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-- 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
local p = {}
 
local function isnotempty(s)
	return s and s:match( '^%s*(.-)%s*$' ) ~= ''
end
 
function p.check (frame)
	local args = frame.args
	local pargs = frame:getParent().args
	local ignoreblank = isnotempty(frame.args['ignoreblank'])
	local checkpos = isnotempty(frame.args['checkpositional'])
	local knownargs = {}
	local unknown = 'Found _VALUE_, '
 
	local res = {}
	local comments = {}
	local commentstr = ''
 
	-- create the list of known args, and the return string
	for k, v in pairs(args) do
		if type(k) == 'number' then
			v = mw.ustring.gsub(v, '^%s*(.-)%s*$', '%1')
			knownargs[v] = 1
		else
			if (k == 'unknown' and type(v) == 'string') then
				unknown = v
			end
		end
	end
 
	-- loop over the parent args, and make sure they are on the list
	for k,v in pairs(pargs) do
		if (type(k) == 'string' and knownargs[k] == nil) then
			if( (not ignoreblank) or (ignoreblank and isnotempty(v)) ) then
				k = mw.ustring.gsub(k, '[^%w\-_ ]', '?')
				local r = mw.ustring.gsub(unknown, '_VALUE_', k)
				table.insert(res, r)
				table.insert(comments, '"' .. k .. '"')
			end
		elseif(checkpos and type(k) == 'number' and knownargs[tostring(k)] == nil) then
			if( (not ignoreblank) or (ignoreblank and isnotempty(v)) ) then
				local r = mw.ustring.gsub(unknown, '_VALUE_', k)
				table.insert(res, r)
				table.insert(comments, '"' .. k .. '"')
			end
		end
	end
 
	if(#comments > 0) then
		commentstr = '<!-- Module:Check for unknown parameters results: ' ..
			table.concat(comments, ', ') .. '-->'
	end
 
	return table.concat(res) .. commentstr
end
 
return p

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