{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE CPP          #-}
{-# LANGUAGE MultiWayIf   #-}

module Data.Aeson.Parser.UnescapePure
  ( unescapeText
  ) where

import           Control.Exception        (throwIO, try)
import           Data.Bits                (shiftL, shiftR, (.&.), (.|.))
import           Data.ByteString          (ByteString)
import           Data.Text                (Text)
import           Data.Text.Encoding.Error (UnicodeException (..))
import           Data.Text.Unsafe         (unsafeDupablePerformIO)
import           Data.Word                (Word32, Word8)
import           Foreign.ForeignPtr       (withForeignPtr)
import           Foreign.Ptr              (Ptr, plusPtr)
import           Foreign.Storable         (peek)

import qualified Data.Primitive           as P
import qualified Data.Text.Array          as T
import qualified Data.Text.Internal       as T

import Data.Aeson.Internal.ByteString

#if !MIN_VERSION_text(2,0,0)
import           Data.Word                (Word16)
#endif


unescapeText :: ByteString -> Either UnicodeException Text
unescapeText :: ByteString -> Either UnicodeException Text
unescapeText = forall a. IO a -> a
unsafeDupablePerformIO forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall e a. Exception e => IO a -> IO (Either e a)
try forall b c a. (b -> c) -> (a -> b) -> a -> c
. ByteString -> IO Text
unescapeTextIO

throwDecodeError :: IO a
throwDecodeError :: forall a. IO a
throwDecodeError =
  let desc :: String
desc = String
"Data.Text.Internal.Encoding.decodeUtf8: Invalid UTF-8 stream"
   in forall e a. Exception e => e -> IO a
throwIO (String -> Maybe Word8 -> UnicodeException
DecodeError String
desc forall a. Maybe a
Nothing)

-------------------------------------------------------------------------------
-- unescapeTextIO
-------------------------------------------------------------------------------

-- This function is generated using staged-streams
-- See: https://github.com/phadej/staged/blob/master/staged-streams-unicode/src/Unicode/JSON.hs
--
-- Because @aeson@ better to not use template-haskell itself,
-- we dump the splice and prettify it by hand a bit.
--
unescapeTextIO :: ByteString -> IO Text

#if MIN_VERSION_text(2,0,0)

unescapeTextIO bs = withBS bs $ \fptr len ->
  withForeignPtr fptr $ \begin -> do
    let end :: Ptr Word8
        end = plusPtr begin len

    arr <- P.newPrimArray len

    let write3bytes :: Int -> Word8 -> Word8 -> Word8 -> Ptr Word8 -> IO Text
        write3bytes !out !b1 !b2 !b3 !inp = do
          P.writePrimArray arr out b1
          write2bytes (out + 1) b2 b3 inp

        write2bytes :: Int -> Word8 -> Word8 -> Ptr Word8 -> IO Text
        write2bytes !out !b1 !b2 !inp = do
          P.writePrimArray arr out b1
          write1byte (out + 1) b2 inp

        write1byte :: Int -> Word8 -> Ptr Word8 -> IO Text
        write1byte !out !b1 !inp = do
          P.writePrimArray arr out b1
          state_start (out + 1) inp

        writeCodePoint :: Int -> Ptr Word8 -> Word32 -> IO Text
        writeCodePoint !out !inp !acc
          | acc <= 127 = do
            P.writePrimArray arr out (fromIntegral acc :: Word8)
            state_start (out + 1) (plusPtr inp 1)

          | acc <= 2047 = do
            let b1 = fromIntegral (shiftR acc 6 .|. 192) :: Word8
            let b2 = fromIntegral ((acc .&. 63) .|. 128) :: Word8
            P.writePrimArray arr out b1
            write1byte (out + 1) b2 (plusPtr inp 1)

          | acc <= 65535 = do
            let b1 = fromIntegral (shiftR acc 12 .|. 224) :: Word8
            let b2 = fromIntegral ((shiftR acc 6 .&. 63) .|.  128) :: Word8
            let b3 = fromIntegral ((acc .&. 63) .|. 128) :: Word8
            P.writePrimArray arr out b1
            write2bytes (out + 1) b2 b3 (plusPtr inp 1)

