Module:No globals: Difference between revisions
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m 3 revisions imported: importing all languages |
metawikimedia>MusikAnimal m Protected "Module:No globals": High-risk Lua module ([Edit=Allow only autoconfirmed users] (indefinite) [Move=Allow only autoconfirmed users] (indefinite)) |
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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) | |||