--[[ ----------------------------------  Lua module implementing the  template.   A merger of the functionality of three templates: ,  and  	 ]]  --[[--------------------------< D E P E N D E N C I E S >------------------------------------------------------ ]]  require('Module:No globals'); local getArgs = require ('Module:Arguments').getArgs;  --[[--------------------------< F O R W A R D   D E C L A R A T I O N S >-------------------------------------- ]]  local categories = {};															-- category names local config = {};																-- global configuration settings local digits = {};																-- for i18n; table that translates local-wiki digits to western digits local err_warn_msgs = {};														-- error and warning messages local excepted_pages = {}; local month_num = {};															-- for i18n; table that translates local-wiki month names to western digits local prefixes = {};															-- service provider tail string prefixes local services = {};															-- archive service provider data from local s_text = {};																-- table of static text strings used to build final rendering local uncategorized_namespaces = {};											-- list of namespaces that we should not categorize local uncategorized_subpages = {};												-- list of subpages that should not be categorized  --[[--------------------------< P A G E   S C O P E   I D E N T I F I E R S >---------------------------------- ]]  local non_western_digits;														-- boolean flag set true when data.digits.enable is true local this_page = mw.title.getCurrentTitle();  local track = {};																-- Associative array to hold tracking categories local ulx = {};																	-- Associative array to hold template data   --[[--------------------------< S U B S T I T U T E >----------------------------------------------------------  Populates numbered arguments in a message string using an argument table.  ]]  local function substitute (msg, args) 	return args and mw.message.newRawMessage (msg, args):plain() or msg; end  --[[--------------------------< tableLength >-----------------------  Given a 1-D table, return number of elements  ]]  local function tableLength(T) 	local count = 0 	for _ in pairs(T) do count = count + 1 end 	return count 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 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, no_link) 	if nil == no_link then 		if link and ( ~= link) then 			if display and ( ~= display) then 				return table.concat ({'', display, ''}); 			else 				return table.concat ({'', link, ''}); 			end 		end 		return display or ;													-- link not set so return the display text  	else																		-- no_link 		if display and ( ~= display) then										-- if there is display text 			return display;														-- return that 		else 			return link or ;													-- return the target article name or empty string 		end 	end end  --[[--------------------------< createTracking >-----------------------  Return data in track[] ie. tracking categories  ]]  local function createTracking() 	if not excepted_pages[this_page.fullText] then								-- namespace:title/fragment is allowed to be categorized (typically this module's / template's testcases page(s)) 		if uncategorized_namespaces[this_page.nsText] then 			return ;															-- this page not to be categorized so return empty string 		end 		for _,v in ipairs (uncategorized_subpages) do							-- cycle through page name patterns 			if this_page.text:match (v) then									-- test page name against each pattern 				return ;														-- this subpage type not to be categorized so return empty string 			end 		end 	end  	local out = {}; 	if tableLength(track) > 0 then 		for key, _ in pairs(track) do											-- loop through table 			table.insert (out, make_wikilink (key));							-- and convert category names to links 		end 	end 	return table.concat (out);													-- concat into one big string; empty string if table is empty  end  --[[--------------------------< inlineError >-----------------------  Critical error. Render output completely in red. Add to tracking category.  This function called as the last thing before abandoning this module  ]]  local function inlineError (msg, args) 	track[categories.error] = 1 	return table.concat ({ 		'Error in ',	-- open the error message span 		config.tname,															-- insert the local language template name 		' template: ', 		substitute (msg, args),													-- insert the formatted error message 		'.',																-- close the span 		createTracking()														-- add the category 		}) end  --[[--------------------------< inlineRed >-----------------------  Render a text fragment in red, such as a warning as part of the final output. Add tracking category.   ]]  local function inlineRed(msg, trackmsg) 	if trackmsg == "warning" then 		track[categories.warning] = 1; 	elseif trackmsg == "error" then 		track[categories.error] = 1; 	end  	return '' .. msg .. '' end  --[[--------------------------< base62 >-----------------------  Convert base-62 to base-10 Credit: https://de.wikipedia.org/wiki/Modul:Expr   ]]  local function base62( value ) 	local r = 1																	-- default return value is input value is malformed  	if value:match ('%W') then													-- value must only be in the set [0-9a-zA-Z] 		return;																	-- nil return when value contains extraneous characters 	end  	local n = #value															-- number of characters in value 	local k = 1 	local c 	r = 0 	for i = n, 1, -1 do															-- loop through all characters in value from ls digit to ms digit 		c = value:byte( i, i ) 		if c >= 48 and c <= 57 then												-- character is digit 0-9 			c = c - 48 		elseif c >= 65 and c <= 90 then											-- character is ascii a-z 			c = c - 55 		else																	-- must be ascii A-Z 			c = c - 61 		end 		r = r + c * k															-- accumulate this base62 character's value 		k = k * 62																-- bump for next 	end -- for i  	return r end   --[[--------------------------< D E C O D E _ D A T E >--------------------------------------------------------  Given a date string, return it in iso format along with an indicator of the date's format.  Except that month names must be recognizable as legitimate month names with proper capitalization, and that the date string must match one of the recognized date formats, no error checking is done here; return nil else  ]]  local function decode_date (date_str) 	local patterns = { 		['dmy'] = {'^(%d%d?) +([^%s%d]+) +(%d%d%d%d)$', 'd', 'm', 'y'},			-- %a does not recognize unicode combining characters used by some languages 		['mdy'] = {'^([^%s%d]+) (%d%d?), +(%d%d%d%d)$', 'm', 'd', 'y'}, 		['ymd'] = {'^(%d%d%d%d) +([^%s%d]+) (%d%d?)$', 'y', 'm', 'd'},			-- not mos compliant at en.wiki but may be acceptible at other wikis 		}; 	 	local t = {};  	if non_western_digits then													-- this wiki uses non-western digits? 		date_str = mw.ustring.gsub (date_str, '%d', digits);					-- convert this wiki's non-western digits to western digits 	end  	if date_str:match ('^%d%d%d%d%-%d%d%-%d%d$') then							-- already an iso format date, return western digits form 		return date_str, 'iso'; 	end 	 	for k, v in pairs (patterns) do 		local c1, c2, c3 = mw.ustring.match (date_str, patterns[k][1]);			-- c1 .. c3 are captured but we don't know what they hold 		 		if c1 then																-- set on match 			t = {																-- translate unspecified captures to y, m, and d 				[patterns[k][2]] = c1,											-- fill the table of captures with the captures 				[patterns[k][3]] = c2,											-- take index names from src_pattern table and assign sequential captures 				[patterns[k][4]] = c3, 				}; 			if month_num[t.m] then												-- when month not already a number 				t.m = month_num[t.m];											-- replace valid month name with a number 			else 				return nil, 'iso';												-- not a valid date form because month not valid 			end  			return mw.ustring.format ('%.4d-%.2d-%.2d', t.y, t.m, t.d), k;		-- return date in iso format 		end 	end 	return nil, 'iso';															-- date could not be decoded; return nil and default iso date end  	 --[[--------------------------< makeDate >-----------------------  Given year, month, day numbers, (zero-padded or not) return a full date in df format where df may be one of: 	mdy, dmy, iso, ymd  on entry, year, month, day are presumed to be correct for the date that they represent; all are required  in this module, makeDate() is sometimes given an iso-format date in year: 	makeDate (2018-09-20, nil, nil, df) this works because table.concat() sees only one table member  ]]  local function makeDate (year, month, day, df) 	local format = { 		['dmy'] = 'j F Y', 		['mdy'] = 'F j, Y', 		['ymd'] = 'Y F j', 		['iso'] = 'Y-m-d', 		};  	local date = table.concat ({year, month, day}, '-');						-- assemble year-initial numeric-format date (zero padding not required here)  	if non_western_digits then													--this wiki uses non-western digits? 		