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40 lines
1.1 KiB
40 lines
1.1 KiB
-- --
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-- -- strict.lua
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-- -- checks uses of undeclared global variables
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-- -- All global variables must be 'declared' through a regular assignment
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-- -- (even assigning nil will do) in a main chunk before being used
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-- -- anywhere or assigned to inside a function.
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-- --
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-- -- modified for better compatibility with LuaJIT, see:
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-- -- http://www.freelists.org/post/luajit/strictlua-with-stripped-bytecode
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-- local getinfo, error, rawset, rawget = debug.getinfo, error, rawset, rawget
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-- 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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-- mt.__newindex = function (t, n, v)
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-- if not mt.__declared[n] then
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-- local info = getinfo(2, "S")
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-- if info and info.linedefined > 0 then
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-- LogError("assign to undeclared variable '"..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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-- mt.__index = function (t, n)
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-- if not mt.__declared[n] then
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-- local info = getinfo(2, "S")
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-- if info and info.linedefined > 0 then
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-- LogError("variable '"..n.."' is not declared", 2)
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-- end
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-- end
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-- return rawget(t, n)
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-- end
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