One example from Rdio's image server code base: https://github.com/rdio/thor/blob/master/src/main/scala/com/rdio/thor/LayerParser.scala https://github.com/rdio/

One example from Rdio's image server code base: https://github.com/rdio/thor/blob/master/src/main/scala/com/rdio/thor/LayerParser.scala https://github.com/rdio/thor/blob/master/src/main/scala/com/... It's used to parse arbitrarily complex transformations to apply to an image in the URL.