Module:Lighthouse tracking

local p = {} function p.tracking(frame) local res = '' local isNRHP = false local hasNRHPbox = false local heritage = frame.args.heritage or '' if heritage == '' then elseif (heritage:match('National Register of Historic Places') or		heritage:match('NRHP') ) then res = res .. ''		isNRHP = true end for k, v in pairs( frame:getParent.args ) do		if k and k == 'module' then if v and v:match('<tr') then if v:match('National Register of Historic Places') or v:match('NRHP') or v:match('U.S. Historic district') or v:match('U.S. National Register of Historic Places') then hasNRHPbox = true end end end end if hasNRHPbox == false and isNRHP == true then res = res .. ''	end if hasNRHPbox == true and isNRHP == false then res = res .. ''	end return res end return p