require('Module:No globals')  local p = {} local lang = mw.language.getContentLanguage();									-- language object for this wiki local presentation ={};															-- table of tables that contain currency presentation data local properties;  --[[--------------------------< I S _ S E T >------------------------------------------------------------------  Whether variable is set or not.  A variable is set when it is not nil and not empty.  ]]  local function is_set( var ) 	return not (var == nil or var == ); end  --[[--------------------------< M A K E _ S H O R T _ F O R M  _ N A M E >-------------------------------------  Assembles value and symbol according to the order specified in the properties table for this currency code  ]]  local function make_short_form_name (amount, code, linked, passthrough) 	local symbol; 	local position = properties[code].position;  	if linked then 		symbol = string.format ('%s', properties[code].page, properties[code].symbol);	-- make wikilink of page and symbol 	else 		symbol = properties[code].symbol; 	end  	if not passthrough then 		amount = lang:formatNum (tonumber(amount));								-- add appropriate comma separators 	end 	 	amount = amount:gsub ('^%-', '−');											-- replace the hyphen with unicode minus  	if 'b' == position then														-- choose appropriate format: unspaced before the amount 		return string.format ('%s%s', symbol, amount); 	elseif 'bs' == position then												-- spaced before the amount 		return string.format ('%s %s', symbol, amount); 	elseif 'a' == position then													-- unspaced after the amount 		return string.format ('%s%s', amount, symbol); 	elseif 'as' == position then												-- spaced after the amount 		return string.format ('%s %s', amount, symbol); 	elseif 'd' == position then													-- special case that replaces the decimal separator with symbol (Cifrão for CVE is the only extant case) 		if passthrough then 			return string.format('%s%s', symbol, amount) 		end 		 		local digits, decimals;													-- this code may not work for other currencies or on other language wikis 		if amount:match ('[%d,]+%.%d+') then									-- with decimal separator and decimals 			digits, decimals = amount:match ('([%d,]+)%.(%d+)') 			amount = string.format ('%s%s%s', digits, symbol, decimals);		-- insert symbol 		elseif amount:match ('[%d,]+%.?$') then									-- with or without decimal separator 			digits = amount:match ('([%d,]+)%.?$') 			amount = string.format ('%s%s00', digits, symbol);					-- add symbol and 00 ($00) 		end 		amount = amount:gsub (',', '%.');										-- replace grouping character with period 		return amount; 	end 	return amount .. '  – সংজ্ঞায় অবস্থান অনুপস্থিত (সাহায্য)';	-- position not defined end  --[[--------------------------< M A K E _ N A M E >----------------------------------------------------------  Make a wikilink from the currency's article title and its plural (if provided).  If linked is false, returns only the article title (unlinked)  ]]  local function make_name (linked, page, plural) 	if not linked then 		if not is_set (plural) then 			return page;														-- just the page 		elseif 's' == plural then												-- if the simple plural form 			return string.format ('%ss', page);									-- append an 's' 		else 			return plural;														-- must be the complex plural form (pounds sterling v. dollars) 		end 	else 		if not is_set (plural) then 			return string.format ('%s', page); 		elseif 's' == plural then												-- if the simple plural form 			return string.format ('%ss', page); 		else 			return string.format ('%s', page, plural);					-- must be the complex plural form (pounds sterling v. dollars) 		end 	end end  --[[--------------------------< M A K E _ L O N G _ F O R M  _ N A M E >---------------------------------------  assembles a long-form currency name from amount and name from the properties tables; plural for all values not equal to 1  ]]  local function make_long_form_name (amount, code, linked, passthrough) 	local name, formatted; 	 	if not is_set (properties[code].page) then 		return ' – সংজ্ঞায় পাতা অনুপস্থিত (সাহায্য)'; 	end  	if not passthrough then 		amount = tonumber (amount);												-- make sure it's a number 	end  	if 1 == amount then 		name = make_name (linked, properties[code].page);						-- the singular form 	elseif is_set (properties[code].plural) then								-- plural and there is a plural form 		name = make_name (linked, properties[code].page, properties[code].plural); 	else 		name = make_name (linked, properties[code].page);						-- plural but no separate plural form so use the singular form 	end 	 	if not passthrough then 		formatted = lang:formatNum (amount) 	else  		formatted = amount 	end  	return string.format ('%s %s', formatted, name);							-- put it all together end  --[[--------------------------< R E N D E R _ C U R R E N C Y >------------------------------------------------  Renders currency amount with symbol or long-form name.  Also, entry point for other modules.  Assumes that parameters have been vetted; amount is a number, code is upper case string, long_form is boolean; all are required.  ]]  local function render_currency (amount, code, long_form, linked, fmt, passthrough) 	local name; 	local result;  	presentation = mw.loadData ('মডিউল:মুদ্রা/উপস্থাপন');				-- get presentation data  	if presentation.currency_properties[code] then								-- if code is an iso 4217 code 		properties = presentation.currency_properties; 	elseif presentation.code_translation[code] then								-- not iso 4217 but can be translated 		code = presentation.code_translation[code];								-- then translate 		properties = presentation.currency_properties; 	elseif presentation.non_standard_properties[code] then						-- last chance, is it a non-standard code? 		properties = presentation.non_standard_properties; 	else 		return ' – কোড অবৈধ (সাহায্য)'; 	end  	if long_form then 		result = make_long_form_name (amount, code, linked, passthrough);								--  	else 		result = make_short_form_name (amount, code, linked, passthrough); 	end 	 	if 'none' == fmt then														-- no group separation 		result = result:gsub ('(%d%d?