date = mw.ustring.gsub (date, '%d', digits);							-- convert this wiki's non-western digits to western digits 	end  	return mw.getContentLanguage():formatDate (format[df], date); end  --[[--------------------------< I S _ V A L I D _ D A T E >----------------------------------------------------  Returns true if date is after 31 December 1899 (why is 1900 the min year? shouldn't the internet's date-of-birth be min year?), not after today's date, and represents a valid date (29 February 2017 is not a valid date).  Applies Gregorian leapyear rules.  all arguments are required  ]]  local function is_valid_date (year, month, day) 	local days_in_month = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; 	local month_length; 	local y, m, d; 	local today = os.date ('*t');												-- fetch a table of current date parts  	if not year or  == year or not month or  == month or not day or  == day then 		return false;															-- something missing 	end 	 	y = tonumber (year); 	m = tonumber (month); 	d = tonumber (day);  	if 1900 > y or today.year < y or 1 > m or 12 < m then						-- year and month are within bounds	TODO: 1900? 		return false; 	end  	if (2==m) then																-- if February 		month_length = 28;														-- then 28 days unless 		if (0==(y%4) and (0~=(y%100) or 0==(y%400))) then						-- is a leap year? 			month_length = 29;													-- if leap year then 29 days in February 		end 	else 		month_length=days_in_month[m]; 	end  	if 1 > d or month_length < d then											-- day is within bounds 		return false; 	end 																					-- here when date parts represent a valid date 	return os.time({['year']=y, ['month']=m, ['day']=d, ['hour']=0}) <= os.time();	-- date at midnight must be less than or equal to current date/time end  --[[--------------------------< decodeWebciteDate >-----------------------  Given a URI-path to Webcite (eg. /67xHmVFWP) return the encoded date in df format  returns date string in df format - webcite date is a unix timestamp encoded as bae62 or the string 'query'  ]]  local function decodeWebciteDate(path, df)  	local dt = {}; 	local decode;  	dt = mw.text.split(path, "/")  	-- valid URL formats that are not base62  	-- http://www.webcitation.org/query?id=1138911916587475 	-- http://www.webcitation.org/query?url=http..&date=2012-06-01+21:40:03 	-- http://www.webcitation.org/1138911916587475 	-- http://www.webcitation.org/cache/73e53dd1f16cf8c5da298418d2a6e452870cf50e 	-- http://www.webcitation.org/getfile.php?fileid=1c46e791d68e89e12d0c2532cc3cf629b8bc8c8e  	if dt[2]:find ('query', 1, true) or  		dt[2]:find ('cache', 1, true) or 		dt[2]:find ('getfile', 1, true) or 		tonumber(dt[2]) then 			return 'query'; 	end  	decode = base62(dt[2]);														-- base62 string -> exponential number 	if not decode then 		return nil;																-- nil return when dt[2] contains characters not in %w 	end 	dt = os.date('*t', string.format("%d", decode):sub(1,10))					-- exponential number -> text -> first 10 characters (a unix timestamp) -> a table of date parts  	decode = makeDate (dt.year, dt.month, dt.day, 'iso');						-- date comparisons are all done in iso format with western digits 	if non_western_digits then													--this wiki uses non-western digits? 		decode = mw.ustring.gsub (decode, '%d', digits);						-- convert this wiki's non-western digits to western digits 	end  	return decode; end  --[[--------------------------< decodeWaybackDate >-----------------------  Given a URI-path to Wayback (eg. /web/20160901010101/http://example.com ) or Library of Congress Web Archives (/all/20160901010101/http://example.com) return the formatted date eg. "September 1, 2016" in df format  Handle non-digits in snapshot ID such as "re_" and "-" and "*"  returns two values: 	first value is one of these: 		valid date string in df format - wayback date is valid (including the text string 'index' when date is '/*/') 		empty string - wayback date is malformed (less than 8 digits, not a valid date) 		nil - wayback date is '/save/' or otherwise not a number 	 	second return value is an appropriate 'message' may or may not be formatted  ]]  local function decodeWaybackDate(path, df)  	local msg, snapdate;  	snapdate = path:gsub ('^/all/', ):gsub ('^/web/', ):gsub ('^/', );	-- remove leading '/all/', leading '/web/' or leading '/' 	snapdate = snapdate:match ('^[^/]+');										-- get timestamp 	if snapdate == "*" then														-- eg. /web/*/http.. or /all/*/http.. 		return 'index';															-- return indicator that this url has an index date 	end  	snapdate = snapdate:gsub ('%a%a_%d?