From a0973d09a5b4f6a08b35c0b3de371c895d7d847a Mon Sep 17 00:00:00 2001
From: Alec Theriault <alec.theriault@gmail.com>
Date: Thu, 31 Jan 2019 15:37:58 -0800
Subject: Remove `Documentation.Haddock.Utf8`

The circumstances under which this module appeared are completely gone.
The Hyperlinker backend no longer needs this module (it uses the more
efficient `Encoding` module from `ghc`).

Why no deprecation? Because this module really shouldn't exist!

  - It isn't used in `haddock-library`/`haddock-api` anymore
  - It was copy pasted directly from `utf8-string`
  - Folks seeking a boot-lib only solution can use `ghc`'s `Encoding`
---
 haddock-library/src/Documentation/Haddock/Utf8.hs | 74 -----------------------
 1 file changed, 74 deletions(-)
 delete mode 100644 haddock-library/src/Documentation/Haddock/Utf8.hs

(limited to 'haddock-library/src/Documentation')

diff --git a/haddock-library/src/Documentation/Haddock/Utf8.hs b/haddock-library/src/Documentation/Haddock/Utf8.hs
deleted file mode 100644
index 3f75e53b..00000000
--- a/haddock-library/src/Documentation/Haddock/Utf8.hs
+++ /dev/null
@@ -1,74 +0,0 @@
-module Documentation.Haddock.Utf8 (encodeUtf8, decodeUtf8) where
-import           Data.Bits ((.|.), (.&.), shiftL, shiftR)
-import qualified Data.ByteString as BS
-import           Data.Char (chr, ord)
-import           Data.Word (Word8)
-
--- | Helper that encodes and packs a 'String' into a 'BS.ByteString'
-encodeUtf8 :: String -> BS.ByteString
-encodeUtf8 = BS.pack . encode
-
--- | Helper that unpacks and decodes a 'BS.ByteString' into a 'String'
-decodeUtf8 :: BS.ByteString -> String
-decodeUtf8 = decode . BS.unpack
-
--- Copy/pasted functions from Codec.Binary.UTF8.String for encoding/decoding
--- | Character to use when 'encode' or 'decode' fail for a byte.
-replacementCharacter :: Char
-replacementCharacter = '\xfffd'
-
--- | Encode a Haskell String to a list of Word8 values, in UTF8 format.
-encode :: String -> [Word8]
-encode = concatMap (map fromIntegral . go . ord)
- where
-  go oc
-   | oc <= 0x7f       = [oc]
-
-   | oc <= 0x7ff      = [ 0xc0 + (oc `shiftR` 6)
-                        , 0x80 + oc .&. 0x3f
-                        ]
-
-   | oc <= 0xffff     = [ 0xe0 + (oc `shiftR` 12)
-                        , 0x80 + ((oc `shiftR` 6) .&. 0x3f)
-                        , 0x80 + oc .&. 0x3f
-                        ]
-   | otherwise        = [ 0xf0 + (oc `shiftR` 18)
-                        , 0x80 + ((oc `shiftR` 12) .&. 0x3f)
-                        , 0x80 + ((oc `shiftR` 6) .&. 0x3f)
-                        , 0x80 + oc .&. 0x3f
-                        ]
-
--- | Decode a UTF8 string packed into a list of Word8 values, directly to String
-decode :: [Word8] -> String
-decode [    ] = ""
-decode (c:cs)
-  | c < 0x80  = chr (fromEnum c) : decode cs
-  | c < 0xc0  = replacementCharacter : decode cs
-  | c < 0xe0  = multi1
-  | c < 0xf0  = multi_byte 2 0xf  0x800
-  | c < 0xf8  = multi_byte 3 0x7  0x10000
-  | c < 0xfc  = multi_byte 4 0x3  0x200000
-  | c < 0xfe  = multi_byte 5 0x1  0x4000000
-  | otherwise = replacementCharacter : decode cs
-  where
-    multi1 = case cs of
-      c1 : ds | c1 .&. 0xc0 == 0x80 ->
-        let d = ((fromEnum c .&. 0x1f) `shiftL` 6) .|.  fromEnum (c1 .&. 0x3f)
-        in if d >= 0x000080 then toEnum d : decode ds
-                            else replacementCharacter : decode ds
-      _ -> replacementCharacter : decode cs
-
-    multi_byte :: Int -> Word8 -> Int -> String
-    multi_byte i mask overlong = aux i cs (fromEnum (c .&. mask))
-      where
-        aux 0 rs acc
-          | overlong <= acc && acc <= 0x10ffff &&
-            (acc < 0xd800 || 0xdfff < acc)     &&
-            (acc < 0xfffe || 0xffff < acc)      = chr acc : decode rs
-          | otherwise = replacementCharacter : decode rs
-
-        aux n (r:rs) acc
-          | r .&. 0xc0 == 0x80 = aux (n-1) rs
-                               $ shiftL acc 6 .|. fromEnum (r .&. 0x3f)
-
-        aux _ rs     _ = replacementCharacter : decode rs
-- 
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