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|
{-# OPTIONS_GHC -fno-warn-orphans #-}
{-|
Copyright : © 2017-2024 Albert Krewinkel
License : MIT
Tests for Aeson–Lua glue.
-}
import Control.Monad (when)
import Data.Aeson (ToJSON, object, (.=))
import Data.Scientific (Scientific, fromFloatDigits, toRealFloat)
import Data.Text (Text)
import HsLua.Core as Lua
import HsLua.Marshalling
import HsLua.Aeson
import Test.QuickCheck.Monadic (assert)
import Test.Tasty (TestTree, defaultMain, testGroup)
import Test.Tasty.HUnit ((@?=), testCase)
import Test.Tasty.QuickCheck
import Test.QuickCheck.Instances ()
import qualified Data.Aeson as Aeson
import qualified Data.Vector as Vector
import qualified Test.QuickCheck.Monadic as QC
#if MIN_VERSION_aeson(2,0,0)
import qualified Data.Aeson.KeyMap as KeyMap
#if !MIN_VERSION_aeson(2,0,3)
import Data.Aeson.Key (Key, fromText)
#endif
#else
import qualified Data.HashMap.Strict as KeyMap
#endif
-- | Run this spec.
main :: IO ()
main = defaultMain tests
-- | Aeson tests
tests :: TestTree
tests = testGroup "hslua-aeson"
[ testGroup "Value"
[ testProperty "can be round-tripped through the stack" $
assertRoundtripEqual pushValue peekValue . numbersToDoubles
, testProperty "can roundtrip a bool nested in 50 layers of arrays" $
\b -> QC.monadicIO $ do
let go _ x = Aeson.Array $ Vector.fromList [x]
mkValue a = foldr go (Aeson.Bool a) [(1::Int) .. 50]
x <- QC.run . run @Lua.Exception $ do
pushValue $ mkValue b
forcePeek $ peekValue top
return (x === mkValue b)
, testProperty "can roundtrip a bool nested in 50 layers of objects" $
\b -> QC.monadicIO $ do
let go _ x = Aeson.Object $ KeyMap.fromList [("x", x)]
mkValue a = foldr go (Aeson.Bool a) [(1::Int) .. 50]
x <- QC.run . run @Lua.Exception $ do
pushValue $ mkValue b
forcePeek $ peekValue top
return (x === mkValue b)
, testProperty "can roundtrip a null nested in 50 layers of objects" $
\() -> QC.monadicIO $ do
let go _ x = Aeson.Object $ KeyMap.fromList [("x", x)]
mkValue = foldr go Aeson.Null [(1::Int) .. 50]
x <- QC.run . run @Lua.Exception $ do
pushValue mkValue
forcePeek $ peekValue top
return (x === mkValue)
]
, testGroup "via JSON"
[ testProperty "can roundtrip 'Maybe Text' via JSON" $
assertRoundtripEqual @(Maybe Int) pushViaJSON peekViaJSON
, testProperty "can roundtrip '(Int, Float)' via JSON" $
assertRoundtripEqual @(Int, Float) pushViaJSON peekViaJSON
, testProperty "can roundtrip 'Either Bool Text' via JSON" $
assertRoundtripEqual @(Either Bool Text) pushViaJSON peekViaJSON
]
, testGroup "special encodings"
[ testGroup "__toaeson"
[ testCase "respect __toaeson metamethod" . run @Lua.Exception $ do
pushTwentyThree TwentyThree
val <- forcePeek $ peekValue top
liftIO $ object [ "title" .= (23 :: Int) ] @?= val
]
, testGroup "__tojson"
[ testCase "respect __tojson metamethod" . run @Lua.Exception $ do
newtable -- object
newtable -- metatable
pushHaskellFunction (1 <$ pushText "{\"answer\": 42}")
setfield (nth 2) "__tojson"
setmetatable (nth 2)
val <- forcePeek $ peekValue top
liftIO $ object [ "answer" .= (42 :: Int) ] @?= val
]
]
]
assertRoundtripEqual :: Eq a
=> Pusher Lua.Exception a -> Peeker Lua.Exception a
-> a -> Property
assertRoundtripEqual pushX peekX x = QC.monadicIO $ do
y <- QC.run $ roundtrip pushX peekX x
assert (x == y)
roundtrip :: Pusher Lua.Exception a -> Peeker Lua.Exception a -> a -> IO a
roundtrip pushX peekX x = run $ do
pushX x
size <- gettop
when (size /= 1) $
failLua $ "not the right amount of elements on the stack: " ++ show size
result <- forcePeek $ peekX top
afterPeekSize <- gettop
when (afterPeekSize /= 1) $
failLua $ "peeking modified the stack: " ++ show afterPeekSize
return result
-- | Ensure that numbers are representable as Doubles.
numbersToDoubles :: Aeson.Value -> Aeson.Value
numbersToDoubles (Aeson.Number x) = Aeson.Number . luaNumberToScientific $
toRealFloat x
numbersToDoubles (Aeson.Object x) = Aeson.Object $ fmap numbersToDoubles x
numbersToDoubles (Aeson.Array x) = Aeson.Array $ fmap numbersToDoubles x
numbersToDoubles x = x
-- | Convert a Lua number to a scientific number, which are the basis for JSON
-- numbers.
luaNumberToScientific :: Lua.Number -> Scientific
luaNumberToScientific = fromFloatDigits . (realToFrac :: Lua.Number -> Double)
-- aeson defines instances for Arbitrary since 2.0.3.0
#if !MIN_VERSION_aeson(2,0,3)
instance Arbitrary Aeson.Value where
arbitrary = arbitraryValue 9
#if MIN_VERSION_aeson(2,0,0)
instance Arbitrary Key where
arbitrary = fmap fromText arbitrary
instance Arbitrary a => Arbitrary (KeyMap.KeyMap a) where
arbitrary = fmap KeyMap.fromList arbitrary
#endif
arbitraryValue :: Int -> Gen Aeson.Value
arbitraryValue size = frequency
[ (1, return Aeson.Null)
, (4, Aeson.Bool <$> arbitrary)
-- Note: we don't draw numbers from the whole possible range, but
-- only from the range of numbers that Lua can handle without
-- rounding errors. This is ok, as JSON doesn't define a required
-- precision, and (usually) matches the behavior of JavaScript.
, (4, Aeson.Number . luaNumberToScientific . Lua.Number <$> arbitrary)
, (4, Aeson.String <$> arbitrary)
, (2, resize (size - 1) $ Aeson.Array <$> arbitrary)
, (2, resize (size - 1) $ Aeson.Object <$> arbitrary)
]
#endif
--
-- Type for __toaeson tests
--
-- | Example type with custom JSON encoding.
data TwentyThree = TwentyThree
instance ToJSON TwentyThree where
toJSON _ = object
[ "title" .= (23 :: Int)
]
peekTwentyThree :: Peeker e TwentyThree
peekTwentyThree =
reportValueOnFailure "TwentyThree" (`Lua.fromuserdata` "TwentyThree")
pushTwentyThree :: LuaError e => Pusher e TwentyThree
pushTwentyThree _ = do
Lua.newhsuserdatauv TwentyThree 0
created <- Lua.newudmetatable "TwentyThree"
when created $ do
pushToAeson (fmap Aeson.toJSON . peekTwentyThree)
setfield (nth 2) "__toaeson"
setmetatable (nth 2)
|