$', ):gsub ('%-', );					-- from date, remove any trailing "re_", dashes  	msg = ; 	if snapdate:match ('%*$') then												-- a trailing '*' causes calendar display at archive .org 		snapdate = snapdate:gsub ('%*$', );									-- remove so not part of length calc later 		msg = inlineRed (err_warn_msgs.ts_cal, 'warning');						-- make a message 	end  	if not tonumber(snapdate) then 		return nil, 'ts_nan';													-- return nil (fatal error flag) and message selector 	end  	local dlen = snapdate:len(); 	if dlen < 8 then															-- we need 8 digits TODO: but shouldn't this be testing for 14 digits? 		return , inlineRed (err_warn_msgs.ts_short, 'error');					-- return empty string and error message 	end  	local year, month, day = snapdate:match ('(%d%d%d%d)(%d%d)(%d%d)');			-- no need for snapdatelong here  	if not is_valid_date (year, month, day) then 		return , inlineRed (err_warn_msgs.ts_date, 'error');					-- return empty string and error message 	end  	snapdate = table.concat ({year, month, day}, '-');							-- date comparisons are all done in iso format 	if 14 == dlen then 		return snapdate, msg;													-- return date with message if any 	else 		return snapdate, msg .. inlineRed (err_warn_msgs.ts_len, 'warning');	-- return date with warning message(s) 	end end  --[[--------------------------< decodeArchiveisDate >-----------------------  Given an Archive.is "long link" URI-path (e.g. /2016.08.28-144552/http://example.com) return the date in df format (e.g. if df = dmy, return 28 August 2016) Handles "." and "-" in snapshot date, so 2016.08.28-144552 is same as 20160828144552  returns two values: 	first value is one of these: 		valid date string in df format - archive.is date is valid (including the text string 'short link' when url is the short form) 		empty string - wayback date is malformed (not a number, less than 8 digits, not a valid date) 		nil - wayback date is '/save/' 	 	second return value is an appropriate 'message' may or may not be formatted  ]]  local function decodeArchiveisDate(path, df) 	local snapdate  	if path:match ('^/%w+$') then												-- short form url path is '/' followed by some number of base 62 digits and nothing else 		return "short link"														-- e.g. http://archive.is/hD1qz 	end  	snapdate = mw.text.split (path, '/')[2]:gsub('[%.%-]', );					-- get snapshot date, e.g. 2016.08.28-144552; remove periods and hyphens  	local dlen = string.len(snapdate) 	if dlen < 8 then															-- we need 8 digits TODO: but shouldn't this be testing for 14 digits? 		return , inlineRed (err_warn_msgs.ts_short, 'error');					-- return empty string and error message 	end  	local year, month, day = snapdate:match ('(%d%d%d%d)(%d%d)(%d%d)');			-- no need for snapdatelong here  	if not is_valid_date (year, month, day) then 		return , inlineRed (err_warn_msgs.ts_date, 'error');					-- return empty string and error message 	end  	snapdate = table.concat ({year, month, day}, '-');							-- date comparisons are all done in iso format 	if 14 == dlen then 		return snapdate;														-- return date 	else 		return snapdate, inlineRed (err_warn_msgs.ts_len, 'warning');			-- return date with warning message 	end  end  --[[--------------------------< serviceName >-----------------------  Given a domain extracted by mw.uri.new() (eg. web.archive.org) set tail string and service ID  ]]  local function serviceName(host, no_link) 	local tracking; 	local index; 	 	host = host:lower():gsub ('^web%.(.+)', '%1'):gsub ('^www%.(.+)', '%1');	-- lowercase, remove web. and www. subdomains  	if services[host] then 		index = host; 	else 		for k, _ in pairs (services) do 			if host:find ('%f[%a]'..k:gsub ('([%.%-])', '%%%1')) then 				index = k; 				break; 			end 		end 	end 	 	if index then 		local out = {};														-- empty string in [1] so that concatenated result has leading single space 		ulx.url1.service = services[index][4] or 'other'; 		tracking = services[index][5] or categories.other; 																				-- build tail string 		if false == services[index][1] then										-- select prefix 			table.insert (out, prefixes.at); 		elseif true == services[index][1] then 			table.insert (out, prefixes.atthe); 		else 			table.insert (out, services[index][1]); 		end 		 		table.insert (out, make_wikilink (services[index][2], services[index][3], no_link));	-- add article wikilink 		if services[index][6] then												-- add tail postfix if it exists 			table.insert (out, services[index][6]); 		end 		 		ulx.url1.tail = table.concat (out, ' ');								-- put it all together; result has leading space character  	else																		-- here when unknown archive 		ulx.url1.service = 'other'; 		tracking = categories.unknown; 		ulx.url1.tail = table.concat ({, host, prefixes.at, inlineRed (err_warn_msgs.unknown_url, error)}, ' '); 	end 	 	track[tracking] = 1 end  --[[--------------------------< parseExtraArgs >-----------------------  Parse numbered arguments starting at 2, such as url2..url10, date2..date10, title2..title10 	For example:  		Three url arguments not in numeric sequence (1..4..7).  			