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{-# LANGUAGE ScopedTypeVariables #-}
{-
Copyright (C) 2009 John MacFarlane <jgm@berkeley.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
module Yst.CSV (readCSVFile)
where
import Yst.Types
import Yst.Util
import Text.CSV
-- Note: ghc >= 6.12 (base >=4.2) supports unicode through iconv
-- So we use System.IO.UTF8 only if we have an earlier version
#if MIN_VERSION_base(4,2,0)
#if !(MIN_VERSION_base(4,6,0))
import Prelude hiding (catch)
#endif
#else
import Prelude hiding (
readFile
#if !(MIN_VERSION_base(4,6,0))
, catch
#endif
)
import System.IO.UTF8
#endif
import Control.Exception (catch, SomeException)
readCSVFile :: FilePath -> IO Node
readCSVFile f = catch (toNode `fmap` readFile f)
(\(e::SomeException) -> do
errorExit 11 ("Error parsing " ++ f ++ ": " ++ show e)
return NNil)
where toNode = csvToNode . parseCSV' f . stripBlanks . filter (/='\r')
parseCSV' :: FilePath -> String -> CSV
parseCSV' f s = case parseCSV f s of
Left e -> error $ "Error parsing " ++ f ++ ": " ++ show e
Right c -> c
csvToNode :: CSV -> Node
csvToNode [] = NNil
csvToNode (fieldNames : records) =
NList $ map (\record -> NMap $ zip fieldNames $ map fieldToNode record) records
fieldToNode :: Field -> Node
fieldToNode s =
case parseAsDate s of
Nothing -> NString s
Just d -> NDate d