[Haskell-cafe] ANNOUNCE: Parsec 3.1.0

Job Vranish job.vranish at gmail.com
Thu Mar 4 13:06:43 EST 2010

Sweet :)

I'm glad that notFollowedBy has been fixed. I've often had to redefine it
because the type was to restrictive.

- Job

On Wed, Mar 3, 2010 at 11:45 PM, Derek Elkins <derek.a.elkins at gmail.com>wrote:

> Parsec is a monadic combinator library that is well-documented, simple
> to use, and produces good error messages.   Parsec is not inherently
> lazy/incremental and is not well-suited to handling large quantities
> of simply formatted data.  Parsec 3 adds to Parsec the ability to use
> Parsec as a monad transformer and generalizes the input Parsec
> accepts.  Parsec 3 includes a compatibility layer for Parsec 2 and
> should be a drop-in replacement for code using Parsec 2.  Code using
> the features of Parsec 3 should use the modules in Text.Parsec.
> Due almost entirely to the work of Antoine Latter there is a new
> version of Parsec 3 available.  He documented some of his thoughts on
> this in this series of blog posts:
> http://panicsonic.blogspot.com/2009/12/adventures-in-parsec.html
> The main features of this release are:
>    - the performance should be much better and comparable to Parsec 2
>    - notFollowedBy's type and behavior have been generalized
> Changes:
>    - the changes to the core of Parsec lead to some changes to when
> things get executed when it is used as a monad transformer
>        "In the new version bind, return and mplus no longer run in
> the inner monad, so if the inner monad was side-effecting for these
> actions the behavior of existing code will change."
>    - notFollowedBy p now behaves like notFollowedBy (try p) which
> changes the behavior slightly when p consumes input, though the
> behavior should be more natural now.
>    - the set of names exported from Text.Parsec.Prim has changed somewhat
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