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Module:No globals: Difference between revisions

Module Discussion
Content added Content deleted
(setting doesn't need exception for name)
m (1 revision imported)
 
(7 intermediate revisions by 5 users not shown)
Line 1: Line 1:
local mt = getmetatable(_G) or {}
local mt = getmetatable(_G) or {}
function mt.__index (t, k)
function mt.__index (t, k)
if k ~= 'name' and k ~= 'arg' then
if k ~= 'arg' then
error('Tried to read nil global ' .. tostring(k), 2)
error('Tried to read nil global ' .. tostring(k), 2)
end
end

Latest revision as of 23:14, 19 August 2019

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)
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