On Thu, Aug 03, 2006 at 08:40:26AM +0200, Harald ROTTER wrote:
> Thanks for the hint, I will try to implement the suggested monadic
> structure.
I realized perhaps I should have made the hint slightly more explicit by
changing the name:
newtype ParserT m a = ParserT { runParserT :: (PState ->
On Wed, Aug 02, 2006 at 10:52:14AM +0200, Harald ROTTER wrote:
> newtype Parser a = Parser { runParser :: (PState -> [(a, PState)])}
>
> as the parsing monad with the Parser state "PState" that contains the
> remaining input after matching and possibly some additional user defined
> state element
On Wed, Feb 08, 2006 at 12:59:48AM -0500, David Menendez wrote:
> Since the monad transformers in MTL all promote MonadError, you can also
> use throwError and catchError with instances of MonadIO. Currently, the
> error type associated with IO is IOError, not Exception, but it should
> be possible
On Mon, Feb 06, 2006 at 03:36:17PM +, Simon Marlow wrote:
> The reason we can't just go right ahead and do The Right Thing (i.e.
> introduce a new ADT for FilePaths) is because it touches so much other
> stuff, including stuff that also needs revising, so it doesn't feel
> right to just fix
On Sun, Nov 20, 2005 at 08:54:35AM -0500, David Roundy wrote:
> As an aside, what's responsible for the insanity of pattern matching record
> fields being backwards? I'd bar = b to bind b to bar, not the other way
> around... why should record pattern matching use '=' in a manner opposite
> from th
On Fri, Jul 08, 2005 at 02:51:11PM +0100, Colin Runciman wrote:
> >>My interaction depends on the (subtle order of) evaluation of a pure and
> >>total function?
> >>
> Pure, yes; total, no.
>
> Many important things depend on order of evaluation in lazy programs:
> for example, whether they comput
On Wed, Apr 27, 2005 at 03:56:38PM -0700, John Meacham wrote:
> for now, these are equivalent.
>
> ghc --make Main.hs -o foo
> jhc Main.hs -o foo
>
> jhc is effectivly always in --make mode.
I suggest you make it possible not to operate in --make mode. A build
system usually wants to know whi
[I think it is preferred to post this on haskell-cafe.]
On Fri, Mar 18, 2005 at 02:00:37PM -0800, Juan Carlos Arevalo Baeza wrote:
> matchRuleST :: String -> State RuleSet (Maybe Rule)
> makeST :: String -> StateT RuleSet IO ()
>
> matchRuleST doesn't really need IO for anything (it just works
On Wed, Jul 07, 2004 at 01:18:54PM +0100, Graham Klyne wrote:
> There's a pattern of higher-order function usage I find myself repeatedly
> wanting to use, exemplified by the following:
>
> [[
> -- combineTest :: (Bool->Bool->Bool) -> (a->Bool) -> (a->Bool) -> (a->Bool)
> combineTest :: (b->c->d)
On Wed, Feb 18, 2004 at 02:45:15PM +0100, Daan Leijen wrote:
> On Wed, 18 Feb 2004 01:11:31 -0500, Andrew Pimlott <[EMAIL PROTECTED]>
> wrote:
> >After some pondering and fiddling, a version I like:
> >
> >notFollowedBy' :: Show a =>
On Wed, Feb 18, 2004 at 02:45:15PM +0100, Daan Leijen wrote:
> On Wed, 18 Feb 2004 01:11:31 -0500, Andrew Pimlott <[EMAIL PROTECTED]>
> wrote:
> >After some pondering and fiddling, a version I like:
> >
> >notFollowedBy' :: Show a =>
On Tue, Feb 17, 2004 at 04:57:34PM -0500, Andrew Pimlott wrote:
> What about a more prosaic implementation:
>
> notFollowedBy' :: Show a => GenParser tok st a -> GenParser tok st ()
> notFollowedBy' p= do res <-
On Tue, Feb 17, 2004 at 07:48:52PM +, Graham Klyne wrote:
> Thanks! That got me going, though not with quite what you suggested.
>
> I ended up with this:
> [[
> notMatching :: Show a => GenParser tok st a -> GenParser tok st ()
> notMatching p = do { a <- try p ; unexpected (show a) } <|> re
On Tue, Feb 17, 2004 at 06:42:39PM +, Graham Klyne wrote:
> I've attempted to define a Parsec combinator thus:
>
> [[
> notMatching :: Show a => GenParser tok st a -> GenParser tok st ()
> notMatching p = try ( do { a <- p ; unexpected (show a) } <|> return () )
> ]]
If p fails but consumes s
On Mon, Feb 09, 2004 at 07:16:09PM +0100, Volker Wysk wrote:
> main = mainwrapper $
> call (execp "cat" ["nosuchfile"] -|- execp "echo" ["hello"])
>
> This happens to work right. The error is reported via a dynamic exception:
>
> ~/src/hsunix/build $ ./test2
> cat: nosuchfilehello
>
On Mon, Feb 09, 2004 at 12:49:28PM +0100, Tomasz Zielonka wrote:
> On Sun, Feb 08, 2004 at 09:36:16PM +0100, Volker Wysk wrote:
> > Error Handling
> > Error handling is one thing which is done much more thoroughly in
> > HsUnix than in shells. Failed programs won't be silently ignored.
> >
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