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This is an extract of a larger literate Haskell file for testing
SLOCCount. It should have 21 lines of code.
This dumps the tree in dot format, which is very handy for visualizing
the trees.
> dotTree name t = "digraph " ++ filter dotChars name ++ " { " ++ (dotTree' t 0) ++ " }"
> dotTree' Empty _ = ""
> dotTree' t i | is_leaf t = "n"++(show i)++" [label=\""++(show $ x_span t)++
> "\",shape=box]; "
> | otherwise = "n"++(show i)++" [label=\""++(show $ x_span t)++"\"]; " ++
> "n"++(show i)++" -> n"++(show (2*i+1))++"; "++
> "n"++(show i)++" -> n"++(show (2*i+2))++"; "++
> dotTree' (left t) (2*i+1) ++
> dotTree' (right t) (2*i+2)
> where is_leaf Node { left = Empty, right = Empty } = True
> is_leaf _ = False
> {- this is a comment
foo bar baz
> that
> spans literate blocks -}
> dotChars '.' = False
> dotChars '/' = False
> dotChars _ = True
These functions fill in the monotonically increasing index values for
the lines in the finite map. They also do appropriate things to combine
the world values.
> idxList [] n = []
> idxList (x:xs) n = (x {idx=n}):(idxList xs (n+1))
> idxFM' fm (x,k) = addToFM (delFromFM fm k) k (y {idx=toInteger x})
> where y = case lookupFM fm k of
> Just foo -> foo
> Nothing -> error $ "No such key: " ++ show k
> idxFM fm = foldl idxFM' fm (zip [1..sizeFM fm] $ keysFM fm)
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