25 lines
624 B
Lua
25 lines
624 B
Lua
local mt = getmetatable(_G)
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if mt == nil then
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mt = {}
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setmetatable(_G, mt)
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end
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mt.__declared = {}
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function mt.__newindex(t, n, v)
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if not mt.__declared[n] then
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local info = debug.getinfo(2, "S")
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if info and info.what ~= "main" and info.what ~= "C" then
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error("cannot assign undeclared global '" .. tostring(n) .. "'", 2)
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end
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mt.__declared[n] = true
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end
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rawset(t, n, v)
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end
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function mt.__index(t, n)
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if not mt.__declared[n] then
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local info = debug.getinfo(2, "S")
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if info and info.what ~= "main" and info.what ~= "C" then
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error("cannot use undeclared global '" .. tostring(n) .. "'", 2)
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end
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end
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end |