Difference between revisions of "Module:No globals"

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Mediawiki>Magog the Ogre
m (4 revisions imported from w:en:Module:No_globals)
m (1 revision imported)
Line 2: Line 2:
 
function mt.__index (t, k)
 
function mt.__index (t, k)
 
if k ~= 'arg' then
 
if k ~= 'arg' then
error('Tried to read nil global ' .. tostring(k), 2)
+
-- perf optimization here and below: do not load Module:TNT unless there is an error
 +
error(require('Module:TNT').format('I18n/No globals', 'err-read', tostring(k)), 2)
 
end
 
end
 
return nil
 
return nil
Line 8: Line 9:
 
function mt.__newindex(t, k, v)
 
function mt.__newindex(t, k, v)
 
if k ~= 'arg' then
 
if k ~= 'arg' then
error('Tried to write global ' .. tostring(k), 2)
+
error(require('Module:TNT').format('I18n/No globals', 'err-write', tostring(k)), 2)
 
end
 
end
 
rawset(t, k, v)
 
rawset(t, k, v)
 
end
 
end
 
setmetatable(_G, mt)
 
setmetatable(_G, mt)

Revision as of 18:36, 5 September 2021

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.)

See also


local mt = getmetatable(_G) or {}
function mt.__index (t, k)
	if k ~= 'arg' then
		-- perf optimization here and below: do not load Module:TNT unless there is an error
		error(require('Module:TNT').format('I18n/No globals', 'err-read', tostring(k)), 2)
	end
	return nil
end
function mt.__newindex(t, k, v)
	if k ~= 'arg' then
		error(require('Module:TNT').format('I18n/No globals', 'err-write', tostring(k)), 2)
	end
	rawset(t, k, v)
end
setmetatable(_G, mt)