{-# LANGUAGE CPP,TemplateHaskell,DeriveDataTypeable #-}
{- | This module implements Windows Codepage number 1254 which encodes the turkish language.
     See <http://en.wikipedia.org/wiki/CP1254> for more information.
module Data.Encoding.CP1254
	(CP1254(..)) where

import Data.Array ((!),Array)
import Data.Word (Word8)
import Data.ByteString (all)
import Data.Map (Map,lookup,member)
import Data.Encoding.Base
import Prelude hiding (lookup,all)
import Control.Exception (throwDyn)
import Data.Typeable

data CP1254 = CP1254 deriving (Eq,Show,Typeable)

instance Encoding CP1254 where
	encode _ = encodeSinglebyte (\c -> case lookup c encodeMap of
		Just v -> v
		Nothing -> throwDyn (HasNoRepresentation c))
	encodable _ c = member c encodeMap
	decode _ = decodeSinglebyte (decodeArr!)
	decodable _ = all (\w -> decodeArr!w /= '\xFFFD')

decodeArr :: Array Word8 Char
#ifndef __HADDOCK__
decodeArr = $(decodingArray "CP1254.TXT")

encodeMap :: Map Char Word8
#ifndef __HADDOCK__
encodeMap =  $(encodingMap "CP1254.TXT")