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49 lines
1.7 KiB
Haskell
49 lines
1.7 KiB
Haskell
module Arabic where
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mkArabic :: String -> String
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mkArabic = reverse . unwords . (map mkArabicWord) . words
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--- reverse : assumes everything's on same line
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type ArabicChar = Char
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mkArabicWord :: String -> [ArabicChar]
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mkArabicWord = map mkArabicChar . getLetterPos
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getLetterPos :: String -> [(Char,Int)]
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getLetterPos [] = []
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getLetterPos ('I':cs) = ('*',7) : getLetterPos cs -- 0xfe80
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getLetterPos ('O':cs) = ('*',8) : getIn cs -- 0xfe8b
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getLetterPos ('l':'a':cs) = ('*',5) : getLetterPos cs -- 0xfefb
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getLetterPos [c] = [(c,1)] -- 1=isolated
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getLetterPos (c:cs) | isReduced c = (c,1) : getLetterPos cs
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getLetterPos (c:cs) = (c,3) : getIn cs -- 3=initial
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getIn [] = []
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getIn ('I':cs) = ('*',7) : getLetterPos cs -- 0xfe80
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getIn ('O':cs) = ('*',9) : getIn cs -- 0xfe8c
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getIn ('l':'a':cs) = ('*',6) : getLetterPos cs -- 0xfefc
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getIn [c] = [(c,2)] -- 2=final
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getIn (c:cs) | isReduced c = (c,2) : getLetterPos cs
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getIn (c:cs) = (c,4) : getIn cs -- 4=medial
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isReduced :: Char -> Bool
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isReduced c = c `elem` "UuWiYOaAdVrzwj"
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mkArabicChar ('*',p) | p > 4 && p < 10 =
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(map toEnum [0xfefb,0xfefc,0xfe80,0xfe8b,0xfe8c]) !! (p-5)
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mkArabicChar cp@(c,p) = case lookup c cc of Just c' -> (c' !! (p-1)) ; _ -> c
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where
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cc = mkArabicTab allArabicCodes allArabic
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mkArabicTab (c:cs) as = (c,as1) : mkArabicTab cs as2 where
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(as1,as2) = if isReduced c then splitAt 2 as else splitAt 4 as
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mkArabicTab [] _ = []
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allArabicCodes = "UuWiYOabAtvgHCdVrzscSDTZoxfqklmnhwjy"
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allArabic :: String
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allArabic = (map toEnum [0xfe81 .. 0xfef4]) -- I=0xfe80
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