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