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{-# LANGUAGE DeriveDataTypeable, ExtendedDefaultRules, EmptyDataDecls #-}
module Main where
import Text.JSON.Generic
import Data.Word
import Data.Int
data Foo = Foo { a :: Int, b :: Bool, c :: Baz } | None
deriving (Typeable, Data, Show, Eq)
data Baz = Baz Int
deriving (Typeable, Data, Show, Eq)
data Bar = Int :+: Int | Zero
deriving (Typeable, Data, Show, Eq)
newtype New a = New a
deriving (Typeable, Data, Show, Eq)
newtype Apples = Apples { noApples :: Int }
deriving (Typeable, Data, Show, Eq)
data Record = Record { x :: Int, y :: Double, z :: Float, s :: String, t :: (Bool, Int) }
deriving (Typeable, Data, Show, Eq)
rec = Record { x = 1, y = 2, z = 3.5, s = "hello", t = (True, 0) }
data Tree a = Leaf | Node (Tree a) a (Tree a)
deriving (Typeable, Data, Show, Eq)
atree = build 4
where build 0 = Leaf
build 1 = Node Leaf 100 Leaf
build n = Node (build (n-1)) n (build (n-2))
data Color = Red | Green | Blue
deriving (Typeable, Data, Show, Eq, Enum)
from (Ok x) = x
from (Error s) = error s
viaJSON :: (Data a) => a -> a
viaJSON = from . fromJSON . toJSON
testJSON :: (Data a, Eq a) => a -> Bool
testJSON x = --x == viaJSON x
x == decodeJSON (encodeJSON x)
tests = and [
testJSON (1::Integer),
testJSON (42::Int),
testJSON (100::Word8),
testJSON (-1000::Int64),
testJSON (4.2::Double),
testJSON (4.1::Float),
testJSON True,
testJSON 'q',
testJSON "Hello, World\n",
testJSON (Nothing :: Maybe Int),
testJSON (Just "aa"),
testJSON [],
testJSON [1,2,3,4],
testJSON (Left 1 :: Either Int Bool),
testJSON (Right True :: Either Int Bool),
testJSON (1,True),
testJSON (1,2,True,'a',"apa",(4.5,99)),
testJSON $ Baz 11,
testJSON $ Foo 1 True (Baz 42),
testJSON None,
testJSON $ 2 :+: 3,
testJSON Zero,
testJSON $ New (2 :+: 3),
testJSON rec,
testJSON [LT,EQ,GT],
testJSON atree,
testJSON (),
testJSON $ Apples 42,
testJSON [Red .. Blue]
]
main :: IO ()
main = if tests then return () else error "Generic test failed"
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