Function only processes arguments numbered 2 or greater (in this case 4 and 7) 				It creates numeric sequenced table entries like: 				urlx.url2.url = <argument value for url4> 				urlx.url3.url = <argument value for url7> 			Returns the number of URL arguments found numbered 2 or greater (in this case returns "2")   ]]  local function parseExtraArgs(args)  	local i, j, argurl, argurl2, argdate, argtitle  	j = 2 	for i = 2, config.maxurls do 		argurl = "url" .. i 		if args[argurl] then 			argurl2 = "url" .. j 			ulx[argurl2] = {} 			ulx[argurl2]["url"] = args[argurl] 			argdate = "date" .. j 			if args[argdate] then 				ulx[argurl2]["date"] = args[argdate] 			else 				ulx[argurl2]["date"] = inlineRed (err_warn_msgs.date_miss, 'warning'); 			end 	 			argtitle = "title" .. j 			if args[argtitle] then 				ulx[argurl2]["title"] = args[argtitle] 			else 				ulx[argurl2]["title"] = nil 			end 			j = j + 1 		end 	end  	if j == 2 then 		return 0 	else 		return j - 2 	end end  --[[--------------------------< comma >-----------------------  Given a date string, return "," if it's MDY   ]]  local function comma(date) 	return (date and date:match ('%a+ +%d%d?(,) +%d%d%d%d')) or ; end  --[[--------------------------< createRendering >-----------------------  Return a rendering of the data in ulx[][]  ]]  local function createRendering()  	local displayfield 	local out = {}; 	 	local index_date, msg = ulx.url1.date:match ('(index)(.*)');				-- when ulx.url1.date extract 'index' text and message text (if there is a message) 	ulx.url1.date = ulx.url1.date:gsub ('index.*', 'index');					-- remove message  	if 'none' == ulx.url1.format then											-- For ,  		table.insert (out, ulx.url1.tail);									-- tail text 		table.insert (out, ' [');												-- open extlink markup 		table.insert (out, ulx.url1.url);										-- add url  		if ulx.url1.title then 			table.insert (out, ' ')												-- the required space 			table.insert (out, ulx.url1.title)									-- the title 			table.insert (out, ']');											-- close extlink markup 			if ulx.url1.date then 				table.insert (out, ' (');									-- open date text; TODO: why the html entity? replace with regular space? 				table.insert (out, ulx.url1.date .. ' তারিখে');								-- add date 				table.insert (out, ' ');										-- insert a space 				table.insert (out, 'index' == ulx.url1.date and s_text.archive or s_text.archived);	-- add text 				table.insert (out, ')');										-- close date text 			end 		else																	-- no title 			if index_date then													-- when url date is 'index'  				table.insert (out, table.concat ({' ', s_text.Archive_index, ']'}));	-- add the index link label 				table.insert (out, msg or );									-- add date mismatch message when url date is /*/ and |date= has valid date 			else 				table.insert (out, table.concat ({' ', s_text.Archived, '] '}));	-- add link label for url has timestamp date (will include mismatch message if there is one) 			end 			if ulx.url1.date then 				if 'index' ~= ulx.url1.date then 					table.insert (out, ulx.url1.date .. ' তারিখম');							-- add date when data is not 'index' 				end 				table.insert (out, comma(ulx.url1.date));						-- add ',' if date format is mdy 			else																-- no date 				table.insert (out, ulx.url1.tail);								-- add tail text 			end 		end  		if 0 < ulx.url1.extraurls then											-- For multiple archive URLs 			local tot = ulx.url1.extraurls + 1 			table.insert (out, '।')												-- terminate first url 			table.insert (out, table.concat ({' ', s_text.addlarchives, ': '}));	-- add header text  			for i=2, tot do														-- loop through the additionals 				local index = table.concat ({'url', i});						-- make an index 				displayfield = ulx[index]['title'] and 'title' or 'date';		-- choose display text 				table.insert (out, '[');										-- open extlink markup 				table.insert (out, ulx[index]['url']);							-- add the url 				table.insert (out, ' ');										-- the required space 				table.insert (out, ulx[index][displayfield]);					-- add the label 				table.insert (out, ']');										-- close extlink markup 				table.insert (out, i==tot and '।' or ', ');						-- add terminator 			end 		end 		return table.concat (out);												-- make a big string and done  	else																		-- For 																	 		if 'addlarchives' == ulx.url1.format then								-- Multiple archive services  			table.insert (out, table.concat ({s_text.addlarchives, ': '}));		