Re: [Haskell-cafe] Is there already a lib to parse a line of string with a pattern and generate key-value map or a record?

I feel like the type with Map is not very nice (as map can be anything). Given the simplicity of year parsing , how about traditional ``` data DateTime = DT Int Int Int timeP :: Parser DateTime timeP = DT <*> p <$> p <$> p where p = integer <* char '/' ``` Olaf Klinke writes:

You could emulate this with some custom parser combinators on top of any monadic parser combinator library such as attoparsec or megaparsec.

keyed :: (Ord key, Functor parser) => key -> parser a -> parser (Map key a) keyed key = fmap (singleton key)

Then, assuming 'char' and 'digitChar' exists in the parser library, you may write

integer = some digitChar logline = fmap mconcat $ sequence [ keyed "year" (integer <* char '/'), keyed "month" (integer <* char '/'), keyed "day" (integer <* char ' '), -- etc. ]

Olaf _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.