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})
end
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)
end
local p = {}
local getArgs
function p.main(frame)
if not getArgs then
getArgs = require('Module:Arguments').getArgs
end
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')
end
local gap = args.gap
local precision = tonumber(args.prec)
return p.gaps(n,{gap=gap,prec=precision})
end
-- 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 = {}
end
local gap = tbl.gap or '.25em'
local int_part, frac_part = p.groups(n,tbl.prec)
local ret = mw.html.create('span')
:css('white-space','nowrap')
-- No gap necessary on first group
:wikitext(table.remove(int_part,1))
-- Build int part
for _, v in ipairs(int_part) do
ret:tag('span')
:css('margin-left',gap)
:wikitext(v)
end
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
ret:tag('span')
:css('margin-left',gap)
:wikitext(v)
end
end
return ret
end
-- 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
end
local decimalloc = nstr:find('.', 1, true)
local int_part, frac_part
if decimalloc == nil then
int_part = nstr
else
int_part = nstr:sub(1, decimalloc-1)
frac_part = nstr:sub(decimalloc + 1)
end
-- 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
table.insert(ret_i,1,int_part:sub(-3))
int_part = int_part:sub(1,-4)
end
-- handle any left over numbers
if int_part:len() > 0 then
table.insert(ret_i,1,int_part)
end
if precision ~= 0 and frac_part then
ret_d = {}
if precision == -1 then
precision = frac_part:len()
end
-- 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)
end
-- Allow groups of 3 or 2 (3 first)
for v in string.gmatch(frac_part,'%d%d%d?') do
table.insert(ret_d,v)
end
-- 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}
else
local last_g = ret_d[#ret_d] or ''
last_g = last_g..frac_part:sub(-1)
ret_d[#ret_d] = last_g
end
end
end
return ret_i,ret_d
end
return p
