Module:Lang

--[=[

Lua support for the and  templates and replacement of various supporting templates.

]=]

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

local initial_style_state;														-- set by lang_xx_normal and lang_xx_italic

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

local synonym_table = mw.loadData ('Module:Lang/ISO 639 synonyms');				-- ISO 639-2/639-2T code translation to 639-1 code

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

local maint_cats = {};															-- maintenance categories go here local maint_msgs = {};															-- and their messages go here

--[[--< 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

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

validates |italic= assigned values.

When |italic= is set and has an acceptible assigned value, return the matching css font-style property value or, for the special case 'default', return nil.

When |italic= is not set, or has an unacceptible assigned value, return nil.

The return value nil causes the calling lang or lang_xx function to set args.italic according to the or template's defined default ('normal' for, 'normal' or 'italic' for  depending on the individual template's requirements) or to the value appropriate to |script=, if set.

Accepted values and the values that this function returns are are: nil - when |italic= absent or not set; returns nil default - for completeness, should rarely if ever be used; returns nil yes - force args.text to be rendered in italic font; returns 'italic' no - force args.text to be rendered in normal font; returns 'normal' unset - disables font control so that font-style applied to text is dictated by surrounding markup; returns 'inherit'

]]

local function validate_italic (italic) local properties = {['yes'] = 'italic', ['no'] = 'normal', ['unset'] = 'inherit', ['default'] = nil};

return properties[italic]; 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 private subtag - x- followed by 1-8 alnum private code; only supported with the primary language tag

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 lang-x-private each of lang, script, region, variant, and private, when used, must be valid

Languages with both two- and three-character code synonyms are promoted to the two-character synonym because the IANA registry file omits the synonymous three-character code; we cannot depend on browsers understanding the synonymous three-character codes in the lang= attribute.

For templates, the parameters |script=, |region=, and |variant= are supported (not supported in because those parameters are superfluous to the IETF subtags in |code=)

returns six values. Valid parts are returned as themselves; omitted parts are returned as empty strings, invalid parts are returned as nil; the sixth returned item is an error message (if an error detected) or nil.

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

]]

local function get_ietf_parts (source, args_script, args_region, args_variant) local code; local script = ''; local region = ''; local variant = ''; local private = ''; local c;	if not is_set (source) then return nil, nil, nil, nil, nil, 'missing language tag'; end

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

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

elseif source:match ('^%a%a%a?%-x%-[%a%d][%a%d]?[%a%d]?[%a%d]?[%a%d]?[%a%d]?[%a%d]?[%a%d]?$') then		-- ll-x-pppppppp)		code, private = source:match ('^(%a%a%a?)%-x%-([%a%d]+)$');

else return nil, nil, nil, nil, nil, table.concat ({'unrecognized language tag: ', source});		-- 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, nil, table.concat ({'unrecognized language code: ', code});		-- invalid language code, don't know about the others (don't care?) end if synonym_table[code] then													-- if 639-2/639-2T code has a 639-1 synonym table.insert (maint_cats, table.concat ({'Lang and lang-xx code promoted to ISO 639-1|', code})); table.insert (maint_msgs, table.concat ({'code: ', code, ' promoted to code: ', synonym_table[code]})); code = synonym_table[code];												-- use the synonym end

if is_set (script) then if is_set (args_script) then return code, nil, nil, nil, nil, 'redundant script tag';					-- both code with script and |script= not allowed end else script = args_script or '';												-- use args.script if provided end

if is_set (script) then script = script:lower;												-- ensure that we use and return lower case version of this if not lang_name_table.script[script] then return code, nil, nil, nil, nil, table.concat ({'unrecognized script: ', script, ' for code: ', code});	-- language code ok, invalid script, don't know about the others (don't care?) end end --	if lang_name_table.suppressed[script] then									-- ensure that code-script does not use a suppressed script --		if in_array (code, lang_name_table.suppressed[script]) then --			return code, nil, nil, nil, table.concat ({'script: ', script, ' not supported for code: ', code});	-- language code ok, script is suppressed for this code --		end --	end

if is_set (region) then if is_set (args_region) then return code, nil, nil, nil, nil, 'redundant region tag';					-- both code with region and |region= not allowed end else region = args_region or '';												-- use args.region if provided end

if is_set (region) then region = region:lower;												-- ensure that we use and return lower case version of this if not lang_name_table.region[region] then return code, script, nil, nil, nil, table.concat ({'unrecognized region: ', region, ' for code: ', code}); end end if is_set (variant) then if is_set (args_variant) then return code, nil, nil, nil, nil, 'redundant variant tag';				-- both code with variant and |variant= not allowed end else variant = args_variant or '';											-- use args.variant if provided end

