Module:No globals: Difference between revisions
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Jackmcbarn (talk | contribs) don't bother saving old __index or __newindex |
Jackmcbarn (talk | contribs) setting doesn't need exception for name |
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end |
end |
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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 |
Revision as of 20:48, 23 April 2014
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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.)
Code
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 ~= 'arg' then
error('Tried to write global ' .. tostring(k), 2)
end
rawset(t, k, v)
end
setmetatable(_G, mt)