On Wed, Sep 30, 2009 at 3:37 AM, Dimitry Golubovsky
Hi,
I am trying to use the genericserialize package (http://hackage.haskell.org/package/genericserialize) but cannot get things working.
While buildList (sexpSerialize [1, 2, 3])
yields
"(1 2 3)"
as it might be expected, I cannot deserialize it back:
*Main> (withList sexpDeserialize $ buildList (sexpSerialize [1, 2, 3])) :: Maybe [Integer] Nothing
or
*Main> (withList sexpDeserialize $ buildList (sexpSerialize [1, 2, 3])) :: Maybe [Int] Nothing
while I would expect at least one of these cases result in Just [1, 2, 3]
What am I missing?
I'm not sure. I've never seen this library before, but I noticed this: withList sexpDeserialize $ "12" :: Maybe Int 12 withList sexpDeserialize $ "(12)" :: Maybe [Int] Just [12] So it would seem that the sexpDeserialize is not handling the spaces in the input. But, I don't think that's the real problem, look at this: withList sexpDeserialize $ "\"1 2 3\"" :: Maybe String Just "1 2 3" withList sexpDeserialize $ "(\"1 2 3\")" :: Maybe String Nothing withList sexpDeserialize $ "(\"1 2 3\")" :: Maybe [String] Just ["1 2 3"] So, it seems that the parens are making it into a list. But, this fails also: withList sexpDeserialize $ "(\"1\" \"2\" \"3\")" :: Maybe [String] Nothing Seems like using withList is wrong or the deserializer is simply buggy. It certainly doesn't work the way I would expect SExp reading to work. I also notice from reading the source on hackage that there may not be any tests for this package and it is a 0.1 release. I'd contact the author, as it seems there is a deficiency in the documentation or a bug in the implementation. Jason