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authorGriffin Smith <root@gws.fyi>2019-11-29T19·33-0500
committerGriffin Smith <root@gws.fyi>2019-11-29T19·33-0500
commitf37d0f75c0b4a77c8e35192c24c6fdb6f2bc4619 (patch)
tree0af3e636f1a2dcb0a0e179895e4a41f2fab45f69 /src/Xanthous/Util/QuickCheck.hs
parent2f2e5a0b684f886a7585161d30e8cda962c7eefb (diff)
Implement saving+loading the game
Implement ToJSON and FromJSON for all of the various pieces of the game
state, and add a pair of functions saveGame/loadGame implementing a
prism to save the game as zlib-compressed JSON. To test this, there's
now Arbitrary, CoArbitrary, and Function instances for all the parts of
the game state - to get around circular imports with the concrete
entities this unfortunately is happening via orphan instances, plus an
hs-boot file to break a circular import that was just a little too hard
to remove by moving things around. Ugh.
Diffstat (limited to 'src/Xanthous/Util/QuickCheck.hs')
-rw-r--r--src/Xanthous/Util/QuickCheck.hs28
1 files changed, 28 insertions, 0 deletions
diff --git a/src/Xanthous/Util/QuickCheck.hs b/src/Xanthous/Util/QuickCheck.hs
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+++ b/src/Xanthous/Util/QuickCheck.hs
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+module Xanthous.Util.QuickCheck
+  ( FunctionShow(..)
+  , functionJSON
+  , FunctionJSON(..)
+  ) where
+--------------------------------------------------------------------------------
+import Xanthous.Prelude
+import Test.QuickCheck
+import Test.QuickCheck.Function
+import Test.QuickCheck.Instances.ByteString ()
+import Data.Aeson
+import Data.Coerce
+--------------------------------------------------------------------------------
+
+newtype FunctionShow a = FunctionShow a
+  deriving newtype (Show, Read)
+
+instance (Show a, Read a) => Function (FunctionShow a) where
+  function = functionShow
+
+functionJSON :: (ToJSON a, FromJSON a) => (a -> c) -> a :-> c
+functionJSON = functionMap encode (headEx . decode)
+
+newtype FunctionJSON a = FunctionJSON a
+  deriving newtype (ToJSON, FromJSON)
+
+instance (ToJSON a, FromJSON a) => Function (FunctionJSON a) where
+  function = functionJSON