Module: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 = {} -- 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)			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)			end end end

return table.concat(res) end

return p