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|
----------------------------------------------------------------------
-- |
-- Module : Arabic
-- Maintainer : (Maintainer)
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/02/18 19:21:13 $
-- > CVS $Author: peb $
-- > CVS $Revision: 1.5 $
--
-- (Description of the module)
-----------------------------------------------------------------------------
module Arabic (mkArabic) where
mkArabic :: String -> String
mkArabic = unwords . (map mkArabicWord) . words
----mkArabic = reverse . unwords . (map mkArabicWord) . words
--- reverse : assumes everything's on same line
type ArabicChar = Char
mkArabicWord :: String -> [ArabicChar]
mkArabicWord = map mkArabicChar . getLetterPos
getLetterPos :: String -> [(Char,Int)]
getLetterPos [] = []
getLetterPos ('I':cs) = ('*',7) : getLetterPos cs -- 0xfe80
getLetterPos ('O':cs) = ('*',8) : getIn cs -- 0xfe8b
getLetterPos ('l':'a':cs) = ('*',5) : getLetterPos cs -- 0xfefb
getLetterPos [c] = [(c,1)] -- 1=isolated
getLetterPos (c:cs) | isReduced c = (c,1) : getLetterPos cs
getLetterPos (c:cs) = (c,3) : getIn cs -- 3=initial
getIn [] = []
getIn ('I':cs) = ('*',7) : getLetterPos cs -- 0xfe80
getIn ('O':cs) = ('*',9) : getIn cs -- 0xfe8c
getIn ('l':'a':cs) = ('*',6) : getLetterPos cs -- 0xfefc
getIn [c] = [(c,2)] -- 2=final
getIn (c:cs) | isReduced c = (c,2) : getLetterPos cs
getIn (c:cs) = (c,4) : getIn cs -- 4=medial
isReduced :: Char -> Bool
isReduced c = c `elem` "UuWiYOaAdVrzwj"
mkArabicChar ('*',p) | p > 4 && p < 10 =
(map toEnum [0xfefb,0xfefc,0xfe80,0xfe8b,0xfe8c]) !! (p-5)
mkArabicChar cp@(c,p) = case lookup c cc of Just c' -> (c' !! (p-1)) ; _ -> c
where
cc = mkArabicTab allArabicCodes allArabic
mkArabicTab (c:cs) as = (c,as1) : mkArabicTab cs as2 where
(as1,as2) = if isReduced c then splitAt 2 as else splitAt 4 as
mkArabicTab [] _ = []
allArabicCodes = "UuWiYOabAtvgHCdVrzscSDTZoxfqklmnhwjy"
allArabic :: String
allArabic = (map toEnum [0xfe81 .. 0xfef4]) -- I=0xfe80
|
