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module TextBuilderDev.Utf16View where
import TextBuilderDev.Prelude
import qualified TextBuilderDev.Unicode as Unicode
-- |
-- A matching function, which chooses the continuation to run.
type Utf16View =
forall x. (Word16 -> x) -> (Word16 -> Word16 -> x) -> x
{-# INLINE char #-}
char :: Char -> Utf16View
char x =
unicodeCodePoint (ord x)
{-# INLINE unicodeCodePoint #-}
unicodeCodePoint :: Int -> Utf16View
unicodeCodePoint x case1 case2 =
if x < 0x10000
then case1 (fromIntegral x)
else case2 case2Unit1 case2Unit2
where
m =
x - 0x10000
case2Unit1 =
fromIntegral (shiftR m 10 + 0xD800)
case2Unit2 =
fromIntegral ((m .&. 0x3FF) + 0xDC00)
{-# INLINE utf8CodeUnits1 #-}
utf8CodeUnits1 :: Word8 -> Utf16View
utf8CodeUnits1 x case1 _ =
case1 (fromIntegral x)
{-# INLINE utf8CodeUnits2 #-}
utf8CodeUnits2 :: Word8 -> Word8 -> Utf16View
utf8CodeUnits2 byte1 byte2 case1 _ =
case1 (shiftL (fromIntegral byte1 - 0xC0) 6 + fromIntegral byte2 - 0x80)
{-# INLINE utf8CodeUnits3 #-}
utf8CodeUnits3 :: Word8 -> Word8 -> Word8 -> Utf16View
utf8CodeUnits3 byte1 byte2 byte3 =
unicodeCodePoint (Unicode.utf8CodeUnits3 byte1 byte2 byte3)
{-# INLINE utf8CodeUnits4 #-}
utf8CodeUnits4 :: Word8 -> Word8 -> Word8 -> Word8 -> Utf16View
utf8CodeUnits4 byte1 byte2 byte3 byte4 =
unicodeCodePoint (Unicode.utf8CodeUnits4 byte1 byte2 byte3 byte4)
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