''<span lang=\"");
	table.insert (tout, code);
	table.insert (tout, "-Latn\" title=\"");
	
	if not is_set (std) and not is_set (tscript) then							-- when neither standard nor script specified
		table.insert (tout, language_name);										-- write a generic tool tip
		table.insert (tout, ' transliteration');
	elseif is_set (std) and is_set (tscript) then								-- when both are specified
		if title_table[std][tscript] then										-- and legitimate
			table.insert (tout, title_table[std][tscript]);						-- add the appropriate text to the tool tip
		else
			return '';															-- one or both invalid, set up for an error message
		end
	elseif is_set (std) then													-- translit-script not set, use language code
		if not title_table[std] then return ''; end								-- invalid standard, setupt for error message
		
		if title_table[std][code] then
			table.insert (tout, title_table[std][code]);
		else																	-- code doesn't match
			table.insert (tout, title_table[std]['default']);					-- so use the standard's default
		end
	else																		-- here if translit-script set but translit-std not set
		if title_table['NO_STD'][tscript] then
			table.insert (tout, title_table['NO_STD'][tscript]);				-- use translit-script if set
		elseif title_table['NO_STD'][code] then
			table.insert (tout, title_table['NO_STD'][code]);					-- use language code
		else
			table.insert (tout, language_name);									-- write a generic tool tip
			table.insert (tout, ' transliteration');
		end
	end

	table.insert (tout, '">');
	table.insert (tout, translit);
	table.insert (tout, "</span>''");
	return table.concat (tout);
end


--[[--------------------------< V A L I D A T E _ T E X T >---------------------------------------------------

This function checks the content of args.text and returns empty string if nothing is amiss else it returns an
error message.  The tests are for empty or missing text and for improper or disallowed use of apostrophe markup.

Italic rendering is controlled by the |italic= template parameter so italic markup should never appear in args.text
either as ''itself''' or as '''''bold italic'''''.

Also protects single leading and trailing single quote marks from being converted to bold by the addition of
adjacent italic markup.

]]

local function validate_text (template, args)
	if not is_set (args.text) then
		return make_error_msg (table.concat ({'{{', template, '}}: no text'}), args.nocat);
	end

	if 'lang-xx' == template then												-- for the time being, this error checking does not apply to {{lang}}
		if args.text:find ("\'\'\'\'\'[\']+") then								-- because we're looking, look for 6+ appostrophes
			return make_error_msg (table.concat ({'{{', template, '}}: text has malformed markup'}), args.nocat);
		end
	
		if args.text:match ("%f[\']\'\'[^\']+\'\'%f[^\']") or args.text:match ("\'\'\'\'\'[^\']+\'\'\'\'\'") then	-- italic but not bold, or bold italic
			return make_error_msg (table.concat ({'{{', template, '}}: text has italic markup'}), args.nocat);
		end
	
		if args.text:find ("\'\'\'\'") then										-- because we're looking, look for 4 apostrophes 
			return make_error_msg (table.concat ({'{{', template, '}}: text has malformed markup'}), args.nocat);
		end
	
		if args.italic then														-- protect single quote marks from being converted to bold markup
			args.text = args.text:gsub ("^\'[^\']+", "<span></span>%1");		-- leading single quote mark
			args.text = args.text:gsub ("[^\']+\'$", "%1<span></span>");		-- trailing single quote mark
		end
	end
end


--[[--------------------------< S U B T A G _ C H E C K >------------------------------------------------------

checks the subtags: script, region, and variant to be valid and in agreement with any tags that are included in
the main language code: if |script=Cyrl and language code is 'abq-Cyrl' the two script must agree (case insensitive)

returns the selected subtag and nil error message;
returns empty string and nil error message when both language code subtag and matching subtag parameter are not set
returns nil and error message else

