gists/explicit_globals/corepatchlua.lua

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2015-05-25 18:56:30 -07:00
local mt = getmetatable(_G)
if mt == nil then
mt = {}
setmetatable(_G, mt)
end
mt.__declared = {}
function mt.__newindex(t, n, v)
if not mt.__declared[n] then
local info = debug.getinfo(2, "S")
if info and info.what ~= "main" and info.what ~= "C" then
error("cannot assign undeclared global '" .. tostring(n) .. "'", 2)
end
mt.__declared[n] = true
end
rawset(t, n, v)
end
function mt.__index(t, n)
if not mt.__declared[n] then
local info = debug.getinfo(2, "S")
if info and info.what ~= "main" and info.what ~= "C" then
error("cannot use undeclared global '" .. tostring(n) .. "'", 2)
end
end
end