Module:Error/sandbox

 -- This module implements {{error}}.

 localp={}

 localfunction_error(args)
 localtag=mw.ustring.lower(tostring(args.tag))

 -- Work out what html tag we should use.
 ifnot(tag=='p'ortag=='span'ortag=='div')then
 tag='strong'
 end

 -- Generate the html.
 returntostring(mw.html.create(tag)
 :addClass('error')
 :cssText(args.style)
 :wikitext(tostring(args.messageorargs[1]orerror('no message specified',2)))
 )
 end

 functionp.error(frame)
 localargs
 iftype(frame.args)=='table'then
 -- We're being called via #invoke. The args are passed through to the module
 -- from the template page, so use the args that were passed into the template.
 args=frame.args
 else
 -- We're being called from another module or from the debug console, so assume
 -- the args are passed in directly.
 args=frame
 end
 -- if the message parameter is present but blank, change it to nil so that Lua will
 -- consider it false.
 ifargs.message==""then
 args.message=nil
 end
 return_error(args)
 end

 returnp