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|
{-# LANGUAGE DeriveDataTypeable, EmptyDataDecls, ForeignFunctionInterface #-}
-- |
-- Module : Data.Text.ICU.Convert.Internal
-- Copyright : (c) Bryan O'Sullivan 2009
--
-- License : BSD-style
-- Maintainer : bos@serpentine.com
-- Stability : experimental
-- Portability : GHC
--
-- Low-level character set types and functions.
module Data.Text.ICU.Convert.Internal
(
Converter(..)
, UConverter
, getName
, withConverter
) where
import Data.Text.ICU.Error.Internal (UErrorCode, handleError)
import Data.Typeable (Typeable)
import Foreign.C.String (CString, peekCString)
import Foreign.ForeignPtr (ForeignPtr, withForeignPtr)
import Foreign.Ptr (Ptr)
import System.IO.Unsafe (unsafePerformIO)
data UConverter
-- | Character set converter type. /Note/: this structure is not
-- thread safe. It is /not/ safe to use value of this type
-- simultaneously from multiple threads.
data Converter = Converter {-# UNPACK #-} !(ForeignPtr UConverter)
deriving (Eq, Typeable)
instance Show Converter where
show c = "Converter " ++ show (getName c)
withConverter :: Converter -> (Ptr UConverter -> IO a) -> IO a
{-# INLINE withConverter #-}
withConverter (Converter cnv) action = withForeignPtr cnv action
-- | Gets the internal, canonical name of the converter.
getName :: Converter -> String
getName cnv = unsafePerformIO .
withConverter cnv $ \ptr ->
peekCString =<< handleError (ucnv_getName ptr)
foreign import ccall unsafe "hs_text_icu.h __hs_ucnv_getName" ucnv_getName
:: Ptr UConverter -> Ptr UErrorCode -> IO CString
|
