local p = {}  local math = require "Module:Math"  local function getLengths(args, num)  local precision = math._precision  local round = math._round  local format = math._precision_format  local lengths = {}  local km = args["length_km" .. num] or ''  local mi = args["length_mi" .. num] or ''  local prec = tonumber(args["length_round" .. num])  if '' == km then  local n = tonumber(mi)  prec = prec or precision(mi)  if n then  lengths.km = format(tostring(n * 1.609344), tostring(prec))  else  lengths.km = '0'  end  else  prec = prec or precision(km)  lengths.km = format(km, tostring(prec))  lengths.orig = "กิโลเมตร"  lengths.comp = "ไมล์"  end  if '' == mi then  local n = tonumber(km)  prec = prec or precision(km)  if n then  lengths.mi = format(tostring(n / 1.609344), tostring(prec))  else  lengths.mi = '0'  end  else  prec = prec or precision(mi)  lengths.mi = format(mi, tostring(prec))  lengths.orig = "กิโลเมตร"  lengths.comp = "ไมล์"  end  return lengths end  function p._length(num, args)  local ref = args["length_ref" .. num] or ''  local notes = args["length_notes" .. num] or ''  local lengths = getLengths(args, num)   local first, second  if lengths.orig == "mi" then  first = lengths.mi  second = lengths.km  else  first = lengths.km  second = lengths.mi  end  if first == '0' and second == '0' then  return  end  local text = {first, "&nbsp;", lengths.orig, ref, " (", second, "&nbsp;", lengths.comp, ")", }  if notes ~= '' then  table.insert(text, "<br><small>" .. notes .. "</small>")  end  return table.concat(text) end  function p.length(frame)  local pframe = frame:getParent()  local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself  local args = pframe.args -- the arguments passed TO the template, in the wikitext that transcludes the template   local num = config.num or ''  return p._length(num, args) end  return p