]]

local function subtag_check (name, args_code, code_subtag, args_subtag, nocat)

	if not is_set (code_subtag) and not is_set (args_subtag) then				-- no subtags, then bale
		return '';																-- empty string for concatenation
	end
	
	args_subtag = args_subtag and args_subtag:lower();							-- so we only need do this once; prettify later
	if not is_set (code_subtag) then											-- if no ietf subtag in args.code
		if is_set (args_subtag) then											-- and if |<name>= has a value
			if lang_name_table[name][args_subtag] then							-- and that value is legitimate subtag
				code_subtag = args_subtag;										-- then use |<name>=
			else
				return nil, make_error_msg (table.concat ({'{{lang-xx}}: invalid ' .. name .. ': ', args_subtag}), nocat);
			end
		end
	else																		-- here when language code has a subtag
		if is_set (args_subtag) and (code_subtag ~= args_subtag) then			-- if there is a subtag parameter then it must match
			return nil, make_error_msg (table.concat ({'{{lang-xx}}: code / ' .. name .. ' mismatch: ', args_code:lower(), ' / ', args_subtag}), nocat);
		end
	end

	return code_subtag;
end


--[[--------------------------< L A N G >----------------------------------------------------------------------

<includeonly>{{#invoke:lang|lang|code={{{1|}}}|text={{{2|}}}|rtl={{{rtl|}}}|italic={{{italic|}}}|size={{{size|}}}|nocat={{{nocat|}}}}}</includeonly>

|code = the BCP47 language code
|text = the displayed text in language specified by code
|rtl = boolean true identifies the language specified by code as a right-to-left language
|size = css keyword appropriate for use with css font-size:<size>
|nocat = boolean true inhibits normal categorization; error categories are not affected

]]

function p.lang (frame)
	local args = getArgs(frame);
	
	if args[1] and args.code then
		return make_error_msg ('{{lang}}: conflicting: {{{1}}} and |code=', args.nocat);
	else
		args.code = args[1] or args.code;
	end

	if args[2] and args.text then
		return make_error_msg ('{{lang}}: conflicting: {{{2}}} and |text=', args.nocat);
	else
		args.text = args[2] or args.text;
	end
	
	args.rtl = args.rtl == 'yes';												-- convert to boolean: 'yes' -> true, other values -> false
	args.italic = to_boolean(args.italic);										-- convert to boolean or nil: 'yes' -> true, 'no' -> false; else nil
	
	local out = {};
	local language_name;
	local subtags = {};
	local code;

	code, subtags.script, subtags.region, subtags.variant = get_ietf_parts (args.code);
	
	if not (code and subtags.script and subtags.region and subtags.variant) then
		return make_error_msg (table.concat ({'{{lang}}: unknown language code: ', args.code or 'missing'}), args.nocat);
	end

	local msg = validate_text ('lang', args);									-- ensure that |text= is set  (italic test disabled for the time being)
	if is_set (msg) then
		return msg;
	end

	if is_set (subtags.script) then												-- if script set override rtl setting
		if in_array (subtags.script, lang_data.rtl_scripts) then
			args.rtl = true;													-- script is an rtl script
		else
			args.rtl = false;													-- script is not an rtl script
		end
	end
	
	if is_set (subtags.variant) then											-- special case test for |variant=
		if not in_array (code, lang_name_table.variant[subtags.variant]['prefixes']) then
			return make_error_msg (table.concat ({'{{lang}}: invalid code-variant combination: ', code, '-', subtags.variant}), args.nocat);
		end
	end

	if not args.italic then											-- args.italic controls
		if 'latn' == subtags.script then										-- script set to latn
			args.italic = true;													-- DEFAULT for {{lang}} templates is upright; but if latn script
		else
			args.italic = false;												-- italic not set; script not latn
		end
	end
	
	args.code = format_ietf_tag (code, subtags.script, subtags.region, subtags.variant);	-- format to recommended subtag styles

	if lang_data.override[code] then
		language_name = lang_data.override[code][1]
	elseif lang_name_table.lang[code] then
		language_name = lang_name_table.lang[code][1];							-- table entries sometimes have multiple names, always take the first one
	end

	table.insert (out, make_text_span (args.code, args.text, args.rtl, args.italic, args.size));
	table.insert (out, make_category (args.code, language_name, args.nocat));
	return table.concat (out);													-- put it all together and done
	end


