On Jan 31, 2013, at 10:47 , Jan Stolarek
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.
Use the uu-parsinglib library, which provides error messages, repairs your errors and using its idioms definition you can even write: inParens c = iI '(' c ')' Ii I think you cannot get it shorter and with more functionality. Doaitse
Janek
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