Module:No globals: Difference between revisions
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(←Created page with 'local mt = getmetatable(_G) or {} local oldIndex = mt.__index or function() return nil end mt.__index = function(t, k) if k ~= 'name' and k ~= 'arg' then erro...') |
(don't bother saving old __index or __newindex) |
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Line 1: | Line 1: | ||
local mt = getmetatable(_G) or {} |
local mt = getmetatable(_G) or {} |
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function mt.__index (t, k) |
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mt.__index = function(t, k) |
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if k ~= 'name' and k ~= 'arg' then |
if k ~= 'name' and k ~= 'arg' then |
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error('Tried to read nil global ' .. tostring(k), 2) |
error('Tried to read nil global ' .. tostring(k), 2) |
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end |
end |
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return |
return nil |
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end |
end |
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local oldNewindex = mt.__newindex or rawset |
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function mt.__newindex(t, k, v) |
function mt.__newindex(t, k, v) |
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if k ~= 'name' and k ~= 'arg' then |
if k ~= 'name' and k ~= 'arg' then |
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error('Tried to write global ' .. tostring(k), 2) |
error('Tried to write global ' .. tostring(k), 2) |
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end |
end |
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rawset(t, k, v) |
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end |
end |
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setmetatable(_G, mt) |
setmetatable(_G, mt) |
Revision as of 20:46, 23 April 2014
Documentation for this module may be created at Module:No globals/doc
local mt = getmetatable(_G) or {}
function mt.__index (t, k)
if k ~= 'name' and k ~= 'arg' then
error('Tried to read nil global ' .. tostring(k), 2)
end
return nil
end
function mt.__newindex(t, k, v)
if k ~= 'name' and k ~= 'arg' then
error('Tried to write global ' .. tostring(k), 2)
end
rawset(t, k, v)
end
setmetatable(_G, mt)