[Haskell-cafe] memory needed for SAX parsing XML
daniil.elovkov at googlemail.com
Mon Apr 19 06:01:27 EDT 2010
I'm trying to process an xml file with as little footprint as possible.
SAX is alright for my case, and I think that's the lightest way
possible. So, I'm looking at HaXml.SAX
I'm surprised to see that it takes about 56-60 MB of ram. This seems
constant relative to xml file size, which is expected. Only slightly
depends on it as I recursively traverse the list of sax events. But it
seems like too much.
The size of the file is from 1MB to 20MB.
The code is something like this
main = do
(fn:_) <- getArgs
h <- openFile fn ReadMode
c <- hGetContents h
let out = proc $ fst $ saxParse fn c
-- 'f' is tail-recursive
-- 'i' is used only to ensure that the list is completely traversed
proc es = show $ f es 0
where f :: [SaxElement] -> Int -> Int
f (SaxElementOpen name _ : rest) i = f rest i
f (_ : rest) i = f rest i
f  i = i
Thanks for you thoughts!
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