I see now. I read the source code incorrectly. Now I know what to do. John
On Thu, Feb 28, 2013 at 8:40 AM, Ganesh Sittampalam <[email protected]> wrote: > Hi John, > > Using bytestring-handle, you can get this with something like > > stringHandle :: String -> Handle > stringHandle s = readHandle False (Data.ByteString.Char8.pack s) > > [note the complete disregard of encoding issues in the use of > Data.ByteString.Char8] > > Cheers, > > Ganesh > > On 28/02/2013 13:32, John D. Ramsdell wrote: >> I think I wasn't clear about my question. I want something that >> creates a value of type System.IO.Handle. You see, I have a high >> performance S-expression parser that I'd like to use in GHCi reading >> strings while at the command loop. >> >> Here is more details on my module SExpr that exports the SExpr data >> type and the load function. The desired function is called >> stringHandle. >> >> -- An S-expression >> data SExpr >> = S String -- A symbol >> | Q String -- A quoted string >> | N Int -- An integer >> | L [SExpr a] -- A proper list >> >> -- Read one S-expression or return Nothing on EOF >> load :: Handle -> IO (Maybe (SExpr Pos)) >> >> In GHCi, I want to type something like: >> >> SExpr> let h = stringHandle "()" >> SExpr> load h >> Just (L []) >> SExpr> load h >> Nothing >> SExpr> >> >> It seems to me right now that I have to implement a duplicate parser >> that implements Read. At least S-expression parsing is easy. >> >> John >> >> On Thu, Feb 28, 2013 at 3:02 AM, Ganesh Sittampalam <[email protected]> wrote: >>> Hi, >>> >>> On 27/02/2013 20:38, John D. Ramsdell wrote: >>>> How does one create a value of type System.IO.Handle for reading that >>>> takes its input from a string instead of a file? I'm looking for the >>>> equivalent of java.io.StringReader in Java. Thanks in advance. >>> >>> http://hackage.haskell.org/package/bytestring-handle can make handles >>> that read and write to ByteStrings. >>> >>> Cheers, >>> >>> Ganesh >>> >>> >> > _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
