มอดูล:Change

-- This implements 
local p = {}
local function ntsh(outvalue)
	local sortkey = '0000000000000000000'
	if outvalue == nil then
		return 
	end
	
	-- This code was copied from Template:Convert	
	if outvalue == 0 then
		sortkey = '5000000000000000000'
	else
		local mag = math.floor(math.log10(math.abs(outvalue)) + 1e-14)
		local prefix
		if outvalue > 0 then
			prefix = 7000 + mag
		else
			prefix = 2999 - mag
			outvalue = outvalue + 10^(mag+1)
		end
		sortkey = string.format('%d', prefix) .. string.format('%015.0f', math.floor(outvalue * 10^(14-mag)))
	end
	return 
end
local function trim(s)
	return s:match('^%s*(.-)%s*$')
end
local function isnotempty(s)
	return s and trim(s) ~= 
end
function change(args)
	local rnd = require('Module:Math')._round
	local prec_format = require('Module:Math')._precision_format
	local lang = mw.getContentLanguage()
	local function formatnum(num)
		return lang:parseFormattedNumber(num) and lang:formatNum(lang:parseFormattedNumber(num)) or num
	end
	
	local errorflag = nil
	
	local dsp = args'disp' or 'row'
	local inv = args'invert' or 'off'
	local srt = args'sort' or ((isnotempty(args'pre') or isnotempty(args'sort')) and 'on' or 'off')
	local n1 = (inv == 'on') and tonumber(lang:parseFormattedNumber(args'2')) or tonumber(lang:parseFormattedNumber(args'1'))
	local n2 = (inv == 'on') and tonumber(lang:parseFormattedNumber(args'1')) or tonumber(lang:parseFormattedNumber(args'2'))
	local dec = args'dec' or '2'
	local s = ((args'italics' or 'off') == 'on' and "" or "")
			.. ((args'bold' or 'off') == 'on' and "" or "")
	
	local pc, pcr, pcrf = 'NA', 'NA'
	
	if n1 and n2 and n1 ~= 0 then
		pc = 100*(n2/n1 - 1)
		pcr = rnd(pc, dec)
		if pcr > 0 then
			pcrf =  ..
				s .. '+' .. prec_format(pc, dec) .. '%' .. s .. 
		elseif pcr ' ..
				s .. prec_format(pc, dec) .. '%' .. s .. 
		else
			pcrf = s .. prec_format(0, dec) .. '%' .. s
		end
		pcrf = ntsh(pcr) .. pcrf
	else
		pcrf = ntsh(nil) .. s .. 'NA' .. s
		if n1 == nil or n2 == nil then
			errorflag = 1
		end
	end
	
	if dsp == 'out' then
		return pcrf, errorflag
	else
		local pre1 = args'pre1' or args'pre' or 
		local pre2 = args'pre2' or args'pre' or 
		local suf1 = args'suf1' or args'suf' or 
		local suf2 = args'suf2' or args'suf' or 
		local rspn = 'rowspan=' .. (args'rowspan' or '1') .. ' '
		local algn = 'text-align:' .. (args'align' or 'right') .. ';'
		local bg = 'background-color:' .. (args'bgcolour' or args'bgcolor' or 'inherit') .. ';'
		if rspn == 'rowspan=1 ' then rspn =  end
		if bg == 'background-color:inherit;' then bg =  end
		local style = rspn .. 'style="' .. algn .. bg .. '"'
		
		local sk1, sk2 = , 
		
		if srt == 'on' then
			sk1 = ntsh(n1)
			sk2 = ntsh(n2)
		end
		
		if n1 ~= nil then
			if n1 < 0 then
				n1 = '−' .. formatnum(-1*n1)
			else
				n1 = formatnum(n1)
			end
		else
			n1 = (inv == 'on') and (args'2' or ) or (args'1' or )
		end
		
		if n2 ~= nil then
			if n2 < 0 then
				n2 = '−' .. formatnum(-1*n2)
			else
				n2 = formatnum(n2)
			end
		else
			n2 = (inv == 'on') and (args'1' or ) or (args'2' or )
		end
		
		if dsp == 'row2' then
			return style .. '|' .. s .. pre2 .. n2 .. suf2 .. s
				.. '\n|' .. style .. '|' .. pcrf, errorflag
		else
			if inv == 'off' then
				return style .. '|' .. s .. pre1 .. n1 .. suf1 .. s
					.. '\n|' .. style .. '|' .. s .. pre2 .. n2 .. suf2 .. s
					.. '\n|' .. style .. '|' .. pcrf, errorflag
			else
				return style .. '|' .. s .. pre1 .. n2 .. suf1 .. s
					.. '\n|' .. style .. '|' .. s .. pre2 .. n1 .. suf2 .. s
					.. '\n|' .. style .. '|' .. pcrf, errorflag
			end
		end
	end
end
function p.main(frame)
	local res, eflag = change((frame.args1 or frame.args2) and frame.args or frame:getParent().args)
	if eflag then
		res = res .. frame:expandTemplate{title = 'change/error'}
	end
	return res
end
return p