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 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 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? Sebastian [1]: http://people.cs.uu.nl/andres/lhs2tex/ -- Underestimating the novelty of the future is a time-honored tradition. (D.G.)