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98 lines
3.5 KiB
Haskell
98 lines
3.5 KiB
Haskell
----------------------------------------------------------------------
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-- |
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-- Module : Devanagari
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-- Maintainer : (Maintainer)
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-- Stability : (stable)
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-- Portability : (portable)
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--
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-- > CVS $Date: 2005/04/21 16:23:34 $
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-- > CVS $Author: bringert $
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-- > CVS $Revision: 1.5 $
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--
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-- (Description of the module)
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-----------------------------------------------------------------------------
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module GF.Text.Devanagari (mkDevanagari) where
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mkDevanagari :: String -> String
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mkDevanagari = digraphWordToUnicode . adHocToDigraphWord
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adHocToDigraphWord :: String -> [(Char, Char)]
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adHocToDigraphWord str = case str of
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[] -> []
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'<' : cs -> ('\\', '<') : spoolMarkup cs
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' ' : cs -> ('\\', ' ') : adHocToDigraphWord cs -- skip space
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-- if c1 is a vowel
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-- Two of the same vowel => lengthening
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c1 : c2 : cs | c1 == c2 && isVowel c1 -> (cap c1, ':') : adHocToDigraphWord cs
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-- digraphed or long vowel
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c1 : c2 : cs | isVowel c1 && isVowel c2 -> (cap c1, cap c2) : adHocToDigraphWord cs
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c1 : cs | isVowel c1 -> (' ', cap c1) : adHocToDigraphWord cs
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-- c1 isn't a vowel
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-- c1 : 'a' : [] -> [(' ', c1)] -- a inherent
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-- c1 : c2 : [] | isVowel c2 -> (' ', c1) : [(' ', c2)]
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-- c1 is aspirated
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c1 : 'H' : c2 : c3 : cs | c2 == c3 && isVowel c2 ->
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(c1, 'H') : (c2, ':') : adHocToDigraphWord cs
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c1 : 'H' : c2 : c3 : cs | isVowel c2 && isVowel c3 ->
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(c1, 'H') : (c2, c3) : adHocToDigraphWord cs
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c1 : 'H' : 'a' : cs -> (c1, 'H') : adHocToDigraphWord cs -- a inherent
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c1 : 'H' : c2 : cs | isVowel c2 -> (c1, 'H') : (' ', c2) : adHocToDigraphWord cs
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-- not vowelless at EOW
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c1 : 'H' : ' ' : cs -> (c1, 'H') : ('\\', ' ') : adHocToDigraphWord cs
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c1 : 'H' : [] -> [(c1, 'H')]
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c1 : 'H' : cs -> (c1, 'H') : (' ', '^') : adHocToDigraphWord cs -- vowelless
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-- c1 unasp.
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c1 : c2 : c3 : cs | c2 == c3 && isVowel c2 -> (' ', c1) : (c2, ':') : adHocToDigraphWord cs
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c1 : c2 : c3 : cs | isVowel c2 && isVowel c3 -> (' ', c1) : (c2, c3) : adHocToDigraphWord cs
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c1 : 'a' : cs -> (' ', c1) : adHocToDigraphWord cs -- a inherent
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c1 : c2 : cs | isVowel c2 -> (' ', c1) : (' ', c2) : adHocToDigraphWord cs
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-- not vowelless at EOW
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c1 : ' ' : cs -> (' ', c1) : ('\\', ' '): adHocToDigraphWord cs
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c1 : [] -> [(' ', c1)]
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'M' : cs -> (' ', 'M') : adHocToDigraphWord cs -- vowelless but no vowelless sign for anusvara
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c1 : cs -> (' ', c1) : (' ', '^') : adHocToDigraphWord cs -- vowelless
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isVowel x = elem x "aeiou:"
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cap :: Char -> Char
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cap x = case x of
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'a' -> 'A'
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'e' -> 'E'
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'i' -> 'I'
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'o' -> 'O'
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'u' -> 'U'
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c -> c
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spoolMarkup :: String -> [(Char, Char)]
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spoolMarkup s = case s of
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-- [] -> [] -- Shouldn't happen
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'>' : cs -> ('\\', '>') : adHocToDigraphWord cs
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c1 : cs -> ('\\', c1) : spoolMarkup cs
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digraphWordToUnicode :: [(Char, Char)] -> String
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digraphWordToUnicode = map digraphToUnicode
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digraphToUnicode :: (Char, Char) -> Char
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digraphToUnicode (c1, c2) = case lookup (c1, c2) cc of Just c' -> c' ; _ -> c2
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where
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cc = zip allDevanagariCodes allDevanagari
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digraphedDevanagari = " ~ M ;__ AA: II: UU:RoLoEvE~ EE:AvA~ OAU kkH ggHNG ccH jjH \241 TTH DDH N ttH ddH nn. ppH bbH m y rr. l LL. v \231 S s h____ .-Sa: ii: uu:ror:eve~ eaiava~ oau ^____OM | -dddu______ Q X G zD.RH fy.R:L:mrmR#I#d#0#1#2#3#4#5#6#7#8#9#o"
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allDevanagariCodes :: [(Char, Char)]
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allDevanagariCodes = mkPairs digraphedDevanagari
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allDevanagari :: String
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allDevanagari = (map toEnum [0x0901 .. 0x0970])
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mkPairs :: String -> [(Char, Char)]
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mkPairs str = case str of
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[] -> []
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c1 : c2 : cs -> (c1, c2) : mkPairs cs
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