-- check classes
local classes, alreadyon = {}, {}
for w in string.gmatch(matches[2], "%a+") do
  if svo.classes[w] and not svo.enabledclasses[w] then classes[#classes+1] = w -- weed out invalid names
  elseif svo.classes[w] and svo.enabledclasses[w] then alreadyon[#alreadyon+1] = w end
end

for i = 1, #classes do
  svo.enableclass(classes[i])
end

local setsomething = false
if classes[1] then
  svo.echof("Enabled %s %sclass%s.", svo.concatand(classes), (not only and '' or "only the "), (#classes == 1 and '' or 'es'))
  setsomething = true
end
if alreadyon[1] then
  svo.echof("%s %s already on.", svo.concatand(alreadyon):title(), (#alreadyon == 1 and 'is' or 'are'))
  setsomething = true
end

if not setsomething then
  svo.echof("'%s' isn't something you can change.", matches[2])
end