8b16078e5e
Characters which should be encoded in [128..255] range were encoded into [0..127] range. ** END OF DESCRIPTION*** Place the long patch description above the ***END OF DESCRIPTION*** marker. The first line of this file will be the patch name. This patch contains the following changes: M ./Data/Encoding/KOI8R.hs -1 +1 M ./Data/Encoding/KOI8U.hs -1 +1 darcs-hash:20090118232224-7ba7e-c685a571f6ac9a9ca78725a80040e842f4a7e5a7
66 lines
2.5 KiB
Haskell
66 lines
2.5 KiB
Haskell
{-# LANGUAGE DeriveDataTypeable #-}
|
|
{- | This module implements KOI8-R encoding which covers the russian and bulgarian alphabet.
|
|
See <http://en.wikipedia.org/wiki/KOI8-R> for more information.
|
|
-}
|
|
module Data.Encoding.KOI8R
|
|
(KOI8R(..)) where
|
|
|
|
import Control.Exception (throwDyn)
|
|
import Data.Array.Unboxed
|
|
import Data.Char (ord,chr)
|
|
import qualified Data.ByteString.Lazy as Lazy
|
|
import Data.Map hiding (map,(!))
|
|
import Data.Word
|
|
import Prelude hiding (lookup)
|
|
import Data.Typeable
|
|
|
|
import Data.Encoding.Base
|
|
|
|
data KOI8R = KOI8R deriving (Eq,Show,Typeable)
|
|
|
|
koi8rArr :: UArray Word8 Char
|
|
koi8rArr = listArray (128,255) koi8rList
|
|
|
|
koi8rMap :: Map Char Word8
|
|
koi8rMap = fromList (zip koi8rList [128..])
|
|
|
|
koi8rList :: [Char]
|
|
koi8rList =
|
|
['\x2500','\x2502','\x250c','\x2510','\x2514','\x2518','\x251c','\x2524'
|
|
,'\x252c','\x2534','\x253c','\x2580','\x2584','\x2588','\x258c','\x2590'
|
|
,'\x2591','\x2592','\x2593','\x2320','\x25a0','\x2219','\x221a','\x2248'
|
|
,'\x2264','\x2265','\x00a0','\x2321','\x00b0','\x00b2','\x00b7','\x00f7'
|
|
,'\x2550','\x2551','\x2552','\x0451','\x2553','\x2554','\x2555','\x2556'
|
|
,'\x2557','\x2558','\x2559','\x255a','\x255b','\x255c','\x255d','\x255e'
|
|
,'\x255f','\x2560','\x2561','\x0401','\x2562','\x2563','\x2564','\x2565'
|
|
,'\x2566','\x2567','\x2568','\x2569','\x256a','\x256b','\x256c','\x00a9'
|
|
,'\x044e','\x0430','\x0431','\x0446','\x0434','\x0435','\x0444','\x0433'
|
|
,'\x0445','\x0438','\x0439','\x043a','\x043b','\x043c','\x043d','\x043e'
|
|
,'\x043f','\x044f','\x0440','\x0441','\x0442','\x0443','\x0436','\x0432'
|
|
,'\x044c','\x044b','\x0437','\x0448','\x044d','\x0449','\x0447','\x044a'
|
|
,'\x042e','\x0410','\x0411','\x0426','\x0414','\x0415','\x0424','\x0413'
|
|
,'\x0425','\x0418','\x0419','\x041a','\x041b','\x041c','\x041d','\x041e'
|
|
,'\x041f','\x042f','\x0420','\x0421','\x0422','\x0423','\x0416','\x0412'
|
|
,'\x042c','\x042b','\x0417','\x0428','\x042d','\x0429','\x0427','\x042a'
|
|
]
|
|
|
|
koi8rDecode :: Word8 -> Char
|
|
koi8rDecode ch
|
|
| ch < 128 = chr $ fromIntegral ch
|
|
| otherwise = koi8rArr!ch
|
|
|
|
koi8rEncode :: Char -> Word8
|
|
koi8rEncode ch
|
|
| ch < '\128' = fromIntegral $ ord ch
|
|
| otherwise = case lookup ch koi8rMap of
|
|
Just w -> w
|
|
Nothing -> throwDyn (HasNoRepresentation ch)
|
|
|
|
instance Encoding KOI8R where
|
|
encode _ = encodeSinglebyte koi8rEncode
|
|
encodeLazy _ = encodeSinglebyteLazy koi8rEncode
|
|
encodable _ c = (c < '\128') || (member c koi8rMap)
|
|
decode _ = decodeSinglebyte koi8rDecode
|
|
decodeLazy _ str = concatMap (decodeSinglebyte koi8rDecode) (Lazy.toChunks str)
|
|
decodable _ = const True
|