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Merge pull request #40 from input-output-hk/newhoggy/generate-protoco…
…lUpdateUTxOCostPerByte-in-genProtocolParametersUpdate-era-dependently-4 Generate fields only if they make sense for the given era
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,88 @@ | ||
| {-# LANGUAGE GADTs #-} | ||
| {-# LANGUAGE KindSignatures #-} | ||
| {-# LANGUAGE LambdaCase #-} | ||
| {-# LANGUAGE ScopedTypeVariables #-} | ||
| {-# LANGUAGE StandaloneDeriving #-} | ||
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| module Cardano.Api.Feature | ||
| ( FeatureValue (..) | ||
| , FeatureInEra(..) | ||
| , featureInShelleyBasedEra | ||
| , valueOrDefault | ||
| , asFeatureValue | ||
| , asFeatureValueInShelleyBasedEra | ||
| , isFeatureValue | ||
| ) where | ||
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| import Cardano.Api.Eras | ||
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| import Data.Kind | ||
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| -- | A class for features that are supported in some eras but not others. | ||
| class FeatureInEra (feature :: Type -> Type) where | ||
| -- | Determine the value to use for a feature in a given 'CardanoEra'. | ||
| -- Note that the negative case is the first argument, and the positive case is the second as per | ||
| -- the 'either' function convention. | ||
| featureInEra :: () | ||
| => a -- ^ Value to use if the feature is not supported in the era | ||
| -> (feature era -> a) -- ^ Function to get thealue to use if the feature is supported in the era | ||
| -> CardanoEra era -- ^ Era to check | ||
| -> a -- ^ The value to use | ||
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| -- | Determine the value to use for a feature in a given 'ShelleyBasedEra'. | ||
| featureInShelleyBasedEra :: () | ||
| => FeatureInEra feature | ||
| => a | ||
| -> (feature era -> a) | ||
| -> ShelleyBasedEra era | ||
| -> a | ||
| featureInShelleyBasedEra no yes = featureInEra no yes . shelleyBasedToCardanoEra | ||
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| -- | A value of type @'FeatureValue' feature era a@ is either: | ||
| data FeatureValue feature era a where | ||
| -- | A value is available for this feature in this era | ||
| FeatureValue | ||
| :: feature era | ||
| -- ^ The witness that the feature is supported in this era | ||
| -> a | ||
| -- ^ The value to use | ||
| -> FeatureValue feature era a | ||
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| -- | No value is available for this feature in this era | ||
| NoFeatureValue | ||
| :: FeatureValue feature era a | ||
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| deriving instance (Eq a, Eq (feature era)) => Eq (FeatureValue feature era a) | ||
| deriving instance (Show a, Show (feature era)) => Show (FeatureValue feature era a) | ||
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| -- | Determine if a value is defined. | ||
| -- | ||
| -- If the value is not defined, it could be because the feature is not supported or | ||
| -- because the feature is supported but the value is not available. | ||
| isFeatureValue :: FeatureValue feature era a -> Bool | ||
| isFeatureValue = \case | ||
| NoFeatureValue -> False | ||
| FeatureValue _ _ -> True | ||
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| -- | Get the value if it is defined, otherwise return the default value. | ||
| valueOrDefault :: a -> FeatureValue feature era a -> a | ||
| valueOrDefault defaultValue = \case | ||
| NoFeatureValue -> defaultValue | ||
| FeatureValue _ a -> a | ||
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| -- | Attempt to construct a 'FeatureValue' from a value and era. | ||
| -- If the feature is not supported in the era, then 'NoFeatureValue' is returned. | ||
| asFeatureValue :: () | ||
| => FeatureInEra feature | ||
| => a | ||
| -> CardanoEra era | ||
| -> FeatureValue feature era a | ||
| asFeatureValue value = featureInEra NoFeatureValue (`FeatureValue` value) | ||
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| -- | Attempt to construct a 'FeatureValue' from a value and a shelley-based-era. | ||
| asFeatureValueInShelleyBasedEra :: () | ||
| => FeatureInEra feature | ||
| => a | ||
| -> ShelleyBasedEra era | ||
| -> FeatureValue feature era a | ||
| asFeatureValueInShelleyBasedEra value = asFeatureValue value . shelleyBasedToCardanoEra |
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