Mô đun:Check for unknown parameters

-- This module may be used to compare the arguments passed to the parent
-- with a list of arguments, returning a specified result if an argument is
-- not on the list
require ('strict');
local p = {}
local function trim(s)
	return s:match('^%s*(.-)%s*$')
end
local function isnotempty(s)
	return s and s:match('%S')
end
local function clean(text)
	-- Return text cleaned for display and truncated if too long.
	-- Strip markers are replaced with dummy text representing the original wikitext.
	local pos, truncated
	local function truncate(text)
		if truncated then
			return 
		end
		if mw.ustring.len(text) > 25 then
			truncated = true
			text = mw.ustring.sub(text, 1, 25) .. '...'
		end
		return mw.text.nowiki(text)
	end
	local parts = {}
	for before, tag, remainder in text:gmatch('(^\127*)\127^\127*%-(%l+)%-^\127*\127()') do
		pos = remainder
		table.insert(parts, truncate(before) .. '...')
	end
	table.insert(parts, truncate(text:sub(pos or 1)))
	return table.concat(parts)
end
function p._check(args, pargs)
	if type(args) ~= "table" or type(pargs) ~= "table" then
		-- TODO: error handling
		return
	end
	-- create the list of known args, regular expressions, and the return string
	local knownargs = {}
	local regexps = {}
	for k, v in pairs(args) do
		if type(k) == 'number' then
			v = trim(v)
			knownargsv = 1
		elseif k:find('^regexp1-90-9*$') then
			table.insert(regexps, '^' .. v .. '$')
		end
	end
	-- loop over the parent args, and make sure they are on the list
	local ignoreblank = isnotempty(args'ignoreblank')
	local showblankpos = isnotempty(args'showblankpositional')
	local values = {}
	for k, v in pairs(pargs) do
		if type(k) == 'string' and knownargsk == nil then
			local knownflag = false
			for _, regexp in ipairs(regexps) do
				if mw.ustring.match(k, regexp) then
					knownflag = true
					break
				end
			end
			if not knownflag and ( not ignoreblank or isnotempty(v) )  then
				table.insert(values, clean(k))
			end
		elseif type(k) == 'number' and knownargstostring(k) == nil then
			local knownflag = false
			for _, regexp in ipairs(regexps) do
				if mw.ustring.match(tostring(k), regexp) then
					knownflag = true
					break
				end
			end
			if not knownflag and ( showblankpos or isnotempty(v) ) then
				table.insert(values, k .. ' = ' .. clean(v))
			end
		end
	end
	-- add results to the output tables
	local res = {}
	if #values > 0 then
		local unknown_text = args'unknown' or 'Tìm thấy _VALUE_, '
		if mw.getCurrentFrame():preprocess( "" ) == "" then
			local preview_text = args'preview'
			if isnotempty(preview_text) then
				preview_text = require('Module:If preview')._warning({preview_text})
			elseif preview_text == nil then
				preview_text = unknown_text
			end
			unknown_text = preview_text
		end
		for _, v in pairs(values) do
			-- Fix odd bug for | = which gets stripped to the empty string and
			-- breaks category links
			if v ==  then v = ' ' end
			-- avoid error with v = 'example%2' ("invalid capture index")
			local r = unknown_text:gsub('_VALUE_', {_VALUE_ = v})
			table.insert(res, r)
		end
	end
	return table.concat(res)
end
function p.check(frame)
	local args = frame.args
	local pargs = frame:getParent().args
	return p._check(args, pargs)
end
return p