[Haskell-cafe] Re: Network parsing and parsec
jmaessen at alum.mit.edu
Wed Sep 21 13:36:58 EDT 2005
On Sep 20, 2005, at 6:32 PM, Benjamin Franksen wrote:
> On Tuesday 20 September 2005 16:50, John Goerzen wrote:
>> On the flip side, Parsec is really nice. I wonder how easy it would
>> be to make it parse [Word8] instead of String?
> Isn't Parsec parameterized over the token type?
>> Or even a
>> FastPackedString? (And how easy it would be to get that instead of a
>> String from hGetContents)?
> From the FPS haddock:
> hGetContents :: Handle -> IO FastString
> Read entire handle contents into a FastString.
> This may or may not do what you want...it's probably not a lazy read.
It seems like there might need to be something like:
hGetContentsLazily :: Handle -> IO [FastString]
which returns file contents in chunks based on our ability to buffer
the handle. If we can mmap the handle, we may get a singleton list
with a giant FastString; if we are using a Socket or a terminal, each
succeeding string might be the next chunk of available data from the
I had the impression the internals of getContents from the prelude
worked a bit like this (in GHC, anyway).
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