{-# LANGUAGE CPP, MagicHash, UnboxedTuples #-}
module Data.Text.Unsafe
(
inlineInterleaveST
, inlinePerformIO
, unsafeDupablePerformIO
, Iter(..)
, iter
, iterArray
, iter_
, reverseIter
, reverseIterArray
, reverseIter_
, unsafeHead
, unsafeTail
, lengthWord8
, takeWord8
, dropWord8
) where
#if defined(ASSERTS)
import Control.Exception (assert)
import GHC.Stack (HasCallStack)
#endif
import Data.Text.Internal.Encoding.Utf8 (chr2, chr3, chr4, utf8LengthByLeader)
import Data.Text.Internal (Text(..))
import Data.Text.Internal.Unsafe (inlineInterleaveST, inlinePerformIO)
import Data.Text.Internal.Unsafe.Char (unsafeChr8)
import qualified Data.Text.Array as A
import GHC.IO (unsafeDupablePerformIO)
unsafeHead :: Text -> Char
unsafeHead :: Text -> Char
unsafeHead (Text Array
arr Int
off Int
_len) = case Word8 -> Int
utf8LengthByLeader Word8
m0 of
Int
1 -> Word8 -> Char
unsafeChr8 Word8
m0
Int
2 -> Word8 -> Word8 -> Char
chr2 Word8
m0 Word8
m1
Int
3 -> Word8 -> Word8 -> Word8 -> Char
chr3 Word8
m0 Word8
m1 Word8
m2
Int
_ -> Word8 -> Word8 -> Word8 -> Word8 -> Char
chr4 Word8
m0 Word8
m1 Word8
m2 Word8
m3
where m0 :: Word8
m0 = Array -> Int -> Word8
A.unsafeIndex Array
arr Int
off
m1 :: Word8
m1 = Array -> Int -> Word8
A.unsafeIndex Array
arr (Int
offInt -> Int -> Int
forall a. Num a => a -> a -> a
+Int
1)
m2 :: Word8
m2 = Array -> Int -> Word8
A.unsafeIndex Array
arr (Int
offInt -> Int -> Int
forall a. Num a => a -> a -> a
+Int
2)
m3 :: Word8
m3 = Array -> Int -> Word8
A.unsafeIndex Array
arr (Int
offInt -> Int -> Int
forall a. Num a => a -> a -> a
+Int
3)
{-# INLINE unsafeHead #-}
unsafeTail :: Text -> Text
unsafeTail :: Text -> Text
unsafeTail t :: Text
t@(Text Array
arr Int
off Int
len) =
#if defined(ASSERTS)
assert (d <= len) $
#endif
Array -> Int -> Int -> Text
Text Array
arr (Int
offInt -> Int -> Int
forall a. Num a => a -> a -> a
+Int
d) (Int
lenInt -> Int -> Int
forall a. Num a => a -> a -> a
-Int
d)
where d :: Int
d = Text -> Int -> Int
iter_ Text
t Int
0
{-# INLINE unsafeTail #-}
data Iter = Iter {-# UNPACK #-} !Char {-# UNPACK #-} !Int
deriving (Int -> Iter -> ShowS
[Iter] -> ShowS
Iter -> String
(Int -> Iter -> ShowS)
-> (Iter -> String) -> ([Iter] -> ShowS) -> Show Iter
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
$cshowsPrec :: Int -> Iter -> ShowS
showsPrec :: Int -> Iter -> ShowS
$cshow :: Iter -> String
show :: Iter -> String
$cshowList :: [Iter] -> ShowS
showList :: [Iter] -> ShowS
Show)
iter ::
#if defined(ASSERTS)
HasCallStack =>
#endif
Text -> Int -> Iter
iter :: Text -> Int -> Iter
iter (Text Array
arr Int
off Int
_len) Int
i = Array -> Int -> Iter
iterArray Array
arr (Int
off Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
i)
{-# INLINE iter #-}
iterArray :: A.Array -> Int -> Iter
iterArray :: Array -> Int -> Iter
iterArray Array
arr Int
j = Char -> Int -> Iter
Iter Char
chr Int
l
where m0 :: Word8
m0 = Array -> Int -> Word8
A.unsafeIndex Array
arr Int
j
m1 :: Word8
m1 = Array -> Int -> Word8
A.unsafeIndex Array
arr (Int
jInt -> Int -> Int
forall a. Num a => a -> a -> a
+Int
1)
m2 :: Word8
m2 = Array -> Int -> Word8
A.unsafeIndex Array
arr (Int
jInt -> Int -> Int
forall a. Num a => a -> a -> a
+Int
2)
m3 :: Word8
m3 = Array -> Int -> Word8
A.unsafeIndex Array
arr (Int
jInt -> Int -> Int
forall a. Num a => a -> a -> a
+Int
3)
l :: Int
l = Word8 -> Int
utf8LengthByLeader Word8
m0
chr :: Char
chr = case Int
l of
Int
1 -> Word8 -> Char
unsafeChr8 Word8
m0
Int
2 -> Word8 -> Word8 -> Char
chr2 Word8