          | otherwise = do
            let b1 = fromIntegral (shiftR acc 18 .|. 240) :: Word8
            let b2 = fromIntegral ((shiftR acc 12 .&. 63) .|. 128) :: Word8
            let b3 = fromIntegral ((shiftR acc 6 .&. 63) .|. 128) :: Word8
            let b4 = fromIntegral ((acc .&. 63) .|. 128) :: Word8
            P.writePrimArray arr out b1
            write3bytes (out + 1) b2 b3 b4 (plusPtr inp 1)

        state_sudone :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
        state_sudone !out !inp !hi !lo
          | 56320 <= lo, lo <= 57343
          = writeCodePoint out inp (65536 + (shiftL (hi - 55296) 10 .|.  (lo - 56320)))
          
          | otherwise
          = throwDecodeError

        state_su4 :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
        state_su4 !out !inp !hi !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_sudone out inp hi (shiftL acc 4 .|. fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_sudone out inp hi (shiftL acc 4 .|. fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_sudone out inp hi (shiftL acc 4 .|. fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_su3 :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
        state_su3 !out !inp !hi !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_su4 out (plusPtr inp 1) hi (shiftL acc 4 .|. fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_su4 out (plusPtr inp 1) hi (shiftL acc 4 .|. fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_su4 out (plusPtr inp 1) hi (shiftL acc 4 .|. fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_su2 :: Int -> Ptr Word8 -> Word32 -> Word32 -> IO Text
        state_su2 !out !inp !hi !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 -> 
                 state_su3 out (plusPtr inp 1) hi (shiftL acc 4 .|. fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_su3 out (plusPtr inp 1) hi (shiftL acc 4 .|. fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_su3 out (plusPtr inp 1) hi (shiftL acc 4 .|. fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_su1 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_su1 !out !inp !hi
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_su2 out (plusPtr inp 1) hi (fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_su2 out (plusPtr inp 1) hi (fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_su2 out (plusPtr inp 1) hi (fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_su :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_su !out !inp !hi
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            case w8 of
              117 -> state_su1 out (plusPtr inp 1) hi
              _   -> throwDecodeError

        state_ss :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_ss !out !inp !hi
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            case w8 of
              92 -> state_su out (plusPtr inp 1) hi
              _  -> throwDecodeError

        state_udone :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_udone !out !inp !acc
          | acc < 55296 || acc > 57343 =
            writeCodePoint out inp acc

          | acc < 56320 =
            state_ss out (plusPtr inp 1) acc

          | otherwise =
            throwDecodeError

        state_u4 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_u4 !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_udone out inp (shiftL acc 4 .|. fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_udone out inp (shiftL acc 4 .|. fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_udone out inp (shiftL acc 4 .|. fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_u3 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_u3 !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_u4 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_u4 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_u4 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_u2 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_u2 !out !inp !acc
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_u3 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_u3 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_u3 out (plusPtr inp 1) (shiftL acc 4 .|. fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_u1 :: Int -> Ptr Word8 -> IO Text
        state_u1 !out !inp
          | inp == end = throwDecodeError
          | otherwise = do
            w8 <- peek inp
            if | 48 <= w8, w8 <= 57 ->
                 state_u2 out (plusPtr inp 1) (fromIntegral (w8 - 48))
               | 65 <= w8, w8 <= 70 ->
                 state_u2 out (plusPtr inp 1) (fromIntegral (w8 - 55))
               | 97 <= w8, w8 <= 102 ->
                 state_u2 out (plusPtr inp 1) (fromIntegral (w8 - 87))
               | otherwise ->
                 throwDecodeError

        state_escape :: Int -> Ptr Word8 -> IO Text
        state_escape !out !inp
          | inp == end = throwDecodeError
          | otherwise  = do
            w8 <- peek inp
            case w8 of
              34 -> do
                P.writePrimArray arr out 34
                state_start (out + 1) (plusPtr inp 1)

