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This module is rated as beta, and is ready for widespread use. It is still new and should be used with some caution to ensure the results are as expected.

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:Transclude|template_name}}

Code

-- <nowiki>
--------------------------------------------------------------------------------
-- Module that allows transcluding a template with all parent arguments.
-- Useful in `/i18n` template subpages that delegate to a `/layout` subpage.
--
-- @module transclude
-- @author [[User:ExE Boss]]
--------------------------------------------------------------------------------

require('strict')
local checkType = require('libraryUtil').checkType;

local p = {}
local INVALID_TITLES = {
	["."]	= true,
	[".."]	= true,
};

local function _ne(value)
	return value and value ~= ''
end

--------------------------------------------------------------------------------
-- Helper function that merges argument tables.
--
-- @function mergeArgs
-- @param {table} inArgs
-- @param {table} outArgs
--------------------------------------------------------------------------------
local function mergeArgs(inArgs, outArgs, opts)
	checkType("mergeArgs", 1, inArgs, "table");
	checkType("mergeArgs", 2, outArgs, "table");
	checkType("mergeArgs", 3, opts, "table", true);
	opts = opts or {}

	local ignoredParams = opts.ignoredParams;
	local ignoredPrefix = opts.ignoredPrefix;

	for name, value in pairs(inArgs) do
		if (type(name) == "string") then
			if not (
				(ignoredParams and ignoredParams[name] == true)
				or (ignoredPrefix and
					ignoredPrefix == name:sub(1, ignoredPrefix:len()))
			) then
				outArgs[name] = value;
			end
		else
			outArgs[name] = value;
		end
	end

	return outArgs;
end

-- Exported for testing:
p['#mergeArgs'] = mergeArgs;

local mt = {};

function mt.__index(_, name)
	if (
		type(name) ~= "string"
		or INVALID_TITLES[name]
		or mw.ustring.find(name, "#", nil, true)
	) then
		return nil;
	end

	local title = mw.title.new(name, "Template")
	if (not title) then
		return nil;
	end

	return function (frame)
		checkType('transclude["' .. name .. '"]', 1, frame, "table");
		local parentFrame = frame:getParent();

		local ignoredParams, ignoredPrefix;
		if _ne(frame.args["#ignoredParams"]) then
			ignoredParams = {};
            for m in mw.text.gsplit(frame.args["#ignoredParams"], '|', true) do
                ignoredParams[mw.text.trim(m)] = true;
            end
		end

		if _ne(frame.args['#ignoredPrefix']) then
			ignoredPrefix = frame.args['#ignoredPrefix'];
		end

		local args = {};
		if (parentFrame) then
			mergeArgs(parentFrame.args, args, {
				ignoredParams = ignoredParams,
				ignoredPrefix = ignoredPrefix,
			});
		end
		mergeArgs(frame.args, args, {
			ignoredPrefix = "#",
		});

		if (not title.exists) then
			return "[[:" .. title.fullText .. "]]";
		end

		return frame:expandTemplate{
			title = title,
			args = args,
		};
	end
end

return setmetatable(p, mt);