Module:No globals: Difference between revisions

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    m (Copying one change by Mainframe98: "From Module:No globals/sandbox, per Topic:Uyr5gphaxbpe5k4h" from mw:Module:No globals. (docs, translate))
    m (4 revisions imported from wikipedia:Module:No_globals: see Topic:Vtixlm0q28eo6jtf)
     
    (3 intermediate revisions by 2 users not shown)
    Line 2: Line 2:
    function mt.__index (t, k)
    function mt.__index (t, k)
    if k ~= 'arg' then
    if k ~= 'arg' then
    -- perf optimization here and below: do not load Module:TNT unless there is an error
    error('Tried to read nil global ' .. tostring(k), 2)
    error(require('Module:TNT').format('I18n/No globals', 'err-read', tostring(k)), 2)
    end
    end
    return nil
    return nil
    Line 9: Line 8:
    function mt.__newindex(t, k, v)
    function mt.__newindex(t, k, v)
    if k ~= 'arg' then
    if k ~= 'arg' then
    error(require('Module:TNT').format('I18n/No globals', 'err-write', tostring(k)), 2)
    error('Tried to write global ' .. tostring(k), 2)
    end
    end
    rawset(t, k, v)
    rawset(t, k, v)
    end
    end
    setmetatable(_G, mt)
    setmetatable(_G, mt)

    Latest revision as of 11:43, 21 May 2021

    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)