I don't know if you've already used it, but Parsec includes some kind of a lexer through the Language<http://hackage.haskell.org/packages/archive/parsec/3.1.0/doc/html/Text-Parsec-Language.html>and Token<http://hackage.haskell.org/packages/archive/parsec/3.1.0/doc/html/Text-Parsec-Token.html>modules. You can start by having a look at the makeTokenParser<http://hackage.haskell.org/packages/archive/parsec/3.1.0/doc/html/Text-Parsec-Token.html#v:makeTokenParser> function.
On 31 October 2010 15:11, Nils Schweinsberg <m...@n-sch.de> wrote: > Hi! > > I'm having a really hard time to write a correct parser for a small > language I've developed. I have been trying to write a parser using parsec, > but always get a lot of error messages like "unexpected "\n", expected ..., > new-line or..." when trying to run the parser. Then I read about the happy > parser and really liked the separation of lexing the text into tokens and > parsing the actual logic behind those tokens. Since I couldn't get familiar > with the lexer "alex" I gave up on the alex-happy-approach again and went > back to parsec. But with that lexer->parser idea on my mind, my parser > currently looks a lot like a lexer. So I came up with the idea of using a > combination of parsec and happy, where I generate a list of tokens for my > text via parsec and analyse it with happy. > > > My questions would be: > > - Is this a valid approach? > > - What is your workflow on parsing complex data structures? > > - What about performance? Since my project is going to be an interpreted > language parsing performance might be interesting aswell. I've read that > happy is in general faster than parsec, but what if I combine both of them > as I said above? I guess that parsing a simple list of tokens without any > nested parser structures would be pretty fast? > > - Do you have any other ideas on how to improve my parser? > > - What are your general thoughts on happy vs. parsec? > > > Thanks for any replies, > > Nils > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > -- Ozgur Akgun
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