Module:Lang

--[=[

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

]=]

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

local getArgs = require ('Module:Arguments').getArgs; local lang_name_table = require ('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

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

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

]]

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

table.insert (span, '');													-- close the opening span tag if 'yes' == 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 'yes' == 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 ... 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.

]]

local function make_translit (code, language_name, translit, std, script) 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 title=\"");	if not is_set (std) and not is_set (script) 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 (script) then								-- when both are specified		if title_table[std][script] then										-- and legitimate			table.insert (tout, title_table[std][script]);						-- 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													-- 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 script set but std not set if title_table['NO_STD'][script] then table.insert (tout, title_table['NO_STD'][script]);					-- use 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, '" class="Unicode" style="white-space:normal; text-decoration:none">');	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 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

if 'yes' == 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

--[[--< 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); local out = {}; local language_name; local code, script, region, variant = get_ietf_parts (args.code); if not (code and script and region and variant) then return make_error_msg (table.concat ({': unknown language code: ', args.code or 'missing'}), args.nocat); end if not is_set (args.italic) then args.italic = 'no';														-- DEFAULT for templates is to not italicize end

local msg = validate_text ('lang', args); if is_set (msg) then return msg; end args.code = format_ietf_tag (code, script, region, 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 >


 * code = the BCP47 language code
 * text = 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
 * lit = text that is a literal translation of text

for those templates that support transliteration:
 * translit = text that is a transliteration of text
 * std = the standard that applies to the transliteration
 * script = ISO 15924 script name; falls back to code

]]

function p.lang_xx (frame) local args = getArgs(frame); if not is_set (args.italic) then args.italic = 'yes';													-- DEFAULT for templates is to italicize end args.size = nil;															-- size not supported in 	local out = {}; local language_name; local code, script, region, variant = get_ietf_parts (args.code);

local translit_script; local translit; local translit_title; if not (code and script and region and variant) then return make_error_msg (table.concat ({': unknown language code: ', args.code or 'missing'}), args.nocat); end local msg = validate_text ('lang-xx', args); if is_set (msg) then return msg; end

args.code = format_ietf_tag (code, script, region, 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.script or language_name;								-- for translit prefer 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.std, args.script) if is_set (translit) then table.insert (out, translit); else return make_error_msg (table.concat ({': invalid translit std: \, args.std or 'missing', '\' or script: \, args.script or 'missing', '\''}), args.nocat); end end if is_set (args.lit) 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.lit); 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;