Show instance

1 files changed, 14 insertions, 2 deletions

diff --git a/src/Data/Dependent/EnumMap/Strict/Internal.hs b/src/Data/Dependent/EnumMap/Strict/Internal.hs
index 17de2fd..1a26f1a 100644
--- a/src/Data/Dependent/EnumMap/Strict/Internal.hs
+++ b/src/Data/Dependent/EnumMap/Strict/Internal.hs
@@ -1,6 +1,7 @@
 {-# LANGUAGE ExistentialQuantification #-}
 {-# LANGUAGE PolyKinds #-}
 {-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE QuantifiedConstraints #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeFamilies #-}
 module Data.Dependent.EnumMap.Strict.Internal where
@@ -8,7 +9,9 @@ module Data.Dependent.EnumMap.Strict.Internal where
 import Data.Bifunctor (bimap)
 import Data.Dependent.Sum
 import qualified Data.IntMap.Strict as IM
+import Data.Kind (Type)
 import Data.Some
+import Text.Show (showListWith)
 import Unsafe.Coerce (unsafeCoerce)
 
 
@@ -16,6 +19,11 @@ data KV k v = forall a. KV !(Enum1Info k) !(v a)
 
 newtype DEnumMap k v = DEnumMap (IM.IntMap (KV k v))
 
+instance (Enum1 k, forall a. Show (k a), forall a. Show (v a))
+      => Show (DEnumMap (k :: kind -> Type) (v :: kind -> Type)) where
+  showsPrec d mp = showParen (d > 10) $
+    showString "DEnumMap " . showListWith (\(k :=> v) -> showsPrec 2 k . showString " :=> " . showsPrec 1 v) (toList mp)
+
 class Enum1 f where
   type Enum1Info f
   fromEnum1 :: f a -> (Int, Enum1Info f)
@@ -213,11 +221,15 @@ keys (DEnumMap m) = map (\(k, KV inf _) -> toEnum1 k inf) (IM.assocs m)
 
 -- ** Lists
 
--- toList
+toList :: Enum1 k => DEnumMap k v -> [DSum k v]
+toList = toAscList
 
 -- ** Ordered lists
 
--- toAscList
+toAscList :: Enum1 k => DEnumMap k v -> [DSum k v]
+toAscList (DEnumMap m) =
+  map (\(i, KV inf v) -> case toEnum1 i inf of Some k -> k :=> coe1 v)
+      (IM.toAscList m)
 
 toDescList :: Enum1 k => DEnumMap k v -> [DSum k v]
 toDescList (DEnumMap m) =