[Haskell-cafe] `Expect'-like lazy reading/Parsec matching on TCP sockets

Bulat Ziganshin bulat.ziganshin at gmail.com
Wed Apr 4 11:14:14 EDT 2007

Hello Scott,

Wednesday, April 4, 2007, 6:39:22 PM, you wrote:

>>   vGetChar (StreamWithTimeout s t) = do
>>      timeout t (vGetChar s)
>>                (error "Timed out!")

> If possible, I would like to try and use lazy [Char]s -- this would greatly
> simplify my usage of the Parsec parser.

>> or, even simple, you can make your own variant of hGetContents which
>> adds a timeout checks before each next call to hGetChar or hGetBuf

> Can this be as simple as applying the parser against a string returned
> by the (modified) hGetContents, which will read all that is possible given
> a certain time constraint?

yes, with both variants. actually, second one should be easier to
implement and understand. you should look into unsafeInterleaveIO
section of http://haskell.org/haskellwiki/IO_inside

feel free to ask me if you need more help

Best regards,
 Bulat                            mailto:Bulat.Ziganshin at gmail.com

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