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{-# LANGUAGE RoleAnnotations #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE AllowAmbiguousTypes #-}
{-# LANGUAGE TemplateHaskell #-}
--------------------------------------------------------------------------------
module Xanthous.Data.EntityChar
( EntityChar(..)
, HasChar(..)
, HasStyle(..)
) where
--------------------------------------------------------------------------------
import Xanthous.Prelude hiding ((.=))
--------------------------------------------------------------------------------
import qualified Graphics.Vty.Attributes as Vty
import Test.QuickCheck
import Data.Aeson
--------------------------------------------------------------------------------
import Xanthous.Orphans ()
import Xanthous.Util.QuickCheck (GenericArbitrary(..))
--------------------------------------------------------------------------------
class HasChar s a | s -> a where
char :: Lens' s a
{-# MINIMAL char #-}
data EntityChar = EntityChar
{ _char :: Char
, _style :: Vty.Attr
}
deriving stock (Show, Eq, Generic)
deriving anyclass (NFData, CoArbitrary, Function)
deriving Arbitrary via GenericArbitrary EntityChar
makeFieldsNoPrefix ''EntityChar
instance FromJSON EntityChar where
parseJSON (String (chr :< Empty)) = pure $ EntityChar chr Vty.defAttr
parseJSON (Object o) = do
(EntityChar _char _) <- o .: "char"
_style <- o .:? "style" .!= Vty.defAttr
pure EntityChar {..}
parseJSON _ = fail "Invalid type, expected string or object"
instance ToJSON EntityChar where
toJSON (EntityChar chr styl)
| styl == Vty.defAttr = String $ chr <| Empty
| otherwise = object
[ "char" .= chr
, "style" .= styl
]
instance IsString EntityChar where
fromString [ch] = EntityChar ch Vty.defAttr
fromString _ = error "Entity char must only be a single character"
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