(oops, sorry, didn't do reply to all) I use haskell-src-meta in QuasiText (on hackage) also. It would certainly be nice to have "native" anti-quotations, but for now haskell-src-meta does a very good job.
Mike On Sat, May 26, 2012 at 8:31 AM, Geoffrey Mainland <mainl...@apeiron.net>wrote: > On 05/25/2012 21:46, Antoine Latter wrote: > > On Fri, May 25, 2012 at 2:51 PM, Sam Lindley <sam.lind...@ed.ac.uk> > wrote: > >> Template Haskell supports antiquotation for built-in quasiquotes, e.g.: > >> > >> [| \x -> x + $([|3 * 4|]) |] > >> > >> However, as far as I can tell, there is no way of supporting > antiquotation > >> in user-defined quasiquoters, because the only way to specify a new > >> quasiquoter is through a quoteExp function of type String -> Q Exp. Of > >> course, it is perfectly possible to write a parser for some fragment of > >> Haskell inside your quoteExp function, but that seems crazy given that > >> Template Haskell or rather GHC already implements a parser for the whole > >> language. > >> > >> I know about Language.Haskell.Exts.Parser in haskell-src-exts, which > >> provides parseExp :: String -> ParseResult Exp, but that Exp is a > different > >> type to the one provided by Template > >> Haskell.< > http://hackage.haskell.org/packages/archive/haskell-src-exts/1.9.0/doc/html/Language-Haskell-Exts-Syntax.html#t:Exp > > > >> I'm also aware of Dominic Orchard's syntax-trees package, which supports > >> converting between the two representations using a cunning hack that > >> pretty-prints the haskell-src-exts representation to a string and uses > >> Template Haskell to parse it back. > >> > >> Is there a saner way of simulating antiquotation in user-defined > >> quasiquoters? > >> > > > > Have you looked at: > > > > http://hackage.haskell.org/package/haskell-src-exts-qq > > http://hackage.haskell.org/package/haskell-src-meta > > > > The might help you pull something together. > > > > > > Antoine > > > >> Sam > > I use haskell-src-meta in language-c-quote (also on hackage) to support > antiquotation and heartily endorse it. I have not used haskell-src-exts-qq. > > Geoff > > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe >
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