              92 -> do
                P.writePrimArray arr out 92
                state_start (out + 1) (plusPtr inp 1)

              47 -> do
                P.writePrimArray arr out 47
                state_start (out + 1) (plusPtr inp 1)

              98 -> do
                P.writePrimArray arr out 8
                state_start (out + 1) (plusPtr inp 1)

              102 -> do
                P.writePrimArray arr out 12
                state_start (out + 1) (plusPtr inp 1)

              110 -> do
                P.writePrimArray arr out 10
                state_start (out + 1) (plusPtr inp 1)

              114 -> do
                P.writePrimArray arr out 13
                state_start (out + 1) (plusPtr inp 1)

              116 -> do
                P.writePrimArray arr out 9
                state_start (out + 1) (plusPtr inp 1)

              117 ->
                state_u1 out (plusPtr inp 1)

              _ -> throwDecodeError

        state_input4c :: Int -> Ptr Word8 -> Word8 -> Word8 -> Word8 -> IO Text
        state_input4c !out !inp !b1 !b2 !b3
          | inp == end = throwDecodeError
          | otherwise  = do
            w8 <- peek inp
            if | (w8 .&. 192) == 128
               , let acc    = shiftL (fromIntegral (b1 .&. 7)) 18
               , let acc'   = acc .|. shiftL (fromIntegral (b2 .&. 63)) 12
               , let acc''  = acc' .|. shiftL (fromIntegral (b3 .&. 63)) 6
               , let acc''' = acc'' .|. fromIntegral (w8 .&. 63) :: Word32
               , acc''' >= 65536 && acc''' < 1114112 -> do
                 P.writePrimArray arr out b1
                 write3bytes (out + 1) b2 b3 w8 (plusPtr inp 1)

               | otherwise ->
                 throwDecodeError

        state_input4b :: Int -> Ptr Word8 -> Word8 -> Word8 -> IO Text
        state_input4b !out !inp !b1 !b2
          | inp == end = throwDecodeError
          | otherwise  = do
            w8 <- peek inp
            if | (w8 .&. 192) == 128 ->
                 state_input4c out (plusPtr inp 1) b1 b2 w8

               | otherwise ->
                 throwDecodeError

        state_input4 :: Int -> Ptr Word8 -> Word8 -> IO Text
        state_input4 !out !inp !b1
          | inp == end = throwDecodeError
          | otherwise  = do
            w8 <- peek inp
            if | (w8 .&. 192) == 128 ->
                 state_input4b out (plusPtr inp 1) b1 w8

               | otherwise ->
                 throwDecodeError

        state_input3b :: Int -> Ptr Word8 -> Word8 -> Word8 -> IO Text
        state_input3b !out !inp !b1 !b2
          | inp == end = throwDecodeError
          | otherwise  = do
            w8 <- peek inp
            if | (w8 .&. 192) == 128
               , let acc   = shiftL (fromIntegral (b1 .&. 15)) 12
               , let acc'  = acc .|.  shiftL (fromIntegral (b2 .&. 63)) 6
               , let acc'' = acc' .|. fromIntegral (w8 .&. 63) :: Word32
               , (acc'' >= 2048 && acc'' < 55296) || acc'' > 57343 -> do
                 P.writePrimArray arr out b1
                 write2bytes (out + 1) b2 w8 (plusPtr inp 1)

               | otherwise ->
                 throwDecodeError

        state_input3 :: Int -> Ptr Word8 -> Word8 -> IO Text
        state_input3 !out !inp !b1
          | inp == end = throwDecodeError
          | otherwise  = do
            w8 <- peek inp
            if | (w8 .&. 192) == 128 ->
                 state_input3b out (plusPtr inp 1) b1 w8

               | otherwise ->
                 throwDecodeError

        state_input2 :: Int -> Ptr Word8 -> Word8 -> IO Text
        state_input2 !out !inp !b1
          | inp == end = throwDecodeError
          | otherwise  = do
            w8 <- peek inp
            if | (w8 .&. 192) == 128,
                 let acc = shiftL (fromIntegral (b1 .&. 63)) 6 :: Word32
                     acc' = acc .|. fromIntegral (w8 .&. 63) :: Word32
               , acc' >= 128 -> do
                 P.writePrimArray arr out b1
                 write1byte (out + 1) w8 (plusPtr inp 1)

               | otherwise ->
                 throwDecodeError

        state_start :: Int -> Ptr Word8 -> IO Text
        state_start !out !inp
          | inp == end = do
            P.shrinkMutablePrimArray arr out
            frozenArr <- P.unsafeFreezePrimArray arr
            return $ case frozenArr of
              P.PrimArray ba -> T.Text (T.ByteArray ba) 0 out

          | otherwise = do
            w8 <- peek inp
            if | w8 == 92 -> state_escape out (plusPtr inp 1)
               | w8 < 128 -> do
                 P.writePrimArray arr out w8
                 state_start (out + 1) (plusPtr inp 1)

               | w8 < 192 -> throwDecodeError
               | w8 < 224 -> state_input2 out (plusPtr inp 1) w8
               | w8 < 240 -> state_input3 out (plusPtr inp 1) w8
               | w8 < 248 -> state_input4 out (plusPtr inp 1) w8

               | otherwise -> throwDecodeError

    -- start the state machine
    state_start (0 :: Int) begin
#else

unescapeTextIO :: ByteString -> IO Text
unescapeTextIO ByteString
bs = forall r. ByteString -> (ForeignPtr Word8 -> Int -> r) -> r
withBS ByteString
bs forall a b. (a -> b) -> a -> b
$ \ForeignPtr Word8
fptr Int
len ->
  forall a b. ForeignPtr a -> (Ptr a -> IO b) -> IO b
withForeignPtr ForeignPtr Word8
fptr forall a b. (a -> b) -> a -> b
$ \Ptr Word8
begin -> do
    let end :: Ptr Word8
        end :: Ptr Word8
end = forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
begin Int
len

    MutablePrimArray RealWorld Word16
arr <- forall (m :: * -> *) a.
(PrimMonad m, Prim a) =>
Int -> m (MutablePrimArray (PrimState m) a)
P.newPrimArray Int
len

    let writeLowSurrogate :: Int -> Word16 -> Ptr Word8 -> IO Text
        writeLowSurrogate :: Int -> Word16 -> Ptr Word8 -> IO Text
writeLowSurrogate !Int
out !Word16
w16 !Ptr Word8
inp = do
          forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out Word16
w16
          Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) Ptr Word8
inp

        state_sudone :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_sudone :: Int -> Ptr Word8 -> Word32 -> IO Text
state_sudone !Int
out !Ptr Word8
inp !Word32
lo
          | Word32
56320 forall a. Ord a => a -> a -> Bool
<= Word32
lo, Word32
lo forall a. Ord a => a -> a -> Bool
<= Word32
57343 = do
            forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out (forall a b. (Integral a, Num b) => a -> b
fromIntegral Word32
lo)
            Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

          | Bool
otherwise =
            forall a. IO a
throwDecodeError

        state_su4 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_su4 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_su4 !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_sudone Int
out Ptr Word8
inp (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_sudone Int
out Ptr Word8
inp (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_sudone Int
out Ptr Word8
inp (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 forall a. IO a
throwDecodeError

        state_su3 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_su3 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_su3 !Int
out !Ptr Word8
inp  !Word32
acc
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_su4 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_su4 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_su4 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise -> forall a. IO a
throwDecodeError

        state_su2 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_su2 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_su2 !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_su3 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_su3 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_su3 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 forall a. IO a
throwDecodeError

        state_su1 :: Int -> Ptr Word8 -> IO Text
        state_su1 :: Int -> Ptr Word8 -> IO Text
state_su1 !Int
out !Ptr Word8
inp
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_su2 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_su2 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_su2 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 forall a. IO a
throwDecodeError

