| So here is what I envision: I write the main
| application in Python. I write a (hopefully) small
| Haskell module that:
| a) Calls back to the main Python app for reading the
| text to be parsed, preferably using laziness.
| b) Parses the text, and maybe processes a bit.
| c) Returns the parsed
Simon Peyton-Jones writes:
If Python uses C's calling convention, it might be easy; just use
'foreign import' and 'foreign export' (see the FFI spec at
haskell.org).
I remember reading that the main program, that wants to call Haskell
code, would have to be compiled with a special Haskell
If I use an STRef to a record, will a new record be created
each time I want
to update a single field? Or can I expect GHC to optimize it
and have the field of the record updated in place?
You'll get a new record for each update. This might not be so bad
though, depending on the number
main = mapM (=putChar) getCharS where getCharS = getChar:getCharS
How would you suggest to neatly insert the error handling code into ?
\begin{code}
-- some suggestions for a little zoo of cats
module Main where
import IO
import Monad
main0 = interact id
main1 = getContents = putStr
main2 =
--- Simon Peyton-Jones [EMAIL PROTECTED] wrote:
| So here is what I envision: I write the main
| application in Python. I write a (hopefully) small
| Haskell module that:
| a) Calls back to the main Python app for reading
the
| text to be parsed, preferably using laziness.
| b) Parses the
module GT where
import Monad
import Monoid
import MonadState
import MonadWriter
import MonadRWS
-- Just a quick exercise in using monads.
-- Thought it'd be nice to share with the class.
data GOp
= PushVal Integer
| Push Integer
| Pop Integer
| Slide Integer
I'm not sure why someone hasn't suggested
main = interact id
which I think would accomplis everything you want, and probably be a heck
of a lot faster, as (apparently) putChar and getChar are quire
inefficient.
--
Hal Daume III
Computer science is no more about computers| [EMAIL
If I use an STRef to a record, will a new record be created
each time I want
to update a single field? Or can I expect GHC to optimize it
and have the field of the record updated in place?
You'll get a new record for each update. This might not be so bad
though, depending on the
On Wed, 13 Nov 2002, William Lee Irwin III wrote:
main = mapM_ (\h - mapM_ putChar = hGetContents h) = mapM (flip openFile $
ReadMode) = getArgs
On Wed, Nov 13, 2002 at 07:46:41AM -0800, Hal Daume III wrote:
main = interact id
There is a semantic difference here, as the version I posted
