Module:Data

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--<pre>
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-- Helper module to get values from data module
-- Reads data value key1.key2, e.g.{["key1"]={["key2"]="baba"}} from Module:ModuleName/data.
-- Syntax: {{#invoke:Data|main|Module:ModuleName/data|key1|key2}} -> baba
-- Syntax: {{#invoke:Data|Module:ModuleName/data|key1|key2}} -> baba
--
-- @module data
-- @alias p
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local p = {}
local getArgs = require("Dev:Arguments").getArgs

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-- @function p.load
-- @param[opt] {string} modName
-- @param {sequence} args
-- @param {string} args[1] If `modName` is absent, then this is `modName`
-- @return {any}
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function p.load(modName, args)
	if (args == nil) then
		args = modName
		modName = nil
	end
	if (modName or args[1]) then 
		local data = mw.loadData(modName or args[1])
		
		for i,v in ipairs(args) do
			if (modName or i > 1) and data[v] then
				data = data[v]
			end
		end
		
		return data
	end
end

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-- @function p.main
-- @param {Frame} frame
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function p.main(frame)
	local args = getArgs(frame)
	return p.load(args)
end

local mt = {}
function mt.__index(t, k)
	if (
		type(k) == "string"
		and (
			mw.ustring.sub(k, 1, 4) == "Dev:"
			-- The "Module:" namespace prefix is case insensitive and can
			-- be preceded with a single colon
			or mw.ustring.match(k, "^:?[Mm][Oo][Dd][Uu][Ll][Ee]:")
		)
	) then
		return function (frame)
			local args = getArgs(frame)
			return p.load(k, args)
		end
	end
end

return setmetatable(p, mt)