-- | Contains functions for constructing and working with foreign simdjson instances.

module Data.Hermes.SIMDJSON.Wrapper
  ( getDocumentInfo
  , mkSIMDParser
  , mkSIMDDocument
  , mkSIMDPaddedStr
  , withInputBuffer
  )
  where

import           Control.Monad.IO.Class (liftIO)
import           Data.ByteString (ByteString)
import qualified Data.ByteString.Unsafe as Unsafe
import           Data.Maybe (fromMaybe)
import           Data.Text (Text)
import qualified Data.Text as T
import           Control.Exception (bracket, mask_)
import qualified Foreign.C as F
import qualified Foreign.ForeignPtr as F
import qualified Foreign.Marshal.Alloc as F
import qualified Foreign.Storable as F

import           Data.Hermes.SIMDJSON.Bindings
  ( currentLocationImpl
  , deleteDocumentImpl
  , deleteInputImpl
  , makeDocumentImpl
  , makeInputImpl
  , parserDestroy
  , parserInit
  , toDebugStringImpl
  )
import           Data.Hermes.SIMDJSON.Types
  ( Document
  , InputBuffer(..)
  , PaddedString
  , SIMDDocument
  , SIMDErrorCode(..)
  , SIMDParser
  )

mkSIMDParser :: Maybe Int -> IO (F.ForeignPtr SIMDParser)
mkSIMDParser :: Maybe Int -> IO (ForeignPtr SIMDParser)
mkSIMDParser Maybe Int
mCap = forall a. IO a -> IO a
mask_ forall a b. (a -> b) -> a -> b
$ do
  let maxCap :: Int
maxCap = Int
4000000000; -- 4GB
  Ptr SIMDParser
ptr <- CSize -> IO (Ptr SIMDParser)
parserInit forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a. Enum a => Int -> a
toEnum forall a b. (a -> b) -> a -> b
$ forall a. a -> Maybe a -> a
fromMaybe Int
maxCap Maybe Int
mCap
  forall a. FinalizerPtr a -> Ptr a -> IO (ForeignPtr a)
F.newForeignPtr FunPtr (Ptr SIMDParser -> IO ())
parserDestroy Ptr SIMDParser
ptr

mkSIMDDocument :: IO (F.ForeignPtr SIMDDocument)
mkSIMDDocument :: IO (ForeignPtr SIMDDocument)
mkSIMDDocument = forall a. IO a -> IO a
mask_ forall a b. (a -> b) -> a -> b
$ do
  Ptr SIMDDocument
ptr <- IO (Ptr SIMDDocument)
makeDocumentImpl
  forall a. FinalizerPtr a -> Ptr a -> IO (ForeignPtr a)
F.newForeignPtr FunPtr (Ptr SIMDDocument -> IO ())
deleteDocumentImpl Ptr SIMDDocument
ptr

mkSIMDPaddedStr :: ByteString -> IO (F.ForeignPtr PaddedString)
mkSIMDPaddedStr :: ByteString -> IO (ForeignPtr PaddedString)
mkSIMDPaddedStr ByteString
input = forall a. IO a -> IO a
mask_ forall a b. (a -> b) -> a -> b
$
  forall a. ByteString -> (CStringLen -> IO a) -> IO a
Unsafe.unsafeUseAsCStringLen ByteString
input forall a b. (a -> b) -> a -> b
$ \(CString
cstr, Int
len) -> do
    Ptr PaddedString
ptr <- CString -> CSize -> IO (Ptr PaddedString)
makeInputImpl CString
cstr (forall a b. (Integral a, Num b) => a -> b
fromIntegral Int
len)
    forall a. FinalizerPtr a -> Ptr a -> IO (ForeignPtr a)
F.newForeignPtr FunPtr (Ptr PaddedString -> IO ())
deleteInputImpl Ptr PaddedString
ptr

-- | Construct a simdjson:padded_string from a Haskell `ByteString`, and pass
-- it to an IO action. The instance lifetime is managed by the `bracket` function.
withInputBuffer :: ByteString -> (InputBuffer -> IO a) -> IO a
withInputBuffer :: forall a. ByteString -> (InputBuffer -> IO a) -> IO a
withInputBuffer ByteString
bs InputBuffer -> IO a
f =
  forall a b c. IO a -> (a -> IO b) -> (a -> IO c) -> IO c
bracket IO (ForeignPtr PaddedString)
acquire forall {a}. ForeignPtr a -> IO ()
release forall a b. (a -> b) -> a -> b
$ \ForeignPtr PaddedString
fPtr -> forall a b. ForeignPtr a -> (Ptr a -> IO b) -> IO b
F.withForeignPtr ForeignPtr PaddedString
fPtr forall a b. (a -> b) -> a -> b
$ InputBuffer -> IO a
f forall b c a. (b -> c) -> (a -> b) -> a -> c
. Ptr PaddedString -> InputBuffer
InputBuffer
  where
    acquire :: IO (ForeignPtr PaddedString)
acquire = ByteString -> IO (ForeignPtr PaddedString)
mkSIMDPaddedStr ByteString
bs
    release :: ForeignPtr a -> IO ()
release = forall {a}. ForeignPtr a -> IO ()
F.finalizeForeignPtr

-- | Read the document location and debug string. If the iterator is out of bounds
-- then we abort reading from the iterator buffers to prevent reading garbage.
getDocumentInfo :: Document -> IO (Text, Text)
getDocumentInfo :: Document -> IO (Text, Text)
getDocumentInfo Document
docPtr = forall a b. Storable a => (Ptr a -> IO b) -> IO b
F.alloca forall a b. (a -> b) -> a -> b
$ \Ptr CString
locStrPtr -> forall a b. Storable a => (Ptr a -> IO b) -> IO b
F.alloca forall a b. (a -> b) -> a -> b
$ \Ptr CSize
lenPtr -> do
  CInt
err <- forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO forall a b. (a -> b) -> a -> b
$ Document -> Ptr CString -> IO CInt
currentLocationImpl Document
docPtr Ptr CString
locStrPtr
  let errCode :: SIMDErrorCode
errCode = forall a. Enum a => Int -> a
toEnum forall a b. (a -> b) -> a -> b
$ forall a b. (Integral a, Num b) => a -> b
fromIntegral CInt
err
  if SIMDErrorCode
errCode forall a. Eq a => a -> a -> Bool
== SIMDErrorCode
OUT_OF_BOUNDS
    then forall (f :: * -> *) a. Applicative f => a -> f a
pure (Text
"out of bounds", Text
"")
    else forall a b. Int -> (Ptr a -> IO b) -> IO b
F.allocaBytes Int
128 forall a b. (a -> b) -> a -> b
$ \CString
dbStrPtr -> do
      Text
locStr <- forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap String -> Text
T.pack forall a b. (a -> b) -> a -> b
$ CString -> IO String
F.peekCString forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< forall a. Storable a => Ptr a -> IO a
F.peek Ptr CString
locStrPtr
      Document -> CString -> Ptr CSize -> IO ()
toDebugStringImpl Document
docPtr CString
dbStrPtr Ptr CSize
lenPtr
      Int
len <- forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap forall a b. (Integral a, Num b) => a -> b
fromIntegral forall a b. (a -> b) -> a -> b
$ forall a. Storable a => Ptr a -> IO a
F.peek Ptr CSize
lenPtr
      Text
debugStr <- forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap String -> Text
T.pack forall a b. (a -> b) -> a -> b
$ CStringLen -> IO String
F.peekCStringLen (CString
dbStrPtr, Int
len)
      forall (f :: * -> *) a. Applicative f => a -> f a
pure (Text
locStr, Text
debugStr)