Founding the newly structured GF2.0 cvs archive.

src/GF/Text/UTF8.hs

@@ -0,0 +1,35 @@
+module UTF8 where
+
+-- From the Char module supplied with HBC.
+-- code by Thomas Hallgren (Jul 10 1999)
+
+-- Take a Unicode string and encode it as a string
+-- with the UTF8 method.
+decodeUTF8 :: String -> String
+decodeUTF8 "" = ""
+decodeUTF8 (c:cs) | c < '\x80' = c : decodeUTF8 cs
+decodeUTF8 (c:c':cs) | '\xc0' <= c  && c  <= '\xdf' && 
+		      '\x80' <= c' && c' <= '\xbf' =
+	toEnum ((fromEnum c `mod` 0x20) * 0x40 + fromEnum c' `mod` 0x40) : decodeUTF8 cs
+decodeUTF8 (c:c':c'':cs) | '\xe0' <= c   && c   <= '\xef' && 
+		          '\x80' <= c'  && c'  <= '\xbf' &&
+		          '\x80' <= c'' && c'' <= '\xbf' =
+	toEnum ((fromEnum c `mod` 0x10 * 0x1000) + (fromEnum c' `mod` 0x40) * 0x40 + fromEnum c'' `mod` 0x40) : decodeUTF8 cs
+decodeUTF8 _ = error "UniChar.decodeUTF8: bad data"
+
+encodeUTF8 :: String -> String
+encodeUTF8 "" = ""
+encodeUTF8 (c:cs) =
+	if c > '\x0000' && c < '\x0080' then
+	    c : encodeUTF8 cs
+	else if c < toEnum 0x0800 then
+	    let i = fromEnum c
+	    in  toEnum (0xc0 + i `div` 0x40) : 
+	        toEnum (0x80 + i `mod` 0x40) : 
+		encodeUTF8 cs
+	else
+	    let i = fromEnum c
+	    in  toEnum (0xe0 + i `div` 0x1000) : 
+	        toEnum (0x80 + (i `mod` 0x1000) `div` 0x40) : 
+		toEnum (0x80 + i `mod` 0x40) : 
+		encodeUTF8 cs