On Fri, 16 May 2008, Achim Schneider wrote:
My problem is that realTopLevel = expr, and that I get into an infinite recursion, never "closing" enough parens, never hitting eof.
Have you run into the left-recursion trap, by any chance? This doesn't work: expr = do expr; ... You can cover common cases with combinators like many* and chain* though.
Btw: Is there any way to make Parsec return a tree of things it tried? The end-user error messages are quite often just not informative enough while debugging the parser itself.
If you're willing to accept a little pain, you can write a few helper functions akin to that keep a log in Parsec's state and extract it from there. -- flippa@flippac.org Society does not owe people jobs. Society owes it to itself to find people jobs.