Haskell Core Libraries (base package)ParentContentsIndex
Portability non-portable (uses existentially quantified data constructors)
Stability provisional

This module implements permutation parsers. The algorithm used is fairly complex since we push the type system to its limits :-) The algorithm is described in:

Parsing Permutation Phrases, by Arthur Baars, Andres Loh and Doaitse Swierstra. Published as a functional pearl at the Haskell Workshop 2001.

data PermParser tok st a
permute :: PermParser tok st a -> GenParser tok st a
(<||>) :: PermParser tok st (a -> b) -> GenParser tok st a -> PermParser tok st b
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