Module:No globals: Difference between revisions

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meta>Jackmcbarn
(don't bother saving old __index or __newindex)
meta>Jackmcbarn
(setting doesn't need exception for name)
Line 7: Line 7:
end
end
function mt.__newindex(t, k, v)
function mt.__newindex(t, k, v)
if k ~= 'name' and k ~= 'arg' then
if k ~= 'arg' then
error('Tried to write global ' .. tostring(k), 2)
error('Tried to write global ' .. tostring(k), 2)
end
end

Revision as of 20:48, 23 April 2014

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 <syntaxhighlight lang="lua" inline>require('Module:No globals')</syntaxhighlight> 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.)

See also


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)