Sebastian Fischer schrieb: > Hello Christian, > > On Apr 19, 2010, at 4:48 PM, Christian Maeder wrote: > >> I like to announce a Haskell style scanner at >> http://hackage.haskell.org/package/scan >> >> Feedback is welcome. > > I get lots of "multiple blanks" which I'd rather not "correct". > > I often use multiple blanks to achieve vertical layout which is > especially useful in combination with lhs2TeX [1] whose polycode mode > requires multiple blanks to achieve proper indentation. > > This code > > instance Eq a => Eq (Maybe a) where > Nothing == Nothing = True > Just x == Just y = x == y > _ == _ = False
This sort of tabular layout is not supported by scan. > > triggers this scan output: > > scan-test.hs:2:10: up to column 12 multiple (2) blanks > scan-test.hs:2:14: up to column 16 multiple (2) blanks > scan-test.hs:2:23: up to column 25 multiple (2) blanks > scan-test.hs:3:9: up to column 12 multiple (3) blanks > scan-test.hs:3:14: up to column 16 multiple (2) blanks > scan-test.hs:3:22: up to column 25 multiple (3) blanks > scan-test.hs:4:4: up to column 12 multiple (8) blanks > scan-test.hs:4:14: up to column 16 multiple (2) blanks > scan-test.hs:4:17: up to column 25 multiple (8) blanks At least you see a regular pattern wrt column position: (12, 16, 25) > I very much prefer the previous indentation over the following version > stripped down by scan - (using the hyphen option): > > instance Eq a => Eq (Maybe a) where > Nothing == Nothing = True > Just x == Just y = x == y > _ == _ = False > > I did not find a way to configure scan to ignore "multiple blanks". > Did I miss it? It isn't yet implemented. Cheers Christian > > Sebastian > > [1]: http://people.cs.uu.nl/andres/lhs2tex/ > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe