On Fri, Jul 09, 2010 at 09:33:52AM +0100, Simon Marlow wrote:
On 08/07/2010 09:45, John Meacham wrote:
On Thu, Jul 08, 2010 at 07:09:29AM +0000, Simon Peyton-Jones wrote:
(ie as infix operators) and I have to squizzle around to re-interpret them as prefix operators. Not very cool. Something unified would be a Good Thing.
So, after thinking about it some, I think there may be a somewhat elegant solution.
I like the sound of it. I put the code for the Haskell 2010 fixity resolver together with a little testing framework in the haskell-prime repo:
There is also my one-pass layout algorithm that requires no interaction with the parser that I believe still has promise. It was able to properly layout all the wild code I threw at it (all of nofib). With the addition of that, we may achieve the holy grail of fully independent lexing,layout,parsing,and fixing of haskell code, and a specification that has a direct correspondence to an implementable algorithm! I actually just noticed that my layout code is now implemented in ghc: http://hackage.haskell.org/trac/haskell-prime/wiki/AlternativeLayoutRule I am curious what the results will be, I know that adding pattern guards to it would be complicated, I will have to check out how my algorithm was modified. John -- John Meacham - ⑆repetae.net⑆john⑈ - http://notanumber.net/