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Generate arbitrary constant for SomeConstant #4573

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Generate arbitrary constant for SomeConstant #4573

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Generate arbitrary constant for SomeConstant 
Previously only integer constants were generated.
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@zliu41
zliu41 committed May 2, 2022
commit 90a57593e2a0114006e19fbd5343c21430ace777
4 changes: 2 additions & 2 deletions plutus-core/plutus-core/test/Evaluation/Spec.hs
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Expand Up @@ -14,7 +14,7 @@ module Evaluation.Spec (test_evaluation) where
import PlutusCore hiding (Term)
import PlutusCore qualified as PLC
import PlutusCore.Builtin
import PlutusCore.Generators (forAllNoShow, genConstant)
import PlutusCore.Generators (forAllNoShow, genTypeable)
import PlutusCore.Generators.AST hiding (genConstant)
import PlutusCore.Pretty

Expand Down Expand Up @@ -90,7 +90,7 @@ prop_builtinsDon'tThrow bn = property $ do
TODO: currently it only generates constant terms.
-}
genArgsWellTyped :: DefaultFun -> Gen [Term]
genArgsWellTyped = genArgs (fmap mkTerm . genConstant)
genArgsWellTyped = genArgs (fmap mkTerm . genTypeable)
where
mkTerm :: forall (a :: GHC.Type). MakeKnown Term a => a -> Term
mkTerm a = case runEmitter . runExceptT $ makeKnown a of
Expand Down
119 changes: 69 additions & 50 deletions plutus-core/testlib/PlutusCore/Generators/Internal/Builtin.hs
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Expand Up @@ -2,25 +2,27 @@
{-# LANGUAGE GADTs #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeOperators #-}

module PlutusCore.Generators.Internal.Builtin (
genTypeable,
genConstant,
genInteger,
genByteString,
genText,
genData,
genI,
genB,
genList,
genMap,
genConstr,
genDataI,
genDataB,
genDataList,
genDataMap,
genDataConstr,
matchTyCon,
) where

import PlutusCore
import PlutusCore.Builtin
import PlutusCore.Data (Data (..))
import PlutusCore.Generators.AST (genTerm, runAstGen)
import PlutusCore.Generators.AST qualified as AST

import Data.ByteString qualified as BS
import Data.Int (Int64)
Expand All @@ -32,35 +34,65 @@ import Hedgehog.Gen qualified as Gen
import Hedgehog.Range qualified as Range
import Type.Reflection

genConstant :: forall a. TypeRep a -> Gen a
genConstant tr
genTypeable :: forall a. TypeRep a -> Gen a
genTypeable tr
| Just HRefl <- eqTypeRep tr (typeRep @()) = pure ()
| Just HRefl <- eqTypeRep tr (typeRep @Integer) = genInteger
| Just HRefl <- eqTypeRep tr (typeRep @Int) = fromIntegral <$> genInteger
| Just HRefl <- eqTypeRep tr (typeRep @Bool) = Gen.bool
| Just HRefl <- eqTypeRep tr (typeRep @BS.ByteString) = genByteString
| Just HRefl <- eqTypeRep tr (typeRep @Text) = genText
| Just HRefl <- eqTypeRep tr (typeRep @Data) = genData 5
| Just HRefl <- eqTypeRep tr (typeRep @Data) = genData
| Just HRefl <- eqTypeRep tr (typeRep @(Term TyName Name DefaultUni DefaultFun ())) =
runAstGen genTerm
AST.runAstGen AST.genTerm
| trPair `App` tr1 `App` tr2 <- tr
, Just HRefl <- eqTypeRep trPair (typeRep @(,)) =
(,) <$> genConstant tr1 <*> genConstant tr2
(,) <$> genTypeable tr1 <*> genTypeable tr2
| trList `App` trElem <- tr
, Just HRefl <- eqTypeRep trList (typeRep @[]) =
Gen.list (Range.linear 0 10) $ genConstant trElem
Gen.list (Range.linear 0 10) $ genTypeable trElem
| trOpaque `App` trVal `App` _ <- tr
, Just HRefl <- eqTypeRep trOpaque (typeRep @Opaque) =
Opaque <$> genConstant trVal
Opaque <$> genTypeable trVal
| trSomeConstant `App` trUni `App` _ <- tr
, Just HRefl <- eqTypeRep trUni (typeRep @DefaultUni)
, Just HRefl <- eqTypeRep trSomeConstant (typeRep @SomeConstant) =
-- In the current implementation, all type variables are instantiated
-- to `Integer` (TODO: change this).
SomeConstant . someValue <$> genInteger
SomeConstant <$> genConstant
| otherwise =
error $
"genConstant: I don't know how to generate constant of this type: " <> show tr
"genTypeable: I don't know how to generate values of this type: " <> show tr

genConstant :: Gen (Some (ValueOf DefaultUni))
genConstant = AST.simpleRecursive nonRecursive recursive
where
nonRecursive =
[ pure $ someValue ()
, someValue <$> genInteger
, someValue <$> Gen.bool
, someValue <$> genByteString
, someValue <$> genText
]
recursive = [pairGen, listGen]
pairGen = do
Some (ValueOf uni1 val1) <- genConstant
Some (ValueOf uni2 val2) <- genConstant
pure $
someValueOf
(DefaultUniApply (DefaultUniApply DefaultUniProtoPair uni1) uni2)
(val1, val2)
listGen =
let genList ::
DefaultUni `Contains` a =>
Gen a ->
Gen (Some (ValueOf DefaultUni))
genList = fmap someValue . Gen.list (Range.linear 0 10)
in Gen.choice
[ genList genInteger
, genList Gen.bool
, genList genByteString
, genList genText
, genList genData
]

-- | If the given `TypeRep`'s `TyCon` is @con@, return its type arguments.
matchTyCon :: forall con a. (Typeable con) => TypeRep a -> Maybe [SomeTypeRep]
Expand All @@ -81,36 +113,23 @@ genByteString = Gen.utf8 (Range.linear 0 100) Gen.enumBounded
genText :: Gen Text
genText = Gen.text (Range.linear 0 100) Gen.enumBounded

genData :: Int -> Gen Data
genData depth =
Gen.choice $
[genI, genB]
<> [ genRec | depth > 1, genRec <-
[ genList (depth - 1)
, genMap (depth - 1)
, genConstr (depth - 1)
]
]

genI :: Gen Data
genI = I <$> genInteger

genB :: Gen Data
genB = B <$> genByteString

genList :: Int -> Gen Data
genList depth = List <$> Gen.list (Range.linear 0 5) (genData (depth - 1))

genMap :: Int -> Gen Data
genMap depth =
Map
<$> Gen.list
(Range.linear 0 5)
((,) <$> genData (depth - 1) <*> genData (depth - 1))

genConstr :: Int -> Gen Data
genConstr depth =
Constr <$> genInteger
<*> Gen.list
(Range.linear 0 5)
(genData (depth - 1))
genData :: Gen Data
genData = AST.simpleRecursive nonRecursive recursive
where
nonRecursive = [genDataI, genDataB]
recursive = [genDataList, genDataMap, genDataConstr]

genDataI :: Gen Data
genDataI = I <$> genInteger

genDataB :: Gen Data
genDataB = B <$> genByteString

genDataList :: Gen Data
genDataList = List <$> Gen.list (Range.linear 0 5) genData

genDataMap :: Gen Data
genDataMap = Map <$> Gen.list (Range.linear 0 5) ((,) <$> genData <*> genData)

genDataConstr :: Gen Data
genDataConstr = Constr <$> genInteger <*> Gen.list (Range.linear 0 5) genData