        -- high surrogate u
        state_su :: Int -> Ptr Word8 -> IO Text
        state_su :: Int -> Ptr Word8 -> IO Text
state_su !Int
out !Ptr Word8
inp
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            case Word8
w8 of
              Word8
117 -> Int -> Ptr Word8 -> IO Text
state_su1 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)
              Word8
_   -> forall a. IO a
throwDecodeError

        -- high surrogate slash
        state_ss :: Int -> Ptr Word8 -> IO Text
        state_ss :: Int -> Ptr Word8 -> IO Text
state_ss !Int
out !Ptr Word8
inp
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            case Word8
w8 of
              Word8
92 -> Int -> Ptr Word8 -> IO Text
state_su Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)
              Word8
_  -> forall a. IO a
throwDecodeError

        state_udone :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_udone :: Int -> Ptr Word8 -> Word32 -> IO Text
state_udone !Int
out !Ptr Word8
inp !Word32
acc
          -- we know that codepoint in acc is in BMP
          | Word32
acc forall a. Ord a => a -> a -> Bool
< Word32
55296 Bool -> Bool -> Bool
|| Word32
acc forall a. Ord a => a -> a -> Bool
> Word32
57343 = do
            forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out (forall a b. (Integral a, Num b) => a -> b
fromIntegral Word32
acc)
            Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

          -- hi surrogate,
          -- we write it immediately (UTF16 as an output!)
          | Word32
acc forall a. Ord a => a -> a -> Bool
< Word32
56320 = do
            forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out (forall a b. (Integral a, Num b) => a -> b
fromIntegral Word32
acc)
            Int -> Ptr Word8 -> IO Text
state_ss (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

          | Bool
otherwise =
            forall a. IO a
throwDecodeError

        state_u4 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_u4 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_u4 !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_udone Int
out Ptr Word8
inp (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_udone Int
out Ptr Word8
inp (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_udone Int
out Ptr Word8
inp (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 forall a. IO a
throwDecodeError

        state_u3 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_u3 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_u3 !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u4 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u4 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u4 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 forall a. IO a
throwDecodeError

        state_u2 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_u2 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_u2 !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u3 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u3 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u3 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL Word32
acc Int
4 forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 forall a. IO a
throwDecodeError

        state_u1 :: Int -> Ptr Word8 -> IO Text
        state_u1 :: Int -> Ptr Word8 -> IO Text
state_u1 !Int
out !Ptr Word8
inp
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
48 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
57 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u2 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
48))
               | Word8
65 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
70 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u2 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
55))
               | Word8
97 forall a. Ord a => a -> a -> Bool
<= Word8
w8, Word8
w8 forall a. Ord a => a -> a -> Bool
<= Word8
102 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_u2 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Num a => a -> a -> a
- Word8
87))
               | Bool
otherwise ->
                 forall a. IO a
throwDecodeError

        state_escape :: Int -> Ptr Word8 -> IO Text
        state_escape :: Int -> Ptr Word8 -> IO Text
state_escape Int
out Ptr Word8
inp
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            case Word8
w8 of
              Word8
34 -> do
                forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out Word16
34
                Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
92 -> do
                forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out Word16
92
                Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
47 -> do
                forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out Word16
47
                Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
98 -> do
                forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out Word16
8
                Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
102 -> do
                forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out Word16
12
                Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
110 -> do
                forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out Word16
10
                Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
114 -> do
                forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out Word16
13
                Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
116 -> do
                forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out Word16
9
                Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
117 ->
                Int -> Ptr Word8 -> IO Text
state_u1 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