-- add header text 		else																	-- Multiple pages from the same archive  			table.insert (out, table.concat ({s_text.addlpages, ' '}));			-- add header text 			table.insert (out, ulx.url1.date);									-- add date to header text 			table.insert (out, ': ');											-- close header text 		end  		local tot = ulx.url1.extraurls + 1; 		for i=1, tot do															-- loop through the additionals 			local index = table.concat ({'url', i});							-- make an index 			table.insert (out, '[');											-- open extlink markup 			table.insert (out, ulx[index]['url']);								-- add url 			table.insert (out, ' ');											-- add required space  			displayfield = ulx[index]['title']; 			if 'addlarchives' == ulx.url1.format then 				if not displayfield then  					displayfield = ulx[index]['date'] 				end 			else																-- must be addlpages 				if not displayfield then  					displayfield = table.concat ({s_text.Page, ' ', i}); 				end 			end 			table.insert (out, displayfield);									-- add title, date, page label text 			table.insert (out, ']');											-- close extlink markup 			table.insert (out, (i==tot and '।' or ', '));							-- add terminator 		end 		return table.concat (out);												-- make a big string and done 	end end  --[[--------------------------< P A R A M E T E R _ N A M E _ X L A T E >--------------------------------------  for internaltionalization, translate local-language parameter names to their English equivalents  TODO: return error message if multiple aliases of the same canonical parameter name are found?  returns two tables: 	new_args - holds canonical form parameters and their values either from translation or because the parameter was already in canonical form 	origin - maps canonical-form parameter names to their untranslated (local language) form for error messaging in the local language  unrecognized parameters are ignored  ]]  local function parameter_name_xlate (args, params, enum_params) 	local name;																	-- holds modifiable name of the parameter name during evaluation 	local enum;																	-- for enumerated parameters, holds the enumerator during evaluation 	local found = false;														-- flag used to break out of nested for loops 	local new_args = {};														-- a table that holds canonical and translated parameter k/v pairs 	local origin = {};															-- a table that maps original (local language) parameter names to their canonical name for local language error messaging 	local unnamed_params;														-- set true when unsupported positional parameters are detected 	 	for k, v in pairs (args) do													-- loop through all of the arguments in the args table 		name = k;																-- copy of original parameter name  		if 'string' == type (k) then 			if non_western_digits then											-- true when non-western digits supported at this wiki 				name = mw.ustring.gsub (name, '%d', digits);					-- convert this wiki's non-western digits to western digits 			end 			 			enum = name:match ('%d+$');											-- get parameter enumerator if it exists; nil else 			 			if not enum then													-- no enumerator so looking for non-enumnerated parameters 				-- TODO: insert shortcut here? if params[name] then name holds the canonical parameter name; no need to search further 				for pname, aliases in pairs (params) do							-- loop through each parameter the params table 					for _, alias in ipairs (aliases) do							-- loop through each alias in the parameter's aliases table 						if name == alias then 							new_args[pname] = v;								-- create a new entry in the new_args table 							origin [pname] = k;									-- create an entry to make canonical parameter name to original local language parameter name 							found = true;										-- flag so that we can break out of these nested for loops 							break;												-- no need to search the rest of the aliases table for name so go on to the next k, v pair 						end 					end 	 					if found then												-- true when we found an alias that matched name 						found = false;											-- reset the flag 						break;													-- go do next args k/v pair 					end 				end 			else																-- enumerated parameters 				name = name:gsub ('%d$', '#');									-- replace enumeration digits with place holder for table search 				-- TODO: insert shortcut here? if num_params[name] then name holds the canonical parameter name; no need to search further 				for pname, aliases in pairs (enum_params) do					-- loop through each parameter the num_params table 					for _, alias in ipairs (aliases) do							-- loop through each