Module:No globals

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Revision as of 14:38, 23 April 2014 by Jackmcbarn (talk) (Created page with 'local mt = getmetatable(_G) or {} local oldIndex = mt.__index or function() return nil end mt.__index = function(t, k) if k ~= 'name' and k ~= 'arg' then erro...')
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Documentation for this module may be created at Module:No globals/doc

local mt = getmetatable(_G) or {}
local oldIndex = mt.__index or function() return nil end
mt.__index = function(t, k)
	if k ~= 'name' and k ~= 'arg' then
		error('Tried to read nil global ' .. tostring(k), 2)
	end
	return oldIndex(t, k)
end
local oldNewindex = mt.__newindex or rawset
function mt.__newindex(t, k, v)
	if k ~= 'name' and k ~= 'arg' then
		error('Tried to write global ' .. tostring(k), 2)
	end
	oldNewindex(t, k, v)
end
setmetatable(_G, mt)