Programming macro tree transducers

Patrick Bahr, Laurence E. Day

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A tree transducer is a set of mutually recursive functions transforming an input tree into an output tree. Macro tree transducers extend this recursion scheme by allowing each function to be defined in terms of an arbitrary number of accumulation parameters. In this paper, we show how macro tree transducers can be concisely represented in Haskell, and demonstrate the benefits of utilising such an approach with a number of examples. In particular, tree transducers afford a modular programming style as they can be easily composed and manipulated. Our Haskell representation generalises the original definition of (macro) tree transducers, abolishing a restriction on finite state spaces. However, as we demonstrate, this generalisation does not affect compositionality.
TitelProceedings of the 9th ACM SIGPLAN Workshop on Generic Programming
Antal sider12
UdgivelsesstedNew York, NY, USA
ForlagAssociation for Computing Machinery
Publikationsdato1 sep. 2013
ISBN (Trykt)978-1-4503-2389-5
StatusUdgivet - 1 sep. 2013


  • tree automaton, transducer, accumulation, composition, deforestation, Haskell, recursion scheme, nested recursion, polymorphism