              Word8
_ -> forall a. IO a
throwDecodeError

        state_input4c :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_input4c :: Int -> Ptr Word8 -> Word32 -> IO Text
state_input4c !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
0xc0) forall a. Eq a => a -> a -> Bool
== Word8
0x80
               , let acc' :: Word32
acc' = Word32
acc forall a. Bits a => a -> a -> a
.|.  forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
63)
               , Word32
acc' forall a. Ord a => a -> a -> Bool
>= Word32
65536 Bool -> Bool -> Bool
&& Word32
acc' forall a. Ord a => a -> a -> Bool
< Word32
1114112 ->
                 if {- -- | acc' < 65536 -> do
                       --   P.writePrimArray arr out (fromIntegral acc' :: Word16)
                       --   state_start (out + 1) (plusPtr inp 1) -}
                    | Bool
otherwise -> do
                      let u :: Word32
u = Word32
acc' forall a. Num a => a -> a -> a
- Word32
65536
                          hi :: Word16
hi = forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word32
55296 forall a. Num a => a -> a -> a
+ forall a. Bits a => a -> Int -> a
shiftR Word32
u Int
10) :: Word16
                          lo :: Word16
lo = forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word32
56320 forall a. Num a => a -> a -> a
+ (Word32
u forall a. Bits a => a -> a -> a
.&. Word32
1023)) :: Word16
                      forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out Word16
hi
                      Int -> Word16 -> Ptr Word8 -> IO Text
writeLowSurrogate (Int
out forall a. Num a => a -> a -> a
+ Int
1) Word16
lo (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

               | Bool
otherwise -> forall a. IO a
throwDecodeError

        state_input4b :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_input4b :: Int -> Ptr Word8 -> Word32 -> IO Text
state_input4b !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
0xc0) forall a. Eq a => a -> a -> Bool
== Word8
0x80 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_input4c Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (Word32
acc forall a. Bits a => a -> a -> a
.|. forall a. Bits a => a -> Int -> a
shiftL (forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
63)) Int
6)

               | Bool
otherwise -> forall a. IO a
throwDecodeError

        state_input4 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_input4 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_input4 !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
0xc0) forall a. Eq a => a -> a -> Bool
== Word8
0x80 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_input4b Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (Word32
acc forall a. Bits a => a -> a -> a
.|. forall a. Bits a => a -> Int -> a
shiftL (forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
63)) Int
12)

               | Bool
otherwise -> forall a. IO a
throwDecodeError

        state_input3b :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_input3b :: Int -> Ptr Word8 -> Word32 -> IO Text
state_input3b !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
0xc0) forall a. Eq a => a -> a -> Bool
== Word8
0x80
               , let acc' :: Word32
acc' = Word32
acc forall a. Bits a => a -> a -> a
.|.  forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
63)
               , (Word32
acc' forall a. Ord a => a -> a -> Bool
>= Word32
2048 Bool -> Bool -> Bool
&& Word32
acc' forall a. Ord a => a -> a -> Bool
< Word32
55296) Bool -> Bool -> Bool
|| Word32
acc' forall a. Ord a => a -> a -> Bool
> Word32
57343 ->
                 if | Word32
acc' forall a. Ord a => a -> a -> Bool
< Word32
65536 -> do
                      forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out (forall a b. (Integral a, Num b) => a -> b
fromIntegral Word32
acc')
                      Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

                    | Bool
otherwise -> do
                      let u :: Word32
u = Word32
acc' forall a. Num a => a -> a -> a
- Word32
65536
                          hi :: Word16
hi = forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word32
55296 forall a. Num a => a -> a -> a
+ forall a. Bits a => a -> Int -> a
shiftR Word32
u Int
10) :: Word16
                          lo :: Word16
lo = forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word32
56320 forall a. Num a => a -> a -> a
+ (Word32
u forall a. Bits a => a -> a -> a
.&. Word32
1023)) :: Word16
                      forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out Word16
hi
                      Int -> Word16 -> Ptr Word8 -> IO Text
writeLowSurrogate (Int
out forall a. Num a => a -> a -> a
+ Int
1) Word16
lo (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

               | Bool
otherwise -> forall a. IO a
throwDecodeError

        state_input3 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_input3 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_input3 !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
0xc0) forall a. Eq a => a -> a -> Bool
== Word8
0x80 ->
                 Int -> Ptr Word8 -> Word32 -> IO Text
state_input3b Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (Word32
acc forall a. Bits a => a -> a -> a
.|. forall a. Bits a => a -> Int -> a
shiftL (forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
63)) Int
6)
               | Bool
otherwise -> forall a. IO a
throwDecodeError

