Parse Text CSS into JSON with Javascript

I just simply want something that will take a textarea full of CSS and turn it into JSON using the CSS JSON method.

{
    "selector-1":{
        "property-1":"value-1",
        "property-n":"value-n"
    }
}

http://www.featureblend.com/css-json.html

Does anyone know of something that will decode CSS into JSON? It would also be helpful if it could encode it as well.