Module:Check for unknown parameters

    From Nonbinary Wiki
    Revision as of 22:42, 25 November 2014 by m>Frietjes (add optional ignoreblank parameter)

    Documentation for this module may be created at Module:Check for unknown parameters/doc

    -- 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