        state_input2 :: Int -> Ptr Word8 -> Word32 -> IO Text
        state_input2 :: Int -> Ptr Word8 -> Word32 -> IO Text
state_input2 !Int
out !Ptr Word8
inp !Word32
acc
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = forall a. IO a
throwDecodeError
          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
0xc0) forall a. Eq a => a -> a -> Bool
== Word8
0x80
               , let acc' :: Word32
acc' = Word32
acc forall a. Bits a => a -> a -> a
.|. forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
63)
               , Word32
acc' forall a. Ord a => a -> a -> Bool
>= Word32
0x80 -> do
                 forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out (forall a b. (Integral a, Num b) => a -> b
fromIntegral Word32
acc' :: Word16)
                 Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

               | Bool
otherwise -> forall a. IO a
throwDecodeError

        state_start :: Int -> Ptr Word8 -> IO Text
        state_start :: Int -> Ptr Word8 -> IO Text
state_start !Int
out !Ptr Word8
inp
          | Ptr Word8
inp forall a. Eq a => a -> a -> Bool
== Ptr Word8
end = do
            forall (m :: * -> *) a.
(PrimMonad m, Prim a) =>
MutablePrimArray (PrimState m) a -> Int -> m ()
P.shrinkMutablePrimArray MutablePrimArray RealWorld Word16
arr Int
out
            PrimArray Word16
frozenArr <- forall (m :: * -> *) a.
PrimMonad m =>
MutablePrimArray (PrimState m) a -> m (PrimArray a)
P.unsafeFreezePrimArray MutablePrimArray RealWorld Word16
arr
            forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ case PrimArray Word16
frozenArr of
              P.PrimArray ByteArray#
ba -> Array -> Int -> Int -> Text
T.Text (ByteArray# -> Array
T.Array ByteArray#
ba) Int
0 Int
out

          | Bool
otherwise = do
            Word8
w8 <- forall a. Storable a => Ptr a -> IO a
peek Ptr Word8
inp
            if | Word8
w8 forall a. Eq a => a -> a -> Bool
== Word8
92 -> Int -> Ptr Word8 -> IO Text
state_escape Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)
               | Word8
w8 forall a. Ord a => a -> a -> Bool
< Word8
0x80 -> do
                  forall a (m :: * -> *).
(Prim a, PrimMonad m) =>
MutablePrimArray (PrimState m) a -> Int -> a -> m ()
P.writePrimArray MutablePrimArray RealWorld Word16
arr Int
out (forall a b. (Integral a, Num b) => a -> b
fromIntegral Word8
w8 :: Word16)
                  Int -> Ptr Word8 -> IO Text
state_start (Int
out forall a. Num a => a -> a -> a
+ Int
1) (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1)

               | Word8
w8 forall a. Ord a => a -> a -> Bool
< Word8
0xc0 -> forall a. IO a
throwDecodeError
               | Word8
w8 forall a. Ord a => a -> a -> Bool
< Word8
224 -> Int -> Ptr Word8 -> Word32 -> IO Text
state_input2 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL (forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
63)) Int
6)
               | Word8
w8 forall a. Ord a => a -> a -> Bool
< Word8
240 -> Int -> Ptr Word8 -> Word32 -> IO Text
state_input3 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL (forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Bits a => a -> a -> a
.&. Word8
15)) Int
12)
               | Word8
w8 forall a. Ord a => a -> a -> Bool
< Word8
248 -> Int -> Ptr Word8 -> Word32 -> IO Text
state_input4 Int
out (forall a b. Ptr a -> Int -> Ptr b
plusPtr Ptr Word8
inp Int
1) (forall a. Bits a => a -> Int -> a
shiftL (forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word8
w8 forall a. Bits a => a -> a -> a
.&.  Word8
7)) Int
18)
               | Bool
otherwise -> forall a. IO a
throwDecodeError

    -- start the state machine
    Int -> Ptr Word8 -> IO Text
state_start (Int
0 :: Int) Ptr Word8
begin

#endif