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{-
Copyright (C) 2010 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 : Text.Pandoc.UTF8
Copyright : Copyright (C) 2010 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
UTF-8 aware string IO functions that will work with GHC 6.10, 6.12, or 7.
-}
module Text.Pandoc.UTF8 ( readFile
, writeFile
, getContents
, putStr
, putStrLn
, hPutStr
, hPutStrLn
, hGetContents
, toString
, fromString
, toStringLazy
, fromStringLazy
, encodePath
, decodeArg
)
where
import System.IO hiding (readFile, writeFile, getContents,
putStr, putStrLn, hPutStr, hPutStrLn, hGetContents)
#if MIN_VERSION_base(4,6,0)
import Prelude hiding (readFile, writeFile, getContents, putStr, putStrLn)
#else
import Prelude hiding (readFile, writeFile, getContents, putStr, putStrLn,
catch)
#endif
import qualified System.IO as IO
import qualified Data.ByteString.Char8 as B
import qualified Data.ByteString.Lazy as BL
import qualified Data.Text.Encoding as T
import qualified Data.Text as T
import qualified Data.Text.Lazy as TL
import qualified Data.Text.Lazy.Encoding as TL
readFile :: FilePath -> IO String
readFile f = do
h <- openFile (encodePath f) ReadMode
hGetContents h
writeFile :: FilePath -> String -> IO ()
writeFile f s = withFile (encodePath f) WriteMode $ \h -> hPutStr h s
getContents :: IO String
getContents = hGetContents stdin
putStr :: String -> IO ()
putStr s = hPutStr stdout s
putStrLn :: String -> IO ()
putStrLn s = hPutStrLn stdout s
hPutStr :: Handle -> String -> IO ()
hPutStr h s = hSetEncoding h utf8 >> IO.hPutStr h s
hPutStrLn :: Handle -> String -> IO ()
hPutStrLn h s = hSetEncoding h utf8 >> IO.hPutStrLn h s
hGetContents :: Handle -> IO String
hGetContents = fmap toString . B.hGetContents
-- hGetContents h = hSetEncoding h utf8_bom
-- >> hSetNewlineMode h universalNewlineMode
-- >> IO.hGetContents h
-- | Drop BOM (byte order marker) if present at beginning of string.
-- Note that Data.Text converts the BOM to code point FEFF, zero-width
-- no-break space, so if the string begins with this we strip it off.
dropBOM :: String -> String
dropBOM ('\xFEFF':xs) = xs
dropBOM xs = xs
-- | Convert UTF8-encoded ByteString to String, also
-- removing '\r' characters.
toString :: B.ByteString -> String
toString = filter (/='\r') . dropBOM . T.unpack . T.decodeUtf8
fromString :: String -> B.ByteString
fromString = T.encodeUtf8 . T.pack
-- | Convert UTF8-encoded ByteString to String, also
-- removing '\r' characters.
toStringLazy :: BL.ByteString -> String
toStringLazy = filter (/='\r') . dropBOM . TL.unpack . TL.decodeUtf8
fromStringLazy :: String -> BL.ByteString
fromStringLazy = TL.encodeUtf8 . TL.pack
encodePath :: FilePath -> FilePath
decodeArg :: String -> String
#if MIN_VERSION_base(4,4,0)
encodePath = id
decodeArg = id
#else
encodePath = B.unpack . fromString
decodeArg = toString . B.pack
#endif
|
