Jan Stolarek <jan.stola...@p.lodz.pl> wrote: > Thanks for replies guys. I indeed didn't notice that there are monads > and applicatives used in this parser. My thought that monadic parsers > are more verbose came from Hutton's paper where the code is definitely > less readable than in example I provided. > > There is one more thing that bothers me. It is easy to write a parser > that returns Nothing when parsing fails. But I can't figure out a way > to add meaningful error messages so that the user knows where did the > parsing fail. I experimented with using Either so that I can use Left > to pass error messages but this turned out to be inflexible and > clutered the code. I will be greatful for any ideas.
Remember that 'Either e' is also a monad. =) Greets, Ertugrul -- Key-ID: E5DD8D11 "Ertugrul Soeylemez <e...@ertes.de>" FPrint: BD28 3E3F BE63 BADD 4157 9134 D56A 37FA E5DD 8D11 Keysrv: hkp://subkeys.pgp.net/
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