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...') |
m (9 revisions imported from dev:Module:No_globals) |
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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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⚫ | |||
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 |
if 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) |
Latest revision as of 01:51, 27 December 2022
This module causes an error if any nil global is read or if any global is written to, with the exception of arg. To use, add require('Module:No globals')
to the top of the module using it. The arg variable is excluded because it is necessary for Scribunto's require function to work properly. (See the Scribunto source code here.)