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local util_args = require('Module:ArgsUtil')
local util_map = require('Module:MapUtil')
local util_text = require('Module:TextUtil')
-- MathUtil
local p = {}

function p.sign(v)
	if v == 0 then return 0 end
	return (v > 0 and 1) or -1
end

function p.printWithSign(v)
	return (v > 0 and ('+%s'):format(v)) or v
end

function p.roundnum(v, bracket)
	bracket = bracket or 1
	return math.floor(v/bracket + p.sign(v) * 0.5) * bracket
end

function p.percent(v, bracket)
	return p.roundnum(v * 100, bracket or 2) .. '%'
end

function p.mod(a, b)
	return a - math.floor(a/b)*b
end

function p.sum(tbl)
	local total = 0
	for _, v in pairs(tbl) do
		total = total + v
	end
	return total
end

function p.tonumber(str)
	if not str then return nil end
	local raw_number = str:gsub(',','')
	return tonumber(raw_number)
end

function p.formatNumber(str)
	local num = tonumber(str)
	if num then
		return mw.getLanguage('en'):formatNum(num)
	else
		return str
	end
end

function p.serialize(N)
	local chr = tostring(N):sub(-1)
	local lookup = { ['1'] = 'st', ['2'] = 'nd', ['3'] = 'rd' }
	return N .. (lookup[chr] or 'th')
end

function p.deserialize(str)
	local deserialized = str:gsub('[A-Za-z]*','')
	if deserialized == '' then
		return nil
	end
	return deserialized
end

function p.padleft(num, digits)
	local str = tostring(num)
	local tbl = util_text.split(str, '')
	local len = #tbl
	local outputTbl = {}
	for k = 1, len do
		outputTbl[k] = tbl[len + 1 - k]
	end
	for k = len + 1, digits do
		outputTbl[k] = '0'
	end
	local outputReversed = table.concat(outputTbl, '')
	return outputReversed:reverse()
end

return p
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