scala-pipes

scala-pipes is an in-progress port to Scala and Scalaz of Gabriel Gonzalez's pipes, pipes-safe, and pipes-parse libraries for Haskell.

The design of scala-pipes revolves around a central, polymorphic abstraction: Proxy, implemented as a type class. All instances of Proxy can be treated as a kind of bidirectional enumerator, iteratee, or enumeratee. There is only one type (per Proxy transformer), similar to an enumeratee, and enumerator- and iteratee-equivalents are simply type synonyms over the type in question, themselves inherently polymorphic over the underlying Proxy.

There is one base Proxy, ProxyBaseT, which is a Monad transformer in addition to being a Proxy. Layerable on top of any other Proxy are various Proxy transformers, including:

• IdentityP
• ReaderP
• IndexedStateP (not implemented yet)
• WriterP (not implemented yet)
• IndexedReaderWriterStateP (not implemented yet)
• EitherP (not implemented yet)
• OptionP
• TryP (not implemented yet)
• CodensityP (not implemented yet)

scala-pipes currently depends on scalaz-7.0.2.