Difference between revisions of "Module:No globals"
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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...') |
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local mt = getmetatable(_G) or {} | local mt = getmetatable(_G) or {} | ||
| − | + | function mt.__index (t, k) | |
| − | mt.__index | + | if k ~= 'arg' then |
| − | if | ||
error('Tried to read nil global ' .. tostring(k), 2) | error('Tried to read nil global ' .. tostring(k), 2) | ||
end | end | ||
| − | return | + | return nil |
end | end | ||
| − | |||
function mt.__newindex(t, k, v) | function mt.__newindex(t, k, v) | ||
| − | if | + | if k ~= 'arg' then |
error('Tried to write global ' .. tostring(k), 2) | error('Tried to write global ' .. tostring(k), 2) | ||
end | end | ||
| − | + | rawset(t, k, v) | |
end | end | ||
setmetatable(_G, mt) | setmetatable(_G, mt) | ||
Latest revision as of 02:45, 18 May 2018
Documentation for this module may be created at Module:No globals/doc
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)
