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 local p = {}  local function isnotempty(s) return s and s:match( '^%s*(.-)%s*$' ) ~= '' end  function p.check (frame) local args = frame.args local pargs = frame:getParent().args local ignoreblank = isnotempty(frame.args['ignoreblank']) local checkpos = isnotempty(frame.args['checkpositional']) local knownargs = {} local unknown = 'Found _VALUE_, '  local res = {} local regexps = {} local comments = {} local commentstr = ''  -- create the list of known args, regular expressions, and the return string for k, v in pairs(args) do if type(k) == 'number' then v = mw.ustring.gsub(v, '^%s*(.-)%s*$', '%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 = '' end  return table.concat(res) .. commentstr end  return p