Harald's new codings.

src/GF/Text/Ethiopic.hs

@@ -0,0 +1,57 @@
+module Ethiopic where
+
+mkEthiopic :: String -> String
+mkEthiopic = digraphWordToUnicode . adHocToDigraphWord
+
+-- mkEthiopic :: String -> String
+-- mkEthiopic = reverse . unwords . (map (digraphWordToUnicode . adHocToDigraphWord)) . words
+--- reverse : assumes everything's on same line
+
+adHocToDigraphWord :: String -> [(Char, Int)]
+adHocToDigraphWord str = case str of
+  [] -> []
+  '<' : cs -> ('<', -1) : spoolMarkup cs
+  c1 : cs | isVowel c1 -> (')', vowelOrder c1) : adHocToDigraphWord cs
+  -- c1 isn't a vowel
+  c1 : cs | not (elem c1 allEthiopicCodes) -> (c1, -1) : adHocToDigraphWord cs
+  c1 : c2 : cs | isVowel c2 -> (c1, vowelOrder c2) : adHocToDigraphWord cs
+  c1 : cs -> (c1, 5) : adHocToDigraphWord cs 
+  
+spoolMarkup :: String -> [(Char, Int)]
+spoolMarkup s = case s of
+  -- [] -> [] -- Shouldn't happen
+  '>' : cs -> ('>', -1) : adHocToDigraphWord cs  
+  c1 : cs -> (c1, -1) : spoolMarkup cs
+    
+isVowel x = elem x "AäuiïaeoI"
+
+vowelOrder :: Char -> Int
+vowelOrder x = case x of 
+  'A' -> 0
+  'ä' -> 0
+  'u' -> 1
+  'i' -> 2
+  'a' -> 3
+  'e' -> 4
+  'I' -> 5
+  'ï' -> 5
+  'o' -> 6
+  c   -> 5 -- vowelless 
+
+digraphWordToUnicode = map digraphToUnicode
+
+digraphToUnicode :: (Char, Int) -> Char
+-- digraphToUnicode (c1, c2) = c1
+ 
+digraphToUnicode (c1, -1) = c1 
+digraphToUnicode (c1, c2) = toEnum (0x1200 + c2 + 8*case lookup c1 cc of Just c' -> c') 
+    where 
+      cc = zip allEthiopicCodes allEthiopic
+
+allEthiopic :: [Int]
+allEthiopic = [0 .. 44] -- x 8
+
+allEthiopicCodes = "hlHmLrs$KQ__bBtcxXnN)kW__w(zZyd_jgG_TCPSLfp"
+
+-- Q = kW, X = xW, W = kW, G = gW  
+