Module:TNTFallback

This module depends on the following other modules:

Module:TNT

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.

Usage

{{#invoke:TNTFallback|function_name}}

--------------------------------------------------------------------------------
-- This module implements a wrapper for [[Module:TNT]] that allows returning
-- a fallback message; used by {{Documentation}}.
--
-- @module TNTFallback
-- @alias  p
-- @author [[User:ExE Boss]]
-- @require [[Module:TNT]]
--------------------------------------------------------------------------------

require("strict");
local TNT = require("Module:TNT");

local p = {};

--------------------------------------------------------------------------------
-- Based on [[Module:TNT]]'s `msg` function,
-- but takes an optional `fallback` parameter.
--------------------------------------------------------------------------------
function p.msg(frame)
	local dataset, key;
	local params = { n = 0 };
	local lang = nil;
	local fallback = nil;

	for k, v in pairs(frame.args) do
		if (k == 1) then
			dataset = v;
		elseif (k == 2) then
			key = v;
		elseif (type(k) == "number" and k > 2) then
			local i = k - 2;
			params[i] = v;
			params.n = math.max(params.n, i);
		elseif ((k == "lang") and (v ~= "_")) then
			lang = v;
		elseif ((k == "fallback") and (v ~= "")) then
			fallback = v;
		end
	end

	local result;
	if (lang) then
		result = TNT.formatInLanguage(lang, dataset, key, unpack(params, 1, params.n));
	else
		result = TNT.format(dataset, key, unpack(params, 1, params.n));
	end

	if (fallback and (
		-- not translated
		(result and result == TNT.formatInLanguage("en", dataset, key, unpack(params, 1, params.n)))
		-- no message
		or (not result)
	)) then
		if (not lang) then
			if (frame:callParserFunction("int:lang") ~= "en") then
				return mw.message.newRawMessage(fallback, unpack(params, 1, params.n)):plain();
			end
		elseif (lang ~= "en") then
			return mw.message.newRawMessage(fallback, unpack(params, 1, params.n)):plain();
		end
	end

	return result;
end

return p;