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{-
Copyright (C) 2010-2016 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) 2010-2016 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 qualified Data.ByteString.Char8 as B
import qualified Data.ByteString.Lazy as BL
import qualified Data.Text as T
import qualified Data.Text.Encoding as T
import qualified Data.Text.Lazy as TL
import qualified Data.Text.Lazy.Encoding as TL
import Prelude hiding (getContents, putStr, putStrLn, readFile, writeFile)
import System.IO hiding (getContents, hGetContents, hPutStr, hPutStrLn, putStr,
putStrLn, readFile, writeFile)
import qualified System.IO as IO
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
filterCRs :: String -> String
filterCRs ('\r':'\n':xs) = '\n': filterCRs xs
filterCRs ('\r':xs) = '\n' : filterCRs xs
filterCRs (x:xs) = x : filterCRs xs
filterCRs [] = []
-- | Convert UTF8-encoded ByteString to String, also
-- removing '\r' characters.
toString :: B.ByteString -> String
toString = filterCRs . 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 = filterCRs . dropBOM . TL.unpack . TL.decodeUtf8
fromStringLazy :: String -> BL.ByteString
fromStringLazy = TL.encodeUtf8 . TL.pack
encodePath :: FilePath -> FilePath
encodePath = id
decodeArg :: String -> String
decodeArg = id
|
