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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 trim(s)
  return s:match('^%s*(.-)%s*$')
end
 
local function isnotempty(s)
  return s and trim(s) ~= ''
end
 
function p.check (frame)
  local args = frame.args
  local pargs = frame:getParent().args
  local ignoreblank = isnotempty(frame.args['ignoreblank'])
  local showblankpos = isnotempty(frame.args['showblankpositional'])
  local knownargs = {}
  local unknown = frame.args['unknown'] or 'Found _VALUE_, '
  local preview = frame.args['preview']
  local values = {}
  local res = {}
  local regexps = {}
-- create the list of known args, regular expressions, and the return string
  for k, v in pairs(args) do
    if type(k) == 'number' then
      v = trim(v)
      knownargs[v] = 1
    elseif k:find('^regexp[1-9][0-9]*$') then
      table.insert(regexps, '^' .. v .. '$')
    end
  end
  if isnotempty(preview) then
    preview = '<div class="hatnote" style="color:red"><strong>Увага:</strong> ' .. preview .. ' (це повідомлення відображається лише у попередньому перегляді сторінки).</div>'
  elseif preview == nil then
    preview = unknown
  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
      local knownflag = false
      for i, 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
        k = mw.ustring.gsub(k, '[^%w\-_ ]', '?')
        table.insert(values, k)
      end
    elseif type(k) == 'number' and knownargs[tostring(k)] == nil and ( showblankpos or isnotempty(v) ) then
      local vlen = mw.ustring.len(v)
      v = mw.ustring.sub(v, 1, (vlen < 25) and vlen or 25)
      v = mw.ustring.gsub(v, '[^%w\-_ ]', '?')
      table.insert(values, k .. ' = ' .. v .. ((vlen >= 25) and ' ...' or ''))
    end
  end
-- add resuls to the output tables
  if #values > 0 then
    if frame:preprocess( "{{REVISIONID}}" ) == "" then
      unknown = preview
    end
    for k, v in pairs(values) do
      if v == '' then
-- Fix odd bug for | = which gets stripped to the empty string and
-- breaks category links
        v = ' '
      end
      local r = unknown:gsub('_VALUE_', v)
      table.insert(res, r)
    end
  end
  return table.concat(res)
end
 
function p.check_old (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 regexps = {}
	local comments = {}
	local commentstr = ''
 
	-- create the list of known args, regular expressions, and the return string
	for k, v in pairs(args) do
		if type(k) == 'number' then
			v = mw.ustring.gsub(v, '^%s*(.-)%s*$', '%1')
			knownargs[v] = 1
		else
			if (k == 'unknown' and type(v) == 'string') then
				unknown = v
			elseif (mw.ustring.match(k, '^regexp[%d]*$') and type(v) == 'string') then
				table.insert(regexps, '^' .. 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
			local knownflag = nil
			for r = 1,#regexps do
				if( mw.ustring.match(k,regexps[r]) ) then
					knownflag = 1
				end
			end
			if( (not knownflag) and ( (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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