[Haskell-cafe] Data.Generics question
Grote Collective
grotecollective at gmail.com
Tue Dec 19 05:12:46 EST 2006
Hello all,
I have two datatypes, both representing the same language. However, one is a
"flattened" version of the other. For instance:
data Flattened =
Const Flattened
| Sum Flattened Flattened
| ...
| IntConst Int
| RealConst Float
| BoolConst Bool
| Void
----
data Term =
Const Constant
| Sum Term Term
| ...
data Constant =
IntConst Int
| RealConst Float
| BoolConst Bool
| Void
Now I want to create functions to convert between these two datatypes. This
is easy to do but *very* tedious in its most naive approach. However, I
think I can use Data.Generics to make a simple implementation of both
functions. The question is: can I? I think that this conversion is a simple
fold over the structure, changing merely the constructor name (the qualified
name, because the unqualified name is the same), but I cannot seem to
understand from the documentation how to do this...
Thanks in advance,
Mark Smith
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