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模块:No globals

mediawiki1>Antigng2019年5月26日 (日) 10:06的版本 (ep:修正错误翻译)

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.)


local mt = getmetatable(_G) or {}
function mt.__index (t, k)
	if k ~= 'arg' then
		error('尝试读取空全局变量:' .. tostring(k), 2)
	end
	return nil
end
function mt.__newindex(t, k, v)
	if k ~= 'arg' then
		error('尝试写入全局变量:' .. tostring(k), 2)
	end
	rawset(t, k, v)
end
setmetatable(_G, mt)