if is_set (variant) then variant = variant:lower;												-- ensure that we use and return lower case version of this if not lang_name_table.variant[variant] then							-- make sure variant is valid return code, script, region, nil, nil, table.concat ({'unrecognized variant: ', variant}); end																		-- does this duplicate/replace tests in lang and lang_xx? if is_set (script) then													-- if script set it must be part of the 'prefix' if not in_array (table.concat ({code, '-', script}), lang_name_table.variant[variant]['prefixes']) then return code, script, region, nil, nil, table.concat ({'unrecognized variant: ', variant, ' for code-script pair: ', code, '-', script}); end else if not in_array (code, lang_name_table.variant[variant]['prefixes']) then return code, script, region, nil, nil, table.concat ({'unrecognized variant: ', variant, ' for code: ', code}); end end end if is_set (private) then private = private:lower;												-- ensure that we use and return lower case version of this if not lang_data.override[table.concat ({code, '-x-', private})] then	-- make sure private tag is valid; note that index return code, script, region, nil, nil, table.concat ({'unrecognized private tag: ', private}); end end return code, script, region, variant, private, nil;							-- return the good bits; make sure that msg is nil 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, ' error: '); table.insert (out, msg); table.insert (out, ' (help)') table.insert (out, ' '); if (0 == namespace) and not is_set (nocat) then								-- only categorize in article space table.insert (out, ''); 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 ({, display, }); else return table.concat ({, link, }); end else return ''; end end

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

TODO: add support for block: div tags instead of span tags; would need some sort of proper parameter to control the switch

]]

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

table.insert (span, '');													-- close the style and close opening span tag	table.insert (span, text);													-- insert the text

--	if is_set (size) then														-- 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, ' ');												-- 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 >

TODO: figure out how to correctly support collective language codes: sem, Semitic languages (collective names appear to always include the word 'languages').. May need new categories so that the category names are sensible.

]]

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 ... where xx is the language code; else return empty string

The value |script= is not used in for this purpose; instead it uses |code. Because language scripts are listed in the switches they are included in the data tables. The script parameter is introduced at. 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, "<i lang=\"");	table.insert (tout, code);	table.insert (tout, "-Latn\" title=\"");									-- transliterations are always Latin script	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, "");	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 ({': no text'}), args.nocat); end

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

TODO: this not required any longer? Parameter subtags |script=, |region=, and |variant= are all consolidated with code subtags, and validated, in get_ietf_parts.

]]

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 | = has a value if lang_name_table[name][args_subtag] then							-- and that value is legitimate subtag code_subtag = args_subtag;										-- then use | = else return nil, make_error_msg (table.concat ({': 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 ({': code / ' .. name .. ' mismatch: ', args_code:lower, ' / ', args_subtag}), nocat); end end

return code_subtag; end

--[[--< R E N D E R _ M A I N T >--

render mainenance messages and categories ]]

local function render_maint(nocat) local maint = {}; if 0 < #maint_msgs then table.insert (maint, table.concat ({' '})); for _, msg in ipairs (maint_msgs) do			table.insert (maint, table.concat ({msg, ' '})); end table.insert (maint, ' '); end if (0 < #maint_cats) and (0 == namespace) and not is_set (nocat) then for _, cat in ipairs (maint_cats) do			table.insert (maint, table.concat ({''})); end end return table.concat (maint); end

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


 * 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:
 * 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 (': conflicting: and |code=', args.nocat); else args.code = args[1] or args.code; end

if args[2] and args.text then return make_error_msg (': conflicting: 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

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

code, subtags.script, subtags.region, subtags.variant, subtags.private, msg = get_ietf_parts (args.code);	-- |script=, |region=, |variant= not supported because they should be part of args.code ( in )

if not (code and subtags.script and subtags.region and subtags.variant) then return make_error_msg (table.concat ({': ', msg}), args.nocat); end

args.italic = to_boolean(args.italic);										-- convert to boolean or nil: 'yes' -> true, 'no' -> false; else nil args.italic = validate_italic (args.italic);								-- nil or font-style property value

if nil == args.italic then													-- nil when |italic= absent or not set or |italic=default; args.italic controls if 'latn' == subtags.script then										-- script set to latn --			args.italic = true;													-- DEFAULT for templates is upright; but if latn script args.italic = 'italic';												-- DEFAULT for templates is upright; but if latn script set for font-style:italic else --			args.italic = false;												-- italic not set; script not latn args.italic = 'normal';												-- italic not set; script not latn; set for font-style:normal end end 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

args.code = format_ietf_tag (code, subtags.script, subtags.region, subtags.variant);	-- format to recommended subtag styles; private omitted because private

if is_set (subtags.private) and lang_data.override[table.concat ({code, '-x-', subtags.private})] then	-- look for private use tags language_name = lang_data.override[table.concat ({code, '-x-', subtags.private})][1]; elseif 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 (code, language_name, args.nocat)); table.insert (out, render_maint(args.nocat));											-- maintenance messages and categories

return table.concat (out);													-- put it all together and done end

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


 * 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 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, the positional parameters are: text transliterated text literal translation text