alias in the parameter's aliases table 						if name == alias then 							pname = pname:gsub ('#$', enum);					-- replace the '#' place holder with the actual enumerator 							new_args[pname] = v;								-- create a new entry in the new_args table 							origin [pname] = k;									-- create an entry to make canonical parameter name to original local language parameter name 							found = true;										-- flag so that we can break out of these nested for loops 							break;												-- no need to search the rest of the aliases table for name so go on to the next k, v pair 						end 					end 	 					if found then												-- true when we found an alias that matched name 						found = false;											-- reset the flag 						break;													-- go do next args k/v pair 					end 				end 			end 		else 			unnamed_params = true;												-- flag for unsupported positional parameters 		end 	end																			-- for k, v 	return new_args, origin, unnamed_params; end  --[[--------------------------< W E B A R C H I V E >----------------------------------------------------------  template entry point  ]]  local function webarchive(frame) 	local args = getArgs (frame);  	local data = mw.loadData (table.concat ({									-- make a data module name; sandbox or live 		'মডিউল:ওয়েব আর্কাইভ/উপাত্ত', 		frame:getTitle():find('খেলাঘর', 1, true) and '/খেলাঘর' or 			-- this instance is ./sandbox then append /sandbox 		})); 	categories = data.categories;												-- fill in the forward declarations 	config = data.config; 	if data.digits.enable then 		digits = data.digits;													-- for i18n; table of digits in the local wiki's language 		non_western_digits = true;												-- use_non_western_digits 	end 	err_warn_msgs = data.err_warn_msgs; 	excepted_pages = data.excepted_pages; 	month_num = data.month_num;													-- for i18n; table of month names in the local wiki's language 	prefixes = data.prefixes; 	services = data.services; 	s_text = data.s_text; 	uncategorized_namespaces = data.uncategorized_namespaces; 	uncategorized_subpages = data.uncategorized_subpages;  	local origin = {};															-- holds a map of English to local language parameter names used in the current template; not currently used 	local unnamed_params;														-- boolean set to true when template call has unnamed parameters 	args, origin, unnamed_params = parameter_name_xlate (args, data.params, data.enum_params);	-- translate parameter names in args to English  	local date, format, msg, udate, uri, url; 	local ldf = 'iso';															-- when there is no |date= parameter, render url dates in iso format 	 	if args.url and args.url1 then												-- URL argument (first) 		return inlineError (data.crit_err_msgs.conflicting, {origin.url, origin.url1}); 	end 	 	url = args.url or args.url1; 	 	if not url then 		return inlineError (data.crit_err_msgs.empty); 	end 																				-- these iabot bugs perportedly fixed; removing these causes lua script error --[[																				-- at Template:Webarchive/testcases/Production; resolve that before deleting these tests 	if mw.ustring.find( url, "https://web.http", 1, true ) then					-- track bug - TODO: IAbot bug; not known if the bug has been fixed; deferred 		track[categories.error] = 1; 		return inlineError (data.crit_err_msgs.iabot1); 	end  	if url == "https://web.archive.org/http:/" then								 -- track bug - TODO: IAbot bug; not known if the bug has been fixed; deferred 		track[categories.error] = 1; 		return inlineError (data.crit_err_msgs.iabot2); 	end ]]  	if not (url:lower():find ('^http') or url:find ('^//')) then 		return inlineError (data.crit_err_msgs.invalid_url ); 	end  	ulx.url1 = {} 	ulx.url1.url = url  	ulx.url1.extraurls = parseExtraArgs(args)  	local good = false; 	good, uri = pcall (mw.uri.new, ulx.url1.url);								-- get a table of uri parts from this url; protected mode to prevent lua error when ulx.url1.url is malformed 	 	if not good or nil == uri.host then											-- abandon when ulx.url1.url is malformed 		return inlineError (data.crit_err_msgs.invalid_url); 	end 	 	serviceName(uri.host, args.nolink)  	if args.date and args.date1 then											-- Date argument 		return inlineError (data.crit_err_msgs.conflicting, {origin.date, origin.date1}); 	end 	 	date = args.date or args.date1; 	date = date and date:gsub (' +', ' ');										-- replace multiple spaces with a single space  	if date and config.verifydates then 		if '*' == date then 			date = 'index'; 			ldf = 'iso';														-- set to default format 		else 			date, ldf = decode_date (date);										-- get an iso format date from date and get