Re: automatic instances for pretty printing and parsing

Bulat Ziganshin <[email protected]> Thu, 27 Oct 2005 17:41:20 +0400

Newsgroups	gmane.comp.lang.haskell.template
Message-ID	<[email protected]>

Hello Johannes,

Tuesday, October 04, 2005, 4:26:27 PM, you wrote:

JW> I use Text.PrettyPrint.HughesPJ and
JW> Text.ParserCombinators.Parsec heavily so I made
JW> some DrIFT rules for deriving the "obvious" instances for

JW> so I'd like to investigate whether I could get the same effect
JW> with Template Haskell (in ghc) - and what this would cost.

well, it is not so pretty, but it works :)

try "ghc --make -ddump-splices test-derive.hs"

i wrote this to include in doc as an example of using reification
facilities, so if it can be simplified or better documented - say to me
:)


-- 
Best regards,
 Bulat                            mailto:[email protected]

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test-derive.hs (application/octet-stream, 173 B) - not displayed

derive.hs (application/octet-stream, 1.8 KB) - not displayed