--[[--------------------------< L A N G _ X X >----------------------------------------------------------------

<includeonly>{{#invoke:lang|lang_xx
|code=<code>
|script={{{script|}}}
|region={{{region|}}}
|variant={{{variant|}}}
|text={{{1|}}}
|link={{{links|{{{link}}}}}}
|rtl={{{rtl|}}}
|nocat={{{nocat|}}}
|italic={{{italic|}}}
|translation={{{lit|}}}
|translit={{{translit|}}}
|translit-script={{{translit-script|}}}
|translit-std={{{translit-std|}}}}}</includeonly>

|code = (required) the BCP47 language code
|script = BCP47 script name; especially for use with languages that use multiple writing systems; yields to the script subtag in |code= if present [not yet implemented]
|text = (required) the displayed text in language specified by code
|link = boolean true (default) links language specified by code to associated language article
|rtl = boolean true identifies the language specified by code as a right-to-left language
|nocat = boolean true inhibits normal categorization; error categories are not affected
|italic = boolean true (default) renders displayed text in italic font; when |italic= not set and |script= set to something other than Latn then args.italic='no' [not yet implemented]
|lit = text that is a literal translation of text

for those {{lang-xx}} templates that support transliteration:
|translit = text that is a transliteration of text
|translit-std = the standard that applies to the transliteration
|translit-script = ISO 15924 script name; falls back to code

For {{lang-xx}}, the positional parameters are:
	{{{1}}}	text
	{{{2}}}	transliterated text
	{{{3}}}	literal translation text

]]

function p.lang_xx (frame)
	local args = getArgs(frame, {parentFirst= true});							-- parameters in the template override parameters set in the {{#invoke:}}; is that the right thing to do?

	if args[1] and args.text then
		return make_error_msg ('{{lang-xx}}: conflicting: {{{1}}} and |text=', args.nocat);
	else
		args.text = args[1] or args.text;
	end

	if args[2] and args.translit then
		return make_error_msg ('{{lang-xx}}: conflicting: {{{2}}} and |translit=', args.nocat);
	else
		args.translit = args[2] or args.translit
	end
	
	if args[3] and (args.translation or args.lit) then
		return make_error_msg ('{{lang-xx}}: conflicting: {{{3}}} and |lit= or |translation=', args.nocat);
	elseif args.translation and args.lit then
		return make_error_msg ('{{lang-xx}}: conflicting: |lit= and |translation=', args.nocat);
	else
		args.translation = args[3] or args.translation or args.lit;
	end

	if args.links and args.link then
		return make_error_msg ('{{lang-xx}}: conflicting: |links= and |link=', args.nocat);
	else
		args.link = args.link or args.links;
	end

	args.size = nil;															-- size not supported in {{lang-xx}}
	
	args.rtl = args.rtl == 'yes';												-- convert to boolean: 'yes' -> true, other values -> false
	args.italic = args.italic == 'yes';

	local out = {};
	local language_name;
	local subtags = {};
	local code;

	local translit_script;
	local translit;
	local translit_title;

	code, subtags.script, subtags.region, subtags.variant = get_ietf_parts (args.code);
	
	if not (code and subtags.script and subtags.region and subtags.variant) then
		return make_error_msg (table.concat ({'{{lang-xx}}: unknown language code: ', args.code or 'missing'}), args.nocat);
	end
	
	local msg = validate_text ('lang-xx', args);								-- ensure that |text= is set, does not contain italic markup and is protected from improper bolding
	if is_set (msg) then
		return msg;
	end