date's original format 		end 	end  	if 'wayback' == ulx.url1.service or 'locwebarchives' == ulx.url1.service then 		if date then 			if config.verifydates then 				if ldf then 					udate, msg = decodeWaybackDate (uri.path);					-- get the url date in iso format and format of date in |date=; 'index' when wayback url date is * 					if not udate then											-- this is the only 'fatal' error return 						return inlineError (data.crit_err_msgs[msg]); 					end  					if udate ~= date then										-- date comparison using iso format dates 						date = udate; 						msg = table.concat ({ 							inlineRed (err_warn_msgs.mismatch, 'warning'),		-- add warning message 							msg,												-- add message if there is one 						}); 					end 				end 			end 		else																	-- no |date= 			udate, msg = decodeWaybackDate (uri.path);  			if not udate then													-- this is the only 'fatal' error return 				return inlineError (data.crit_err_msgs[msg]); 			end  			if  == udate then  				date = nil;														-- unset 			else 				date = udate; 			end 		end  	elseif 'webcite' == ulx.url1.service then 		if date then 			if config.verifydates then 				if ldf then 					udate = decodeWebciteDate (uri.path);						-- get the url date in iso format 					if 'query' ~= udate then									-- skip if query 						if udate ~= date then									-- date comparison using iso format dates 							date = udate; 							msg = table.concat ({ 								inlineRed (err_warn_msgs.mismatch, 'warning'), 								}); 						end 					end 				end 			end 		else 			date = decodeWebciteDate( uri.path, "iso" ) 			if date == "query" then 				date = nil;														-- unset 				msg = inlineRed (err_warn_msgs.date_miss, 'warning'); 			elseif not date then												-- invalid base62 string 				date = inlineRed (err_warn_msgs.date1, 'error'); 			end 		end  	elseif 'archiveis' == ulx.url1.service then 		if date then 			if config.verifydates then 				if ldf then 					udate, msg = decodeArchiveisDate (uri.path)					-- get the url date in iso format 					if 'short link' ~= udate then								-- skip if short link 						if udate ~= date then									-- date comparison using iso format dates 							date = udate; 							msg = table.concat ({ 								inlineRed (err_warn_msgs.mismatch, 'warning'),	-- add warning message 								msg,											-- add message if there is one 							}); 						end 					end 				end 			end 		else																	-- no |date= 			udate, msg = decodeArchiveisDate( uri.path, "iso" ) 			if udate == "short link" then 				date = nil;														-- unset 				msg = inlineRed (err_warn_msgs.date_miss, 'warning'); 			elseif  == udate then 				date = nil;														-- unset 			else 				date = udate; 			end 		end 		 	else																		-- some other service 		if not date then 			msg = inlineRed (err_warn_msgs.date_miss, 'warning'); 		end 	end  	if 'index' == date then 		ulx.url1.date = date .. (msg or );									-- create index + message (if there is one) 	elseif date then 		ulx.url1.date = makeDate (date, nil, nil, ldf) .. (msg or );			-- create a date in the wiki's local language + message (if there is one) 	else 		ulx.url1.date = msg; 	end 		 	format = args.format;														-- Format argument   	if not format then 		format = "none" 	else 		for k, v in pairs (data.format_vals) do									-- |format= accepts two specific values loop through a table of those values 			local found;														-- declare a nil flag 			for _, p in ipairs (v) do											-- loop through local language variants 				if format == p then												-- when |format= value matches  					format = k;													-- use name from table key 					found = true;												-- declare found so that we can break out of outer for loop 					break;														-- break out of inner for loop 				end 			end 			 			if found then 				break; 			end 		end  		if format == "addlpages" then 			if not ulx.url1.date then 				format = "none" 			end 		elseif format == "addlarchives" then 			format = "addlarchives" 		else 			format = "none" 		end 	end 	ulx.url1.format = format  	if args.title and args.title1 then											-- Title argument 		return inlineError (data.crit_err_msgs.conflicting, {origin.title, origin.title1}); 	end  	ulx.url1.title = args.title or args.title1;  	local rend = createRendering() 	if not rend then 		return inlineError (data.crit_err_msgs.unknown); 	end  	return rend .. ((unnamed_params and inlineRed (err_warn_msgs.unnamed_params, 'warning')) or ) .. createTracking();  end  --[[--------------------------< E X P O R T E D 	 F U N C T I O N S >------------------------------------------ ]]  return {webarchive = webarchive};