%d?),', '%1');								-- strip comma separators 	elseif 'gaps' == fmt then													-- use narrow gaps 		result = result:gsub ('(%d%d?%d?),', '%1');	-- replace comma seperators 	elseif fmt and 'commas' ~= fmt then											-- if not commas (the default) then error message 		return ' – বিন্যাস অবৈধ (সাহায্য)'; 	end  	return result;																-- done end  --[[--------------------------< P A R S E _ F O R M A T T E D _ N U M B E R >----------------------------------  replacement for lang:parseFormattedNumber() which doesn't work; all it does is strip commas.  This function returns a string where all comma separators have been removed from the source string.  If the source is malformed: has characters other than digits, commas, and decimal points; has too many decimal points; has commas in in appropriate locations; then the function returns nil.  ]]  local function parse_formatted_number (amount) 	local count; 	local parts = {}; 	local digits = {}; 	local decimals; 	local sign = ; 	local _; 	 	if amount:find ('[^%-−%d%.,]')	then										-- anything but sign, digits, decimal points, or commas 		return nil; 	end 	 	amount = amount:gsub ('−', '-');											-- replace unicode minus with hyphen 	 	_, count = amount:gsub('%.', )											-- count the number of decimal point characters  	if 1 < count then 		return nil;																-- too many dots 	end  	_, count = amount:gsub(',', )												-- count the number of grouping characters  	if 0 == count then 		return amount;															-- no comma separators so we're done 	end; 	 	if amount:match ('[%-][%d%.,]+') then										-- if the amount is negative 		sign, amount = amount:match ('([%-])([%d%.,]+)');						-- strip off and save the sign 	end  	parts = mw.text.split (amount, '.', true);									-- split amount into digits and decimals 	decimals = table.remove (parts, 2) or ;									-- if there was a decimal portion, remove from the table and save it  	digits = mw.text.split (parts[1], ',')										-- split amount into groups  	for i, v in ipairs (digits) do												-- loop through the groups 		if 1 == i then															-- left-most digit group 			if (3 < v:len() or not is_set (v)) then								-- first digit group: 1, 2, 3 digits; can't be empty string (first char was a comma) 				return nil; 			end 		else 			if v and 3 ~= v:len() then											-- all other groups must be three digits long 				return nil;	 			end 		end 	end  	return sign .. table.concat (digits) .. '.' .. decimals;					-- reassemble without commas and return end  --[[--------------------------< C O N V E R T _ S T R I N G _ T O _  N U M E R I C >------------------------------------------------  Converts quantified number/string combinations to a number e.g. 1 thousand to 1000.  ]]  local function convert_string_to_numeric (amount) 	local quantifiers = {['thousand'] = 1000, ['million'] = 1000000, ['m'] = 1000000, ['billion'] = 1000000000, ['b'] = 1000000000, ['trillion'] = 1000000000000};  	 	local n, q = amount:match ('([%-−]?[%d%.,]+)%s*(%a+)$');					-- see if there is a quantifier following a number; zero or more space characters 	if nil == n then 		n, q = amount:match ('([%-−]?[%d%.,]+) (%a+)$')					-- see if there is a quantifier following a number; nbsp html entity ( output 	end 	if nil == n then return amount end;											-- if not <number><space><quantifier> return amount unmolested 	 	n = n:gsub (',', );														-- strip comma separators if present 	q = q:lower();																-- set the quantifier to lower case  	if nil == quantifiers[q] then return amount end;							-- if not a recognized quantifier 	 	return tostring (n * quantifiers[q]);										-- return a string, not a number end  --[[--------------------------< C U R R E N C Y >--------------------------------------------------------------  Template:Currency entry point.  The template takes three parameters: 	positional (1st), |amount=, |Amount=	: digits and decimal points only 	positional (2nd), |type=, |Type=		: code that identifies the currency 	|first=									: uses currency name instead of symbol  ]]  local function currency (frame) 	local args = require('Module:Arguments').getArgs (frame);  	local amount, code; 	local long_form = false; 	local linked = true; 	local passthrough = false;  	if not is_set (args[1]) then 		return ' – অবৈধ পরিমাণ (সাহায্য)'; 	end 	 --	amount = lang:parseFormattedNumber(args[1]);								-- if args[1] can't be converted to a number then error (this just strips grouping characters) --	if args[1]:find ('[^%d%.]') or not amount then								-- non-digit characters or more than one decimal point (because lag:parse... is broken) --		return ' – অবৈধ পরিমাণ (সাহায্য)'; --	end  	-- This allows us to use  while actually following MOS:CURRENCY as regards "billion", "million", "M", "bn", etc. 	if not (args['passthrough'] == 'yes') then -- just pass whatever string is given through. 		amount = convert_string_to_numeric (args[1]); 		amount = parse_formatted_number(amount);								-- if args[1] can't be converted to a number then error 		if not amount then 			return ' – অবৈধ পরিমাণ (সাহায্য)'; 		end 	else 		amount = args[1] 	end 	 	if not is_set(args[2]) then													-- if not provided 		code = 'USD';															-- default to USD 	else 		code = args[2]:upper();													-- always upper case; used as index into data tables which all use upper case 	end 	 	if args[3] then																-- this is the |first= parameter  TODO: make this value meaningful? y, yes, true? 		long_form = true; 	end 	 	if 'no' == args[4] then														-- this is the |linked= parameter; defaults to 'yes'; any value but 'no' means yes 		linked = false; 	end  	return render_currency (amount, code, long_form, linked, args['fmt'], (args['passthrough'] == 'yes')) end  return { 	currency = currency,														-- template entry point 	_render_currency = render_currency,											-- other modules entry point 	}