Add 'IsScriptWitnessInCtx'

Makes it easier to write functions that are polymorphic in the witness context.
IntersectMBO · Mar 7, 2023 · 4b7382c · 4b7382c
1 parent 2120fac
commit 4b7382c
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diff --git a/cardano-api/src/Cardano/Api.hs b/cardano-api/src/Cardano/Api.hs
@@ -369,6 +369,7 @@ module Cardano.Api (
     Witness(..),
     KeyWitnessInCtx(..),
     ScriptWitnessInCtx(..),
+    IsScriptWitnessInCtx(..),
     ScriptDatum(..),
     ScriptRedeemer,
     scriptWitnessScript,

diff --git a/cardano-api/src/Cardano/Api/Script.hs b/cardano-api/src/Cardano/Api/Script.hs
@@ -53,6 +53,7 @@ module Cardano.Api.Script (
     Witness(..),
     KeyWitnessInCtx(..),
     ScriptWitnessInCtx(..),
+    IsScriptWitnessInCtx(..),
     ScriptDatum(..),
     ScriptRedeemer,
     scriptWitnessScript,
@@ -851,6 +852,17 @@ deriving instance Show (KeyWitnessInCtx witctx)
 deriving instance Eq   (ScriptWitnessInCtx witctx)
 deriving instance Show (ScriptWitnessInCtx witctx)
 
+class IsScriptWitnessInCtx ctx where
+  scriptWitnessInCtx :: ScriptWitnessInCtx ctx
+
+instance IsScriptWitnessInCtx WitCtxTxIn where
+  scriptWitnessInCtx = ScriptWitnessForSpending
+
+instance IsScriptWitnessInCtx WitCtxMint where
+  scriptWitnessInCtx = ScriptWitnessForMinting
+
+instance IsScriptWitnessInCtx WitCtxStake where
+  scriptWitnessInCtx = ScriptWitnessForStakeAddr
 
 -- ----------------------------------------------------------------------------
 -- Script execution units