Module:Transclude

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This documentation is transcluded from Module:Transclude/doc.

-- <nowiki>
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-- 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 [[Module:No globals]]
--------------------------------------------------------------------------------

require('Module:No globals')
local checkType = require('libraryUtil').checkType;

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

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

	for name, value in pairs(inArgs) do
		outArgs[name] = value;
	end

	return outArgs;
end

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 args = {};
		mergeArgs(frame:getParent().args, args);
		mergeArgs(frame.args, args);

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

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

return setmetatable({}, mt);