]]

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

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

if args[2] and args.translit then return make_error_msg (': conflicting: 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 (': conflicting: and |lit= or |translation=', args.nocat); elseif args.translation and args.lit then return make_error_msg (': 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 (': conflicting: |links= and |link=', args.nocat); else args.link = args.link or args.links; end

args.rtl = args.rtl == 'yes';												-- convert to boolean: 'yes' -> true, other values -> false

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

local translit_script; local translit; local translit_title; local msg;

code, subtags.script, subtags.region, subtags.variant, subtags.private, msg = get_ietf_parts (args.code, args.script, args.region, args.variant);	-- private omitted because private

if not (code and subtags.script and subtags.region and subtags.variant) then return make_error_msg (table.concat ({': ', msg}), args.nocat); end --	args.italic = to_boolean (args.italic);										-- convert to boolean or nil: 'yes' -> true, 'no' -> false; else nil args.italic = validate_italic (args.italic);								-- nil or font-style property value

--	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 templates is to italicize --		else --			args.italic = false;												-- italic not set; script not latn --		end --	end if nil == args.italic then													-- args.italic controls if is_set (subtags.script) then if 'latn' == subtags.script then args.italic = 'italic';											-- |script=Latn; set for font-style:italic else args.italic = initial_style_state;								-- italic not set; script is not latn; set for font-style: end else args.italic = initial_style_state;									-- here when |italic= and |script= not set; set for font-style: end end 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

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

args.code = format_ietf_tag (code, subtags.script, subtags.region, subtags.variant);	-- format to recommended subtag styles

if is_set (subtags.private) and lang_data.override[table.concat ({code, '-x-', subtags.private})] then	-- look for private use tags language_name = lang_data.override[table.concat ({code, '-x-', subtags.private})][1]; elseif lang_data.override[args.code:lower] then								-- first look for whole IETF tag in override table language_name = lang_data.override[args.code:lower][1]; elseif lang_data.override[code] then										-- not there so try basic language code language_name = lang_data.override[code][1]; elseif not is_set (subtags.variant) then if 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 else																		-- TODO: is this the right thing to do: take language display name from variants table? if lang_name_table.variant[subtags.variant] then						-- TODO: there is some discussion at Template talk:Lang about having a label parameter for use when variant name is not desired among other things language_name = lang_name_table.variant[subtags.variant]['descriptions'][1];	-- table entries sometimes have multiple names, always take the first one end 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 ); not supported in all table.insert (out, ', '); 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, 'translit. '); end table.insert (out, ' '); 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 ({': invalid translit-std: \, args['translit-std'] or 'missing', '\' or translit-script: \, args['translit-script'] or 'missing', '\''}), args.nocat); end end if is_set (args.translation) then											-- translation (not supported in ) table.insert (out, ', '); if 'no' == args.link then table.insert (out, 'lit. '); else table.insert (out, make_wikilink ('Literal translation', 'lit.')); end table.insert (out, " '"); table.insert (out, args.translation); table.insert (out, "'"); end table.insert (out, make_category (code, language_name, args.nocat)); table.insert (out, render_maint(args.nocat));											-- maintenance messages and categories

return table.concat (out);													-- put it all together and done end

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

Entry point for those templates that have not been converted to call either of lang_xx_normal or lang_xx_italic. Sets the initial style state to italic. When all template that use this module have been converted, this finction can go away.

]]

--function p.lang_xx (frame) --	initial_style_state = 'italic'; --	return _lang_xx (frame); --end

--[[--< L A N G _ X X _ I T A L I C >--

Entry point for those templates that have been converted to call lang_xx_italic. Sets the initial style state to italic.

]]

function p.lang_xx_italic (frame) initial_style_state = 'italic'; return _lang_xx (frame); end

--[[--< L A N G _ X X _ N O R M A L >--

Entry point for those templates that have been converted to call lang_xx_normal. Sets the initial style state to normal.

]]

function p.lang_xx_normal (frame) initial_style_state = 'normal'; return _lang_xx (frame); end

return p;