Permanently protected module


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This module is used by {{val}}.

Use in other modules


The gaps function can be useful for formatting in other modules that work with displaying large numbers.

local gaps = require('Module:Gapnum').gaps

Using the gaps function, the first argument is the number to format. The second argument can be a table with keys that tell the module how to format. The table keys that can be used are:

  • gap - a number with CSS units (px, em, en, etc) that define the size of the gap between numbers. If blank, the module will use 0.25em.
  • prec - a number that determines the precision of the decimal part of the number. If the precision is less than the number of digits, extra digits will be removed without rounding; if it is more, zeroes will be added to the end to create the desired precision. If blank, the module will use -1, which means the precision will be the same as the number given; no digits added or removed.

Note that the return statement is a table. This means more styling or text can be added to the wrapper span tag, but it may also mean that tostring() may be required when used in other modules.

local gaps = require('Module:Gapnum').gaps

function example()
	local n = 123456.78900011
	-- Example for just simple formatting of a number
	-- n_gaps will use the default, .25em gaps and no change in precision
	-- The result will have its gaps created with inline css
	-- But the result would look like:
	-- 123 456.789 000 11
	local n_gaps = gaps(n)

	-- Different gap size
	-- These will format n into the same groups as above
	-- But the spaces between the groups will be larger and smaller, respectively
	local n_big_gaps = gaps(n, {gap='1em'})
	local n_small_gaps = gaps(n, {gap='1px'})

	-- Different precision
	-- n_prec_5 will use the number 123456.78900
	-- The result would look like:
	-- 123 456.789 00
	local n_prec_5 = gaps(n, {prec=5})
	-- n_prec_10 will use the number 123456.7890001100
	-- The result would look like:
	-- 123 456.789 000 1100
	local n_prec_10 = gaps(n, {prec=10})

	-- Both different gaps and precision can be used:
	local n_big_5 = gaps(n, {gap='1em', prec=5})
	local n_small_10 = gaps(n, {gap='1px', prec=10})


The groups function can be used in other modules to separate a number into groups as gaps does, but instead of a formatted string, the function will return tables whose elements are the separated groups.

local groups = require('Module:Gapnum').groups

function example()
	-- This will return one table:
	-- {123,456}
	local n1 = groups(123456)

	-- This will return two tables, each assigned to a different variable:
	-- n2a will be:
	-- {1,234}
	-- n2b will be:
	-- {567,89}
	local n2a,n2b = groups(1234.56789)

	-- This will return two tables:
	-- An integer part is always returned, even if it is 0
	-- n3a will be:
	-- {0}
	-- n3b will be:
	-- {123,4567}
	local n3a,n3b = groups(0.1234567)

	-- Just like the other functions, a precision can be defined
	-- precision is simply the second parameter
	-- n4a will be:
	-- {123}
	-- n4b will be:
	-- {456,700,00}
	local n4a,n4b = groups(123.4567,8)

local p = {}

local getArgs

function p.main(frame)
	if not getArgs then
		getArgs = require('Module:Arguments').getArgs

	local args = getArgs(frame, {wrappers = 'Template:Gapnum'})
	local n = args[1]

	if not n then
		error('Parameter 1 is required')
	elseif not tonumber(n) and not tonumber(n, 36) then -- Validates any number with base ≤ 36
		error('Unable to convert "' .. args[1] .. '" to a number')

	local gap =
	local precision = tonumber(args.prec)

	return p.gaps(n,{gap=gap,prec=precision})

-- Not named p._main so that it has a better function name when required by Module:Val
function p.gaps(n,tbl)
	local nstr = tostring(n)
	if not tbl then
		tbl = {}
	local gap = or '.25em'

	local int_part, frac_part = p.groups(n,tbl.prec)

	local ret = mw.html.create('span')
							-- No gap necessary on first group

	-- Build int part
	for _, v in ipairs(int_part) do

	if frac_part then
		-- The first group after the decimal shouldn't have a gap
		ret:wikitext('.' .. table.remove(frac_part,1))
		-- Build frac part
		for _, v in ipairs(frac_part) do

	return ret

-- Creates tables where each element is a different group of the number
function p.groups(num,precision)
	local nstr = tostring(num)
	if not precision then
		precision = -1

	local decimalloc = nstr:find('.', 1, true)
	local int_part, frac_part
	if decimalloc == nil then
		int_part = nstr
		int_part = nstr:sub(1, decimalloc-1)
		frac_part = nstr:sub(decimalloc + 1)
	-- only define ret_i as an empty table, let ret_d stay nil
	local ret_i,ret_d = {}
	-- Loop to handle most of the groupings; from right to left, so that if a group has less than 3 members, it will be the first group
	while int_part:len() > 3 do
		-- Insert in first spot, since we're moving backwards
		int_part = int_part:sub(1,-4)
	-- handle any left over numbers
	if int_part:len() > 0 then

	if precision ~= 0 and frac_part then
		ret_d = {}
		if precision == -1 then
			precision = frac_part:len()
		-- Reduce the length of the string if required precision is less than actual precision
		-- OR
		-- Increase it (by adding 0s) if the required precision is more than actual
		local offset = precision - frac_part:len()
		if offset < 0 then
			frac_part = frac_part:sub(1,precision)
		elseif offset > 0 then
			frac_part = frac_part .. string.rep('0', offset)

		-- Allow groups of 3 or 2 (3 first)
		for v in string.gmatch(frac_part,'%d%d%d?') do
		-- Preference for groups of 4 instead of groups of 1 at the end
		if #frac_part % 3 == 1 then
			if frac_part:len() == 1 then
				ret_d = {frac_part}
				local last_g = ret_d[#ret_d] or ''
				last_g = last_g..frac_part:sub(-1)
				ret_d[#ret_d] = last_g

	return ret_i,ret_d

return p