m0 Word8
m1
Int
3 -> Word8 -> Word8 -> Word8 -> Char
chr3 Word8
m0 Word8
m1 Word8
m2
Int
_ -> Word8 -> Word8 -> Word8 -> Word8 -> Char
chr4 Word8
m0 Word8
m1 Word8
m2 Word8
m3
{-# INLINE iterArray #-}
iter_ :: Text -> Int -> Int
iter_ :: Text -> Int -> Int
iter_ (Text Array
arr Int
off Int
_len) Int
i = Word8 -> Int
utf8LengthByLeader Word8
m
where m :: Word8
m = Array -> Int -> Word8
A.unsafeIndex Array
arr (Int
offInt -> Int -> Int
forall a. Num a => a -> a -> a
+Int
i)
{-# INLINE iter_ #-}
reverseIter :: Text -> Int -> Iter
reverseIter :: Text -> Int -> Iter
reverseIter (Text Array
arr Int
off Int
_len) Int
i = Array -> Int -> Iter
reverseIterArray Array
arr (Int
off Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
i)
{-# INLINE reverseIter #-}
reverseIterArray :: A.Array -> Int -> Iter
reverseIterArray :: Array -> Int -> Iter
reverseIterArray Array
arr Int
j
| Word8
m0 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
< Word8
0x80 = Char -> Int -> Iter
Iter (Word8 -> Char
unsafeChr8 Word8
m0) (-Int
1)
| Word8
m1 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
>= Word8
0xC0 = Char -> Int -> Iter
Iter (Word8 -> Word8 -> Char
chr2 Word8
m1 Word8
m0) (-Int
2)
| Word8
m2 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
>= Word8
0xC0 = Char -> Int -> Iter
Iter (Word8 -> Word8 -> Word8 -> Char
chr3 Word8
m2 Word8
m1 Word8
m0) (-Int
3)
| Bool
otherwise = Char -> Int -> Iter
Iter (Word8 -> Word8 -> Word8 -> Word8 -> Char
chr4 Word8
m3 Word8
m2 Word8
m1 Word8
m0) (-Int
4)
where m0 :: Word8
m0 = Array -> Int -> Word8
A.unsafeIndex Array
arr Int
j
m1 :: Word8
m1 = Array -> Int -> Word8
A.unsafeIndex Array
arr (Int
jInt -> Int -> Int
forall a. Num a => a -> a -> a
-Int
1)
m2 :: Word8
m2 = Array -> Int -> Word8
A.unsafeIndex Array
arr (Int
jInt -> Int -> Int
forall a. Num a => a -> a -> a
-Int
2)
m3 :: Word8
m3 = Array -> Int -> Word8
A.unsafeIndex Array
arr (Int
jInt -> Int -> Int
forall a. Num a => a -> a -> a
-Int
3)
{-# INLINE reverseIterArray #-}
reverseIter_ :: Text -> Int -> Int
reverseIter_ :: Text -> Int -> Int
reverseIter_ (Text Array
arr Int
off Int
_len) Int
i
| Word8
m0 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
< Word8
0x80 = -Int
1
| Word8
m1 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
>= Word8
0xC0 = -Int
2
| Word8
m2 Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
>= Word8
0xC0 = -Int
3
| Bool
otherwise = -Int
4
where m0 :: Word8
m0 = Array -> Int -> Word8
A.unsafeIndex Array
arr Int
j
m1 :: Word8
m1 = Array -> Int -> Word8
A.unsafeIndex Array
arr (Int
jInt -> Int -> Int
forall a. Num a => a -> a -> a
-Int
1)
m2 :: Word8
m2 = Array -> Int -> Word8
A.unsafeIndex Array
arr (Int
jInt -> Int -> Int
forall a. Num a => a -> a -> a
-Int
2)
j :: Int
j = Int
off Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
i
{-# INLINE reverseIter_ #-}
lengthWord8 :: Text -> Int
lengthWord8 :: Text -> Int
lengthWord8 (Text Array
_arr Int
_off Int
len) = Int
len
{-# INLINE lengthWord8 #-}
takeWord8 :: Int -> Text -> Text
takeWord8 :: Int -> Text -> Text
takeWord8 Int
k (Text Array
arr Int
off Int
_len) = Array -> Int -> Int -> Text
Text Array
arr Int
off Int
k
{-# INLINE takeWord8 #-}
dropWord8 :: Int -> Text -> Text
dropWord8 :: Int -> Text -> Text
dropWord8 Int
k (Text Array
arr Int
off Int
len) = Array -> Int -> Int -> Text
Text Array
arr (Int
offInt -> Int -> Int
forall a. Num a => a -> a -> a
+Int
k) (Int
lenInt -> Int -> Int
forall a. Num a => a -> a -> a
-Int
k)
{-# INLINE dropWord8 #-}