Module:Currency

require('strict')

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 ($00) end amount = amount:gsub (',', '%.');										-- replace grouping character with period return amount; end return amount .. ' US$ – definition missing position (help) ';	-- 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 ' US$ – definition missing page (help) '; 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 ('Module:Currency/Presentation');				-- 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 ' US$ – invalid code (help) '; 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 ' US$ – invalid format (help) '; 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  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 ' US$ – invalid amount (help) '; 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 ' US$ – invalid amount (help) '; --	end

-- This allows us to use US$ 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 ' US$ – invalid amount (help) '; 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 }