L.S.,
Reading and writing a comma seperated datafile doesn't have to be that
complicated; the following is an easy way to read a CSV file into a list
of tuples and display the list on screen:
displayTuples =
do
csvData <- readFile "data.csv"
putStrLn $ unlines $ map (show . readTuple) $ lines csvData
readTuple :: String -> (Int, Bool, String)
readTuple line = read tuple
where tuple = '(' : line ++ ")"
If the file "data.csv" contains the following:
1, True, "Festina lente"
2, False, "Carpe diem"
displayTuples displays:
(1,True,"Festina lente")
(2,False,"Carpe diem")
Writing a list of tuples to a CSV file is even simpler:
writeTuples file tuples = writeFile file $ unlines $ map (tail . init .
show) tuples
The call:
writeTuples "new.csv" [(1, 'a'), (2, 'b')]
results in a file containg:
1,'a'
2,'b'
(without the leading spaces)
Met vriendelijke groet,
Henk-Jan van Tuyl
--
http://Van.Tuyl.eu/
--
On Tue, 22 Aug 2006 11:19:35 +0200, Tamas K Papp <[EMAIL PROTECTED]>
wrote:
Hi,
Now that I have read the tutorials, I think that the best way to learn
Haskell would be to use the language and write something simple yet
useful. I noticed that Haskell lacks a module for reading/writing csv
(comma separated value) files, so I thought I could implement that.
Questions:
1. Please tell me if you know of a csv module, because then I would do
something else.
2. I am looking for a parser, but I don't know Haskell parsers. Is
Parsec a good choice?
Thanks,
Tamas
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