Difference between revisions of "Module:No globals"

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

Latest revision as of 02:45, 18 May 2018

Documentation for this module may be created at Module:No globals/doc

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