Module:Switcher

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local function index(t, k)
	return function(frame)
		local root = mw.html.create('div'):addClass('switcher-container')
		local default = (tonumber(k) or 0) * 2 - 1
		for i,v in ipairs(frame.args) do
			if i % 2 == 1 then
				local span = root
					:tag('div')
						:wikitext(frame.args[i])
						:tag('span')
							:addClass('switcher-label')
							:css('display', 'none')
							:wikitext(mw.text.trim(frame.args[i + 1]))
				if i == default then
					span:attr('data-switcher-default', '')
				end
			end
		end
		return root
	end
end

return setmetatable({}, {__index = index})