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|
----------------------------------------------------------------------
-- |
-- Module : Thai
-- Maintainer : (Maintainer)
-- Stability : (experimental)
-- Portability : (portable)
--
--
-- Thai transliteration and other alphabet information.
-----------------------------------------------------------------------------
-- AR 27/12/2006. Execute test2 to see the transliteration table.
module GF.Text.Thai (mkThai) where
import qualified Data.Map as Map
import Data.Char
-- for testing
import GF.Text.UTF8
import Data.List
mkThai :: String -> String
mkThai = concat . map mkThaiWord . words
type ThaiChar = Char
mkThaiWord :: String -> [ThaiChar]
mkThaiWord = map (toEnum . mkThaiChar) . unchar . snd . pronAndOrth
mkThaiChar :: String -> Int
mkThaiChar c = maybe 0 id $ Map.lookup c thaiMap
thaiMap :: Map.Map String Int
thaiMap = Map.fromList $ zip allThaiTrans allThaiCodes
-- convert all string literals in a text
thaiStrings :: String -> String
thaiStrings s = case s of
'"':cs -> let (t,_:r) = span (/='"') cs in
'"':mkThai t ++ "\"" ++ thaiStrings r
c:cs -> c:thaiStrings cs
_ -> s
-- each character is either [letter] or [letter+nonletter]
unchar :: String -> [String]
unchar s = case s of
c:d:cs
| isAlpha d -> [c] : unchar (d:cs)
| d == '?' -> unchar cs -- use "o?" to represent implicit 'o'
| otherwise -> [c,d] : unchar cs
[_] -> [s]
_ -> []
-- you can prefix transliteration by irregular phonology in []
pronAndOrth :: String -> (Maybe String, String)
pronAndOrth s = case s of
'[':cs -> case span (/=']') cs of
(p,_:o) -> (Just p,o)
_ -> (Nothing,s)
_ -> (Nothing,s)
allThaiTrans :: [String]
allThaiTrans = words $
"- k k1 - k2 - k3 g c c1 c2 s c3 y d t " ++
"t1 t2 t3 n d' t' t4 t5 t6 n b p p1 f p2 f' " ++
"p3 m y' r - l - w s' r' s- h l' O h' - " ++
"a a. a: a+ i i: v v: u u: - - - - - - " ++
"e e' o: a% a& L R M T1 T2 T3 T4 - - - - " ++
"N0 N1 N2 N3 N4 N5 N6 N7 N8 N9 - - - - - - "
allThaiCodes :: [Int]
allThaiCodes = [0x0e00 .. 0x0e7f]
-- derive the pronunciation of a syllable
pronSyll :: [Int] -> String
pronSyll s = cons1 ++ voc ++ cons2 where
voc = toned tone $ pronThaiChar vo
cons1 = concatMap pronThaiChar co1 ----
cons2 = mkThaiPron $ unwords $ map recodeThai co2 -- takes care of final ----
(vo,cc@(co1,co2)) = case s of
c:cs | initVowel c -> (c,getCons cs)
c1:c:c2 | internVowel c -> (c,([c1],getFinal c2))
c1:0x0e2d:c2 -> (0x0e42,([c1],getFinal c2))
c0:c1:c:c2 | cluster c0 c1 && internVowel c -> (c,([c0,c1],getFinal c2))
c0:c1:0x0e2d:c2 | cluster c0 c1 -> (0x0e42,([c0,c1],getFinal c2))
_ -> (0x0e42,getCons s) ---- "o"
getCons cs = case cs of
c0:c1:c2 | cluster c1 c1 -> ([c0,c1],getFinal c2)
c:c2 -> ([c],getFinal c2)
getFinal = snd . getToneFinal
toneMark = fst . getToneFinal
getToneFinal c = case c of
[ _,0x0e4c] -> ([], []) -- killer
[t,_,0x0e4c] -> ([t],[]) -- killer
_ -> splitAt (length c - 1) c
initVowel c = 0x0e40 <= c && c <= 0x0e44
internVowel c = 0x0e30 <= c && c <= 0x0e39
cluster c0 c1 =
c0 == 0x0e2b -- h
|| c1 == 0x0e23 -- r
|| c1 == 0x0e25 -- l
|| c1 == 0x0e27 -- w
classC = case co1 of
_ -> "L" ----
lengthV = case vo of
_ -> False ----
liveness = case co2 of
_ -> False ----
tone = case (classC,lengthV,liveness,toneMark) of
_ -> ""
toned t v = t ++ v ----
-- [0x0e00 .. 0x0e7f]
-- to test
test1 = testThai "k2wa:mrak"
test2 = putStrLn $ thaiTable
test3 = do
writeFile "thai.html" "<html><body><pre>"
appendFile "thai.html" thaiTable
appendFile "thai.html" "</pre></body></html>"
testThai :: String -> IO ()
testThai s = do
putStrLn $ encodeUTF8 $ mkThai s
putStrLn $ unwords $ map mkThaiPron $ words s
thaiFile :: FilePath -> Maybe FilePath -> IO ()
thaiFile f mo = do
s <- readFile f
let put = maybe putStr writeFile mo
put $ encodeUTF8 $ thaiStrings s
mkThaiPron s = case fst $ pronAndOrth s of
Just p -> p
_ -> concat $ render $ unchar s
where
render s = case s of
[c] -> finalThai c : []
c:cs -> pronThai c : render cs
_ -> []
finalThai c = maybe c return (Map.lookup c thaiFinalMap)
thaiFinalMap = Map.fromList $ zip allThaiTrans finals
classThai c = maybe c return (Map.lookup c thaiClassMap)
thaiClassMap = Map.fromList $ zip allThaiTrans heights
thaiTable :: String
thaiTable = unlines [
"\t" ++
hex c ++ "\t" ++
encodeUTF8 (showThai s) ++ "\t" ++
s ++ "\t" ++
pronThai s ++ "\t" ++
[f] ++ "\t" ++
[q] ++ "\t"
|
(c,q,f,s) <- zip4 allThaiCodes heights finals allThaiTrans
]
showThai s = case s of
"-" -> "-"
--- v:_ | elem v "ivu" -> map (toEnum . mkThaiChar) ["O",s]
_ -> [toEnum $ mkThaiChar s]
pronThaiChar = pronThai . recodeThai
recodeThai c = allThaiTrans !! (c - 0x0e00)
pronThai s = case s of
[c,p]
| c == 'N' && isDigit p -> [p]
| c == 'T' && isDigit p -> ['\'',p]
| isDigit p -> c:"h"
| p==':' -> c:[c]
| elem p "%&" -> c:"y"
| p=='+' -> c:"m"
| s == "e'" -> "ä"
| otherwise -> [c]
[c] | isUpper c -> "" --- O
_ -> s
hex = map hx . reverse . digs where
digs 0 = [0]
digs n = n `mod` 16 : digs (n `div` 16)
hx d = "0123456789ABCDEF" !! d
heights :: String
finals :: String
heights =
" MHHLLLLMHLLLLMMHLLLMMHLLLMMHHLLLLLL-L-LHHHHLML" ++ replicate 99 ' '
finals =
" kkkkkkgt-tt-ntttttntttttnpp--pppmyn-n-wttt-n--" ++ replicate 99 ' '
|
