Module:Data

This Lua module is used on many pages and changes may be widely noticed. Test changes in the module's /sandbox or /testcases subpages, or in your own module sandbox. Consider discussing changes on the talk page before implementing them.

This module is subject to page protection. It is a highly visible module in use by a very large number of pages, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing.

This module allows wikitext to read values from data modules.

Usage

{{#invoke:Data|Module:ModuleName|key1|key2|key3|...}}

Read data value key1.key2.key3 from Module:ModuleName.

local mt = {}

function mt.__index(t, k)
	return function(frame)
		local data = mw.loadData(k)
		local i = 1
		for _,v in ipairs(frame.args) do
			local ty = type(data)
			if ty ~= 'table' then
				local args = {}
				for j = 1, i - 1 do
					args[j] = frame.args[j]
				end
				if frame.args.softfail then
					return '<span class="error">[[Category:Pages with failed Module:Data lookups]]Error: Tried to read index "' .. mw.text.nowiki(v) .. '" of mw.loadData("' .. mw.text.nowiki(k) .. '").' .. mw.text.nowiki(table.concat(args, '.')) .. ', which is a ' .. ty .. '</span>'
				else
					error('Tried to read index "' .. v .. '" of mw.loadData("' .. k .. '").' .. table.concat(args, '.') .. ', which is a ' .. ty)
				end
			end
			data = data[v]
			i = i + 1
		end
		return data
	end
end

return setmetatable({}, mt)