{-# LANGUAGE CPP,TemplateHaskell,DeriveDataTypeable #-}
{- | This module implements Windows Codepage number 1250 which encodes languages that use latin script.
     See <http://en.wikipedia.org/wiki/CP1250> for more information.
module Data.Encoding.CP1250
	(CP1250(..)) 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 CP1250 = CP1250 deriving (Eq,Show,Typeable)

instance Encoding CP1250 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 "CP1250.TXT")

encodeMap :: Map Char Word8
#ifndef __HADDOCK__
encodeMap =  $(encodingMap "CP1250.TXT")