	for name, value in pairs (subtags) do										-- spin through the subtags table and consolidate code and parameter-provided language subtags
		subtags[name], msg = subtag_check (name, args.code, value, args[name], args.nocat);
		if not subtags[name] then
			return msg;															-- some sort of error detected, return the error message
		end
	end

	if is_set (subtags.script) then												-- if script set override rtl setting
		if in_array (subtags.script, lang_data.rtl_scripts) then
			args.rtl = true;													-- script is an rtl script
		else
			args.rtl = false;													-- script is not an rtl script
		end
	end
	
	if is_set (subtags.variant) then													-- special case test for |variant=
		if not in_array (code, lang_name_table.variant[subtags.variant]['prefixes']) then
			return make_error_msg (table.concat ({'{{lang-xx}}: invalid code-variant combination: ', code, '-', subtags.variant}), args.nocat);
		end
	end

	if args.italic == nil then													-- args.italic controls
		if not is_set (subtags.script) or ('latn' == subtags.script) then		-- script not set then default; script set to latn same
			args.italic = true;													-- DEFAULT for {{lang-xx}} templates is to italicize
		else
			args.italic = false;												-- italic not set; script not latn
		end
	end
	
	args.code = format_ietf_tag (code, subtags.script, subtags.region, subtags.variant);				-- format to recommended subtag styles

	if lang_data.override[code] then
		language_name = lang_data.override[code][1]
	elseif lang_name_table.lang[code] then
		language_name = lang_name_table.lang[code][1];							-- table entries sometimes have multiple names, always take the first one
	end

	translit_script = args['translit-script'] or language_name;					-- for translit prefer |trans-script= over language

	if 'no' == args.link then
		table.insert (out, language_name);										-- language name without wikilink
	else
		table.insert (out, make_wikilink (language_name .. ' language', language_name));	-- language name with wikilink
	end
	table.insert (out, ': ');													-- separator

	table.insert (out, make_text_span (args.code, args.text, args.rtl, args.italic, args.size))
	
	if is_set (args.translit) then												-- transliteration (not supported in {{lang}}); not supported in all {{lang-xx}}
		table.insert (out, ', <small>');
		translit_title = mw.title.makeTitle (0, 'Romanization of ' .. language_name)
		if translit_title.exists and ('no' ~= args.link) then
			table.insert (out, make_wikilink ('Romanization of ' .. translit_script or language_name, 'translit.'));
		else
			table.insert (out, '<abbr title="transliteration">translit.</abbr>');
		end
		table.insert (out, '&nbsp;</small>');
		translit = make_translit (args.code, language_name, args.translit, args['translit-std'], args['translit-script'])
		if is_set (translit) then
			table.insert (out, translit);
		else
			return make_error_msg (table.concat ({'{{lang-xx}}: invalid translit-std: \'', args['translit-std'] or 'missing', '\' or transli-script: \'', args['translit-script'] or 'missing', '\''}), args.nocat);
		end
	end
	
	if is_set (args.translation) then											-- translation (not supported in {{lang}})
		table.insert (out, ', <small>');
		if 'no' == args.link then
			table.insert (out, '<abbr title="literal translation">lit.</abbr>');
		else
			table.insert (out, make_wikilink ('Literal translation', 'lit.'));
		end
		table.insert (out, "&nbsp;</small>'");
		table.insert (out, args.translation);
		table.insert (out, "'");
	end
	
	table.insert (out, make_category (args.code, language_name, args.nocat));
	return table.concat (out);													-- put it all together and done
end

return p;
Language templates
Language names (ISO 639)
{{ISO 639 name}}
Interwiki links
{{Wikt-lang}} Module:Wikt-lang Module:Wikt-lang/data {{Interlanguage link}}
Foreign-language text
{{Lang}} {{Langx}} Module:Lang {{Transliteration}} {{Title language}} {{PIE}}
Other
{{IPA}}
v t e
Revision as of 04:46, 18 November 2017

Data set

Testcases

Tracking categories

See also
